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Design and evaluation of 10-kA class superconducting DC power cable based on longitudinal magnetic field effect

Journal of Physics: Conference Series 2021年第1期1975卷

作者： Y Kinoshita T Yonenaka Y Ichiki T Akasaka E S Otabe M Kiuchi T Matsushita N Hu B Ni T Ma Department of Computer Science and Electronics Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Faculty of Electric Power Engineering Kunming University of Science and Technology No. 727 South Jingming Rd. Chenggong District Kunming 650500 China Department of Information Electronics Fukuoka Institute of Technology 3-30-1 Wajirohigashi Higashi-ku Fukuoka 811-0295 Japan School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China

In this study, we designed a power cable based on the longitudinal magnetic field (LMF) effect using an iterative approximation method. An evaluation of the cable shows that it is more efficient than conventional-design power cables. A cable with four inner layers and four shield layers and a maximum winding angle of 30° had a current capacity of more than 10 kA. Based on calculation results, we fabricated a 2-m-long LMF power cable and a conventional-design power cable. Experimental results show that the proposed power cable can carry more current (8.8% more current per tape and 18% more current overall) than a conventional-design power cable due to the LMF effect. These results well agree with the theoretical calculation results.

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TCP network coding with adapting parameters for bursty and time-varying loss

TCP network coding with adapting parameters for bursty and t...

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作者： Ha, Nguyen Viet Kumazoe, Kazumi Tsuru, Masato University of Science Ho Chi Minh City Viet Nam Network Design Research Center Kyushu Institute of Technology Iizuka-shi820-8502 Japan Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizukashi820-8502 Japan

The Transmission Control Protocol (TCP) with Network Coding (TCP/NC) was proposed to introduce packet loss recovery ability at the sink without TCP retransmission, which is realized by proactively sending redundant combination packets encoded at the source. Although TCP/NC is expected to mitigate the goodput degradation of TCP over lossy networks, the original TCP/NC does not work well in burst loss and timevarying channels. No apparent scheme was provided to decide and change the network coding-related parameters (NC parameters) to suit the diverse and changeable loss conditions. In this paper, a solution to support TCP/NC in adapting to mentioned conditions is proposed, called TCP/NC with Loss Rate and Loss Burstiness Estimation (TCP/NCwLRLBE). Both the packet loss rate and burstiness are estimated by observing transmitted packets to adapt to burst loss channels. Appropriate NC parameters are calculated from the estimated probability of successful recoverable transmission based on a mathematical model of packet losses. Moreover, a new mechanism for coding window handling is developed to update NC parameters in the coding system promptly. The proposed scheme is implemented and validated in Network Simulator 3 with two different types of burst loss model. The results suggest the potential of TCP/NCwLRLBE to mitigate the TCP goodput degradation in both the random loss and burst loss channels with the time-varying conditions. © 2018 The institute of Electronics, Information and Communication Engineers.

关键词： Transmission control protocol

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A New THL model for high accuracy of predicted journal surface temperature

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Toraibarojisuto/Journal of Japanese Society of Tribologists 2018年第5期63卷 360-367页

作者： Hatakenaka, Kiyoshi Baba, Yoshitaka Kämeyama, Yuki Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-shi Fukuoka820-8502 Japan Technical Development Department Development Center Machinery Business KOBE STEEL Ltd. 3-1 Shinhama 2-chome Arai-cho Takasago-shi Hyogo676-8670 Japan

A thermo-hydrodynamic lubrication (THL) theory is applied to journal bearings that support large-sized high-speed rotary machineries and it is confirmed that the maximum pad surface temperature under operation is below an allowable limit value. The temperature predicted by the traditional THL model is in good agreement with the measurement. However, the predicted journal surface temperature is not comparable with the measurement. In the present paper, it is firstly shown that the amount of heat, which is generated by the shear flow in the oil film and is discharged out of the film, is evaluated appropriately in the film near the pad surface while it is evaluated excessively in the film near the journal surface. Secondly, a new THL model is proposed that the oil film temperature near the pad surface and the temperature near the journal surface are obtained independently, that is, the conventional energy equation for the oil film is solved for the former temperature while the equation described in the relative coordinate system with the journal surface as the reference one is used for the latter temperature. Lastly, it is shown that the THL model can predict the journal surface temperature comparable with the measurement without deteriorating the accuracy of the predicted maximum pad surface temperature. © 2018 Japanese Society of Tribologists. All rights reserved.

关键词： Surface temperature

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Control design considering magnetic flux characteristic uncertainty for magnetic levitation system with magnetic flux and current feedback

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2019年第10期139卷 1159-1166页

作者： Urasaki, Shinpachiro Kobayashi, Yoshimitsu Kami, Yasushi Mitani, Yuichiroh Nobuyama, Eitaku Department of Electronic Control Engineering National Institute of Technology Gifu College 2236-2. Kamimakuwa. Motosu. Gifu 501-0495 Japan Department of Electrical and Computer Engineering National Institute of Technology Akashi College 679-3. Nishioka. Uozumi Akashi. Hyogo674-8501 Japan Department of Mechanical Engineering National Institute of Technology Numazu College 3600. Ooka. Numazu Shizuoka410-8501 Japan Department of Systems Innovation and Informatics Faculty of Computer Science and System Engineering Kyushu Institute of Technology 680-4.Kawazu. Iizuka Fukuoka820-8502 Japan

This paper describes control design considering magnetic flux characteristic uncertainty for magnetic levitation system with magnetic flux and current feedback. The position of the levitated object is calculated from the hall voltage and current of the electromagnet. We show the uncertainty for magnetic flux characteristic and design the stabilizing controller by proportional feedback with the hall voltage and current. Moreover, we tried to design servo controller by two-degree-of-freedom control by using a finite number of frequency response (FNFR) model including the uncertainty and confirmed the validity of the proposed method by experiment results. © 2019 The institute of Eleclrical Engineers of Japan.

关键词： Frequency response

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Estimation of Machine Parameters in Superconducting Transformer using Differential Evolution

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Journal of Physics: Conference Series 2020年第1期1590卷

作者： T Yonenaka T Muraoka Y Ichiki E S Otabe Y Tokunaga Department of Computer Science and Electronics Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Faculty of Computer Science and Systems Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan

To analyze the inrush current in a superconducting transformer, the machine parameters for the transformer were estimated from the measured current using a search algorithm. To address the large rising edge error in estimations performed using a genetic algorithm (GA), a differential evolution (DE) was used in this study. As a result, the estimated time was reduced to about 1/10 that obtained with GA, and the evaluation value indicating the difference between the measured value and the estimated value was reduced to about 1/2. Thus, it was possible to estimate with higher accuracy by using DE.

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Micro tool diameter monitoring by means of laser diffraction for on-machine measurement

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International Journal of Automation technology 2017年第5期11卷 736-741页

作者： Khajornrungruang, Panart Kimura, Keiichi Suzuki, Keisuke Inoue, Tomoki Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-shi Fukuoka820-8502 Japan School of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka820-8502 Japan

This study proposes a non-contact measurement method for evaluating a micro cutting tool diameter at a sub-micrometer precision in atmospheric environment. Practically, non-contact tool measurements are widely used in optical measurement methods. However, the generally used geometrical optical measurement methods do fundamentally not have submicrometer precision due to well-known light diffraction phenomenon, notably when measuring a micro tool. We have been proposing and developing a measurement method especially for the micro tool utilizing laser diffraction. In this study, we subtracted a transparent light component from a laser light distribution diffracted by the micro tool to be measured to enhance diffraction pattern characteristics. Consequently, micro rods having diameters of 15, 20, and 30 µm could be precisely measured. Furthermore, in order to verify themethod validity, a two-helical-fluted micro tool (20 micrometer in diameter) was also measured while rotating (4 min-1) with less than 400 nm difference compared to images from a scanning electron microscopy (SEM) image. Finally, a trial to measure a micro drill diameter was also carried out during high-speed tool rotation (136,800 min-1) with our developed apparatus that is enough compact to be installed to machine tools, in order to perform the measurement in real rotation without stopping the tool rotation. © 2017, Fuji technology Press. All rights reserved.

关键词： Cutting tools

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Industrial Wireless LAN system Compatible with Asynchronous Communication

Industrial Wireless LAN System Compatible with Asynchronous ...

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2018 International Symposium on Intelligent Signal Processing and Communication systems, ISPACS 2018

作者： Tsurita, Makoto Ochi, Hiroshi Sakamoto, Kyoshiro Toyofuku, Mizuki Itou, Yoshiki Nguyen, Tran Thi Thao Uwai, Tatsumi Nagao, Yuhei Kurosaki, Masayuki Sai, Baiko Graduate Shcool of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka820-8502 Japan Daiichi Institute of Technology Department of Information Technology and Electronical Engineering 1-10-2 Kokubu-chuo Kirishima Kagoshimag899-4395 Japan

ISBN: (纸本)9781538657713

In this research, we propose an industrial Wireless Local Area Network (iWLAN) system compatible with asynchronous communication for industrial robots (iRBs) control in factory automation (FA) environments. In FA, iRBs are not only controlled by synchronous communication but also by asynchronous communication. As our conventional system is not compatible with asynchronous communication, it causes delay when iRBs are controlled by asynchronous communication. In order to target iRBs using asynchronous communication, we propose the utilization of specific memory writing technique. The register transfer level (RTL) simulation results show that our proposals can communicate with iRBs in faster throughput, better than the conventional system. Furthermore, the field-programmable gate array (FPGA) implementation are carried out to confirm that motors can be controlled by our iWLAN system compatible with asynchronous communication. © 2018 IEEE.

关键词： Industrial robots

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Penetration Testing Framework for IoT

Penetration Testing Framework for IoT

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IIAI International Conference on Advanced Applied Informatics (IIAIAAI)

作者： Geeta Yadav Alaa Allakany Vijay Kumar Kolin Paul Koji Okamura School of Information Technology IIT Delhi India Cybersecurity Center Kyushu University Japan Faculty of Computers and Information Kafrelsheikh University Egypt Department of Computer Science & Engineering IIT Delhi India Research Institute for Information Technology Kyushu University Japan

ISBN: (纸本)9781728126289

In the Internet of Things (IoT) environment, objects are connected on a network to share data. However, most of the IoT devices are developed and deployed with poor security consideration. As a result, these devices become a target of attacks. A solution for ensuring the safety and security of a network system is Penetration testing. In this study, we propose a framework for automated and flexible penetration testing for IoT network. Most of the available penetration testing methods are experts based, that select tool and process manually. This kind of Pen-test is a costly, time-consuming and inefficient. Also, the existing automated penetration testing doesn't consider the interaction between system components; it works by testing each component of a system separately. Individual component testing can lead to a security gap that makes the Pen-test inefficient since many low severity vulnerabilities on different inter-connected components can lead the system to an insecure state. Moreover, in some cases testing the individual components can claim that the particular component is secure, but if these individual components are connected in one system, it makes this system insecure. Due to such shortages, our framework will test the End-to-End target system (i.e., end devices, wireless communication, the control unit, then communication to the cloud server, and finally communication from the cloud to end user through mobile app or webpage). The proposed framework will automatically gather the information of the target IoT network and then perform various kinds of penetration testing through the network. Then it will summarize the results of Pentest and gives the recommendations to secure the system.

关键词： Internet of Things mobile computing program testing security of data PENETRANT TESTS Internet of things program testing Data Security Mobile Computing safety distance Frameworks Mobile Applications component test

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Front Cover: Water-in-Water Droplets Selectively Uptake Self-Assembled DNA Nano/Microstructures: a Versatile Method for Purification in DNA Nanotechnology (ChemBioChem 17/2022)

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ChemBioChem 2022年第17期23卷

作者： Dr. Marcos K. Masukawa Prof. Dr. Yusuke Sato Dr. Fujio Yu Prof. Dr. Kanta Tsumoto Prof. Dr. Kenichi Yoshikawa Prof. Dr. Masahiro Takinoue Department of Computer Science Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama Kanagawa 226-8502 Japan Frontier Research Institute for Interdisciplinary Sciences Tohoku University 6-3 Aramaki-Aza Aoba Aoba-ku Sendai Miyagi 980–8578 (Japan) Department of Intelligent and Control Systems Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Division of Chemistry for Materials Graduate School of Engineering Mie University 1577 Kurimamachiya-cho Tsu Mie 514-8507 Japan Center for Integrative Medicine and Physics Institute for Advanced Study Kyoto University Yoshida Ushinomiya-cho Sakyo-Ku Kyoto 606-8501 Japan Faculty of Life and Medical Sciences Doshisha University 1-3 Tataramiyakodani Kyotanabe Kyoto 610-0394 Japan

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Robustness of DNA Strand Displacement systems⋆⁎

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IFAC-PapersOnLine 2018年第33期51卷 32-37页

作者： Nakakuki, Takashi Imura, Jun-ichi Kawamata, Ibuki Murata, Satoshi Department of Systems Design and Informatics School of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu IizukaFukuoka820-8502 Japan Department of Mechanical and Environmental Informatics Tokyo Institute of Technology 2-12-1-W8-1 O-okayama Meguro-ku Tokyo152-8552 Japan Department of Robotics Graduate School of Engineering Tohoku University 6-6-1 Aoba Aramaki-Aza Aoba-Ward SendaiMiyagi980-8579 Japan

How to construct a reliable deoxyribonucleic acid (DNA) circuit is one of the most important issues in the field of molecular programming and computing. Such a circuit frequently suffers from various kinds of unintended binding reactions on account of a lower specificity of the molecular interaction emerging from base complementarity between DNA strands, which results in low reliability of the molecular circuit. In this study, we propose a method to quantitatively evaluate the robustness of a DNA circuit created by DNA strand displacement reactions. The highlight of our method is representing the circuit system contaminated by unintended reactions by a standard form of a disturbed nonlinear system and evaluating the robustness with the L2 gain by solving the Hamilton–Jacobi inequality. © 2018

关键词： Nucleic acids Differential equations DNA Electric network analysis Large scale systems Nonlinear equations Substitution reactions Binding reactions Circuit systems Dna strand displacements DNA strands Molecular circuits Molecular programming Nonlinear circuit Uncertainty

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