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증발기의 길이 및 직경이 오일회수에 미치는 영향에 관한 실험적 연구
이성광(Sung Kwang Lee),강병하(Byung Ha Kang),김석현(Sukhyun Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This study has been conducted to investigate effects of tube diameter and length of an evaporator on oil return in a C02 Refrigeration system. The oil return is one of the most important characteristics for refrigeration oils. PAG is considered as a test fluids in this study. An evaporator model is employed to simulate the evaporator of a CO2 refrigeration system. Oil return characteristics has been investigated for CO2/PAG mixture in the range of tube diameter 1/4 to 1/2 inch and the tube length of 20 ㎝ to 30 ㎝. The results obtained indicate that oil return ratio is decreased with an increase in the tube diameter and length for PAG oil.
CO₂ 냉동시스템용 PAG오일과 POE오일의 항흡습성에 관한 실험적 연구
이성광(Sung Kwang Lee),강병하(Byung Ha Kang) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.6
This study has been conducted to select the suitable refrigeration oil for a CO₂ refrigeration system. Non-hygroscopic property of refrigeration oils is one of the most important properties for refrigeration oils. PAG and POE oils are considered as test oils in this study. Transient variation of water content of PAG and POE oils was measured for 3 different vessels in the environmental conditions, such as in the range of temperature 25℃ to 40℃ and relative humidity 40% to 85%. The results obtained that water content of both POE and PAG is increased with an increase in the contact area with ambient for 3 different vessels. It is also found that water content of both POE and PAG is increased as the ambient temperature and relative humidity is increased. Non-hygroscopic property of POE oil is found to be much superior than that of PAG oil.
심정지액을 이용한 개심술에 있어서 심근 ATP에 대한 실험적 연구
조성래,이성광,Jo, Sung-Rae,Lee, Sung-Kwang 대한흉부심장혈관외과학회 1980 Journal of Chest Surgery (J Chest Surg) Vol.13 No.1
This study was attempted to evaluate the effectiveness of cold cardioplegic solution [group B] compared with that of intermittent aortic cross clamping [group A]. 1. In group A, two dogs recovered spontaneous heart beat without using defibrillator and one case was used defibrillator once. In group B, four dogs recovered the spontaneous heart beat even without defibrillator and in one animal the defibrillator was used three times. 2. There was no significant difference in serum electrolyte [Na+, Ca2+, Cl- ] between group, but K+ level was decreased in both group. 3. The group A showed more increasing in serum LDH activity than group B. 4. The postoperative myocardial ATP level was $2.35{\pm}0.10$ ${\mu}$M/Gm. of wet weight in control group, $1.46{\pm}0.16$${\mu}$M/Gm. of wet weight in group A [60.2% of control group], and $1.80{\pm}0.14$${\mu}$M/Gm. of wet weight in group B [76.8% of control group].
성시찬,우종수,이성광,Sung, Si-Chan,Woo, Chong-Su,Lee, Sung-Kwang 대한흉부심장혈관외과학회 1979 Journal of Chest Surgery (J Chest Surg) Vol.12 No.3
Neurofibromatosis [Von Recklinghausen`s disease] is a rare Mendelian dominant disease, which shows multiple generalized symptoms and signs at various sites [Ex Skin, Bone, Nerve, Endocrine, Mediastinum rarely Lung, etc.]. We experienced one case of neurofibromatosis which has typical skin lesions [cafe-au-lait, multiple nodules, axillary freckling] with neurofibrosarcoma [malignant change from mediastinal lesion]. Patient was admitted our department because of recently developed severe dyspnea which was probably due to main tracheal compression by mediastinal neurofibrosarcoma. After successful removal of mediastinal mass dyspnea disappeared completely. Patient`s postoperative course was uneventful, and the patient was discharged 14 days after operation.
조성래,박동식,이성광,Jo, Sung-Rae,Park, Dong-Sik,Lee, Sung-Kwang 대한흉부심장혈관외과학회 1979 Journal of Chest Surgery (J Chest Surg) Vol.12 No.2
Primary intrathoracic neoplasms occur frequently, and the most frequent intrathoracic tumors are of pulmonary or bronchogenic origin. Second in frequency are mediastinal tumors, and least frequency or comparatively rare are the neoplasms arising from the wall of the thorax and extending into the thoracic cavity. Of all intrathoracic tumors, fibroma is extremely rare. Recently, we have experienced a huge rapid growing intrathoracic fibroma originating from thoracic wall, which is removed successfully and confirmed histopathologically. Authors present one case of fibroma and discussion with a brief review of the relevant literatures.
오일 분리기에서 CO₂/PAG오일 혼합물의 오일 분리특성에 관한 실험적 연구
김경재(Kyung Jae Kim),이성광(Sung Kwang Lee),조은영(Eun Young Cho),강병하(Byung Ha Kang),김석현(Suk hyun Kim) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The oil separation in an oil separator is one of the most important characteristics for proper compressor operation. In this study, a gravity type of oil separator is used. Oil separation characteristics has been investigated for CO2/PAG mixture in the range of oil concentration 0 to 5 weight-percent and the mixture temperature range of 0℃ to 15℃ and 70℃ to 90℃. The results obtained indicate that the oil separation is increased with an increase in the oil concentration. It is also found that the oil separation in liquid state is increased with an increase in the mixture temperature while the oil separation in gas state is decreased.