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Nylon 6-ran-Nylon 4 공중합물 섬유의 구조와 물성 (I)
조현혹,전주완,이민희,이선희,권순택,Cho, Hyun-Hok,Jeon, Ju-Wan,Lee, Min-Hee,Lee, Sun-Hee,Kwon, Soon-Taek 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.3
The effects of drawing on the structure and physical properties of nylon 6-ran-nylon 4 copolymer filaments were assessed by uniaxially drawing filaments at various ratios at 90 DC and measuring their crystal structure, birefringence, moisture regain, dynamic viscoelasticity, thermal behavior, and tensile properties. X-ray diffraction curves showed sharper peaks with increasing draw ratio. Birefringence and heats of fusion (${\Delta}H_m$) increased with increasing draw ratio, while a slight decrease in moisture regain was observed. The intensity of the $tan{\delta}$ peak decreased and its position shifted towards higher temperatures with increasing draw ratio. Breaking strength increased and breaking elongation decreased with increasing draw ratio.
교량 및 수로 조건에 따른 선박충돌 위험도 분배모델의 적용
이성로 ( Lee Seong-lo ),배용귀 ( Bae Yong-gwi ),전주완 ( Jeon Ju-wan ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In the standards or regulations mentioned regarding the ship collision against bridge, acceptance criterion about collapse risk is given to bridges exposed to ship collision. It recommends to distribute collision risk through moderate method as well as to determine the analysis domain considering the ship characters and local circumstance. According to the criteria collision risk should be distributed within three times of ship’s overall length which is based on historical accident data, and besides, the summation of annual frequency of all bridge components should be equal to annual frequency of entire bridge. In this study, methodological study regarding the annual frequency of between bridge components and entire bridge is preformed and its reasonable correlation is presented considering the ship characters, bridge layout, local circumstance, and so on.
이성로 ( Lee Seong-lo ),배용귀 ( Bae Yong-gwi ),전주완 ( Jeon Ju-wan ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In the standards or regulations mentioned regarding the ship collision against bridge, acceptance criterion about collapse risk is given to bridges exposed to ship collision. It recommends to distribute collision risk through moderate method as well as to determine the analysis domain considering the ship characters and local circumstance. One general method distributing the collision risk is based on replacement cost of structure and other methods considering the importance of bridge element or accessibility of ship are available. In this study, distribution method based on replacement cost of the structure and allocation weights previously calculated from ship collision risk assessment of appropriate structure are applied. Especially, rational distribution model considering the ship characters and bridge layout is presented through the investigation of previous studies related to geometric probability which is a meaningful factor of the annual frequency of collapse.