著者

河合 洋一

出版者

The Institute of Electrical Engineers of Japan

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.118, no.9, pp.923-926, 1998-09-01 (Released:2008-12-19)

参考文献数

3

著者

宮本 陽一郎

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会誌 = The journal of the Institute of Electrical Engineers of Japan (ISSN:13405551)

巻号頁・発行日

vol.114, no.9, pp.577-581, 1994-09-20

著者

廣田 敦志 長井 聡 中岡 睦雄

出版者

The Institute of Electrical Engineers of Japan

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.119, no.2, pp.264-265, 1999-02-01 (Released:2008-12-19)

参考文献数

2

被引用文献数

1

---

The authors have proposed that ΔΣ modulator is effectively applied to an inverter system with PWM pattern generating scheme. The major features of ΔΣAE modulator is the inherent nature of spread spectrum and simple configuration. On the other hand, ΔΣ modulator can be considered as a sort of error amplifier. Using proposed ΔΣ modulator, an automatic amplitude control function will be realized. In this paper, an automatic amplitude control performance of ΔΣ modulated voltage source inverter is described. The results of computer simulation and FFT analysis indicate that output influence due to DC source variation are effectively reduced by ΔΣ modulator. Furthermore, a possibility of system design simplification is described in this paper.

著者

坂本 雄吉

出版者

The Institute of Electrical Engineers of Japan

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.112, no.9, pp.755-759, 1992-09-20 (Released:2008-12-19)

参考文献数

7

出版者

The Institute of Electrical Engineers of Japan

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.133, no.7, pp.NL7_4-NL7_4, 2013

著者

森本 雅之 押谷 克己 佐藤 進司 角藤 清隆

出版者

The Institute of Electrical Engineers of Japan

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.110, no.12, pp.1266-1272, 1990-12-20 (Released:2008-12-19)

参考文献数

16

---

The voltage modulation factor of the magnetic flux control PWM method is discussed. The fundamental component of the inverter output voltage is proportional to the radius of the flux locus. The modulation factor is derived by the theoretical study on the length of the flux locus produced from inverter output voltage.As a result, the modulation factor of the magnetic flux control PWM method is calculated by the portion of zero vectors in the PWM pattern. The modulation factor is proportional to the output voltage from zero to 12/π2. By using proposed modulation factor, the magnetic flux control PWM method can control output voltage from zero to over-modulation.Simulation results and experimental results are also shown.

著者

垣本 直人 林 文彬 杉原 弘章

出版者

The Institute of Electrical Engineers of Japan

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.114, no.4, pp.343-351, 1994-04-20 (Released:2008-12-19)

参考文献数

16

---

A present-day power system is operated with high reliability, and it is rare that a blackout extends all over the system. However, considering its influence upon the society, it is prudent to prepare plans for restoring the system swiftly and securely. This paper deals with automatic power supply to loads after a complete blackout of the system. First, taking characteristics of generators, loads, and initial power sources into account, we propose a method of allocating several generators to each load, paralleling them to the system and supplying power to the load in sequence. Secondly, in order to remove imbalance between supply and demand of power, we propose a method of adjusting the amount of supply and generation according to a present imbalance and the sum of past ones. Thirdly, in order to automatically issue orders for start-up, parallel, follow-up, stand-by, and stop of generators, we set several rules for each power station, and make an expert system based on them. Lastly, we apply the expert system to a model power system, and verify that it can restore loads without any trouble for a complete blackout occured at any time of a day, and in any restoration pattern.

著者

Tomohiro Murase Kosuke Oiwa Akio Nozawa

出版者

The Institute of Electrical Engineers of Japan

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.138, no.9, pp.1148-1153, 2018-09-01 (Released:2018-09-01)

参考文献数

22

被引用文献数

4

---

In automated driving at Level 3, drivers constantly need to allocate attention to the driving environment to react immediately to a take-over request. However, the amount of attention of drivers to the driving environment has not been quantified. The objective of this study was a quantitative evaluation of the amount of attention to the driving environment, and the psychophysiological state of the driver, during automated driving at Level 3. Attention and driver state at Level 3 were evaluated using ERP and psychophysiological indices respectively with compared to Level 2. The dual task method was used, in which twelve subjects performed driving tasks (Level 2 and Level 3) on a driving simulation system while in parallel performing an auditory oddball task. The data showed that the amount of attention to the driving environment at Level 3 decreased in comparison to Level 2, as indirectly measured by a 19.2% increase in attention to the auditory oddball task. Sympathetic nervous system activity during Level 3 automated driving decreased as compared to Level 2. In the psychological state, comfortable feeling and arousal level decreased at Level 3.

著者

Genki Kato Kosuke Oiwa Tatsuya Iwaki Tomoharu Ishikawa Akio Nozawa

出版者

The Institute of Electrical Engineers of Japan

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.138, no.7, pp.805-811, 2018-07-01 (Released:2018-07-01)

参考文献数

20

被引用文献数

1

---

Selfies may have an effect on the psychophysiological state. The objective of the present study was to evaluate the psychophysiological state by providing feedback for selfies. The effect of the time period was also investigated. The period from the date a selfie was taken to the experiment date was configured as 2 conditions: a Short period (1-40 days) and a Long period (41-80 days). In this study, the evocation of emotions was attempted by providing feedback for four types of selfie 1: good face, 2: bad face, 3: good psychological state, and 4: bad psychological state. “Comfort emotion”, “Like emotion”, and “Awareness” significantly increased when providing feedback for a selfie evaluated as having a good face and a good psychological state. The experimental results using two-way analysis of variance revealed that the physiological state was not affected by the time period, but the psychological state was affected by the time period. The combination of (Positive Face Evaluation) × (Long period) selfies had more positive effect on “Awareness”.

著者

Hiroki Ito Shizuka Bando Kosuke Oiwa Akio Nozawa

出版者

The Institute of Electrical Engineers of Japan

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.138, no.7, pp.812-821, 2018-07-01 (Released:2018-07-01)

参考文献数

39

被引用文献数

1

---

An imbalance of the circadian rhythm due to an irregular lifestyle leads to autonomic dystonia. The long-hour variations of the physiological indices such as core temperature and heart rate variability, associated with the autonomic nervous activity, have been focused. Additionally, the relationships between these physiological indices and facial skin temperature have been reported. The objective of this study is to identify the day-long variable components of facial thermal images (FTIs) to evaluate the corresponding variations of autonomic nervous activity by non-contact measurement. In this study, the measured FTIs were subjected to independent component analysis (ICA). Additionally, multiple regression analysis was performed to estimate the relationships between independent components, extracted from FTIs, and other psychophysiological indices, associated with autonomic nervous activity. As a result, the facial day-long variable components, representing the reproducible rhythm through multiple days, were identified by applying ICA to several different combinations of FTIs. Moreover, these components were associated with the axillary temperature. Therefore, the long-period variations, associated with autonomic nervous activity, could be evaluated from the facial skin temperature.

著者

Kosuke Oiwa Shizuka Bando Akio Nozawa

出版者

The Institute of Electrical Engineers of Japan

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.138, no.7, pp.783-789, 2018-07-01 (Released:2018-07-01)

参考文献数

36

---

Hypertension is one of the leading risk factors for cerebrovascular, cardiovascular, and chronic kidney diseases. Regular measurement and monitoring of blood pressure is important to decrease or prevent pathogenesis of diseases. Contactless measurement of blood pressure using a smartphone application, can enable regular monitoring. The objective of this study is to construct a system which can monitor blood pressure anytime and anywhere. In this study, contactless blood pressure assessment was attempted, using facial visible image analysis and created individual models for blood pressure estimation. Variation in brightness of the skin color was obtained from facial visible images and applied to independent component analysis, which is one of the blind source separation methods to extract the facial photoplethysmogram (PPG) component using a proposed system. Amplitude and phase of facial PPG component were used as indices for blood pressure. A correlation analysis between facial PPG component and blood pressure was performed and created individual models for blood pressure estimation.

著者

井上 昌睦 石橋 佑斗 田島 拓弥

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.135, no.9, pp.603-606, 2015

---

1.はじめに 出力が1 MWを超える太陽光発電施設であるメガソーラーは,近年の再生可能エネルギーへの関心の高まりと,2012年に開始された再生可能エネルギーの固定価格買い取り制度に

著者

中村 貴弘 早川 正士

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.124, no.8, pp.1012-1020, 2004-08-01

参考文献数

17

被引用文献数

1 3

---

Mesospheric optical phenomena(including sprites) are becoming an interesting subject from the standpoint of atmosphere-ionosphere coupling. This paper deals with our observation of sprites associated with winter thunderstorms in the Hokuriku area and we show the characteristics of those sprites and their parent lightning discharges. Although the scale of Japanese lightning in winter is very small as compared with the MCS (Mesoscale Convective System) for the summer continental lightning, the essential quantities (polarity, charge transfer etc.) are found to be nearly the same as those for those MCS. However, there might be required an additional factor, such as the self-organization of the lightning.

著者

山中 章広 渡邉 朝紀 松岡 成康 今村 洋一

出版者

The Institute of Electrical Engineers of Japan

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.119, no.6, pp.825-836, 1999-06-01 (Released:2008-12-19)

参考文献数

11

被引用文献数

2

---

Recently trains raise speed and reduce the motor vehicle ratio. It is needed, therefore, to utilize adhesion force more effectively. In running tests of high speed Shinkansen train, it has become clear that slip and readhesion repeat under strict adhesion conditions as far as they rely on the conventional concept of readhesion control. So we have developed a new control method “Anti-slip Readhesion Control with Presumed Adhesion Force” and confirmed in running tests its various effects. Furthermore, we apply it to commuter transport electric cars to research various points such as effects of control improvement, control parameters which are suitable for it, differences between with presuming and without presuming adhesion force, and so on. In running tests, we confirmed that we can utilize adhesion force more effectively by applying the newly developed control method to commuter transport electric cars.

著者

網干 光雄 大浦 泰 小林 輝雄 円谷 哲男 上野 勝禧 金子 誠

出版者

The Institute of Electrical Engineers of Japan

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.116, no.4, pp.490-496, 1996-03-20 (Released:2008-12-19)

参考文献数

15

被引用文献数

1 1

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For Projected Shinkansen, it is necessary to develop an economical overhead catenary system allowing stable train operation at high-speed and meeting the transport demands. In order to develop a new overhead catenary system for this purpose, we designed a high tension simple catenary system with CS contact wire (Copper contact wire with Steel-core), and constructed this system on Tohoku Shinkansen line for operation test. During 4 years, we measured contact loss of pantograph, uplift and stress of contact wire, its maintainability including the wear of contact wire, and others. The test results so far obtained prove that its performance is as high as that of high-tension heavy compound catenary system.

著者

芹川 正 白井 誠一

出版者

The Institute of Electrical Engineers of Japan

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.110, no.10, pp.675-678, 1990-10-20 (Released:2008-07-15)

参考文献数

10

著者

赤木 泰文

出版者

The Institute of Electrical Engineers of Japan

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.124, no.8, pp.737-742, 2004 (Released:2004-11-01)

参考文献数

6

---

This paper describes techniques that Japanese power electronics engineers can use to improve the quality of their technical papers written in English and the accompanying technical presentations. These techniques are based on the experience that the author has gained by participating in international conferences. Such techniques are important to discuss because the significant differences exist in writing and presentation styles between Japanese and American engineers. The author believes that such style differences are caused by differences between the Japanese and American cultures. The objective of this paper is to help Japanese engineers understand these cultural differences and improve their technical communication skills in English. The paper also includes some practical tips on writing and presentation techniques for improving the quality of their technical communications in English.

著者

山口 達史 長沼 修 松岡 正憲 高野 誠治 前崎 恒司 友永 和之 中村 浩

出版者

The Institute of Electrical Engineers of Japan

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.121, no.8, pp.997-1004, 2001-08-01 (Released:2008-12-19)

参考文献数

6

---

Though the power supply to airplane warning light installed in transmission line tower is generally carried out by low voltage distribution line, in especially basic transmission line over 500kV with many mountainous area the inside of transmission line, there are many cases in which there is no a distribution line near, and considerable labor and cost for the power supply are needed. Then, authors developed electromagnetic induction type power source equipment which took out the electric power by using current transformer from induced current which flows in overhead earth wire. First, the power source equipment which used the penetration type for CT for the power: was developed, and the demonstration experiment for about 10 months was carried out in Tokyo Electric Power Co., Inc. Minami Niigata trunk line. As the result it was able to be verified that operating characteristic and environment-resistant characteristics of the power source equipment were good. For the purpose of applying to Tokyo Electric Power Co., Inc. Minami Iwaki trunk line in continueing, the power source equipment which used winding type for CT for the power was developed. This equipment finishes the installation construction in July, 1999, after the test in the factory is carried out, and it is carrying out the practical use in Minami Iwaki trunk line at present. In this paper, the content is reported on power source equipment applied to Minami Iwaki trunk line on EMTP analysis of the overhead earth wire current and outline of developed power source equipment and means of application to the continuous line road and operation situation in the operation and comparison examination with analytic value.

著者

秋山 勇治

出版者

The Institute of Electrical Engineers of Japan

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.113, no.12, pp.1487-1488, 1993-12-20 (Released:2008-12-19)

参考文献数

3

著者

廣田 憲之 北沢 宏一

出版者

The Institute of Electrical Engineers of Japan

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.116, no.9, pp.769-776, 1996-08-20 (Released:2008-07-15)

参考文献数

38

被引用文献数

1 1