著者

新中 新二

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.128, no.9, pp.1147-1148, 2008-09-01 (Released:2008-09-01)

参考文献数

7

被引用文献数

1 1

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This paper gives a new analysis about the minimum current under the flux saturation for efficient drive of synchronous reluctance motors. This paper shows that the asymmetric flux saturation of the mirror-phase inductance causes the nonlinear minimum current trajectory, and derives newly the general analytical trajectory and a concrete approximated analytical trajectory.

著者

本田 敦夫 手塚 孔一郎 岡村 智仁 河本 薫 清水 翔司 原田 耕平 田辺 隆人 白川 達也 高橋 智洋

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.138, no.11, pp.862-873, 2018-11-01 (Released:2018-11-01)

参考文献数

23

被引用文献数

1

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Osaka Gas Co., Ltd., jointly with NTT DATA Mathematical Systems Inc., has developed unit-commitment model for optimizing dispatch of power generation units. Main purpose of this development is to simulate the future world of electric power system in accordance with national energy policy aiming to introduce large amount of renewable energy as well as vitalized cross-border power exchange via PX market to enhance economically-efficient power system operation. The model incorporates not only constraints of supply-demand balance but also constraints of operating reserves, regulation reserves, maximum CO2-emissions, etc.

著者

加藤 利次 井上 馨 秋山 佑介 大橋 功基

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.9, pp.615-621, 2016-09-01 (Released:2016-09-01)

参考文献数

11

被引用文献数

4 2

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A grid-connected inverter is indispensable for photovoltaic power generation and smart grid systems, and it must be designed for stable operation. The impedance method based on the Nyquist criterion is often utilized to analyze the stability of grid-connected inverter systems. The impedance method is based on the eigen values of the product of the inverter output admittance and the line impedance matrices in the frequency domain. However, the frequency characteristics have so far been derived only for inverters with analog control systems. A new frequency analysis method for inverters with digital control systems is proposed in this paper. First, a stability analysis example for a three-phase LCL-type inverter controlled digitally is shown and the results are compared and validated with those by simulation using a Saber simulator. Finally, they are also compared and validated with experimental results digitally controlled by a DSP-based system.

著者

武田 廣

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.136, no.5, pp.265, 2016-05-01 (Released:2016-05-01)

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神戸大学長に就任する以前の私の専門は,素粒子実験物理学でした。別名「高エネルギー物理学」とも称せられます。科学技術の発展に伴い,素粒子 (あるいはその複合体) を非常に高いエネルギーに加速できるように

著者

舟木 剛 福永 崇平 井渕 貴章 福田 典子 中村 孝 柳澤 佑太

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.143, no.9, pp.636-643, 2023-09-01 (Released:2023-09-01)

参考文献数

21

被引用文献数

1

---

This study develops a transformer-less power supply for AC railway vehicles. The rail on the permanent route of an AC electric railway is grounded. The proposed power supply circuit takes advantage of this feature and performs AC-DC power conversion without using a bridge circuit. The circuit topology is a combination of indirect type DC-DC converters. The operation and control of power conversion from AC to DC power run and from DC to AC regeneration is confirmed using numerical simulations. In addition, the operation of the proposed circuit is validated experimentally.

著者

高山 和奈 伊藤 仁 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.143, no.9, pp.979-984, 2023-09-01 (Released:2023-09-01)

参考文献数

21

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Soft tennis originated in Japan, is selected as a club activity by many junior and high school students. Several senior elite-level competitions, e. g., nationwide amateur club championships, have been held regularly. These competitions, however, have no clear order of importance between them. Moreover, any ranking of players or pairs based on mathematical evidence has not been established. This paper proposes a novel ranking method for elite-level soft tennis players using match results. The proposed method is based on Colley's method, which can include the opponent and the margin of victory of every match in strength evaluation. The validity of the proposed method is verified based on its prediction performance.

著者

海老原 大樹 正田 英介

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.115, no.7, pp.420-423, 1995-06-20 (Released:2008-04-17)

参考文献数

10

被引用文献数

1 1

著者

吉川 祐一 村上 浩 森本 茂雄

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.2, pp.126-133, 2016-02-01 (Released:2016-02-01)

参考文献数

12

被引用文献数

2 1

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This paper proposes a new structural dual rotor SPMSM (Surface Permanent Magnet Synchronous Motor) using ferrite magnets having high torque density, small size, and low noise. In addition, the advantages of having a toroidally winding and adual rotor are examined through analysis, and it is confirmed that the torque density of the proposed motor is competitive to the rare-earth IPMSM (Interior Permanent Magnet Synchronous Motor).

著者

稲数 幸祐 小布施 大志 岡田 桂祐 石川 綾乃 許 倩南 染谷 竜太

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.136, no.7, pp.438-441, 2016-07-01 (Released:2016-07-01)

参考文献数

2

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1.はじめに アミューズメントマシン(Amusement Machine:AMM)は,利用者が機械を利用し,機械から反応を得て楽しむための機械である。 AMMは「人の手によらず動くもの」を面白い,珍しい,不思議と思い,受け入れることから生まれたと考えら

著者

原田 久 小山 正徳

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.71, no.748, pp.73-81, 1951 (Released:2008-11-20)

参考文献数

4

著者

中澤 和司 近藤 和弘

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.143, no.8, pp.830-841, 2023-08-01 (Released:2023-08-01)

参考文献数

41

被引用文献数

2

---

In this paper, we made improvements and evaluated our proposed model for non-reference speech intelligibility estimation on reverberant speech, attempting to improve the estimation accuracy significantly. Our proposed method consists of a DNN for speech enhancement and a separate DNN for intelligibility estimation. The latter uses features obtained from enhanced and degraded speech to estimate intelligibility. Although previous studies have effectively estimated intelligibility for speech degraded by additive noise using similar models, they did not consider the degradation of distortion caused by reverberation. They also did not quantify the effect of various speech enhancement DNN models, the structure of the intelligibility prediction DNN, and the selection of parameters during feature calculation on estimation accuracy. Accordingly, we compared two top-of-the-line speech enhancement DNN models and used their output to train intelligibility prediction DNNs for reverberant speech while also varying the parameters used in the feature calculation. Consequently, the linear correlation coefficient between subjective and estimated intelligibility came to 0.801 with the best combination.

著者

赤木 康之

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.3, pp.172-175, 2002-03-01 (Released:2008-04-17)

参考文献数

2

被引用文献数

1 1

著者

新田 義孝

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.111, no.10, pp.844-849, 1991-10-20 (Released:2008-11-20)

参考文献数

6

著者

加藤 明広 堀江 亮太

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.143, no.4, pp.397-405, 2023-04-01 (Released:2023-04-01)

参考文献数

25

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In this study, as a basic investigation for EEG-based visual image reconstruction, we investigated whether EEG signal features reflect shapes and colors of simple visual images which subjects viewed and whether the features can be discriminated. First, we investigated how the shapes and the colors are reflected in event-related potentials (ERP), the event-related spectrum perturbations (ERSP), and the inter-trial phase synchronization (ITC). The results showed statistically significant differences in ERP among the colors and ERP, ERSP and ITC among the shapes depending on time periods, frequency bands and electrodes. Second, based on the results, we explored learnable input data sets. Then, learnability for discriminating the shapes were shown in EEG waveforms on 100ms time periods in single trials at all channels and phase of time frequency analysis on the limited time-frequency domain and electrodes. Finally, we investigated whether two discriminators using LSTM and CNN discriminate the shapes from the learnable data for each subject. Then, it was found that accuracies of discrimination of the shapes were over a chance level with all the learnable data sets, subjects, and discriminators. We concluded that the distinct shapes can be discriminated from EEG signals by exploring appropriate features of input signals for discriminators.

著者

太田 豊

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.138, no.9, pp.753-756, 2018-09-01 (Released:2018-09-01)

参考文献数

12

被引用文献数

3 6

---

Sales of electric vehicle are rapidly growing in worldwide. Vehicle grid integration is important for mitigating impact of charging demand on the distribution feeders, realizing renewable powered charging from the rooftop photovoltaic and wind power generation, and contributing to the Vehicle-to-Grid ancillary services for the power systems. This paper reviews current trends of the vehicle grid integration R&D. Future prospective is also pointed out on the key issues such as an electrical interface, multiple services integration, and the electric vehicle living demonstration for open innovation.

著者

脇若 弘之 小松 大祐 下川 恭佑

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.398-401, 2003-07-01 (Released:2008-04-17)

被引用文献数

1 1

著者

執行 岩根

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.50, no.509, pp.1349-1360, 1930 (Released:2008-11-20)

参考文献数

14

著者

西村 博明

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.126, no.12, pp.1195-1198, 2006 (Released:2007-03-01)

参考文献数

16

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Properties of laser-produced plasmas (LPP) are described to generate intense radiation for various applications including extreme ultra-violet (EUV) light for next generation lithography. After an overview of LPP physics, state-of-the-art topics relevant to the 13.5 nm EUV source are described

著者

田中 裕

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.7, pp.681-684, 1986-07-20 (Released:2008-04-17)

参考文献数

3

著者

富田 忠詮

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.21, no.157, pp.479-513, 1901 (Released:2008-11-20)