研究者詳細 - 野林　大起

論文 - 野林　大起

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Development of Vehicle Management System using Location Data Collected by 920MHz LoRa 査読有り

Nobayashi D., Niwa Y., Tsukamoto K., Ikenaga T.

Proceedings - 2020 International Conference on Computational Science and Computational Intelligence, CSCI 2020 208 - 209 2020年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The MaaS (Mobility as a Service), which collects, analyzes, and utilizes various data obtained various types of vehicles, is expected to solve various problems about traffic jams, autonomous driving, social community, etc. In this paper, we propose the vehicle management system at a low cost and effecivery using LoRa and Wi-Fi communication. Furthermore, we propose the application to estimate the arrival time assuming the use by a rental car company. The effectiveness of the proposed method is evaluated through demonstration experiments.

DOI： 10.1109/CSCI51800.2020.00042

Scopus

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Adaptive Server and Path Switching for Content Delivery Networks 査読有り

Nishimuta H., Nobayashi D., Ikenaga T.

IEICE Transactions on Information and Systems ( 一般社団法人電子情報通信学会 ) E103D ( 11 ) 2389 - 2393 2020年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 The Institute of Electronics, Information and Communication Engineers 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

Scopus

CiNii Article

CiNii Research

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Handoff Characterization of Multipath Video Streaming 査読有り国際誌

Dirceu Cavendish, Kazuya Fujiwara, Shinichi Nagayama, Daiki Nobayashi, Takeshi Ikenaga

The Twelfth International Conference on Evolving Internet (INTERNET 2020) 2020年10月

Station-centric Access Point Selection Method for Heterogeneous Wi-Fi Environment 査読有り国際誌

Shohei Arakaki, Kazuya Tsukamoto, Daiki Nobayashi

IEEE Consumer Communications & Networking Conference (CCNC) 2020 2020年01月

On-demand transmission interval control method for spatio-temporal data retention 査読有り

Yamasaki S., Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Advances in Intelligent Systems and Computing 1035 319 - 330 2020年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Springer Nature Switzerland AG 2020. With the development and the spread of Internet of Things (IoT) technologies, various types of data are generated for IoT applications anywhere and anytime. We defined such data that depends heavily on generation time and location as Spatio-Temporal Data (STD). In the previous works, we have proposed the data retention system using vehicular networks to achieve the paradigm of “local production and consumption of STD.” The system can provide STDs quickly for users within a specific location by retaining the STD within the area. However, the system does not consider that each STD has different requirements for the data retention. In particular, the lifetime of the STD and the diffusion time to the whole area directly influence to the performance of data retention. Therefore, we propose a dynamic control of data transmission interval for the data retention system by considering the requirements. Through the simulation evaluation, we found that our proposed method can satisfy the requirements of STD and maintain a high coverage rate in the area.

DOI： 10.1007/978-3-030-29035-1_31

Scopus

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Transmission control method to realize efficient data retention in low vehicle density environments 査読有り国際誌

Goto I., Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Advances in Intelligent Systems and Computing 1035 2020年01月

Path Switching Schedulers for MPTCP Streaming Video 査読有り

Nagayama S., Cavendish D., Nobayashi D., Ikenaga T.

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019年08月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. Recent developments on multipath transport protocols have allowed video streaming transmissions over multiple interfaces, improving session reliability as well as bandwidth performance. One important aspect of multipath transport is the selection of paths on a packet by packet basis. In particular, path switching may cause head of line blocking effects that may impact video rendering. In this work, we analyze the impact of path switching on multipath video streaming, and propose new path schedulers aimed at reducing path switching. We utilize network performance measures, as well as video quality metrics, to characterize new schedulers' performance improvements and interactions between network and application layers of video streams for various network scenarios.

DOI： 10.1109/PACRIM47961.2019.8985114

Scopus

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Dynamic A-MPDU adaptation method for airtime fairness in channel bonding-ready WLANs 査読有り

Shimizu Y., Nobayashi D., Tamura H., Tsukamoto K.

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019年08月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. Channel bonding is a technology to increase the transmission rate by bundling and using multiple continuous channels. However, the communication performance is likely to degrade frequently due to the channel competition caused by the rapid increase of the wireless LAN devices. Dynamic channel bonding is expected to become the mainstream in the future from the viewpoint of efficient channel utilization even under the severe competitive condition. However, since the implementation of the dynamic channel bonding to real PC and simulator is in the preliminary stage, the detailed performance investigation has not been carried out. None of existing studies examines the performance of the dynamic channel bonding at the frame level with CSMA/CA functions under the diverse channel competition condition. In this study, we first examine the performance of the dynamic channel bonding with CSMA/CA functions through theoretical approach (2 M/M/1/K) from the view point of frame level. In addition, we then implement the channel bonding mechanism into the Scenargie simulator and then verify its effectiveness through the comparison between simulation results and theoretical ones. Simulation results show that the dynamic channel bonding is suffering from the performance degradation due to the performance anomaly problem caused by the airtime unfairness, we thus propose a dynamic A-MPDU adaptation method. We showed that our proposed method can maximize throughput while achieving airtime fairness, irrespective of different patterns of channel competition.

DOI： 10.1109/PACRIM47961.2019.8985063

Scopus

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Conceptual experiment of geolocation-aware IoT data dissemination model 査読有り

Yuge K., Taenaka Y., Nobayashi D., Ikenaga T.

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019年08月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. IoT devices are increasingly distributed around the world and have been digitizing physical things so far. However, a current IoT service is designed to be independent; it is not intended to conduct data collaboration with other IoT services. It must be important to be able to commonly use IoT data even from IoT devices managed for different services. To promote IoT data collaboration, we proposed a cross-domain data fusion platform on the basis of geographical proximity, called geocentric information platform (GCIP). Although GCIP enabled to collect and process data generated associated with geolocation of data generation, how to disseminate them should be still discussed. We can easily assume that some data summarization is preferable when data are used far away from the location of data generation. We also assume that there must be privacy and security issues in IoT data. That is why we propose a geolocation-aware IoT data dissemination model, which summarizes data due to the different distance between the location of the data source and the location of the destination. That is, as the distance becomes longer, the data is coarser. In this paper, we particularly focus on the behavior of the model and show the conceptual behavior by conducting experiments in a real environment.

DOI： 10.1109/PACRIM47961.2019.8985124

Scopus

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Adaptive Server and Path Switching Scheme for Content Delivery Network 査読有り

Nishimuta H., Nobayashi D., Ikenaga T.

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019年08月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. Due to increases in the number of providers providing large-capacity content, multimedia products such as videos, images, and music now account for most of the traffic flowing over the Internet, and content delivery networks (CDNs) that can guarantee the load distribution and communication quality of related products on the Internet are in use around the world. However, with current CDN technologies, it is difficult to change the server or the path between a user and a server after a user has established a connection with a distribution server. Therefore, when dealing with long duration CDN communications, the conventional path control and distribution server selection methods related to CDNs cannot respond flexibly to changes in communication quality once communication has started. In response to this issue, this paper proposes a path and server switching scheme based on the estimated available throughput of each path as a way to improve CDN communication performance. Furthermore, via network simulations, we show that our proposed method can provide higher throughput performance than existing methods.

DOI： 10.1109/PACRIM47961.2019.8985085

Scopus

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Managing Path Switching in Multipath Video Streaming 査読有り国際誌

Shinichi Nagayama, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Eleventh International Conference on Evolving Internet (INTERNET 2019), Jun. 2019. 2019年07月

A dynamic channel switching for rod-san 査読有り

Nobayashi D., Fukuda Y., Tsukamoto K., Ikenaga T.

IEICE Transactions on Information and Systems ( 電子情報通信学会 ) E102D ( 5 ) 920 - 931 2019年05月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2019 The Institute of Electronics, Information and Communication Engineers. Wireless sensor and actuator networks (WSANs) are expected to become key technologies supporting machine-to-machine (M2M) communication in the Internet of things (IoT) era. However, sensors must be able to provide high demand response (DR) levels despite severely limited battery power. Therefore, as part of efforts to achieve a high DR, we are working on research and development related to radio-on-demand sensor and actuator networks (ROD-SANs). ROD-SAN nodes are equipped with wake-up receivers that allow all nodes to stay in sleep mode for a long period of time, and transmit only after the receiver receives a wake-up signal. In addition, sender nodes can direct the receiver nodes to switch communication channels because the wake-up signal also includes information on the channel to use for communication between each other. However, as the number of nodes utilizing the same channel increases, frequent packet collisions occur, thereby degrading response performance. To reduce packet collisions, we propose an own-channel-utilization based channel switching (OCS) scheme, which is a modification of the average-channel-utilization based switching (ACS) as our previous works. The OCS scheme decides whether or not to switch channels based on a probability value that considers not only average-channel utilization of nearby nodes but also own-channel utilization. This approach permits node switching to other channels by considering the overall utilization states of all channels. In this paper, based on simulations, we show that our scheme can improve the delivery ratio by approximately 15% rather than ACS scheme.

DOI： 10.1587/transinf.2018NTP0007

Scopus

CiNii Article

CiNii Research

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Clustering malicious DNS queries for blacklist-based detection 査読有り

Satoh A., Nakamura Y., Nobayashi D., Sasai K., Kitagata G., Ikenaga T.

IEICE Transactions on Information and Systems E102D ( 7 ) 1404 - 1407 2019年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2019 The Institute of Electronics, Information and Communication Engineers. Some of the most serious threats to network security involve malware. One common way to detect malware-infected machines in a network is by monitoring communications based on blacklists. However, such detection is problematic because (1) no blacklist is completely reliable, and (2) blacklists do not provide the sufficient evidence to allow administrators to determine the validity and accuracy of the detection results. In this paper, we propose a malicious DNS query clustering approach for blacklist-based detection. Unlike conventional classification, our cause-based classification can efficiently analyze malware communications, allowing infected machines in the network to be addressed swiftly.

DOI： 10.1587/transinf.2018EDL8211

Scopus

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Experimental performance evaluation of the collisions in lora communications 査読有り

Ishida Y., Nobayashi D., Ikenaga T.

Proceedings - 2018 International Conference on Computational Science and Computational Intelligence, CSCI 2018 1032 - 1035 2018年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. With the development and spread of Internet of Things (IoT) technologies, various organizations in industry, academia, and government have begun collecting numerous types of data using sensor devices, which they then use to predict trends and identify potential problems with the services they provide. In the IoT, low power wide area (LPWA) networks can achieve low power consumption and provide a wide range of communication options that ensure constant service provision to deployed sensors. In particular, LoRa digital wireless communication technology, which has an open specification, uses an unlicensed band, and is inexpensive to install, is becoming increasingly popular and the number of sensors equipped with it is expected to grow in the future. However, since LoRa has insufficient specifications and verifications to resist channel contention within a heavily used frequency band, the performance of that technology is unclear when the number of sensors using the same frequency band increases. In this paper, we clarify the experimental performance of LoRa when multiple wireless communication nodes compete in different patterns.

DOI： 10.1109/CSCI46756.2018.00200

Scopus

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Path-selection method based on the available bandwidth of interfaces 査読有り

Ishida D., Nobayashi D., Ikenaga T.

Proceedings - 2018 International Conference on Computational Science and Computational Intelligence, CSCI 2018 815 - 818 2018年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. The number of end devices equipped with multiple interfaces is increasing, owing to the spread of the Internet and the development of wireless communication technologies. Many applications work and communicate simultaneously in one end device. However, such end devices are difficult to utilize multiple interfaces and multiple paths effectively. Traditional transport protocols, such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), support only single-path communication, so end device applications tend to use only single interface and path. Application' flows become unbalanced and compete; hence, their performance degrades. There are many related works using multiple interfaces and paths simultaneously, such as Multipath Transmission Control Protocol (MPTCP) and Multipath Internet Protocol (MPIP). However, in some cases, these methods cannot improve the communication performance because scheduling to multipath for concurrent applications is not effective. In this paper, we propose the path-selection method for each application based on the available bandwidth of interfaces of a device. This method can utilize network resources and improve the performance of all applications when many applications work and communicate on a device equipped with multiple interfaces. We evaluate this method using network simulations and show its usability.

DOI： 10.1109/CSCI46756.2018.00163

Scopus

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Autonomous Data Transmission Control Based on Node Density for Multiple Spatio-Temporal Data Retention 査読有り

Nobayashi D., Tsukamoto K., Ikenaga T.

Proceedings of the 2018 IEEE 7th International Conference on Cloud Networking, CloudNet 2018 2018年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. Although countless services can now be accessed via the Internet, some specific services such as local traffic conditions and limited-time sale advertisements are strongly dependent on geographical locations and times. Information of this type, which is commonly referred to as spatio-temporal data (STD), is not readily available online. Since the paradigm of local production and consumption of STDs can be effective for location-dependent applications, we previously proposed an STD data retention system that uses vehicular networks to create a mobile cloud. Unfortunately, effective data retention is difficult when multiple STDs exist in the same area because channel interference will result from the increased number of data transmissions. To resolve this issue, we herein propose an autonomous data transmission control method based on node density for multiple STD retention that facilitates a highly reliable coverage rate while limiting the individual data transmissions for each STD. Then, through simulations, we show that our proposed method is effective for simultaneously retaining multiple STDs.

DOI： 10.1109/CloudNet.2018.8549521

Scopus

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Experimental Investigation of Static Channel Bonding Performance in Competitive Environment

Kazuki Fujii, Hitomi Tamura, Daiki Nobayashi, Kazuya Tsukamoto

Technical Report of IEICE 2018年10月

Estimating the Randomness of Domain Names for DGA Bot Callbacks 査読有り

Akihiro Satoh, Yutaka Nakamura, Daiki Nobayashi, Takeshi Ikeanga

IEEE Communication Letters 22 ( 7 ) 2018年07月

Spatio-Temporal Data Retention System with MEC for Local Production and Consumption 査読有り

Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga, Mario Gerla

Proceedings - International Computer Software and Applications Conference 1 795 - 796 2018年06月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. To facilitate local production and consumption (LPAC) of spatio-temporal data (STD) generated by Internet of Things (IoT) devices, we propose a STD retention system that works in collaboration with Mobile Edge Computing (MEC) infrastructure. In this paper, we will introduce the architecture of our proposed system and discuss its contributions and challenges.

DOI： 10.1109/COMPSAC.2018.00124

Scopus

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TCP State Driven MPTCP Packet Scheduling for Streaming Video 査読有り

Ryota Matsufuji, Shinichi Nagayama, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Nineth International Conference on Evolving Internet (INTERNET 2018) 2018年06月

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論文 - 野林　大起