著者

水野 統太 芳賀 瑞穂 水戸 和幸 板倉 直明

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.137, no.4, pp.639-644, 2017-04-01 (Released:2017-04-01)

参考文献数

18

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A diet is possible by various methods now. Recently, the system which enables a partial thin figure by using ultrasonic wave and laser is developed. However, these methods are at risk of a burn or the internal hemorrhage. Therefore, the establishment of the safe method not to destroy a fat tissue is expected. In this study, warm and cold stimulus and vibration stimulus were given in the thigh posterior surface, we examined subcutaneous fat changes over time. We aimed at the establishment of the possible method of the simple and safe diet and fat movement using these external stimulus.

著者

松盛 裕明

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.140, no.8, pp.NL8_5, 2020-08-01 (Released:2020-08-01)

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This paper describes the introduction and research topics of Kosaka and Matsumori Laboratory in Nagoya Institute of Technology.

著者

丹保 憲仁

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.116, no.3, pp.167-170, 1996-02-20 (Released:2008-04-17)

著者

松前 重義 吉田 正 篠原 登

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.52, no.532, pp.859-867, 1932-11-10 (Released:2008-11-20)

参考文献数

3

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長距離電話回線としては從來装荷ケーブルのみが用ひられて來たが,之に代るに無装荷ケーブルを用びる時は傳播時間及過渡現象に對し極めて良好なる回線を作成し得べき事を述べ,且實際の回線に就き實驗したる結果を報告したものである。

著者

大須賀 公一

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.118, no.1, pp.9-12, 1997-12-20 (Released:2008-04-17)

参考文献数

16

著者

新中 新二 齋藤 洋治

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.126, no.11, pp.1467-1478, 2006 (Released:2007-02-01)

参考文献数

31

被引用文献数

4 4

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This paper proposes new sensorless vector control methods for permanent-magnet synchronous motors (PMSMs), which are based on a new minimum-order back-EMF state-observer taking acceleration into account, and examines potentiality of the improved back-EMF observer through experiments. Conventional sensorless vector control methods for PMSMs using an estimate of back-EMF are established under the assumption of constant speed or zero acceleration, consequently cannot operate properly at modes requiring rapid speed change especially in low speed region. On the other hand, the proposed back-EMF observer has the following features: 1) it is a new back-EMF state-observer taking acceleration into account and requiring no additional approximation to motor mathematical model; 2) it is a minimum order state-observer; 3) it utilizes motor parameters in the simplest manner; 4) it can be applied to both of salient-pole and non-salient-pole PMSMs; 5) it can be realized in both rotor and stator reference frames. Detailed designs and analyses for the improved state-observer and the sensorless vector control systems in both rotor and stator reference frames are given. In relation to the sensorless vector control systems, this paper newly proposes a double-integral type PLL method and an integral-feedback type acceleration/speed estimation method. Their potentialities are examined through experiments.

著者

丹羽 保次郎

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.42, no.402, pp.55-68, 1922 (Released:2008-11-20)

著者

井上 彬 高橋 理音 村田 年昭 田村 淳二 木村 守 二見 基生 井出 一正

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.125, no.10, pp.946-954, 2005 (Released:2006-01-01)

参考文献数

15

被引用文献数

2 8

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The spread of wind energy converter is progressing in recent years and its capacity is becoming larger and larger. In order to capture more energy from the wind, it is important to analyze loss characteristics of wind generators for operating speed which is determined dependent on the wind speed. This paper presents a method to evaluate various losses in wind generator as a function of wind speed, which is based on the steady state analysis and thus the calculation can be performed quickly. By using the proposed method, wind turbine power, generator output, various losses, and the total energy efficiency are calculated for three types of wind speed data which are represented by a weibull function.

著者

菊池 秀之

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.52, no.524, pp.243-252, 1932-03-10 (Released:2008-11-20)

参考文献数

4

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1箇の圓〓をZ軸にとり平面電波Ezが到來したときの電磁波電場の強度IzをMaxwell基本式より直接求めるとIz=1/2{1+W02+2 W0cos[2πr/λ cos ψ-(θ1-θ2+θ3)]}=1/2{1+W02+2 W0q}(r, ψ)は極座標,λは到來電波長W0:圓〓の物質,牛徑及長さによつて定まる再輻射係數θ1:圓〓の物質,半徑によつて定まる再輻射角θ2:2πr/λ- π/4θ3:圓〓の物質,長さによつて定まる再輻射角電場強度最大點の軌跡はq=1とおいた場合で圓〓を焦點とする抛物線群となる。2πr/λ (1-cos ψ)=(2n+1+ 1/4)π n=0,1,2,…之を「第1種干渉波頭抛物線群」と云ひ圓〓は到來電波に對して「眞の共振」にあると云ふ。2πr/λ (1-cos ψ)=(2n+1)π n=0,1,2,… 之を「第2種干渉波頭抛物線群」と云ひ圓〓は到來電波に對して「見掛の共振」にあると云ふ。2箇以上の圓〓を進來電波電場においた場合は各圓〓の呈する干渉波頭抛物線群は重疊する。この干渉波頭抛物線群を測定する事によつて,任意の物質,半徑及長さを有する圓〓固有の再輻射係數と再輻射角を定める事が出來る。又相等しい2箇の圓〓を到來電波に直角の方向におくと各圓〓の呈する干渉波頭抛物線の交點があり,その點では電場強度が倍加されてゐる。この點の位置と強度とを測定する事により單圓〓の再輻射係數と再輻射角を定める事が出來る。

著者

佐々木 拓二 永淵 澄夫

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.96, no.5, pp.391-393, 1976-05-20 (Released:2008-04-17)

参考文献数

4

著者

大山 敬

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.122, no.12, pp.842-845, 2002-12-01 (Released:2008-04-17)

参考文献数

5

著者

徐 嘉楽 野々村 美宗 峯田 貴

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌E(センサ・マイクロマシン部門誌) (ISSN:13418939)

巻号頁・発行日

vol.139, no.12, pp.393-399, 2019-12-01 (Released:2019-12-01)

参考文献数

20

被引用文献数

2

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In this paper, we fabricated periodic Si micro-bump structure, and sensory evaluation of tactile feeling of roughness and frictional resistance with human finger was conducted with paired comparison method. In addition, friction coefficient between the micro-bump array and an artificial urethane finger model that mimics human fingertip was evaluated. The samples had various bump sizes with width of 20∼600 µm and space of 20 µm. The space between the bumps (20 µm) was decided so that finger skin cannot enter the grooves. The result of sensory evaluation showed that rough feeling was increased with decreasing the micro bump size from 600 µm to 50 µm due to the edge effects of micro bump. The friction resistance feeling was influenced by contact area between the skin and bump surface. In addition, the friction resistance feeling was strong when the micro bump size was 50 µm. Also, the stick-slip phenomenon was strongly observed in the frictional measurement using artificial finger model.

著者

平岩 星哉 小中 英嗣

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.139, no.12, pp.1415-1419, 2019-12-01 (Released:2019-12-01)

参考文献数

11

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This paper discusses spot allocation in the national high school rugby tournament based on a quantitative strength evaluation method. In the national high school rugby tournament in Japan, each prefecture receives one spot except Hokkaido, which has two spots; Tokyo, which also has two; and Osaka, which has three. In this paper, Kanagawa and Fukuoka prefectures, whose representative teams achieved outstanding results in recent nationwide tournaments, are considered good candidates for extra spots in the tournament. This paper proposes an Elo-based quantitative skill evaluation method using about 1,800 match results. The evaluation results show high accuracy (84%) in match result prediction. In addition, the gaps between the winners and the finalists in Kanagawa and Fukuoka prefectures can be estimated. According to the results, the second team in Kanagawa ranked in the top 10 in the nationwide tournament; therefore, Kanagawa should receive an extra spot in it.

著者

原田 信弘 佐々木 徹 藤野 貴康

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.135, no.8, pp.NL8_5, 2015-08-01 (Released:2015-08-01)

著者

根岸 信太郎 池上 貴志

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.139, no.12, pp.757-766, 2019-12-01 (Released:2019-12-01)

参考文献数

20

被引用文献数

6

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In this paper, a new method of water pumping scheduling in a water distribution system with providing balancing reserves to power systems is proposed. This method enables to obtain a daily schedule of pumping water and balancing reserves, which is based on prices of electric energy and balancing reserves, hourly water demand profile, and properties between water flow quantity and consumption electricity of water pumps. The proposed method consists of an optimization model which is formulated by Mixed Integer Linear Programming (MILP). The constraints about the fluctuation of the volume of water in a reservoir, which is occurred by providing the balancing reserves, is added into the proposed model. Adding these constraints, stable water distribution is enabled even when the balancing reserves are activated. To verify the validity of the proposed method, simulations of water pumping scheduling in some cases were done. As a result, net operational cost was decreased when water pumps provided the balancing reserves. Moreover, the operational feasibility of providing the balancing reserve from water pumps is clarified.

著者

井田 憲一 菅 良平 玄 光男

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.124, no.9, pp.1861-1867, 2004 (Released:2004-12-01)

参考文献数

9

被引用文献数

1 1

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The greedy algorithm is one of solution methods for knapsack problem. Although this algorithm does not necessarily obtain the optimal solution, it can obtain a good solution in short time. We consider this algorithm is very effective at judging the importance of each item.In this paper, we propose a new genetic algorithm for solving a knapsack problem. The algorithm can adjust a search area in consideration of the stability of each item which can obtain from the greedy algorithm. Moreover, we apply the proposed method to a multi-objective problem and a large-scale problem, and test the effectiveness.

著者

星野 俊弘 石津 美帆子 大塚 健司 加藤 修士 坂田 清悟 中島 勉

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.116, no.9, pp.607-610, 1996-08-20 (Released:2008-04-17)

著者

萩原 善泰 藤田 武

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.123, no.7, pp.406-409, 2003-07-01 (Released:2008-04-17)

参考文献数

5

被引用文献数

2 2

著者

赤尾 武彦

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.98, no.2, pp.105-112, 1978-02-20 (Released:2008-04-17)

参考文献数

1

著者

村井 宗信

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.10, pp.686-689, 2001-10-01 (Released:2008-04-17)

参考文献数

1