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송성기 江南大學 不動産學科 1988 不動産學報 Vol.4 No.-
금번 RE 연구회에서 재개발 사업의 연구, 조사의 일원으로 현재 재개발이 실시되고 있는 상계동 지역을 탐방하게 되었다. 우리는 상계동 지역의 재개발 실태와 그 재개발 사항에서 빚어지는 문제점들을 발견하고 그 원인과 해결 방안들을 생각하게 되었다.
Fracture Strength of Borosilicate Glass Melt Infiltrated Zirconia 3-Unit Bridge
송경우,박일송,신귀수,류성기,이민호,배태성 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
This study examined the fracture strength of 3-unit all-ceramic zirconia bridges treated with a melt-infiltration process of borosilicate glass. The zirconia specimens were milled with presintered yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) blocks. Before veneering the porcelain, borosilicate glass was infiltrated into the zirconia at 1,100oC for 1 hr. A 3-point flexural test was carried out at crosshead speed of 0.1 mm/min. The fracture surface and interface between the zirconia and veneer porcelain were observed by scanning electron microscopy. The fracture strength of the Y-TZP specimens was increased significantly by the melt-infiltration process of borosilicate glass (P < 0.05). The bond strength of the porcelain on zirconia was also improved significantly by meltinfiltration process of borosilicate glass (P < 0.05). The resistance to the initial chipping of the veneered porcelain in the 3-unit allceramic zirconia bridges was increased significantly by melt-infiltration process of borosilicate glass (P < 0.05). According to the microscopic observations of the fracture surface of porcelain, the glass-infiltrated zirconia group showed a rough fracture surface,whereas the sintered zirconia group showed a smooth fracture surface containing many pores.
Experimental research on thermal comfort in the university classroom of regular semesters in Korea
정근주,송성기,안영철,오근숙,임영빈 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.2
This research has investigated physical variables affecting indoor thermal comfort and subjective responses of thermal comfort of students in a university in Korea in which the weather is oceanic temperate climate, and has been performed to contribute to the research fields of Sustainable Thermal Standard and Adaptive Thermal Comfort (ATC). This research is based on the ISO 7730-2005 standard and the ATC theories and 4 main variables of PMV such as dry bulb temperature (Ta), relative humidity (RH), black bulb temperature (Tg), and air velocity (Va) are measured once a week during two regular semesters. A clothing insulation, a thermal sensation vote (TSV),an acceptability of thermal environment, and a preference for cooling and heating are investigated at the same time using a questionnaire. This study was carried out for 26 weeks during the spring season, from March to June 2009, and the autumn season, from September to December 2009. The main achievements of this study are as follows. Monthly Mean Outdoor Temperature (MMOT) and Operative Temperature (OT) in the classroom during research periods are 7.4~23.3°C and 17.5~29.0°C, respectively. The acceptability ratio of thermal environment shows over 80% when the range of OT in the classroom is 17~25°C, and the range can be applicable to operative index of heating and cooling of classroom. The mean TSV of respondents is almost “neutral (0)” when the PMV in the classroom moves to “neutral (0)” and “slightly cool (-1)”, and the TSV is almost “+1.5” when the PMV moves to “slightly warm (+1)”. The acceptability ratio of thermal environment is slightly different from ASHRAE Standard 55-2004. So it is necessary to more investigate standard range of acceptability of thermal environment in oceanic temperate climate region using much more databases.
Pseudomonas aeruginosa에 의핸 생합성되는 향진균성물질(PAFS)의 생산성 증가 및 생산균주의 배양생리학적 특성 연구
박선옥,송성기,윤권상,정연호,이상종,정용섭,전계택 한국미생물 · 생명공학회 2000 한국미생물·생명공학회지 Vol.28 No.6
Selection of high producer strain, optimization of production medium and cultivation in bioreactor system were carried out in order to produce an antifungal substance, PAFS in large amounts which sources and 41 kinds of nitrogen sources, a synthetic medium consisting of fructose(70 g/1) and ammonium sulfate (10g/l) and a complex medium including galactose(30g/l), fructose(20g/l) and cottonseed flour(35g/l) were determined as opti-mized media for PAFS production. In bioreactor studies examining physiological characteristics of the pro- ducer microorganism with the complex medium, typical pattern of diauxic growth was observed as demonstrated by the result that fructose was not used before almost exhaustion on readily utilizable carbon source, galactose. When galactose was supplemented additionally during the fermentation period. PAFS pro-ductivity did no increases any more, indicating that large portion of the added galactose was used for cell growth instead of biosynthesis of the secondary metabolite. It was deduced that PAFS production could be enhananced by employing fed-batch operation in order to overcome the apparent phenomenon of catabolite repression and /or inhibition.