Electronics and Communications in Japan最新文献

Indoor Person Position Estimation With Channel State Information With Privacy Consideration

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-02-20 DOI: 10.1002/ecj.12481

Hidekazu Yanagimoto, Wataru Tokioka, Kiyota Hashimoto, Tokuro Matsuo

引用次数: 0

Proposal and Evaluation of a Pitch Estimation Model Based on Reconstruction of the Spectrum of Input Sound by Using Timbre Information and Pitch Information

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-02-12 DOI: 10.1002/ecj.12482

Ryoji Kawa, Hideki Banno, Kensaku Asahi

引用次数: 0

Development of Assembly Techniques for Miniaturized In-Line Pressure Sensor by Utilizing Thin Strain Sensor for High Reliability

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-02-07 DOI: 10.1002/ecj.12479

Hiroshi Ikeda, Masatoshi Kanamaru, Takanori Aono

{"title":"Development of Assembly Techniques for Miniaturized In-Line Pressure Sensor by Utilizing Thin Strain Sensor for High Reliability","authors":"Hiroshi Ikeda, Masatoshi Kanamaru, Takanori Aono","doi":"10.1002/ecj.12479","DOIUrl":"https://doi.org/10.1002/ecj.12479","url":null,"abstract":"<div>\u0000 \u0000 <p>High-reliability assembly techniques for miniaturized in-line pressure sensor with diaphragm using a thin strain sensor have been developed to monitor the hydraulic pressure in the pipetting such as dispensing devices. The pressure sensor with a thin strain sensor as a diaphragm has two problems, (i) water leakage and (ii) sensitivity reduction by adding hydraulic pressure. These problems were clarified to generate tensile stress in the adhesive (Ag paste) by adding hydraulic pressure and peeling a strain sensor from SUS housing. To overcome these problems, the stress in Ag paste was needed to keep compressive stress even when adding pressure. In this paper, a pressing mechanism is newly proposed to make compressive stress in Ag paste and assemble on the pressure sensor. First, to press the strain sensor to the SUS housing, a lid was bonded on the strain sensor with wafer-level-packaging (WLP) technique. Next, a pressing mechanism was designed to assemble the miniaturized pressure sensor. The pressing mechanism was composed of a cover, two coil springs, and a spring base with a pressing point. The pressing mechanism generates compressive stress to Ag paste even under high hydraulic pressure. The pressure sensor which implements the pressing mechanism has high-pressure resistance and high reliability under the repetitive hydraulic pressure of 10 million times, without water leakage and sensitivity decrease.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571326","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

Real-Time Sensing Technology of Mixed Gas Concentrations Using Multiple Micromachined Thermal Conductivity Detectors

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-02-04 DOI: 10.1002/ecj.12473

Yosuke Akimoto, Ping Wang, Yoshihiko Kurui, Naoya Fujiwara, Naoki Hiramatsu, Fumitaka Ishibashi, Yui Yamazaki, Ryota Kitagawa, Hiroaki Yamazaki, Akihiro Kojima

引用次数: 0

Development of Student Experiment on High-Frequency Circuits Using High Precision Simulation

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-01-28 DOI: 10.1002/ecj.12471

Shinpei Oshima, Rion Amano, Tessai Hayama

引用次数: 0

Development of a Hint Suggestion System Based on Student's Learning Status in Server Management Exercises

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-01-09 DOI: 10.1002/ecj.12476

Ichitoshi Takehara, Yuki Kami, Koji Kida, Keizo Saisho

{"title":"Development of a Hint Suggestion System Based on Student's Learning Status in Server Management Exercises","authors":"Ichitoshi Takehara, Yuki Kami, Koji Kida, Keizo Saisho","doi":"10.1002/ecj.12476","DOIUrl":"https://doi.org/10.1002/ecj.12476","url":null,"abstract":"<div>\u0000 \u0000 <p>In recent years, more and more server administration exercises have been conducted at universities. Some students get stuck on the answer to a task. In this case, the student requests a hint for the task. The teacher hears the student, assesses the progress, and offers a hint. Also, teachers want students to conduct trial and error on a task before asking for hints. Many students ask for hints during exercises, which is a burden for teachers. We develop a system that presents hints based on the student's learning status. The teacher registers the learning status and corresponding hints in the system in advance. The student's command input/output and edited files are monitored by the system to check the student's progress. The system can suggest many hints based on learning status. As a result of the evaluation experiment, unnecessary hints were not presented to the students. Also, the system can guide students to conduct trial and error in the learning situation the teacher expects. In this paper, we describe the developed system and the results of evaluation experiments using the system.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571383","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

Analysis of Sheet Thickness and Gate Voltage Dependence of Electrical Characteristics for Nanosheet MOSFETs

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-01-07 DOI: 10.1002/ecj.12480

Kosei Hosoda, Akira Hiroki

引用次数: 0

Boarding Support of Public Bus for the Visually Impaired Using Location Services

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-01-06 DOI: 10.1002/ecj.12475

Gakuto Doi, Masaharu Miyazawa, Tsuyoshi Moriyama

{"title":"Boarding Support of Public Bus for the Visually Impaired Using Location Services","authors":"Gakuto Doi, Masaharu Miyazawa, Tsuyoshi Moriyama","doi":"10.1002/ecj.12475","DOIUrl":"https://doi.org/10.1002/ecj.12475","url":null,"abstract":"<div>\u0000 \u0000 <p>We propose a system targeting visually impaired individuals that provides a couple of functions that help when they claim they are always in trouble when going out using public transportation. One of the functions alerts users when the bus that they are planning to ride gets closer to the bus stop where they are waiting for the bus. It runs as a multi-thread system. One of the threads periodically obtains the location of the bus driver utilizing a GPS receiver and uploads it to a specific shared location on the web. The other thread fetches the stored shared location from the web and calculates the distance to the location of the bus stop where the user is waiting for the bus. The latter thread alerts the user when the distance gets lower than a threshold. The other function we propose alerts users when their intended bus stop is approaching within a certain distance during bus rides. The system utilizes the GPS functionality embedded in smartphones to acquire the user's latitude and longitude. By comparing this information with the coordinates preregistered in the system for each bus stop, it detects when the user reaches within a certain distance of the destination bus stop. The implementation of the proposed system demonstrated the intended functionality in an experiment.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571299","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 Simple Diagnostic Method for Citrus Greening Disease With Deep Learning

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-01-06 DOI: 10.1002/ecj.12472

Ruihao Dong, Aya Shiraiwa, Takefumi Hayashi

{"title":"A Simple Diagnostic Method for Citrus Greening Disease With Deep Learning","authors":"Ruihao Dong, Aya Shiraiwa, Takefumi Hayashi","doi":"10.1002/ecj.12472","DOIUrl":"https://doi.org/10.1002/ecj.12472","url":null,"abstract":"<div>\u0000 \u0000 <p>Citrus greening disease (CG) is the most destructive disease of citrus, leading to branch dieback and plant death. Currently, there is no cure for CG, the early detection and removal of infected trees is important to prevent the spread of the disease. In recent years, there have been growing expectations for CG detection with digital images, especially deep learning techniques applied to digitized herbarium specimen image data. However, this approach faces challenges in practical applicability and detection efficiency. In this paper, we proposed a simple diagnostic method for CG using transfer learning with the Faster RCNN architecture. We collected in-field images from a citrus orchard in Thailand where CG has caused significant damage. We compared the performance of two annotation methods with the in-field leaf dataset and discussed their effects on pre-trained VGG and Resnet models. Five-fold cross-validation was utilized for model training and evaluation, with average precision (AP) used as the performance metric. The results showed that the Resnet models performed better than the VGG models, with the Resnet152 model scoring the highest in this task. The annotation method which included annotations of healthy and other disease leaves achieved an AP of 84.13% lower than another one but indicated better performance in practical applications with more robustness. Additionally, we developed a web application that performs real-time diagnosis using our trained models and verified the effectiveness of our system.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571279","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

Calculated Waveform and Peculiarity of Radiated Electric Field due to Collision ESD Between Metallic Spheres With Charging Voltages Below 1000 V Using Spark Resistance Law

IF 0.5 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-01-06 DOI: 10.1002/ecj.12474

Osamu Fujiwara, Ken Kawamata

{"title":"Calculated Waveform and Peculiarity of Radiated Electric Field due to Collision ESD Between Metallic Spheres With Charging Voltages Below 1000 V Using Spark Resistance Law","authors":"Osamu Fujiwara, Ken Kawamata","doi":"10.1002/ecj.12474","DOIUrl":"https://doi.org/10.1002/ecj.12474","url":null,"abstract":"<div>\u0000 \u0000 <p>Collision ESD between charged metallic objects below 1000 V causes electromagnetic interference in electronic equipment and devices. This interference is being observed to intensify at lower charging voltages. The phenomenon was first identified by Masmitsu Honda, but its underlying mechanism remains unclear even today. Originally, the charging voltage and spark length of collision ESD are unknown due to measurement difficulties, making it extremely challenging to establish the relationship between the radiated electric field strength and the spark property in such cases. In this study, to clarify the above mentioned electromagnetic phenomenon in collision ESD, a method of calculating the radiated electric field along with a spark length estimated from the measurement strength of radiated field peak is presented using the spark resistance law developed by Rompe and Weizel. The validity is confirmed by our previous measurement data on radiated electric field due to the collision ESD between charged spherical electrodes with a diameter of 30 mm at charging voltages from 300 to 600 V, employing an optical field probe with a wideband up to 10 GHz. The estimated spark length is verified by comparing it with the spark lengths based on an empirical Paschen's formula between fixed electrodes and the discharge data from past literature on metal electrodes, revealing the peculiarity effect of the radiated electric field strength caused by “constant breakdown potential gradient” that occurs at charging voltages below 1000 V.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571278","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