Faculty Profiles - NOBAYASHI Daiki

Papers - NOBAYASHI Daiki

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Adaptive Data Transmission Control for Spatio-temporal Data Retention over Crowds of Vehicles Reviewed International journal

Nobayashi D., Goto I., Teshiba H., Tsukamoto K., Ikenaga T., Gerla M.

IEEE Transactions on Mobile Computing 21 ( 11 ) 3822 - 3835 2022.11

P4-Based Buffer Management Method for Throughput Fairness Improvement with Different Congestion Control Contention Reviewed

Koshi Ono, Daiki Nobayashi, Takeshi Ikeanga

2025.01

Multi-Dementional Feature Engineering for Reliable Detection Method of Vehicles with Location Information Errors in Spatio-Temporal Data Retention System Reviewed

Tatsuya Takabe, Hiroshi Yamamoto, Daiki Nobayashi, Takeshi Ikenaga, Kazuya Tsukamoto

2025.01

Experimental evaluation of downlink communication performance of IEEE 802.11ax wireless LAN: OFDM vs. OFDMA Reviewed International journal

Oogami T., Tamura H., Nobayashi D., Tsukamoto K.

International Journal of Grid and Utility Computing 16 ( 1 ) 60 - 68 2025.01

Packet Scheduling Algorithm for Improving Fairness under Different Congestion Control Contention using P4 Reviewed

Koshi Ono, Daiki Nobayashi, Takeshi Ikeanga

2024.11

Performance Improvement of Large Spatio-Temporal Data With Encoded Packets Reviewed

Naoki Tanaka, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga

2024.11

Data Collection Method for MEC integrated with STD Retention System on Floating-CPS Platform Reviewed

Meiya Tanaka, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga, Shu Sekigawa, Myung Lee

2024.11

Malicious Behavior Detection Method based on Feature Extraction of Malware DNS Traffic Data Reviewed

Toshiki Koga, Daiki Nobayashi, Takeshi Ikenaga

2024.11

Efficient Frequency Bandwidth Limitation for Wireless-Based Ultrasonic Data Collection Systems Reviewed International journal

Shigyo Rio, Nobayashi Daiki, Tsukamoto Kazuya, Mizumachi Mitsunori, Ikenaga Takeshi

Journal of Signal Processing ( Research Institute of Signal Processing, Japan ) 28 ( 4 ) 129 - 132 2024.07

Authorship：Corresponding author 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

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Other Link： https://www.jstage.jst.go.jp/article/jsp/28/4/28_129/_pdf

Fairness improvement method using explicit congestion notification for QUIC Reviewed International journal

Uchida Nobuhiro, Nobayashi Daiki, Cavendish Dirceu, Ikenaga Takeshi

IEICE Communications Express ( The Institute of Electronics, Information and Communication Engineers ) 13 ( 6 ) 222 - 226 2024.06

Authorship：Corresponding author 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

Kyutacar

CiNii Research

Other Link： http://xplorestaging.ieee.org/ielx7/10250155/10547173/10494945.pdf?arnumber=10494945

Performance Evaluation of Multipath TCP Video Streaming on LEO Satellite/Cellular Networks Reviewed

2024.03

An Efficient Method of Frequency Bandwidth Limitation for Wireless-based Ultrasonic Data Collection System Reviewed

Rio Shigyo, Daiki Nobayashi, Kazuya Tsukamoto, Mitsunori Mizumachi, Takeshi Ikenaga

2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing 2024.03

Performance Evaluation of Multipath TCP Video Streaming on LEO Satellite/Cellular Networks Reviewed

Yosuke Komatsu, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

2024.03

An Efficient Method of Frequency Bandwidth Limitation for Wireless-based Ultrasonic Data Collection System Reviewed

2024.02

Dynamic Transmission Parameter Settings Based on Data Transmission and Reception Performance for 920MHz LoRa Communication Reviewed

Tanaka R., Nobayashi D., Tsukamoto K., Ikenaga T., Sato G., Takizawa K.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1102 - 1103 2024.01

Dynamic A-MPDU Adaptation Method for Airtime Fairness in Channel Bonding-Ready WLANs Reviewed International journal

Tamura H., Nobayashi D., Kawahara K., Tsukamoto K.

IEEE Access 12 87954 - 87966 2024.01

Accuracy Improvement Method for Malicious Domain Detection Using Machine Learning Reviewed

Koga T., Nobayashi D., Ikenaga T.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1108 - 1109 2024.01

Packet Recovery Method with Redundant Packets for Large Spatio-Temporal Data Retention Reviewed

Tanaka N., Nobayashi D., Tsukamoto K., Ikenaga T.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1110 - 1111 2024.01

Performance Evaluation of Spatio-temporal Data Retention System Supporting a Floating Cyber-physical System Invited Reviewed International journal

Nobayashi Daiki, Akashi Renju, Tsukamoto Kazuya, Ikenaga Takeshi, Lee Myung J.

Journal of Information Processing ( Information Processing Society of Japan ) 32 ( 0 ) 566 - 574 2024.01

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

We propose a floating cyber-physical system (F-CPS) as a novel platform for data distribution and application execution to realize a CPS. The F-CPS constructs a local-oriented and distributed CPS using devices with computing capability close to the user, such as smartphones, sensor devices, vehicles, and roadside units. This paper first provides an overview of the F-CPS and then discusses the challenges posed by the spatio-temporal retention system (STD-RS), a network technology for data distribution and maintenance in the local area of the F-CPS. To address the challenges associated the STD-RS, we propose adaptive data transmission control to effectively retain the STD in a certain area. Finally, we performed network simulations to demonstrate the effectiveness of the proposed adaptive method.

DOI： 10.2197/ipsjjip.32.566

Kyutacar

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Experimental Evaluation for TCP/IP Communication Performance in Multi-Hop Private LoRa Network Reviewed

Aramaki E., Nobayashi D., Tsukamoto K., Ikenaga T., Sato G., Takizawa K.

IEEE Workshop on Local and Metropolitan Area Networks 7 - 8 2024.01

Performance Evaluation of the Impact between IEEE 802.11ah and Private LoRa Using 920 MHz Band Reviewed

Takeuchi Y., Nobayashi D., Ikenaga T.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1104 - 1105 2024.01

Poster: TCP Congestion Control based on Transmission Rate of Wireless LAN Interfaces Reviewed International journal

Okada A., Nobayashi D., Ikenaga T.

Proceedings - International Conference on Network Protocols, ICNP 2024.01

Performance Evaluation of Dynamic Transmission Parameter Control Method for Mobile Terminal with 920 MHz LoRa Communication Reviewed International journal

Tanaka R., Nobayashi D., Tsukamoto K., Ikenaga T., Sato G., Takizawa K.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024.01

Multipath TCP Video Streaming Hand-Offs on LEO Satellite/5G Cellular Networks Reviewed International journal

Komatsu Y., Cavendish D., Nobayashi D., Ikenaga T.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024.01

MEC Collaborative Function Retention System Using WebAssembly for Floating-CPS Reviewed International journal

Tanaka M., Nobayashi D., Tsukamoto K., Ikenaga T., Sekigawa S., Lee M.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024.01

In-Orbit Performance of LoRa for Internet of Things Communication on MicroOrbiter-1 Satellite Reviewed

Khamsah N.M.N., Moumni F., Nobayashi D., Ikenaga T., Cho M.

COMNETSAT 2024 - IEEE International Conference on Communication, Networks and Satellite 48 - 54 2024.01

Fairness Improvement of Different TCP Congestion Control Algorithms Using P4 Programmable Data Plane Reviewed International journal

Ono K., Nobayashi D., Ikenaga T.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024.01

Frequency Bandwidth Limitation Method by Autocorrelation for Ultrasonic Data Collection System Reviewed

2023.11

Complementary Data Diffusion Method for Quick Retention of Large SpatioTemporal Data Reviewed

2023.11

Experimental Evaluation of Transmission Control Method Based on Received Signal Strength for Spatio-Temporal Data Retention Reviewed

2023.06

Improvement of TCP Performance based on Characteristics of Private LoRa Interface Reviewed

2023.06

BBR Performance over Variable Delay Paths on Multipath TCP Video Streaming Reviewed

Masayoshi Kondo, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Fifteenth International Conference on Evolving Internet (INTERNET 2023) 2023.03

Performance Evaluation on the Impact of Bottleneck Link Buffer Size under Different Congestion Control Algorithm Competition in QUIC Reviewed

Uchida N., Nobayashi D., Ikenaga T., Cavendish D.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 2023-January 714 - 715 2023.01

Location-Based Autonomous Transmission Control Method for Spatio-Temporal Data Retention System Reviewed

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

Lecture Notes in Networks and Systems 570 LNNS 224 - 235 2023.01

Effective Data-Sharing Method for Multiple ICR Management in Autonomous Distributed Control Systems Reviewed

Kawano T., Nobayashi D., Ikenaga T.

Lecture Notes in Networks and Systems 492 239 - 248 2023.01

Complementary Data Transmission Control with Collision Avoidance for Efficient Retention of Large-size Spatio-Temporal Data Reviewed

Kaneyasu H., Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 2023-January 710 - 711 2023.01

A Reliability Audit Mechanism based on Multi-layered Blockchain for Spatio-Temporal Data Retention System Reviewed

Ueda J., Tsukamoto K., Yamamoto H., Nobayashi D., Ikenaga T., Lee M.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 2023-January 939 - 940 2023.01

Improvement of TCP Performance based on Characteristics of Private LoRa Interface Reviewed

Sakamoto J., Nobayashi D., Tsukamoto K., Ikenaga T., Sato G., Takizawa K.

Proceedings - International Computer Software and Applications Conference 2023-June 998 - 999 2023.01

Experimental Evaluation of Transmission Control Method based on Received Signal Strength for Spatio-Temporal Data Retention Reviewed

Akashi R., Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Proceedings - International Computer Software and Applications Conference 2023-June 1006 - 1007 2023.01

Poster: Fairness Improvement Method Using ECNs with Different Congestion Control Algorithms within QUIC Reviewed International journal

Uchida N., Nobayashi D., Cavendish D., Ikenaga T.

Proceedings - International Conference on Network Protocols, ICNP 2023.01

P4-based In-Network RL inference for Efficient Flow-Level Bandwidth Allocation Reviewed International journal

Qadeer A., Lee M.J., Nobayashi D.

Proceedings - IEEE Global Communications Conference, GLOBECOM 1247 - 1252 2023.01

Integrated Artificial Intelligence Technology for Mobility Load Balancing and Coverage Optimization Reviewed

Yi-We Ma, Chun-Yao Chang, Yi-Hao Tu, Jiann-Liang Chen, Kazuya Tsukamoto, Masahiro Shibata, Daiki Nobayashi, Takeshi Ikenaga

The 10th International Symposium on Applied Engineering and Sciences (2022) 2022.12

Spatio-temporal Data Retention System for Floating Cyber Physical System Reviewed

Hotaka Kaneyasu, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga, Myung Lee

The 10th International Symposium on Applied Engineering and Sciences (2022) 2022.12

Implementation and Performance Evaluation of TCP/IP Communication over Private LoRa Reviewed

Sakamoto J., Nobayashi D., Tsukamoto K., Ikenaga T., Sato G., Takizawa K.

Proceedings - International Conference on Network Protocols, ICNP 2022-October 2022.10

Evaluation of MPTCP with BBR Performance on Wi-Fi/Cellular networks for Video Streaming Reviewed

Masayoshi Kondo, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Fourteenth International Conference on Evolving Internet (INTERNET 2022) 2022.05

Data Completeness-aware Transmission Control for Large Spatio-Temporal Data Retention Reviewed International journal

Kaneyasu H., Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 2022-January 2022.01

Unknown Malicious Domain Detection based on DNS Query Analysis using Word2Vec Reviewed International journal

Yamada H., Nobayashi D., Satoh A., Nakamura Y., Ikenaga T.

Proceedings - 2022 International Conference on Computational Science and Computational Intelligence, CSCI 2022 1096 - 1097 2022.01

Study of Ultrasonic Data Collection System for Anomaly Detection for Mechanical Equipment Reviewed International journal

Shigyo R., Nobayashi D., Tsukamoto K., Mizumachi M., Ikenaga T.

Proceedings - 2022 International Conference on Computational Science and Computational Intelligence, CSCI 2022 1237 - 1238 2022.01

Collision Avoidance Method for Broadcast Communication Over Multi-Hop HD-PLC Network Reviewed International journal

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

Proceedings - 2022 International Conference on Computational Science and Computational Intelligence, CSCI 2022 1185 - 1186 2022.01

Development of Wireless Communication System for Reliable Acoustic Data Collection Toward Anomaly Detection on Mechanical Equipment Reviewed

Chinari Takano, Shinya Fujino, Daiki Nobayashi, Kazuya Tsukamoto, Mitsunori Mizumachi, Takeshi Ikenaga

The 2021 International Conference on Computational Science & Computational Intelligence (CSCI 2021) 2021.12

Path Schedulers Performance on Cellular/Wi-Fi Multipath Video Streaming Reviewed International journal

Masayoshi Kondo, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Thirteenth International Conference on Evolving Internet (INTERNET 2020) 2021.07

An Approach for Identifying Malicious Domain Names Generated by Dictionary-Based DGA Bots Reviewed International journal

Akihiro Satoh, Yutaka Nakamura, Yutaka Fukuda, Daiki Nobayashi, Takeshi Ikenaga

IEICE Transactions on Information Systems E104-D ( 5 ) 2021.05

IEEE802.11ac準拠の機器におけるチャネルボンディング機能の性能評価 Reviewed

田村瞳, 藤井一樹, 野林大起, 塚本和也

情報処理学会デジタルプラクティス 2 ( 2 ) 99 - 113 2021.04

Transmission Control Method for Data Retention Taking into Account the Low Vehicle Density Environments Reviewed

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

IEICE Transactions on Information and Systems E104.D ( 4 ) 508 - 512 2021.04

Geolocation-centric information platform for resilient spatio-temporal content management Reviewed

Tsukamoto K., Tamura H., Taenaka Y., Nobayashi D., Yamamoto H., Ikenaga T., Lee M.

IEICE Transactions on Communications E104B ( 3 ) 199 - 209 2021.03

Beacon-less autonomous transmission control method for spatio-temporal data retention Reviewed

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

Advances in Intelligent Systems and Computing 1263 AISC 503 - 513 2021.01

Efficient data diffusion and elimination control method for spatio-temporal data retention system Reviewed

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

IEICE Transactions on Communications E104B ( 7 ) 805 - 816 2021.01

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

With the development and spread of Internet of Things technologies, various types of data for IoT applications can be generated anywhere and at any time. Among such data, there are data that depend heavily on generation time and location. We define these data as spatio-temporal data (STD). In previous studies, we proposed a STD retention system using vehicular networks to achieve the “Local production and consumption of STD” paradigm. The system can quickly provide STD for users within a specific location by retaining the STD within the area. However, this system does not take into account that each type of STD has different requirements for STD retention. In particular, the lifetime of STD and the diffusion time to the entire area directly influence the performance of STD retention. Therefore, we propose an efficient diffusion and elimination control method for retention based on the requirements of STD. The results of simulation evaluation demonstrated that the proposed method can satisfy the requirements of STD, while maintaining a high coverage rate in the area.

DOI： 10.1587/transcom.2020CQP0010

Scopus

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An Approach for Identifying Malicious Domain Names Generated by Dictionary-Based DGA Bots Reviewed International journal

SATOH Akihiro, NAKAMURA Yutaka, FUKUDA Yutaka, NOBAYASHI Daiki, IKENAGA Takeshi

IEICE Transactions on Information and Systems ( The Institute of Electronics, Information and Communication Engineers ) E104.D ( 5 ) 669 - 672 2021.01

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

Computer networks are facing serious threats from the emergence of sophisticated new DGA bots. These DGA bots have their own dictionary, from which they concatenate words to dynamically generate domain names that are difficult to distinguish from human-generated domain names. In this letter, we propose an approach for identifying the callback communications of DGA bots based on relations among the words that constitute the character string of each domain name. Our evaluation indicates high performance, with a recall of 0.9977 and a precision of 0.9869.

DOI： 10.1587/transinf.2020NTL0001

Scopus

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Development of a Wireless Communication System for Reliable Acoustic Data Collection Toward Anomaly Detection in Mechanical Equipment Reviewed

Takano C., Fujino S., Nobayashi D., Tsukamoto K., Mizumachi M., Ikenaga T.

Proceedings - 2021 International Conference on Computational Science and Computational Intelligence, CSCI 2021 1544 - 1547 2021.01

Development of Data Collection Platform for Running Cars by using 920MHz LoRa Communication in Urban Area Reviewed International journal

Yasufumi Niwa, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenag

2020 International Conference on Emerging Technologies for Communications (ICETC2020) 2020.12

Development of Vehicle Management System using Location Data Collected by 920MHz LoRa Reviewed

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

Proceedings - 2020 International Conference on Computational Science and Computational Intelligence, CSCI 2020 208 - 209 2020.12

Adaptive Server and Path Switching for Content Delivery Networks Reviewed

Nishimuta H., Nobayashi D., Ikenaga T.

IEICE Transactions on Information and Systems ( The Institute of Electronics, Information and Communication Engineers ) E103D ( 11 ) 2389 - 2393 2020.11

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

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Handoff Characterization of Multipath Video Streaming Reviewed International journal

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

The Twelfth International Conference on Evolving Internet (INTERNET 2020) 2020.10

Station-centric Access Point Selection Method for Heterogeneous Wi-Fi Environment Reviewed International journal

2020.01

On-demand transmission interval control method for spatio-temporal data retention Reviewed

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

Advances in Intelligent Systems and Computing 1035 319 - 330 2020.01

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

© 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

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Transmission control method to realize efficient data retention in low vehicle density environments Reviewed International journal

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

Advances in Intelligent Systems and Computing 1035 2020.01

Path Switching Schedulers for MPTCP Streaming Video Reviewed

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

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019.08

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

© 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

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Dynamic A-MPDU adaptation method for airtime fairness in channel bonding-ready WLANs Reviewed

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

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019.08

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

© 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

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Conceptual experiment of geolocation-aware IoT data dissemination model Reviewed

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

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019.08

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

© 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

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Adaptive Server and Path Switching Scheme for Content Delivery Network Reviewed

Nishimuta H., Nobayashi D., Ikenaga T.

2019 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2019 - Proceedings 2019.08

Managing Path Switching in Multipath Video Streaming Reviewed International journal

Shinichi Nagayama, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Eleventh International Conference on Evolving Internet (INTERNET 2019), Jun. 2019. 2019.07

A dynamic channel switching for rod-san Reviewed

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

IEICE Transactions on Information and Systems ( The Institute of Electronics, Information and Communication Engineers ) E102D ( 5 ) 920 - 931 2019.05

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

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

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Clustering malicious DNS queries for blacklist-based detection Reviewed

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

IEICE Transactions on Information and Systems E102D ( 7 ) 1404 - 1407 2019.01

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

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

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Experimental performance evaluation of the collisions in lora communications Reviewed

Ishida Y., Nobayashi D., Ikenaga T.

Proceedings - 2018 International Conference on Computational Science and Computational Intelligence, CSCI 2018 1032 - 1035 2018.12

Path-selection method based on the available bandwidth of interfaces Reviewed

Ishida D., Nobayashi D., Ikenaga T.

Proceedings - 2018 International Conference on Computational Science and Computational Intelligence, CSCI 2018 815 - 818 2018.12

Autonomous Data Transmission Control Based on Node Density for Multiple Spatio-Temporal Data Retention Reviewed

Nobayashi D., Tsukamoto K., Ikenaga T.

Proceedings of the 2018 IEEE 7th International Conference on Cloud Networking, CloudNet 2018 2018.11

Experimental Investigation of Static Channel Bonding Performance in Competitive Environment

Kazuki Fujii, Hitomi Tamura, Daiki Nobayashi, Kazuya Tsukamoto

Technical Report of IEICE 2018.10

Estimating the Randomness of Domain Names for DGA Bot Callbacks Reviewed

Akihiro Satoh, Yutaka Nakamura, Daiki Nobayashi, Takeshi Ikeanga

IEEE Communication Letters 22 ( 7 ) 2018.07

Spatio-Temporal Data Retention System with MEC for Local Production and Consumption Reviewed

Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga, Mario Gerla

Proceedings - International Computer Software and Applications Conference 1 795 - 796 2018.06

TCP State Driven MPTCP Packet Scheduling for Streaming Video Reviewed

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

The Nineth International Conference on Evolving Internet (INTERNET 2018) 2018.06

Estimating the Randomness of Domain Names for DGA Bot Callbacks Reviewed

Akihiro Satoh, Yutaka Nakamura, Daiki Nobayashi, Takeshi Ikeanga,

IEEE Communications Letters 2018.04

Multipath TCP path schedulers for streaming video Reviewed

2017-January 1 - 6 2017.11

Performance Evaluation of 920 MHz band communication for underground infrastructure monitoring

Yuri Fujisaki, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga

Technical Report of IEICE 2017.10

VANET based Effective Data Transmission Control for Spatio-Temporal Data Retention System

Hiroki Teshiba, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga

Technical Report of IEICE 2017.10

Multipath TCP Packet Scheduling for Streaming Video Reviewed

Ryota Matsufuji, Dirceu Cavendish, Kazumi Kumazoe, Daiki Nobayashi, Takeshi Ikenaga

The Nineth International Conference on Evolving Internet (INTERNET 2017) 2017.07

Field tests and indoor emulation of Real-Spatial Information Based Group Communication Reviewed

Nagata A., Nakamura K., Fuji H., Nobayashi D., Tsukamoto K., Ikenaga T.

2017 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2017 66 - 67 2017.05

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

© 2017 IEEE. We proposed a novel scheme that combines information exchange and user social activities in real-time so that users can integrate their communications seamlessly with their daily lives. Called the Real-Spatial Information-Based Group Communication (r-Space) system, this scheme creates r-Space groups by considering personal and location information and enables users to share information within those groups. We developed a prototype system consisted of client application and control server and then conducted a field experiment in Nov. 2016. In PerCom 2017, the introduction of the experiment and its live demonstration will be exhibited.

DOI： 10.1109/PERCOMW.2017.7917524

Scopus

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Adaptive Data Transmission Control for Reliable and Efficient Spatio-Temporal Reviewed

Hiroki Teshiba, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga

The Sixteenth International Conference on Networks (ICN2017) 2017.04

Reliable Data Delivery Scheme for Real-Spatial Information Based Group Communication Reviewed

Daiki Nobayashi, Masaya Mitsuishi, Takeshi Ikenaga, Akira Nagata, Katsuichi Nakamura

IEICE Communications Express 6 ( 6 ) 393 - 398 2017.03

Performance Characterization of Streaming Video over Multipath TCP Reviewed

Ryota Matsufuji, Dirceu Cavendish, Kazumi Kumazoe, Daiki Nobayashi, Takeshi Ikenaga, Yuji Oie

The Eighth International Conference on Evolving Internet (INTERNET 2016) 2016.11

Power Saving Scheme by Broadcast Proxy for ROD Wireless LAN Reviewed

Daiki Nobayashi, Yutaka Fukuda, Takeshi Ikenaga

IEICE Transactions on Communications J99-B ( 10 ) 908 - 910 2016.10

Regional infohubs by vehicles: Balancing spatio-temporal coverage and network load Reviewed

Higuchi T., Onishi R., Altintas O., Nobayashi D., Ikenaga T., Tsukamoto K.

IoV-VoI 2016 - Proceedings of the 1st MobiHoc International Workshop on Internet of Vehicles and Vehicles of Internet 25 - 30 2016.07

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

© 2016 ACM. The growing ubiquity of on-board wireless communication devices in vehicles is steadily opening up new possibilities of vehicular networks. In this paper, we design a framework to utilize radio-equipped cars as regional information hubs, which periodically disseminate public regional information (e.g., advertisements, travel tips, emergency info, etc.) over a designated geographical area in a city. The cars driving in the designated area repeatedly broadcast the data messages, allowing other drivers and pedestrians to passively obtain the information with their on-board wireless devices and/or smartphones. Although the idea follows a natural extension of the current capability of vehicular networks, vehicle densities in urban areas are typically highly non-uniform both in time and space, making it difficult to robustly disseminate data messages with minimal network load. We tackle this issue by introducing a probabilistic framework to intelligently adapt message dissemination strategy. Analyzing location broadcast messages, which are periodically exchanged among vehicles for safety applications, our protocol predicts future locations of neighboring radio-equipped vehicles and dynamically adjusts probability of message transmissions at each moment to suppress redundant network traffic. Simulation results show that our protocol can reduce the total amount of redundant message transmissions by up to 78%, while maintaining the spatio-temporal coverage of message dissemination.

DOI： 10.1145/2938681.2938688

Scopus

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Radio-on-Demand Networks for Green Wireless Networks Invited Reviewed

Takeshi Ikenaga, Hiryuki Yomo, Akira Hasegawa, Kenichi Abe, Daiki Nobayashi, Tetsuya Ito

IEICE Transactions on Communications J99-B ( 4 ) 261 - 274 2016.04

Adaptive contention window control scheme for dense IEEE802.11 wireless LANs Reviewed

Ito R., Nobayashi D., Ikenaga T.

IEEE Pacific RIM Conference on Communications, Computers, and Signal Processing - Proceedings 2015-November 326 - 331 2015.11

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

© 2015 IEEE. As portable information devices with a wireless local area network (LAN) interfaces, such as smartphones and tablet computers, become increasingly widespread, high station density and accompanying severe area throughput degradation are becoming more commonplace. One factor related to this situation is that the initial minimum contention windows size (CWmin) value in current Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) systems is set too low for the number of accessing stations. Because small CWmin values are unsuitable for high station densities, frame collisions become more commonplace and per-station communication performance decreases. In this paper, we assume that numerous stations are connected to a single access point (AP) and propose a media access control method for high station density network. In our proposed method, the AP periodically measures channel utilization and the number of stations that are transmitting frames to the AP, and then modifies the CWmin value based on these parameters. The AP then uses a beacon signal to inform the stations accessing the network of the new CWmin value. To verify the performance of our scheme, QualNet network simulations were performed, the results of which show us that, in terms of throughput, our proposed method outperforms conventional CSMA/CA schemes in wireless LAN environments with high station densities.

DOI： 10.1109/PACRIM.2015.7334856

Scopus

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Performance evaluation of multi-hop communication with a dynamic channel switching scheme in ROD-SAN Reviewed

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

IEEE Pacific RIM Conference on Communications, Computers, and Signal Processing - Proceedings 2015-November 332 - 337 2015.11

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

© 2015 IEEE. Wireless sensor and actuator networks (WSANs) are expected to be come fundamental technologies supporting machine-to-machine (M2M) communication and the internet of things (IoT). However, wireless sensors face inherent limitations because they must provide high demand response (DR) despite severely limited battery power. In an effort to achieve both power-saving characteristics in addition to high DR, we are working on research and development of radio-on-demand sensor and actuator networks (ROD-SANs), in which each node is equipped with a wake-up receiver that allows all nodes to stay in sleep mode most of the time, and transmit only after a wake-up signal is received. Since the wake-up signal can also include channel information, the sender nodes can direct the receiver nodes to switch communication channels when needed. However, as the number of nodes using the same channel increases, packet collisions occur more frequently, thereby degrading response performance. On the other hand, frequent channel switching inevitably increases channel switching delays. To simultaneously reduce both packet collisions and channel switching delays, we have extended the average-channel-utilization-based channel switching (ACS) scheme, discussed in our previous work on single-hop communication in a way that allows it to provide efficient performance in multi-hop communication. In this paper, based on simulations, we show how our scheme can improve the delivery ratio performance by approximately 20%.

DOI： 10.1109/PACRIM.2015.7334857

Scopus

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On Demand Routing Scheme for Real-Spatial Information based Group Communication Reviewed

Masaya Mitsuishi, Daiki Nobayashi, Takeshi Ikenaga, Yuji Oie, Hiroshi Ishinishi, Akira Nagata, Katsuichi Nakamura

Proc. on IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM) 2015 2015.08

Transmission Channel Switching Based on Channel Utilization in ROD-SAN Reviewed

Takeo Hidaka, Daiki Nobayashi, Yutaka Fukuda, Kazuya Tsukamoto, Takeshi Ikenaga

Future Network System and Security, Springer International Publishing 129 - 138 2015.06

A Self-adaptive Reliable Packet Transmission Scheme for Wireless Mesh Networks "jointly worked" Reviewed

Shi Wenze, Takeshi Ikenaga, Daiki Nobayashi, Xinchun Yin, and Hui Xu

Proc. of The 5th International Workshop on Wireless Networks and Multimedia (WNM-2014) 2014.08

Reliable Transmission with Multipath and Redundancy for Wireless Mesh Networks "jointly worked" Reviewed

Shi Wenze, Takeshi Ikenaga, Daiki Nobayashi, Xinchun Yin, and Hui Xu

Proc. of The 5th International Workshop on Wireless Networks and Multimedia (WNM-2014) 2014.08

Expiration Timer Control Method for QoS-aware Packet Chunking "jointly worked" Reviewed

Hiroki Yanaga, Daiki Nobayashi, Takeshi Ikenaga

Proc. of The 38th Annual International Computers, Software & Applications Conference 638 - 639 2014.07

Station Reassociation Scheme for Wireless Green Networking "jointly worked" Reviewed

Kazumi Kumazoe, Daiki Nobayashi, Yutaka Fukuda, Takeshi Ikenaga

Proc. of International Workshop on Wireless Networks and Energy Saving Techniques (WNTEST) 2014.06

Flow-based Routing Schemes for Minimizing Network Energy Consumption using OpenFlow "jointly worked" Reviewed

Syouta Oda, Daiki Nobayashi, Yutaka Fukuda, Takeshi Ikenaga

Proc. of the 4th International COnference on Smart Grids, Green Communications and IT Energy-aware Technologies 2014.04

Station Aggregation Scheme considering Channel Interface for Radio on Demand Networks "jointly worked" Reviewed

Kazumi Kumazoe, Daiki Nobayashi, Yutaka Fukuda, Takeshi Ikenaga

Proc. of IEEE Pacific Rim Conference on Communications, Computers and Signal Processing 2013.08

Performance Characterization of Streaming Video over TCP Variants "jointly worked" Reviewed

Gaku Watanabe, Kazumi Kumazoe, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga, Yuji Oie

Proc. of The Fifth International Conference on Evolving Internet (INTERNET 2013) 2013.07

Multiple Station Aggregation Procedure for Radio-On-Demand WLANs "jointly worked" Reviewed

Kazumi Kumazoe, Daiki Nobayashi, Yutaka Fukuda, Takeshi Ikenaga, Kenichi Abe

Proc. of 2012 Seventh International Conference on Broadband, Wireless Computing, Communication and Applications (BWCCA 2012) 156 - 161 2012.11

Autonomous Dynamic Transmission Scheduling Based on Neighbor Node Behavior for Multihop Wireless Networks "jointly worked" Reviewed

Daiki Nobayashi, Yutaka Fukuda, Takeshi Ikenaga

Proc. of the 37th IEEE Conference on Local Computer Network (LCN) 2012 268 - 271 2012.10

A network reconfiguration scheme against misbehaving nodes Reviewed

Nobayashi D., Sera T., Ikenaga T., Nakamura Y., Hori Y.

Proceedings - Conference on Local Computer Networks, LCN 424 - 431 2010.12

Development of Single Sign-On system with hardware token and key management server Reviewed

Nobayashi D., Nakamura Y., Ikenaga T., Hori Y.

IEICE Transactions on Information and Systems E92-D ( 5 ) 826 - 835 2009.01

Development of single sign-on system with hardware token and key management server Reviewed

Nobayashi D., Nakamura Y., Ikenaga T., Hori Y.

Second International Conference on Systems and Networks Communications, ICSNC 2007 2007.12

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

With the growth of the Internet, various types of services, such as World Wide Web (WWW), File Transfer Protocol (FTP), remote login, etc., are widely expanded. Consequently, it is difficult for users to manage all the authentication information, e.g., user ID/Password pairs, keys, and certificates, since the authentication information has been increased to use those services. Therefore, Single Sign-On (SSO) system, which makes all the services available for a user by only one-time authentication, has been developed. However, existing systems cannot provide all the SSO services for any kinds of services on the Internet even if the service provider deploys the SSO server. Therefore, in this paper, we propose a new SSO system with hardware token and key management server to improve the safety and the convenience. Furthermore, we implement the proposed system, and show its effectiveness through evaluation. In addition, adding any functions for this system provide various conveniences to us. As one example, we add high trust connection function for a Web server, and show its the effectiveness through evaluation by implementing it. © 2007 IEEE.

DOI： 10.1109/ICSNC.2007.31

Scopus

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