Electronics and Communications in Japan最新文献_第10页

Attenuation band impedance matched BRF for measurements of electromagnetic noise 衰减带阻抗匹配BRF测量电磁噪声

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-10-17 DOI: 10.1002/ecj.12378

Jun Hayashi, Yoshio Nikawa

{"title":"Attenuation band impedance matched BRF for measurements of electromagnetic noise","authors":"Jun Hayashi, Yoshio Nikawa","doi":"10.1002/ecj.12378","DOIUrl":"https://doi.org/10.1002/ecj.12378","url":null,"abstract":"Wireless communication devices such as wireless LANs and RFIDs are essential for smart home appliances and IoT (Internet of Things) devices in Smart Cities. When measuring the high-frequency noise generated by devices, wireless signals of wireless communication devices and high-frequency noise are measured at the same time. As a result, spectrum analyzers have insufficient dynamic range, or the excess signal from wireless communication devices causes harmonic distortion of the mixer inside the receiver, resulting in inaccurate measurements. Accordingly, a band rejection filter (BRF) is required to attenuate the radio signal. CISPR 16-2-3:2016+A1: 2019 assumes that impedances are matched for measurement, so if the impedance mismatch is large, the expanded uncertainty specified in CISPR 16-4-2:2011+A1:2014+A2:2018 increases. In this study, we propose a new BRF with impedance matching in the attenuation range and show its principle. As a result, the extended uncertainty could be reduced to 3.96 dB for the BRF of this study compared to 10.63 dB for the conventional BRF. In addition, the method comparison of CISPR 16-2-3:2016+A1: 2019 and vector network analyzer shows that the difference in attenuation of the conventional BRF was about −0.8 to 3.3 dB, whereas the BRF in this study were about −0.2 to 0.3 dB. The reduction of the expanded uncertainty and the good measurement results confirm the high usefulness of the CISPR 16-2-3 measurement system for the measurement of weak electromagnetic noise.","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"105 4","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137692553","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

Evaluation of potential for peak demand reduction of residential buildings by household appliances with demand response 用有需求响应的家用电器来评估减少住宅高峰需求的潜力

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-10-17 DOI: 10.1002/ecj.12379

Tetsushi Ono, Aya Hagishima, Jun Tanimoto

引用次数: 0

Assist control for human-robot cooperative transportation systems using nonlinear disturbance observer 基于非线性扰动观测器的人-机器人协同运输系统辅助控制

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-10-17 DOI: 10.1002/ecj.12382

Yuki Okura, Tomohiro Nakada, Chiaki Kojima

引用次数: 0

Enhancement of photocatalytic degradation by combination of light illumination and bias voltages toward anti-virus coating applications 光照明和偏置电压相结合增强光催化降解对抗病毒涂层应用的影响

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-10-14 DOI: 10.1002/ecj.12381

Keita Shimakura, Sho Saeki, Yuta Segawa, Taizo Kobayashi

引用次数: 0

Examination of insulation diagnosis in substation by neural network with phase-resolved partial discharge pattern reconstruction 基于相位分解局部放电模式重构的神经网络在变电站绝缘诊断中的应用

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-09-20 DOI: 10.1002/ecj.12360

Shunya Fujioka, Hideaki Kawano, Masahiro Kozako, Masayuki Hikita, Osamu Eda, Shuhei Yaguchi, Yasuharu Shiina

引用次数: 0

Evaluation of transmission characteristics of differential and common modes of parallel two-conductor microstrip lines with a Co-Zr-Nb film Co-Zr-Nb薄膜并联两导体微带线差分和共模传输特性的评价

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-09-05 DOI: 10.1002/ecj.12370

Masataka Masaki, Sho Muroga, Takahiro Mikami, Motoshi Tanaka

引用次数: 0

An optimization under uncertainty in system equations and applications to robust AC optimal power flow 系统方程不确定条件下的优化及其在鲁棒交流最优潮流中的应用

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-23 DOI: 10.1002/ecj.12361

Ryohei Suzuki, Keiichiro Yasuda, Eitaro Aiyoshi

{"title":"An optimization under uncertainty in system equations and applications to robust AC optimal power flow","authors":"Ryohei Suzuki, Keiichiro Yasuda, Eitaro Aiyoshi","doi":"10.1002/ecj.12361","DOIUrl":"https://doi.org/10.1002/ecj.12361","url":null,"abstract":"This paper presents a formulation of an optimization of uncertain systems and the solution technique. The optimization under uncertainties is formulated as an optimization problem which includes unknown variables in equality constraints called system equations as well as in an objective function and inequality constraints. As countermeasures against the uncertainties, a min-max criterion is applied to the objective function and robustness criteria are introduced to the inequality constraints. By differentiating state variables satisfying the equality constraints from the decision variables, we reformulate the optimization problem based on the worst-case scenario of the state variables corresponding to the uncertain variables and we propose a “constraints-relaxation procedure” based method considering the equality constraints to solve the reformulated problem. In this method, a constraints-relaxed problem is solved corresponding to a finite number of samples of uncertain variables. Furthermore, a new sample of uncertain variables is sequentially generated corresponding to the inequality constraint which the solution violates most, together with state variables satisfying the system equations at the new worst-case scenario. Finally, the effectiveness of the proposed method is illustrated by numerical examples including robust AC optimal power flow considering distributed energy resources.","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"105 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137970836","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 novel pneumatic skin sensory stimulator and its application to a two-point discrimination test 一种新型气动皮肤感官刺激器及其在两点判别试验中的应用

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-18 DOI: 10.1002/ecj.12362

Fumitaka Hashikawa, Shota Mizunuma, Satsuki Ofuchi, Riichi Kajiwara

{"title":"A novel pneumatic skin sensory stimulator and its application to a two-point discrimination test","authors":"Fumitaka Hashikawa, Shota Mizunuma, Satsuki Ofuchi, Riichi Kajiwara","doi":"10.1002/ecj.12362","DOIUrl":"https://doi.org/10.1002/ecj.12362","url":null,"abstract":"We have developed a tactile stimulation system that can apply air puffs locally to any two points on a skin's surface. This system consists of an air output device and a reaction recording device, both controlled by dedicated software. The air output device is equipped with a microcontroller ESP32, which can produce an airflow from two ports by controlling the intensity of the compressed air, the duration of its output, and the inter-trial time interval between applications. The reaction recording device is equipped with a push-button to record the subject's response when the air is applied to the skin. We verified the applicability of this system by a two-point discrimination test. In 14 healthy human subjects, the shortest distance at which they correctly answered that the given air was at two points was 35 mm. When we applied the air at 30 mm, the majority of the human subjects answered incorrectly that the air was only at one point when in fact it was at two points. This result was in close agreement with previously reported results obtained by direct skin stimulation methods.","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"105 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137693328","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

Fabrication and characteristics of electret using fine silica powder and its application of ultrasonic sensor 细硅粉驻极体的制备、特性及其在超声传感器中的应用

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-13 DOI: 10.1002/ecj.12372

Kensuke Kageyama, Kakeru Kobayashi, Yoshiaki Kawada, Takenobu Sakai

{"title":"Fabrication and characteristics of electret using fine silica powder and its application of ultrasonic sensor","authors":"Kensuke Kageyama, Kakeru Kobayashi, Yoshiaki Kawada, Takenobu Sakai","doi":"10.1002/ecj.12372","DOIUrl":"https://doi.org/10.1002/ecj.12372","url":null,"abstract":"Electrets were prepared by spin-coating the dispersion of fine silica powders, and their charge retention characteristics were investigated. Finer silica aggregates were formed on the PTFE surface layer by spin-coating the dispersed solution of fine silica powder than those formed by spray-coating colloidal silica. Electrets using fine silica powder also showed better charge retention characteristics than those using colloidal silica. Such an improvement in the charge retention might be due to the suppression of discharge in the excessive gap caused by coarse silica aggregates. Then, ECSs were fabricated using the prepared electrets, and their transmitting and receiving characteristics of airborne ultrasound were also investigated. The peak sensitivity of the ECS using a spin coating of fine powdered silica dispersion was slightly improved from those using spray coating of colloidal silica. On the other hand, the peak frequency and frequency band were greatly improved using spin coating of fine powdered silica dispersion. Therefore, ECS using fine silica powder is expected to be applied as a broadband airborne ultrasonic sensor.","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"105 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137509826","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 fiber-optic pressure sensor utilizing magneto-optical effect 利用磁光效应的光纤压力传感器的研制

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-06 DOI: 10.1002/ecj.12375

Mitsunori Miyamoto, Tetsuya Aiba, Satoshi Sue, Toshiya Kubo

引用次数: 0