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소형 냉각시스템에서의 R-436b 냉매 적용에 관한 연구
진병주(Byoung Ju Jin),고정수(Jung Su Koh),오주철(Ju Chul Oh),이재호(Jae Ho Lee) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
This study analyzes the performance and feasibility of alterative refrigerant R-436b using on the small sized cooling system. Environmental friendly refrigerant R-436b was used current cooling system for test. And systems were operating under actual using conditions by costumers. Until the systems were recovered, they were operating cooling system and any changes of their parts. We are analyzed refrigerant component ratio, cooling performance and inspected the compressor parts. After the system was installed, cooling performance appears to be almost equivalent level to the initial system and its parts still remained in good condition. Considering these results, it is deemed possible to apply environmental friendly refrigerant R-436b to the current small sized cooling system. The results of these studies are used as the basic performance data for the development of environmental friendly refrigerants.
오한석(Han-Seok Oh),한상정(Sang-Jeong Han),장주민(Ju-Min Zang),이해경(Hae-Kyung Lee),심주철(Joo-Chul Shim),김우형(Woo-Hyung Kim) 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.4
The purpose of this study is to understand anxiety in patients undergoing third molar extraction and care patients of third molar extraction. The subjects in the study were Sixty-three patients who visited the department of dentistry at Pusan Paik Hospital from May 2006 to September 2006 and who underwent third molar extraction. Patients’anxiety(state anxiety and trait anxiety) to use Spielberger’s state-trait anxiety inventory(STAI) were measured. They were asked to fill out STAI question paper immediately before third molar extraction(pre-extraction) and on the day after the extraction(post-extraction). And visual analog scale(VAS) to measure patient’s postoperative pain on the day after extraction(postextraction day) was used. Then Differences in anxiety before and after extraction, between men and women, between the first and second extraction, with impacted versus nonimpacted third molar extraction, between extraction time and anxiety, and between postoperative pain and anxiety were evaluated. The anxiety status of patients undergoing third molar extraction could be quantitatively evaluated using the STAI-KYZ. There were significant difference before and after third molar extraction. Especially women and patients of more severe postoperative pain was more anxious. We need to alleviate patient’s anxiety(especially women) and to control postoperative pain throughout the tooth removal process.
대체냉매 R436B를 적용한 정수기 냉각수 시스템 신뢰성 평가에 관한 연구
남현규(Hyun-Kyu Nam),배상은(Sangeun Bai),배철호(Cheol-Ho Bai),고정수(Jung-Su Ko),진병주(Byung-Joo Jin),오주철(Ju-Chul Oh) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.8
The alternative refrigerant R436B is applied, to assess the application feasibility for a commercial cooling water system. The characteristic stability was verified by Sealed glass tube test and Autoclave test. R436B is chemically stable with the compressor material. The Oil miscibility test shows the usual compressor oil mixed well with R436B. Through the life acceleration test, the cooling performance is maintained. Though slight changes in oil and capillary tube diameter were found, they were within the permitted range. R436B should be applied to commercial cooling water systems as a simple replacement for the usual refrigerant.