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임종근(Jung-Gyun Lim),류윤기(Yoon Ki-Ryu) 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.2 No.춘계
항해 안전을 도모하기 위해 설치되는 항로 표지용 RACON은 선박의 충돌방지 및 항해 안전에 중요한 역할을 한다. 본 연구는 해양수산 개발과제로 진행된 RACON의 국산화 연구를 통해 X-밴드 및 S-밴드 송수신 모듈 및 제어 모듈과 각종 기구물의 개발이 이루어졌고 실제 사용될 수 있는 현장에 설치되어 선박을 통한 검증이 이루어짐으로써 향후 국내에 공급되는 RACON을 국산화로 대체할 수 있는 계기가 마련되었다.
충전제로서의 ZnO 적용에 따른 종이의 보존 특성 평가
임종근(Jong-Keun Lim),Lili Melani,김형진(Hyoung-Jin Kim) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.4
The deterioration of paper is usually caused by the environmental and biological factors. Typically, environmental factors, like temperature, humidity, and biological factors, like insects and fungi influence on the degradation of paper. Some fungi can grow on paper to deteriorate the cellulose compositions under certain environmental conditions. Zinc oxide (ZnO) is white powder having antimicrobial function. In this study, zinc oxide was added to the wet-end process in papermaking to increase the resistance to biological degradation of paper. The addition of ZnO particles showed a positive effect on the physical and optical properties of paper and on the characteristics of accelerated aging of cellulosic fibers. The effect depended on the sizes, micro- or nano-, of ZnO particles. The single polymer and micro particle retention system resulted in a higher retention of ZnO. The ash content of paper was increased with the amount of ZnO addition and it was increased more significantly with nano-size ZnO than micro-size ZnO. ZnO-added sheet had the higher tensile and larger folding endurance than CaCO₃-added sheet. The physical strength of nano-size ZnO-added paper was also higher than that of micro-size ZnOadded sheet. Under the accelerated aging treatment, ZnO-added sheet also showed superior tensile index and folding endurance.
180° Bend에서 층류 정상유동의 유동특성에 관한 연구
임종근(Jong-Keun Lim) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
In this study, The flow characteristics of developing laminar steady flow in a 180° bend of square cross-section curved duct are experimentally investigated using laser-doppler velocimetry. The critical Dean number in a curved duct for laminar steady flows is larger rather than in a straight duct. The friction factor in a straight duct in correlated as ist=57/Rest in laminar flow region of the fully developed steady flow, and friction factors for the square duct are smaller than those for the circylar duct at the same Reynolds number. And the entrance length is well agreed with the equation, ∅=49Re1/3Rc-1/2 suggested by Austin, L. R. and Seader, J. D. in the present experimental conditions.
선택적 에미터를 적용한 고효율 결정질 실리콘 태양전지 구조 설계
임종근(Lim, Jong-Keun),이원재(Lee, Won-Jae),문인식(Moon, In-Sik),오훈(Oh, Hoon),조은철(Cho, Eun-Chel) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
This paper presents the technology of selective emitter for high efficiency crystalline silicon solar cell. The effect of selective emitter is analyzed by using the simulation program for solar cell, PC1D. The selective emitter shows better spectral response in short wavelength regions compared to homogeneous emitter. Therefore, the efficiency of solar cell with selective emitter can be improved by changing the sheet resistance from 60 Omega/square to 120 Omega/square. In addition, the power loss of solar cell can be minimized by optimizing width and gap of the finger electrodes on the selective emitter.
Ag/ZnO 복합체 충전이 종이의 항진균성에 미치는 영향
임종근(Jong-Keun Lim),Lili Melani,김형진(Hyoung-Jin Kim) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.4
Paper is generally worn by the physical, chemical and biological factors which influence on the long term preservation stability resulting in preserving paper cultural assets. Generally, nano Ag and ZnO have been known to have anti-microbial functions. In this study, these have been evaluated to their effects on increasing the resistance against the biological degradation of the cultural assets. Ag/ZnO composites were prepared by photocatalytic reduction of Ag+ on ZnO with ethanol as the hole scavenger. The Ag/ZnO composite features were analyzed by XRD, SEM-EDS measurement. The photocatalytic reduction was found suitable for Ag loading due to its short reaction time and simplicity. Papers prepared with micro size ZnO (m-ZnO), nano size ZnO (n-ZnO), and Ag/ZnO addition were tested on physical, optical, and antifungal properties. The strength of the n-ZnO added paper was higher than that of the m-ZnO added paper and that of the Ag/ZnO composite added paper. The Ag/ZnO added paper showed a tendency to improve opacity, but its brightness was degenerated. The antifungal test using Aspergillus niger and Trichoderma viride confirmed antifungal property in the Ag/ZnO composite paper and ZnO particles added paper. Especially, the antifungal property was shown to have significantly increased by Ag/ZnO composite. And the smaller ZnO particle size with its higher addition increased antifungal activity in paper.