• Journal of Power Electronics
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• v.9 no.2
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• pp.243-258
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• 2009

Bearingless centrifugal pump systems are employed in the semiconductor, pharmaceutical and medical industries due to their facility for pumping high purity fluids without particle contamination. Two types of forces have to be generated by the stator units, namely bearing forces for achieving magnetic levitation, and drive forces for producing the needed pump torque. The generation of these forces requires bearing and drive windings, which can be realized as separate bearing and drive coils or as identical, combined coils on the stator claws. In this paper, a detailed comparison between these two winding concepts is undertaken, whereby the copper losses, the power electronics losses, and the achievable pump output pressure are evaluated for both concepts. For each criterion a ratio of improvement is calculated analytically which allows evaluation of the performance of the two winding concepts for any given pump operating point and design. Finally, also practical features such as control complexity, cabling effort and manufacturability are discussed and measurements on prototype systems are carried out to validate the considerations.

• Journal of Power Electronics
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• v.9 no.2
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• pp.180-187
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• 2009

When converters operate in megahertz range, the passive components and magnetic devices generate high losses. However, the eddy current issues and choices of magnetic cores significantly affect on the design stage. Apart from that, the components' reduction, miniaturization technique and frequency scaling are required as well as improvement in thermal capability, integration technique, circuit topologies and PCB layout optimization. In transformer design, the winding and core losses give great attention to the design stage. From simulation work, it is found that E-25066 material manufactured by AVX could be the most suitable core for high frequency transformer design. By employing planar geometry topology, the material can generate significant power loss savings of more than 67% compared to other materials studied in this work. Furthermore, young researchers can use this information to develop new approaches based on concepts, issues and methodology in the design of magnetic components for high frequency applications.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.45 no.3
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• pp.80-85
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• 2008

Capsule endoscopes generally use primary cells as a power source due to its limited space. However, the primary cells have several limitations such as high cost, limited power and no reuse. To solve these problems, a new wireless energy transmission method is proposed. The proposed approach uses air-gap transformer concepts and LC resonance to transmit energy from transmitter(primary side) to capsule endoscopes(secondary side). The ferrite core with 3-axis winding is used to increase energy transfer efficiency regardless of direction and location. The experimental results show that the proposed method stably supplies 30mW power to secondary circuit.

• The Research Journal of the Costume Culture
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• v.13 no.4 s.57
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• pp.622-631
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• 2005

The purpose of this study is to know variety winding ways for scarf and to know the trends of scarf expression methods with seeing how to affect these ways on recent fashion. Investigating for scarf's concept and feature through theory records and looking for variety scarf expression ways were done for this study. And then The photo data of fashion magazines from s/s 2000 to s/s 2005, focusing on the divided scarf expressions, were analyzed. The frequencies of scarf expression are like this; decorating on the neck($60\%$), decoration on the shoulders($18\%$), decorating on the head($10\%$), etc($9\%$), using for accessaries($3\%$). Decorating on the necks is shown lasting ways. Also recently the methods breaking the established concepts - the mixing with two ways and the pratical using scarf' as a part of clothes - have a tendency to increase steady.

• Journal of the Daesoon Academy of Sciences
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• v.18
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• pp.81-99
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• 2004

This text discusses trends in the construction of religions since the Meiji Era, using Konkokyo and Restoration Shintoism as examples. The construction of religions is applied here as the process of a deliberate acceptace of religious images as a discourse of "Civilization" endowed with "kyougi" or "Doctrine" and "kyousoku" or "Rules of Instruction." Winding through a meandering path, these constructed religions do not take precedence over "Jikyou" or "State Religion." Yet, "Jikyou" for a while was fixed in its own fragemented self-imagery. As for Shinto, in 1900, the Office of Shinto Shrines became independent from the Office of Shrines and Temples in the Department of Domestic Affairs, and clearly Shinto and Shinto Shrines were part of secular state ideology. In the Bakumatsu and Meiji Periods, it ultimately was cut off from Restoration Shinto, thereby achieving this development on its own. This tells of the formation of an entirely new and modern Shinto within a secular "Jikyou." Konkokyo, moreover, as a religion establishes "kyousoku" and "kyougi." As a Shinto sect, it takes steps on the path toward recognizing a self-identity, namely as religious Shinto. As a result, dogmatization and systemization progress, and "Byoukinaoshi" or "illness-recovery" from the Tokugawa Period weathers. Also, as for progress in the Shinto religious order, from its foundation, the characteristics of a unified state and religion emerge, and thus there is an acceptance of significant restrictions. This dillema continues to persist as a problem in postwar Japan. Shedding light on Tokugawa Era practice also sheds light on where we can now take religious concepts.