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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.
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,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(Cheol-Woo Kim),김병국(Byoung-Kook Kim),이평강(Pyeonggang Lee),임효재(Hyo-Jae Lim),강신형(Shin-Hyung Kang),최종민(Jong Min Choi) 한국지열·수열에너지학회 2010 한국지열에너지학회논문집 Vol.6 No.1
The aim of this study is to verify the performance of water-to-air multi-heat pump system with a vertical U-tube GLHX(U-tube system) and a double tube GLHX(double tube system), which were installed in a school building located in Asan. For analyzing the performance of the GSHP system, we monitored various operating data, including the water temperature of inlet and outlet of the ground heat exchanger, mass flow rate, and power consumption. Daily average COP of the single U-tube system and the double tube system were 4.5 and 4.2 at cooling mode and were 3.5 and 3.8 at heating mode. As a result, We know that performance of water-to-air multi-heat pump unit is reliable at actual condition operated in a part load conditions for all day.
김철우(Woo Cheol Kim),김동욱(Kim Dong Ok) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.6
본 논문에서는 GPS음영지역에서나 중계기가 설치되어 있는 환경에서도 위치를 추적할 수 있는 쏠리드스테이트를 이용한 방식을 제안한다. 사용자의 요구를 만족시키기 위한 서비스를 제공하는데 필수요소인 이동객체의 위치를 효과적으로 파악하고, 이동객체의 위치 정확도를 향상시킨 LTE환경에서 위치추적 시스템이다. 본 기술은 현재 유력한 위치추적방식인 GPS를 기반으로 한 위치추적서비스에서 문제가 되고 있는 도심 내에서 GPS음역지역 혹은 중계기가 다수 설치되어 있는 환경의 서비스를 보완할 수 있는 보완 솔루션으로서 적용하기에 매우 적합한 방식으로 볼 수 있겠다.
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.
16주간의 태극권 운동이 남자 고령자들의 건강체력 및 신체조성에 미치는 영향
Cheol Woo Kim(김철우) 한국생명과학회 2011 생명과학회지 Vol.21 No.8
본 연구는 65세 이상 79세 사이의 남자고령자를 대상으로 16주간의 태극권 운동프로그램을 통해 신체적, 생리적 변화를 살펴보았으며, 일상생활을 영위하기 위한 신체적, 생리적 건강의 척도가 될 수 있는 건강체력과 신체조성의 변화에 어떤 영향을 미치는지 그 효과를 분석한 결과 다음과 같은 결론을 얻었다. 건강체력 요인의 심폐지구력, 근지구력, 유연성, 평형성은 유의한(p<0.05) 영향을 미치는 것으로 나타났으며, 신체조성 요인의 이완기 혈압과 체지방, 제지방에서 유의한 영향을 미치는 것으로 나타났다. 태극권 운동프로그램이 고령화 시기에 건강체력과 신체조성 요인에서 긍정적인 변화를 가져옴으로써 건강체력관련 요인이 상당부분 개선된 것으로 나타났는데 이와 같은 긍정적인 변화는 남자고령자에 건강한 신체활동을 위해서는 체력을 증진, 유지시키는 것이 중요하다. 특히, 규칙적인 태극권 운동이 어느 정도 영향을 미치는지에 대한 생리학적 기전을 명확하게 규명하기 위해서는 연령별 및 성별에 따라 다양한 측면에서 검토 되어야 할 필요성이 있으며, 고령화 사회에 대비한 구체적이고도 현실적인 연구가 지속적으로 이루어져야 할 것으로 사료된다. Exercise has been shown to positively influence quality of life for elderly men with a wide variety of medical illnesses. Tai chi exercise, a slow and graceful form of exercise and meditation, has especially been offered as the ideal exercise for elderly men with diverse conditions, such as people suffering from chronic heart failure or breast cancer survivors. In one recent study, Tai Chi was found to improve exercise capacity, sleep stability, and quality of life in heart failure patients including elderly men. The purpose of the study was to examine the effects of 16 weeks of Tai Chi exercise (3 times/week, 60 min/trial, 40-50% HRR) on physical and physiological changes. Sixty four healthy volunteers without any particular disease between the ages of 65 and 79 years participated in the study. The results were as follows; Significant changes of cardiac endurance, strength, muscle endurance, flexibility and balance were observed following 16 weeks of Tai Chi exercise (p<0.05). In addition, significant changes of diastolic blood pressure, body fat and fat-free mass were observed following 16 weeks of Tai Chi exercise (p<0.05). These findings suggest that a brief period of Tai Chi exercise is beneficial, particularly to elderly men. It is especially beneficial for body composition, and physical fitness factors such as cardiopulmonary endurance, muscle endurance, flexibility, and balance. Further study is needed in this area for specific disease patients.