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

China   Nantong   2025.08.24  -  2025.08.26

DOI： 10.1007/978-981-95-4821-7_28

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

Japan   Tokyo   2026.01.13  -  2026.01.16

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

Japan   Osaka   2025.11.26  -  2025.11.28

A Floating Cyber-Physical System (F-CPS) has been proposed to facilitate the flexible use of Spatio-Temporal Data (STD) by retaining it within a specific area where it is generated. We have developed a Spatio-Temporal Data Retention System (STD-RS) that efficiently disseminates STD within an F-CPS by using broadcast communication. Our previous research proposed a transmission control method for outdoor environments based on neighboring node density. However, for many real-world services, STD-RS must also operate in indoor environments. This study proposes and experimentally evaluates a new transmission control method tailored for indoor environments.

DOI： 10.34385/proc.94.P3-36

Kyutacar

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

Japan   Osaka   2025.11.26  -  2025.11.28

We propose to develop a novel network system that leverages interior of metal pipes within buildings as propagation paths for wireless signals. By enabling signal transmission through these pipes, the system aims to extend wireless coverage areas using a small number of access points. This paper evaluates the impact of metallic obstacles placed inside pipes on communication performance through practical experiments based on the IEEE 802.11 WLAN.

DOI： 10.34385/proc.94.P1-34

Kyutacar

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

Philippines   Manila   2025.11.25  -  2025.11.27

Starlink by SpaceX is a promising Low-Earth-Orbit (LEO) satellite constellation service. However, communications over Starlink are disrupted periodically due to handover at the fixed timings of 12th, 27th, 42nd, and 57th seconds for each minute. This periodic handover incurs unnecessary retransmissions, which place a burden on the network and degrade TCP performance. In order to overcome this degradation, this paper proposes a feasible and LEO satellite-friendly TCP congestion control. Our proposal has two main strategies: 1) transmission freeze and 2) cwnd freeze during handover. These strategies are applied to CUBIC and BBRv1 and implemented as a kernel module, making them deployable in the wild. In the real network with Starlink, our proposal dramatically reduced retransmissions and is thus LEO satellite-friendly. Our proposal also improves throughput and file downloading time.

DOI： 10.1145/3763400.3763453

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

Taiwan   Taichung   2025.09.03  -  2025.09.05

Low-Power Wide-Area (LPWA) provides long-range, energy-efficient communication for IoT devices. Previous studies have shown that the IP2LoRa module enables TCP/IP communication over Private LoRa, one of the LPWA technologies. Dynamic modification of their transmission control is difficult because TCP and UDP are implemented in kernel space. To solve this issue, we utilize QUIC, a new transport protocol implemented in user space, to enable communication over Private LoRa using IP2LoRa, and evaluate its performance. Preliminary experiments revealed that packet loss inevitably occurs during the handshake phase due to the half-duplex nature of LoRa communication, resulting in performance degradation. To address this issue, this study proposes an adaptive delayed ACK strategy that delays ACK transmission during the handshake and then sends back multiple ACKs in batches. We verify the effectiveness of the proposed method through experiments using actual equipment. Experimental results show that the proposed method eliminates packet loss during the handshake and shortens the communication time by about 50%.

DOI： 10.1007/978-3-032-05781-5_23

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

Taiwan   Taichung   2025.09.03  -  2025.09.05

Underwater RF communication suffers from unstable links and limited transmission range, which poses significant challenges for end-to-end data delivery in Delay Tolerant Networks (DTNs). To address this, we propose a redundant packet assignment method that estimates packet loss based on received signal strength(RSS) and dynamically adjusts the redundancy level using Reed–Solomon coding. Each node periodically transmits beacons, and RSS values are propagated through the network to estimate the minimum signal strength toward the destination. Based on this, the source node determines the number of redundant packets to attach. We implemented the method on Raspberry Pi devices and evaluated its effectiveness in a land-based experimental environment that assumes underwater conditions by inducing packet loss at defined RSS thresholds. The results show that the proposed method improves packet delivery ratios under varying link qualities and uses fewer packets than fixed-redundancy schemes when possible. These results suggest that RSS-based redundancy control can enhance the robustness and efficiency of DTN communication in underwater RF environments.

DOI： 10.1007/978-3-032-05781-5_25

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

Japan   Kyoto   2025.10.14  -  2025.10.16

This study proposes a system for constructing and operating information infrastructure in evacuation shelters during disasters using satellite constel-lation services, particularly Starlink. The proposed system comprises three core functions: communication optimization, network status monitoring, and evacuation shelter condition monitoring. We developed a prototype "Communication Box" to simplify the deployment, featuring a Raspberry Pi-based Wi-Fi router with a touchscreen display.
The system enables the real-time visualization of Starlink connectivity, communication perfor-mance metrics, and the operational status of evacuation sites. To monitor evacuation shelter activities while maintaining privacy, we evaluated three technologies: web cameras, depth sensors, and Wi-Fi received signal strength indicator-based methods. Experimental results demonstrate that modern TCP algorithms, such as BBR, outperform traditional algorithms re-garding satellite-induced latency and variability. We discuss the implemen-tation challenges and propose methods to mitigate Starlink's handover dis-ruptions through transport-layer tuning and packet buffering.

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

Japan   Tokushima   2025.07.12  -  2025.07.18

Kyutacar

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

Portugal   Lisbon   2025.07.08  -  2025.07.11

With the spread of the Internet, a wide variety of applications are communicating with each other. Active Queue Management (AQM) has long been studied, but recent advances in programmable data planes have facilitated its implementation and consequently revitalized research in AQM. MTQ/QTL are AQM implementations evaluated in P4 networks; however, these algorithms suffer from fairness issues when multiple flows compete along the same path. To address this problem, we propose the Multi-Queue MTQ/QTL method, which leverages multi-queueing and assigns queues based on whether a flow has experienced queueing delays, with the aim of improving per-flow fairness.

DOI： 10.1109/ICUFN65838.2025.11169849

Kyutacar

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

Portugal   Lisbon   2025.07.08  -  2025.07.11

Congestion control for transport protocols affects end to end communication quality. Two congestion control algorithms (CCAs) have been mainstream in transport protocols: one is CUBIC, a standard feature in Windows OS and Linux OS, and the other is BBR, developed by Google. Previous studies have reported that when these different CCAs compete, the performance of each communication flow becomes unfair depending on the environment of intermediate devices. Therefore, in this study, we propose a method to identify the type of CCA in intermediate devices and perform different relay controls for each CCA using Programmable Data-Plane Network (PDPN). This research aims to improve the overall communication performance of the network and the fairness among flows.

DOI： 10.1109/ICUFN65838.2025.11169827

Kyutacar

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

Portugal   Lisbon   2025.07.08  -  2025.07.11

In modern society, where labor shortages are becoming increasingly severe, there is a growing demand for efficient monitoring and inspection operations that can reduce the need for human labor. As a result, autonomous robotic systems have gained significant attention, with many companies and local governments actively conducting experiments and trials. However, relying on wireless communication for robot operations presents challenges in terms of real-time performance and communication stability, due to limitations in communication range and bandwidth. In this study, we utilize wireless LAN standards operating across three frequency bands-920 MHz, 2.4 GHz, and 5 GHz-to deploy autonomous mobile robots. Based on throughput and RSSI measurements, we propose a robot monitoring system that ensures efficient and reliable data transmission by dynamically switching wireless interface and optimizing video methods.

DOI： 10.1109/ICUFN65838.2025.11169934

Kyutacar

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

Portugal   Lisbon   2025.07.08  -  2025.07.11

The Spatio-Temporal Data-Retention System (STDRS) disseminates and retains spatio-temporal data (STD) within a specific area using user device mobility and wireless communication. Conventional STD-RS employs broadcasting to uniformly distribute data without queries, which can lead to redundant transmissions and unreliable delivery. To address this, we propose incorporating Information-Centric Networking (ICN) into STDRS, enabling content-based data retrieval that reduces unnecessary dissemination while ensuring access to relevant information.

DOI： 10.1109/ICUFN65838.2025.11169949

Kyutacar

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

Portugal   Lisbon   2025.07.08  -  2025.07.11

The rapid advancement in the use of IoT devices through digitalization is driving the development of network environments across various settings. In particular, the demand for wireless LANs in building networks is increasing due to their low installation and operational costs. Nevertheless, a single access point often struggles to provide full indoor coverage due to structural obstructions such as walls. Therefore, this paper proposes a new network system that utilizes the interior of metal pipes, which are part of existing building infrastructure, as radio wave propagation paths. This aims to expand communication coverages within buildings and establish a highly convenient wireless LAN network. However, communication using metal pipes is expected to exhibit unique characteristics compared to open-space communication because of reflections and diffractions, necessitating a detailed performance evaluation. In this paper, we evaluate the communication performance in-metal-pipe of IEEE 802.11 wireless LAN with different frequency bands through practical experiments. The experimental results provide insights into wireless network system design by demonstrating the communication stability of various wireless LAN configurations through RSSI measurements.

DOI： 10.1109/ICUFN65838.2025.11169980

Kyutacar

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

Portugal   Lisbon   2025.07.08  -  2025.07.11

Driving the next wave of connectivity, with 5G and soon 6G, the satellite-based Internet of Things (IoT) will become an important part of global coverage. The use of LoRa (Long Range) technology has been an emerging choice especially in CubeSat with limited power and space. Even though LoRa communication is robust against moderate Doppler, for low-earth orbit satellite communication with varying conditions, the limitation of successful communication persists. This paper investigates adaptive LoRa parameter configurations to enhance transmission success rates in satellite IoT communication systems. The proposed approach dynamically adjusts the spreading factor (SF) and bandwidth settings based on the elevation angles of the satellite and its Doppler shifts. A 30-day MATLAB simulation was conducted to emulate satellite passes, ensuring comprehensive coverage of typical sun-synchronous revisit cycle. Performance evaluation considered SF values of 7 to 12 and bandwidths of 31.25 kHz,62.5 kHz, and 125 kHz. The results demonstrate that bandwidth selection significantly influences communication reliability and emphasize the importance of adaptive parameter strategies in mitigating dynamic communication challenges for LoRa-based satellite IoT systems.

DOI： 10.1109/ICUFN65838.2025.11169899

Kyutacar

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

Taiwan   Kaohsiung   2025.07.16  -  2025.07.18

Low earth orbit (LEO) satellite Internet services, such as Starlink, are becoming essential for communication in disaster-hit or infrastructure-limited regions. However, frequent inter-satellite handovers in Starlink often cause temporary disruptions, latency spikes, and packet loss. To address this, we propose StarUDP, a kernel-level solution that predicts handover timing to stabilize UDP communication. Real-world experiments demonstrate improved communication stability and reduced packet loss.

DOI： 10.1109/ICCE-Taiwan66881.2025.11207984

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

Portugal   Lisbon   2025.03.09  -  2025.03.13

Video streaming makes most of Internet traffic nowadays, with most video applications transported over Hypertext Transfer Protocol/Transmission Control Protocol (HTTP/TCP). Being the predominant transport protocol, TCP stack performance in transporting video streams plays an important role, especially with regard to MultiPath Transport Control Protocol (MPTCP) and multiple client device interfaces currently available. One overlooked aspect of multipath transport is the management of all possible paths between sender and receiver endpoints. In this paper, we study the usage of all possible paths created by MPTCP vis a vis video streaming performance on wired networking environments. We show that a fullmesh path usage may result in degraded video streaming performance due to common bottlenecks between paths under a simple (default) path scheduler. We then propose a bottleneck aware path scheduler, and show its superior performance on various multipath scenarios. Our results cover both Bottleneck Bandwidth and Round-trip (BBR) propagation time TCP variant, as well as CUBIC variant in transporting video streams over wired networks. We use network performance level, as well as video quality level metrics to characterize quality of video streaming over TCP variants.

Kyutacar

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

Japan   Matsue, Shimane   2025.03.29  -  2025.03.31

There are few IP unreachable areas outside the Internet coverage by terrestrial or wired link. Low Earth Orbit (LEO) satellite constellations may cover such IP unreachable areas. Starlink by SpaceX (Space Exploration Technologies Corp.), which is a major LEO satellite constellation service, is reported to disrupt communication at the fixed timing due to handover periodically. It is, however, still unclear how periodic communication breakdowns occur and how they affect traditional transport protocols such as TCP and UDP. This paper confirms the periodic communication breakdowns of Starlink and evaluates how TCP and UDP are affected. We have confirmed that handover surely occurs at the fixed interval of 15 seconds and the fixed timing of 12, 27, 42, and 57 seconds for each minute due to handover. We then observed that handover times ranged from 139 ms to 384 ms, which is longer than previously reported. In addition, Starlink may buffer or retransmit packets somewhere in its network, and some packet losses may be avoided.

DOI： 10.1109/ICCT-Pacific63901.2025.11012871

Kyutacar

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

USA   Las Vegas, NV   2025.01.11  -  2025.01.14

The widespread adoption of IoT devices has led to increased sensor data. Among the data, we defined spatiotemporal data (STD) as data that depends on both time and space. We proposed a spatiotemporal data retention system (STD-RS) that uses vehicles to retain and utilize STD within a specific spatial area. However, in STD-RS, errors in vehicle location information can cause data to be transmitted outside the target area. Previously, we proposed a method to detect abnormal vehicles by learning the distance and received signal strength indication (RSSI) of the vehicle and then confirmed that the method can detect abnormal vehicles with an accuracy of approximately 80%. However, the previous method did not consider vehicles that cannot generate features for learning in this paper. Moreover, as the evaluation was conducted in a single (ideal) environment only, the validation of effectiveness in practical environments remains. In this study, we use the sufficiency rate of data necessary for feature generation as an evaluation metric and evaluate how the spatial and quantitative changes in the combination of features for learning impact the sufficiency rate and detection accuracy under practical environments. The simulation evaluation results revealed the factors that affected the sufficiency rate and demonstrated that using the long-term spatial variation of RSSI as a feature improves the detection accuracy in any environment.

DOI： 10.1109/ICCE63647.2025.10930042

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

USA   Las Vegas, NV   2025.01.11  -  2025.01.14

In TCP/IP, there are various types of congestion control algorithms, such as CUBIC and Bottleneck Bandwidth and Round-trip propagation time (BBR). When flows using CUBIC and BBR share a bottleneck link, it has been reported that fairness decreases with the buffer size of the relay node on the bottleneck link. To improve fairness in these circumstances, we have previously proposed a method assigning each congestion control algorithm a separate buffer at the relay node using a programmable data plane. We have also proposed a packet scheduling method, Fair Queuing with Holding Time (FQ-HT), that allows relay nodes to send packets fairly from multiple buffers by setting an appropriate holding time. The appropriate holding time depends on the bandwidth of the bottleneck link and the buffer size of the relay node. However, if the holding time is not set appropriately, the fairness may not be improved or the total throughput may be reduced. In this paper, we propose Fair Queuing with Variable Holding Time (FQ-VHT), which automatically sets the appropriate holding time based on the difference in the number of send packets between the buffers. Emulation experiments showed that FQ-VHT can set an appropriate holding time based on network conditions.

DOI： 10.1109/ICCE63647.2025.10929998

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

Japan   Kitakyushu   2024.11.25  -  2024.11.27

DOI： 10.34385/proc.85.P3-25

Kyutacar

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

Japan   Kitakyushu   2024.11.25  -  2024.11.27

DOI： 10.34385/proc.85.P3-30

Kyutacar

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

Japan   Kitakyushu   2024.11.25  -  2024.11.27

DOI： 10.34385/proc.85.P3-27

Kyutacar

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

Japan   Kitakyushu   2024.11.25  -  2024.11.27

DOI： 10.34385/proc.85.P3-31

Kyutacar

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

2024.11.14  -  2024.11.15

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

2024.11.14  -  2024.11.15

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

2024.11.14  -  2024.11.15

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

2024.11.14  -  2024.11.15

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

2024.11.14  -  2024.11.15

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

India   Greater Noida   2024.11.17  -  2024.11.20

This paper proposes an enhancement for the B5G mobile testbed environment that enables evaluations of the nonterrestrial networks (NTNs) -based systems. In the proposed evaluation environment, harmonizations with NTN and the terrestrial mobile systems are realized by using the reconfigurable testbed facilities that are constructed to evaluate the future possible advancement on the current L5G compliant mobile systems. The proposed NTN harmonized B5G mobile system provides an expanded C-Plane functions by exploiting the NTN’s inherent advantages of service continuity, ubiquity and scalability thereby further enhances the performances of the conventional terrestrial mobile systems. This paper also reports on the experimental results that are obtained on the NICT developed B5G/IoT testbed with high reliability and high elasticity. The experimental results confirm that the proposed NTN harmonized B5G mobile systems provide system performance of both throughput and RTT equivalent to the conventional terrestrial mobile systems without serious degradations owing to such assumed expanded C-Plane functions.

DOI： 10.1109/WPMC63271.2024.10863751

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

Indonesia   Mataram   2024.11.28  -  2024.11.30

The integration of Internet of Things (IoT) technology with satellite communications has reformed global connectivity, especially in remote regions that lack terrestrial infrastructure. Recent advancements in optimizing LoRa parameters for satellite-based IoT communications have boosted research in this field. Building on this foundation, the MicroOrbiter-1 satellite developed by MicroOrbiter Inc. in collaboration with the Kyushu Institute of Technology (Kyutech) enhances LoRa-based IoT capabilities in a 1U CubeSat platform. This paper presents the in-orbit performance evaluation of the MicroOrbiter-1 satellite’s LoRa-based communication system on the 920 MHz frequency band with three Ground Sensor Terminals (GST) located in Kyutech (Japan), Rancabungur (Indonesia) and Vermont (USA). Key performance metrics such as Received Signal Strength Indicator (RSSI), Spreading Factor, and transmission errors, were analyzed across these locations. The results demonstrated the range of -112 dBm to -127 dBm signal strength for successful communication at low spreading factors. Temporal analysis was conducted using the System Tool Kit to categorize the data received from each terminal. While facing the challenges of power limitation and the lack of an attitude control determination system, the findings in the in-orbit performance analysis of the MicroOrbiter-1 satellite provide valuable insights for optimizing LoRa communication for future satellite missions, especially for CubeSats.

DOI： 10.1109/COMNETSAT63286.2024.10862081

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

Canada   Victoria, BC   2024.08.21  -  2024.08.24

Video streaming makes most of Internet traffic nowadays, being transported over Hypertext Transfer Protocol/Transmission Control Protocol (HTTP/TCP). Being the pre-dominant transport protocol, TCP stack performance in transporting video streams has become paramount, specially with regard to MultiPath Transport Control Protocol (MPTCP) innovation and multiple client device interfaces currently available. Recently, Low Orbit Satellite networks have become available as a way to cover remote locations where cellular coverage is spotty at best with Internet access. In this paper, we evaluate video streaming hand-off performance via cellular and LEO links. Such scenario is commonplace in geographical areas where cellular communication is unreliable, such as disaster and conflict torn situations. We provide an extensive analysis of Bottleneck Bandwidth and Round-trip propagation time (BBR) TCP variant, as well as CUBIC when handing off video streams between terrestrial cellular network (5G) and LEO (Starlink) access networks. We use network performance level, as well video quality level metrics to characterize quality of video streaming over TCP variants.

DOI： 10.1109/PACRIM61180.2024.10690202

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

Canada   Victoria, BC   2024.08.21  -  2024.08.24

A wide variety of congestion control algorithms have been developed for the transport protocol of TCP/IP. A related study revealed that the communication performance becomes unfair depending on the buffer length of switches or routers in the end-to-end path when communication flows using CUBIC TCP and Bottleneck Bandwidth and Round-trip propagation time (BBR) compete with each other. Therefore, we propose the fairness improvement method between different types of congestion control in the programmable network by using P4 programming. The proposed method provides multiple queues to each congestion control in the switches or the routers for relaying. The proposed method then assigns incoming TCP flows to those queues for each congestion control algorithm. The congestion control algorithm is determined by P4, which implements a programmable data plane. Three types of packet scheduling are used to ensure fairness when sending packets. We evaluate the effectiveness of the proposed method using the network emulator “mininet” and the communication performance when the queue length of the relaying switch.

DOI： 10.1109/PACRIM61180.2024.10690198

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

Canada   Victoria, BC   2024.08.21  -  2024.08.24

Low Power Wide Area (LPWA) is expected to be a communication technology suitable for the Internet of Things (IoT) due to its features, such as low power consumption, low cost, and long-distance transmission. Since LoRa communication has a trade-off between communication range and transmission rate, its communication performance is inherently varied depending on the surrounding environment. Therefore, in the previous study, we proposed a dynamic parameter control method based on beacon reception characteristics to fixed nodes to provide stable and efficient communication and evaluated its effectiveness. However, since the communication environment for mobile nodes is constantly changing, that method is challenging to contribute to performance improvement for mobile nodes. This paper proposes a dynamic transmission parameter control method for mobile terminal with LoRa communication. The effectiveness of the proposed method is evaluated from the real experiments.

DOI： 10.1109/PACRIM61180.2024.10690200

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

Canada   Victoria, BC   2024.08.21  -  2024.08.24

To promote local production and consumption of Spatio-Temporal Data (STD), we have proposed a Floating Cyber-Physical System (F-CPS) that retains STD and functions (applications) to process and use the STD within a specific area. The F-CPS designed the functions to execute common applications on various types of devices, aiming to accelerate the effective use of STDs. Therefore, the function distributed within the area should be small, and an execution platform for the function does not depend on hardware and operating systems. Furthermore, there is a need for a system to recognize available functions to new users entering the area and deliver them appropriately. In this paper, we propose (1) a compact and portable application execution platform using WebAssembly, and (2) a function Retention System based on the MEC collaborative application delivery method. We evaluate the process of the application execution platform and delivery method in our proposed system using actual equipment. The result of the verification revealed that even when multiple devices retrieve an application simultaneously, the execution of the application could be completed within 2 seconds.

DOI： 10.1109/PACRIM61180.2024.10690196

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

Belgium   Charleroi   2024.10.28  -  2024.10.31

TCP congestion control uses end-to-end delay and packet discard information to control the transmission rate. In the wireless LAN, there is a time lag between TCP congestion control and the transmission rate control of the wireless LAN interfaces, and there is no coordination between the respective controls. Thus, congestion control corresponding to the current state of the wireless network can be achieved by shortening this time lag. Therefore, this paper proposes a method to control the congestion window by detecting changes in the transmission rate of the wireless LAN interfaces. Our proposed method enables to control congestion windows size by using data link layer information, instead of using only transport layer information. This paper verified the effectiveness of the proposed method by network simulator ns-3.40.

DOI： 10.1109/ICNP61940.2024.10858575

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

South Korea   Asan   2024.09.19  -  2024.09.21

The demand for wireless LAN is increasing in network construction within buildings because it has low installation and operational costs. However, it is difficult for a single access point to cover the entire indoor area with wireless communication due to the building structure or walls’ obstruction. Therefore, we focus on the metal pipes installed throughout the building and aim to utilize them as radio propagation paths to construct a wireless LAN network. Communication using metal pipes is expected to exhibit different characteristics from communication in open space because of reflections and diffractions, necessitating a detailed performance evaluation. This paper evaluates the communication performance of IEEE 802.11ax wireless LAN within metal pipes through simulations and practical experiments.

DOI： 10.1007/978-3-031-72322-3_46

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

South Korea   Asan   2024.09.19  -  2024.09.21

With the advancement of Internet of Things (IoT) technology, various types of IoT data are being generated. Among these are spatio-temporal data (STD), which are related to specific times and locations, and STD-RS, which uses vehicles to distribute these data. However, there is a risk of vehicles with location errors distributing data outside the designated area. Previous research proposed a system using a multi-layered blockchain to detect and audit such vehicles, which has been validated through simulations but not yet in real-world settings. This study implements this detection and audit mechanism using smart contracts and a multi-layered blockchain in a real-world setting. We evaluate performance on actual devices, using configurations that closely resemble the simulations. Our method involves storing STD hash values and area information in a smart contract to identify malfunctioning vehicles. To implement this, we utilized Ethereum for smart contract deployment, with Geth as the CUI Ethereum node, and the web3.js library in Node.js for writing to Ethereum blocks. Additionally, we employed Solidity to develop the smart contracts and GraphQL to specify the search range within the blockchain. The results show that as the scale of the data increases, the search time also increases, with real-world implementation reflecting similar characteristics to simulations. Furthermore, we confirmed that the rate of increase in search time per unit of data scale differs between simulations and real-world scenarios due to application variance. The implementation results show linearly increasing search time per data size, concluding equivalent scalability to the simulation.

DOI： 10.1007/978-3-031-72322-3_40

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

South Korea   Asan   2024.09.19  -  2024.09.21

Some types of Internet of Things data depend on the time and location at which they were generated. We refer to such data as spatio-temporal data (STD). To effectively utilize STD, we previously proposed an STD retention system called STD-RS that uses vehicles to retain STD within a specific area. In STD-RS, vehicles autonomously operate based on their location information. However, location information errors at vehicle nodes may lead to STD being distributed outside the target area. This could lead to an increase in packet loss and pose the risk of information leakage. Therefore, this study proposes a method for detecting vehicles with location information errors based on the attenuation of signal strength with distance. Specifically, the distance to vehicle nodes and the received signal strength obtained during STD distribution are collected and stored on multi-access edge computing servers. Machine learning is then applied to this information for detection. Simulations demonstrate that vehicles with location information errors can be detected with an accuracy of approximately 80%.

DOI： 10.1007/978-3-031-72322-3_41

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

South Korea   Asan   2024.09.19  -  2024.09.21

A Floating Cyber Physical System (F-CPS) has been proposed as a region specfic Cyber Physical System (CPS). F-CPS promotes flexible data utilization by retaining Spatio-Temporal Data (STD), which depends on the location and time of data generation, within a specific area. We have proposed a Spatio-Temporal Data Retention System (STD-RS) to deliver STD in the F-CPS. In our previous studies, we assumed that nodes controlled data transmission based on GPS information in outdoor environments. However, F-CPS is also assumed for data retention in indoor environments. In this study, we propose a data transfer control method based on the received signal strength indicator to check its location information without using GPS. Additionally, we conducted experiments in a real environment and demonstrated that the proposed method effectively operates as an STD-RS in indoor environment.

DOI： 10.1007/978-3-031-72322-3_42

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

South Korea   Asan   2024.09.19  -  2024.09.21

Mobile communication networks are expanding. However, when natural disasters happen and communication equipment is damaged, service disruptions can occur and many people cannot use the network. When such disasters happen, it is possible to use long-distance wireless networks such as Low Power Wide Area (LPWA) networks or satellite communication networks as alternative routes. This study focuses on the network between the Beyond 5G core network and the remote host and proposes a resilient network that uses the open RAN (O-RAN) architecture to utilize available communication networks during failures. Additionally, we propose a traffic steering method based on the types of user devices to effectively use available alternative routes and alleviate QoS degradation for users. This paper evaluates the effectiveness of the proposed system through simulations. The simulation results showed that the proposed methods increase the satisfaction rate of flows' requirements.

DOI： 10.1007/978-3-031-72322-3_45

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

DOI： 10.2197/ipsjjip.32.566

Kyutacar

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

USA   Boston, MA   2024.07.10  -  2024.07.11

Low-power wide-area (LPWA) is a major communicaiton technology used in the Internet of Things (Io‘I’), Major sensor networks are constructed using original protocols specific to each LPWA standard and cannot communicate directly with devices connected to the Internet. To enhance the convenience of devices using LPWA, it is necessary to improve their interop-erability with Internet applications with TCP/IP. Previous study have enabled Single-hop TCP/IP communication over Private LoRa. In this study, we construct a multi-hop environment for TCP/IP communication over Private LoRa, and evaluate its performance using both UDP and TCP communication. Previous research has enabled one-to-one communication using UDP and TCP over a Private LoRa interface, an LPWA technology. This study leverages the characteristics of LPWA for ultra-long-distance transmission and implements TCP/IP communication in a multi-hop environment. This paper evaluates the performance of UDP and TCP on actual devices.

DOI： 10.1109/LANMAN61958.2024.10621878

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

IoT-based acoustic data collection systems have been proposed for detecting anomalies in mechanical equipment. However, traditional systems using audible sound do not work well due to interference from various sound sources. To solve this problem, we have previously proposed an ultrasonic data collection system, but the clear and high-quality sound required for anomaly detection results in an increase in data volume. This paper proposes a method for extracting only the necessary frequency band based on the periodicity of the target signal, aiming to reduce the amount of data. Our experiments demonstrate that the proposed method efficiently determines the appropriate frequency band in which the characteristics of the target equipment appear, thereby enabling the amount of data to be reduced by more than 45%.

DOI： 10.2299/jsp.28.129

Kyutacar

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

QUIC is a transport protocol that adds congestion control, retransmission control, and TLS to UDP. QUIC can use the same congestion control algorithms as TCP. In previous work, we have shown that communication performance becomes unfair concerning the buffer size of the shared bottleneck link of two flows, one using CUBIC and the other BBR congestion control algorithms within QUIC. In this study, we improve the communication fairness performance at different bottleneck link buffer sizes by using Round Trip Time (RTT) and Explicit Congestion Notification (ECN) to regulate congestion control aggressiveness when CUBIC and BBR compete within QUIC through actual experiments.

DOI： 10.23919/comex.2024XBL0014

Other Link： https://www.jstage.jst.go.jp/article/comex/13/6/13_2024XBL0014/_article/-char/ja

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

Greece   Athens   2024.03.10  -  2024.03.14

Video streaming makes most of Internet traffic nowadays, being transported over Hypertext Transfer Protocol/Transmission Control Protocol (HTTP/TCP). Being the predominant transport protocol, TCP stack performance in transporting video streams has become paramount, specially with regard to MultiPath Transport Control Protocol (MPTCP) innovation and multiple client device interfaces currently available. Recently, Low Orbit Satellite networks have become available as a way to cover remote locations where cellular coverage is spotty at best with Internet access. In this paper, we evaluate video streaming performance via cellular and LEO links. Such scenario is commonplace in geographical areas where cellular communication is unreliable, such as disaster and conflict torn situations. We provide an extensive analysis of Bottleneck Bandwidth and Round-trip propagation time (BBR) TCP variant, as well as CUBIC when transporting video streams over terrestrial cellular network (LTE) and LEO (Starlink) access networks. We use network performance level, as well video quality level metrics to characterize quality of multipath video streaming over TCP variants.

Kyutacar

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

USA   Honolulu, HI   2024.02.27  -  2024.03.01

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

USA   Las Vegas, NV   2024.01.06  -  2024.01.09

Cyber Physical System (CPS) is a system that accumulates information from physical space, analyzes them in cyberspace, and then feeds back the results. We aim to realize a Floating Cyber Physical System (F-CPS), a regionally distributed CPS. We have proposed a large-capacity spatio-temporal data retention system for delivering data and function (application) in the F-CPS. In a previous work, we proposed a data completeness-aware transmission control and evaluated it by simulation. However, considering the movement of obstacles and fluctuation of radio waves in the real environment, packet loss occurs frequently. Thereby, the system may not be able to have complete data and may not function. In this paper, we proposed a method to recover missing data using redundant packets and evaluated its impact on the entire system by testing it with actual equipment.

DOI： 10.1109/CCNC51664.2024.10454686

Kyutacar

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

USA   Las Vegas, NV   2024.01.06  -  2024.01.09

With the widespread Internet technologies, malware damage also spreads worldwide, making it necessary to address these issues urgently. In some cases, malware-infected terminals use the Domain Name System (DNS) when communicating with the Command and Control (C&C) servers to obtain information for attacks. The previous malware detection focuses on the DNS communication history of malware-infected terminals. However, this method has the problem of poor accuracy in detecting malicious domains when the analysis data is small. This paper proposes a malicious domain detection with the following improvements. The first improvement is adding information on response and time. The second improvement is shortening the query domain names to primary domain names. Further, the proposed method showed improvement in the experiment.

DOI： 10.1109/CCNC51664.2024.10454674

Kyutacar

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

USA   Las Vegas, NV   2024.01.06  -  2024.01.09

IEEE 802.11ah (11ah) is a wireless LAN standard using the 920 MHz band and is expected to be used in the IoT field as one of the Low Power Wide Areas (LPWAs). Many LPWAs share the 920 MHz band and are characterized by low transmission rates but long-range communication. Therefore, there is a high possibility of contending communication in the real-world environment. In this study, we clarify the characteristics of contending communications between 11ah and LoRa according to evaluating the performance using real devices.

DOI： 10.1109/CCNC51664.2024.10454837

Kyutacar

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

USA   Las Vegas, NV   2024.01.06  -  2024.01.09

LPWA (Low Power Wide Area) is expected to be a communication technology suitable for the Internet of Things (loT) because of its features. Since LoRa communication has a trade-off between communication range and transmission rate, performance is inherently varied depending on the surrounding environment. Therefore, to achieve stable and efficient communication performance, it is necessary to set appropriate parameters for LoRa depending on the communication environment between the base station and the terminal. We here propose a method for dynamic control of parameter settings based on reception statistics of beacons. The effectiveness of the proposed method is evaluated from the real experiments.

DOI： 10.1109/CCNC51664.2024.10454734

Kyutacar

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

2023.11.29  -  2023.12.01

DOI： 10.34385/proc.79.P3-9

Kyutacar

Other Link： https://www.ieice.org/cs/icetc/index.html

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

2023.11.29  -  2023.12.01

DOI： 10.34385/proc.79.P3-14

Kyutacar

Other Link： https://www.ieice.org/cs/icetc/index.html

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

USA   Tampa, FL   2023.11.19  -  2023.11.22

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

Iceland   Reykjavik   2023.10.10  -  2024.10.13

QUIC is a transport protocol that adds congestion control, retransmission control, and TLS to UDP. QUIC can use the same congestion control algorithms as TCP. In previous work, when both CUBIC and BBR flows compete within QUIC, we have shown that communication performance becomes unfair with respect to the buffer size of the shared bottleneck link. In this study, we improve the communication performance at different bottleneck link buffer sizes using Round Trip Time (RTT) and Explicit Congestion Notification (ECN) when CUBIC and BBR compete within QUIC through actual experiments.

DOI： 10.1109/ICNP59255.2023.10355640

Kyutacar

Other Link： https://www.scopus.com/record/display.uri?eid=2-s2.0-85182512038&origin=inward&txGid=8dc079f1526b2e98b38b2b443f6116d3

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

Italy   Torino   2023.06.26  -  2023.06.30

DOI： 10.1109/COMPSAC57700.2023.00145

DOI： 10.1109/COMPSAC57700.2023.00145

Kyutacar

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

Italy   Torino   2023.06.26  -  2023.06.30

DOI： 10.1109/COMPSAC57700.2023.00149

DOI： 10.1109/COMPSAC57700.2023.00149

Kyutacar

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

Spain   Barcelona   2023.03.13  -  2023.03.17

Kyutacar

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

USA   Las Vegas, NV   2023.01.08  -  2023.01.11

Spatio-temporal aware IoT applications need to deliver the Spatio-Temporal Data (STD), which depends on geographic location and time, to the users in real-time. We have proposed the STD retention system using crowds of vehicles to promote the immediate distribution and utilization of STDs in geographical proximity to the user. However, when the system retains a Large-size STD (LSTD) consisting of multiple packets such as videos and photos, the packet loss due to channel collisions should be suppressed for effective retention of an LSTD. In this paper, we propose a complementary data transmission control method with collision avoidance for LSTD retention and clarify the effectiveness of our proposed method by simulation.

DOI： 10.1109/CCNC51644.2023.10060769

Kyutacar

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85150663283&origin=inward

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

USA   Las Vegas, NV   2023.01.08  -  2023.01.11

QUIC is a secure, general-purpose transport protocol using congestion and retransmission controls on User Datagram Protocol (UDP). QUIC can use the same congestion control algorithms as Transmission Control Protocol (TCP). Thus, when communication between multiple terminals using QUIC competes, the performance of each terminal depends on the congestion control algorithm adopted by the terminal. In related works, the communication performance was evaluated by simulation when both CUBIC and BBR flows competed in TCP, and the results showed that each communication performance became unfair with the buffer size of the shared bottleneck link. In this study, we verify the communication performance at different bottleneck link buffer sizes when BBR and CUBIC compete through actual experiments.

DOI： 10.1109/CCNC51644.2023.10060682

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85150629349&origin=inward

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

USA   Las Vegas, NV   2023.01.08  -  2023.01.11

IoT data includes Spatio-temporal data (STD) that is needed only at a specific time and place. In our previous research, we have proposed the STD data retention system (STD-RS), aiming to construct a novel architecture for STD distributing in a retention area by vehicles. However, since vehicles may distribute the STD in unexpected locations due to GPS errors or malicious behavior in a real environment. Therefore, we propose a reliability audit mechanism based on multi-layered blockchain managing and analyzing the history of STD distribution and vehicles' behavior in each retention area. Through simulation experiment, we demonstrated that our mechanism detects the malfunction of STD-RS effectively.

DOI： 10.1109/CCNC51644.2023.10059819

Kyutacar

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85150622344&origin=inward

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

USA   Las Vegas, NV   2022.12.14  -  2022.12.16

DOI： 10.1109/CSCI58124.2022.00222

Kyutacar

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

USA   Las Vegas, NV   2022.12.14  -  2022.12.16

DOI： 10.1109/CSCI58124.2022.00196

Kyutacar

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

USA   Las Vegas, NV   2022.12.14  -  2022.12.16

DOI： 10.1109/CSCI58124.2022.00212

Kyutacar

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

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

Kyutacar

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

USA   Lexington, KY   2022.10.30  -  2022.11.02

Low-power wide-area (LPWA) is a major communication technology used in the Internet of Things (IoT). However, since LPWA does not conform to the TCP/IP protocol stack and employs its own unique protocol, it is difficult for sensors equipped with LPWA I/F to connect to the Internet directly. In the present study, to realize general TCP/IP communication on LPWA networks, we construct a TCP/IP network over Private LoRa, and evaluate its communication performance. Moreover, we verify the feasibility of TCP/IP communication over LoRa by using a popular Internet application.

DOI： 10.1109/ICNP55882.2022.9940334

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85142704148&origin=inward

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

Some specific services for Internet of Things, such as real-time map and providing local weather information, depend strongly on geographical time and location. We refer to the data for such service as spatio-temporal data (STD). When STD is used in a query response system similar to conventional Internet services, users not only need to acquire data actively as required, they must also have functions for retrieving data available STD. Therefore, we propose an STD retention system that uses vehicles as information hubs (InfoHubs) for disseminating and retaining the data in a specific area. In our system, InfoHubs diffuse, maintain, and advertise STD over places and times where the STD are strongly dependent, thereby allowing users to receive such data passively within the specific area. Additionally, because STD are associated with a particular space, the system can reduce search costs. We also propose an adaptive transmission control method that each vehicle effectively operates its wireless resources autonomously and STD are retained and distributed efficiently. Finally, we evaluated our proposed method using simulations and clarified that our proposed system is capable of achieving a coverage rate of nearly 100% for STD while reducing the number of data transmissions compared to existing systems.

DOI： 10.1109/TMC.2021.3066438

Kyutacar

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85103149527&origin=inward

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

Albania   Tirana   2022.10.27  -  2022.10.29

With the development and spread of IoT technology, various devices have been connected to networks. Some data generated from IoT devices depends on geographical location and time (Spatio-Temporal Data). The realization of an architecture for "local production and consumption of STDs" can contribute to location-dependent applications, and therefore we have proposed the STD retention system with vehicles. In our previous study, the vehicle controlled the data transmission probability according to the density of the neighboring vehicles in order to reduce the data transmissions. However, since this method requires all vehicles to transmit beacons, it suffers from the excessive beacon collision when the vehicle density becomes high. In this paper, we propose a data transmission control method that realizes STD retention without transmitting beacons. Our simulation results using Luxembourg model demonstrates that the proposed method can achieve high coverage rate while decreasing the number of data transmissions compared with the existing transmission method based on transmission probability control in real environments.

DOI： 10.1007/978-3-031-20029-8_22

Kyutacar

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85141705855&origin=inward

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

Italy   Venice   2022.05.22  -  2022.05.26

Kyutacar

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

DOI： 10.1007/978-981-19-3679-1_18

Kyutacar

Other Link： http://icicc-conf.com/

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

USA   Las Vegas, NV   2022.01.07  -  2022.01.09

DOI： 10.1109/ICCE53296.2022.9730495

Kyutacar

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

USA   Las Vegas   2021.12.15  -  2021.12.17

DOI： 10.1109/CSCI54926.2021.00300

Kyutacar

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

France   Nice   2021.07.18  -  2021.07.22

Kyutacar

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

DOI： 10.1587/transcom.2020CQP0010

Kyutacar

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

DOI： 10.1587/transinf.2020NTL0001

Kyutacar

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

DOI： 10.1587/transinf.2020EDL8088

Kyutacar

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

In IoT era, the growth of data variety is driven by cross-domain data fusion. In this paper, we advocate that “local production for local consumption (LPLC) paradigm" can be an innovative approach in cross-domain data fusion, and propose a new framework, geolocation-centric information platform (GCIP) that can produce and deliver diverse spatio-temporal content (STC). In the GCIP, (1) infrastructure-based geographic hierarchy edge network and (2) adhoc-based STC retention system are interplayed to provide both of geolocation-awareness and resiliency. Then, we discussed the concepts and the technical challenges of the GCIP. Finally, we implemented a proof-of-concepts of GCIP and demonstrated its efficacy through practical experiments on campus IPv6 network and simulation experiments.

DOI： 10.1587/transcom.2020NVI0003

Kyutacar

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

2020.12.02  -  2020.12.04

DOI： 10.34385/proc.63.C3-4

Kyutacar

Other Link： https://www.ieice.org/cs/icetc/index.html

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

2020.12.16  -  2020.12.18

Kyutacar

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

The communications quality of content delivery networks (CDNs), which are geographically distributed networks that have been optimized for content delivery, deteriorates when interflow congestion conditions are severe. Herein, we propose an adaptive server and path switching scheme that is based on the estimated acquisition throughput of each path. We also provide simulation results that show our proposed method can provide higher throughput performance levels than existing methods.

DOI： 10.1587/transinf.2020EDL8045

Kyutacar

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

Portugal   Porto   2020.10.18  -  2020.10.22

Kyutacar

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

Canada   Victoria   2020.08.31  -  2020.09.02

With the development and spread of Internet of Things (IoT) technology, the number of devices connected to the Internet is increasing, and various kinds of data are now being generated from IoT devices. Some data generated from IoT devices depends on geographical location and time. We refer to such data as spatio-temporal data (STD). Since the “local production and consumption" of STD is effective for location-dependent applications, we have proposed a STD retention system using vehicles equipped with storage modules, computing resources, and short-range wireless communication equipment. In this previous system, each vehicle controls the data transmission probability based on the neighboring vehicle density in order to achieve effective data retention. However, since the overhead of beacon messages required for estimation of the neighboring vehicle density becomes a critical problem with the increase in the number of vehicles, thereby preventing the effective data retention. In this paper, we propose a new data transmission control method to realize effective and reliable STD retention without beacon. Simulation results showed that our proposed scheme can achieve effective data retention.

DOI： 10.1007/978-3-030-57796-4_48

Kyutacar

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

Other Link： https://www.ite.or.jp/content/journal/

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

This paper presents the results of verification tests for the application of a 5th generation mobile communication system (5G) to an industrial robot control system, consisting of an industrial robot, a three-dimensional measurement sensor, and a robot controller. First, the configuration of the industrial robot control system to be used for testing was examined. Second, the 5G radio characteristics at two factories were measured. The radio interference to/from devices in operation in the factories and the human shield effect influencing the radio characteristics were also examined in these measurements. In factory automation, it is generally inevitable to spend a long time rearranging the components of the industrial robot control system. From the test results, it was confirmed that the time required could be greatly reduced by replacing wired communication lines with 5G capable systems.

DOI： 10.1541/ieejias.140.314

Kyutacar

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

Korea   Jeju   2019.10.15  -  2019.10.18

DOI： 10.23919/ICCAS47443.2019.8971662

Kyutacar

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

Canada   Victoria, BC   2019.08.21  -  2019.08.23

DOI： 10.1109/PACRIM47961.2019.8985085

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

Canada   Victoria, BC   2019.08.21  -  2019.08.23

DOI： 10.1109/PACRIM47961.2019.8985114

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

Canada   Victoria, BC   2019.08.21  -  2019.08.23

DOI： 10.1109/PACRIM47961.2019.8985124

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

Japan   Oita   2019.09.05  -  2019.09.07

DOI： 10.1007/978-3-030-29035-1_38

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

Japan   Oita   2019.09.05  -  2019.09.07

DOI： 10.1007/978-3-030-29035-1_31

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

DOI： 10.1587/transinf.2018EDL8211

Kyutacar

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

Italy   Rome   2019.06.30  -  2019.07.04

Kyutacar

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

Australia   Sydney   2019.07.03  -  2019.07.05

DOI： 10.1007/978-3-030-22354-0_64

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

DOI： 10.1587/transinf.2018NTP0007

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

DOI： 10.1587/transcom.2018EBP3091

Kyutacar

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

USA   Las Vegas, NV   2018.12.12  -  2018.12.14

DOI： 10.1109/CSCI46756.2018.00163

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

USA   Las Vegas, NV   2018.12.12  -  2018.12.14

DOI： 10.1109/CSCI46756.2018.00200

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

Japan   Tokyo   2018.10.22  -  2018.10.24

DOI： 10.1109/CloudNet.2018.8549521

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

Japan   Tokyo   2018.07.23  -  2018.07.27

DOI： 10.1109/COMPSAC.2018.00124

Kyutacar

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

DOI： 10.1109/LCOMM.2018.2828800

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

Italy   Venice   2018.06.24  -  2018.06.28

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

Japan   Matsue   2018.07.04  -  2018.07.06

DOI： 10.1007/978-3-319-93659-8_90

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

Greece   Athens   2018.04.22  -  2018.04.26

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

Thailand   Bangkok   2017.10.23  -  2017.10.24

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

Thailand   Bangkok   2017.10.23  -  2017.10.24

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

Canada   Victoria   2017.08.21  -  2017.08.23

DOI： 10.1109/PACRIM.2017.8121920

Scopus

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

France   Nice   2017.07.23  -  2017.07.27

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

Italy   Venice   2017.04.23  -  2017.04.27

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

USA   Hawaii   2017.03.13  -  2017.03.17

DOI： 10.1109/PERCOMW.2017.7917524

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

DOI： 10.1587/comex.2017XBL0020

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

Other Link： https://www.j-lis.go.jp/spd/magazine/magazine_BN/J-LIS_H28_BN/jlis1612.html

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

Spain   Barcelona   2016.11.13  -  2016.11.17

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

DOI： 10.1587/comex.2016XBL0158

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

DOI： 10.14923/transcomj.2016IAL0003

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

DOI： 10.1587/transcom.2016SNP0013

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

Germany   Paderborn   2016.07.04  -  2016.07.08

DOI： 10.1145/2938681.2938688

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

Kyutacar

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

USA   San Diego, CA   2015.12.06  -  2015.12.10

DOI： 10.1109/GLOCOM.2014.7417032

Scopus

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

Malta   St. Julians   2015.10.11  -  2015.10.16

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

Canada   Victoria, BC   2015.08.24  -  2015.08.26

DOI： 10.1109/PACRIM.2015.7334856

Scopus

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

Canada   Victoria, BC   2015.08.24  -  2015.08.26

DOI： 10.1109/PACRIM.2015.7334857

Scopus

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

Canada   Victoria, BC   2015.08.24  -  2015.08.26

DOI： 10.1109/PACRIM.2015.7334860

Scopus

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

France   Paris   2015.06.11  -  2015.06.13

DOI： 10.1007/978-3-319-19210-9_9

Scopus

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

DOI： 10.1587/transinf.2014ICP0005

Scopus

CiNii Article

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

DOI： 10.1016/j.jisa.2014.08.003

Scopus

Other Link： http://www.sciencedirect.com/science/article/pii/S221421261400129X

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

China   Dalian   2014.08.24  -  2014.08.27

DOI： 10.1007/978-3-319-11197-1_60

Scopus

Other Link： http://link.springer.com/chapter/10.1007%2F978-3-319-11197-1_60

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

China   Dalian   2014.08.24  -  2014.08.27

DOI： 10.1007/978-3-319-11197-1_62

Scopus

Other Link： http://link.springer.com/chapter/10.1007%2F978-3-319-11197-1_62

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

Sweden   Vasteras   2014.07.21  -  2014.07.25

DOI： 10.1109/COMPSAC.2014.49

Scopus

Other Link： http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6899282

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

Spain   Seville   2014.06.22  -  2014.06.26

Other Link： http://www.thinkmind.org/index.php?view=article&articleid=internet_2014_1_40_40043

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

Belgium   Hasselt   2014.06.02  -  2014.06.05

DOI： 10.1016/j.procs.2014.05.546

Scopus

Other Link： http://www.sciencedirect.com/science/article/pii/S1877050914007467

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

France   Chamonix   2014.04.20  -  2014.04.24

Other Link： https://www.thinkmind.org/index.php?view=article&articleid=energy_2014_3_50_30081

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

France   Nice   2014.02.23  -  2014.02.27

Other Link： http://www.thinkmind.org/index.php?view=article&articleid=icn_2014_5_20_30027

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

Thailand   Phuket   2014.02.10  -  2014.02.12

DOI： 10.1109/ICOIN.2014.6799734

Other Link： http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6799734

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

Germany   Goettingen   2013.10.07  -  2013.10.10

DOI： 10.1109/ICNP.2013.6733623

Scopus

Other Link： http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6733623

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

Canada   Victoria, BC   2013.08.27  -  2013.08.29

DOI： 10.1109/PACRIM.2013.6625486

Scopus

Other Link： http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6625486

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

Korea   Incheon   2013.08.21  -  2013.08.22

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

France   Nice   2013.07.21  -  2013.07.26

Other Link： http://www.thinkmind.org/index.php?view=article&articleid=internet_2013_1_40_30096

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

Japan   Kyoto   2013.07.22  -  2013.07.26

DOI： 10.1109/COMPSACW.2013.80

Other Link： http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6605856

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

Spain   Barcelona   2013.03.25  -  2013.03.28

DOI： 10.1109/WAINA.2013.180

Scopus

Other Link： http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6550460

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

DOI： 10.1587/transinf.E96.D.238

Scopus

CiNii Article

Other Link： http://search.ieice.org/bin/summary.php?id=e96-d_2_238

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

France   Besancon   2012.11.20  -  2012.11.23

DOI： 10.1109/GreenCom.2012.92

Scopus

Other Link： http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6468370

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

Canada   Victoria, BC   2012.11.12  -  2012.11.14

DOI： 10.1109/BWCCA.2012.53

Scopus

Other Link： https://ieeexplore.ieee.org/document/6363049?arnumber=6363049

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

USA   Clearwater, FL   2012.10.22  -  2012.10.25

DOI： 10.1109/LCN.2012.6423625

Scopus

Other Link： http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6423625

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

Turkey   Izmir   2012.07.16  -  2012.07.20

Other Link： http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=6305260

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

Italy   Venice   2012.06.24  -  2012.06.29

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

Japan   Miyazaki   2012.03.04  -  2012.03.07

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

Other Link： http://search.ieice.org/bin/summary.php?id=j95-b_2_219&category=B&lang=J&year=2012

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

DOI： 10.1587/transinf.E95.D.542

Scopus

CiNii Article

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

Japan   Fukuoka   2011.11.30  -  2011.12.02

DOI： 10.1109/INCoS.2011.134

Scopus

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

Germany   Bonn   2011.10.04  -  2011.10.07

DOI： 10.1109/LCN.2011.6115178

Scopus

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

Canada   Victoria, BC   2011.08.23  -  2011.08.26

DOI： 10.1109/PACRIM.2011.6032966

Scopus

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

Canada   Victoria, BC   2011.08.23  -  2011.08.26

DOI： 10.1109/PACRIM.2011.6032961

Scopus

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

Canada   Victoria, BC   2011.08.23  -  2011.08.26

DOI： 10.1109/PACRIM.2011.6032960

Scopus

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

Canaca   Victoria, BC   2011.08.23  -  2011.08.26

DOI： 10.1109/PACRIM.2011.6032951

Scopus

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

Germany   Munich   2011.07.18  -  2011.07.18

DOI： 10.1109/SAINT.2011.96

Scopus

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

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

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

USA   Las Vegas, NV   2011.01.09  -  2011.01.12

DOI： 10.1109/CCNC.2011.5766624

Scopus

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

The Netherlands Antilles   St. Maarten   2011.01.23  -  2011.01.28

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

USA   Miami, FL   2010.12.10  -  2010.12.10

DOI： 10.1109/GLOCOMW.2010.5700176

Scopus

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

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

Japan   Fukuoka  

DOI： 10.1109/TENCON.2010.5686126

Scopus

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

Greece   Thessaloniki  

DOI： 10.1109/INCOS.2010.61

Scopus

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

Japan   Fukuoka  

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

USA   Denver, CO   2010.10.11  -  2010.10.14

DOI： 10.1109/LCN.2010.5735755

Scopus

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

DOI： 10.1587/transcom.E93.B.501

Scopus

CiNii Article

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

USA   Las Vegas, NV   2010.01.09  -  2010.01.12

DOI： 10.1109/CCNC.2010.5421654

Scopus

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

USA   Honolulu, Hawaii   2009.12.04  -  2009.12.04

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

Switzerland   Zurich   2009.10.20  -  2009.10.23

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

Canada   Victoria, BC   2009.08.23  -  2009.08.26

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

Canada   Victoria, BC   2009.08.23  -  2009.08.26

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

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

USA   Seattle, WA   2009.07.20  -  2009.07.24

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

USA   Seattle, WA   2009.07.20  -  2009.07.24

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

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

京都   2009.05  -  2009.05

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

Thailand   Chiang Mai   2009.01  -  2009.01

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

Austria   Vienna   2008.12  -  2008.12

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

主要雑誌

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

Germany   Garmisch-Partenkirchen   2008.01  -  2008.01

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

France   French Riviera   2007.08.26  -  2007.08.31

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

Korea   Jeju   2006.07.09  -  2006.07.13

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

USA   Boston, Massachusetts   2005.10.24  -  2005.10.25

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

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

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

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

USA   2003.11.17  -  2003.11.19

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

Canada   Victoria, B.C.   2003.08.28  -  2003.08.30

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

Canada   2003.08.28  -  2003.08.30

Language：English   Publishing type：Research paper (other academic)

Xi'an, China   2003.03.27  -  2003.03.29

Language：English   Publishing type：Research paper (other academic)

Language：English   Publishing type：Research paper (other academic)

Orlando, Florida, USA   2003.01.27  -  2003.01.31

Language：English   Publishing type：Research paper (other academic)

Singapore   2002.11.25  -  2002.11.28

Language：English   Publishing type：Research paper (other academic)

Taipei, Taiwan   2002.11.17  -  2002.11.21

Language：English   Publishing type：Research paper (other academic)

Language：English   Publishing type：Research paper (other academic)

Language：English   Publishing type：Research paper (other academic)

Boston, Massachusetts, USA   2002.07.29  -  2002.07.30

Language：English   Publishing type：Research paper (other academic)

Pisa, Italy   2002.05.19  -  2002.05.24

Language：English   Publishing type：Research paper (other academic)

Nara, Japan   2002.01.28  -  2002.02.01

Language：English   Publishing type：Research paper (other academic)

Language：English   Publishing type：Research paper (other academic)

San Antonio, Texas, USA   2001.11.25  -  2001.11.29

Language：English   Publishing type：Research paper (other academic)

Victoria, B.C., Canada   2001.08.26  -  2001.08.28

Language：English   Publishing type：Research paper (other academic)

Victoria, B.C., Canada   2001.08.26  -  2001.08.28

Language：English   Publishing type：Research paper (other academic)

Denver, Colorado, USA   2001.08.20  -  2001.08.24

Language：English   Publishing type：Research paper (other academic)

L'Aquila, Italy   2001.08.06  -  2001.08.12

Language：English   Publishing type：Research paper (other academic)

Colmar, France   2001.07.09  -  2001.07.13

Language：English   Publishing type：Research paper (other academic)

Event date： 2026.06.17 - 2026.06.18   Language：Japanese  

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Event date： 2026.06.15 - 2026.06.16   Language：Japanese  

Other Link： https://www.ieice.org/cs/hcl/jpn/program/202606-2/

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Other Link： https://www.ieice.org/cs/hcl/jpn/program/202606-2/

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Other Link： https://www.ieice.org/cs/hcl/jpn/program/202606-2/

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Other Link： https://www.ieice.org/cs/hcl/jpn/program/202606-2/

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Other Link： https://www.ieice.org/cs/hcl/jpn/program/202606-2/

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Other Link： https://www.ipsj-kyushu.jp/page/ronbun/hinokuni/1015/Papers/B-1-3.pdf

Event date： 2026.01.26 - 2026.01.28   Language：Japanese  

Event date： 2025.12.18 - 2025.12.19   Language：Japanese  

Event date： 2025.11.19 - 2025.11.20   Language：Japanese  

Event date： 2025.11.19 - 2025.11.20   Language：Japanese  

Event date： 2025.11.04   Language：English  

To expand wireless LAN coverage areas at low cost, we examined the feasibility of utilizing existing metal pipes within buildings. By radiating radio waves inside the pipe enables network configuration with a small number of access points. This paper evaluated IEEE 802.11 wireless LAN communication performance in environments containing metallic objects inside a pipe, through practical experiments at 2.4 and 5 GHz. Results show that even with 83% of the pipe cross section blocked, RSSI and throughput showed no significant degradation. These results demonstrate the effectiveness and potential of utilizing metal pipes for wireless LAN systems.

Event date： 2025.11.04   Language：English  

A Floating Cyber-Physical System (F-CPS) has been proposed to promote flexible data utilization by retaining Spatio-Temporal Data (STD), which depends on the location and time of data generation, and the functions within the specific area. In this study, we constructed a mechanism that enables wide-area interconnection of F-CPS deployed across multiple regions and mutual utilization of STD, and experimental results demonstrated the effectiveness of utilizing STD on the F-CPS platform.

Event date： 2025.09.29 - 2025.10.01   Language：Japanese  

Event date： 2025.09.29 - 2025.10.01   Language：Japanese  

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Event date： 2025.09.08 - 2025.09.12   Language：Japanese  

Event date： 2025.07.28   Language：Japanese  

Other Link： https://www.iot.ipsj.or.jp/meeting/70-program/

Event date： 2025.06.23 - 2025.06.24   Language：Japanese  

Event date： 2025.06.23 - 2025.06.24   Language：Japanese  

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Other Link： https://confit.atlas.jp/guide/event/jcmi2024/session/3E07-11/tables?TxYJmxHXju

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Event date： 2024.11.11 - 2024.11.12   Language：Japanese  

Event date： 2024.10.26 - 2024.10.27   Language：English   Country：Taiwan, Province of China  

Event date： 2024.10.26 - 2024.10.27   Language：English   Country：Taiwan, Province of China  

Event date： 2024.10.26 - 2024.10.27   Language：English   Country：Taiwan, Province of China  

Event date： 2024.10.26 - 2024.10.27   Language：English   Country：Taiwan, Province of China  

Event date： 2024.10.26 - 2024.10.27   Language：English   Country：Taiwan, Province of China  

Event date： 2024.09.10 - 2024.09.13   Language：Japanese  

Other Link： https://pub.confit.atlas.jp/ja/event/society2024/presentation/B-16-16

Event date： 2024.09.10 - 2024.09.13   Language：Japanese  

Other Link： https://pub.confit.atlas.jp/ja/event/society2024/presentation/B-16-26

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Other Link： https://pub.confit.atlas.jp/ja/event/society2024/presentation/B-16-07

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Other Link： https://pub.confit.atlas.jp/ja/event/society2024/presentation/B-16-04

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