Electronics and Communications in Japan最新文献_第9页

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

Tactile sensor with microcantilevers embedded in fluoroelastomer/PDMS for physical and chemical resistance 触觉传感器与微悬臂嵌入氟弹性体/PDMS的物理和耐化学性

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-05 DOI: 10.1002/ecj.12369

Yuji Takahashi, Takumi Takahashi, Takashi Abe, Haruo Noma, Masayuki Sohgawa

引用次数: 0

Pen-type pulse wave measurement system for detecting pathological changes in cardiac diseases 用于检测心脏疾病病理变化的笔式脉搏波测量系统

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-05 DOI: 10.1002/ecj.12376

Kosei Yamada, Kazuki Watatani, Kyohei Terao, Fusao Shimokawa, Hidekuni Takao

引用次数: 0

Computerized classification method for histological classification of masses on breast ultrasonographic images using convolutional neural networks with ROI pooling 基于ROI池化卷积神经网络的乳腺超声图像肿块组织分类方法

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-05 DOI: 10.1002/ecj.12368

Akiyoshi Hizukuri, Shinya Kunieda, Ryohei Nakayama

{"title":"Computerized classification method for histological classification of masses on breast ultrasonographic images using convolutional neural networks with ROI pooling","authors":"Akiyoshi Hizukuri, Shinya Kunieda, Ryohei Nakayama","doi":"10.1002/ecj.12368","DOIUrl":"https://doi.org/10.1002/ecj.12368","url":null,"abstract":"It can be difficult for clinicians to correctly determine histological classifications of masses on breast ultrasonographic images. The purpose of this study was to develop a computerized classification method for histological classification of masses on breast ultrasonographic images using convolutional neural networks (CNN) with a ROI pooling that analyzes feature maps focusing on the mass region. Our dataset consisted of 585 breast ultrasonographic images obtained from 585 patients. It included 288 malignant masses (218 invasive and 70 noninvasive carcinomas) and 297 benign masses (115 cysts and 182 fibroadenomas). In this study, we developed a modified CNN model based on ResNet-18, in which the ROI pooling and two fully connected layers with a softmax function were introduced after the second and fourth residual block on ResNet-18, respectively. The proposed CNN model was employed to distinguish among four different types of histological classifications for masses. A three-fold cross validation method was used for training and testing the proposed CNN model. The average accuracy, sensitivity, specificity, positive predictive value and negative predictive value for the proposed CNN model were 81.7%, 91.0%, 91.2%, 91.0%, and 91.2%, respectively. Those results were substantially greater than those with ResNet-18 (70.3%, 83.0%, 87.2%, 86.3%, and 84.1%).","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"105 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137796829","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

Application development and practice model for radiation education 辐射教育的应用开发与实践模式

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-04 DOI: 10.1002/ecj.12373

Ieyasu Tokumoto, Toyokazu Hirozumi, Masaru Sakai, Junko Nishiwaki, Chihiro Kato, Kunio Watanabe, Masaru Mizoguchi, Yohei Ishikawa

引用次数: 0

Precision beam shaping by spatial frequency filtering 空间频率滤波的精确波束整形

IF 0.3 4区工程技术

Electronics and Communications in Japan Pub Date : 2022-08-04 DOI: 10.1002/ecj.12365

Yoshiki Nakata, Yuto Hirakawa, Kazuhito Osawa, Koji Tsubakimoto, Hiroyuki Shiraga

引用次数: 0