Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/machines11080795

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<p>In this work, we have incorporated an electronic travel aid (ETA) as a smartphone application that alerts fall risks to the visually impaired. The application detects negative obstacles, such as platform edges and stairs, and occlusion using a grid map including height information to estimate fall risk based on the distance from an area’s edge to the user, and the area ratio. Here, we describe a grid map correction method based on the surrounding conditions of each cell to avoid area misclassification. The smartphone application incorporating this correction method was verified in environments similar to station platforms by evaluating its usefulness, robustness against environmental changes, and stability as a smartphone application. The verification results showed that the correction method is, in fact, useful in actual environments and can be implemented as a smartphone application.</p>

DOI： 10.20965/jrm.2023.p0867

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Language：English   Publishing type：Research paper (international conference proceedings)

2023.03.26  -  2023.03.29

DOI： 10.23919/EuCAP57121.2023.10133725

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2023.03.06  -  2023.03.09

DOI： 10.1109/UT49729.2023.10103416

DOI： 10.1109/UT49729.2023.10103416

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2023.03.06  -  2023.03.09

DOI： 10.1109/UT49729.2023.10103413

DOI： 10.1109/UT49729.2023.10103413

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In food industry, shortage of workers is one of a serious problem. Automation of food handling is a critical nowadays. To alleviate the damage caused by food picking operation by robotic hand, we propose non-contact acoustic impedance estimation with ultrasonic wave, which should be preceded before the picking for optimization of grasp stiffness. We assume the correlation between hardness and acoustic impedance. That is, the harder the medium is, the larger the impedance should be. As cooked food, the unevenness of hardness should be considered. We made samples with media of different acoustic impedances, and experimented with ultrasonic to find the relation between reflection coefficient and hardness. As the result, reflection coefficient increased by 0.03-0.15 at the boundary of two media as the bottom medium is switched from urethane to Aluminum.

DOI： 10.57417/jrnal.9.4_343

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We have developed a fall risk alert system using a smartphone with a LiDAR sensor, Apple’s iPhone 12 Pro, as an electronic travel aid (ETA) for visually impaired to reduce fall risks from the edge of station platform and the stairs. The proposed system generates the height grid map generated from 3D point clouds and posture from the smartphone, and classify the walking area to four areas, walkable, positive obstacle, negative obstacle and occlusion areas. In this paper, we describe the algorithm and the experimental results of the environmental recognition system for the fall risk alert. In the experiments, the accuracy, stability, and time delay are evaluat-ed in approaching a fall risk area, such as stairs. The results show the smartphone has the possibility to be the ETA to support the visually impaired and reduce the fall risks.

DOI： 10.57417/jrnal.9.4_349

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RoboCup Middle-sized-League soccer robots are mainly equipped with the three omni-roller mechanism. These mobile robots are expected to function efficiently in fields, such as logistics. These systems are easy to control and allow omnidirectional movement. However, theoretical research on these systems’ exercise efficiencies has not been conducted. In this research, we assume a mechanism that can arbitrarily change the roller arrangement based on a circular mechanism and evaluate the roller arrangement from a speed efficiency perspective. Additionally, we define an evaluation function using the theory of linear transformation to examine the roller arrangement.

DOI： 10.57417/jaalr.3.4_242

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Many types of spherical robots use friction-drive systems for locomotion because such systems enable omnidirectional movement and are more capable of climbing steps than mobile robots equipped with multiple omni-wheels. Slipping between spheres and rollers is a remarkable issue with friction-driven mechanisms. However, the previously established sphere kinematic models do not consider slipping, and kinematic models consider slipping in only two constraint rollers. In this study, we propose a mathematical model that allows for slipping on three constraint rollers and simulate the angular velocity vector of the sphere and slip speed at each contact point.

DOI： 10.5954/icarob.2023.os20-6

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Autonomous Underwater Vehicles (AUVs) require long-distance communication, especially in the deep sea. Radiofrequency (RF) communication provides a high data rate. However, electromagnetic wave is seriously limited by high attenuation in the water medium. In this study, we investigate Radiofrequency communication in seawater. The experiment results show the effects of the distance between the transmitter and receiver, and the stability of the antennas. We achieved HD video transmission with 25fps.

DOI： 10.5954/icarob.2023.os21-1

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Light scattering from suspended particles and attenuation over the water column are constant phenomena that reduce underwater image quality due to low contrast and color distortion. Common image restoration techniques such as the image formation model, assumes a constant attenuation coefficient across color channels. This results in a restoration solution with limited application. We propose a method of image restoration that considers the wavelength-dependent attenuation of underwater images by providing concurrent measurements of the coefficient of attenuation for each color channel. In this paper, a description of the design of a turbidity meter is made. It used to extract absorbance of light in the RGB channel. We conduct experiments to validate the operation of the turbidity meter based on BeerLamberts law.

DOI： 10.5954/icarob.2023.os21-3

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DOI： 10.5954/ICAROB.2023.OS20-7

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Tomato is one of the important fruit vegetables and most tomatoes are produced in the greenhouses, or large-scale farms, where the high temperature and humidity, and long harvest age force the farmer heavy works. To develop the tomato harvesting robot, many research issues exist such as manipulator design, end-effector design, collaborative behavior, artificial intelligence, motor control, image processing, target recognition and so on. With an aim to promote the automation of tomato harvesting, we have organized the tomato harvesting robot competition since 2014, and currently changed the competition field to the greenhouse in 2020. In this paper, we discuss the results of 8th tomato harvesting robot competition in 2021.

DOI： 10.5954/icarob.2023.os20-5

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Crops are required to be processed in sanitary manner for lunchbox production in industries. Particularly, foreign object detection is crucial to guarantee consumer's health. Actually, foreign objects are mainly detected by human's eyes. For the automation, image processing is an example, however, is not effective for hidden objects. We propose a method of foreign object detection with ultrasonic reflection analysis. In our experiment, we selected four crops (lettuce, spinach, perilla and komatsuna) for masking material, and a coin for occluded objects. The coin were attached on the backside of the masking material. We recorded reflected wave moving the material linearly. As the result, reflection intensity doubled by the existence of occuluded object.

DOI： 10.5954/icarob.2023.os21-5

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An International underwater robot competition, "RoboSub" is held in USA to demonstrate robot's autonomy by completing underwater tasks, with a new theme each year. Student project team, "Kyutech Underwater robotics" developed autonomous underwater vehicle (AUV) "KYUBIC" with built-in image processing module for the RoboSub. Sensors on the AUV are connected via ethernet and its automatic navigation program is built using ROS. The AUV moves through gate to the target objects based on self-localization using doppler velocity log and IMU. When approaching the object, the AUV aligns its direction to the object based on the red line detection by image processing as well as the type, position, and altitude of the target objects are detected by deep learning on the image processing module.

DOI： 10.5954/icarob.2023.os20-2

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A mechanical variable stiffness can adapt to external forces beyond the control cycle, such as overturning of walking robots, which can help solve problems such as actuator and joint destruction. In this research, we will clarify the structure of a two-input, one-output joint mechanism that can realize three functions: normal motion, instantaneous motion, and variable stiffness function. As part of the development of the variable stiffness function, a mathematical model is derived and simulated for the relationship between the joint angle of the output link and the disturbance torque when a disturbance torque is applied to the output link of the proposed mechanism.

DOI： 10.5954/icarob.2023.os21-6

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The 9th Tomato Harvesting Robot Competition was held at the green house in Kitakyushu Science and Research Park. The competition consisted of two leagues for different field areas: rail-style for greenhouses and free-style for open fields. Our team competed in the free-style league. Participation in the free-style category required the following: tomato harvesting mechanism; mobility mechanism to move on the rough terrain; camera to photograph tomato; and self-location system. We developed a 3-axis cartesian coordinates manipulator tomato harvesting robot using crawler to move on soil and using suction and cutting to harvest the tomatoes. In this paper, we described the system architecture of tomato harvesting robot and the results of 9th Tomato Harvesting Robot Competition in 2022.

DOI： 10.5954/icarob.2023.os20-4

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DOI： 10.5954/icarob.2023.os21-4

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The use of agricultural machinery damages the soil by compaction and distortion, where the compaction is due especially to vehicle with small contact areas like wheels, while the distortion is caused especially by tracked systems. In this work we discuss a wheel/track reconfigurable robot able to adjust the contact area based on the soil conditions, to minimize soil damage, energy consumption and adapt travers ability. After giving an overview, we propose a control strategy for switching between the locomotion modes.

DOI： 10.5954/icarob.2023.os21-2

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Underwater Communication is one of the most difficult challenges facing researchers. OFDM technique has been used widely in 4G communication systems, and recently it was approved to be successfully implemented in 5G. Many researchers have improved the Underwater wireless communication system including Acoustic communication using the OFDM technique. We applied the Cyclic Prefix in this study to improve the underwater communication system. We started by studying the effects of Rician fading based on the OFDM system on the wireless channel. Then we analyzed the Bit Error Rate (BER) of the system in several scenarios, by applying the AWGN, Rician fading, and absorption factor to simulate the underwater channel.

DOI： 10.5954/icarob.2023.os21-7

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Due to the social background of declining birthrates and an aging society, object transport requires automation and the introduction of robots. This study focuses on sphere transport as a means of efficient object transport by robots. This paper uses a spherical motion measurement system to evaluate the forward kinematics of sphere transportation. The results show the validity of roller-sphere forward kinematics in three patterns of roller arrangement.</p>

DOI： 10.1299/jsmermd.2023.1a2-h21

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DOI： 10.1109/UR57808.2023.10202299

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Degradation in underwater imaging is as a result of absorption and scattering of light. Propagated
visible light rays through the water column are absorbed at rates that vary depending on the
wavelength of light. Large suspended particles also scatter the propagated light rays, as can be
observed in an underwater environment. Furthermore, color is distorted due to the inverse ratio
of attenuation that is proportional to the wavelength of light through a unit of length through the
water column. These phenomena distort underwater images by making them appear dark and have
low contrast. Conventional underwater image restoration techniques are largely based on the
image formation model (IMF) which restores the image based on estimates from the degraded
images. The results are solutions that are limited to specific underwater conditions. In this paper,
we propose a novel restoration strategy by considering the optical properties in the underwater
environment at the time of image capture, a robust restoration technique can be applied to images
captured in different underwater conditions. In so doing, we design a turbidity meter that capture
wavelength-dependent absorption data which are applied as parameters to restore the distorted
images based on the RGB channels. To validate our proposed technique, we conduct experiments
in a controlled underwater environment while varying the concentration of suspended particles
based on degree of kaolin mixture.

DOI： 10.57417/jrnal.10.2_141

CiNii Research

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)

A marine-cleaning robot competition was featured at the junior division of the Eighth Underwater Robot Festival held at Iwakuni, Japan in 2022. The theme of the competition was “Life Below Water,” which is the 14th goal of SDGs, and consisted of poster presentations on marine-debris problems and a robot competition to compete in debris-collection ability. In addition, questionnaires were sent out before and after the competition to analyze the level of understanding of robot development and SDGs after the competition. This paper reports an outline of the junior division and results of the educational effect using questionnaire analysis.

DOI： 10.57417/jrnal.10.1_77

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Compared to mobile robots equipped with multiple rollers, spherical robots can move in all directions and are superior in durability and in their ability to climb steps. Slippage between balls and rollers is a significant problem in friction drives. However, previously established roller-driven ball kinematics model considers sliding on only two constraining rollers. In this research, we developed it, proposed a motion model of sphere with three-constraint rollers, and developed a mathematical model that simulates the angular velocity vector of the sphere and the slip vector at each contact point. And we considered the existence of an angular velocity vector of sphere adapted three constraint rollers from the viewpoint of forward kinematics and succeed demonstration of the trajectory of the endpoint of the angular velocity vector and slip velocity vector of sphere.

DOI： 10.57417/jrnal.10.1_25

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Autonomous Underwater Vehicles (AUVs) require long-distance communication, especially in the deep sea. Acoustics communication and wireless optical communication have limitations of low latency and water conditions effects respectively. Radiofrequency (RF) communication provides a high data rate with free orientation of the transmitter/receiver antennas. However, electromagnetic waves are highly restricted by high attenuation over short distances in the underwater medium. In this study, we investigated the RF communication in a tank full of seawater. A loop antenna and rectangular antenna were used for the base station and AUV respectively. The experiments were conducted to measure the transmission rate with different distances between the base station and the AUV using both User Datagram Protocol (UDP) and Transmission Control Protocol (TCP). Live video streaming with framerate analysis was considered. The results show the effect of the distance between the transmitter and receiver on the transmission rate, in addition, to the antenna's stability has huge effects on the connection stability. We successfully achieved a High-Definition (HD) video streaming with 25fps for over 1 meter.

DOI： 10.57417/jrnal.10.1_84

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Recently, Autonomous Underwater Vehicles: AUVs are utilized as the tools for ocean survey and practical applications such as ocean mineral resources survey and marine biological investigations. We have developed an AUV “Tuna-Sand2” and have succeeded in automatic sampling of shells in sea trials at Suruga Bay in Japan. Tuna-Sand2 is designed for 2000m depth and 8 hours operation with the speed of 1 knot and has several computers for basic motion control with sensor handling, intelligent behaviors based on image processing and data transmission, however, the robot needs efforts in deployment and recovery because of weight and sizes, and must return to the surface in emergency conditions. That is, the system should be stable, reliable and conservative, and not suitable for testing new challenging algorithms and behaviors. We have developed a new AUV KYUBIC which can be operated by a few people as a small testbed of Tuna-Sand2 and have similar shape and thruster arrangement. In this paper, we describe the system architecture of KYUBIC and the experimental results in Underwater Robotics Competition in Okinawa 2020.

DOI： 10.57417/jrnal.10.1_6

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Underwater communications research is significant to researchers because of the challenges and
difficulties in transmitting wireless signals within this environment. Underwater Acoustic
Communications (UWA) are characterized by the fact that they can travel long distances
compared to the radio signal, which makes it very effective compared to other types, in addition
to the lack of costs in establishing these types of systems. OFDM technique has been used widely
in 4G communication systems, and recently it was approved to be successfully implemented in
5G. One of the most important aims of developing communications systems is to reduce the bit
error rate (BER), and since the underwater communication signal is subject to many influencing
factors that reduce the accuracy of the signal when it reaches the receiver, such as absorption and
multipathing, researchers must improve the performance of the OFDM system by removing this
effect. The channel effect is reduced by selecting some subcarriers from the OFDM system and
assigning them as pilots. These Pilots are given higher power to determine the channel effect and
then use the appropriate equalizer to reduce the effect and improve signal accuracy. In this study
we tested the appropriate number of pilots to estimate the channel response, with a linear equalizer
to reduce the effect at the receiver, then compared the BER before and after adding the equalizer.

DOI： 10.57417/jrnal.10.2_160

CiNii Research

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.20965/jrm.2023.p1385

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Accurate localization of Autonomous Underwater Vehicles (AUVs) is fundamental to navigation
accuracy, and robust control which leads to an overall success of vehicles’ mission. Conventional
positioning systems are expensive and cannot be implemented for lightweight/budget AUV
systems. This paper describes the design and performance of an inexpensive acoustic positioning
system (APS) used to guide the mission strategy of a lightweight AUV (KYUBIC) for the
Underwater Robotics Competition in Okinawa. Using Position and Thrust control strategy, the
AUV velocity is used for self-positioning estimation, and this is calculated from the equation of
motion without integrating the acceleration. The acoustic positioning method is based on Supershort
baseline (SSBL) principle comprising of 2 self-made hydrophone module using MEMS
microphone. Our competition strategy searches and locates the position of a submerged Pinger
using detection and angle estimates that are integrated for dynamic control of the AUV.
Performance analysis show that the controller and low-cost acoustic system can search and
localize at Pinger position within the accepted boundary.

DOI： 10.57417/jrnal.10.2_131

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DOI： 10.23919/OCEANS52994.2023.10337342

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<p>To obtain a long-term data of marine resources which are distributed over a wide area of the deep sea, we have been developed a long-term observation system using cable-restricted underwater vehicle. This paper reports about long-term observation system and its wet test performed at 3 m depth. As an evaluation experiment result, the vehicle tethered by a cable was able to cruise with an error of less than 0.34 m against the planned route. The mosaic image generated based on the captured images was able to measure the width, length, and height of the object with an error of less than 4 cm.</p>

DOI： 10.1299/jsmermd.2023.1p1-c12

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<p>The oceans occupy about 70% of the Earth ’s surface have vast space and mineral, energy, and biological resources. In recent years, AUV has been developed for resource surveys in various sea areas We are working on developing and implementing a robust control system to improve the AUV autonomy and to navigate safely. This paper reports about observation results by hovelling type AUV ”Tuna-Sand2” on seaweed bed habitat off Iwakuni on January 2023 and estimate currents from the dive data to design the observer to estimate currents and implement for AUV. The dive results show that there were Northwesterly current and AUV position is easily affected by current when change target direction.</p>

DOI： 10.1299/jsmermd.2023.1a2-c09

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<p>Robot social implementation is expected nowadays, and in particular, for autonomous mobile robots, it is becoming necessary to be able to ”collaborate with others (other robots).” When dealing with such multi-agent systems (MAS), framework sharing has the effect of reducing the burden on designers and improving compatibility and code reuse between agents. In particular, RoboCup is a landmark project that includes the goal of accelerating development and research speed through the sharing of technology and knowledge among teams in competitions. Therefore, in order for engineering applications using MAS to progress to practical stages, a framework that supports the design, implementation, evaluation, and improvement of MAS must be available. This study aims to propose and implement a framework for the RoboCup middle-size league. ROS2 and its network were utilized for implementation, and a proposal including system configuration was made.</p>

DOI： 10.1299/jsmermd.2023.2a1-b13

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<p>Efficient transportation of objects by robots is required due to the declining working-age population. This study focuses on sphere transport as a means of efficient object transport by robots. To date, there is no methodology for mechanism design based on kinematics properties for sphere transport by robots. Therefore, we propose a method for designing a sphere transport mechanism based on kinematic properties. The paper presents the requirements and methodology for designing a sphere transport mechanism based on kinematic properties.</p>

DOI： 10.1299/jsmermd.2023.1a1-h21

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/SCISISIS55246.2022.10001945

DOI： 10.1109/SCISISIS55246.2022.10001945

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DOI： 10.3390/machines10121117

DOI： 10.3390/machines10121117

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Improving the efficiency of fish feeding contributes to achieving sustainable expansion of the aquaculture industry. However, expert knowledge on feeding remains reliant on experience. This paper presents a new approach of applying digital transformation (DX) on such knowledge by measuring underwater currents induced by fishes as indicator of their hunger. A prototype sensor suite consisting of current sensors, cameras, and an inertial measurement unit (IMU) was constructed to measure the currents around the fish cage, measure the motion of the suite, and record fish activity, particularly during feeding. An initial experiment was performed in two fish cages during feeding activity. Current measurements were collected and analyzed together with the recorded videos to relate the changes in current to the feeding activities. Results suggest that the currents increase around when feeding was started continuously and decline to zero around when it was stopped. However, more data needs to be collected and analyzed for a better understanding of the relationship between the changes in current and fish activities so it can be used to optimize the feeding decisions of fish farmers.

DOI： 10.57417/jrnal.9.2_143

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Previous spherical mobile robots were driven by two rollers with a fixed rotational axis, which restricts the angular velocity vector of the sphere to two dimensions. Three-dimensional freedom is expected to improve the rotational diversity of the sphere. This study proposes a spherical mobile robot with a variable roller-rotational axis that allows the movement of three degrees of freedom. Furthermore, the kinetic energy of transporting the sphere by the rollers is minimized by an optimization procedure and it is shown that the kinetic energy of sphere transport is efficient.

DOI： 10.57417/jrnal.9.1_87

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

Agriculture is one of the most important primary industries, however the agricultural workforce in Japan has been decreasing due to the aging, shortage of successors and their heavy work. Smart agriculture and farms, which aim to automate farm work, have been attracting attention for the future sustainable society. We have been organizing the Tomato-Harvesting-Robot Competitions since 2014 to introduce robotic technology and AI into agriculture and promote agricultural technology. The competition consists of a Junior League for young students and a Senior League for general competitors. In this paper, we report the results of the 6th Tomato-Harvesting-Robot Competition and the regulation changes toward practical applications.

DOI： 10.57417/jrnal.9.1_13

Scopus

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85178282719&origin=inward

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

Underwater robot competitions provide students with the opportunity to voluntarily learn engineering knowledge and skills. It is expected that students will be interested in the marine engineering and manufacturing by participating in such underwater robot competitions, and that interest will lead to motivation for university learning. In this study, we will conduct extracurricular activities for 8 students for about half a year with the aim of participating in underwater robot competitions, and evaluate their educational effectiveness. In the evaluation, changes in interest in the marine engineering and manufacturing were evaluated by questionnaire. In addition, changes in learning motivation were evaluated from the university GPA from 2018 to 2020. As a result, it was confirmed that the participating students were interested in the marine engineering and manufacturing through extracurricular activities and maintained high learning motivation.

DOI： 10.4307/jsee.70.2_124

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsee/70/2/70_2_124/_pdf

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Autonomous Underwater Vehicle positioning is important for accurate control and high-quality data collection. Conventional positioning systems are expensive. This paper describes the design and performance results of control using equations of motion and an inexpensive acoustic positioning system implemented on a lightweight AUV "KYUBIC" for Underwater Robotic competition in Okinawa 2021. The velocity used to estimate the self-position of the AUV is calculated form the equation of motion without integrating the acceleration. The acoustic positioning method is based on Super-short baseline (SSBL) principle. The system design comprises of self-made hydrophone module using MEMS microphone. The estimated distance and angle are integrated for dynamic control of AUV to locate the position of a Pinger.

DOI： 10.5954/icarob.2022.os28-1

DOI： 10.5954/icarob.2022.os28-1

Kyutacar

CiNii Article

CiNii Research

Other Link： https://kyutech.repo.nii.ac.jp/records/7484

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2022.01.22  -  2022.01.24

Kyutacar

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Acoustic communication has a lot of influence of noises, and difficulties in sending and receiving data correctly because of the noise from robot's thrusters and other acoustic devices. To improve the acoustic communication performance, this research developed acoustic communication system against the thruster's noise. Communication message includes not only data (payloads) but also sync signal and error correction bytes, and the message is converted to acoustic wave by QPSK modulation which four phase data represent two bits.

DOI： 10.5954/icarob.2022.os29-3

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Optimization of fish feeding in marine aquaculture has relied on an expert farmer's decision-making based on subjective experience. This paper presents the development of a network of underwater current, imaging and IMU sensors for estimating fish feeding behavior for digitizing expert feeding decision-making. We constructed the sensor units and deployed them in fish cages and collected measurements during feeding activities. Experiment results indicate that currents were highest at the surface within the duration of the feeding activity.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os29-1

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008703

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

The actual situation of marine litter has not been measured accurately; however innumerable floating garbage are drifting in the ocean. Especially, non-perishable waste such as microplastics continues to grow and is damaging marine life, including endangered species, and some are washed ashore and causing pollution damage to coastal areas. Microplastics incorporated into marine organisms, Arctic Sea ice, and deep-sea seafloor sediments have also been detected. The Ellen MacArthur Foundation in the United Kingdom estimates that the total amount of marine debris exceeds 150 million tons, with more than 8 million tons of new inflow each year. We measured and compared the amount of ocean debris in coasts in Hirado and Matsuura cities, Nagasaki with manual count and an aerial drone observation.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os27-5

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008702

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

The underwater robot competition in international conference Techno-Ocean 2021 was held to advance underwater technology, in Dec. 2021. The competition consists of five leagues including AUV (Autonomous Underwater Vehicle) league, and Kyushu underwater robotics which is the Underwater Student Project team at our university that joint the AUV league using developed AUV. The wet test of the AUV league includes a Gate Pass mission which requires passing through an underwater green gate, Buoy Touch mission requiring contact with the yellow and red buoys, and Special mission requiring contact with the Pinger which has an unknown location. Our AUV navigates by image processing using underwater camera to achieve the mission. This paper explains the AUV system, the mission strategy and detail of image processing.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os28-2

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008693

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

As crops in greenhouses are widely distributed, IoT devices placed near the crops should be stand-alone and modular, and data from the devices are collected over the networks. Smart agriculture requires knowledge of a wide range of fields including electricity, information, and image processing. We have designed an AI and IoT technology exercise on environmental monitoring and control of a greenhouse where we have been preparing for grow up of tomatoes and other vegetables.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os28-5

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008696

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

We have developed the fall risk notification system using LiDAR sensors to reduce number of fall accidents on platform involving visually impaired people. In this paper, we report the experiment results of the environment recognition algorithm for the fall risk notification system. In this algorithm, height grid map is generated from the depth image from LiDAR sensor and the posture of iPhone. In the experiment, we evaluated the accuracy and responsivity when approaching risky area of falling, such as stairs.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os27-2

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008692

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

In robotics, the problems and solutions to be focused on may differ due to the different fields of robots to be developed. In this research, we will verify the effect of exchanging opinions and sharing knowledge by collaborating with students aiming to participate in different robot competitions between underwater robots and soccer robots. As a result of analysis using neural networks, it was found that collaborative research between universities contributes to maintaining student motivation.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os28-4

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008695

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

As the fuel cost will rise continuously, the reduction of fuel consumption and CO2 emissions are required more severely in the transportation industry. To achieve more efficient ship transportation, the prevention of marine biofouling is inevitable. Anti-fouling paint is effective to prevent biofouling to the ship hulls like barnacles, however, even the painted hull acquires slime-like biofouling caused by marine alga on its surface easily. In general, the cleaning of the ship hull is carried out during inspection in dockyard once a year or by divers, which are high costs and high risk task. Frequent cleaning during the ship berthing is desirable to keep good fuel efficiency, and if possible, ships can keep good fuel efficiency that contributes the reduction of costs and CO2 production. As a solution for this issue, we have been introducing underwater robots for ship hull cleaning. In this paper, the motion control system of the robot is described.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os29-5

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008701

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

In food industry, shortage of workers is one of a serious problem. Automation of food handling is a critical isSsue nowadays. To alleviate the damage caused by food picking operation by robotic hand, we propose non-contact acoustic impedance estimation with ultrasonic wave, which should be preceded before the picking for optimization of grasp stiffness. We have the assumption of the correlation between hardness and acoustic impedance. The impedance is calculated by the product of sonic velocity and density of a medium. From the point of view, the harder the medium is, the larger the impedance should be. We built up ultrasonic transmission model considering attenuation by ultrasonic reflection and absorption, then, made an experiment to estimate internal reflection of samples with two overwrapped media of different acoustic impedance.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os27-3

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008698

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Tomato is one of the important fruit vegetables and most tomatoes are produced in the greenhouses, or large-scale farms, where the high temperature and humidity, and long harvest age force the farmer heavy works. To develop the tomato harvesting robot, many research issues exist such as manipulator design, end-effector design, collaborative behavior, artificial intelligence, motor control, image processing, target recognition and so on. For the operation in greenhouses, the recognition system with color constancy under sunlight is necessary. In the harvesting, tomatoes should be handled gently for less damages so that the soft handling end-effector is needed. In this paper, we introduce the system configuration of the robot and the experiments conducted to solve the problem in the greenhouse.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os28-3

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008694

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Fuel consumption of the ship gets worse by barnacles and stains put on its bottom, so that the ship hull should be cleaned regularly. Usual methods such as cleaning by special divers and cleaning after pulling up to the dock are not used frequently due to those high cost and the heavy burden on cleaners. We proposed a cleaning method using underwater vehicle with brushes, however there is a possibility to remove paints on the hull. To improve cleaning performance of the underwater vehicle, the ultrasonic cleaner is developed by using cavitation occurred by sound waves of the acoustic transduces. The cleaner generates sound waves with sound pressure of 0.2MPa or more required to occur cavitation at the point where sound waves from two transducers overlap. In experimental results, the cleaner occurred cavitation enough to make two holes in the aluminum foil located 50mm away from transducers.The 2022 International Conference on Artificial Life and Robotics (ICAROB 2022), January 20-23, 2022, on line, Oita, Japan

DOI： 10.5954/icarob.2022.os29-4

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008700

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125144710&origin=inward

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

<p>Currently, underwater infrastructure facilities in Japan are rapidly aging, but most of them are not inspected by divers because the current inspection by divers is inefficient and potentially dangerous. To realize a system that can inspect underwater infrastructures safely and efficiently, this study develops a motion control system for an underwater robot that is part of the underwater infrastructure inspection system.</p>

DOI： 10.1299/jsmermd.2022.2a2-a11

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2022/0/2022_2A2-A11/_pdf

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

<p>In agriculture, the aging and depopulation of farmers cause the shortages of farmers and manpower. Most of commercialized robots are industrial robots for factory automation, and most of robots for the first industry, agriculture, forestry and fisheries are still under developing. The reasons are cost-efficiency of the robotization, safety of the works using robots, difficulty of outdoor operations, and knowledge transfer problem from farmers to computer, etc. As one of solutions for the problems, robot technology into the agriculture is expected to contribute to the laborsaving, improvement of production, production line automation, and also the management toward smart-agriculture. We organize the Tomato-harvesting-robot competition to offer the research field and welcome researchers into agricultural robotics.</p>

DOI： 10.1299/jsmermd.2022.2p2-t08

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2022/0/2022_2P2-T08/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

<p>The ocean is one of extreme environments, and underwater robots are expected as the tools for observation of the ocean. Underwater robots require high autonomy and are self-contained to accomplish various deep-ocean observation missions. The next generation AUV is expected to have sampling function of marine benthos with end-effector to catch and bring back marine creatures. However, sampling is not easy task for AUV as the shape, size, motion of targets differs. So that the end-effectors is required to have enough accuracy in control manipulation. One of the key issues is the target recognition from underwater images. In this research, floating objects cancellation method from underwater images using optical flow is discussed.</p>

DOI： 10.1299/jsmermd.2022.2a2-a10

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2022/0/2022_2A2-A10/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

<p>As crops in greenhouses are widely distributed, IoT devices placed near the crops should be stand-alone and modular, and data from the devices are collected over the networks. Smart agriculture requires knowledge of a wide range of fields including electricity, information, and image processing. We have designed an exercise on environmental monitoring and control of a greenhouse toward smart agriculture. The exercise consists of mechatronics, MATLAB/Simulink and system construction exercises. Students learns technology electrical circuit, embedded programing, network communication, and image processing required for smart agriculture. Almost students who took the exercise acquired technology related to micro-computers, image processing technology and control by MATLAB/Simulink, but a few students couldn’t acquire them. In the next school year, authors plan to teach from a little more basic technology.</p>

DOI： 10.1299/jsmermd.2022.2p2-s12

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2022/0/2022_2P2-S12/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

<p>For omni wheels used for omnidirectional movement of soccer robots, the shape and number of small wheels affect driving stability and grip. In this research, we will realize the production of small wheels, which was difficult to manufacture by ourselves due to the history of using resin materials, by using a manual tabletop injection molding machine. By eliminating the bearings that have been used so far, we aimed for a more robust wheel. We designed a mold for injection molding and actually manufactured it．We verified the manufacturing method by injection molding with multiple types of resin materials using the manufactured mold．This research makes it possible to propose new small wheel shapes and materials .</p>

DOI： 10.1299/jsmermd.2022.2p2-t04

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2022/0/2022_2P2-T04/_pdf

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

A driving roller arrangement of hemisphere is one of the important problems by omnidirectional sphere conveyance. In this research, the roller arrangement problem, viewed as an evaluation function, is thought of as mean of roller’s kinetic energy with respect to the sphere direction. Furthermore, theoretically, we calculate the evaluation function, and find the contact point such that the evaluated value is minimal.

DOI： 10.57417/jrnal.9.3_233

Scopus

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85176580752&origin=inward

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (other academic)

<p>The use of heavy machinery in agriculture has led to a progressive soil degradation and the consequent crop yield reduction and increase of maintenance costs. The soil damage is of two types: soil compaction (volume reduction) and distortion (shearing and deformation). Because this damage is affected by the state of the soil and by the contact area between soil and running gear, the design of a vehicle able to change its contact area is here considered. The vehicle is intended to transport the grape in the vineyards and replace the use of heavy tractors during the harvesting period. The proposed system can pass from a wheeled vehicle, suited for hard dry soil, to a half-tracked vehicle, suited for more soft and deformable soil. In this work, we provide the overview of the entire vehicle, and we show the design of the mechanism for switching between the two types of locomotion systems.</p>

DOI： 10.1299/jsmermd.2022.1p1-a12

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2022/0/2022_1P1-A12/_pdf

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (other academic)

<p>Optimizing fish feeding is needed for a sustainable marine aquaculture production. We approach this problem by estimating the behavior of fishes during feeding by measuring currents they generate around the cage. In this paper, we present our development of an underwater sensor network consisting of current sensors, inertial measurement units, and cameras. This system was deployed in a fish cage and recorded measurements in three fish cages during feeding activities. Results showed that currents generated by fishes were largest at the surface during feeding and decline over time until the feeding ended. Further data analysis is needed for optimizing the farmer’s feeding decisions.</p>

DOI： 10.1299/jsmermd.2022.2a2-a12

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2022/0/2022_2A2-A12/_pdf

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125147658&origin=inward

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125146847&origin=inward

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125151724&origin=inward

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125145633&origin=inward

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125133575&origin=inward

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125149261&origin=inward

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

2021.12.07  -  2021.12.08

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/logistics5040076

Kyutacar

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.jterra.2021.06.004

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

Kyutacar

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Marine resource survey by an underwater vehicle is expected. To realize cheap self-positioning for the underwater vehicle, we have been developing on the acoustic positioning system which is low cost and easy to maintain. The acoustic positioning system has four hydrophones which consists of molding commercially available MEMS micro phones with pressure-resistant resin, an audio device, and a micro controller. To evaluate the system, positioning experiments was performed in the small tank. In the experiments, the system detected delay time among four hydrophones, however its positioning was not good accuracy. In the future, we will improve the accuracy of positioning by interpolating data and considering the effect of baseline.</p>

DOI： 10.1299/jsmermd.2021.1A1-B01

Kyutacar

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130008134856

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In this paper, in order to evaluate the plane detection algorithm for detecting the edge of a station platform, we verified the algorithm by running it on the 3D distance data measured at the actual station platform. As the result, we were able to detect the plane with the error that is small enough to distinguish it from steps such as stairs. However, the correct answer rate and the true negative rate were greatly reduced by the distant point clouds and the movement of the sensor itself, so it is necessary to remove the distant point clouds and to reduce the error caused by the movement of the sensor itself in the current algorithm. In the future, we will verify the algorithm in other situations, and implement and verify additional processing.</p>

DOI： 10.1299/jsmermd.2021.1P1-F11

Kyutacar

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130008134919

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>This paper presents an estimation method of total harvesting time using the tomato harvesting robot developed in this study. In this robot, the occlusion ratio of obstacles to the target tomato is one of the factors for harvestability. The occlusion ratio was quantified, and the criteria for tomatoes that are easy for this robot to harvest was determined based on the results of the harvesting experiment. Using the tomato growth state map, the total harvesting time was estimated from the location data of the tomatoes that can be shipped with the occlusion ratio of 0.07 or less.</p>

DOI： 10.1299/jsmermd.2021.1P2-A04

Kyutacar

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130008135064

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In the realization of symbiosis between humans and robots, how robots can understand human behavior is an important issue. In the soccer robot, it is possible to show that human-robot symbiosis in a dynamic environment is possible if humans and robots share the same understanding of behavior. In this paper, a robot in a simulator that behaves according to a certain rule is analyzed using a self-organizing map, and the rule is mapped to two dimensions as a feature map and evaluated. By using this map, a system that selects the next action from the position of each player is completed. This system can also be adapted to humans who act according to certain action decision rules.</p>

DOI： 10.1299/jsmermd.2021.1A1-K04

Kyutacar

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130008134930

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>We proposed a method for estimating the angular velocity of a rotating visual target robustly to changes in illumination conditions using event-based vision and spiking neural networks (SNNs). By using the output of the event-based vision directly as input to the SNN, the image processing function can be achieved by keeping the advantages of the vision sensor in the previous stage. A board printed with natural images was placed at a certain distance from the vision system as a viewing target. The vision system captured rotating objects at various angular velocities under multiple lighting conditions to generate a data set. Using this data set, we verified whether the SNN can estimate the visual target. We achieved about 80% accuracy on both the training and test datasets in both bright and dark lighting environments.</p>

DOI： 10.1299/jsmermd.2021.2P2-H05

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130008135692

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)

<p>Predicting fish feeding behavior is crucial in improving marine aquaculture production. We are addressing this problem using a novel approach – measuring underwater currents generated by fish, especially at feeding times. In this paper, we present our development of a suite of sensors that will collect these measurements, as we investigate their relationship with fish behavior during feeding. We added we have further developed our sensor suite by adding another current sensor for calibrating the previously developed propeller sensors and tested them along a narrow river to examine the relationship of their measurements. While a strong linear relationship was observed between the measurements, it is difficult for the propeller sensors to measure currents accurately at slower currents. Experiment at the fish farm is still needed to determine if this constraint is acceptable in our application.</p>

DOI： 10.1299/jsmermd.2021.1P1-B17

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130008134963

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

2021.03.14  -  2021.03.15

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CiNii Article

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

In food industry, shortage of workers is a serious problem. Automation of food handling is a critical nowadays. To alleviate the damage during food picking by robotic hand, we propose non-contact acoustic impedance estimation with ultrasonic wave. We have the assumption of the correlation between hardness and acoustic impedance, and, built up ultrasonic transmission model considering attenuation by reflection and absorption, then, made an experiment to estimate the impedance. As the result, we succeeded in detecting acoustic impedance without contact.

DOI： 10.5954/ICAROB.2021.OS23-6

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.22  -  2021.01.24

In the future estimation of 2050, the food demand increases 70% and the production decreases 15% caused by global warming, and farmer population be 1/5 of current workers. Until 2050, we need an agricultural system of twice production with the same farmland area and 5 times effective operations. To realize the sustainable society, smart agriculture including robot technology, AI, IoT is one of the solutions for food issues. We have been working for a greenhouse project under enPiT-everi for implementation of robotic, AI and IoT technologies to agriculture. In this paper, we introduce the project and robotic applications.

DOI： 10.5954/ICAROB.2021.OS22-5

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Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

In agriculture, the aging and depopulation of farmers cause the shortages of farmers and manpower. Most of commercialized robots are industrial robots for factory automation, and most of robots for the first industry, agriculture, forestry and fisheries are still under developing. The reasons are cost-efficiency of the robotization, safety of the works using robots, difficulty of outdoor operations, and knowledge transfer problem from farmers to computer, etc. As one of solutions for the problems, robot technology into the agriculture is expected to contribute to the laborsaving, improvement of production, production line automation, and also the management toward smart-agriculture. We organize the Tomato-harvesting-robot competition to offer the research field and welcome researchers into agricultural robotics.

DOI： 10.5954/ICAROB.2021.PS-1

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Scopus

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

In this paper, to realize efficient underwater infrastructure inspection, automatic crack detection by image processing is proposed. In first process of our method generates enhanced image based on the absorbance from the turbidity meter and removes background component, and then detects crack from the enhanced image by using decision tree learning algorithm. This paper explains the algorithm of our method and shows evaluation experiment results.

DOI： 10.5954/ICAROB.2021.OS23-1

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

One of the main tasks of AUVs is to capture deep-sea images like fishes, crabs, other living organisms and resources for information leading to research on deep-sea ecosystems. Acoustic transmission are used to establish wireless underwater communications between the AUV and the ship. However, there are some limitations in the communication channels due to limited bandwidth, multi-path, temperature distribution and change in the direction of transmitting source and receiving sensor which results in losses in data being transmitted. Initially, the captured images are enhanced to reduce the effect of light attenuation and then compressed for transmission through acoustic modems. Only an important part of image is being transmitted through set of data packets. The received data packets in the ship will be reconstructed to predict the presence of living organisms. The loss in data during transmission creates a difficulty for the operators to predict the exact information. In this research, to compensate this transmission loss, an efficient compression and reconstruction technique using convolutional autoencoder with minimal distortion is proposed. Finally, for evaluation of the proposed image compression technique, the quality of reconstruction of images with and without data loss will be compared using the quality metrics signal to noise ratio (PSNR), structural similarity index(SSIM) and perceptual quality of image.

DOI： 10.5954/ICAROB.2021.OS23-4

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CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

In general, farm work is often hard work. In recent years, the number of farm laborers has been decreasing due to the aging of the workforce. Therefore, there is a need to automate agricultural work, and we are organizing a tomato harvesting robot competition to automate tomato harvesting. The competition includes a Junior Division for high school students and a Senior Division for college students. In this paper, we report on the results of 6th tomato harvesting robot competition.

DOI： 10.5954/ICAROB.2021.OS22-2

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CiNii Research

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

DOI： 10.5954/ICAROB.2021.OS23-5

Kyutacar

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

In Japan, expectations for the utilization of IT such as AI (Artificial Intelligence) and IoT (Internet of Things) are becoming greater and greater to address the shortage of working population due to the declining birthrate and aging population, and the depopulation of rural areas. There is a serious shortage of IT human resources, especially in rural areas, and I believe that IT human resource development is an urgent task to promote the super-smart society, Society 5.0, which is being promoted by the government. Thus, in order to promote business efficiency and productivity improvement, the utilization of IT in companies will become even more important[1].
Then, five universities, mainly in Kyushu and Chugoku regions, have been selected by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) for the enPiT-Pro project, and will collaborate to provide systematic and practical IT education programs to working people from local companies, with the aim of fostering advanced IT human resources. In this paper, we report on a class of the enPIT-everi program, the Agricultural IoT Education course.

DOI： 10.5954/ICAROB.2021.OS22-3

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

In order to acquire a time fluctuation data of the resources which needs for a marine resource development, we developed an observation device with low operational risk and a wide observable area. The observation device consists of an underwater station and an underwater vehicle, and underwater vehicle is tethered with a cable. By using the restraint condition of the cable, our device was able to navigate the trajectory planned only by thrust control with an error of up to 0.14m.

DOI： 10.5954/ICAROB.2021.OS23-2

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CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.21  -  2021.01.24

Improving the efficiency of fish feeding contributes to achieving sustainable expansion of the aquaculture industry. However, expert knowledge on feeding remains reliant on experience. This paper presents a new approach of digitizing such knowledge by measuring underwater currents induced by fishes as indicator of their behavior and appetite. A prototype current sensor suite was constructed to measure the current around the fish cage, especially during feeding.

DOI： 10.5954/ICAROB.2021.OS23-3

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Ocean is one of big challenging and extreme environments, and hard for human to access directly. As the tool for ocean survey, Autonomous Underwater Vehicles: AUVs are expected and developed from ‘80s. The recent rapid progress of computer and information technologies makes the development of AUVs easier and more practical. We had developed a handy AUV "Kyubic" for the observation of shallow water and artificial structures. In this paper, we describe the system architecture of Kyubic and the experimental results in Underwater Robotics Competition in Okinawa 2020.

DOI： 10.5954/ICAROB.2021.OS22-4

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2021.01.11  -  2021.01.13

DOI： 10.1109/IEEECONF49454.2021.9382643

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.11  -  2021.01.13

Harvestability is a quantitative index of how easy tomato fruits are to harvest using a robot. Previous studies on tomato harvesting robots have focused on tomato fruit detection methods, harvesting mechanisms, harvesting success rates, and harvesting times. However, tomato fruit harvestability using robots has not been quantitatively assessed. In this paper, we propose a method for evaluating the tomato fruit harvestability using a tomato harvesting robot. We first evaluated the harvestability qualitatively, based on the results of harvesting experiments conducted in a tomato greenhouse. Harvestability was then quantitatively evaluated using a camera (hereinafter referred to as a hand camera) attached to an end-effector of the tomato harvesting robot developed. The hand camera consists of an RGB camera and a depth camera. The occlusion ratio of obstacles (stems, peduncles, and other fruits) to a target fruit is calculated using the RGB image and depth image acquired by the hand camera. The larger the occlusion ratio was, i.e., the more obstacles there were in front of the target fruit, the more difficult the target fruit was to harvest. Conversely, if the occlusion ratio is low, the harvestability is high. This study shows that the occlusion ratio is effective as a quantitative indicator of the tomato fruit harvestability.

DOI： 10.1109/IEEECONF49454.2021.9382603

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2021.01.11  -  2021.01.13

DOI： 10.1109/IEEECONF49454.2021.9382670

Kyutacar

Scopus

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Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1109/JOE.2020.2978967

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Scopus

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DOI： 10.23919/OCEANS44145.2021.9705858

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DOI： 10.23919/OCEANS44145.2021.9705674

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

<p>To realize smart agriculture, we engaged in its systematization, from monitoring to harvesting tomato fruits using robots. In this paper, we explain a method of generating a map of the tomato growth states to monitor the various stages of tomato fruits and decide a harvesting strategy for the robots. The tomato growth state map visualizes the relationship between the maturity stage, harvest time, and yield. We propose a generation method of the tomato growth state map, a recognition method of tomato fruits, and an estimation method of the growth states (maturity stages and harvest times). For tomato fruit recognition, we demonstrate that a simple machine learning method using a limited learning dataset and the optical properties of tomato fruits on infrared images exceeds more complex convolutional neural network, although the results depend on how the training dataset is created. For the estimation of the growth states, we conducted a survey of experienced farmers to quantify the maturity stages into six classifications and harvest times into three terms. The growth states were estimated based on the survey results. To verify the tomato growth state map, we conducted experiments in an actual tomato greenhouse and herein report the results.</p>

DOI： 10.20965/jrm.2020.p1279

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

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DOI： 10.1504/IJRIS.2020.109647

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.2991/jrnal.k.200528.002

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Authorship：Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p>Friction drive systems are adopted for many robots of spherical locomotion type. Such systems have problems, including traversing uneven surfaces, slipping of the roller, and dust between the sphere and the roller. Despite of the disadvantages, these systems attract attention because of the possibility of stepped climbing and omnidirectional locomotion. In the future, it is anticipated that the mechanism using the sphere are developed. When the kinematics with respect to multiple rotational axes in arbitrary contacted on the sphere is clarified, the mechanism may be widely used. In the paper, a general theorem for kinematics is discussed including the number of rollers driving the sphere, the type of roller (constraint or unconstraint), and the contact points of the rollers on the sphere and the roller axes direction. To verify the validity of the kinematics model a locomotion model of the ball dribbling mechanism with the two rollers is presented as a special example by carrying out the experimental demonstration using the device robot. </p>

DOI： 10.7210/jrsj.38.485

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007855562

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.2991/jrnal.k.200512.004

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To promote the research of oceanic engineering technology, an underwater robot competition has been held since 2016. The seventh competition this year consists of AUV leagues, in which vehicles developed by university teams automatically cruise in the field, and junior leagues that participate in making underwater craft. This paper presents the competition regulations for the AUV and junior leagues and the results of the competition held in October 2019.

DOI： 10.57417/jaalr.1.1_12

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CiNii Research

Other Link： http://hdl.handle.net/10228/00008171

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Autonomous underwater vehicles (AUVs) observe a wide area by using mounted camera and LED lights and is used for bio-resource survey. However, AUVs is difficult to capture the sample useful for scientists. Previous AUVs can capture only specific benthos that its developer decided the target before resource survey, but scientists for fisheries resource can't chose sampling target during observation by AUVs. To realize an efficient bio-resources survey, the authors developed AUV that can capture the target instructed by the operator during observation. Because the slurp gun installed on the AUV has no canister, the AUV catches only one sample in one dive. This paper explains developed AUV and slurp gun with the canisters, and reports on sea trials using them.</p>

DOI： 10.1299/jsmermd.2020.1P1-C13

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007943437

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>We proposed a method for estimating the rotation of a moving rigid body in the field of view using high-speed visual information from an event-based vision. We employed a method based on linear regression from the viewpoint of computation cost as a method of estimating the pose of an object using visual information. While changing the pose of the object in the yaw direction, information on the object's appearance was obtained using an event-based vision. The image was generated by accumulating information from an event-based vision for a certain time. By pre-processing these images, binarized images and ternary images were respectively generated. With the above method, a data set of the pose of the object and the appearance of the object was prepared. We verified whether the pose of the object can be estimated from the information of the event-based vision by a linear regression model using dataset.</p>

DOI： 10.1299/jsmermd.2020.2P2-J07

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007944448

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>There are many marine resources including mineral and energy resources in Japanese EEZ and those have been surveyed by Underwater vehicles. It is expected that time-varying data will be continuously obtained with low risk in environmental surveys of the seabed. Therefore, we proposed the long-term observation method using Cable-restricted Underwater vehicles.</p>

DOI： 10.1299/jsmermd.2020.1P1-C07

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007943421

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>With the progress of technology, the realization of a symbiotic society with human beings and robots sharing the same environment has become an important subject. An example of this kind of systems is soccer game. Soccer is a multi-agent game that requires strategies by taking into account each member's position and actions. In this paper, we discuss the results of the development of a learning system that uses SOM to select behaviors depending on the situation.This system can reproduce the action selection algorithm of all players in a certain team, and the robot can instantly select the next cooperative action from the information obtained during the game.Because of this system, common sense rules was shared to learn an action selection algorithm for a set of agents, not only a team consisting of robots alone, but also a group of heterogeneous agents consisting of humans and robots.</p>

DOI： 10.1299/jsmermd.2020.2A1-R06

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007943934

Authorship：Last author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In food industry, autonomous food arrangement is expected. For the achievement of safety food arrangement by robots, in order to prevent from damaging food, rigidity of the hands is hopeful to be adjusted according to the food stiffness. Measurement of the food stiffness should be estimated before handling. In this research, we propose non-contact stiffness measurement with ultrasound to enable variable rigidity of hands while food handling is ongoing.</p><p>We measured power spectrum of ultrasound reflected on food. As the result of the experiment, the spectrum varied according to the stiffness.</p>

DOI： 10.1299/jsmermd.2020.1A1-K06

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007943408

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1109/JOE.2018.2872500

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2020.01.13  -  2020.01.16

DOI： 10.5954/ICAROB.2020.OS23-1

Kyutacar

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Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

2020.01.13  -  2020.01.16

DOI： 10.5954/ICAROB.2020.OS23-3

Kyutacar

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2020.01.13  -  2020.01.16

Saliency is a property of images that triggers bottom-up attention. For example, if a location in an image is sufficiently different from its surrounding and worthy of paying attention, such characteristic of image is saliency. From the point of view, the location of larger saliency is outstanding visually. On the other hand, As Image Feature extraction method, such as SIFT or SURF, robust feature matching has been realized under the existence of changing size or rotation of observed target. For the consequence, its advantage has been introduced into image stitching and Visual SRAM. However, the amount of image features is susceptive to changing photographing condition, such as luminance variety, defocus-ing etc. We assumed that feature extraction stability is large in salient region because of steep bright-ness gradient. We evaluated the relationship between saliency and feature extraction stability.

DOI： 10.5954/ICAROB.2020.OS24-3

Kyutacar

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2020.01.13  -  2020.01.16

In order to improve the efficiency of the seafloor survey, it is necessary for AUV to report the state of the seafloor to the operators on board reasonably. We have been developing seafloor image selection and image compression technology for the seafloor image transmission using the underwater acoustic communication device. In this paper, we report the results of underwater image selection and transmission in biological sampling experiments conducted in November 2019 off the coast of Suruga-bay, Shizuoka, Japan.

DOI： 10.5954/ICAROB.2020.OS23-2

Kyutacar

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2020.01.13  -  2020.01.16

Tomato is one of the important fruit vegetables and most tomatoes are produced in the greenhouses, or large-scale farms, where the high temperature and humidity, and long harvest age force the farmer heavy works. To develop the tomato harvesting robot, many research issues exist such as manipulator design, end-effector design, collaborative behavior, artificial intelligence, motor control, image processing, target recognition and so on. With an aim to promote the automation of tomato harvesting, we have organized the tomato harvesting robot competition since 2014. In this paper, we report on the results of 5th tomato harvesting robot competition in 2018.

DOI： 10.5954/ICAROB.2020.OS22-4

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Language：English   Publishing type：Research paper (international conference proceedings)

2020.01.13  -  2020.01.16

DOI： 10.5954/ICAROB.2020.OS22-5

Kyutacar

Scopus

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2020.01.13  -  2020.01.16

Acquiring flexible and agile behaviors as seen in biological systems, the robot can achieve acrobatic movements such as jumping and throwing. These acrobatic movements are expected to extend the range of robot activity. In this research, we propose a special mechanism using a pair of motors, springs and cams, which has three functions: normal operation, instantaneous operation and variable rigidity. Then, we derived a mathematical model of the mechanism and discussed the input-output characteristics of the mechanism by changing the design parameters, and analyzed the difference between the theoretical and measured results.

DOI： 10.5954/ICAROB.2020.OS24-6

Kyutacar

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CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2020.01.13  -  2020.01.16

With the progress of technology, the realization of a symbiotic society with human beings and robots sharing the same environment has become an important subject. An example of this kind of systems is soccer game. Soccer is a multi-agent game that requires strategies by taking into account each member's position and actions. In this paper, we discuss the results of the development of a learning system that uses SOM to select behaviors depending on the situation.

DOI： 10.5954/ICAROB.2020.OS22-2

Kyutacar

Scopus

CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

Animals can achieve agile behaviors such as jumping and throwing in addition to flexible behaviors with the same musculoskeletal systems, and those movements can extend the range of their activities. We have been working on actuators capable of rapid and flexible motions learning the musculoskeletal systems. In this paper, we propose a new rotary actuator using a pair of motors, springs, and cams to perform three functions, namely, normal motion, rapid or instantaneous motion, and rigidity control using an antagonistic cam mechanism, and describe the operating principle of the proposed mechanism, the mathematical model of the mechanism during rapid motion, and the design principle of the cam, which is a key mechanical element in this mechanism. Finally, we present an analysis of the error between the theoretical the measurement results during rapid motion.

DOI： 10.57417/jaalr.1.3_144

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008167

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.2991/jrnal.k.191203.002

Kyutacar

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DOI： 10.2991/jrnal.k.191202.002

Kyutacar

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/ICIIS47346.2019.9063345

Kyutacar

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DOI： 10.1109/ICIIS47346.2019.9063302

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DOI： 10.2991/jrnal.k.190829.002

Kyutacar

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東京   2019.09.04  -  2019.09.06

DOI： 10.34385/proc.57.SS1-1

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.2991/jrnal.k.190531.006

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DOI： 10.2991/jrnal.k.190531.004

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France   Marseille   2019.06.17  -  2019.06.20

DOI： 10.1109/OCEANSE.2019.8867481

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

日本   広島   2019.06.06  -  2019.06.09

<p>In this paper, we propose a new formula to accurately estimate the output value on the real machine of the proposed mechanism as a part of the development concerning the high power joint mechanism. The previously proposed formula did not consider the energy loss when the slider translated. Considering the mass of the slider, we derived an expression that can estimate the angular velocity of the output link from the energy conservation law and the geometrical relationship. As a result of comparing the theoretical value and measured value, the performance of real machine could be more accurately estimated by using the proposed mathematical formula.</p>

DOI： 10.1299/jsmermd.2019.1P2-K09

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007774443

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

日本   広島   2019.06.06  -  2019.06.09

<p>This paper presents the information presentation device for alerting 4 dangerous situations on a platform by vibration stimulation of a local position. The vibrator mounted on the information presentation device is provided with vibration isolation to prevent confusion of the presented information. In order to confirm the occurrence of the vibration stimulus at the local position, the measurement experiment of the vibration acceleration was carried out using the acceleration sensor. From the result of power spectrum analysis using the fast Fourier transformation to the measured vibration acceleration, periodic damping was confirmed at a portion other than the vibrator that presents information.</p>

DOI： 10.1299/jsmermd.2019.2A2-B03

Kyutacar

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007774800

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

日本   広島   2019.06.06  -  2019.06.09

<p>We investigated the adjustment method of exposure times for multi-exposure image fusion. Because the range of luminance in the natural environment is wide, the camera system need to adapt to the ambient light. The proposed system comprises an image sensor module and a field-programmable gate array (FPGA) which is composed of control circuits for an image sensor, HDR image generator/evaluator and control circuits for external modules. In this study, the exposure time adjustment method is to select the combination with the maximum entropy or the minimum sum of squared difference between equalization histogram to original histogram. As a result, we obtained an image where has high contrast all of area.</p>

DOI： 10.1299/jsmermd.2019.2P2-H10

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007775289

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

日本   広島   2019.06.06  -  2019.06.09

<p>A tomato harvesting robot that can change the hardware configuration depending on the greenhouse has few development cases, and such robots are also important in terms of operation and development cost. We focus on the tomato harvesting robot that can change only the hardware configuration without changing the basically software configuration. In developing such a robot, it is important to modularize the hardware as the component. Building a distributed system makes it unnecessary to change the software configuration even if the hardware and sensors are changed, and it is possible to develop different robots only by changing the modules. In this study, three tomato harvesting robots with different hardware configurations are developed based on the above development concept. Two types of manipulators and moving mechanisms are introduced. We also report harvest experiments using two manipulators.</p>

DOI： 10.1299/jsmermd.2019.1A1-E08

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007774067

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

日本   広島   2019.06.06  -  2019.06.09

<p>With the progress of technology, the realization of a symbiotic society with human beings and robots sharing the same environment has become an important subject. An example of this kind of systems is soccer game. Soccer is a multi-agent game that requires strategies by taking into account each member's position and actions. The behavior of a player changes depending on the game situation, such as the score gap, the remaining time and the importance of the match. In this paper, a futsal game played by agents is observed and analyzed to find a mapping relationship. The strategy in the team is analyzed based on the state vector parameters using a Self-Organizing Map (SOM) and different behaviors are analyzed and compared to achieve, in the future, the best possible result cooperation in a real game.</p>

DOI： 10.1299/jsmermd.2019.1P2-I01

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007774523

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

台湾   Kaohsiung   2019.04.16  -  2019.04.19

DOI： 10.1109/UT.2019.8734330

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台湾   Kaohsiung   2019.04.16  -  2019.04.19

DOI： 10.1109/UT.2019.8734461

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台湾   Kaohsiung   2019.04.16  -  2019.04.19

DOI： 10.1109/UT.2019.8734462

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DOI： 10.1002/cem.3092

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日本   Beppu   2019.01.10  -  2019.01.14

Tomato fruit harvesting is a labor-intensive process, and therefore robotic automation is required. For tomato fruit harvesting robot, we developed three types of end-effectors (EEs): scissor type, cylinder type and suction-cutting type. It is necessary to harvest the tomato fruit with calyx especially in Japan. Therefore, the proposed EE has a cutter mechanism for cut the peduncle. The results show that the scissor type and the cylinder type EE can cut the peduncle; however, it is difficult to separate one fruit from the cluster. On the other hand, the suction-cutting type can separate and cut one fruit from the cluster and therefore it is useful for harvesting tomato fruit with calyx.

DOI： 10.5954/ICAROB.2019.OS22-3

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

Soil compaction is a form of soil degradation which causes soil erosion, drainage difficulties, and loss of nutrients. To mitigate this issue, in agricultural farms several methods have been adopted. In this paper the preliminary study of a locomotion system with adjustable contact patches is proposed. Aim is to reduce the compaction and optimize the rolling resistance of a grape transporting robot employed in vineyard. A Finite Element Method model supported by experimental results is developed to study the system.

DOI： 10.5954/ICAROB.2019.OS20-5

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

Communication is one of the challenges for UAVs during operations inside tunnels. In this paper, a wireless network system using multiple drones functioning as repeaters is proposed. A number of measurements for Wi-Fi signals are conducted to confirm the effect of different scenarios on the signal in virtual tunnel and real life tunnel. As a result, RSS with -64 dBm can provide five Mbps of bandwidth.

DOI： 10.5954/ICAROB.2019.OS20-3

CiNii Research

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

DOI： 10.5954/ICAROB.2019.OS20-2

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

Maintenances of social infrastructures such as dam, bridge are important subjects. The more aging problem going on, the more the effective inspection methods have been expected. In the inspection of dams, divers observe the conditions of their surface manually, however underwater structure deeper than 30m is limited and their inspections are insufficient. In this paper, we propose the ROV whose functions are video capture, indirect measurement using laser, target depth keeping, heading keeping. The ROV is applied into the dam inspection and showed the effectiveness to find cracks. In this study, The Remotely Operated Vehicle (ROV) is developed with the aim of practical application of technologies capable of replacing and supporting dam inspection by diver. Using the developed ROV, we conducted in the 'Verification field of the next generation social infrastructure robot' which was publicly offered by the Ministry of Land, Infrastructure and Transport in FY 2015 and examined its usefulness. In the verification on-site, it was able to satisfy about half of the required inspection items.

DOI： 10.5954/ICAROB.2019.OS21-4

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

In order to measure an accurate volume of the resources, the authors developed a new three-dimensional instrument consisting of a laser projector and a camera. The laser projector irradiates a sharp two-dimensional laser pattern independent the distance to the target object. Our instrument was able to measure three-dimensional shape of the target object with maximum error of 5% in the water, at one scan

DOI： 10.5954/ICAROB.2019.OS21-3

CiNii Research

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

Inspection of underwater infrastructure of bridge pier is important for bridge maintenance, however, the underwater environment is dangerous and their observation is one of difficult problems. We have been developing the underwater inspection system which consists of an unmanned surface vehicle (USV) and a remotely operated vehicle (ROV). The concepts of the system are (1) Operation is executable with a small number of persons, (2) USV and ROV are controllable from land or bridge, (3) Build 3D model and images for crack detection. The ROV observes the status of whole infrastructure using cameras and control its posture using a depth sensor and IMU sensor. The USV vertically lifts up and down ROV by winch and carries ROV to the infrastructure. USV has GPS, LRF and IMU for horizontal positioning and pan-tilt control of the camera. In this paper, we discuss the results of the inspection operation test by the robot.

DOI： 10.5954/ICAROB.2019.OS21-2

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

We developed an AUV's sampling device control system. It is employed the any toolboxes provided in MATLAB/Simulink by Mathworks. The toolboxes are powerful, useful, and functional. "Robotics System Toolbox" in theirs supports the ROS middle ware. It provides the cloud data communication. "Parallel Computing Toolbox" can struct a multi process and parallel computing on script base and Simulink model base program. "Stateflow" is a powerful tool for design of state transition control method. The toolboxes are employed in the sampling device control system of the AUV. This method with using the toolboxes of MATLAB/Simulink realize the rapid prototyping of the system designs, developments and system test. The developed system mounted on an AUV was powered in several real sea areas. Report on the results and problems when operating in real environments.

DOI： 10.5954/ICAROB.2019.OS21-1

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

RoboCup is a platform designed to promote such research fields as artificial intelligence (AI) and robotics. In recent years the Middle size league soccer robot has a ball dribbling mechanism. This mechanism controls the ball with two driving rollers and in order to play soccer games well, ball control capability and holding capacity are indispensable. As the result of a survey at the 2017 World Cup, all teams in the world have determined the rollers arrangement heuristically, and no mathematical consideration has been made. In this research, we focus the sphere slip velocity and derive relationship sphere slip speed and sphere mobile speed. and evaluated the roller arrangement in the world teams.

DOI： 10.5954/ICAROB.2019.OS22-4

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   Beppu   2019.01.10  -  2019.01.14

Tomato is one of important fruit vegetables and most tomatoes are produced in the greenhouses, or large scale farms, where the high temperature and humidity, and long harvest age force the famers heavy works. In this paper, we report on the results of 4th tomato harvesting robot competition.

DOI： 10.5954/ICAROB.2019.OS22-2

CiNii Research

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

韓国   PyeongChang   2018.10.17  -  2018.10.20

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韓国   PyeongChang   2018.10.17  -  2018.10.20

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

韓国   PyeongChang   2018.10.17  -  2018.10.20

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   神戸   2018.05.28  -  2018.05.31

DOI： 10.1109/OCEANSKOBE.2018.8559296

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<p>Due to the aging and decreasing the number of workers in agriculture, the introduction of automation and precision is needed. Focusing on tomatoes, which is one of the major types of vegetables, we are engaged in the research and development of a robot that can harvest the tomatoes and manage the growth state of tomatoes. For the robot to automatically harvest tomatoes, it must be able to automatically detect harvestable tomatoes positions, and plan the harvesting motions. Furthermore, it is necessary to grasp the positions and maturity of tomatoes in the greenhouse, and to estimate their yield and harvesting period so that the robot and workers can manage the tomatoes. The purpose of this study is to generate a tomato growth state map of a cultivation lane, which consists of a row of tomatoes, aimed at achieving the automatic harvesting and the management of tomatoes in a tomato greenhouse equipped with production facilities. Information such as the positions and maturity of the tomatoes is attached to the map. As the first stage, this paper proposes a method of generating a greenhouse map (a wide-area mosaic image of a tomato cultivation lane). Using the infrared image eases a correspondence point problem of feature points when the mosaic image is generated. Distance information is used to eliminate the cultivation lane behind the targeted one as well as the background scenery, allowing the robot to focus on only those tomatoes in the targeted cultivation lane. To verify the validity of the proposed method, 70 images captured in a greenhouse were used to generate a single mosaic image from which tomatoes were detected by visual inspection.</p>

DOI： 10.20965/jrm.2018.p0187

Kyutacar

Scopus

CiNii Article

CiNii Research

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<p>We developed a vision system for an autonomous underwater robot with a benthos sampling function, specifically sampling-autonomous underwater vehicle (AUV). The sampling-AUV includes the following five modes: preparation mode (PM), observation mode (OM), return mode (RM), tracking mode (TM), and sampling mode (SM). To accomplish the mission objective, the proposed vision system comprises software modules for image acquisition, image enhancement, object detection, image selection, and object tracking. The camera in the proposed system acquires images in intervals of five seconds during OM and RM, and in intervals of one second during TM. The system completes all processing stages in the time required for image acquisition by employing high-speed algorithms. We verified the effective operation of the proposed system in a pool.</p>

DOI： 10.20965/jrm.2018.p0248

Kyutacar

Scopus

CiNii Article

CiNii Research

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<p>A hovering-type autonomous underwater vehicle (AUV) capable of cruising at low altitudes and observing the seafloor using only mounted sensors and payloads was developed for sea-creature survey. The AUV has a local area network (LAN) interface for an additional payload that can acquire navigation data from the AUV and transmit the target value to the AUV. In the handling process of the state flow of an AUV, additional payloads can control the AUV position using the transmitted target value without checking the AUV condition. In the handling process of the state flow of an AUV, additional payloads can control the AUV position using the transmitted target value without checking the AUV condition. In this research, water tank tests and sea trials were performed using an AUV equipped with a visual tracking system developed in other laboratories. The experimental results proved that additional payload can control the AUV position with a standard deviation of 0.1 m.</p>

DOI： 10.20965/jrm.2018.p0238

Kyutacar

Scopus

CiNii Article

CiNii Research

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Authorship：Lead author   Language：English   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

<p>The importance of primary industries, agriculture, forestry and fisheries, is obvious and needless to mention, however, the reduction of the working population and the aging problem make the situation of primary industry more sever. To compensate for the issues, the advanced technology in robotics has attracted attentions and expected the contributions in terms of productivity, cost effectiveness, pesticide-less, monitoring of the growth and harvesting, etc. Recently, robotic technologies are gradually being used in primary industry and their application area will expand more in the near future. This special issue’s objectives include collecting recent advances, automation, mechanization, research trends and their applications in agriculture, forestry and fisheries to promote a deeper understanding of major conceptual and technical challenges and facilitate spreading of recent breakthroughs in primary industries, and contribute to the enhancement of the quality of agricultural, forestry and fisheries robots by introducing the state-of-the-art in sensing, mobility, manipulation and related technologies.</p><p>In this special issue, twelve papers are included. The first paper by Noguchi is the survey paper of the state-of-the-art in the agricultural vehicle type robots and discusses the future scope of agriculture with robotics. The next three papers are on tomato-monitoring system, and Fukui et al. propose a tomato fruit volume estimation method using saliency-based image processing and point cloud and clustering technology, Yoshida et al. do the cutting point identification for tomato-harvesting using a RGBD sensor and evaluate in the real farm experiments, and Fujinaga et al. present an image mosaicking method of tomato yard based on the infrared images and color images of tomato-clusters in the large green house. The fifth paper by Sori et al. reports a paddy weeding robot in wet-rice field to realize the pesticide-free produce of rice, and the sixth paper by Shigeta et al. is about an image processing system to measure cow’s BCS (Body Condition Score) automatically before milking cows and analyzes the two months data by CNN (Convolutional Neural Network). The seventh paper by Inoue et al. reports on an upper-limb power assist robot with a single actuator to reduce the weight and cost. The assist machine supports the shoulder and elbow movements for viticulture operations and upper-limb holding for load transport tasks. In the next paper, Tominaga et al. show an autonomous robotic system to move between the trees without damaging them and to cut the weeds in the forest for the forest industry. The last four papers are for the fishery industry, and Komeyama et al. propose a methods for monitoring the size of fish, red sea bream (RSB) aquaculture by developing a stereo vision system to avoid the risks of physical injury and mental stress to the fish. Nishida et al. report on a hovering type underwater robot to measure seafloor for monitoring marine resources whose sensor can be replaced depending on missions as the open hardware system. Yasukawa et al. propose a vision system for an autonomous underwater robot with a benthos sampling function, especially, sampling-autonomous underwater vehicles (SAUVs) to achieve a new sampling mission. The last paper by Han et al. is for gait planning and simulation analysis of an amphibious quadruped robot in the field of fisheries and aquaculture.</p><p>We hope that this special issue can contributes to find solutions in primary industries, agriculture, forestry and fisheries.</p>

DOI： 10.20965/jrm.2018.p0163

Scopus

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

For sustainable use of fisheries resources, it is important to estimate the amount of resources such as TAC (Total Allowable Catch), TAE (Total Allowable Effort) and their investigations have been conducted by bottomed net fishing, however, the method suffers environmental damages. The survey method for wider area that does not affect the ecosystem is needed. Recently, research using an autonomous underwater robot (AUV) is introduced as a new survey method as the solution. We also introduced an AUV for the survey of fish and crabs in the Sea of Okhotsk. The number of marine lives is measured manually, and the technique of automatic measurement of the number is needed for the observation. In this research, we propose an automatic marine life recognition method from seafloor images.

DOI： 10.5954/icarob.2018.os20-3

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

This paper presents a tomato fruit recognition method using plant characteristics of tomato and infrared images. Labor shortage and aging are problems in Japanese agriculture field. We aim to realize automatic harvesting and production management system of tomato. For that, it is necessary to detect the position and maturity of tomato fruit. Tomato fruit shows high reflectance against infrared light. The specular reflection part of the tomato fruit in the infrared image is used as training data. The Tomato harvesting robot can focus only on tomato fruit in the harvestable range by using infrared image. We use the images acquired at the actual tomato greenhouse to evaluate this proposed method. As a result of machine learning, Precision is 0.940, Recall is 0.808, and F-measure is 0.868.

DOI： 10.5954/icarob.2018.os21-5

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

As technology develops, realization of a symbiotic society between human beings and robots sharing their environment has become one of most important subjects. For example, soccer is a multi-agent game that require strategies such as each members' position and defense. The behavior of a player changes depending on the game situation such as winning or losing, score gap, remaining time. The players may play offensive when their team is losing, or be defensive when their team is winning with minimum score difference. In this paper, human soccer game is observed and analyzed to determine how the state vector of each players affect team behavior. The team strategy is analyzed based on parameters such as the positions, the number players, score, time and actions of soccer robots using Self-Organizing Map(SOM)

DOI： 10.5954/icarob.2018.os21-4

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

For autonomous underwater vehicle (AUV), high autonomy is required in order to accomplish mission such as inspection, observation, manipulation under extreme environments, deep-ocean. One of necessary function for AUV is acoustic navigation. In this paper, we conducted homing experiments using a small AUV and acoustic pinger with chirp signal. The chirp signal has the feature that the frequency of signal change gradually, so that the signal is suitable to calculate the correlation between the time difference between hydrophones. The homing experiments are carried out and evaluated through tank tests.

DOI： 10.5954/icarob.2018.os20-4

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Underwater imaging is an important part to seafloor observation by underwater robot. Underwater robots provide many images, which contain seafloor environment, and theses images contribute to various fields such as marine biology, marine geology and fishery science. However, underwater images has different properties, such as uneven illumination and light attenuation, compared to images which taken in air, and these properties impede image checking by researchers. In this paper we propose an image enhancement based on scale-gain Retinex, and the proposed method is experimented on the Suruga-bay in Japan.

DOI： 10.5954/icarob.2018.os20-2

CiNii Research

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2018.02.01  -  2018.02.04

Spherical wheel motion driven by rollers attract attention due to the possibility of uneven surface. RoboCup is a platform designed to promote the research fields such as Artificial Intelligent (AI) and robotics, and one of examples is the ball dribbling mechanism of RoboCup Middle size league robot, and this mechanism controls the ball with two driving rollers. As the result of the survey at the 2017 World Cup, all teams in the world have determined the roller arrangement heuristically, and no mathematical consideration has been made. In this study, we propose a model considering slip, discuss the relationship between slip ratio and robot speed using evaluation function, and verify the model by experiment.

DOI： 10.5954/ICAROB.2018.OS21-3

CiNii Research

Authorship：Last author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2018.02.01  -  2018.02.04

In a project of subsea mining in the near future, many work class robots such as crawlers, drilling machines, or ore collectors will be installed on the seabed. These robots are heavy but they must be landed on the seabed very softly to avoid impact damage from the seabed. So the installation method is very important and effective installation method should be investigated. In this paper, we examined vibration motion of a suspended heavy machine by a crane vessel through dynamics modeling and simulation in the horizontal plane. Descending speed of the machine affects the amplitude of the vibration, that is, if the descending speed is higher, larger amplitude will be observed. To suppress this vibration, we examined a velocity feedback control by attaching a thruster to the machine. From simulation results, we found horizontal vibration will be effectively suppressed by using simple feedback control.

DOI： 10.5954/ICAROB.2018.OS20-5

CiNii Research

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2018.02.01  -  2018.02.04

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2018.02.01  -  2018.02.04

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2018.02.01  -  2018.02.04

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2018.02.01  -  2018.02.04

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2018.02.01  -  2018.02.04

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Many saliency maps in visual image researches are proposed as human attention models. In general saliency maps, three image feature extractions, color contrast, edge gradient and intensity are utilized and DoG (Difference of Gaussian) is applied for each image feature to have a saliency map. We are focusing on selecting stable feature extraction to have stable saliency map. Although various sizes of objects exist in an image, stability of feature extraction is very important in various scales of images. If the DoG filter scale is improper, feature extraction does not work stably and also important feature can be missed after feature selection. In order to solve the problems, we propose to calculate the scale values which maximize differences between two different scale DoG images' scales so as to important objects are extracted.</p>

DOI： 10.1299/jsmermd.2018.2A2-L17

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007551777

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>This paper presents a generation method of tomato growth state map that has maturity and position of tomato. The tomato growth state map is used for the tomato harvesting robot to automatically plan the harvesting movement. As a first step of generating the tomato growth state map, a mosaic image expressing the tomato cultivation environment is generated. Next, immature to mature tomato are recognized by recognition method using infrared image. Based on color and depth information, maturity of tomato is judged and tomato position is calculated. This information is added to the mosaic image, and the tomato growth state map is generated. 19 immature tomatoes and 7 mature tomatoes were automatically detected from tomato state growth map that generated from 10 images.</p>

DOI： 10.1299/jsmermd.2018.1P1-A05

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007551123

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>As technology develops, realization of a symbiotic society between human beings and robots sharing their environment has become one of most important subjects. For example, soccer is a multi-agent game that require strategies such as each members' position and defense. The behavior of a player changes depending on the game situation such as winning or losing, score gap, remaining time. The players may play offensive when their team is losing, or be defensive when their team is winning with minimum score difference. In this paper, human soccer game is observed and analyzed to determine how the state vector of each players affect team behavior. The team strategy is analyzed based on parameters such as the positions, the number players, score, time and actions of soccer robots using Self-Organizing Map(SOM)</p>

DOI： 10.1299/jsmermd.2018.2P2-L09

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007552222

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Rich undersea mineral resources are confirmed around Japan and the research about undersea mineral resources and deep sea creatures has been conducted actively. Since three-dimensional data could not be get by human, three-dimensional measurement technology is important in the deep sea survey. Therefore we designed a measuring device suitable for underwater environment. </p>

DOI： 10.1299/jsmermd.2018.2P2-C07

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007551964

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1007/s00773-017-0442-1

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.2991/jrnal.2017.4.3.15

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

DOI： 10.1007/s00773-017-0448-8

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Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/OCEANSE.2017.8084917

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DOI： 10.1109/OCEANSE.2017.8084926

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日本   太宰府   2017.09.06  -  2017.09.08

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

日本   太宰府   2017.09.06  -  2017.09.08

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Language：English   Publishing type：Research paper (international conference proceedings)

別府   2017.01.19  -  2017.01.22

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Underwater robot is one of the important research tools to explore deep-sea. Especially, Autonomous Underwater Vehicles (AUVs) attract attentions as new tools because they are un-tethered and suitable for wide area observation. As the next generation AUV, we have been developing a Sampling-AUV that can dive into deep-sea and bring back marine creatures using a mounted manipulator. In the mission, the AUV transmits the deep-sea floor images to the support ship using acoustic communication, and the operator selects the marine creatures to sample and bring back them. In this talk, we introduce the new AUV, the underwater manipulator and image processing techniques for sampling.

DOI： 10.5954/icarob.2017.ps1

CiNii Research

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

UV requires high autonomy to accomplish various deep-ocean observation missions, and the next AUV is expected to have sampling function of marine benthos, that is, the end-effector to catch and bring back marine creatures. However, sampling is not easy task for AUV as the shape, size, motion of targets differs. One of the effective end-effectors is the slurp-gun type device to absorb the target with water. In this research, we had developed a sampling device for deep-ocean observation and sampling AUV, Sampling-AUV TUNA-SAND2 in order to inspection of marine ecosystem.

DOI： 10.5954/icarob.2017.os7-6

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)

The Joint Graduate School Intelligent Car and Robotics Course, called “Car-Robo Joint Graduate School” is an educational program that started in 2012 mainly at The Kitakyushu Science and Research Park (KSRP). Graduate schools of engineering in Kyushu Institute of Technology, the University of Kitakyushu, and Waseda University at KSRP participate in this program. The purpose of this program is to foster highly skilled personnel in technical fields on intelligent car and robot technology. They will gain practical ability as leaders, mastering their special fields, understanding the peripheral technologies, and leading research and development teams. The special-feature program of this course is seven comprehensive practicums as team learning. Internship students of national colleges of technology and other universities as well as master and PhD course students of these graduate schools participate in the practicums.

DOI： 10.4307/jsee.65.4_51

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130005966874

Authorship：Last author   Language：Chinese   Publishing type：Research paper (conference, symposium, etc.)

<p> </p>

DOI： 10.14864/fss.33.0_651

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CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007611488

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Deep-sea exploration has taken a remarkable attention among the researchers and we are developing a group of autonomous underwater vehicles (AUVs) dedicated for deep-sea observations, collecting sea creatures and biological samples. We discuss the basic development of the mechanical, hydraulic and electrical systems of 4 degrees of freedom (DOF) underwater hydraulic manipulator. Manipulator system design is explained in details along with the design requirements and experimental results. The developed manipulator is successfully installed on the AUV named TunaSand2 and a number of experiments are performed in different deep-sea sites to realize the usability and reliability of the manipulator system.</p>

DOI： 10.1299/jsmermd.2017.2p1-f11

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-F11/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In RoboCup Soccer middle size league, we need to cope various enemy attacks such as dribble, pass and shoot. Therefore, cooperative defense behavior system by multiple robots is required. We aim to realize cooperative defensive behavior with reference to soccer tactics of human. There is Challenge & Cover as one of the basic defense tactics of human soccer. In this research, we develop the defensive behavior algorithm of Challenge & Cover using information of enemies, teammates and ball positions, and implement it to the soccer robots. We compared conventional algorithms and new algorithms by simulation, confirmed that it has higher defensive performance than those.</p>

DOI： 10.1299/jsmermd.2017.2p1-j10

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-J10/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Saliency detection is used to estimate which information in images attracts human attention in view of color and brightness contrast. Humans can perceive objects more sharply what they focus on than what they do not. In Saliency detection, Gaussian pyramid and Center-Surround difference realizes this human visual mechanism.<br>The author introduced Saliency detection in place recognition by mobile robots. The aim of the introduction is to lessen the amount of features and colors that are extracted from training images. Input data of Support Vector Machine is Color and Visual Word Histogram.<br>We evaluated the amount of extracted features and place recognition rate of Support Vector Machine. As the result, we succeeded in executing efficient environment recognition. The correct prediction rate increased by 14 percent, and the amount of features decreased by 85 percent compared to the case of no saliency detection.</p>

DOI： 10.1299/jsmermd.2017.1p2-j04

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_1P2-J04/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>A rich undersea mineral resource is confirmed in the basin of Japan. Three-dimensional measurement technology is indispensable for developing undersea resources. By applying structural light to the underwater environment, it is possible to measure not only the three-dimensional topography but also the seabed creature. Therefore, we aim to develop an underwater three-dimensional measuring device using structured light and light cutting method. In order to develop a new three-dimensional measuring instrument, basic measurement theory was verified.</p>

DOI： 10.1299/jsmermd.2017.2a2-o07

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2A2-O07/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Many mechanisms with Impulse Force Generator is generally operated at high speed and strong force. We have been working on high power joint mechanism imitating locust hind-leg in order to realize a mechanism capable of not only rapid motion but also normal motion. However, they have some problems as following. In rapid motion, The developed mechanism has energy loss due to the viscous resistance of the reduction gear of the actuator. And the direction of rotation during rapid motion is restricted. In this paper, we propose a high power joint mechanism with higher performance which solves this problem. The mechanism proposed by us can perform rapid motion and normal motion at clockwise and counterclockwise. And the mechanism can change of the articular compliance. The mechanism consist two motors with cams, two wires, one spring and some links. Our verification experiment of rapid motion showed that the proposed mechanism can realize rapid motion without viscous drag.</p>

DOI： 10.1299/jsmermd.2017.2a1-a06

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2A1-A06/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>RoboCup is an international project to promote fields such as robotics, Artificial Intelligent (AI), and related field. It is an attempt to apply AI and Intelligent robotics research by providing standard problems where a wide variety of technologies can be integrated and examined. We organized RoboCup team “Hibikino-Musashi” for Middle-Size League soccer competition. Ball dribbling in soccer games of Middle size league is the most important action. Also recently, advanced co-operated behavior control system action is required. Therefore, in this research, the kinematics and effectiveness of the kinematics at the time of ball dribbling is focused.</p>

DOI： 10.1299/jsmermd.2017.2p1-k09

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-K09/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Various abilities are required for autonomous robots because they act judge and act on their own. The selflocalization problem that recognizes the surrounding environment and estimates the position is one of the most important tasks. The self-localization system is highly dependent on operating conditions, environment, and available sensors. That system is desirable operate stably for a long time. In this research, we focus on autonomous mobile robots for the RoboCup soccer meddle size league (MSL), but self-position kidnapping is a big problem. Therefore, we propose self-localization algorithm combining particle filter and perfect match, and aim for improvement of accuracy and stability of self-localization.</p>

DOI： 10.1299/jsmermd.2017.2p1-j12

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CiNii Research

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>AUV is stable for a wide range of search because it does not have an umbilical cable. However, AUV cannot work for a long time because of internal power source. Utilization of charging station in the water is required for long-term operation to solve this problem. In this paper, it is described a navigation system to the station with acoustic positioning system that mounting is possible to the AUV. It has three hydrophones and receives signal from that pinger is mounted the station. Sound source detection is calculated by Cross Correlation Function and Super Short Base Line method. In addition, it is introduced chirp signal as the pinger to develop a robust the system against noises. It is applied the developed system and carried out the experiment for navigation to the pinger. The present result suggested that sound source detection and guidance to the station are feasible in this system.</p>

DOI： 10.1299/jsmermd.2017.2p1-e09

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-E09/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In the soccer games, the behavior selection of each player changes depend on the positional relationship of the ball and the every player’s position on the field. The player closest to the ball near the opponent team’s goal aims at a shot, and the farthest player waits at a position where he can return at any time to his own goal to protect. Currently most of RoboCup soccer teams keep the same strategy during the game so that the result of game depends on the ability of each player like speed of robot, quality of localization, obstacle avoidance and ball handling. Next issue for the robot intelligence is collaborated team behavior and strategy. The autonomous soccer robots are required to behave cooperatively and make decision using environment and game situation. In this research, the team strategy is analyzed based on the positions of human player using Self-Organizing Map (SOM).</p>

DOI： 10.1299/jsmermd.2017.2p1-k07

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-K07/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>This paper presents a feature point matching to generate mosaic image that expresses a cultivation environment, as a part of behavior strategy of tomato harvesting robot. Since that mosaic image requires tomato fruits and stems in front face, in this study, an IR image suitable for detecting the object in front is used. Proposed method uses robot moving distance and location of original feature point to decide detection area to search for feature point. Compare features of feature points in this area and original feature point, then decide matching point. Feature point matching of two consecutive infrared images was performed. By adding detection area of feature point, it is possible to reduce false matching.</p>

DOI： 10.1299/jsmermd.2017.1a1-b05

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_1A1-B05/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Japan is a maritime country with vast territorial waters. Long-term investigation by Autonomous Underwater Vehicle (AUV) is desired for efficient investigation. This paper reports about deployment of long-term deployment system based on underwater charging station and evaluation of the system by simulator. It succeeded in docking to the station with 68% probability. As a result of the simulation, this system has the ability to be able to search 110 meters square area every day.</p>

DOI： 10.1299/jsmermd.2017.2p1-f07

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-F07/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In order to realize cooperative behavior in an autonomous robot, it is necessary to have uniform and highly accurate obstacle position information among robots. We aim to improve estimation accuracy by integrating object position estimation data by multiple robots whose error tendency is known in a dynamic environment accompanied by sensor and environment uncertainty.</p>

DOI： 10.1299/jsmermd.2017.2p1-j11

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-J11/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>We developed an image sensing system for an autonomous underwater robot with a benthos sampling function, namely sampling-AUV. The mission of a sampling-AUV consist of following four phases: observation phase (OP), return phase (RP), tracking phase (TP) and sampling phase (SP). For an achievement of the above mission, proposed image sensing system comprises software modules of image acquisition, image enhancement, object detection and image selection, and object tracking. The camera in proposed system acquires an image by intervals of five seconds during OP and RP and of a second during TP. The system completes all processing within image acquisition times by employing high-speed algorithms. We checked operations of proposed system in a pool.</p>

DOI： 10.1299/jsmermd.2017.2a2-g09

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CiNii Research

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In recent years, the introduction of robot technology to the primary industry is very important, and introduction to the agricultural field is also expected. Among them, tomatoes have a long harvesting work time and high labor load. Therefore, automation of harvesting by robots is desired. In this research, we are targeting tomato production facilities with large-scale infrastructure. We are developing tomato harvesting robot aiming at practical application at Hibikinada Greenfarm Co., Ltd.. In this paper, we focused on end effector for harvesting tomato. When harvesting tomatoes, it need to have a stem end. In the previous study, it was pluck a tomato from a stem, but stem end took off from tomatoes. In order to harvest a tomato from cluster with stem end, we developed an end effector using suction mechanism and cutting mechanism.</p>

DOI： 10.1299/jsmermd.2017.1a1-d06

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_1A1-D06/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>In RoboCup Soccer Middle Size League, strategy and behavior is improved annually. In recent years, the pass behavior has been required as cooperative behavior of multiple robots. Also, the kick power needs to be changed according to the distance to the goal to broaden the range of strategy. When doing the pass behavior it is necessary to use with the trajectory of ball which the receiver robot is easy to receive. However, our current kick device on our team can’t kick a suitable kick for pass behavior. In this research, we will develop a mechanism to lob and grounders shooting, aiming to realize the pass behavior and expand the range of strategy.</p>

DOI： 10.1299/jsmermd.2017.2p1-k08

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_2P1-K08/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Japan is a forestry country where forests account for about 70% of the land, and introduction of robots is expected in the field of forestry. However, there is already a method of measuring height using aircraft and laser scanner, but the diameter of breast height is investigated by human hands despite the lack of personnel. Therefore, in this research, we propose a trees diameter measurement system using multi rotor helicopter. We aim to stably fly through the forest and measure the breast height diameter of trees in the forest. We propose a tree detection algorithm using LRF data.</p>

DOI： 10.1299/jsmermd.2017.1a1-c04

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2017/0/2017_1A1-C04/_pdf

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/SCIS-ISIS.2016.0115

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DOI： 10.1109/SCIS-ISIS.2016.0118

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DOI： 10.1109/SCIS-ISIS.2016.0117

Scopus

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DOI： 10.1109/OCEANS.2016.7761471

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Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.neunet.2016.05.002

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DOI： 10.1109/OCEANSAP.2016.7485453

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DOI： 10.1109/OCEANSAP.2016.7485507

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2015.12.17  -  2015.12.20

DOI： 10.1109/ICIINFS.2015.7399032

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>This paper presents a novel ripe tomato fruit detection method within a tomato cluster, as a part of behavior strategy of tomato harvesting robot. Proposed method uses infrared images and specular reflection based on the optical characteristic of tomatoes. The fruits of the tomato clusters are detected separately on the captured infrared images, searching the strong response at the center of fruits caused by specular reflection. To recognize the ripe tomatoes from the unripe fruits and other background objects, RGB images were used. The method was evaluated using infrared and RGB images captured by Xbox One Kinect sensor in a greenhouse environment. The result shows the detection accuracy of 88.1 percent of the proposed method.</p>

DOI： 10.1299/jsmermd.2016.2a1-08b1

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_2A1-08b1/_pdf

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>The autonomous Underwater Vehicles (AUVs) are developed to contribute various science filed such as oceans biology, geology by deep-sea observation. The deep-sea observation by AUV provides various information such as lifestyle of deep-sea creature, volcano of deep-sea bottom, etc. by photographing image. Next mission using AUVs is required to sample targets such as creature, mud or stone in deep-sea floor. For success of this mission, AUV needs supports by researcher in support ship. However, underwater communication based on acoustic has less density compared to electronic. In this research, we proposed a method of image compression and reconstruction for acoustic communication. And we evaluated reconstruction image by Structural similarity.</p>

DOI： 10.1299/jsmermd.2016.1a1-16b7

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CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_1A1-16b7/_pdf

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Robots for agriculture are still on developing phase. On the other hand, in the agriculture field of Japan, is progressing and aging and depopulation of the producer, the labor shortage due to lack of successors has become a serious problem. The authors organized a Tomato Robot Competition Committee for accelerating developing in agrirobot. In this competition, to foster the next generation of Agri-robot developer, we set up a junior department in order to nurture the robot developers that can be active in the real field. In this page, we reported an introduction about the robot education in the Junior department, to verify wether it is possible to obtain any kind of effect as the robot contest.</p>

DOI： 10.1299/jsmermd.2016.2p2-17b3

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_2P2-17b3/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Autonomous Underwater Vehicles (AUV) is one of the key technologies for deep ocean research. However AUV cannot work long time due to battery capacity. To solve this problem, a noncontact power supply is required for AUV to conduct observations for extended durations. In this study, we use resonant energy transfer method which has a wide transmission distance. We report results of the performance evaluation in water environment.</p>

DOI： 10.1299/jsmermd.2016.1p1-17a6

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_1P1-17a6/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Underwater robots are employed to marine organisms' research in ultimate environments. In this study, we aim to do automation of marine organisms sampling by autonomous underwater vehicle with a manipulator. We developed a manipulator to pick up deep-sea benthic organisms. The developed manipulator is driven by a master-slave cylinder type hydraulic driven system. Moreover, the manipulator's joints are actuated by hydraulic cylinder, and linear motion of the cylinder is converted to rotational motion by a motion conversion cam-mechanism. This control system was integrated by MATLAB/Simulink. So we adopted Stateflow (this is a toolbox for Simulink) in the high level control layer.</p>

DOI： 10.1299/jsmermd.2016.1a1-17a3

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_1A1-17a3/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Underwater is a challenging work environment with high risks for human beings. One of the needs of the robot, the development of robots working in water extreme environment is expected. Autonomous Underwater Vehicles (AUVs) are suitable for a wide range of search mission without restrictions from power cable, AUVs can move freely in every direction. In this research, we have developed a SSBL acoustic positioning system for underwater robot. Also we report the experimental results of acoustic positioning.</p>

DOI： 10.1299/jsmermd.2016.1a1-17b2

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_1A1-17b2/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>A multirotor helicopter is a flight robot which can hover, take off, fly, and land in small areas. Recently, multirotor helicopters are getting a lot of attention for information gathering in disaster areas and photogrammetric measuring. They have some drawbacks such as a short duration of flight and a risk of confliction during multi vehicle operation. This paper deals with the formation flight control system for multirotor helicopters that can inspect a wide area in a short time. Practical experiments show that the photogrammetric measuring by using proposed formation flight is more suitable for practical use than the measuring by single vehicle.</p>

DOI： 10.1299/jsmermd.2016.1a1-04a4

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_1A1-04a4/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>Action and strategy of the robots is sophisticated in RoboCup soccer middle sized league. Concerted action by multiple robots depends on the circumstances of the operation. Behavioral algorithm that can handle dynamic changing environments is necessary. We aim to realize the ball passing behavior in concerted action. We report on the developing of receive position selection map.</p>

DOI： 10.1299/jsmermd.2016.2p2-17a4

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_2P2-17a4/_pdf

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>RoboCup is an international join project to promote fields such as Artificial Intelligent (AI), robotics, and related field. It is an attempt to apply AI and Intelligent robotics research by providing standard problems where a wide variety of technologies can be integrated and examined. In RoboCup, soccer game is selected as a main topic of research, aiming at innovations to be applied for socially significant problems and industries in the future. We also have organized RoboCup team “Hibikino-Musashi” for Middle-Size League soccer competition. In this paper, the control and verification experiments of the ball operation at the time of ball dribbling is described.</p>

DOI： 10.1299/jsmermd.2016.2p2-17a7

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_2P2-17a7/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>We are involved in a research of composing a self-positioning system of AGV(Automated Guided Vehicle). This system has two components, that are saliency detection part and machine learning part. We report the process of the latter of the two. We use SVM(Support Vector Machine) to execute the machine learning of landmark images. To use SVM, We extracted SURF(Speed-Up Robust Features) features from landmark images, and grouped them depending their similarity. The centroid of each cluster is treated as VW (Visual Words). Thus, these images are transformed into VW histograms. By using prior information of landmarks, that have been accumulated during the process of machine learning, the saliency detection regions are focused on the part where learned landmarks are estimated to exist in the environmental images. In this report, We are going to discuss the application of soft margin SVM(Support vector machine) into landmark detection.</p>

DOI： 10.1299/jsmermd.2016.2a1-20a2

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_2A1-20a2/_pdf

Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

<p>A lot of obstacle avoiding algorithm for mobile robot has been proposed. However, consideration of slippage that is caused by wheel load change is lacked in these methods. This causes unstable motion of mobile robot. This research aims to achieve safe motion of mobile robot by considering slippage. We propose obstacle avoidance algorithm for omni-wheeled mobile robot without slippage by load change. This was achieved by extension of Dynamic Window Approach algorithm. Proposal method is tested on RoboCup MSL robot. The result shows 60% reduction of slippage compared with conventional method.</p>

DOI： 10.1299/jsmermd.2016.2p2-17a6

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmermd/2016/0/2016_2P2-17a6/_pdf

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/OCEANS-Genova.2015.7271559

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84957622328&origin=inward

Language：English   Publishing type：Research paper (international conference proceedings)

Porland   Gdynia  

Authorship：Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1201/b18515

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85054399964&origin=inward

Language：English   Publishing type：Research paper (international conference proceedings)

日本   北九州   2014.12.03  -  2014.12.06

DOI： 10.1109/SCIS-ISIS.2014.7044812

Scopus

Language：English   Publishing type：Research paper (international conference proceedings)

日本   北九州   2014.12.03  -  2014.12.06

DOI： 10.1109/SCIS-ISIS.2014.7044782

Scopus

Language：English   Publishing type：Research paper (international conference proceedings)

日本   札幌   2014.09.09  -  2014.09.12