文献一覧: 一般社団法人電気学会 (出版者)

1 0 0 0 OA インテグラルイメージング方式

著者: 平山雄三
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.127, no.9, pp.588-590, 2007-09-01 (Released:2007-09-05)
参考文献数: 7

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2020-03-11 01:04:14
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1 0 0 0 拡張性の高いデータメディエータの提案と鉄道ナビゲーションへの適用試行

著者: 米原三揮半田岳志松鹿弥生小泉稔富山友恵
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.3, pp.398-408, 2020-03-01 (Released:2020-03-01)
参考文献数: 15

The demand for navigation is rising as railway transportation services is becoming complex. Real-time data integration from multiple business systems is required for passenger-oriented navigation. Conventional mediators, real-time data integration technique which converts queries and data between business systems and applications based on their each schemes and mapping between them, can not follow expansion both of applications and business systems. In this paper, we propose a new mediator to solve the scalability problem with core-global scheme, which allows independednt mappings with each schemes of them and expresses principal components of business systems and applications. The 2 features of core-global scheme reduce effects of scheme changes on other mappings so that the mediator has scalability. Furthermore, we propose an architecture of the mediator that reduces effectivity loss of queries. We implemented a prototype and evaluated its scalability and query effectivity for an application of railway navigation.

2020-03-06 09:45:09
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1 0 0 0 社会変革の時代の工学教育

著者: 曄道佳明
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.140, no.3, pp.135, 2020-03-01 (Released:2020-03-01)

AI技術が牽引するデータ駆動型社会の到来や,未だ混沌とするグローバル化など,明らかに社会は質的変化を遂げようとしている。社会の発展に貢献することを前提とするエンジニアリングのあり方に対しても,変化の要請が起こることは自明であろう。となれば,それを支えるエンジ

2020-03-05 09:41:28
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1 0 0 0 サーボドライブDC給電システムのインピーダンス法による安定性解析

著者: 桐淵岳財津俊行土井昌志日下佳祐伊東淳一
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.3, pp.184-193, 2020-03-01 (Released:2020-03-01)
参考文献数: 27
被引用文献数: 5

Servo drive motor systems using PWM inverters have become very popular in the industrial market owing to their excellent control over torque, speed and position. Recently, problems of EMI noise and complexity of wiring from 3-phase PWM inverter power line cables have become critical issues in factories. In addition, using the regenerative energy of a motor has become important. A DC bus system can be a solution to these problems and demands. However, the DC bus system for servo drives has a risk of system instability because of interference between the DC bus and the servo drives. In this paper, an impedance-based stability analysis method is proposed that can predict the stability by only using the I/O (impedance) characteristics instead of all the system properties. The experimental results show that this method is useful.

2020-03-02 10:30:26
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1 0 0 0 バリアブルキャパシタによる電圧バランス制御機能を備えた多段FET双方向コンバータ

著者: 石倉祐樹細谷達也山本真義
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.3, pp.168-174, 2020-03-01 (Released:2020-03-01)
参考文献数: 15

This paper presents a bidirectional converter with multi-stage FETs featuring voltage balance control function using variable capacitors. The proposed converter is constructed using low-voltage Si-FETs in a series connection, and it improves the voltage balance between the drain-source voltages of the series connected FETs in the OFF period. Using the converter figure of merit (FOM), which can estimate the converter losses from the specifications of the FETs, the effectiveness of the proposed converter is compared to that of a converter using SiC-FETs. The factors of the voltage unbalance are analytically clarified using the equivalent circuit. The principle of voltage balance control function using the variable capacitor is discussed. The experimental results show that the proposed converter can achieve a maximum power conversion efficiency of 99.2%.

2020-03-01 14:23:13
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1 0 0 0 PRBSを用いた電力変換器による太陽電池のインピーダンス測定手法

著者: 武智滉司横井健志柿ヶ野浩明
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.3, pp.140-147, 2020-03-01 (Released:2020-03-01)
参考文献数: 14
被引用文献数: 2

The output power of solar panels may decrease by degradation due to long-term usage and surface contamination. Methods to detect these problems are necessary for photovoltaic generation to be more widespread. AC impedance methods are used for electrochemical devices to inspect the inside situation of solar panels. In this study, we applied an ac impedance method to solar panels, which have some merits compared with the traditional methods. We added a small ac signal to the duty of a dc-dc converter to implement the ac impedance method. The small ac signal was a white noise generated by a pseudorandom binary sequence (PRBS) such that many frequency points can be measured simultaneously. Unlike traditional methods, this method can examine the solar panels when they are generating power. We measured shaded and nonshaded solar panel impedances and compared with the experimental results. From the results, we can show the potential to distinguish the shaded panel or the unshaded panel based on the difference of the impedance characteristics.

2020-03-01 14:21:57
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1 0 0 0 系統連系インバータによる擬似ランダム信号を使用した誘導性負荷の推定に関する実験的検討

著者: 寺口直希南政孝
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.3, pp.336-337, 2020-03-01 (Released:2020-03-01)
参考文献数: 5
被引用文献数: 2

The grid connection inverter is built in the PCS (Power Conditioning Subsystem) for the distributed power supply, such as photo voltaic system. Recently, there has been considerable advances in the research on power flow using PCS. In order to adjust the power in the PCS, it is necessary that the grid connection inverter of the PCS predicts the load and output fluctuation in the customer side. Therefore, this paper investigates a load estimation in the grid connection inverter of the PCS. The proposed estimation method adds a superimposing pseudo random binary sequence to the inverter reference. The validity of the proposed estimation method is verified experimentally. As a result, it is experimentally clarified that the estimation is possible even for inductive loads.

2020-03-01 14:03:18
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1 0 0 0 OA 温度補償SCカット水晶発振回路の一構成法

著者: 渡部泰明佐藤裕貴五箇繁善佐藤隆幸関本仁
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.127, no.8, pp.1192-1193, 2007-08-01 (Released:2007-09-01)
参考文献数: 3

To improve the temperature characteristics of SC-cut oscillators without degrading their phase noise and short term stabilities, an oscillator circuit has been designed. This circuit uses an AT-cut resonator as a temperature reference of the output frequency, that is, the oscillation frequency of the SC-cut circuit traces the temperature characteristics of the AT-cut resonator. Experimental results show that the frequency stability for the temperature is improved 30 times better than normal oscillators.