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투광형 비정질,결정질 BIPV 시스템의 LCC 평가에 관한 연구
이한명,오민석,김회서 단국대 부설 리모델링연구소 2009 리모델링 연구소 논문집 Vol.7 No.1
This study was carried out to evaluate the Life Cycle Cost(LCC) of four types of BIPV(Building Integrated Photovoltaic) systems -Glass plus Granite, Crystalline BIPV, Crystalline BIPV+ Glass plus Granite and See through Amorphous BIPV -which were vertically installed to generate the same capacity(2kW) and the same area. Initial investment costs, cost savings and maintenance costs had been predicted during the period of analysing the LCC of four types of BIPV(Building Integrated Photovoltaic) systems installed for the purpose of evaluating the LCC. In case of cost savings, it had been analyzed by measuring the amount of electric power generated, reduction in lighting load and heat & cooling loads through simulation. From this analysis, it was predicted that the See-through amorphous BIPV offering cost saving advantages demonstrated the economical efficiency similar to the Glass plus Granite when it is backed by more than 20 years of durability.
具然健,金斗根,李漢明 弘益大學校 1983 弘大論叢 Vol.15 No.2
A procedure for designing a band-pass filter of quarter-wavelength microstrip resonator with interdigital array is presented. After the design curve is determined experimentally by the resonance phenomena of several pairs of resonators, the microstrip interdigital filter for center frequency of 700 MHz and fractional bandwidth of 20% is designed. It is obtained that the fractional bandwidth is 19.43%, centered at 695 MHz. An experimental results show that the computed values almost agree with measured values except for the ripple which is negligible.
한 개의 CI가 치환된 YBCO에 대한 결합과 전자구조
이기학,박성수,이왕로,이한명 圓光大學校 1996 論文集 Vol.31 No.2
본 연구에서는 확장된 Huckel 분자궤도 tight binding 계산 방법을 사용하여 초전도체인 YBa₂Cu₃O 의 산소 원자 위치에 염소 원자가 각각 한 개씩 치환된 YBCO 계의 하전된 덩어리 모델의 전자구조와 성질을 연구하였다. 분자들의 isomorphism 문제를 분석함과 같이 염소 원자로 산소 원자 위치인 O1, O2p, O3p, O4p, O2n, O3n 과 O4n에 산소 원자 한개를 치환하였으며 또한 부가될수 있는 위치인 O5 에 부가하여 모든 가능한 조합에 대하여 계산을 하였다. 그 결과로 염소 원자로 O1 위치 또는 O5 위치에 대치된 YBa₂Cu₃O xClx 의 전자구조, band 구조 그리고 상태밀도 (DOS) 가 YBa₂Cu₃O 과 가장 비슷함을 보였다. 이것은 CuO₂층의 산소 원자가 초전도성에 매우 민감한 것을 암시한다. Using the extended Huckel molecular orbital tight binding (EHMO-TB) calculation, we have studied the electronic structure and properties of charged clusters model corresponding to one Cl-substituted YBCO in which O-atom(s) in regular site is replaced by Cl-atom(s) for superconducting YBa₂Cu₃O. In analogy to the isomorphism problem with molecules, we calculated all possible cases of one Cl-substitutions in O-sites with O1, O2p, O3p, O4p, O2n, O3n and O4n and case of one Cl-addition in vacancy with O5. Our results suggest that the electronic structure, the band structure, and density of states (DOS) of YBa₂Cu₃O xClx, with O1- or O5- site replaced by Cl appears to be the closest to that of YBa₂Cu₃O. This implies that the superconducting is very sensitive to the oxygen atoms of CuO₂layers.