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박명수,신현세,최재우,Park, Myeong-Su,Sin, Hyeon-Se,Choe, Jae-U 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.2
In order to fond the relations between the warmth retaining property and the thermal behavior of fiber assembly, we studied the warmth retaining properties by supplying 50kca1/m2h of heat, which is the same amount of heat released from human skin. Applying a numerical analysis of finite-element method, we examined the thermal behaviors of the fiber assembly by changing both the air content ratio and the thickness of the sample. The results were as follows. When the sample thicknesses were thicker than 20mm, the thermal equilibrium times were found to be effected greatly by the variation of the air content ratio. However, when the sample thicknesses were less than 20mm, it was found that the thermal equilibrium times ware essentially independent of the air content ratio. The temperature gradients of the thermal behaviors showed increasing tendencies near the heat source. When the air content ratio was flexed at 40%, the effective heat conductivity was kept decreasing with the thickness even at the thicknesses of 10mm and mote. However, at the air content ratio of 60%, the effective heat conductivity decreased with the thickness until the thickness became 10mm and became almost constant with further increase of the thickness.
CONTENTS PRISM - e-Biz Expo 2003 참관기
박명수,Park, Myeong-Su 한국데이터베이스진흥원 2003 디지털콘텐츠 Vol.10 No.-
지난 9월 16일 삼성동 COEX에서는 산업자원부와 한국전자거래협회의 주최와 주관으로 4일간에 걸쳐서 'e-Biz Expo 2003'이 진행됐다. 이에 국내 전통기업과 온라인 기업간의 만남의 장을 통해 e-비즈니스 활성화를 유도하고자 했던 'e-Biz Expo 2003' 전시회와 컨퍼런스를 정리해 보고자 한다.
박명수,Park, Myeong-Su 한국데이터베이스진흥원 1999 디지털콘텐츠 Vol.7 No.-
웹사이트들을 서핑하다 보면 어디 가나 빠지지 않고 있는 메뉴가 있다. '회원가입'이 바로 그것인데 예전에 비하여 눈에 띄게 늘어난 이 '회원가입'은 도대체 멀 위해 생겨난 기능이며, 도대체 '회원가입'을 받아서 무엇을 하려는 것일까?
Nylon 6의 구조변화에 관한 연구(I) -등온열처리하여 연신한 Nylon 6 Film의 결정t구조에 대하여-
박명수,이성우,장동호,Park, Myeong-Su,Lee, Seong-U,Jang, Dong-Ho 한국섬유공학회 1984 한국섬유공학회지 Vol.21 No.5
The crystal form, weight fraction of γ-α form, crystallinity, crystallite size and initial modulus of nylon 6 film which had drawn at various temperatures (100, 120, 140, 160, 180, 200, 220℃) and times (1, 5, 30, 60, 180min.) were measured by WAXD, density gradient method and tensile test. Below 160℃ of annealing temperature γ crystals were formed and above 200℃ α crystals were formed prominently. By drawing γ crystals were changed to α crystals. It was considered that, by drawing, the molecular chain of γ crystals which were twisted slightly to the molecular axis was stretched (16.88Å→17.2Å) and the hydrogen bond which had been conformed in the parallel intermolecular chain was reformed in the antiparallel intermolecular chain. The drystallinity and the crystallite size were increased with the annealing temperature and the treating time. At the each annealing temperature, the increasement of crystallinity and crystallite size was almost saturated above the treating time of 60 min. The initial modulus was also increased with the annealing temperature and the treating time. By drawing it was increased more remarkably. It can be explained by the Peterlin's model of plastic deformation and fibril structure.