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최형철(Hyung Cheol CHOI),한창동(Chang Dong HAN) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
최근 전기 · 전자설비들은 통합화 · 자동화 진전으로 원격감시시스템의 도입이 증가 추세이고 기상이변에 따른 낙뢰의 증가로 인해 설비에 유입되는 뇌써지가 제어설비에 많은 피해를 발생시키고 있으며, 피해 발생 후 복구까지는 상당한 시간과 비용이 소요되고 있는 게 현실이다. 따라서, 낙뢰로부터 제어설비를 보호하기 위해선 인입전원단에서 부터 말단의 하부제어설비 까지 피뢰 · 접지시스템 조사 분석을 통해 피뢰, 접지방식 적정여부등을 파악하여야하며 원격감시설비 전단에 써지보호기(SPD) 적정설치여부가 제어설비를 보호하는데 최선의 방법이다. 본 논문은 제어설비를 낙뢰에 의한 써지로부터 보호하기위해 써지보호기(SPD)의 적정설치기준을 제시하고자한다.
기관근의 수축성에 대한 말초성 Benzodiazepine 수용체의 역할
류한영,최형철,최은미,손의동,이광윤,김원준,하정희,Rhyu, Han-Young,Choi, Hyung-Cheol,Choi, Eun-Mee,Sohn, Uy-Dong,Lee, Kwang-Youn,Kim, Won-Joon,Ha, Jeoung-Hee 대한약리학회 1997 The Korean Journal of Physiology & Pharmacology Vol.1 No.6
Non-neuronal high affinity binding sites for benzodiazepines have been found in many peripheral tissues including cardiac muscle and vascular smooth muscle, and have been designated as 'peripheral benzodiazepine receptor'. Benzodiazepines have been shown to induce relaxation of the ileal, vesical, and uterine smooth muscles. However, it is still unclear about possible involvement of peripheral benzodiazepine receptor on the contractility of trachealis muscle. This study was performed to investigate the role of the peripheral benzodiazepine receptor on the contractility of canine trachealis muscle. Canine trachealis muscle strips of 15 mm long were suspended in an isolated organ bath containing 1 ml of physiological salt solution maintained at $37^{\circ}C$, and aerated with $95%\;O_2/5%\;CO_2$. Isometric myography was performed, and the results of the experiments were as follows: Ro5-4684, FGIN-1-27 and clonazepam reduced a basal tone of isolated canine trachealis muscle strip concentration dependently, relaxant actions of RoS-4684 and FGIN-1-27 were antagonized by PK11195, a peripheral benzodiazepine receptor antagonist. Flumazenil, a central type antagonist, did not antagonize the relaxant action of Peripheral type agonists. Saturation binding assay of [3H]Ro5-4864 showed a high affinity$(Kd=5.33{\pm}1.27nM,\;Bmax=\;867.3{\pm}147.2\;fmol/mg\;protein)$ binding site on the canine trachealis muscle. Ro 5-4684 suppressed the bethanechol-, 5-hydroxyoyptamine- and histamine- induced contractions. Platelet activating factor (PAF) exerted strong and prolonged contraction in trachealis muscle strip. Strong tonic contraction by PAE was attenuated by Ro 5-4684, but not by WEB 2086, a PAF antagonist. Based on these results, it is concluded that the peripheral benzodiazepine receptor mediates the inhibitory regulation of contractilty of canine trachealis muscle.
오봉근(Bong-keun Oh),최교남(Kyo-nam Choi),최형철(Hyung-cheol Choi),임기조(Kee-joe Lim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Our company(KOWACO) has periodically performed off-line diagnostic test for 14 hydro generators (rated 11 ㎸ over) for 15 years. In this paper, we summarized results of dissipation factor tip-up test and partial discharge test about these generators. Among these, we chose two generators and performed insulation reinforcement (cleaning and varnish painting). We compared change of insulation condition for the stator winding based upon off-line diagnostic test result before and after repair. Test result shows that insulation condition was improved after insulation reinforcement. This insulation reinforcement has a function to reduce cause of deterioration, so we can know that it extends lifetime of generator and it is a very important factor for stable operation of facilities.
오봉근(Bong-Keun Oh),최교남(Kyo-Nam Choi),최형철(Hyung-Cheol Choi),임기조(Kee-Joe Lim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.5
Our company(KOWACO) has periodically performed off-line diagnostic test for 14 hydro generators (rated 11 kV over) for 15 years. In this paper, we summarized results of dissipation factor tip-up test and partial discharge test about these generators. Among these, we chose two generators and performed insulation reinforcement (cleaning and varnish painting). We compared change of insulation condition for the stator winding based upon off-line diagnostic test result before and after repair. Test result shows that insulation condition was improved after insulation reinforcement. This insulation reinforcement has a function to reduce cause of deterioration, so we can know that it extends lifetime of generator and it is a very important factor for stable operation of facilities.
수상태양광 발전시스템 개발을 위한 적지조사에 관한 연구
이성훈(Sung-Hun Lee),이남형(Nam-Hyung Lee),최형철(Hyeong-Cheol Choi),김진오(Jin-O Kim) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.7
Recently, interests in renewable energy have gradually increased. Photovoltaic system of various renewable energy is the most interest in power sources. Nowadays, the market of photovoltaic system is expected to be expanded due to the introduction of RPS(Renewable Portfolio Standard). Floating photovoltaic system is a new power system using the water surface above the dam and reservoir water. Floating photovoltaic system is different from the traditional approach to the development of solar power system causing problems such as environmental degradation. This paper investigates the analysis methods of suitable site for the development of floating photovoltaic system. The A,B,C as the optimal candidates were selected in hap cheon dam. The C is the best suitable site in A,B,C considering the expected power generation. Applied methods have effectively done to develop floated photovoltaic system.
덕유산국립공원 건강 숲 체험 프로그램이 스트레스 호르몬(코티솔)에 미치는 효과 분석
김희경(Hee Kyung Kim),손석준(Seok Joon Son),허영범(Young-bum Hur),최형철(Hyung-cheol Choi) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.5
Objectives: Stress hormone (cortisol) can be used to analyze psychological and physiological changes and healing effects before and after in blood and saliva. Here it is applied to scientifically validate the effects of the healthy forest experience in Deogyusan Mountain National Park. Methods: A healthy forest experience program was provided to college students (males and females) at Deogyusan National Park. Stress, hormones (cortisol), blood pressure, pulse, oxygen saturation and stress, anxiety, and depression were measured. This study was designed to objectively analyze the effects of stress hormones before and after. Results: Depression, stress, anxiety, and satisfaction with the forest experience program in Deogyusan National Park were very high in reliability in terms of Cronbach’s Alpha: depression scored 0.910, stress 0.558, anxiety 0.934, program satisfaction 0.826, and program effectiveness 0.894. Conclusions: In this study, we utilized the Healthy Forest Experience Program and the ‘Health and Medical Center Health Record Book’ of the Health Forest Experience Program (Ministry of Environment’s Environmental Education Certification Program). In the future, we will seek ways to utilize saliva since it is easier to collect than blood samples and apply the stress hormone cortisol as a saliva authentication program. In addition, by implementing ecological welfare programs in which nature and human beings coexist through systematic preservation and restoration, the national park management can utilize ecological, scenic and cultural services wisely. We expect to be able to provide exploration and welfare services.