http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이범선,박광규 대전대학교 산업기술연구소 1999 산업기술연구소 論文集 Vol.10 No.2
Based on the equilibrium equations and the D'Alembert principle, the governing equations for simple beam subjected to harmonic load are derived in this study. A trial eigenvalue method is used for determining the natural frequencies. The harmonic vibration analysis for an simple beam with an uniform cross-section, using finite element method, was investigated. The result in this study was consisted with the values obtained by other numerical method and SAP2000.
이범선,이일용,박정일,박경룡,연광일,어익수,강인,Lee, Bom-Son,Lee, Il-Yong,Park, Jung-Il,park, Kyung-Ryung,Yeon, Kwang-Il,Eo, Ik-Soo,Kang, In 한국전자파학회 1998 한국전자파학회논문지 Vol.9 No.3
복잡하고 다양한 전파 환경을 라이시안 채널로 모델링할 수 있는 가능성에 대해서 검토해 보았다. 라이시안 채널에서의 수신 신호를 컴퓨터 시뮬레이터를 제작하여 모의 실험하였고, 모의 실험된 신호의 PDF(포락선 크기의 분포), PSD(Power Spectral Density), LCR(Level Crossing Rate), ADF(Average Duration of Fades), BER(Bit Error Rate)를 이론치와 비교한 결과 매우 잘 일치함을 확인할 수 있었다. The possibility of modeling the complex and diversified radio environment using Rician channel has been considered. The signals received in Rician channel have been simulated using the computer simulator. The PDF(Probability Density Function of the Envelope amplitude), PSD(Power Spectral Density), LCR(Level Crossing Rate), ADF(Average Duration of Fades) and BER(Bit Error Rate) of the simulated signal have been compared with those of theory. They were shown to be in good agreement.
이범선,Jeon Yong Hwan,Ju Se Hun,고윤,박진섭,이준우,Yang Huijun,나해영 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.6
This study investigated the diff erences in light intensity, photosynthetic effi ciency, and growth characteristics of paprika plants cultivated in a semi-closed greenhouse covered with low-iron diff use glass (SG-LDG) and a conventional greenhouse covered with low-iron regular glass (CG-LRG). There was no signifi cant diff erence in light intensity between the SG-LDG and CG LRG from the apical meristem to below 100 cm. However, below 150 cm, the SG-LDG showed higher light intensity than the CG-LRG. The light response curve and atmospheric CO 2 response(A-C a ) curve, which represent photosynthetic effi ciency, were not signifi cantly aff ected by crop canopy diff erences between the two greenhouses during the early cultivation stage. However, after 12 weeks of planting, SG-LDG showed higher photosynthetic effi ciency. The J max and V cmax values showed no diff erences between the plants in the two greenhouses until 4 weeks after planting. 12 weeks after planting, plants in SG-LDG showed higher J max and V cmax values than those in CG-LRG. All the growth characteristics of plants cultivated in SG-LDG were superior to those of plants cultivated in CG-LRG. Therefore, the improvement in light intensity and photosynthetic effi ciency at the lower positions of plants in SG-LDG is considered to have a positive impact on crop quantity and quality.