IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
Volume 132, Issue 12
Displaying 1-24 of 24 articles from this issue
Special Issue on Frontier of Education in Electrical and Electronics Engineering
Special Issue Paper
  • Satoru Honma, Hidetoshi Wakamatsu, Nobue Sakai, Kyouko Arakawa, Takayu ...
    2012 Volume 132 Issue 12 Pages 1079-1085
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    A study of concerning medical qualification is prepared by relevant institutions for the examination of medical technologist so that the students might obtain the license on time of their school schedule. However, the instructors do not have enough time to give them extra lessons. Thus, we have ever developed the Web-learning system of medical engineering, so that the students might study it by themselves at their convenient time. We discussed its learning effect on the basis of experimental results presented at the lecture and practice. The students evaluated by themselves that it was a practical method for understanding important points of the concerning subjects. The system readily ensures them to study and get better showing of it. Hereby, some students successfully used the system, but were rather reluctant to it, because they could obtain little record by its use. Thus, we tried to know the learning process of the students in order to find its effective use by the questionnaires about their attitude to the self-learning on their compensatory use of the present system.
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  • Hiroharu Kawasaki, Yoshiaki Suda, Hiroshi Nishiguchi, Yoshihito Yagyu, ...
    2012 Volume 132 Issue 12 Pages 1086-1091
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    International cooperative work has been paid much attention in the industry, because once they can combine European and American innovative ideas, Japanese advanced technology, and Chinese manufacturing capacity together, they can produce high quality products with less cost. Therefore, many Japanese companies have concluded cooperative research agreements with European and American companies, and have made inroads into foreign countries such as China, Korea, India, and East European countries, with many Japanese factories already operating there. Under such circumstances, it is likely that these companies need young Japanese engineers who can play an active part in the factory or research center in the foreign countries, as well as young foreign engineers who can understand the view of Japanese companies, including their goals and policies. Sasebo National College of Technology (SNCT) in Japan started a mutual exchange internship program in 2005 in partnership with Xiamen University of Technology (XUT) in China. By deepening mutual understanding between Japan and China through this program, young Japanese and Chinese engineers can work toward their common goal of economic prosperity in their respective countries, while building partnerships based on mutual trust and respect. Then, in 2009, SNCT started the next program with broad scopes including Korean and Swedish universities. This new program aims to educate and train young Japanese engineers who can apply their knowledge and skills fully to their work in the factories in foreign countries, not only China but also other countries. At the same time, the new program also aims to educate and train young engineers who will acquire not only technological knowledge and skills but also an understanding of the organizational structure and cultural background of global companies.
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  • Mikio Deguchi, Akimitsu Hatta
    2012 Volume 132 Issue 12 Pages 1092-1099
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    At upper secondary schools, students learn the formula that represents the electrostatic energy stored in a capacitor. However, it is not generally easy to do experiments to validate the formula in classroom hours. We have developed a power meter that can measure the output power of a hand generator. This power meter can calculate the total energy that passed through it. Using this function, we can measure the energy stored in a capacitor without any additional apparatus. It is very significant for the education related to “energy” that the amount of the energy can be directly measured. Leaning from experiments is effective to understand the electrostatic energy stored in capacitor, which has been verified by lesson practices in a college of technology. From the experiments, students can also learn that the energy loss is inevitable in energy conversion process, that errors actually occur in the measurements, and that the actual capacitor has a series resistance and is different from the ideal circuit model of a capacitor.
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  • Chikako Miyamoto, Mika Nakano
    2012 Volume 132 Issue 12 Pages 1100-1105
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    What can we teachers do to foster students' initiative? Searching for an answer to this question, this paper analyzes the students' self-monitoring in presentation education. “Presentation” is the required subjects for sophomore students among a series of communication programs started in department of Electrical Engineering, Fukuoka Institute of Technology in 2007. In the class, students learn not only presentation skills such as making slides, but also collaboration skills in a group to create something trough the creation of documents and the presentations. To facilitate presentation learning, we found that how they self-monitor themselves while doing several tasks and group activities is one of the key factors to ensure their improvement. The result of questionnaire shows the difference between the students who well manage self-monitoring and the students who don't. By discussing the result of students' self-monitoring, we can identify a new approach to presentation education.
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  • —Parallel-Repeated Learning of Communication and Management—
    Mika Nakano
    2012 Volume 132 Issue 12 Pages 1106-1111
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    This paper describes the method of presentation education to foster practical communication skills of the students as career support and the test the effects. The education started as new courses for communication skills in the Electrical Engineering majors Fukuoka Institute of Technology in 2007. To maximize the effect of the presentation education regardless of students' motivations and abilities, the elements which needs to be included in the subject can be summarized as follows: (A) “knowledge phase” to acquire knowledge on the theme, (B) “presentation phase” to acquire skills of creating materials and oral presentation, (C) “management phase” to acquire management skills necessary for complete tasks. The program was designed for students to learn (B) and (C) in parallel in the domain of (A) based on Basic Skills as a criteria of self-evaluation, which repeats twice in one semester. The results indicate that the time when the students notice their problem and improvement differs in the items of Basic Skills. One time practice is not enough to reflect themselves and change their behavior in presentation education.
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  • Tomomi Yasuda, Akihiro Yamada, Takeshi Tanaka
    2012 Volume 132 Issue 12 Pages 1112-1117
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    LSI systems are used at all places in modern society. A number of different technologies are used to produce LSI systems, therefore it becomes difficult to understand these systems. The education which was consistent from an integrated circuit (IC) design to a printed circuit board mounting was mainly attained at universities and graduate schools. In this study, the training for understanding IC stacked structure and layout design was conducted on the education of a senior high school. Exclusive CAD software for LSI design, α-SX was used to IC layout design. Each Student had designed an inverter and a NAND circuit. They had designed a full adder circuit in a group. Then with public development equipment, IC chips were actually manufactured along with this layout design. Bare chips were observed with scanning electron microscope (SEM). SEM and Energy Dispersive x-ray Spectroscopy (EDX) analysis were effective to deeply understand between stacked structures and material characteristics of an IC. This project was taken as a cooperation education of a high school and a university. We showed the possibility to take in an integrated circuit structure education to one of the training subjects in a senior high school.
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Special Issue Letter
Paper
  • Haruhiko Numajiri, Masashi Sasaki, Takao Aikawa, Hiroyasu Sato, Kazuhi ...
    2012 Volume 132 Issue 12 Pages 1126-1131
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    Using a small-type crucible, the inter-laboratory comparison of the realization of the Co-C eutectic point was executed in the industrial field in Japan, with the aim to verify the possibility of thermocouple calibration at the eutectic point with an existing furnace of not so good temperature distribution: the palladium-point wire-bridge method furnace for thermocouple calibration. A small-type crucible for thermocouples was made by the National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ/AIST). The inter-laboratory comparison was piloted by the Tokyo Metropolitan Industrial Technology Research Institute (TIRI), a public test and research organization in Tokyo, and was conducted among five calibration laboratories including the pilot. One of the five laboratories is a designated calibration laboratory in Japan, and the three remainders are private laboratories. Four laboratories including TIRI used existing palladium-point furnace, and one laboratory made a new furnace for this inter-laboratory comparison.
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  • Toshihiro Tsuda, Shinichiro Yamada, Hirotsugu Tsutsui, Takayuki Sakura ...
    2012 Volume 132 Issue 12 Pages 1132-1139
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    This paper discusses the lifetime evaluation of twisted pairs which was constructed by a surge proof magnet wire. Two kinds of twisted pairs were constructed; one is a conventional twisted pairs and the other is a special twisted pairs which has varnish treatment at both edge sides of it. The both lifetime characteristics were evaluated and the breakdown positions were also investigated. As a result, it was found that the lifetime of the edge parts of usual twisted pairs was about 50% shorter than that of the other positions. It was estimated that the partial discharge activity at the edge part is stronger than that at the other positions, by an ultraviolet light measurement or others. This paper also describes a concept and quality control method for the inverter fed random wound motor which was manufactured by using a surge proof magnet wire.
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  • Yuichi Takai, Yuhki Naganuma, Sho Takayanagi, Toru Sasaki, Takashi Kik ...
    2012 Volume 132 Issue 12 Pages 1140-1145
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    An effect of cross-section in electrodes on thrust efficiency has been studied by using an MHD accelerator, which consists of a pulsed-power system, an MHD acceleration channel, a permanent magnet, diagnostic systems, and a model rocket engine. In order to estimate the thrust efficiency, temperature and velocity of combustion gas were measured by fitting the radiation temperature assuming blackbody and time-of-flight method. The results indicated that the thrust efficiency of the pulsed-MHD accelerator is improved when the cross-section of electrodes is decreased. Because of the higher current density generates the stronger electromagnetic force for the smaller electrode.
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  • Chaichan Pothisarn, Ryu-ichiro Ohyama
    2012 Volume 132 Issue 12 Pages 1146-1150
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    A narrow ionic wind device is investigated in this experiment, in order to aim at the application to a micro electrohydrodynamic (EHD) gas pump with a needle-ring electrode system, operating without mechanical parts. The EHD pump consists of a needle electrode attached with a tapered glass tube, where the grounded ring electrode is located on outer surface. Under AC dielectric barrier discharge condition, the ionic wind is generated inside the tapered glass tube as a micro gas pump. The distribution of ionic wind velocity under AC corona discharges is analyzed by using particle image velocimetry (PIV). Ionic wind flow rate and energy efficiency are presented as a function of the corona discharge current or the electric power. The energy efficiency of ionic wind is discussed in terms of an EHD non-dimensional analysis for the corona discharge current.
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  • Tatsuo Takada, Tomoyuki Ishii, Yohei Komiyama, Hiroaki Miyake, Yasuhir ...
    2012 Volume 132 Issue 12 Pages 1151-1159
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    The hetero charge accumulated in Polyimide film, which was increased with increasing applied electric field, was observed by PEA equipment. In order to explain the mechanism of hetero charge accumulation depending on electric field, we proposed a new model combined Fermi-Dirac function (the electron-hole pair generation probability between band gap (about 2.5eV) of HOMO and LUMO under thermally equilibrium condition, which was obtained by Quantum Chemical Calculation) and Pool-Frenkel effect (the electron-hole pair generating probability affected by local electric field). In the process of electric charge transfer, the electron carrier is stayed at deep trap site (the molecular part of one benzene ring with imide groups) and the hole carrier is able to drift between shallow trap sites (the molecular part of ether bond between two benzene rings). From the different transfer properties between electron and hole, we could explain the mechanism of hetero charge accumulation in Polyimide film under high electric stress.
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  • Akiyoshi Nagata, Takuto Yoshida
    2012 Volume 132 Issue 12 Pages 1160-1165
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    Performance of a novel single chamber fuel cell (SCFC) using an inorganic proton conductor was studied to electric characteristic at catalytic electrodes and operating temperatures in dry gas mixtures of hydrogen and oxygen. The inorganic proton conductor of SCFC was prepared by the sol-gel method using the boehmite (AlO(OH)) material. The open-circuit voltage (OCV) of single cell achieved a maximum of 730mV in the dry gas mixtures of H2/O2=50% at room-temperature operation so that the impedance values of the single cell became lower when using the sputtered Pt as outer electrode and Pt paste as inner electrode. This OCV value corresponds to about theoretical electromotive force. The operating temperature of single cell could improve to 60°C by performing heat treatment of boehmite film covered with a nafion dispersion solution. Moreover, the power and current densities of single cell increased to 1.1mW/cm2 and 7.64mA/cm2 by making thin boehmite film of 3μm. As a result, the SCFC using the boehmite electrolyte prepared by sol-gel method were found to achieve the cell performance of high-energy density at higher operating temperatures in the dry gas mixtures such that it used as the portable electrochemical generator.
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Letter
  • Yukio Ohta, Takehito Hayami, Atsuo Murata
    2012 Volume 132 Issue 12 Pages 1166-1167
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    In spite of mastering scientific knowledge and formula necessary for the solution, we sometimes encounter a situation where we cannot reach the correct answer. The reason must be contributed to the lack in metacognitive abilities. Participants were required to solve two problems on basic electric circuit. The solution process was divided into (a) comprehension, (b) plan of solution, and (c) execution. At the plan process, statistically significant differences were detected between the high and low score groups. The importance of metacognitive ability, especially the plan ability was identified.
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  • Fumiaki Fukawa, Susumu Suzuki, Haruo Itoh
    2012 Volume 132 Issue 12 Pages 1168-1169
    Published: December 01, 2012
    Released on J-STAGE: December 01, 2012
    JOURNAL FREE ACCESS
    While dielectric barrier discharge (DBD) is used for practical ozone generator, various type of discharge plasma has been also studied to accomplish higher ozone generation yield and ozone concentration. This paper describes the results of experimental investigation on the ozone generation characteristics using a DBD type ozone generator driven by a Blumlein type pulse forming network (B-PFN) as a power source. The reactor is equipped with a concentric cylinder electrode. This combined ozone generation method gives maximum ozone concentration of about 57g/Nm3 and maximum generation yield of about 640g/kWh. These results are compared with other results using pulsed power discharges.
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