著者

Yuefei Gao Hajime Nobuhara

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.6, no.4, pp.252-257, 2017-07-01 (Released:2017-07-01)

参考文献数

18

被引用文献数

8

---

Decentralized trusted timestamping based on blockchains is used to protect a large variety of digital data. At present, in the case of trusted timestamping services, such related information is not included in the OP_RETURN field of a Bitcoin's transaction chain, which has a limited size (40 bytes). When OP_RETURN is extended, (e.g., with multiple OP_RETURN fields) the transaction is rejected by the Bitcoin network. We propose storing data in the blockchain by encoding into Bitcoin addresses. The transactions created by the proposed method are similar to the usual transactions; therefore, they will not be rejected. The proposed method expands the storage space to a maximum of N*20 bytes, thereby enabling the storage of additional information (e.g., file names, creator names, and keywords) as well as file hashes. We performed experiments with a picture and its copyright information. We set N =3, resulting in storage of 60 bytes of data. The experimental results indicate that the proposed method can timestamp a file in an average of 24 min at a possible cost of 0.24 USD. We believe that the proposed method can prove the existence and integrity of a digital file, which is helpful in copyright protection.

著者

鹿間 信介 水野 宏亮

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 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and Systems Society (ISSN:03854221)

巻号頁・発行日

vol.133, no.7, pp.1309-1315, 2013-07-01

参考文献数

14

---

We have conducted a series of studies on a non-contact groove sensing and reproduction of sound signal from phonograph records based on digital image and signal processing. Images of sound grooves were captured by a PC scanner having an appropriate resolution. After an image processing is performed to improve the image contrast, we have investigated filtering methods to extract the position of the groove edges. In addition, we have linearized the arc-shaped groove lines in order to make subsequent signal processing easy. Finally, we have attempted to reproduce the recorded sound waveform using a set of coordinates of the groove edges and created a WAVE-file for sound playback on PCs.

著者

藤野 篤哉 飛田 敏光 中川 久美子

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.117, no.7, pp.815-822, 1997-06-20 (Released:2008-12-19)

参考文献数

9

被引用文献数

4 1

---

With a view point of space factor in large-scale buildings, this paper first overviews several mass transportation systems and compares their characteristics. Then a loop-type independent-driven multiple-cage elevator system and its high-efficient control method are proposed, The multiple-cage elevator system can reduce its shaft space as half as that of normal elevator system. Computer simulations show the proposed control method can improve waiting time and round trip time, and restrain needless stops. The loop-type multiple-cage elevator system may be feasible for the third transportation system which fills the gap between elevators and escalators in the near future.

著者

松尾 豊 横山 明彦

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.120, no.8-9, pp.1061-1070, 2000-08-01 (Released:2008-12-19)

参考文献数

6

被引用文献数

2

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FACTS devices such as high-speed phase shifter and variable series capacitor enable us to control active power flow in order to avoid thermal constraints on transmission lines, resulting in an increase of the network loadability and a reduction of production cost. However where to place these devices is an essential matter because their effects considerably depend on the locations. From an economic point of view, the investment cost must be taken into account as well as the reduction of the production cost. Therefore we propose to maximize return on investment (ROI) by searching not only the best location of FACTS devices but also the rating of each device. This problem is expressed as combinatorial optimization problem nested by nonlinear optimization problem. To solve this problem, tabu search incorporated with nonlinear programming method is used. And we discuss the remedial control of FACTS devices and simultaneous consideration of multiple load conditions. By considering remedial control, we can make better use of FACTS devices. Multiple load conditions bring us more appropriate solutions. Because the consideration makes our problem more difficult to solve, some efforts are necessary to be made. Numerical results are shown for a 3-generater 41-line model system and a 5-generator 42-line model sysytem.

著者

Hirotaka Yamamoto Atsushi Iga Kaoru Ishihara Yuuichi Mita Hirohisa Suzuki

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Transactions on Industry Applications (ISSN:09136339)

巻号頁・発行日

vol.115, no.6, pp.702-711, 1995-05-20 (Released:2008-12-19)

参考文献数

33

被引用文献数

7 8

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In the design, operation and evaluation of a photovoltaic power generation systems (PV systems), it is particularly important to accurately estimate the total amount of annual electric power generated by PV system. The authors applied a new I-V curve construction method developed for the calculation of output power from a photovoltaic array in order to develop a practical “simulation program for the calculation of the amount of electric power generated by PV system.” The following items were clarified by this research.

著者

Tatsuaki Yasuda Masahito Katto Shunshiro Ohnishi Yutaka Kurioka

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Transactions on Electronics, Information and Systems (ISSN:03854221)

巻号頁・発行日

vol.115, no.12, pp.1566-1567, 1995-11-20 (Released:2008-12-19)

参考文献数

3

著者

Hirofumi Akagi Satoshi Ogasawara Hyosung Kim

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Transactions on Industry Applications (ISSN:09136339)

巻号頁・発行日

vol.119, no.12, pp.1461-1470, 1999-12-01 (Released:2008-12-19)

参考文献数

18

被引用文献数

5

---

This paper discusses “the p-q theory” and “the cross-vector theory” in three-phase four-wire systems, with the focus on similarity and difference between the two theories. They are perfectly identical if no zero-sequence voltage is included in a three-phase three-wire system. However, they are different in definition of the instantaneous active power and instantaneous reactive power in each phase if a zero-sequence voltage or current is included in a three-phase four-wire system. Based on both theory and computer simulation, this paper leads to the following conclusions: An instantaneous reactive-power compensator without energy storage components can fully compensate for the neutral current even in a three-phase four-wire system including a zero-sequence voltage or current, when a proposed control strategy based on the p-q theory is applied: However, the compensator cannot compensate for the neutral current fully, when a conventional control strategy based on the cross-vector theory is applied.

著者

Tetsuya Tanizaki Koji Ueda Masahiko Wakai

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Transactions on Industry Applications (ISSN:09136339)

巻号頁・発行日

vol.120, no.11, pp.1313-1320, 2000-11-01 (Released:2008-12-19)

参考文献数

14

---

The fire detection is very important to prevent a secondary disaster and to save the assistance for safe driving in the master plan of ITS. At present, the fire detectors, which have a high sensitivity, are used in order to detect the fire in tunnels. It has problems such that the detection area is very narrow and sensor head is fouled by exhaust fumes. Compared with the fire detectors, image sensor is suitable to detect the fire, because it can cover two-dimensional wide space. We had attempted elsewhere the fire detection, which compares two histograms with various shades of gray level, by means of image processing. However, there remained problems about the influence of passing vehicle in the actual outdoors environment. The flame has characteristic such that its state is unstable and repeats growth and decay. A new approach toward the fire detection based on fluctuation of the flame has been described in this paper. Conventional fire detectors could detect only a phenomenon of the fire. However, proposal method could detect not only the flame but also its position. We conducted simulation and field tests to verify the accuracy of this method, and confirmed the effectiveness.

著者

西村 敏博 江口 哲治 井上 猛 斉藤 正男 前島 靖 真嶋 政文 平地 克也

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 = 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.117, no.9, pp.1085-1091, 1997-09

参考文献数

17

被引用文献数

5 4

---

Cardiac pacemaker has to be changed in three to five years for the battery life. A patients must be performed an operation whenever a patient is changed cardiac pacemaker. The method employing secondary rechargeable battery is researched to extend the battery life. The secondary rechargeable battery is transcutaneously charged from outside the body. This paper presents a transcutaneous energy transmission system for a rechargeable cardiac pacemaker battery. The transcutaneous energy transmission system is constructed with a high frequency resonant inverter, a transcutaneous transformer and a rectifier circuit. The secondary transformer is piled and the coupling coefficient and the conversion efficiency are measured with an experimental set up. The results show as follows. The best diameter of the primary center core is 15[mm]. The best output voltage frequency is 10[kHz].

著者

渡邉 恵理子 石川 さゆり 太田 真衣子 小舘 香椎子

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. C (ISSN:03854221)

巻号頁・発行日

vol.127, no.4, pp.636-643, 2007

被引用文献数

1 1

---

We propose a high security facial recognition system using a cellular phone on the mobile network. This system is composed of a face recognition engine based on optical phase correlation which uses phase information with emphasis on a Fourier domain, a control sever and the cellular phone with a compact camera for taking pictures, as a portable terminal. Compared with various correlation methods, our face recognition engine revealed the most accurate EER of less than 1%. By using the JAVA interface on this system, we implemented the stable system taking pictures, providing functions to prevent spoofing while transferring images. This recognition system was tested on 300 women students and the results proved this system effective.

著者

Katsunori Taniguchi Hisaichi Irie

出版者

The Institute of Electrical Engineers of Japan

雑誌

The transactions of the Institute of Electrical Engineers of Japan.B (ISSN:03854213)

巻号頁・発行日

vol.105, no.10, pp.880-886, 1985-10-20 (Released:2008-12-19)

参考文献数

16

被引用文献数

2 7

著者

Yoshihide Aoshima Tatsuya Harada Hideo Ito

出版者

The Institute of Electrical Engineers of Japan

雑誌

The transactions of the Institute of Electrical Engineers of Japan.B (ISSN:03854213)

巻号頁・発行日

vol.107, no.11, pp.556-562, 1987-11-20 (Released:2008-12-19)

参考文献数

6

著者

小田切 司朗

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.129, no.9, pp.620-623, 2009-09-01

被引用文献数

5 1

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本記事に「抄録」はありません。

著者

雪田 和人 後藤 時政 水野 勝教 中野 寛之 一柳 勝宏 後藤 泰之 森 豪

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 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society (ISSN:03854205)

巻号頁・発行日

vol.130, no.1, pp.95-102, 2010-01-01

被引用文献数

3 2 2

---

Recently the importance of Monozukuri (manufacturing) has been watched with keen interest as a social; problem, which has a relation with schoolchildren's decline of their academic standards, pointed out by the reports of PISA of OECD and TIMSS, etc., and their "losing interest in science" and "dislike of science", some people worry about, which will lead to the decline of technology in the home industry, the top-class personnel shortage, and the decrease of economical power in this country in the future. In order to solve such a problem, science pavilions, universities, and academic societies of science and engineering etc. in various places hold "Monozukuiri Classrooms" or "Science Classrooms". We can say that various activities which try to hold off "losing interest in science" and "dislike of science." in the whole society. Under such a situation, Aichi Institute of Technology (AIT) to which we belong, also tries to contribute to the activity of solving the problem, and holds various engineering education lectures which intend for elementary, junior high school and senior high school students. AIT has held "The Whole Experience World" which tries to bring up a talented person who has a dream and hope towards science and technology, grows his/her originality, intellectual curiosity and spirit of inquiry, and supports the nation based on science and technology in the summer vacation since 2001.<br>This paper reports the result of a questionnaire about what kind of the long-term learning effect on the children who participated in "The Whole Experience World" and "Boys and Girls Robot Lectures". As the conclusion of the study, we can say that the lectures could give the participants who were interested in science and technology more interest. And we could give them the idea of what the study of science and technology is. As a result, we could contribute to the participants' decision of the courses' selection in life.

著者

海老原 大樹 和多田 雅哉 長嶋 健二

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.11, pp.1310-1316, 1993

---

This paper describes the improvements in launching stability and launching velocity of the linear accelerator (LAC).<br>The authors have designed and produced a railgun using the LAC for weaving loom shuttles. The LAC is an electromagnetic launcher which enable a projectile to be launched at a speed of more than 50m/s. It basically consists of an uni-pole linear DC motor and operates the same principle as DC rotary motors, the most difficult problem in this system being the stabilization of the current collection on the projectile.<br>Then we have conducted the various launch experiments. As a result, we have achieved that the carbon projectile was launched at a speed of 73m/s using double-stage type LAC.

著者

本橋 準 一ノ瀬 貴士 石川 忠夫 甲斐 隆章 金田 裕敏 石塚 隆司

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.119, no.1, pp.14-23, 1999-01-01 (Released:2008-12-19)

参考文献数

10

---

In recent years, enhancement of consciousness for energy saving and problem of environment are widely encouraging the installation of dispersed storage and generation (DSG) units such as co-generation and photo-voltaic generation. When a distribution line with the DSG is disconnected from the main source of utility, the DSG supplies power to the distribution line. The situation, namely islanding, creates various problems for the reliable and safe operation of the distribution line. Thus, the islanding must be immediately prevented by islanding protection equipment. This paper describes an islanding protection scheme and the digital protection equipment for a synchronous generator. The proposed scheme detects an islanding of a synchronous generator from frequency fluctuation occurred by feeding a sinusoidal small reference voltage signal into the auto voltage regulator circuit of the generator. The authors have manufactured the digital protection equipment applying the scheme, confirmed the excellent performance by testing in an artificial distribution line. In the paper, a determining proceeding of the setting value of the equipment is described.

著者

椎屋 和久 泉田 喜一郎 デルウィシュ サラハ 外山 太郎

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 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)

巻号頁・発行日

vol.123, no.3, pp.511-516, 2003-03-01

参考文献数

11

被引用文献数

2 3

---

This paper is concerned with the calculation of the epipolar line based on the time series images of a moving monocular camera. The purpose of our research is to present a simple method to calculate the epipolar line with sufficient accuracy for matching between the time series images. In this paper we propose an useful method which allows as to calculate the epipolar line by using the compound sensor that combined a monocular camera and an inertial sensor. The inertial sensor gives us the rotation angles and the accelerated velocity vectors of the camera. First, a pair of camera-images is changed into the relation of parallel stereo vision, by the use of the rotation angles. And the baseline between the parallel images is determined by using the rotation data and the acceleration data. Next, the epipolar line of a targeted point is obtained. Moreover, we show the validity of this method which used the combined sensor that can be applied even when a camera carries out movement of 6 degrees of freedom, by the experiment using the camera images and the inertial sensor's data.

著者

岡田 有功

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.130, no.12, 2010-12-01

著者

北川 亘 服部 陽助 藤原 耕二 石原 好之 戸高 敏之

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 = 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.129, no.11, pp.1016-1021, 2009-11-01

参考文献数

5

被引用文献数

2

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This paper describes the preliminary investigation of the database of magnetic properties of magnetic materials to realize the highly accurate magnetic field analysis. By showing the various measured properties, the contents of database, which are possible to be prepared by means of current measurement techniques, were shown.

著者

大島 正明 中村 文則 玉井 伸三 山本 融真 森 治義

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 = 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.120, no.1, pp.104-111, 2000-01

参考文献数

12

被引用文献数

3 1

---

This paper proposes a novel single-phase UPS inverter modulated by Error-Tracking Mode PWM scheme. An ac voltage regulation scheme which matches the PWM scheme is newly developed in a theoretical way. Since Error-tracking Mode PWM is based on constantly-sampled data, the controller is suited to be digitally implemented. The equivalent circuit of the UPS inverter controlled by the schemes is derived. The output impedence is found to be composed mainly of resistance differently from general ac apparatus.<br>According to the newly-developed schemes, a 3kVA, 100V, 50Hz UPS inverter is experimentally fabricated in which the sample period is 10μs and the average switching frequency is 6kHz. No load, linear load and non-linear load characteristics are measured. The output voltage remains almost sinusoidal even for the rated non-linear load. The output impedences are also measured and well agreed with the intended values.