Electronics and Communications in Japan最新文献

High Isolation by Small Dual-Polarized Antenna With Dual Vertical Split-Ring Resonators 采用双垂直分环谐振器的小型双极化天线实现高隔离

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-15 DOI: 10.1002/ecj.12504

Hiromichi Yoshikawa, Shinji Isoyama, Hiroshi Uchimura

引用次数: 0

Conducting Wave Analysis of Temporal Changes in Multi-Channel Surface EMG for Estimation of Mobilized Muscle Fibers 多通道表面肌电图时间变化的传导波分析用于估计运动肌纤维

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-11 DOI: 10.1002/ecj.12494

Tomohiro Kosuge, Aoi Yamada, Hiroshi Kumagai

{"title":"Conducting Wave Analysis of Temporal Changes in Multi-Channel Surface EMG for Estimation of Mobilized Muscle Fibers","authors":"Tomohiro Kosuge, Aoi Yamada, Hiroshi Kumagai","doi":"10.1002/ecj.12494","DOIUrl":"https://doi.org/10.1002/ecj.12494","url":null,"abstract":"<div>\u0000 \u0000 <p>Skeletal muscle is a collection of motor units (MUs) composed of motoneurons and muscle fibers; muscle contraction is regulated by the number and type of MUs. Since sarcopenia and disuse atrophy are caused by atrophy of specific muscle fiber types, it is important to observe mobilized MUs for skeletal muscle diagnosis. In a previous study, we proposed a method to measure multi-channel surface electromyography (EMG) and quantitatively acquire conducting waves, which are potential waveforms propagating on the muscle surface. The mode of MU mobilization by prolonged muscle contraction is not well known. It is necessary to be able to estimate the mobilized MU over time to diagnose slow muscle fibers and to realize the evaluation of muscle activity during training. This study analyzed the conducting waves of multi-channel surface EMG during prolonged muscle contraction in 20 adult male subjects. The results of the changes in the conducting wave during long-duration muscle contractions at high and low loads showed different characteristics, suggesting the possibility of using the propagating wave to elucidate skeletal muscle.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 3","pages":"3-10"},"PeriodicalIF":0.4,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145111213","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 Facile Quantitative Evaluation Method for Citrus Peel Aroma Using Electronic Nose 柑桔果皮香气快速定量评价方法的建立

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-11 DOI: 10.1002/ecj.12499

Yoshitomi Kudo, Hiroko Hamada, Keisuke Nonaka, Ayami Hisanaga, Kouki Fujioka

{"title":"Development of Facile Quantitative Evaluation Method for Citrus Peel Aroma Using Electronic Nose","authors":"Yoshitomi Kudo, Hiroko Hamada, Keisuke Nonaka, Ayami Hisanaga, Kouki Fujioka","doi":"10.1002/ecj.12499","DOIUrl":"https://doi.org/10.1002/ecj.12499","url":null,"abstract":"<div>\u0000 \u0000 <p>The citrus aroma, which affects the consumer's preference, is an important parameter for breeding. However, the quantitative evaluation of citrus aroma was difficult because the aroma accumulates in the oil glands of the peel. In this study, we improved the aroma evaluation method using a portable electronic nose and the odor-emitting device (OED) that we had invented previously. By standing after shaking the sample and OED, repeatability was improved, and it enabled the quantitative evaluation and comparison of aromas emitted from different citrus cultivars peel. Furthermore, nine parameters calculated from four sequential data were used for PCA and <i>k</i>-means clustering, and they show the classification of citrus aromas. As a result, Lisbon Lemon and Rinoka were clustered in Cluster 1; Encore, Yoshida Ponkan, and Sweet Orange were clustered in Cluster 2; and Ueno Wase and Miyagawa Wase were clustered in Cluster 3. Based on the result of clustering, decision tree analysis was conducted, and the factors contributing to the clustering of the aromas were shown. In this study, we have developed aroma evaluation methods consisting of e-nose, OED, and an algorithm optimized for aroma classification of citrus peels, and this result would contribute to accelerating breeding of valuable citrus cultivars.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 3","pages":"37-46"},"PeriodicalIF":0.4,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145111212","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

Parameter Determination Considering Individual Differences for Muscle Fatigue Time Estimation Model Based on Surface-ElectroMyoGram 考虑个体差异的肌表肌电疲劳时间估计模型参数确定

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-09 DOI: 10.1002/ecj.12502

Kosuke Nakashima, Daisuke Kushida

{"title":"Parameter Determination Considering Individual Differences for Muscle Fatigue Time Estimation Model Based on Surface-ElectroMyoGram","authors":"Kosuke Nakashima, Daisuke Kushida","doi":"10.1002/ecj.12502","DOIUrl":"https://doi.org/10.1002/ecj.12502","url":null,"abstract":"<div>\u0000 \u0000 <p>Muscle condition is evaluated primarily based on physical therapy; however, evaluation has not been quantitative. To quantify muscle fatigue, the authors previously derived and defined “muscle fatigue time,” which quantifies muscle fatigue using frequency analysis based on the surface-ElectroMyoGram of the biceps brachii. The authors also constructed a muscle fatigue time estimation model based on the relationship between muscle fatigue time and muscle load for each participant. However, since the values of the model parameters differ from subject to subject, generalization of the model requires deriving the relationship between subject characteristics and the parameters. In this study, we attempted to select physical features that influence method parameters and estimate those parameters from selected physical features using multiple regression analysis. Percent body fat and biceps skinfold thickness were selected as physical features, and parameters were determined that yielded data with an error rate of approximately 13%. These results suggest that the variation in model accuracy between individuals can be eliminated using physical features.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 3","pages":"60-67"},"PeriodicalIF":0.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110751","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 of Organic Strain Gauge on Curved Surface by Direct Patterned Microcontact Printing for Nail Sensing 直接图纹微接触印刷在指甲感应曲面上制作有机应变片

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-08 DOI: 10.1002/ecj.12500

Hiroshi Yamauchi, Takashi Tadokoro

引用次数: 0

Effects of Reducing Agents and Pre-Sintering Annealing on Phase Changes During the Sintering of W-Type Ferrites 还原剂和预烧结退火对w型铁氧体烧结相变的影响

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-08 DOI: 10.1002/ecj.12501

Gaku Obara, Takumi Takahashi, Takayuki Honda, Thomas Schulz, Jörg Töpfer

引用次数: 0

Development of Technology for Measuring Water Retention and Permeability of Concrete Using Quartz Complex Capacitance Sensor 石英复合电容传感器测量混凝土保水性和透水性技术的发展

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-04 DOI: 10.1002/ecj.12498

Mahiro Kirinashizawa, Keigo Iwamoto, Taketeru Yokoyama, Masayuki Sohgawa, Takashi Abe

引用次数: 0

Research on Stiffness Estimation Method Using Micro-Macro Bilateral Control 基于微宏观双边控制的刚度估计方法研究

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-02 DOI: 10.1002/ecj.12497

Kenta Murakumo, Naoki Motoi

{"title":"Research on Stiffness Estimation Method Using Micro-Macro Bilateral Control","authors":"Kenta Murakumo, Naoki Motoi","doi":"10.1002/ecj.12497","DOIUrl":"https://doi.org/10.1002/ecj.12497","url":null,"abstract":"<div>\u0000 \u0000 <p>In recent years, stiffness measurements of micro-order objects are required. For example, analysis of the mechanical properties of a new material, such as a soft crystal, has been attracting attention. In the conventional methods to measure the stiffness, the grasping object is held without force feedback. Therefore, there is a possibility of damaging the objects. To solve this problem, this paper proposes a stiffness measurement method based on micro-macro bilateral control for micro-order objects. The micro-macro bilateral system consists of the leader system that is easy for the operator to manipulate, and the follower system that is sized to operate in a small environment. For the precise measurement, grasping the object is achieved by the micro-macro bilateral control. In this grasping, the total stiffness, including the object and the follower system, is measured in real-time. The stiffness of the follower system is identified by the preliminary experiment. As a result, the stiffness of the object is estimated by subtracting the total stiffness from the identified stiffness of the follower system. The validity of the proposed method was confirmed by the experimental results.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 3","pages":"24-30"},"PeriodicalIF":0.4,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110809","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

Automatic Measurement of Sounds Produced by a Whistling Vocal Tract Model−Measurement of the Fundamental Frequency of the Generated Sounds and the Flow Range 自动测量口哨声道模型产生的声音−测量所产生声音的基频和流量范围

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-09-01 DOI: 10.1002/ecj.12495

Masahiro Okamoto, Mikio Mori

{"title":"Automatic Measurement of Sounds Produced by a Whistling Vocal Tract Model−Measurement of the Fundamental Frequency of the Generated Sounds and the Flow Range","authors":"Masahiro Okamoto, Mikio Mori","doi":"10.1002/ecj.12495","DOIUrl":"https://doi.org/10.1002/ecj.12495","url":null,"abstract":"<div>\u0000 \u0000 <p>Previous studies have aimed to elucidate the principles of whistling by constructing vocal tract models using computed tomography data of the vocal tract during whistling. In addition, studies have been conducted on whistling pitch change models, in which the plates of the vocal tract model are adjusted to simulate changes in the vocal tract shape due to pitch changes. However, these studies often required manual operation of measuring devices and the interpretation of gauges. In this study, we developed a device that automates the measurement of sounds emitted by a vocal tract model during whistling. Using this device, we estimated the duration during which a stable whistling sound was generated and examined a method to measure the fundamental frequency and flow rate when the sound quality was optimal. Consequently, the device can automatically adjust, measure the flow rate, and analyze the generated sound. Furthermore, by using the distortion rate, we could estimate the period during which a whistling sound was generated and determine the fundamental frequency at which the sound quality was optimal.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 3","pages":"11-18"},"PeriodicalIF":0.4,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110876","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

Investigation of Hollow or Stepped Structures for Lightweighting Prove Cover of Patch Type Core Body Thermometer 贴片式核心体温计轻量化验证盖中空或阶梯式结构的研究

IF 0.4 4区工程技术

Electronics and Communications in Japan Pub Date : 2025-08-29 DOI: 10.1002/ecj.12496

Soto Tada, Yuki Hashimoto, Yoshifumi Nishida

{"title":"Investigation of Hollow or Stepped Structures for Lightweighting Prove Cover of Patch Type Core Body Thermometer","authors":"Soto Tada, Yuki Hashimoto, Yoshifumi Nishida","doi":"10.1002/ecj.12496","DOIUrl":"https://doi.org/10.1002/ecj.12496","url":null,"abstract":"<div>\u0000 \u0000 <p>Core body temperature, which is the temperature inside the body, is a useful biological indicator for understanding changes in various physical activities due to its characteristics of being insensitive to external disturbances. However, the gold standard measurement methods require inserting probes in the body, which is highly invasive and unsuitable during activity. Conversely, a patch-type sensor that estimates core body temperature from heat flow changes near the skin surface has been attracting attention as a suitable method during activity. However, its practical challenge has been to improve robustness to environmental changes. Recently, we have solved this problem by improving the conventional measurement probe. Nevertheless, the weight reduction of the measurement probe has been an additional challenge. Here, we focused on the probe cover, which had previously been identified as a significant obstacle to weight reduction. We investigated the potential of applying a typical lightweight structure, such as a hollow or stepped structure, to the probe cover in order to achieve both weight reduction and high accuracy of the measurement probe.</p>\u0000 </div>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"108 3","pages":"19-23"},"PeriodicalIF":0.4,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145111276","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