著者

高木 亮

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.121, no.8, pp.539-542, 2001-08-01 (Released:2008-04-17)

参考文献数

7

著者

石飛 学

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.139, no.10, pp.701, 2019

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<p>どしゃぶりの雨があがった2019年6月22日土曜日。大阪市立科学館にやって来た子供たちの前に現れたのは,頭上の小さなスペースにペットボトルを放り投げ,かっこよ</p>

著者

井堀 礼晶 金子 修 宅島 勉

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.141, no.3, pp.307-314, 2021-03-01 (Released:2021-03-01)

参考文献数

12

被引用文献数

1

---

Tracing control is used in various precision processing systems for industrial products. It is important for a tracing control system to be maintained so as to achieve the accuracy of positioning of the gap between the workpiece and the machining tool during the operation. For this requirement, the control gain is implemented as a look-up table corresponding to the gap. This controller is also used to attenuate the effect of an unevenness of the workpiece which is regarded as a measurable disturbance in the output of the tracing control system. In this paper, we present a data-driven update method of table-typed controller gain in tracing control system for disturbance attenuation.

著者

世古 隆哉

出版者

一般社団法人 電気学会

雑誌

電氣學會雜誌 (ISSN:00202878)

巻号頁・発行日

vol.106, no.11, pp.1057-1058, 1986-11-20 (Released:2008-04-17)

著者

西尾 章治郎

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.141, no.3, pp.127, 2021-03-01 (Released:2021-03-01)

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変革に向けての好機大阪大学で開催されることになっていた令和3年電気学会全国大会は,新型コロナウイルス感染症(COVID-19)拡大の影響によりオンライン開催(ライブ配信)となった。COVID-19が,学会活動のみならず,我が国の社会,経済,そして大学の使命である教育研究に及ぼして

著者

七原 俊也

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.124, no.1, pp.12-16, 2004-01-01 (Released:2008-04-17)

参考文献数

16

被引用文献数

8 4

著者

加納 善明 小坂 卓 松井 信行 中西 俊人

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.135, no.6, pp.725-733, 2015-06-01 (Released:2015-06-01)

参考文献数

26

被引用文献数

1

---

This paper presents a torque ripple reduction design of a concentrated-winding IPMSM with a new flux barrier for saliency-based sensorless drives. The proposed IPMSM is designed for use in general-purpose sensorless industrial drives. In order to reduce torque ripple, its rotor employs a V-shape-magnet arrangement and circular flux barrier which is placed at the center of a rotor yoke between N- and S-poles. A 45-Nm 5.5-kW IPMSM is manufactured as a prototype in order to confirm the design validity, and experimental studies using the prototype demonstrate the expected drive characteristics and validate the proposed design procedure.

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.3, pp.NL3_9, 2021-03-01 (Released:2021-03-01)

著者

鈴木 譽久 浅野 賢二 間宮 昇 渡部 浩志 堀 吉宏 内原 可治

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.118, no.6, pp.701-705, 1998

被引用文献数

1

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We have investigated a clock generated from a wobbled groove for higher density magneto-optical disk. Neither the readout signal nor the recording signal needs to include a clock element, because a clock derived from the wobbled groove is used for recording and readout. Therefore this clock does not depend on the quality of the readout signal. For this reason, a clock generated from the wobbled groove is effective for higher density recording.

著者

小薗 秀明 谷水 徹

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.128, no.12, pp.1423-1426, 2008-12-01 (Released:2008-12-01)

参考文献数

10

被引用文献数

1

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Vacuum Circuit Breakers (VCBs) have been widely used for medium voltage level, because of their performance: compact size, light weight, maintenance free operations and environment-friendly characteristics. They become most comfortable breakers for our needs from other breakers: oil, air, magnetic blast and gas. In this paper the history of vacuum, and latest trends of circuit breakers and related technologies are described, as well as merits or demerits of using vacuum technologies.

著者

道上 勉 鬼塚 長徳 北村 哲

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. B (ISSN:03854213)

巻号頁・発行日

vol.110, no.11, pp.887-894, 1990

被引用文献数

1

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The previous generator excitation control system is based on AVR control of generator terminal voltage. This system can't accommodate reactive power up to the facility limit even when the power system voltage decreases to the limit for stable operation. We attempted to develop advanced excitation control system (PSVR) to achieve higher constant sending end voltage of power station. We intended to apply the system to the generator connected to a 500kV system which contributes most effectively to the voltage stability of a bulk power transmission system. This PSVR produces higher control gains than the AVR, the following functions were adopted: (1) AVR gain reduction circuit, (2) phase compensation circuit, and (3) damping improvement by enlarging the limiter of the PSS. In addition, various functions were provided. These include voltage slope characteristics to balance the reactive power of adjacent generators and PSVR output and terminal voltage limiter to stabilize the generator operation. Previously to an application to a real system, a transient response test was performed by combining PSVR and generator simulator to verify the damping improvement and stability of the voltage control.

著者

藤澤 隆史 土屋 晋 高島 杏菜 原田 甫 長田 典子

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.127, no.4, pp.667-673, 2007-04-01 (Released:2007-07-01)

参考文献数

16

---

In this study, we evaluated observers' impressions on different styles of make-up applications. We showed the observers various styles of make-up for 3DCG characters, and they scored their impression of the made-up faces. In experiment 1, to identify the impression dimensions for the made-up faces, we had 38 undergraduate subjects evaluate 4 make-up styles using 23 adjectives. As a result, we extracted 2 factors, "external appearance" and "internal feeling" about the characters. In experiment 2, we had 70 undergraduate subjects evaluate 5 make-up styles using 7 adjectives. We applied the “positioning analysis" method for the SD data, and mapped the loading values for make-up styles (targets) and adjectives (scales) on a 2 dimensional plane. The results showed that the adjectives were different for each make-up styles, suggesting that the impression of CG characters can be controlled by make-up using texture synthesis.

著者

米谷 昭彦 渡邊 晃

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.125, no.11, pp.1737-1742, 2005 (Released:2006-02-01)

参考文献数

5

被引用文献数

3

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The full-digital audio amplifiers are advantageous with the points of its high power efficiency and its possibility of high fidelity due to the digital signal processing. With the full-digital amplifier, class-D amplifiers are used to drive the load with PWM signals produced from the source signal. Unfortunately, the signals are distorted when the PCM signals are converted to the PWM signals because the pulse-width modulation is a nonlinear conversion from the viewpoint of transient responses. This paper proposes a way to compensate the distortion caused by the pulse-width modulation. A feedforward compensation approach is used because of the simplicity of implementation. The distortion components are estimated with the source signals and its time-derivative signals and used to cancel out them by subtracting them from the source signals. A numerical example with two-tone test is performed to show the effectiveness of the proposed method. The distortion compensation scheme used here may be applicative to other applications.

著者

加藤 司 長山 格 玉城 史朗

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.2, pp.161-167, 2021

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<p>We developed a fishery and marine skill learning support system as a self-training teaching material. In this study, we evaluated the usefulness of the proposed system by using text mining and searched for the points to be improved in this system. Using this system, we conducted a survey among the students of a fisheries high school using an evaluation sheet with free-form answering. From the results, we extracted five points, namely "learning method using this system", "video operation and technology confirmation", "promotion of understanding by this system", "skill learning at home", and "fun to learn fisheries skills". Among these five points, "promotion of understanding by this system", in which an understanding of the skill is promoted through explanations of skill and skill videos, was evaluated positively. It was also found that a review is effective in utilizing this system. As a point to be improved, it was found that narration should be provided along with the presentation of the subtitles.</p>

著者

城間 康 安富祖 仁 斎藤 秀和 長山 格 玉城 史朗

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.2, pp.168-172, 2021

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<p>The grade of a mango is determined by its color. Traditionally, the classification of mangoes is manually performed by humans. Such classification is subjective and then the quality of mango's is not uniform. In order to overcome the problem, automatic classification method to classify mango based on RGB histogram of their images and certain threshold. However, this process might be influenced by variations in the luminance. In this study, we implemented alternatives of the traditional method and compared them with sampled images.</p>

著者

安里 健太郎 金城 知子 豊里 一貴 大城 尚紀 下地 将生 比嘉 靖

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.2, pp.113-123, 2021

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<p>This paper presents a novel seeds-needs cooperation method using an ICF model and a simplified embodiment model to develop nursing care robots. In the V-process of the nursing care robot development guidebook published by AMED, an ICF model is used to consider role of <i>robots</i> in providing <i>nursing care</i>. In addition, the simplified embodiment model contributes to the realization of <i>robots</i> to achieve better <i>nursing care</i> using the proposed method. In particular, the ICF model and the simplified embodiment model are useful to design and refine the development concept of a nursing care robot. The validity of the proposed method is confirmed by a development record of an all-in-one nursing care robot for transferring and moving support in the Okinawa nursing care robot consultation.</p>

著者

長山 格 上原 和加貴 城間 康 宮里 太也

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.2, pp.130-137, 2021

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<p>In this study, we aim to develop a robust motion recognition system for an intelligent video surveillance system, that can be used for security, sports and rehabilitation by using extended alternative learning. A robust motion recognition system is necessary for the automated detection of security incidents by using a machine learning approach. However, to avoid the difficulty of collecting a huge training dataset, we propose an alternative learning approach that trains a deep neural network with a 3D-CG dataset to recognize several motions. We present our experimental results on motion recognition from free-viewpoint videos by using deep learning and alternative learning. The trained deep neural network (DNN) is evaluated using actual videos by classifying the different actions performed by real humans in these videos.</p>

著者

加藤 司 長山 格 玉城 史朗

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.2, pp.124-129, 2021

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<p>In 2019, we proposed an industry-school education skill succession (I-SSS) process and used it to develop a fisheries and marine skill learning system. In this study, we evaluate the appeal of the teaching materials in this system by using the ARCS motivation model from the perspective of learning motivation and search for the components of this system that would motivate learning. We used a teaching material evaluation sheet based on the ARCS motivation model to conduct a survey of students at a fisheries high school after using this system. From the results, we obtained many positive answers with all ARCS model factors, which confirmed that our proposed system had a high degree of usefulness for students. In addition, the results of the factor analysis on the motivation factor for student's learning show that the following the components lead to increased motivation for learning: "Procedure confirmation image, Presentation of finished form", "Basic skills listed in textbooks", "Explanation of practicality of skills", "Explanation of the relevance of skills and work/Qualification", and "Adoption of terms in textbooks, Easy-to-understand expressions".</p>

著者

長山 格 岩永 竜也 上原 和加貴 宮里 太也

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.2, pp.138-146, 2021

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<p>This paper presents the development of a new method for the estimation and resolution of body occlusion using deep learning for an advanced intelligent video surveillance system. A generative adversarial network is used to estimate and reconstruct an image of a hidden part of the human body. Furthermore, an alternative learning approach using 3DCG that was developed in our previous study is adopted to create a large dataset for deep learning. Experimental results indicate that the proposed method performs well in the estimation of hidden parts of the human body using images of actual people.</p>

著者

水野 秀俊 近藤 潤次

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. D, 産業応用部門誌 (ISSN:09136339)

巻号頁・発行日

vol.136, no.5, pp.375-376, 2016

被引用文献数

1

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This letter proposes a self-excitation method for diversion of static-excitation synchronous generators such as automotive alternators. In the proposed method, a voltage doubling rectifier circuit is used to start a synchronous generator at practical rotational speed through the residual magnetism of its rotor. An experiment was performed assuming a diversion of an automotive alternator, and it was possible to configure the proposed method where only three components were added by sharing the internal components of the alternator. Finally, it was confirmed that the proposed method could generate the output voltage by the demonstration experiment at approximately 1400rpm.