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김철우,김영조,Kim, Cheol-Woo,Kim, Young-Cho 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.9
A measurement method of the particle-based reflective display is proposed, estimated, and compared with reported method. The reflectivity measurement by previous studies is simply obtained by integrating sphere, but it has a limitation for the estimation of real moving particles because its data include surface reflection and incomplete attachment on electrodes. To get the number of real moving particles, the area by attached particles on the electrodes is calculated at microscopic signals. The moving particles on subthreshold voltage are observed and this fluctuational variation of surface on subthreshold voltage gives a tip to understand the driving mechanism. By this measurement we ascertained the relationship of a particle layer and real driving particles, and the feasibility of observation and estimation for moving color particles, which were measured by the reflectivity and CIE (Commission Internationale de I'Eclairage) system of color specification at previous studies.
김철우,박병순,Kim, Cheol-U,Park, Byeong-Sun 한국건강관리협회 2007 건강소식 Vol.31 No.3
피부는 신체를 둘러싸고 있는 하나의 막이다. 이것은 우리의 생명 보존에 절대 불가결한 것이며 그 사람이 살아온 과정과 연륜을 말해주는 것으로 나무의 나이테와 같은 것이라고 할 수 있다. 피부의 총 면적은 개인에 따라 약간씩 차이는 있지만 평균 1.5~2.0㎡ 정도이고 피부의 두께는 평균 2mm이며 피하조직을 제외한 두께는 약 1.4mm정도이다. 신체 부위 중 가장 얇은 곳은 눈꺼풀이며 가장 두터운 곳은 손, 발바닥이다. 인체의 신비를 보여주는 우리 몸의 기관 그 세 번째 피부에 대해서 한림대학교 성심병원 피부과 김철우 교수, 리더스 피부과(강남 압구정점) 박병순 전문의의 도움말로 알아본다.
김철우,이완직,이선우,이경호,한기준,Kim, Cheol-U,Lee, Wan-Jik,Lee, Seon-U,Lee, Gyeong-Ho,Han, Gi-Jun 한국정보처리학회 1997 정보처리학회논문지 Vol.5 No.1
영상 미디어 전송에 있어 영상 획득, 압축, 전송의 과정이 한 시스템에서만 이루 어진다면 실시간 멀티캐스트 전송이 이루어질 수 없을 뿐만 아니라 여러 네트웍을 거 치는 동안 전송 지연이 커진다. 본 논문에서는 영상 획득, 압축, 다중 전송의 부하 (Load)들을 병렬처리하는 실시간 영상 다중 전송 서버 시스템을 구현하였으며 태스크 간 처리 속도 차이에 의해 발생하는 흐름 제어 문제를 해결하기 위한 매커니즘을 제 시하였다. Real-time video multicast using a single computer system is a difficult task because capturing, compressing and delivering video causes a long delay in internetworking environments. This paper describes an implementation of the real time video multicasting server which processes video capture, compression and multicasting in parallel. This paper also presents a flow control mechanism to solve a problem caused by difference between the three tasks.
한국산 집먼지진드기 진중체 항원 알레르겐 표준화 : In vivo 방법에 의한 표준화
김철우,박중원,홍천수 (Cheol Woo Kim,Jung Won Park,Chein Soo Hong) 대한천식알레르기학회 1998 천식 및 알레르기 Vol.18 No.2
Backgound and objective. House dust mites have been known as the most important allergens in respiratory allergic disease. Since environmental factors may have influences on the pathogenesis of allergic disease, the study using Korean house dust mites for immune and biologic reactions in house dust mite-sensitive allergic disease is considered as significant. Material and method: We made two in-house allergenic extracts of Korean house dust mites (D. farinae and D. pteronpsssinus) and performed this study for the allergen standardization by in vivo methods and for the evaluation of the reliabilities for clinical applications. Result: As a results of biologic standardization using skin prick test teachnique, the activity of 1: 1,500w/v of D. farinae extract was estimated 1,000 biology unit(BU), concentration that elicits a wheal of the same size as that of histamine dihydrochloride 1mg/ml. The activity of 1: 1,000w/v of D. pteronyssinus was condiered as 1,000BU. The activity of 1:100w/v of both D. farinae and D. pteronpssiuns extracts were considered as 100,000 Allergy Unit(AU), based on intradermal skin testing of 30 subjects with strong sensitive reaction. The concordant rates between results of skin prick test done with 5,000BU/ml concentration of in-house allergenic extracts and thoae with the commercially available allergen(Bencard Co., UK) were 84.6% and 81.0% for D. farinae and D. pteronpssinus, respectively. The wheal erythema size and A/H ratios induced by in-house extracts were significantly correlated with those induced by Bencard allergen. Conclmion '. This results suggest that in-house extracts of the whole bodies of two house dust mites have good allergenic activities in vivo. It is considered to be clinically useful and reliable allergenic extracts.
김철우,Kim, Cheol-U 한국정보통신집흥협회 2004 정보화사회 Vol.166 No.-
이제는 LBS가 일반적인 서비스의 한 부분으로 정착되어 많은 사업자와 사용자로부터 주목을 받고 있으며, 향후 '킬러 어플리케이션' 영역으로 기대되고 있다. 유럽의 통신업체인 Nokia는 2010년 경에는 LBS 요금이 전체 사용금액의 20%를 상회할 것으로 예측하고 있다.
이개부 병변을 가진 하악 대구치의 치료에 있어 치근절제술과 터널화의 임상결과 비교
김철우,박진우,서조영,이재목,Kim, Cheol-Woo,Park, Jin-Woo,Suh, Jo-Young,Lee, Jae-Mok 대한치주과학회 2009 Journal of Periodontal & Implant Science Vol.39 No.1
Purpose: The resective treatment in mandibular Degree III furcation areas includes root resection and tunnel preparation. The purpose of this retrospective study is to evaluate which treatment procedure(root resection vs tunnel preparation) has more favorable prognosis in mandibular Degree III furcation involvement. Materials and methods: The subjects of this study were patients who were treated their mandibular posteriors with either root resection(22 teeth on 22 patients) or tunnel preparation(24 teeth on 22 patients) and have participated in periodic recall check program for at least 2 years. Failure rate, plaque index, bleeding on probing and probing pocket depth were measured and the results were compared and statistically analysed. Results: Failure rates of root resection and tunnel praparation were 13.6% and 16.7%, respectively, and showed no significant difference between two procedures. No significant differences were observed between two procedures with respect to plaque index, bleeding on probing and probing pocket depth. Conclusion: root resection and tunnel preparation are both effective procedures to treat mandibular posterior furcation involvement, if adequate treatment of choice is made and patient's cooperation is accompanied. However, tunnel preparation is more preservative procedure in mandibular posterior furcation involvement since root canal treatment and prosthetic restoration are needed additionally, in case of root resection.
김철우(Cheol Woo Kim),문종성(Jong Sung Moon),김정규(Jung Gyu Kim),맹철수(Cheol Soo Maeng),성기광(Ki Kwang Sung),김현민(Hyun Min Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Since the top mounted in-core instrumentation (TM-ICI) system has abilities to cope with severe accidents for simple configuration and no penetration of the reactor lower head, TM-ICI is under development in Korea. Therefore it needs development of the reactor internals for the TM-ICI. This paper introduces a finite element model of the reactor internals for TM-ICI and its dynamic characteristics for future structural response analyses.
확장성심근중 환자에서 Enalapril 치료가 좌심실내경의 순간변화율에 미치는 영향
김철우(Cheol Woo Kim),정유석(Yoo Suk Jung),이광제(Kwang Je Lee),곽미향(Mi Hyang Kwak),김경만(Kyung Man Kim),김태호(Tae Ho Kim),김치정(Chee Jeong Kim),류왕성(Wang Seong Ryu),유언호(Un Ho Ryoo) 대한내과학회 1997 대한내과학회지 Vol.52 No.5
N/A Objective: Angiotensin-converting enzyme inhibitors have been shown to improve survival in patients with congestive heart failure. To evaluate the efficacy of enalapril in patients with dilated cardiomyopathy during concurrent treatment with digoxin and diuretics, the peak rates of left ventricular movement were assessed after 6 months of follow-up by digitized echocardiography. Methods: Using a high quality digitizer, continuous measurement of left ventricular dimension and its rate of change (dD/dt) were obtained throughout the cardiac cycle. Normalized rates of wall movement (dD/dt/D) were used for comparison. Results: 1) Compared with control subjects, patients with dilated cardiomyopathy showed much lower Peak(-) dD/dt and Peak(-) dD/dt/D. 2) Peak(+) dD/dt and Peak(+) dD/dt/D were also depressed in patients. 3) Peak dD/dt improved significantly (p<0.05) in the enalapril group (n=16), but did not change in the conventional treatment group (n=20) after 6 months. Peak dD/dt/D improved approximately (p<0.005) in the enalapril group. 5) There were no deaths in 2 treatment groups during initial 6 months, but 3 patients in the conventional treatment group died suddenly during 1 year of follow-up. Conclusion: The present study has shown that left ventrieular Peak dD/dt and Peak dD/dt/D are significantly depressed in patients with dilated cardiomyopathy. Enalapril appears to provide well-tolerated and effective long-term therapy by improving peak rates of left ventricular movement in patients with dilated cardiomyopathy.