著者

山中 隆 鹿嶋 雅之 佐藤 公則 渡邊 睦 緒方 淳

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.129, no.5, pp.792-799, 2009-05-01 (Released:2009-05-01)

参考文献数

11

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Many researches have been done as for outdoor scene recognition by analyzing optical flow information. However, a practical driver-oriented system has not been proposed yet that notices the “Risk degree” when multiple obstacles exist, such as, parking cars and pedestrians. This article presents a new method to detect stand still obstacles using the “model flow” corresponding to optical flow field where there is no obstacle. The model flow is calculated using the knowledge as for navigation environments. Standard Points which are regularly set on image coordinates are transformed to Environment Points on road plane using several parameters such as, steering angle and camera tilt angle. Stand still objects are automatically detected by analyzing the difference between a model flow field and a real optical flow field which is acquired by an in-vehicle camera image. The algorithms have been installed in a desktop PC by Microsoft Visual C++6.0 programs. Experimental results by several kinds of outdoor scenes have shown the effectiveness of the proposed method. Total detection ratio is 91.0% and that in Dangerous case is 100%.

著者

辻 大亮 陶山 健仁

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.129, no.1, pp.79-86, 2009-01-01 (Released:2009-01-01)

参考文献数

16

被引用文献数

1

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This paper presents a novel method for moving sound source localization and its performance evaluation in actual room environments. The method is based on the MUSIC (MUltiple SIgnal Classification) which is one of the most high resolution localization methods. When using the MUSIC, a computation of eigenvectors of correlation matrix is required for the estimation. It needs often a high computational costs. Especially, in the situation of moving source, it becomes a crucial drawback because the estimation must be conducted at every the observation time. Moreover, since the correlation matrix varies its characteristics due to the spatial-temporal non-stationarity, the matrix have to be estimated using only a few observed samples. It makes the estimation accuracy degraded. In this paper, the PAST (Projection Approximation Subspace Tracking) is applied for sequentially estimating the eigenvectors spanning the subspace. In the PAST, the eigen-decomposition is not required, and therefore it is possible to reduce the computational costs. Several experimental results in the actual room environments are shown to present the superior performance of the proposed method.

著者

電子・情報・システム部門大会委員会

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.140, no.1, pp.NL1_1-NL1_18, 2020-01-01 (Released:2020-01-01)

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.140, no.1, pp.NL1_3, 2020-01-01 (Released:2020-01-01)

著者

飯田 賢一 中田 佳孝 平 俊男 鎌野 琢也 鈴木 茂行

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.123, no.10, pp.1806-1812, 2003 (Released:2004-05-28)

参考文献数

16

被引用文献数

1

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In this paper, an application of genetic algorithm for generation of evolutionary initial poses of a quadrupedal robot which reduced degrees of freedom is described. To reduce degree of freedom, each leg of the robot has a slider-crank mechanism and is driven by an actuator. Furthermore we introduced the forward movement mode and the rotating mode because the omnidirection movement should be made possible. To generate the suitable initial pose, the initial angle of four legs are coded under gray code and tuned by an estimation function in each mode with the genetic algorithm. As a result of generation, the cooperation of the legs is realized to move toward the omnidirection. The experimental results demonstrate that the proposed scheme is effective for generation of the suitable initial poses and the robot can walk smoothly with the generated patterns.

著者

内舘 光 猪田 良介 辻 俊明 阿部 茂

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.6, pp.578-584, 2009-06-01 (Released:2009-06-01)

参考文献数

18

被引用文献数

2 5

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This paper proposes a real-time image processing system for wheelchair recognition at elevator lobby. This system extracts objects with frame difference method. From the image of extracted objects, heads of people are detected by the Hough transform. Vertical shooting from ceiling improves the performance of people counting since the detected head has high roundness and occlusion of people is prevented. Two feature quantities are introduced to recognize wheelchairs. They are the area value and the ratio of traveling length to vertical length. Since these quantities require a method for drawing the contour line. This paper proposes a new simple method to draw a contour line. The effectiveness of this system is confirmed through experiments.

著者

久野 弘明 高島 充 大川井 宏明

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.124, no.4, pp.935-940, 2004 (Released:2004-07-01)

参考文献数

12

被引用文献数

1 3

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In this study, the possibility of the measurement of respiration, heart beat, and body movement on a bed was examined using the dynamic air-pressure sensor aiming at a daily health monitoring. The dynamic air-pressure sensor measures vital information using a change of air pressure. Twelve healthy volunteers participated in this study. The dynamic air-pressure sensor was installed under the bed mat and respiration and heart beat information were measured. This information was compared with the standard waveforms obtained from respiratory belt transducer and the electrocardiograph. As a result, both waveforms demonstrate a high correlation, and confirmed the validity of this method. A change of waveform and a quantitative evaluation of respiration, heart beat, and body movement measured from during sleep using this sensor can be useful for a daily health monitoring.

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 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.122, no.6, pp.591-600, 2002-06-01

参考文献数

25

被引用文献数

6 13

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Signal processing based on frequency polarity has been attracting wide attentions due to its potential industrial-applications. It is popular to employ two vector-rotators for such signal processing. But, It was very recently reported that equivalent signal processing effect can be attained in a much simpler manner using two-input two-output filters in the D-module. This paper further investigates a class of characteristic-varying systems in the D-module, which contains the filters in the D-module as a special case, and gives new analytical results on their properties from viewpoints of existence, realization and stability. If the results are applied to filter problems, n-th order D-module filters in new forms can be easily and directly obtained, whose stability and response equivalent to the associated filters with vector-rotators are guaranteed. If the results are applied to AC motor modeling problems, dynamic models and block diagrams of AC motors in general reference frame are easily and directly obtained. Very general and useful analyses are given for newly proposed a class of characteristic-varying systems in the D-module that have potential usefulness in various industrial applications including control of magnetic bearing system, analyses and active compensations of power systems, and sensorless drives of AC motors.

著者

山口 章三郎

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.101, no.11, pp.1057-1062, 1981-11-20 (Released:2008-04-17)

参考文献数

12

著者

菊池 喜充

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.85, no.925, pp.1623, 1965-10-01 (Released:2008-11-20)

著者

米澤 保雄 長野 忍 岩崎 唯史

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. C (ISSN:03854221)

巻号頁・発行日

vol.117, no.12, pp.1802-1810, 1997

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In this paper, we propose an algorithm based on Thymus Learning System (TLS) for elucidating an emergence of complexity generation which an elongation system generates with the self-nonself recognition mechanism. TLS has the immunological tolerance as an incorporation of non-self. TLS shows various interesting features from the viewpoint of the information engineernings such as immunological memory and tolerance, pattern recognition. We present that our immune system provides a suitable methology for a complexity emergent problem of the self-defense process in evolution.

著者

脇若 弘之

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.124, no.1, pp.36-39, 2004-01-01 (Released:2008-04-17)

参考文献数

5

著者

森實 俊充 木村 紀之 大森 英樹

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.134, no.10, pp.NL10_3, 2014 (Released:2014-10-01)

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Our research focuses on the power conversion system and the electrical machinery system based on the powerelectronics technology. Our research group consists of three laboratories. Three faculty members, 38 students are with the research group.

著者

小鹿 聡士 坂下 友一 笈川 信一郎

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.139, no.12, pp.998-1004, 2019-12-01 (Released:2019-12-01)

参考文献数

12

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In the conventional bus voltage controller, the concentration of heat generation in a specified circuit has been an obstacle to miniaturization. In this paper, we describe the control algorithm and the experimental result of the direct and distributed switching control (DDSC) method devised to disperse the generation of heat. Additionally, to improve the transient response while reducing the steady state switching frequency, which can reduce the generation of heat, we investigated the application of a transient mode that temporarily speeds up the control cycle when load fluctuation is detected. We also report the calculation of the heat reduction effect that can be achieved by combining these methods.

著者

山村 昌

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.5, pp.421-425, 1991-05-20 (Released:2008-11-20)

参考文献数

3

著者

勝部 昭明

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.6, pp.296-299, 2002 (Released:2003-03-28)

参考文献数

26

被引用文献数

1

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This paper reports recent research activities and developments of odor sensor and taste sensor. The application fields and market places of these sensors are expanding by the remarkable progress both in sensing devices and signal processing engines. These sensor developments are first reviewed by comparing the differences between odor and taste detection technologies. Then, the quantitative analysis method of taste sensor is discussed and finally mentioned about a flavor sensor consisting of taste sensor and odor sensor.

著者

山田 圭佑

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.137, no.2, pp.81-84, 2017-02-01 (Released:2017-02-01)

被引用文献数

2

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1.はじめに「卓球ロボット」と聞くと,どのようなロボットを想像するだろうか。ドイツの産業用ロボットと卓球選手が対戦する動画を見た方もおられるだろうし,人型ロボットが卓球をする姿を想像される方もおられるだろう。本稿で紹介する卓球ロボットは,人とロボットが卓球の

著者

藤森 祥弘

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.119, no.10, pp.590-595, 1999-10-01 (Released:2008-04-17)

著者

喜熨斗 智也 白川 透 長谷川 瑛一 齋藤 明香 田中 秀治

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.134, no.1, pp.16, 2014-01-01 (Released:2014-01-01)

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本記事に「抄録」はありません。

著者

成田 芳正

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.5, pp.300-303, 2004-05-01 (Released:2008-04-17)

参考文献数

2