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- 저자 : 최해룡(Hae-Ryong Choi) (검색결과 6 건)
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전압리플 평균화를 이용한 새로운 MPPT기법에 관한 연구
최해룡(Hae-Ryong Choi),고재석(Jae-Seok Gho),최규하(Gyu-Ha Choe),김훙근(Heung~Geun Kim),신우석(Woo-Seok Shin) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Of two photovoltaic systems such as stand-alone type and utility interactive one, the utility interactive systems are so valuable for power peak-cut particularly in summer season. For the maximum power point tracking (MPPT) by which the generated energy can be maximized, many control methods have been reported up to now. To overcome the disadvantages of the conventional ones, a new MPPT algorithm is proposed which can improve both tracking ability and generating efficiency of photovoltaic system without chopper.
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고령자의 지역사회환경이 삶의 만족도에 미치는 영향: 여가활동과 건강상태의 순차적 매개효과
최해룡(Choi, Hae-Ryong) 한국노인복지학회 2021 노인복지연구 Vol.76 No.4
본 연구는 고령자의 지역사회환경이 삶의 만족도에 미치는 영향에서 여가활동과 건강상태의 순차적 매개효과를 검증 하고자 하였다. 분석대상은 2020년도 노인실태조사의 유효 표본수 10,097명 중 지난 1년 동안 여가활동(여행, 취미활동)을 경험한 고령자 7,957명이다. 통계분석은 SPSS 22.0 프로그램과 PROCESS macro v.3.5 프로그램 중 모델 6을 이용하였다. 여가활동과 건강상태의 순차적 매개효과의 유의성을 부트스트래핑 방법으로 검증한 결과, 지역사회환경이 삶의 만족도에 미치는 총 간접효과, 지역사회환경과 삶의 만족도의 관계에서 여가활동의 매개효과(지역사회환경→ 여가활동→ 삶의 만족도), 지역사회환경과 삶의 만족도의 관계에서 건강상태의 매개효과(지역사회환경→ 건강상태→ 삶의 만족도), 지역사회환경과 삶의 만족도의 관계에서 여가활동과 건강상태의 순차적 매개효과(지역사회환경→ 여가활동→ 건강상태→ 삶의 만족도)의 순차적 경로가 모두 통계적으로 유의하게 검증되었다. 이를 통하여 지역사회환경이 여가활동과 건강상태를 순차적으로 매개로 하여 삶의 만족도에 영향을 미친다는 것을 확인하였다. 따라서 본 연구의 결과에 기초하여 고령자의 삶의 만족도의 저하를 예방하거나 향상시킬 수 있는 실천 방안의 모색을 위한 시사점을 제안하였다. This study tried to verify the sequential mediating effect of leisure activities and health status in the effects of community environment on life satisfaction of the elderly. The subject of analysis is 7,957 elderly people who have experienced leisure activities(travel, hobbies) during the past year out of 10,097 valid samples of the 2020 survey on the elderly. For statistical analysis, model 6 of the SPSS 22.0 program and PROCESS macro v.3.5 program was used. As a result of verifying the significance of the sequential mediating effect of leisure activities and health status by the bootstrapping method, the total indirect effect of the community environment on life satisfaction, the mediating effect of leisure activities in the relationship between the community environment and life satisfaction (community environment→ leisure activities→ life satisfaction), the mediating effect of health status in the relationship between the community environment and life satisfaction (community environment→ health status→ life satisfaction), the sequential mediating effect of leisure activities and health status in the relationship between the community environment and life satisfaction (community environment→leisure activities→ health status→ life satisfaction) were all statistically significantly verified. Through this, it was confirmed that community environment affects life satisfaction by sequentially mediated leisure activities and health status. Therefore, based on the results of this study, implications for action plans that can prevent or improve the deterioration of life satisfaction of the elderly were proposed.
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CO₂아크용접기를 위한 3상 전압형컨버터의 입력역률개선
최규하,최해룡,김홍성 건국대학교 산업기술연구원 2000 건국기술연구논문지 Vol.25 No.-
Diode rectifier has been widely used as preregulator in CO2 arc welding machine, which has an advantage of low cost in application field. One of the demerits of diode-bridge rectifiers, is the line-current harmonic caused by the nonlinear nature of rectifier operation. As it is linked to power utility, a disorder of other instruments can be burst out, and the reactive power degenerates the total system efficiency The adoption of voltage source PWM converters can be considered and it must catch the compromise of system performance and cost. So, in this paper voltage source converters which have single and six control switch respectively, are analyzed and confirmed through digital simulation and experiments. In addition the improved input characteristics of CO2 arc welding machine known as low power factor system with nonlinear property, are shown and evaluated compared to conventional one.
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임창수,최해룡,정용구,박윤관,정흥섭,이훈갑,이기찬,주정화 대한신경외과학회 1988 Journal of Korean neurosurgical society Vol.17 No.6
Patterns of brain-stem compression and secondary brain-stem evoked postentials were investigated to correlate with expanding mass volume and location in mass-induced supratentorial brain compression in cats in which the subjects were divided into four experimental group i.e., frontal, temporal, parietal, and occipital brain-compressed groups. Postmortem inspection of the brain-stem showed either unilateral or bilateral dorsal herniation of the brain in frontal and temporal brain-compressed groups and dorsolateral herniation in parietal and occipital brain-compressed groups, respectively. Microscopic examination revealed that the secondary brain-stem hemorrhages were mostly caused by venous bleeding secondary to venous congestion, the bleeding being more severe in occipital brain-compressed group. As the intracranial pressure was raised by expansion of a supratentorial balloon, the late components of the BSEP were suppressed first, followed by the suppression of the early components. In BSEP recording. a significant change was observed in Vth wave with prolongation of latency and decrease in amplitude. This finding suggests that the midbrain is the most vulnerable to compression ischemia. In parietal group, the Vth wave started to be prolonged at 0.4㎖ of balloon expansion and totally disappeared at 1.8㎖ of expansion.
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