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초친수 나노코팅을 적용한 복합태양광 발전시스템 성능평가
천경호(Cheon. Kyeong Ho),채규정(Chae. Kyu Jung),김동수(Kim. Dong Soo),김성태(Kim. SungTae),안영섭(An Young Su) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.11
This study was conducted to evaluate the performance of solar energy production system by adopting super hydrophilic nano-coating agent for improving energy self-sufficiency in municipal wastewater treatment plants(WWTPs). SKT3 and SKG was tested as super hydrophilic nano-coating agent. As the results, the power generation efficiency was increased by super hydrophilic coating on photovoltaic module. Though the performance of power generation is decreased by lapse of time and higher insolation(more than 600W/m2) conditions, It is expected that the average power generation will be increase more than 5% by adopting super hydrophilic nano-coating agent such as SKG.
디버링 휠의 회전수 변화에 따른 디버링 특성에 관한 실험적 연구
천경호(Kyeong-Ho Cheon),김해지(Hae-Ji Kim) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.5
The modern aircraft consists of tens/hundreds of thousands of components. A large proportion of these components are manufactured using a machining process. A deburring process must be performed after to machining. This study investigates the effect of changes in the deburring wheel rpm on the deburring force and radius. The deburring wheel is used to trim sharp edges off machined parts of the aircraft. The deburring wheel used consists of a core and a nylon hair(this new concept is protected under patent). We find that higher deburring wheel rpm results in increased deburring force and radius. For deburring wheel rotation rates of 500~750rpm, deburring force of 3.4~6.5kgf and deburring radius of 0.4~0.5mm were observed.
분리된 다축 장비의 B축 얼라인먼트 측정 장치에 관한 연구
천경호(Kyeong-Ho Cheon),김해지(Hae-Ji Kim) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
These days, the aerospace industry uses larger machining parts and assembly parts than those in the past. The assembly machines also show the same trend. This study is concerned with the alignment measuring apparatus for the B-axis of a separated multi-axis machine. The alignment measuring apparatus is widely installed for assembly machines in the aircraft assembly process. The alignment measuring apparatus consists of a swivel part and a measuring part. This is a new conceptual idea under patent. All elements of the alignment measuring apparatus are analyzed with the FEM. The analyzed result shows that the alignment measuring apparatus is high in accuracy with stability and steady deformation.
자연토양 및 카올린에 대한 코발트, 스트론튬, 세슘의 흡착 특성
천경호 ( Kyeong Ho Cheon ),최정학 ( Jeong Hak Choi ),신원식 ( Won Sik Shin ),최상준 ( Sang June Choi ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.9
In this study, as a fundamental study for the remediation of the radionuclides-contaminated soil, the adsorption of cobalt, strontium, and cesium on natural soil and kaolin were experimently investigated and adsorption characteristics were evaluated by using several adsorption kinetic and isotherm models. The pseudo-first-order kinetic model (PFOM), pseudo-second-order kinetic model (PSOM), one-site mass transfer model (OSMTM), and two compartment first-order kinetic model (TCFOKM) were used to evaluate the kinetic data and the pseudo-second-order kinetic model was the best with good correlation. The adsorption equilibria of cobalt, strontium, and cesium on natural soil were fitted successfully by Redlich-Peterson and Sips models. For kaolin, the adsorption equilibria of cobalt, strontium, and cesium were fitted well by Redlich-Peterson, Freundlich, and Sips models, respectively. The amount of adsorbed radionuclides on natural soil and kaolin was in the order of cesium > strontium > cobalt. It is considered that these results could be useful to predicting the adsorption behaviors of radionuclides such as cobalt, strontium, and cesium in soil environments.