• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.537-539
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• 2011

최근의 차량 연비는 엔진, 파워트레인 등 차량의 구성품들을 성능 개선하여 많이 향상 되었으나 연비 측정은 현재도 주어진 모드(LA-4, FTP-75 등)에서 컴퓨터 모의시험 및 다이나모에서 수행한다. 본 논문에서는 차량에 미리 장착된 지리정보데이터와 현재 주행하면서 수신되는 GPS 데이터를 이용하여 약 213Km 영동고속도로를 주행하면서 실제 도로의 연비 향상 방안을 도출한다. 지리정보데이터와 주행하면서 수신한 GPS 데이터 중에서 거리와 고도 데이터를 추출하여 각 구간의 경사도, 주행저항을 계산, 연비향상 알고리즘에 따른 속도 프로파일을 영동고속도로 전 구간에 대해서 완성하고 이 속도 프로파일로 컴퓨터를 이용한 AVL사의 CRUISE 프로그램으로 모의 주행하여 연비를 산출하고 연비 향상 방안을 제안한다.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.494-495
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• 2006

개폐기, 차단기와 같은 스위치기어들은 지중케이블이나 가공선로, 콘덴서 뱅크에 흐르는 진상 전류의 개폐를 많이 하게 된다. 이때 진상전류의 크기는 정격 차단전류나 부하전류보다 그 크기가 매우 작다. 그러나 스위치기어 측면에서는 전압을 고려하였을 때 가혹한 시험이며, 이는 차단 후 극간에 걸리는 과도한 회복전압에 기인한다. 본 논문에서는 국제규격에서 요구하는 진상전류 시험의 회로조건들을, 회복전압 측면에 바탕을 두고 고찰해 보았다.

• Proceedings of the Korea Association of Crystal Growth Conference
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• 1998.06a
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• pp.121-125
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• 1998

Langasite is a new piezoelectric material which is similar to quartz in its acoustic behaviours. In this study, pure Langasite and Langasite family grouo powders were synthesized by the solid state reaction in air. And then diffusion of synthesized powders were controlled by B and C ions in the{{{{ { A}_{ 3} { B}_{5} { CD}_{ 14 }}}}} structure. Dielectric constant and lattice anisotripy of Langasite and family group were measured to be 17, 22~27 in the range of 1 kHz to 13 MHz and about 1.6. respectively.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.89-90
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• 2006

무선센서 네트워크 기술은 최근 주목 받고 있는 유비쿼터스 컴퓨팅의 핵심 분야로서, 그 활용도가 다양해서 이와 관련된 많은 연구 개발이 이루어지고 있다. 본 논문에서는 무선 센서 네트워크 기술을 여러 응용 분야에 활용될 수 있는 환경 정보 모니터링 시스템에 적용시켜 보았다. 센서 노드로써 MicaZ와 그 운영체제인 TinyOS를 이용하여 온도, 조도, 습도, 가속도, 그리고 위치 등의 사용자 환경 정보를 탐지하고 처리하는 시스템을 구현하여 사용자가 원하는 환경의 조건을 유지하는데 이용될 수 있도록 하였다.

• The Korea Journal of Herbology
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• v.20 no.2
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• pp.1-6
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• 2005

Objectives : The purpose of this study is to investigate genetic toxicity of Cervi pantotrichum Cornu herbal acupuncture solution(CPCHA). Methods : In this study, a series of investigation have been carried out to analyze the effects of Cervi pantotrichum Cornu herball acupuncture solution(CPCHA) on colony forming ability of NIH3T3cells, Hela cells and adrenorectal coloncell for genetic toxicity test. Results and Conclusions : From the above results, it is suggested that Cervi pantotrichum Cornu herball acupuncture solution(CPCHA) was limited 0.5-10ug/ml by test. Cervi pantotrichum Cornu herball acupuncture solution(CPCHA) did not exert the protective role to the genetic toxicity in kinds of cell lines used in this study. From these results, Cervi pantotrichum Cornu herbal aqua-acupuncture solution needs further study to prove it's function in cell culture system.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.06a
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• pp.321-325
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• 2005

These days, it is needed that more stability and reliability of Diesel engine. So it is essential that a systematic and comprehensive fault diagnosis analysis technology. this technology makes fault diagnosis analysis system more efficient. Expert System is required to make fault diagnosis analysis system. In this paper, fault and early diagnosis system is implemented to use Expert System development tools.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.106-108
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• 2002

Capacitive current switching test for circuit breaker and load breaker switch requires special attention because, after current interruption, the capacitive load contains an electrical charge and can cause dielectric restrike and re-ignition of the switching devices. therefore dielectric strength of capacitor load bank shall be able to withstand 4Vt (Vt : test voltage) and charging voltage discharged within 1 min. In this paper presents both characteristic of capacitive current switching tests and design of capacitor load bank.

• Proceedings of the KIEE Conference
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• 1987.11a
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• pp.213-215
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• 1987

In this paper, influences or grain size on the electro-optic properties were studied on the penferroelectric PLZT ceramics. The specimens were fabricated by the two stage sintering method. Relative permittivity was a little increased with the increment or grain size in 9,9.5/65/35 (La/Zr/Ti) PLZT specimens, and Curie temperature was decreased in the 9.5/65/35 specimens but constant in the 9.5/65/35 specimens. As the grain size was increased, field induced polarization and dP/dE were increased. Because domain walls can be easily moved by electric field. Light transmittance was increased in the 9/65/35 PLZT specimens but there was little effect on the grain size in the 9.5/65/35 PLZT specimens.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.695-696
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• 2006

The inrush current of transformer cause saturation effects of recovery voltage for short-circuit power testing. the inrush current depends on the residual flux of the transformer core. when inrush current occurs, it is contains a d.c. component and the high harmonic content of the current are of importance to relay protection of testing circuit. this paper describes of decrease method of inrush current for high power short-circuit testing transformer.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.685-686
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• 2006

The excitation system of 500MVA short-circuit generator is very important because of operation of various condition, for example, (over) load switching, short-time current, short-circuit current, etc. This paper introduces a feature of excitation system of 500MVA short-circuit facilities and the function and construction of each part.