研究者詳細 - 野林　大起

論文 - 野林　大起

分割表示108 件中 1 - 20 件目／全件表示 >>

Adaptive Data Transmission Control for Spatio-temporal Data Retention over Crowds of Vehicles 査読有り国際誌

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

IEEE Transactions on Mobile Computing 21 ( 11 ) 3822 - 3835 2022年11月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

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

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85103149527&origin=inward

P4-Based Buffer Management Method for Throughput Fairness Improvement with Different Congestion Control Contention 査読有り

Koshi Ono, Daiki Nobayashi, Takeshi Ikeanga

IEEE 43th International Conference on Consumer Electronics (ICCE 2025) 2025年01月

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

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

IEEE 43th International Conference on Consumer Electronics (ICCE 2025) 2025年01月

Experimental evaluation of downlink communication performance of IEEE 802.11ax wireless LAN: OFDM vs. OFDMA 査読有り国際誌

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

International Journal of Grid and Utility Computing 16 ( 1 ) 60 - 68 2025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）

Although Orthogonal Frequency Division Multiple Access (OFDMA), adopted in IEEE 802.11ax, allows an Access Point (AP) to communicate with multiple stations (STAs) simultaneously, the bandwidth of the Resource Unit allocated to each STA is inversely proportional to the number of STAs. In contrast, Orthogonal Frequency Division Multiplexing (OFDM) allows an AP/STA pair, determined by carrier-sense multiple access with collision avoidance, to dominate the entire bandwidth. However, the latency before packet transmission increases with the number of STAs. The number of STAs that want to communicate with an AP thus significantly impacts throughput under OFDM and OFDMA. Therefore, this study evaluates the communication performance for rich content and voice data when multiple STAs (up to five) are connected to an AP with OFDM or OFDMA by lab experiments. Through experimental results, we clarified which is more suitable, either OFDM or OFDMA, to improve the Quality of Experience (QoE) and throughput with the change in the number of STAs and application types of traffic.

DOI： 10.1504/IJGUC.2025.143883

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85215656450&origin=inward

Malicious Behavior Detection Method based on Feature Extraction of Malware DNS Traffic Data 査読有り

Toshiki Koga, Daiki Nobayashi, Takeshi Ikenaga

Proc. of IEICE 2024 International Conference on Emerging Technologies for Communications, (ICETC2024) 2024年11月

Packet Scheduling Algorithm for Improving Fairness under Different Congestion Control Contention using P4 査読有り

Koshi Ono, Daiki Nobayashi, Takeshi Ikeanga

Proc. of IEICE 2024 International Conference on Emerging Technologies for Communications, (ICETC2024) 2024年11月

Performance Improvement of Large Spatio-Temporal Data With Encoded Packets 査読有り

Naoki Tanaka, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga

Proc. of IEICE 2024 International Conference on Emerging Technologies for Communications, (ICETC2024) 2024年11月

Data Collection Method for MEC integrated with STD Retention System on Floating-CPS Platform 査読有り

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

Proc. of IEICE 2024 International Conference on Emerging Technologies for Communications, (ICETC2024) 2024年11月

Efficient Frequency Bandwidth Limitation for Wireless-Based Ultrasonic Data Collection Systems 査読有り国際誌

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

信号処理 ( 信号処理学会 ) 28 ( 4 ) 129 - 132 2024年07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）

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

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/jsp/28/4/28_129/_pdf

Fairness improvement method using explicit congestion notification for QUIC 査読有り国際誌

Uchida Nobuhiro, Nobayashi Daiki, Cavendish Dirceu, Ikenaga Takeshi

IEICE Communications Express ( 一般社団法人電子情報通信学会 ) 13 ( 6 ) 222 - 226 2024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（学術雑誌）

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

その他リンク： http://xplorestaging.ieee.org/ielx7/10250155/10547173/10494945.pdf?arnumber=10494945

Performance Evaluation of Multipath TCP Video Streaming on LEO Satellite/Cellular Networks 査読有り

Yosuke Komatsu, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Sixteenth International Conference on Evolving Internet (INTERNET 2024) 2024年03月

An Efficient Method of Frequency Bandwidth Limitation for Wireless-based Ultrasonic Data Collection System 査読有り

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

2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing 2024年03月

Performance Evaluation of Multipath TCP Video Streaming on LEO Satellite/Cellular Networks 査読有り

Yosuke Komatsu, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Sixteenth International Conference on Evolving Internet (INTERNET 2024) 2024年03月

An Efficient Method of Frequency Bandwidth Limitation for Wireless-based Ultrasonic Data Collection System 査読有り

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

2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing 2024年02月

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

Takeuchi Y., Nobayashi D., Ikenaga T.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1104 - 1105 2024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）

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

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85189199473&origin=inward

Packet Recovery Method with Redundant Packets for Large Spatio-Temporal Data Retention 査読有り

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

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1110 - 1111 2024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）

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

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85189208289&origin=inward

Dynamic Transmission Parameter Settings Based on Data Transmission and Reception Performance for 920MHz LoRa Communication 査読有り

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

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1102 - 1103 2024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）

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

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85189207920&origin=inward

Dynamic A-MPDU Adaptation Method for Airtime Fairness in Channel Bonding-Ready WLANs 査読有り国際誌

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

IEEE Access 12 87954 - 87966 2024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）

Channel bonding is a technology that increases the transmission rates by bundling and using multiple continuous channels. However, its communication performance decreases over time because of the channel competition caused by nearby wireless LAN devices. Dynamic channel bonding (DCB) is projected to become mainstream based on efficient channel utilization, which can overcome this performance degradation even under severe competitive conditions. However, because the implementation of the DCB in actual hardware products and simulators is still in the preliminary stage, its performance has not been evaluated in detail. The performance of DCB has not been evaluated at the frame level with carrier-sense multiple access/collision avoidance (CSMA/CA) functions under diverse channel competition conditions. In this study, we employed a theoretical approach (2times M/M/1/K) based on the frame level to evaluate the performance of DCB with the CSMA/CA function. Furthermore, we implemented a channel bonding mechanism in the Scenargie simulator and verified its effectiveness by comparing the simulation results with theoretical results. The simulation results show that the DCB inevitably undergoes performance degradation owing to a performance anomaly caused by airtime unfairness. Therefore, we propose a dynamic A-MPDU adaptation method to achieve airtime fairness among the nearby wireless LANs. The proposed method can maximize throughput performance while achieving airtime fairness.

DOI： 10.1109/ACCESS.2024.3418434

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85197026498&origin=inward

Accuracy Improvement Method for Malicious Domain Detection Using Machine Learning 査読有り

Koga T., Nobayashi D., Ikenaga T.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1108 - 1109 2024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）

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

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85189209312&origin=inward

Performance Evaluation of Spatio-temporal Data Retention System Supporting a Floating Cyber-physical System 招待有り査読有り国際誌

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

Journal of Information Processing ( 一般社団法人情報処理学会 ) 32 ( 0 ) 566 - 574 2024年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

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

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85203607088&origin=inward

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