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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.
이현철,강은수,유상범,이상규,용상순,정철호 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
본 논문에서는 계측기를 사용한 X 대역 영상레이더 시험모델을 설계/제작하고 autoSAR 로 지상시험하여 SAR 영상을 획득하는 연구를 수행하였다. 영상레이더의 구성품 중 신호증폭기, 신호복조기, 신호처리기는 직접 제작하고 파형발생기, 신호변조기, 후처리 S/W 는 기보유한 계측기 및 matlab 을 활용하여 SAR 영상을 획득하였다. 최종 해상도는 range 방향 0.41m, azimuth 방향 0.14m 이다. In this paper, X-band SAR prototype is designed and developed, and SAR image is acquired by AutoSAR. We used measurement equipment instead of the waveform generator and signal generator, and we also used Matlab for postprocessing. Signal Amplifier, signal demodulator, and signal processor are designed/manufactured. Final resolution is 0.41m(range direction), 0.14m(azimuth direction).
Proposal of Laboratory Test Panel Based on Patients’ Chief Complaints in Emergency Department
이현철,김유경,송정흡,송경은 대한진단검사의학회 2010 Annals of Laboratory Medicine Vol.30 No.4
Background : A test panel is a group of tests that are simultaneously performed for diagnosis and follow-up of patients. Organ-specific or disease-specific test panels are currently available. Since the patient’s chief complaint plays a key role in obtaining the personal and medical history and performing physical examinations, we proposed a test panel based on the chief complaints of the patients. Methods : We collected data from 3,127 adults with apparent symptoms who visited the emergency department from April 2009 to May 2009. Subsequently, we classified the patients’ chief complaints, ordered the laboratory tests on the basis of these complaints, considered the patients’ disease entities,and reviewed the relevant literature. Results : The patients were categorized into 14 groups on the basis of the most common chief complaints presented in the emergency department. We first selected the basic test panels and then organized the test panel for each chief complaint to enable differential diagnosis. Conclusions : We proposed test panels based on the chief complaints of the patients; these test panels could allow rapid diagnosis and be more useful than the organ-specific or disease-specific tests in critical pathway development. The next step will be evaluating the efficiency and cost effectiveness of the test panel that we suggested. (Korean J Lab Med 2010;30:444-50)