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후지체공 흰쥐에서 가자미근과 내측비복근의 기계적 특성 및 MHC 단백질의 변화
이재효,이문영,이성호 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.1
The present study was designed to evaluate the changes of mechanical properties of contraction and myosin heavy chain (MHC) protein in the soleus and medial gastrocnemius muscles following hindlimb suspension in rats. After 14 days of hindlimb suspension, contraction time, half relaxation time, maximum twitch tension, maximum tetanic tension and fatigue index were measured in the soleus and medial gastrocnemius muscles, also MHC was measured in those muscles by means of immunohistochemical study. Body weight and muscle weight were decreased significantly in hindlimb suspended rats. In hindlimb suspended rats, mechanical properties including contraction time, half relaxation time, maximum twitch tension and maximum tetanic tension were decreased significantly and muscle fatigue was increased, which was more prominent in the soleus muscle than the gastrocnemius muscle. MHC type Ⅰ was decreased significantly and MHC type Ⅱx which was not observed in control was increased in the soleus muscle following hindlimb suspension, which represented that the slow muscle fibers converted to the fast muscles fibers. In the medial gastrocnemius muscle following hindlimb suspension, MHC type Ⅰ and type Ⅱx were decreased significantly and MHC type Ⅱb was increased significantly. These results suggest that MHC of the slow muscle fibers converted to MHC of the fast muscle fibers during hindlimb suspension, which was corresponded to changes of mechanical properties of contraction.
열펌프의 난방운전시 외기온이 압축기의 냉매거동에 미치는 영향
이재효,김병균,이건우 대한설비공학회 2004 설비공학 논문집 Vol.16 No.5
The major cause of compressor failure is the decrease of oil viscosity due to floodback. In most previous researches on the compressor reliability, the relationship between oil circulation rate and performance or oil viscosity has been studied. Another research topic is flow visualization by using a sight glass on the bottom of a compressor sump area and accumulator. Both oil film thickness and oil level through the sight glass should be assessed for compressor reliability if the oil content of the mixture is small and low viscosity raise poor lubrication of pump bearing. In this study, the compressor reliability was assessed by measuring the viscosity of the mixture and calculating oil film thickness. The analysis of the relationship between bottom shell super heat and oil film thickness at heating operation was performed. It is concluded that bottom shell superheat does not perfectly stand for the mixture's behavior for a low ambient heating operation and oil film thickness can give more detailed and direct criteria for compressor reliability.
이재효,조성철,김태헌 대한설비공학회 2003 설비공학 논문집 Vol.15 No.6
The purpose of this study was to reduce the noise emitted from the package air-conditioner. The optimum design methods of the fans ware investigated experimentally through the analysis of noise problem caused by the conventional PAC system. New PAC system had decreased 6 dBA in overall noise level as compared with the conventional system by various technology.