• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2001.02a
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• pp.95-97
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• 2001

This paper deals with cryogen, which is used solid nitrogen to keep the operating temperature of High Temperature Superconducting (HTS) synchronous machine. To make the solid nitrogen of liquid nitrogen, liquid helium (LHe) passes into and cools the heat exchanger to its own temperature. Two types of heat exchangers are designed and manufactured to make the solid nitrogen, and temperature characteristics of those compare with each other. The rotor cooled by latent heat of solid nitrogen and it is kept under 40K during 2 hours and 30 minutes without LHe.

• Proceedings of the Korean Society of Crop Science Conference
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• 2006.04a
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• pp.530-531
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• 2006

• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.1974-1977
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• 1997

오늘날 철강 냉간압연의 응용분야에서는 고성능의 장력제어와 높은 신뢰도, 역률 개선, 공장의 생산성 향상 등을 요구하고 있다. 기존의 직류전동기를 대체하는 가변속 교류전동기 구동시스템과 고주파 PWM, 그리고 높은 역률을 보장하는 PWM 컨버터에 의해 이러한 요구사항들은 만족될 수 있다. 이 논문에서는 위에서 언급된 제어요건을 보장하는 철강 생산 설비용 1MVA급 압연시스템을 설명한다. 본 시스템은 하나의 ac/dc PWM 컨버터와 각각 700kw 유도전동기를 구동하는 두대의 PWM 인버터로 구성되어 있다. 제어 알고리듬은 TMS320C40 디지탈 신호처리 프로세서(이하 DSP) 시스템을 이용하여 구현하였다.

• Tribology and Lubricants
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• v.5 no.1
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• pp.51-56
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• 1989

The Lubricational characteristics of O/W Emulsions of beef tallow and mineral oil based lubricants are studied in a roller on disk apparatus. It is revealed that the coefficients of friction with both emulsion lubricants exhibit essentially similar behavior; that is, they rapidly decrease to 0.1% concentration and after they constants with increasing oil concentration, and that, with oil in water emulsions of a concentrations as low as 5wt% practically forms a elastohydrodynamic film. One hand, surface temperature effect on lubricants has virtually no severe, and that, the minimum EHL film chickness estimated that it begins to increase at a concentration of several percent; the effect of particle diameter becomes maked there after.

• 대한두경부종양학회:학술대회논문집
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• 2007.11a
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• pp.210-210
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• 2007

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.302.1-302.1
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• 2003

Accelerated stability testing was performed on the different 7 dosage forms in order to evaluate the influences of the existence of other vitamins, minerals, excipients on the chemical stability of vitamin A in complicated vitamin drug products. The stability results suggested that increasing of storage time and temperature has resulted in increasing the rate of vitamin A decomposition and the shelf lives(t$\sub$90/) under the test decreased as the storage temperature increased. (omitted)

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.125-128
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• 2008

In this paper, the Transport Protocol Experts Group(TPEG) transmission and reception system based on Digital Radio Mondiale(DRM) is implemented for traffic information services. DRM stands for the European radio broadcasting standard to bring AM radio into digital radio, designed to work at frequencies below 30MHz. DRM can offer various data services such as text messages and a slide show service as well as audio services. In spite of low datarate, the TPEG system on DRM has an advantage that the traffic information service system for whole country can be established because DRM can offer wider service ranges than terrestrial-digital multimedia broadcasting(T-DMB) and simply archive a single frequency network.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1261-1263
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• 2002

In the aspect of economy and safety, it is essential to the decision of H-beam suitable for the condition of environment, installation, track etc. This paper presents a development of automatic design program to decide the size of H-beam according to the input condition.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1258-1260
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• 2002

This paper presents a fitting algorithm for automatic design of cantilever. Through this algorithm, CaLeCa which is automatic calculation software of cantilrver fitting is developed.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.789-792
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• 2005

In this paper, we propose a method that applies pipeline architecture to parallel CRC circuits. We developed a logic partitioning algorithm for applying pipeline architecture. Our algorithm can be used for the polynomial and the input data width, both of arbitrary length and minimize the logic level. Design experiments show the superiority of our approach in reducing the delay in comparison with previous works.