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Development of capacitive seating analysis sensor using conductive textile for the evaluation of seating motion 使用导电织物开发用于评估座椅运动的电容式座椅分析传感器
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-08-21 DOI: 10.1002/ecj.12412
Hirofumi Kurosaki, Hiromu Shirahata, Junya Kawahara, Yasuhito Kondo, Ken Kondo, Bumsuk Lee, Masato Odagaki
{"title":"Development of capacitive seating analysis sensor using conductive textile for the evaluation of seating motion","authors":"Hirofumi Kurosaki,&nbsp;Hiromu Shirahata,&nbsp;Junya Kawahara,&nbsp;Yasuhito Kondo,&nbsp;Ken Kondo,&nbsp;Bumsuk Lee,&nbsp;Masato Odagaki","doi":"10.1002/ecj.12412","DOIUrl":"https://doi.org/10.1002/ecj.12412","url":null,"abstract":"<p>In this study, we developed a capacitive seating analysis sensor using a conductive textile for evaluating a Seating Motion. Physical burden on caregivers is a common problem at nursing care sites. Developing long-term caregiving skills can help reduce the physical burden on amateur caregivers. Several quantitative evaluation studies have focused on the skills of caregivers. However, such evaluation is highly expensive and require huge area because it involves the use of motion capture systems with several 3D cameras for dynamic motion analysis. In our previous study, we developed a conductive textile sensor for measuring the seating position of a care recipient in a wheelchair. The sensor could measure either seating body pressure or distance between the buttocks and the seat. The system can measure the care recipient's motion without requiring any motion capture system. We recommend using the sensor to evaluate the skills of caregivers; the sensor output can be used to determine the seating speed of the care recipient on the chair. Herein, we report the validity of the measurement system comprising a conductive textile–based capacitive seating analysis sensor for evaluating seating in nursing care.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50139493","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 hierarchical neural network model for Japanese toward detecting mild cognitive impairment 日语轻度认知障碍检测的层次神经网络模型
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-08-21 DOI: 10.1002/ecj.12410
Tetsuji Goto
{"title":"A hierarchical neural network model for Japanese toward detecting mild cognitive impairment","authors":"Tetsuji Goto","doi":"10.1002/ecj.12410","DOIUrl":"https://doi.org/10.1002/ecj.12410","url":null,"abstract":"<p>We found that some signs of mild cognitive impairment (MCI) might be presented in a structure of a sentence and a relation between sentences talked by a man, and develop a neural network model which has an analogy with the hierarchical structure of speakers, topics, sentences and words in Japanese. We build our model based on 2-layered bi-directional LSTM, corresponding to words-sentences and sentences-topics hierarchy. As a layer corresponding to speakers, we use a linear classifier with self-attention. The test result shows a largely improved AUC, compared with another test by using the normal 2-layered bi-directional LSTM with TBPTT. The result also indicates that there are some characteristic patterns in a talk by an elderly person with MCI. We classify the character vectors of topics generated from our model through learning into clusters whose number is 1/10 of the number of persons in our data. Since these clusters have almost less than 10% or more than 90% rate of positive share, we conclude that we can develop a screening method based on a talk in Japanese by an elderly person in the near future.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50139498","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
Detection of acoustic emission during fermentation using an electret sensor 利用驻极体传感器检测发酵过程中的声发射
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-08-19 DOI: 10.1002/ecj.12411
Kensuke Kageyama, Yuma Kawarai
{"title":"Detection of acoustic emission during fermentation using an electret sensor","authors":"Kensuke Kageyama,&nbsp;Yuma Kawarai","doi":"10.1002/ecj.12411","DOIUrl":"https://doi.org/10.1002/ecj.12411","url":null,"abstract":"<p>In this study, we focused on acoustic emission (AE) as a method for quantitative evaluation of fermentation. Since bubbling in the culture medium and detachment of the medium during fermentation are considered to be phenomena similar to corrosion, AE could be expected to be detected. Therefore, we conducted AE measurements using ECS during fermentation of yeast in sucrose solution, fermentation of yeast during sake brewing, and fermentation of sawdust in a hot bath facility, and investigated the possibility of evaluation of fermentation process using electret sensor (ECS). AE was detected during the fermentation of yeast. The peak frequency of AE detected during yeast fermentation was widely distributed. Cumulative number of AE, however, showed a strong correlation with the decrease in sugar content during fermentation, indicating the possibility of quantitative evaluation of the fermentation state by AE measurement if a time lag is considered. In the measurement of AE from the fermentation of sake malt, a large amount of AE was detected from the lower part of the tank immediately after brewing, and the number of AE gradually increased in the upper part of the tank. These AE measurements suggested that even in top fermentation, the initial fermentation may occur in the lower part of the tank. In the fermentation and warm bath facility, AE during fermentation could be detected even in powdered media. Although the durability of the ECS needs to be improved under high temperature and high humidity conditions, it is expected to be able to monitor the fermentation process better than temperature measurements.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50152260","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
Characterization of the VO2 thin films grown on glass substrates by MOD 玻璃基片上生长的VO2薄膜的MOD表征
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-08-16 DOI: 10.1002/ecj.12403
Hideo Wada, Taito Fukawa, Kazuaki Toyota, Masatoshi Koyama, Nobuya Hiroshiba, Kazuto Koike
{"title":"Characterization of the VO2 thin films grown on glass substrates by MOD","authors":"Hideo Wada,&nbsp;Taito Fukawa,&nbsp;Kazuaki Toyota,&nbsp;Masatoshi Koyama,&nbsp;Nobuya Hiroshiba,&nbsp;Kazuto Koike","doi":"10.1002/ecj.12403","DOIUrl":"https://doi.org/10.1002/ecj.12403","url":null,"abstract":"<p>This paper describes the deposition of Nb doped vanadium dioxide (VO<sub>2</sub>) films on a glass substrate by metal organic decomposition (MOD) and their thermochromic properties. The difference in thermochromic properties of VO<sub>2</sub> thin films on a glass substrate was investigated with and without a buffer layer of Hf0.5Zr0.5O2 (HZO). The phase transition temperature of VO<sub>2</sub> thin film successfully reduced from 83°C to 43°C on a glass substrate with a buffer layer of HZO. Without a buffer layer of HZO, the thermochromic properties of VO<sub>2</sub> thin films deteriorated comparing with a buffer layer of HZO. HZO buffer layer effectively suppresses the miniaturization of VO<sub>2</sub> crystallite size of thin film due to Nb doping. Moreover, it would block out the diffusion of Al, Na, and Ca impurity ions from a glass substrate and the partial oxidation of VO<sub>2</sub> thin films judging from XPS O1s spectra and XPS depth profile analysis. We conclude that the insertion of the HZO buffer layer is a useful technique for controlling the transition temperature of VO<sub>2</sub> for the smart window applications by MOD.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50134459","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
Realization of a database-driven PID control system using a CMAC memory 用CMAC存储器实现数据库驱动的PID控制系统
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-08-15 DOI: 10.1002/ecj.12406
Zhifeng Li, Zhe Guan, Toru Yamamoto, Sigeru Omatu
{"title":"Realization of a database-driven PID control system using a CMAC memory","authors":"Zhifeng Li,&nbsp;Zhe Guan,&nbsp;Toru Yamamoto,&nbsp;Sigeru Omatu","doi":"10.1002/ecj.12406","DOIUrl":"https://doi.org/10.1002/ecj.12406","url":null,"abstract":"<p>As a nonlinear control approach, a database-driven PID (DD-PID) controller has been proposed that uses distance calculations of an initial database to tune PID parameters. However, sorting operations are required in extracting neighborhood data from the database, which imposes a large computational load. Therefore, it is impossible to finish this computation within a restricted sampling period in control systems with fast response time and insufficient memory capacity. On the other hand, the cerebellar model articulation controller (CMAC) has advantages for these problems and has similar constructs to the DD approach. Therefore, this paper combines advantages of these two approaches, and proposes a CMAC-PID controller design based on off-line optimization of a database. Finally, a comparison with conventional off-line CMAC-PID controller and DD-PID controller through simulations are considered.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50133555","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
Sign-indefinite linear quadratic differential game for stochastic systems via static output feedback strategy 基于静态输出反馈策略的随机系统符号不定线性二次微分对策
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-06-16 DOI: 10.1002/ecj.12401
Muneomi Sagara, Hiroaki Mukaidani
{"title":"Sign-indefinite linear quadratic differential game for stochastic systems via static output feedback strategy","authors":"Muneomi Sagara,&nbsp;Hiroaki Mukaidani","doi":"10.1002/ecj.12401","DOIUrl":"https://doi.org/10.1002/ecj.12401","url":null,"abstract":"<p>Sign-indefinite linear quadratic differential game for stochastic systems by means of static output feedback (SOF) strategy is investigated. First, the saddle point equilibrium condition of external disturbance and control strategy is established based on stochastic cross-coupled algebraic matrix equations (SCCAMEs). Second, the numerical algorithms for solving the SCCAMEs are discussed. In particular, the difference between the existing algorithm and the proposed one is addressed. In order to show the validity for the several algorithms, a modified practical numerical example is demonstrated. In particular, it is shown that the optimality for the cost functional cannot be attained via the existing algorithm. Furthermore, it is claimed that the new proposed algorithm by combining the numerical algorithm that consist of stochastic Ricatti and Lyapunov equations with the Newton method is useful and reliable because the setting of the initial condition is quite easy task and fast convergence is attained.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 3","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50134849","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
Optimal segmentation of Halbach sphere Halbach球面的最优分割
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-05-29 DOI: 10.1002/ecj.12399
Kazuhiro Nishimura
{"title":"Optimal segmentation of Halbach sphere","authors":"Kazuhiro Nishimura","doi":"10.1002/ecj.12399","DOIUrl":"https://doi.org/10.1002/ecj.12399","url":null,"abstract":"<p>The direction of magnetization in which the magnetic field becomes the strongest in the x-axis direction in the spherical coordinate system is used. Its magnetic field depends on the <i>φ</i> direction in the spherical coordinate system, that is, strongest at the top (<i>φ</i> = 0) and the bottom (<i>φ</i> = <i>π</i>), and the side (<i>φ</i> = <i>π</i>⁄2) becomes the weakest. Therefore, when segmenting, it was divided to include the top and the bottom parts. In addition, in order to make it an optimal segmentation, it is effective to make the range of the top and bottom divisions wide, the sides narrow, and the direction of magnetization close to the top and the bottom directions. By optimizing in this way, the magnetic field is larger than the equal division. For example, it was about 1.09 times stronger in three divisions. This was confirmed by the experiment. However, there is a problem that the demagnetic field in the center becomes strong by optimizing. The type of division which is strong in this problem is also introduced.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 2","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50124982","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
3D motion analysis of kick start motion−Effects of upper limb movements on the body when leaving the platform− 踢腿启动运动的3D运动分析−离开平台时上肢运动对身体的影响−
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-05-27 DOI: 10.1002/ecj.12400
Hiroki Hyodo, Tadashi Wada
{"title":"3D motion analysis of kick start motion−Effects of upper limb movements on the body when leaving the platform−","authors":"Hiroki Hyodo,&nbsp;Tadashi Wada","doi":"10.1002/ecj.12400","DOIUrl":"https://doi.org/10.1002/ecj.12400","url":null,"abstract":"<p>The purpose of this study was to clarify the effect of the presence or absence of upper limb movement on the propulsion direction body velocity (TPV) leaving the platform at kick start. The first trial (Standard trial) is a normal kick start, and the second trial (Lower trial) is the same as a normal kick start. The force from the upper limb movement at the time was set so that the start table was not applied, and the start movement calculated the 3D coordinates of the marker attached to the body by 3D movement analysis. As a result, in the movement speed at the time of leaving the platform, the standard trial had a significantly higher value in the propulsion direction and a significantly lower value in the vertical movement speed than the lower trial. In addition, since the standard trial had a significantly lower value in the jumping angle when leaving the platform, the role of the upper limb movement in kick start is to promote by making the jumping angle closer to the horizontal when leaving the platform. It was suggested that it may affect the directional velocity.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 2","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50155032","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 feedback system by customized UI to improve UX of web page 通过定制用户界面开发反馈系统以提高网页用户体验
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-04-06 DOI: 10.1002/ecj.12392
Tatsuhiro Motobu, Koji Kida
{"title":"Development of feedback system by customized UI to improve UX of web page","authors":"Tatsuhiro Motobu,&nbsp;Koji Kida","doi":"10.1002/ecj.12392","DOIUrl":"https://doi.org/10.1002/ecj.12392","url":null,"abstract":"<p>In recent years, the number of websites has been increasing, and with it, the number of similar services. As a result, UX is becoming more and more important to measure the differentiation of a website from its competitors, and UI plays a major role in improving UX. Website developers implement a development process called HCD to improve UI. However, in HCD, there is a gap between the perception of the evaluator and the developer, resulting in a lot of man-hours. In this paper, we propose a method for evaluating web pages using GUI operations to solve this problem. We let the evaluator of the web page edit the web page by mouse operation from the browser, and feedback the result directly to the developer. As a result of the experiment, we were able to discover problems with the web pages that could not be obtained by the conventional questionnaire. It also made it easier to design improvement plans, leading to a reduction in man-hours.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 2","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50132858","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
Electrical conductivity measurement using a microfluidic chip and evaluation of vsiscosity by Walden's rule 用微流控芯片测量电导率并用Walden规则评价粘度
IF 0.3 4区 工程技术
Electronics and Communications in Japan Pub Date : 2023-03-03 DOI: 10.1002/ecj.12387
Kenji Sakamoto, Yuriko Hachiya, Koichiro Kobayashi
{"title":"Electrical conductivity measurement using a microfluidic chip and evaluation of vsiscosity by Walden's rule","authors":"Kenji Sakamoto,&nbsp;Yuriko Hachiya,&nbsp;Koichiro Kobayashi","doi":"10.1002/ecj.12387","DOIUrl":"https://doi.org/10.1002/ecj.12387","url":null,"abstract":"<p>In this study, the electrical conductivity of low-volume samples was measured using a prototype microfluidic chip with electrodes. We were able to show the difference of electrical conductivity in the samples of saline solution (0.9w/v% NaCl solution) with sucrose. The correlation between the electrical conductivity and the viscosity evaluated by the capillary method was shown. This correlation was shown that it is possible to evaluate viscosity based on the Walden's rule with our chip.</p>","PeriodicalId":50539,"journal":{"name":"Electronics and Communications in Japan","volume":"106 2","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50119295","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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