著者

土田 哲

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.132, no.9, pp.626-629, 2012 (Released:2012-09-01)

被引用文献数

1

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著者

木村 優志 澤田 心大 入部 百合絵 桂田 浩一 新田 恒雄

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.132, no.9, pp.1473-1480, 2012-09-01 (Released:2012-09-01)

参考文献数

21

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In this paper, we propose a task estimation method based on multiple subspaces extracted from multi-modal information of image objects in visual scenes and spoken words in dialog appeared in the same task. The multiple subspaces are obtained by using latent semantic analysis (LSA). In the proposed method, a task vector composed of spoken words and the frequencies of image-object appearances are extracted first, and then similarities among the input task vector and reference sub-spaces of different tasks are compared. Experiments are conducted on the identification of game tasks. Experimental results show that the proposed method with multi-modal information outperforms the method in which only single modality of image or spoken dialog is applied. Moreover, the proposed method achieved accurate performance even if less spoken dialog is applied.

著者

滑川 徹 細田 康彦

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.132, no.9, pp.1446-1453, 2012-09-01 (Released:2012-09-01)

参考文献数

29

被引用文献数

1 2

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This paper deals with H∞ filter-based short-term electric load prediction considering characteristics of load curve. We propose a predictive method to forecast a future electric load demand for 36 hours from 0 PM, and then evaluate the peak and bottom of load curves in the next day. We propose a load model, estimates unknown parameters of model via H∞ filter using the separated data from holiday and weekday, a same pattern of the previous data have been chosen and assigned to parameters for the model. The simulation results show the effectiveness of the proposed prediction methodology.

著者

田中 啓一 野上 暁一 園田 義人

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.122, no.7, pp.362-368, 2002 (Released:2003-03-28)

参考文献数

10

被引用文献数

2

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The experiment to detect the acoustic wave of an audible frequency region in air by a visible laser beam was carried out, showing that the audible waves with relatively long wavelength from 34 mm to 1700 mm could be directly detected by using a diode laser light of 670 nm and 6 mW. The frequency property was measured for each sound pressure from 75 dB to 100 dB and it is shown that the amplitude of output signal is linearly proportional to the sound frequency, which is consistent with the theoretical prediction. Furthermore, property of directivities in the planes vertical and parallel to the optical axis of laser beam propagation and the spatial profiles of the laser diffraction pattern for each incident angle of a sound wave were measured. The directivity property in the vertical plane for each frequency (200Hz to 10kHz) is very similar to each other and the full angle of half-maximum of directivity is about 120°. On the other hand, the directivity in the parallel plane for each frequency is different from each other. The directivity for low frequency is relatively broad. The full angle of half-maximum of directivity for 10 kHz is smallest and about 90°.

著者

宮崎 保光

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.118, no.1, pp.99-104, 1997-12-20 (Released:2008-12-19)

参考文献数

12

被引用文献数

1 2

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High bit rate and high speed mobile radio communications using microwaves and millimeter waves are very attractive for wireless mega and giga bits LAN and video transmissions. Radio interferences due to multi-propagation paths and multiple scattering by street buildings and natural structures of hills and trees are very important problems for high bit rate mobile radio communications. Real time high speed signal processing for delayed fading noises may be required. Optical signal processing using optical and radio interactions are most useful method to accomplish real time high speed signal processing. Fundamental properties and applications of optical signal processors using optical active waveguide devices are shown for high bit-rate mobile communications.

著者

相原 良太 横山 明彦 野見山 史敏 小杉 成史

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.132, no.1, pp.86-94, 2012-01-01 (Released:2012-01-01)

参考文献数

13

被引用文献数

3 9

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In recent years, a substantial amount of photovoltaic (PV) generations have been installed in power systems. However, the power output from the PVs is random and intermittent in nature. Therefore, the PV generations pose many challenges to the power system operation. To solve these issues, we propose that pumped storage hydro power plant (PSHPP) is used effectively. In this paper, a new method for scheduling effective operating patterns for PSHPP that make it possible to improve both reliability and economy is presented.

著者

桑山 顕

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.131, no.10, pp.801-804, 2011-10-01 (Released:2011-10-01)

参考文献数

7

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The mega-solar demonstration project named “Verification of Grid Stabilization with Large-scale PV Power Generation systems” had been completed in March 2011 at Wakkanai, the northernmost city of Japan. The major objectives of this project were to evaluate adverse impacts of large-scale PV power generation systems connected to the power grid and develop output control technologies with integrated battery storage system. This paper describes the outline and results of this project. These results show the effectiveness of battery storage system and also proposed output control methods for a large-scale PV system to ensure stable operation of power grids. NEDO, New Energy and Industrial Technology Development Organization of Japan conducted this project and HEPCO, Hokkaido Electric Power Co., Inc managed the overall project.

著者

道山 哲幸

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.131, no.8, pp.558, 2011-08-01 (Released:2011-08-01)

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著者

横山 茂 関岡 昇三

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.129, no.5, pp.572-575, 2009-05-01 (Released:2009-05-01)

参考文献数

14

被引用文献数

5 13 3

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The rapid increase of wind power plants and enlargement of capacity makes the lightning problem of the wind power plants including blades serious. This report summarizes the result of the comprehensive surveillance study carried out for these several years. The contents lightning outages, the lightning phenomena and the result of the electric discharge experiment in connection with the measure against lightning of a windmill blades. Furthermore, the state of the present condition of the protective measures in the blades of windmill, mechanical parts, connecting power lines and communication lines was also considered. Especially grounding methods for wind power plants are considered.

著者

七原 俊也

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.129, no.5, pp.645-652, 2009-05-01 (Released:2009-05-01)

参考文献数

14

被引用文献数

7 13

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Wind power provokes increasing concerns on its impacts on a power system as many wind power generators have been integrated to a power system. One of the concerns is a challenge to keep supply-and-demand balance in a power system.Battery energy storage systems (BESS) installed at a wind farm are considered as a promising option for the challenge. Two types of operation strategies were proposed for its operation: fluctuation mitigation and scheduled output types. On the other hand, in order to constitute an economical BESS, selecting battery size as small as possible is vital. However, for the scheduled output operation, no study has been published both on the required battery size and on a methodology to examine the size.This paper proposes a methodology to evaluate the required kWh capacity of battery for the scheduled output operation using accumulated prediction error of a wind farm. The methodology evaluates a standard deviation of accumulated prediction error with autocovariance functions of prediction error. Based upon the statistical characteristics obtained for actual prediction error of wind power, the paper presents results of a sample study to show the effectiveness of the methodology.

著者

田中 隆治 吉岡 理文

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.131, no.11, pp.1895-1900, 2011-11-01 (Released:2011-11-01)

参考文献数

7

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In recent years, Augmented Reality (AR) becomes the focus of attention as a technology for obtaining some information. Most AR systems have used some markers to display any information. However, since markerless AR systems can be used intuitively, they are researched actively.In this paper, we study about the AR system based on the hand recognition as a markerless system. The reason why we used a hand is that we don't need to prepare or carry on any tool, and can easy to watch any information on a hand. Taehee Lee et al. introduced HandyAR which employ the hand recognition. In this method, there are some problems. At first, when the method learns skin model, it needs many learning data. This is because it uses RGB color model. Secondly, it is difficult to get hand because hand images which are extracted by the skin model have noise. Thirdly, the method uses finger positions to estimate the hand coordinate. Therefore it is sensitive to finger state. We improved HandyAR to solve these problems. Experimental result showed that our method had higher performance than conventional methods.

著者

津田 英隆 白井 英大 寺邊 正大 橋本 和夫 篠原 歩

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.129, no.12, pp.1201-1211, 2009-12-01 (Released:2009-12-01)

参考文献数

11

被引用文献数

4 5

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The conventional semiconductor yield analysis is a hypothesis verification process, which heavily depends on engineers' knowledge. Data mining methodology, on the other hand, is a hypothesis discovery process that is free from this constraint. This paper proposes a data mining method for semiconductor yield analysis, which consists of the following two phases: discovering hypothetical failure causes by regression tree analysis and verifying the hypotheses by visualizing the measured data based on engineers' knowledge. It is shown, through experiment under the real environment, that the proposed method detects hypothetical failure causes, which were considered practically impossible to detect, and that yield improvement is achieved by taking preventive actions based on the detected failure causes.

著者

青木 徹 小池 昭史 奥之山 隆治

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.131, no.10, pp.692-695, 2011-10-01 (Released:2011-10-01)

参考文献数

3

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著者

客野 貴広 服部 紀公士 伊藤 衡平 恩田 和夫

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.124, no.4, pp.605-611, 2004 (Released:2004-07-01)

参考文献数

16

被引用文献数

1

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Recently the high attention for fuel cell electric vehicle (FCEV) is pushing to construct the hydrogen supplying station for FCEV in the world. The hydrogen pressure supplied at the current test station is intended to be high for increasing the FCEV’s driving distance. The water electrolysis can produce cleanly the hydrogen by utilizing the electricity from renewable energy without emitting CO2 to atmosphere, when it is compared to be the popular reforming process of fossil fuel in the industry. The power required for the high-pressure water electrolysis, where water is pumped up to high-pressure, may be smaller than the power for the atmospheric water electrolysis, where the produced atmospheric hydrogen is pumped up by compressor, since the compression power for water is much smaller than that for hydrogen gas. In this study the ideal water electrolysis voltage up to 70MPa and 523K is estimated referring to both the results by LeRoy et al up to 10MPa and 523K, and to the latest steam table. By using this high-pressure water electrolysis voltage, the power required for high-pressure hydrogen produced by the high-pressure water electrolysis method is estimated to be about 5% smaller than that by the atmospheric water electrolysis method, by assuming the compressor and pump efficiency of 50%.

著者

中島 翔太 北園 優希 宮内 真人 芹川 聖一

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.130, no.1, pp.25-26, 2010-01-01 (Released:2010-01-01)

参考文献数

3

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A new sensor to detect a smile of a person is proposed in this paper. When a person smiles, the shape of cheeks changes. The change is used for the detection of the smile. The sensor consists of a infrared LED, a photodiode and a few electronic parts. When the sensor detects a smile, at first infrared light is irradiated on a cheek. Then the sensor detects the smile by using the strength of light reflected from the cheek. As a result, the sensor is simple and can detect a smile.

著者

樋口 寛晃 旭 健作 佐川 雄二 杉江 昇

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.12, pp.2439-2445, 2004 (Released:2005-03-01)

参考文献数

18

被引用文献数

1 2

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We propose a method for separating speeches using two spectrograms. First, two spectrograms are generated from voices recorded with a pair of microphones. The onsets and the offsets of the frequency components are extracted as the features using image processing techniques. Then the correspondences of the features between the spectrograms are determined and the intermicrophone time differences are calculated. Each of frequency components with the common onset/offset occurrences and time difference are grouped together as originating one of the speech signals. A set of band-pass filters are generated corresponding to each group of frequency components. Finally, each of the separated speech signals is extracted by applying the set of band-pass filters to the voice signal recorded by a microphone. Experiments were conducted with the mixture of a male speech sound and a female speech sound consisting of Japanese vowel and contain consonant. The evaluation results demonstrated that the separation was done reasonably well with the proposed method.

著者

奥乃 博 中臺 一博

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.131, no.3, pp.159-163, 2011-03-01 (Released:2011-03-01)

参考文献数

11

被引用文献数

1

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本記事に「抄録」はありません。

著者

上田 祐樹

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.128, no.12, pp.812-815, 2008-12-01 (Released:2008-12-01)

参考文献数

18

被引用文献数

2

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著者

加藤 省三 荒木 睦大 小越 康宏 谷口 秀次 森 幹男

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.130, no.6, pp.1054-1060, 2010-06-01 (Released:2010-06-01)

参考文献数

20

被引用文献数

1

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The processing of kana-to-kanji conversion can be classified into two categories of processing: The first is the processing to detect the boundaries of words in non-segmented kana strings, and the second is the processing to select the candidate of kanji-kana words. Also, the methods of kana-to-kanji conversion can be mainly classified into two types from the point of view of the two processing described above: One is to conduct simultaneously these two processing (called Method-A), and the other is to conduct sequentially them (called Method-B), namely, to detect the boundaries of kana words by using Markov chain model of kana words, and then to convert kana words to kanji-kana words and to select the maximum likely candidates by using Markov chain model of kanji-kana words. This paper evaluates two types of kana-to-kanji conversion method (Method-A and Method-B) by using 2nd-order Markov chain model of words. Through the experiments by using statistical data of daily Japanese newspaper, Method-A and Method-B are evaluated by the criteria of the accuracy rate of conversion, the conversion processing time and the memory capacity. From the results of the experiments, it is concluded that the Method-B is superior to Method-A in the conversion processing time and the memory capacity and is effective in kana-to-kanji conversion of bunsetsu.

著者

河原 英紀

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.130, no.6, pp.360-363, 2010-06-01 (Released:2010-06-01)

参考文献数

26

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