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강성락,나창운 한국고무학회 2008 고무기술 Vol.9 No.2
지금까지 고무소재는 고무만이 갖는 독특한 점탄성과 동적 평형상태에서도 연구가 가능하다는 사실 때문에 일반 산업 현장에서 뿐만 아니라 군수산업에서도 매우 폭넓게 적용되고 있다. 본 리뷰에서는 해양분야, 특히 해군에서 응용되고 있는 고무 소재들에 대해서 살펴보고, 각 응용분야에 대한 기본적인 적용기술에 대해 논의하였다.
강성원(Sung-won Kang),이후락(Hoo-Rock Lee),심상용(Sang-yong Sim),김용환(Yong-hwan Kim),김용식(Yong-sik Kim),박창대(Chang-dae Park),정경열(Kyung-Yul Chung) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
High concentration fresnel lens design is required for high optical efficiency for CPV(Concentraion Photovoltaic)system. But optical efficiency of fresnel lens increases with focal length. Too much longer focal length is not reasonable for practical CPV module. Optimized and cost effective focal length is feasible for practical CPV module. Draft angle and facet corner rounding are great loss factor of optical efficiency for practical fresnel lens manufacture procedure. Optical efficiency of fresnel lens design is not only determined from focal length of its lens but from its draft angle and facet corner rounding. We will analysis optical loss factor of fresnel lens with its draft angle and facet corner rounding.
476배의 집광 비를 갖는 프레넬 렌즈를 이용한 이차 광학계 설계
강성원(Sung-won Kang),심상용(Sang-yong Sim),김용환(Yong-hwan Kim),김용식(Yong-sik Kim),이후락(Hoo-Rock Lee),박창대(Chang-dae Park),정경열(Kyung-Yul Chung) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
Primary fresnel lens with 476X concentration factor has its focal length of 200㎜. Focal length of primary lens is set up for size of 5㎜ by 5㎜ triple junction solar cell. Tilted angle of incident sun light causes focal point of primary fresnel lens away from its original position. Secondary optics is built on corrected version of its tilted angle tolerance of ±1°. This design is modeled from spherical type lens due to low cost of manufacture. We analyze both solar ray distributions of focal point region in case of no secondary optics and secondary optics. Secondary optics for our design are the most important issue for off axis from sun light. Advantages of secondary optical elements of our design are irradiation uniformity and acceptance angle tolerance of ±1°
고집광 프레넬 렌즈를 이용한 PV receiver raytracing simulation
강성원(Sung-won Kang),이후락(Hoo-Rock Lee),김용식(Yong-sik Kim),박창대(Chang-dae Park),정경열(Kyung-Yul Chung) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
High concentration fresnel lens PV system gives us reduction of solar cell cost and would become more profitable than any other PV system. PV concentrator system will have become one of the most efficient and profitable solar power system in the world market. In this paper we will describe ray tracing simulation with high concentration fresnel lens design. Tilted incident irradiation passing through fresnel lens will influence ray position on PV receiver. We also investigate lightpipe system on pv receiver in order to get uniform light beam profiles.
대류가용잠재에너지와 대류억제도에 입각한 여름철 습윤 대류 예측성에 대한 연구
맹도열,강성락 한국지구과학회 2023 한국지구과학회지 Vol.44 No.6
This study analyzed rawinsonde soundings observed during the summer and early fall seasons (June, July,August and September) on the Korean peninsula to examine the utility of the Convective Available Potential Energy(CAPE) and Convective Inhibition (CIN) in predicting the occurrence of deep moist convection and precipitation. Rawinsonde soundings are categorized into two groups based on thermodynamic criteria: high CAPE and low CINrepresent a high potential for deep moist convection; low CAPE and high CIN indicate conditions unfavorable for deepconvection. A statistical hypothesis test is conducted to determine whether the two groups are significantly different interms of 12-hour cumulative precipitation, 12-hour mean cloud base, and 12-hour mean mid-level cloud cover. The results,in the case of no-precipitation, reveal statistically significant differences between the two groups, except for the 12-hourmean cloud base during the 21:01-09:00 KST time period. This suggests that the group characterized by high CAPE andlow CIN is more conducive to the occurrence of deep moist convection and precipitation than the group with low CAPEand high CIN.