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Prediction and Measurement for Harmonics on the Test Track of Seoul-Pusan High-speed Railway
오광해(K.H. Oh),이장무(C.M. Lee),한문섭(M.S. Han),이기원(K.W. Lee),권삼영(K.S. Kwon),창상훈(S.H. Chang),김길상(K.S. Kim) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper proposes a new model for harmonic analysis in 2×25㎸ traction power supply system including inverted feeder, contact line, rails and auto-transformer. The system model is based on four-port representation which is an extension of two-port network theory. In order to verify the proposed approach, we have analysed and tested real traction power feeding system focused on the amplification of harmonic current. The calculation results from the proposed approach and the measurement data from the test are widely described in the paper.
이재순(J . S . Lee),노은운(E . W . Noh),이석구(S . K . Lee),권기원(K . W . Kwon) 한국산림과학회 1994 한국산림과학회지 Vol.83 No.1
In woody species with a long life span, the studies on inheritance of any trait may be very time consuming and laborious. Chloroplast DNA(cpDNA) has been a valuable tool in such studies since it has several unique features such as limited genome size and cytoplasmic inheritance. In the present study, cpDNAs from five different species of Populus (P. alba, P. glandulosa, P. alba x P. glandulosa, P. davidiana, and P. nigra), and Nicotiana tabacuna were compared with regard to restriction fragment length polymophism. The results showed that cpDNAs among the species were very conserved, although some polymorphisms were observed when the DNAs were digested with restriction enzyme EcoRI or KphI. The other enzymes (Bgl II, and PstI) tested produced identical restriction fragmentation pattern among the species. However, cpDNAs from all the five Populus species showed different restriction fragmentation pattern from that of tobacco with the four restriction enzymes tested. Southern hybridization with tobacco rbcL gene fragment as a probe also produced identical pattern among Populus species. The results indicate that cpDNAs in the genus are very well conserved during evolution.