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Studies on Noise Reduction of Optically Pumped Magnetometers by Digital Signal Processing
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2025-01-04 DOI: 10.1002/ecj.12470
Kouta Nambu, Yosuke Ito
{"title":"Studies on Noise Reduction of Optically Pumped Magnetometers by Digital Signal Processing","authors":"Kouta Nambu,&nbsp;Yosuke Ito","doi":"10.1002/ecj.12470","DOIUrl":"https://doi.org/10.1002/ecj.12470","url":null,"abstract":"<div>\u0000 \u0000 <p>Recently, optically pumped magnetometers (OPMs), which use the spin polarization of alkali metal atoms to measure magnetic fields, have attracted much attention. However, in order to realize high-sensitivity biomagnetic field measurements using OPMs, it is necessary to reduce environmental magnetic noise and system noise. In this study, we investigate the effectiveness of the noise reduction of OPM signals when principal component analysis, independent component analysis, and empirical mode decomposition are used for signal processing.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stability Analysis Considering PLL Effects for Grid-Following Inverter by Complex Vector Control
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2025-01-04 DOI: 10.1002/ecj.12477
Yoshio Tamari, Toshiji Kato, Kaoru Inoue
{"title":"Stability Analysis Considering PLL Effects for Grid-Following Inverter by Complex Vector Control","authors":"Yoshio Tamari,&nbsp;Toshiji Kato,&nbsp;Kaoru Inoue","doi":"10.1002/ecj.12477","DOIUrl":"https://doi.org/10.1002/ecj.12477","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper analyzes the stability of a grid-following inverter by the complex vector control in <i>αβ</i> domain and by the PLL synchronization control in <i>dq</i> domain. It is known that the frequency transfer function of the PLL may affect mutual interactions between grid and line impedances. This paper analyzes the frequency characteristics of the inverter based on the mixed-domain control for stability by the impedance method. Considering frequency coupling effects by the PLL control, it is found that the passivity of the inverter is violated and it may become unstable for a weak grid. This result is validated by analytical derivation, simulation, and experiment.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of Magnetic Hammering Test Using Tunnel Magneto-Resistive Sensor
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2025-01-03 DOI: 10.1002/ecj.12469
Jun Ito, Yudai Igarashi, Mikihiko Oogane
{"title":"Development of Magnetic Hammering Test Using Tunnel Magneto-Resistive Sensor","authors":"Jun Ito,&nbsp;Yudai Igarashi,&nbsp;Mikihiko Oogane","doi":"10.1002/ecj.12469","DOIUrl":"https://doi.org/10.1002/ecj.12469","url":null,"abstract":"<div>\u0000 \u0000 <p>We have developed a novel nondestructive inspection technique for infrastructures using spintronics technologies. Since the tunnel magneto-resistance (TMR) effect has become dramatically more sensitive in recent years, TMR sensors can be applied to the highly sensitive nondestructive inspection named magnetic hammering test (MHT). The proposed MHT technique is based on the principle of detecting slight fluctuations in the spatial magnetic field caused by the vibration of steel materials. Since the fluctuations in the magnetic field occur with the natural vibration frequency of the steel materials, their condition can be detected from the change of natural frequency using highly sensitive TMR sensors. In this work, we have demonstrated that the size of steel plates was determined with high accuracy using the MHT technique.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of Lightweight and Flexible Electromagnetic Shielding Materials Using Carbon Nanotube-Based Composites
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2025-01-02 DOI: 10.1002/ecj.12478
Naoaki Yoshida, Fuma Kondo, Tetsuo Soga, Naoki Kishi
{"title":"Development of Lightweight and Flexible Electromagnetic Shielding Materials Using Carbon Nanotube-Based Composites","authors":"Naoaki Yoshida,&nbsp;Fuma Kondo,&nbsp;Tetsuo Soga,&nbsp;Naoki Kishi","doi":"10.1002/ecj.12478","DOIUrl":"https://doi.org/10.1002/ecj.12478","url":null,"abstract":"<div>\u0000 \u0000 <p>The recent development of wireless communication technology has increased the risk of electronic equipment malfunctions and information leaks. To address this issue, we developed and evaluated a lightweight and flexible electromagnetic shielding material that can be applied to wearable devices by combining carbon nanotubes and elastomer materials.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quartz Oscillator Based Complex Capacitive Sensor for Nondestructive Sensing Inside RC Structures
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2025-01-02 DOI: 10.1002/ecj.12483
Taketeru Yokoyama, Ryosuke Takahashi, Keigo Iwamoto, Masayuki Sohgawa, Takashi Abe
{"title":"Quartz Oscillator Based Complex Capacitive Sensor for Nondestructive Sensing Inside RC Structures","authors":"Taketeru Yokoyama,&nbsp;Ryosuke Takahashi,&nbsp;Keigo Iwamoto,&nbsp;Masayuki Sohgawa,&nbsp;Takashi Abe","doi":"10.1002/ecj.12483","DOIUrl":"https://doi.org/10.1002/ecj.12483","url":null,"abstract":"<div>\u0000 \u0000 <p>This research developed a complex capacitance sensor using a quartz oscillator for non-invasively imaging of a rebars position in reinforced concrete structures. The use of different electrode structures and a floating electrode located on the backside allowed for control of the sensing depth. This technology is expected to realize a simpler maintenance and management process for infrastructure quality.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Event-Triggered Robust Control of Robot Manipulators 机器人机械手的事件触发鲁棒控制
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2024-11-20 DOI: 10.1002/ecj.12463
Xiao-Xuan Zhao, Zi-Jiang Yang
{"title":"Event-Triggered Robust Control of Robot Manipulators","authors":"Xiao-Xuan Zhao,&nbsp;Zi-Jiang Yang","doi":"10.1002/ecj.12463","DOIUrl":"https://doi.org/10.1002/ecj.12463","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper proposes a new event-triggered robust control system for robot manipulators, based on two event-triggered mechanisms (ETMs), which lead to intermittent communication not only for the sensor-to-controller channel but also for the controller-to-actuator channel. The proposed control system enjoys the advantage of requiring fewer resources of data communication and less signal updating of the control actuators. The control performance of the proposed control system is analyzed based on the Lyapunov approach. Furthermore, the absence of the Zeno behavior in the triggering sequence is proved rigorously. Finally, experiments are carried out on a two-link robot manipulator system to support the theoretical results.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"107 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Hardware Chaotic Neural Network With Gap Junction Models 具有间隙连接模型的硬件混沌神经网络
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2024-11-15 DOI: 10.1002/ecj.12467
Takuto Yamaguchi, Katsutoshi Saeki
{"title":"A Hardware Chaotic Neural Network With Gap Junction Models","authors":"Takuto Yamaguchi,&nbsp;Katsutoshi Saeki","doi":"10.1002/ecj.12467","DOIUrl":"https://doi.org/10.1002/ecj.12467","url":null,"abstract":"<div>\u0000 \u0000 <p>We aim at the engineering applications of reservoir computing using hardware chaotic neural networks, including associative memory recall. The reservoir layer used in reservoir computing is networked and constructed using pulse-type hardware chaos neuron models (P-HCNMs). The structure of the reservoir layer is simple, which is advantageous for hardware implementation. By inducing chaos in the reservoir layer, it is possible to use the “chaotic edge” where the reservoir reaches its highest efficiency. It has also been reported that incorporating self-correction within the reservoir layer increases the efficiency of the task. In this paper, we constructed a hardware small-world neural network using a synaptic model with spike timing-dependent synaptic plasticity (STDP) and a gap junction model. As a result, it is clarified that all cell body models with synaptic model connections show chaotic firing by simulation at the same time, and that the STDP model enables learning while keeping the chaotic phenomena. In addition, comparison with the firing of cell body models coupled only with synaptic models suggested that the gap junction model works significantly in inducing chaos in neural networks.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"107 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of Controlling Assist Robots to Follow Lumbar Load on Muscle Fatigue 控制辅助机器人跟随腰负荷对肌肉疲劳的影响
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2024-11-09 DOI: 10.1002/ecj.12468
Yusuke Yoshida, Takashi Kamezaki, Daisuke Kushida
{"title":"Effects of Controlling Assist Robots to Follow Lumbar Load on Muscle Fatigue","authors":"Yusuke Yoshida,&nbsp;Takashi Kamezaki,&nbsp;Daisuke Kushida","doi":"10.1002/ecj.12468","DOIUrl":"https://doi.org/10.1002/ecj.12468","url":null,"abstract":"<div>\u0000 \u0000 <p>We developed an assist robot that changes its assist force in real time according to the lumbar load estimated from the load information on the hand measured using a hand sensor device and the posture information. Furthermore, using the developed assist robot, the effect of the load-following control on muscle fatigue was verified. The load was set at 6 and 1 kgf, and the amount of muscle activity in the lumbar region was measured using a muscle potential sensor during continuous flexion–extension exercises. The central frequency of the power spectrum was calculated as muscle fatigue, and its time trend was obtained. For comparison, similar experiments were also conducted without an assistive robot and with an existing assistive robot. Consequently, when load-following control was used, muscle fatigue was reduced compared with existing assist robots in which the assist force was excessive in relation to the load. This shows the importance of load-following control that is necessary to control the assist force according to the load when the assist robot is worn during work in which the load changes in a complex manner.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"107 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Absolute Train Localization Based on the Identification of Surrounding Structures Using 1D LiDAR Sensor 基于周围结构识别的一维激光雷达列车绝对定位
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2024-11-05 DOI: 10.1002/ecj.12464
Kensuke Nagai, Wataru Ohnishi, Takafumi Koseki
{"title":"Absolute Train Localization Based on the Identification of Surrounding Structures Using 1D LiDAR Sensor","authors":"Kensuke Nagai,&nbsp;Wataru Ohnishi,&nbsp;Takafumi Koseki","doi":"10.1002/ecj.12464","DOIUrl":"https://doi.org/10.1002/ecj.12464","url":null,"abstract":"<div>\u0000 \u0000 <p>Train localization is an essential technology for effective train control. Currently, train localization primarily relies on using track circuits and balises, which are placed along the track to provide precise location information. However, balises have to be placed at intervals of a few kilometers. This increases maintenance costs and makes them vulnerable to being damaged by ice blocks falling from moving trains. Therefore, in this study, we propose a method for absolute train localization based on structure detection and identification using a 1D light detection and ranging (LiDAR) sensor to reduce the number of balises. Structure identification is achieved using scan matching. In the experiments using a car, the proposed method achieved an identification success rate of over 90%. We also considered the effect of raindrops by filtering the measurement data. By testing and analyzing the identification results, we successfully reduced all cases of misidentification.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"107 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of Numerical Analysis Method for Cathode Sheath Considering Electron Emission From Cathode in Vacuum Arc 考虑真空电弧中阴极电子发射的阴极护套数值分析方法的发展
IF 0.5 4区 工程技术
Electronics and Communications in Japan Pub Date : 2024-11-04 DOI: 10.1002/ecj.12465
Masahiro Takagi, Hiroto Suzuki, Yuki Suzuki, Yusuke Nemoto, Toru Iwao, Tatsuhito Nakajima
{"title":"Development of Numerical Analysis Method for Cathode Sheath Considering Electron Emission From Cathode in Vacuum Arc","authors":"Masahiro Takagi,&nbsp;Hiroto Suzuki,&nbsp;Yuki Suzuki,&nbsp;Yusuke Nemoto,&nbsp;Toru Iwao,&nbsp;Tatsuhito Nakajima","doi":"10.1002/ecj.12465","DOIUrl":"https://doi.org/10.1002/ecj.12465","url":null,"abstract":"<div>\u0000 \u0000 <p>It is imperative to develop the simulation of vacuum arcs as a tool to aid electrode design in vacuum circuit breakers. Although the development of electromagnetic thermo-fluid simulations for vacuum arcs has been reported, most of them do not take cathode sheath phenomena into account and have not been able to reproduce vacuum arc phenomena, especially cathode spots. As the first step, the cathode sheath voltage, cathode surface electric field, and temperature and field (T-F) electron emission current were analyzed numerically on the basis of the space charge in the cathode sheath. In this study, the cathode sheath was assumed to exist when the charge density induced on the cathode surface is positive, and the temperature and density of vacuum arc plasma and cathode temperature, which are physical quantities obtained by electromagnetic thermo-fluid simulation, were used as parameters of the analysis. As a result, the cathode sheath voltage, electric field, and electron emission current density can be calculated from the vacuum arc plasma temperature, density, and cathode temperature. Numerical results show that the electron emission current density has a dominant effect on the presence or absence of the cathode sheath.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"107 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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