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히트파이프형 이중진공관 태양열집열기의 배열 방식에 따른 열특성의 실험적 연구
정경택(Chung Kyung-Taek),김병기(Kim Byoung-Gi),장환영(Jang Hwan-Young),서정세(Suh Jeong-Se) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
The thermal performance of solar systems for hot water service usually depends on the solar collectors. Evacuated tube solar collector with heat pipe has been developed to improve the thermal efficiency of solar energy collector. In solar energy system, collector modules should be arranged in series and/or parallel pattern. The experiment is carried out to investigate the thermal performance for the module of solar collector in series and parallel, respectively. The results from this study will be presented as the basic data for the arranging pattern of many solar collectors.
VS/VD 구조의 퍼지 기반 ABR 트래픽 제어에 관한 연구
박현,정광일,정명수,정경택,전병실,Park, Hyun,Jeong, Kwang-Il,Cheong, Myung-Soo,Chung, Kyung-Taek,Chon, Byoung-Sil 대한전자공학회 2002 電子工學會論文誌-TC (Telecommunications) Vol.39 No.8
본 논문에서는 퍼지이론을 기반으로하여 ATM망에서 ABR 서비스를 하는데 있어서 효과적으로 링크를 이용하기 위한 트래픽 제어 알고리즘을 제안하였다. 제안한 알고리즘은 스위치의 버퍼 사이즈에 따라서 소스 전송률을 제어하고 퍼지율을 이용하여 입력 셀 율을 제어하는 알고리즘이다. 우리는 위의 방법들로 퍼지트래픽 제어 알고리즘과 VS/VD의 ER값을 기본으로 한 퍼지 트래픽 제어기를 개발하였다. 또한 퍼지 제어규칙, max-min inferencing 방법으로 하나의 집합적인 기능을 설계하였다. In this paper, we propose an traffic control algorithm for efficient link utilization of ATM-ABR service based on fuzzy logic. The proposed algorithm, controls transmission rates of source according to switch buffer size and input cell tate by using the fuzzy rate . For this method we developed a model and algorithm of fuzzy traffic control method and fuzzy traffic controller which based on ER of VS/VD. For the fuzzy traffic controller, we also designed a membership function, fuzzy control rules, and a max-min inferencing method.
스크린메쉬형 VCHP에서 NCG량에 따른 열전달 성능실험
박영식(Young-Sik park),정경택(Kyung-Taek Chung),서정세(Jeong-Se Suh) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.10
Experimental study has been performed to investigate the influence of non¬condensible gas(NCG) charged mass on the thermal performance of a variable conductance heat pipe(VCHP) with screen mesh wick. The VCHP is furnished by screen mesh number 200 for the pipe outer diameter of 12.7 ㎜ and the pipe length of 500 ㎜, The VCHP is filled with water as working fluid of 4.8 g and nitrogen as NCG and has evaporator, condenser and adiabatic section, respectively. For the results from experiment, it is found that, for the same charged mass of working fluid, the overall wall temperatures of heat pipe grows up with increasing NCG charged mass. The variation of operating temperature of VCHP reduces with increasing NCG mass. In addition, the profile of axial wall temperature distribution is presented for heat transport capacity of heat pipe, the temperature of cooling water of condenser, inclination angle, and operating temperature.