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전자부품 냉각을 위한 Vapor chamber heat sink의 열성능 연구
김윤호(Yoon-Ho Kim),전현수(Hyeon-Soo Jeon),배수호(Soo-Ho Bae),차호진(Hojin Cha),구홍모(Hong-Mo Koo) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
As the electronic devices is more accelerated the compact size, the light-weight and the high integrated trend of electronic components, the most increasingly the heat generation problem rises. Recently, there are growing interests in developing alternative heat sink devices. Vapor chamber heat sinks are heat-spreading systems that develop phase change to spread heat and are of increasing interest in the electronics industry. Vapor chambers are increasingly being investigated as a way to spread the heat generated by an electronic component to the base of a heat sink for typical heat sink applications. In this study, vapor chamber heat sinks have been performed to investigate the thermal performances under the natural convection and forced convection conditions and to compare their performance against copper base heat sink. It is fabricated to be used a real telecommunication equipment specifications. The thermal characteristics of vapor chamber heat sinks are studied according to various input power using dummy heater, test jig and fan. The study shows that vapor chamber heat sinks can thermally perform better than a copper block heat sink. The thermal conductivity of the vapor chamber is also numerically analyzed using CFD simulation and is compared to the experiment results. Thus vapor chamber heat sinks provide good performance alternative to typical heat sinks.
Salmonella typhimurium 에 대한 E-ball 및 상용화된 소독약품의 살균 및 소독 효능에 대한 연구
강신석 ( Shin Seok Kang ),변현섭 ( Hyeon Seop Byeon ),강신권 ( Shin Kwon Kang ),고덕환 ( Duk Hwan Ko ),임대준 ( Dae Jun Lim ),이정화 ( Jung Hwa Lee ),전현수 ( Hyun Soo Jeon ),최진영 ( Jin Yong Choi ),강성호 ( Sung Ho Kang ) 한국동물위생학회 2015 한국동물위생학회지 (KOJVS) Vol.38 No.4
Many chemical disinfectants are using to protect the foot and mouth disease (FMD) and avian influenza (AI) in Korea since 2000. This study was performed to confirm disinfective ability of commercialized chemical disinfectants and to investigate the sterilizing ability of E-ball as alterative to chemical disinfectants. 4 kinds of acidulant, 3 kinds of aldehyde, 1 kind of oxidizer and 300 g of E-ball were used in this study. Dilution rate of disinfective power of all chemical disinfectants were to 200 times. The sterilizing ability of aldehydes were better than the acidulant and oxidizer with Salmonella typhimurium. The sterilizing ability of E-ball treated solution was guessed due to the friction of E-ball deads. In the case of the friction of 2 beads of E-ball, Salmonella typhimurium was sterilizted on 1×106/mL CFU in the E-ball treated solution. The E-ball treated solution had superior sterizing power compared with the chemical disinfectants in the bacteria of soil for antibacterial examination. E-ball treated solution has a possibility as the substitute of chemical disinfectants to protective the animal diseases contains FMD, AI.