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핀형 열교환기를 적용한 자동차용 공조시스템의 성능특성에 관한 연구
홍경한,하옥남 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2
Fin-type heat exchanger has been tested in order to replace the heat exchanger of P.F-type which is now used in automobile air conditioner system. The comparative characteristics performance test and data analysis showed the following conclusion. Evaporator and condenser capacities and COP changed as the compressor speed, outdoor air temperature and air rate changed, which much influenced the air conditioner system. COP decreased as the outdoor air temperature goes up and compressor speed increases and the COP of Fin-type increased by 14% compared which taht of P.F-type. Comparative experiment showed that the Fin-type proved to be better than the P.F-type in overall performance. It is concluded that Fin-type is more efficient in terms of energy saving and engine power enhancement. The Fin-type is expected to be more favorable in near future.
蓄熱用 TMA 包接化合物의 熱物性에 關한 實驗硏究(II)
홍경한,한영옥,하옥남,김진흥 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2
This paper presents the test-tube experimental results of thermal properties of TMA clathrate compounds for latent heat storage applications. The results are ; TMA 25wt% clathrate compounds among the clathrate for various concentration, was found to have the most superior thermal property and when the heat source was -5℃, regarding the COP of refrigerator, 1) Phase change temperature was 5.3%. 2) Subcooling was 6.3℃. The subcooling of TMA clathrate decreased according to the temperature of decreasing heat source 3) Specific heat was 4.5kJ/kgK. 4) The latent heat of TMA 25wt% clathrate was the maximum 252.8kJ/kg. As subcooling can be lowered to 0.3℃, when the heat source is -15℃, continual study is needed to reduce the subcooling.
홍경한,전상신,이승재,박찬수,권일욱,김재열,김병철,하옥남 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.4
Fin-tube type(Fin-type) heat exchanger has been tested in order to replace the heat exchanger of parallel flow type(P.F-type) which is now widly used in automobile air conditioning system. The following conclusions are drawn by the comparison of the characteristics of the heat exchangers. Evaporator and condenser capacities and COP(Coefficience of performance) were varied as with the compressor speed, outdoor air temperature and air flow rate changed, which much influenced on the characteristics of the air conditioning system. Evaporator and condenser capacities were increased with increasing compressor speed and outdoor air temperature. Evaporator and condenser pressures of Fin- type were decreased by 7% and 5% respectively compared with those of P.F-type. The COP of Fin-type was decreased with increasing outdoor air temperature and compressor speed. The COP of P.F-type was decreased by 14% compared with that of Fin-type.
자동화 크레인 시스템을 위한 IEEE1451 기반 스마트 모듈 개발
하경남(Kyoung-Nam Ha),김만호(Man-Ho Kim),이경창(Kyung-Chang Lee),이석(Suk Lee) 한국항해항만학회 2005 한국항해항만학회지 Vol.29 No.3
항만 물류 시스템의 급속한 성장으로 인해 항만의 효율성을 증대하기 위한 자동화 크레인 시스템의 개발이 다양하게 진행 중이다. 자동화크레인은 통신 네트워크를 통하여 각종센서와 액츄에이터를 정밀 재어하게 되는데 이러한 시스템에 장착되는 네트워크 기반 스마트 모듈은 센서 신호획득 및 필터링 기능, 데이터 연산 및 통신기능이 한 보드상에 구축되어 있어 고장이나 프로토콜이 지원이 다른모듈을 사용할 경우 모듈 전체를 교체해야 되는 문제점이 발생하게 된다. 본 논문에서는 이러한 문제점을 해결하기 위해서 IEEE 1451 기반의 네트워크 독립적인 스마트 모듈을 제안하고 제안한 스마트 모듈의 성능을 평가하여 크레인 시스템에 적용 가능성을 확인하였다. Today’s port systems require larger and faster operation of transfer cranes in order to accommodate rapidly increasing traffic. These cranes need precise control of their components for operational efficiency. This paper presents an IEEE 1451 based smart module that allows numerous sensors and actuators of the crane to attach themselves to various networks more easily. The smart module has been experimentally evaluated on a CAN network for its performance.
박경하(Kyoung Ha Park),장현규(Hyun Kyu Chang),최선영(Sun Young Choi),한명식(Myoung Sik Han),최윤백(Youn Baik Choi),김남현(Nam Hyeon Kim),정행섭(Haing Sub R . Chung),허환(Hwan Herr) 대한내과학회 1999 대한내과학회지 Vol.57 No.1
Sclerosinng mesenteritis is a rare disease that occurs most often among middle aged man. Fewer than 200 cases have been reported in the literature. It is a benign mesenteric lesion characterized by fat necrosis, fibrosis and chronic inflammation. The pathogenesis of this disease is unclear through an autoimmune origin has been proposed. The disease is generally localized and self- limiting. Fatal case is rare but has been reported. In patients with biopsy proven sclerosing mesenteritis having a relentless downhill course, treatment with prednisolone and oral cyclophosphamide in isolated case report has lead to evident clinical and radiological responses. This is a report of a case of sclerosing mesenteritis, who presented to us with history of colicky abdominal pain and weight loss. She was treated with prednisone and intravenous cyclophosphamide pulse therapy and resulted in radiological and clinical improvement. Interestingly this case has associated with skin panniculitis and pleural thickening. The skin panniculitis also showed good response to prednisolone. Our case is the first in which sclerosing mesenteritis was associated with pleural thickening.