Faculty Profiles - MURASE Tutomu

Papers - MURASE Tutomu

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Application of a Deep Reinforcement Learning Algorithm to Virtual Machine Migration Control in Multi-Stage Information Processing Systems Reviewed

Yukinobu Fukushima, Yuki Koujitani, Kazutoshi Nakane, Yuya Tarutani, Celimuge Wu, Yusheng Ji, Tokumi Yokohira and Tutomu Murase

International Conference on Networks (ICN 2024) page： 13 - 18 2024.5

VM Migration Control considering Terminal Location in Multi-stage Information Processing System

Hayato Umeki, Kazutoshi Nakane, Yukinobu Fukushima, Celimuge Wu, Yusheng Ji, Tutomu Murase

IEICE Technical Report Vol. IN2023-86 page： 124 - 129 2024.3

Throughput Measurement by Real Machines in IEEE 802.11ah with Wi-Fi Ad-Hoc Network for High Speed Forest Networks

2024.3

Mobility Control for optimal Location for high Communication Quality of Intra and Inter Body Area Networks

Jihyeok YANG, Takumi KOBAYASHI, Daisuke ANZAI, Tutomu MURASE

IEICE Technical Report Vol. IN2023-68 page： 19 - 24 2024.3

AP Cooperative Mobility Control for Individual Terminal Traffic Intensity in Infrastructural Ad Hoc Network

Jingcheng HUANG, Tutomu MURASE

IEICE Technical Report Vol. IN2023-70 page： 31 - 36 2024.3

Weighted Harmonic Mean Method based on RTT Difference in TCP Flows for Wi-Fi AP Selection by User Cooperative Mobility

Naoyuki ITO, Yohei HASEGAWA, Hiroyasu OBATA, Tutomu MURASE

IEICE Technical Report Vol. IN2023-85 page： 118 - 123 2024.3

Communication Quality Measurement with Real Machines of AMR Ad Hoc Network on Optimal Route Movement Reviewed

R. Takeuchi and T. Murase

2024 IEEE International Conference on Consumer Electronics (ICCE) 2024.1

Movement control of APs constituting a mesh network considering AP movement constraint Reviewed

Ryoga Hashimoto, Satoshi Makido, Tutomu Murase

2024 IEEE International Conference on Consumer Electronics (ICCE) 2024.1

Cooperative Mobility Control Strategy for Improving Communication Quality in Combination of Intra and Inter Networking in Multiple WBANs Reviewed

Jihyeok YANG, Tutomu MURASE

2024 IEEE International Conference on Consumer Electronics (ICCE) 2024.1

PathRefiner: Accurate Bandwidth Estimation Using Large-Sized Virtual Packets for High-Speed Networks Reviewed

Jingcheng HUANG, Naoyuki ITO, Takashi Oshiba, Kozo Satoda, Tutomu MURASE

2024 IEEE International Conference on Consumer Electronics (ICCE) 2024.1

VM Migration That Assures and Maximizes Accuracy in Multi-Stage Information Processing Systems Reviewed

Kazutoshi Nakane,Yukinobu Fukushima,Celimuge Wu,Yusheng Ji,Tutomu Murase

2024 IEEE International Conference on Consumer Electronics (ICCE) 2024.1

VM Migration that Assures and Maximizes Accuracy in Multi-stage Information Processing Systems Reviewed

Nakane K., Fukushima Y., Wu C., Ji Y., Murase T.

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 2024

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Digest of Technical Papers - IEEE International Conference on Consumer Electronics

In this paper, we propose a Virtual Machine (VM) migration method that maximizes the total accuracy in a multistage information processing system, under the constraint that the given ratio of tasks satisfy the constraint of improving the given level of accuracy (i.e., progress in information processing) within a required response time. Conventional methods only aim to improve the total accuracy and do not consider achieving the given level of accuracy for each task. The proposed method aims to improve the ratio of tasks that can satisfy the given level of accuracy by balancing the load among edge servers as much as possible. In order to confirm the effectiveness of the proposed method, we set the given level of task accuracy and evaluate the total accuracy by varying the number of VMs present in the system. The evaluation results show that the proposed method improves the number of VMs satisfying the given level of accuracy by 120% and the total accuracy by up to approximately 13% compared to the case without VM migration.

DOI： 10.1109/ICCE59016.2024.10444362

Scopus

Communication Quality Measurement with Real Machines of AMR Ad Hoc Network on Optimal Route Movement Reviewed

Takeuchi R., Murase T.

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 2024

In this study, we will verify whether the relay node travel route control method is effective in actual experiments. When an Autonomous Mobile Robot (AMR) requires high-Throughput wireless LAN communication during its travel, a system has been proposed to configure an ad hoc network that uses other AMRs (hereafter referred to as nodes) for data relay. Optimal routing control methods have already been proposed to enable relay nodes that relay data to communicate at high throughput. The proposed control method uses a computational model with a simple function, and its effectiveness has been demonstrated. However, the issue is to verify the effectiveness in a real communication environment. Therefore, we conducted experiments on actual equipment and compared the calculated results with the experimental results on actual equipment. The difference between the calculated results and the actual environment was limited to 18 points at most. Therefore, we have shown that the proposed path control method is effective.

DOI： 10.1109/ICCE59016.2024.10444404

Scopus

Cooperative Mobility Control Strategy for Improving Communication Quality in Combination of Intra and Inter Networking in Multiple WBANs Reviewed

Yang J., Murase T.

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 2024

In this paper, we consider a quality control of body-To-body networks (BBN) communication, which is communication between WBANs, in a situation where multiple WBANs coexist and have mutual interference. In multiple WBANs using the same channel, interference between WBANs and throughput of BBN communication depend on the distance between WBANs. Based on the communication characteristic, we propose a strategy where we move people with WBANs. Unlike conventional methods, the proposed strategy maximizes the throughput of BBN and mitigates interference between WBANs with no additional costs such as modification of protocols or hard/software. Our evaluation result showed that the proposed strategy provides the optimal location which can improve throughput of BBN by 58% than the initial location while satisfying the minimum performance of Intra-WBAN required by the user.

DOI： 10.1109/ICCE59016.2024.10444403

Scopus

Higher Throughput Ad-Hoc Networks Considering Tree Density in a Forest Reviewed

Inaoka K., Murase T.

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 2024

To achieve higher throughput communication in a forest, we construct communication environment using IEEE802.11 ad-hoc networks from points where LTE/5G reach. We propose the construction method of ad-hoc networks to change a path depending on tree density. When tree density is low, attenuation is considered to be low, and the NLOS Shortest Path which ignores the obstacles is effective. When tree density is high, attenuation will be also high, and the LOS Detour Path which relay APs and avoid obstacles should be used. We have demonstrated it in experiments. The NLOS Shortest Path was 22.6 Mbps higher at low tree density (625 trees/ha). In contrast, the LOS Detour Path was 5.8 Mbps higher at high tree density (1903 trees/ha). We confirmed that the effective path differs depending on tree density. In addition, we evaluated how much throughput could be obtained at a large communication range required for actual operation. The result was 5.12 Mbps at 288 m even with reasonably high tree density (1308 trees/ha). This experimental result indicates the possibility of obtaining enough high throughput to use video communication service in a forest.

DOI： 10.1109/ICCE59016.2024.10444257

Scopus

Movement control of APs constituting a mesh network considering AP movement constraints Reviewed

Hashimoto R., Makido S., Murase T.

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 2024

We propose a relay AP movement control method for ad-hoc networks where the APs constitute a mobile infrastructure that responds to hotspot position changes under movement constraints. The proposed method moves the relay AP to an optimal position while considering the constraints of movable position. We consider a virtual spring to the spring model to apply the movement constraints. The proposed method uses a spring model after placing virtual terminals and APs at positions symmetrical to the axis of the movement of the relay AP. We evaluated the proposed method assuming a mesh network with terminals along roads. To clarify the impact of the road widths, we varied the road width and the amount of terminal traffic from the initial placement for our evaluation. This is because the effect of road width cannot be ignored due to the short transmission distance of IEEE802.11. The position of terminal movement in the spring model highly depends on the overflow conditions of the communication link. The evaluation results showed that the throughput degradation from the optimum position is reduced by 24% compared to the extended conventional method, which moves the terminal freely and then moves it within the movement constraint when the road width is 23 m. Compared to the optimal position, the proposed method degraded the throughput by about 8% and achieved near-optimal relay AP movement control.

DOI： 10.1109/ICCE59016.2024.10444486

Scopus

Multi-stage Information Processing Systems with VM Migration for Maximum Accuracy. Invited Reviewed

Tutomu Murase, Yukinobu Fukushima, Celimuge Wu, Yusheng Ji

ICCE page： 1 - 2 2024

PathRefiner: Accurate Bandwidth Estimation Using Large-Sized Virtual Packets for High-Speed Networks Reviewed

Huang J., Ito N., Oshiba T., Satoda K., Murase T.

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 2024

To estimate available bandwidth of high-speed lines with high accuracy, we propose PathRefiner, a bandwidth estimation method with two techniques: (1) packet concatenation technique(2) iterative resolution refinement technique. It is one of the so-called packet train methods that estimate available bandwidth by transmitting multiple probing packets. (1) The packet concatenation technique virtually generates large packets necessary for estimating available bandwidth on high-speed lines by concatenating multiple packets of MTU size or smaller. (2) The iterative resolution refinement technique improves the resolution of estimation and enables highly accurate estimation of available bandwidth while minimizing the network load for estimation by finding the optimal number of large-sized virtual packets to be concatenated. As a result, the average value of the relative error between the ground truth and the estimated available bandwidth is relatively small (14.4%), confirming that PathRefiner can accurately estimate the available bandwidth of 1 Gbps high-speed lines.

DOI： 10.1109/ICCE59016.2024.10444457

Scopus

VM Migration Control that Assures and Maximizes Quality in Multi-stage Information Processing Systems

Kazutoshi Nakane,Yukinobu Fukushima,Celimuge Wu,Yusheng Ji,Tutomu Murase

IEICE Technical Report Vol. IN2023-25 page： 46 - 51 2023.7

森林における植生密度を考慮したアドホックネットワーク構成方法

稲岡孝汰郎, 村瀬勉

電子情報通信学会情報ネットワーク研究会 ( B-7-41 ) 2023.3

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