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부직포 균제도 해석을 위한 공분산-시장 함수의 유도(I) -1차원 영상 신호의 경우-
김주용,Kim Jooyong 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6
A method is introduced for deriving the 'covariance length curve (Cov-L)' from the existing variance length curve. Some critical information hidden in existing variance length curve will be revealed through the Cov-L derived. It includes the correlation between any arbitrary measurement lengths, which is not readily available from the variance length curve but that is critical. Correlation functions of arbitrary measurement lengths are derived directly from the variance length curve given without requiring any further information. Use of the correlation functions has more advantages over the traditional V-L curves. First, they represent a yarn diameter (or mass) profile both in scale (resolution) and frequency (periodicity) rather than in scale only which is the case for V-L curves. Second, periodicities hidden in seemingly irregular signals are easily detected and revealed by the correlation functions. It is also beneficiary that the functions are readily available from a V-L curve without further efforts for measurement and analysis.
기하학적 영상 처리를 이용한 나노 섬유 웹의 기공 분포 측정
김주용,이정해,임대영,변성원,Kim Jooyong,Lee Jung Hae,Lim Dae Young,Byun Sung Won 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6
An image processing algorithm has been developed in order to anlyze the nanofiber web images from a high magnification microscope. It has been known that precise pore detection of thick webs is extremely difficult mainly due to lack of light uniformity, difficulty of fine focusing and translucency of nanofiber web. The serial morphological image processing techniques of edge detection, dilation, opening, skeletonization and dilation have been applied to images for accurate pore detection followed by connect-component labeling for computing mean pore size and standard deviation of pore sizes. The pore detection algorithm developed has been found to show excellent performance in characterizing the porous structure, thus being a promising tool for the on-line quality control of eletrospun fiber manufacturing.
유한요소 시뮬레이션을 통한 지역난방열배관 특성 평가 및 강화이형관의 제안
김주용(Jooyong Kim),김호범(Hobum Kim),고현일(Hyun Il Ko),안영모(Yong Mo An),조종두(Chongdu Cho) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.4
This paper investigates the reliability of district heating pipes at thermo-elastic fatigue loading. District heating pipes, subjected to 120℃ and 16㎏f/㎠ due to water distributing service through inside the pipes, should endure long term cyclic thermal-mechanical loadings. The heating pipes are the co-centric tubes of steel pipe, poly urethane(PUR) insulator, and high density poly ethylene(HDPE) case. On installation, foam pad is externally wrapped for accommodating stress reduction near the bend sections of pipes. However, there have been frequent reports on the failures of bend sections in the middle of long term service. This study scrutinizes the observed failures near the bend sections through applying the finite element methods. Specially in this study, heating pipes are studied on the influence of foam padding on failures and proposed new designs for reinforced bend without foam pad.