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이현철 대한미생물학회 1987 大韓微生物學會誌 Vol.22 No.2
Ten species of herbae, which have been used to treat cancers in Chinese medicine, were tested to investigate their mutagenieity or antimutagenicity in S. typhimurium TA97, TA98, TA100, TA1S35, and TA1538. Scolopendra centipede was weakly active in reversion of the frameshift mutation in S. typhimurium TA97 strain and the base-pair substitution in TA100 and TA1535 strains. Other herbae such as Coix lachryma, Dianthus superbus, Tricanthoshse kirilowii, Eupatorium formo- sanum, Lithospermum erythrorliizon, Arisaema japonicum, Curcuma aedoaria, Helicteres angustifolia, and Euonymus sieboldianus did not show any of the mutagenic potential, regardless of the metabolic activation with rat hepatic microsomal fraction. Dianthus superbus, Eupatorium formosanum, and Euonymus sieboMianus exhibited suppressive activities on microbial mutagenesis of N-methyl-N-nitrosoguanidine, a basepair substitution mutagen, in TA1535 and TA10G tester strains. The antimutagenic activities of Dianthus superbus and Euonymus sie- boldianus appeared to be dose-dependant.
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WT평면에서의 디지탈 청각 보조 신호 처리 시스템의 설계
이현철,석광원 대한의용생체공학회 1996 의공학회지 Vol.17 No.3
This paper presents digital hearing aids signal processing system in WT(wavelet transform) domain. For implementation of hearing aids in WT domain, the gain in frequency domain is approximated in WT domain. We also present the gain selection algorithm to deal with the change of input signal power. Most transform methods produce blocking effect, and this effect degrades the convergence rate of feedback canceller. As a solution, we proposed wavelet transform bascd feedback canceller. To evaluate the performance, we compared it with LOT (lapped orthogonal transform) method in the frequency domain. This system has not shown the blocking effect, and improves convergence rate as compared with the LOT based feedback canceller.
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이현철,석광원,전철완,이진,이영석,김성환,Lee, H. C.,Seok, K. W.,Jon, C. W.,Lee, J.,Lee, Y. S.,Kim, S. H. 대한의용생체공학회 1996 의공학회지 Vol.17 No.3
The patency of small size vascular grafts is poor, and the blood flow characteristics in the artery graft anastomosis are suspected as one of the important factors influencing intimal hyperplasia. Disturbed flow patterns caused by sixte and compliance mismatch generate unfavorable flow environment which promotes intimal thickening. Tapered vascular yuts are suggested in order to reduce sudden expansion near the anastomosis. The photochromic flow visualization method is used to measure the flout fields in the end-to-end anastomosis model under the carotid and femoral artery flow wave form. The results show that flow disturbance near the anastomosis is diminished in the tapered grafts comparing to the tubular graft. As the divergent ang1e decreases, we can reduce the low and oscillatory wall shear stress zone which is prone to intimal hyperplasia. The flow wave form effects the wall shear rate dis- tribution significantly. The steep deceleration and back flow in the femoral flow wAve form cause low mean wall shear rate and high oscillatory shear index.
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지분형 주택분양제도의 성공적인 도입을 위한 영향요인 분석
이현철,임소연,고성석,Lee, Hyun-Chul,Lim, So-Yean,Go, Seong-Seok 한국건설관리학회 2010 한국건설관리학회 논문집 Vol.11 No.1
The purpose of this study is to find decisive factors affecting Share-styled Apartment house Lee Myung-bak announced for the homeless masses in February 2008. This policy tried to add up defects from Half-priced Apartment house enforced in 2007. Seoul is ranked as the highest PIR(Price Income Rate) city in the world, as far as the difficulties in getting own house is concerned. Korean government has announced a lot of policies to control the price of real-estate, especially housing bubble phenomenon, since the convalescence from IMF financial crisis. By making questionnaires to get an important factor and taking counsel with related specialists, this thesis found what kind of roles the objects including government, institutions and people should play or focus on.
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가변 스텝 크기 알고리즘을 이용한 CATV 수신기용 블라인드 등화기의 성능 향상에 관한 연구
이현철,조일준,진현수,김성환,Lee, Hyeon-Cheol,Jo, Il-Jun,Jin, Hyeon-Su,Kim, Seong-Hwan 한국음향학회 1996 韓國音響學會誌 Vol.15 No.6
In this paper, we resolved a trade-off problem of the blind equalizer based on the stop-and-go algorithm that is commonly used for QAM demodulation in CATV receiver. The stop-and-go algorithm has used the LMS(least mean square) algorithm in the updating operation of tap weights so that the structure of equalizer is simple, but there is a trade-off between convergence speed and steady state error as in the typical LMS algorithm. We used the variable step size algrithm to improve the convergence speed with the steady state error in the constant level. With respect to the same level of the steady state error, the variable step size stop-and-go algortihm improved convergence speed by about $36%{\sim}56%$ as compared with that of the constant step size algortihm.
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