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국내 개발된 $N-tox^{(R)}$ 생물검정 시스템을 이용한 시안과 3, 5-이염화페놀의 발광박테리아(Vibrio fischeri)에 대한 혼합 독성 영향 연구
이정석,이규태,김찬국,김혜진,이창훈,이종현,Lee, Jung-Suk,Lee, Kyu-Tae,Kim, Chan-Kook,Kim, Hye-Jin,Lee, Chang-Hoon,Lee, Jong-Hyeon 환경독성보건학회 2007 환경독성보건학회지 Vol.22 No.1
Cyanides and dichlorophenols were important pollutants in industrial effluents of steel, petroleum, plastics, pesticides, synthetic dye and/or fiber manufacturing. The toxic effects of cyanide and 3, 5-dichlorophenol in the unary and binary solutions to Vibrio fischeri were determined using the newly developed $N-tox^{(R)}$ bioassay system. This bioassay system relies upon the attenuation of light intensity emitted by Vibrio fischeri exposed to various pollutants including metals and organic compounds. Most of studies dealing with toxicity of pollutants concerned single chemical species, while the organisms were typically exposed to pollutant mixtures. The present study showed that the toxicity of some binary combinations of cyanide and 3, 5-dichlorophenol significantly was lower than the predicted toxicity from the addicted model. This antagonistic interaction was well explained by chemical interaction model presented in this study.
이정석,김종한,김유창,김정선,김원후,Lee, Jung-Suk,Kim, Jong-Han,Kim, Yoo-Chang,Kim, Jung-Sun,Kim, Won-Hoo 대한전자공학회 2001 電子工學會論文誌-TC (Telecommunications) Vol.38 No.10
Ultra Wide Band (UWB) system uses wide band signal, which power spectral density is over all band, It likes as a noise floor, so UWB system can be used without interfering with other communication system. For the first time, we adopted Rayleigh mono pulse antipodal signal which had symmetric characteristic and zero mean. With the power spectral density using stochastic process, we knew that the antipodal signaling scheme removed discrete spectrum and concluded that this had much better spectral suppression, probability of error and data rate than PPM (Pulse Positioning Modulation). 초광대역 통신은 전 주파수 대역에 걸쳐 스펙트럼이 존재하는 광대역 신호를 이용하는 방식이다. 이 신호의 스펙트럼은 마치 기저 대역 잡음과 유사한 형태로 존재하고 그 전력 또한 매우 낮게 구성할 수 있으므로, 타 통신 시스템에 간섭을 주지 않고 통신을 가능하게 한다. 따라서 본 논문에서는 평균값이 0이고 대칭성을 갖는 레일리 모노펄스 Antipodal 방식을 처음으로 적용하였다. 확률 과정에 의한 전력 스펙트럼을 분석한 결과, 기존의 펄스 위치 변조에서 발생되는 불연속 스펙트럼을 완전히 제거하여 스펙트럼의 억압도를 높이고, 오류 확률 및 전송 속도 면에서도 유리함을 보였다.
경부 2, 3번 피부절을 침범한 Ramsay-Hunt 증후군 1례
이정석,최용석,송은향,김정미,한정호,김두응,Lee, Chung Seok,Choi, Yong Seok,Song, Eun Hyang,Kim, Jeung Mee,Han, Jeong Ho,Kim, Doo Eung 대한임상신경생리학회 2002 Annals of Clinical Neurophysiology Vol.4 No.1
Ramsay-Hunt syndrome is a viral disease associated with peripheral facial nerve paralysis accompany by erythematous vesicular rashs on the ear(zoster oticus) or in the mouth. Based on clinical presentations that indicated involvement of more than one ganglion, the gasserian, geniculate, petrous, accessory, jugular and second and third dorsal root ganglia comprised a chain in which inflammation of a single ganglion could extend to nearby ganglia. A 71-year-old man presented with left. peripheral facial palsy with otalgia, vesicular eruption in $V_2$, $V_3$, C2, C3 dermatome, tinnitus, and hearing loss.
이정석,이선동,김진현,Lee Joung-Seok,Lee Sun-Dong,Kim Jin-Hyun 대한예방한의학회 1998 대한예방한의학회지 Vol.2 No.1
At the result of data analysis with sample survey, oriental medicine clinics which treat particular kinds of illness with specialization make the profit of 1.6 times and the expense of 0.74 times more than those which treat general diseases, namely, the former gain the profit of about 2.9 times more than the latter. After excluding other variables which affect in the profit of oriental medicine clinics with multiple regression model, when considering only advantage of treatment for particular kinds of illness, specialized oriental medicine clinics win the more profit of 18.3 percent than general oriental medicine clinics. The specialization of oriental medicine clinics can become one of the positive measures in the situation of enlargement of medical of oriental medicine, falling of oriental medicine price and conflict of western and oriental medicine, etc. The specialization can help western medicine replace with oriental medicine, and level and scientific system of oriental medicine improve. Medical service for particular diseases, one of the better devices for improving profit of oriental medicine clinics, can theoretically make more advantage of oriental medicine clinics through measure of price discrimination than general medicine clinics.
차세대 장수명 공동주택의 가변성능향상을 위한 건축요소기술 우선순위결정에 관한 연구
이정석,조건희,손정락,김재준,Lee, Jeong-Seok,Cho, Gun-Hee,Sohn, Jeong-Rak,Kim, Jae-Jun 한국건설관리학회 2009 한국건설관리학회 논문집 Vol.2 No.3
최근 가변성능에 관하여 공간, 재료, 구조, 공법 등 건설 산업 전반에 걸쳐 많은 연구가 진행 중이며, 이와 더불어 공동주택의 노후화 문제로 인하여 건축요소기술의 개발이 가속화되고 있다. 이에 따라 본 연구에서는 최근 사회적으로 부각되고 있는 가변성능에 관한 공동주택의 요소기술 선정 및 대상사례를 중심으로 한 설문조사와 전문가 의견을 거쳐 건축요소기술의 평가항목을 1차적으로 선정하고자 한다. 그리고 선정된 건축요소기술 항목 중에서 타당성 및 객관성 검증절차를 통하여 건축요소기술을 재정립 및 분류하고, 최종적으로 적용 가능한 다양한 건축요소기술 가운데 우선순위가 높은 항목들을 결정하여 분석 및 평가함으로써 향후 장수명 공동주택의 가변성능향상을 위한 지침을 제시하고자 한다. Recently, lots of the research aspects of space, materials, structure, construction method relation to improving the flexibility going on throughout the construction industry, moreover the development of construction key technology has been accelerating by reason of deterioration in the apartment housing. Therefore, this study should firstly suggests assessment list of construction key technology through investigation of questionnaire and consultation of the expert on the basis of case studies, and should select it about the flexibility which making social issues lastly in the apartment housing. Secondly, this study should classify, reestablish core technology through inspection procedure of feasibility study among lists of deduced key technology. Finally, this study will suggest the manual & guideline for improving the flexibility for a long-life apartment housing at the next generation by selecting, analyzing and estimating higher score items of all key technology.
Application of Indigenous Benthic Amphipods as Sediment Toxicity Testing Organisms
이정석,이규태,Dong-Hoon Kim,김찬국,Jong-Hyeon Lee,Kun-Ho Park,Gyung-Soo 한국해양과학기술원 2005 Ocean science journal Vol.40 No.1
series of experiments were conducted to develop standard test organisms and test protocols for measuring sediment toxicity using candidate amphipods such as Mandibulophoxus mai, Monocorophium acherusicum, Haustorioides indivisus, and Haustorioides koreanus, which are indigenous to Korea. The relevant association of test species with sediment substrates was one of the important factors in sediment bioassay. The indigenous amphipods M. mai and M. acherusicum were well associated with test sediments when they were exposed to various sediment substrates from sand to mud. The tolerant limits to various physico-chemical factors affecting bioassay results such as temperature, salinity and ammonia, as well as sensitivities to reference toxicant and contaminated sediments, were investigated using M. mai and M. acherusicum in the present study. These amphipods were tolerant to relatively wide ranges of salinity (10~30 psu) and ammonia (<50 ppm), and displayed relevant sensitivity to temperature as well. They are more sensitive to Cd, the reference toxicant, when compared to the standard test species used in other countries. Field-sediment toxicity tests revealed that M. mai would be more sensitive to sediment-associated pollutants than M. acherusicum, while the sensitivity of M. acherusicum was comparable to that of Leptocheirus plumulosus, which has been used as a standard test species in the United States of America. Overall results of this first attempt to develop an amphipod sediment toxicity test protocol in Korea indicated that M. mai and M. acherusicum would be applicable in the toxicity assessment of contaminated sediments, following the further evaluation encompassing various ecological and toxicological studies in addition to test method standardization.
동적 환경에서 불완전한 지도를 이용한 이동로봇의 강인한 위치인식 알고리즘의 개발
이정석,정완균,남상엽,Lee, Jung-Suk,Chung, Wan Kyun,Nam, Sang Yep 대한임베디드공학회 2008 대한임베디드공학회논문지 Vol.3 No.2
We present a robust localization algorithm using particle filter for mobile robots in a dynamic environment. It is difficult to describe moving obstacles like people or other robots on the map and the environment is changed after mapping. A mobile robot cannot estimate its pose robustly with this incomplete map because sensor observations are corrupted by un-modeled obstacles. The proposed algorithms provide robustness in such a dynamic environment by suppressing the effect of corrupted sensor observations with a selective update or a sampling from non-corrupted window. A selective update method makes some particles keep track of the robot, not affected by the corrupted observation. In a sampling from non-corrupted window method, particles are always sampled from several particle sets which use only non-corrupted observation. The robustness of proposed algorithm is validated with experiments and simulations.