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김봉기(Kim, Bong-Ki),김상렬(Kim, Sang-Ryul),김현실(Kim, Hyun-Sil),신민철(Shin, Min-Chol) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.12
A muffler design in the exhaust system is critical to provide fur low noise in shipboard spaces. In an attempt to effectively design the low noise muffler, it Is important to evaluate the performance of the muffler considering not only the noise, but also pressure drop as well. For this purpose, a test system of large exhaust mufflers fur ship propulsion systems was designed based on ISO 7235. The substitution test fur determining both the insertion loss and pressure drop of mufflers was carried out. A ship exhaust muffler is considered as a test example and the insertion loss and pressure drop were obtained.
Diarylethene이 첨가된 저융점 유-무기 하이브리드 유리의 광변색 특성
김지경,김명정,박성제,류봉기,Kim, Ji-Kyung,Kim, Myeong-Jeong,Park, Sung-Je,Ryu, Bong-Ki 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.1
Diarylethene in photochromic materials was doped in organic-inorganic hybrid low-melting glasses were synthesized through a nonaqueous acid-base reaction process, which consists of network units including a small number of bridging oxides. The organic phase is a dichlorodimethylsilane while the inorganic phase is a tin(II) chloride. Diarylethene was incorporated into the glasses without any degradation of its functionality. The open form of diarylenthene, which is converted from the opening one upon UV-irradiation, is change to the closed form visible light-irradiation. The rate constant of the photochemical reaction is $31.78\times10^{-3}s^{-1}$ with 400 W UV lamp irradiation.