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RISC의 파이프 라인 인터록을 위한 코드 스케쥴링 알고리즘
박기호(K.H Park),박종득(J.D Park),김은성(E S Kim),임인칠(I C Lim) 한국정보과학회 1988 한국정보과학회 학술발표논문집 Vol.15 No.1
파이프라인 아키텍처 상에서 일정한 사이클 타임을 가지는 RISC 명령어들 간에 데이타 종속 관계가 존재하고 있는 경우에는 타이밍 해저드가 발생하게 되며 인터록 메카니즘으로 인하여 파이프라인 시스템의 성능 저하를 초래하게 되고, 하드웨어가 복잡해 진다. 따라서 컴파일 시에 각 명령어들의 데이타 종속 관계를 고려하여 명령어 시퀀스를 재배열 함으로써 타이밍 해저드를 해결하고, 인터록을 제거하여 건제수행 사이클 타임을 감소시킨다. 본 논문에서는 명령어들 간의 데이타 종속 관계를 고려하여 코드 스케쥴링 함으로써 타이밍 해저드를 해결하고, 전제 수행 사이클 타임을 감소시킬 수 있는 데이타 종속 코드 스케쥴링 알고리즘을 제안한다.
VCHP에서 불응축 가스량이 열전달 성능에 미치는 영향에 관한 실험적 연구
박기호(K. H. Park),이기우(K. W. Lee),이욱현(W. H. Lee),이계중(K. J. Lee),서정세(J-S. Suh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This paper is to research the heat transfer characteristic in copper-water variable<br/> conductance heat pipes(VCHP) with a non-condensable gas and gas reservoir. The heat transfer<br/> characteristics in the VCHP have not yet been studied much researches. VCHP are used in<br/> many applications. These applications range from thermal control of components and systems on<br/> satellites, to precise temperature calibration duties, conventional electronics temperature control<br/> and thermal diodes. The practical use of VCHP is a simple way to control the temperature of<br/> satellites. As the quantity of NCG was increased, there was an increase in the saturation vapor<br/> temperatures. As the input heat has loaded from 90 W to 110 W, the difference of the<br/> evaporator surface is lower than 10°C.
다공성소결윅구조에 따른 루프 히트파이프에서 압력손실의 이론적 분석
이기우(K. W. Lee),이욱현(W. H. Lee),박기호(K. H. Park),이계중(K. J. Lee),전원표(W. P. Chun),인현만(H. M. Ihn) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In this paper, the pressure drops were investigated according to the sintered porous wick structure in loop heat pipe(LHP) by theoretical analysis. LHP has the wick only in evaporator for the circulation of working fluid, so utilizes porous wick structure which pore diameter is very small for large capillary force. This paper investigates the effects of different parameters on the pressure drops of the LHP such as particle daimeter of sintered porous wick, wick porosity, vapor line diameter, thickness of wick and heating capacity. Working fluid is water and the material of sintered porous wick is copper. According to the these different parameters, capillary pressure, pressure drop in wick were analized by theoretical design method of LHP.
Mesh Wick형 가변전열 히트파이프의 열전달 성능에 관한 실험적 연구
박영식(Y.S. Park),변길성(G.S. Byon),서정세(J.S. Suh),박기호(K.H. Park),이기우(K.W. Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Analysis and experiment are performed to investigate the thermal performance of a<br/> heat pipe with screen meshed wick. The heat pipe was designed in 200 screen meshs, 500 mm<br/> length and 12mm O.D tube of copper, water as working fluid and nitrogen as non-condensible gas.<br/> Heat pipe used in this study has evaporator, condenser and adiabatic section, respectively.<br/> Experimental data of wall temperature distribution along axial length is presented for heat transport<br/> capacity, condensor cooling water temperature change, degrees of an inclination angle, and operating<br/> temperature.
박영식(Y.S.Park),김동언(D.E.Kim),변길성(G.S.Byon),서정세(J.-S.Suh),이기우(K.-W.Lee),박기호(K.H.Park) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The present study has been conducted to analytically investigate the thermal control performance of variable conductance heat pipe(VCHP) with axial grooves. The condenser por of the VCHP is occupied by a inert gas in which the concentration of gas is varied with the operation temperature due to the variation of inert gas concentration. In this study, numerical evaluation for the thermal control of the VCHP with axial grooves is made from the 1st order diffusion model that considers the diffusive expansion of inert gas by concentration gradient. Ammonia is used as a working fluid and Nitrogen as a control gas in the Aluminum tube. As a result, the thermal performance of VCHP based on diffusion model has been compared with that of VCHP from flat front model. Additionally, it is found that the concentration of inert gas is distributed in the condenser region of VCHP with axial grooves.
스크린 메쉬형 가변전열 히트파이프에서 NCG양에 따른 작동특성 변화
서정세(J.S. Suh),박영식(Y.S. Park),강창호(C.H. Kang),정경택(K.T. Chung),박기호(K.H. Park),이기우(K.W. Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Experimental study is performed to investigate the effect of heat load and operating temperature on the thermal performance of a heat pipe with screen mesh wick. The heat pipe was designed in 200 screen meshes, 500㎜ length and 12.7㎜ O.D tube of copper, water as working fluid(4.8g) and nitrogen as non-condensible gas(NCG). The heat pipe used in this study has evaporator, condenser and adiabatic section, respectively. Experimental data of axial wall temperature distribution is presented for heat transport capacity, the temperature of cooling water of condenser, inclination angle, and operating temperature. For the results from this study, it is found that, for the same charging mass of working fluid, the initial operating temperature and the overall wall temperatures of heat pipe are higher for NCG charging mass of 5.0×10??㎏ and 3.4×10??㎏, than that of 1.0×10??㎏.