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이용주,강나영,차지은,이지민,이도영,김형진 한국펄프·종이공학회 2023 펄프.종이기술 Vol.55 No.4
Fractal geometry is characterized by its similarity and hierarchical organization. It exhibits a hierarchical structure composed of elements that share the same shape but vary in size, ranging from the largest to the smallest. In this study, the fractal-dimension values of a paper and paperboard were calculated, which reveal distinct properties of fractal dimensions in contrast to Euclidean geometry. The variogram method was employed to characterize the surface roughness profiles using fractal-dimension analysis to obtain the fractal dimensions of paper products. A decrease in the fractal-dimension value was observed following the coating process. These findings imply the promising applicability of fractaldimension analysis for evaluating the effects of postprocessing techniques, including printing, coating, creping, and embossing. .
Fractal Dimension for Morphology Analysis of Rubbed Surface with Hydraulic Members
Cho, Yon-Sang,Seo, Young-Baek,Park, Heung-Sik Korean Tribology Society 2002 KSTLE International Journal Vol.3 No.2
The surface morphology of oil-lubricated surfaces fer hydraulic piston motors is believed to be extremely effective in contact mechanics, adhesion, friction and weak In order to describe morphology of various rubbed surfaces on driving conditions, the wear test was carried out under different experimental conditions in an oil-lubricated system. And fractal descriptors were applied to rubbed surfaces of hydraulic members and analyzed through an image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimensions can be determined by sum of intensity difference of surface pixel. The morphology of rubbed surfaces can be effectively obtained by fractal dimension.
Application of Fractal Dimension for Rubbed Surface Morphology of Hydraulic Members
M. R. LUY,S. J. JUN,Y. S. CHO,H. S. PARK 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
The surface morphology of oil-lubricated surface for hydraulic piston motor is believed to be extremely effective in contact mechanics, adhesion, friction and wear. In order to describe morphology of various rubbed surface on driving condition, the wear test was carried out under different experimental conditions in oil-lubricated system. And fractal descriptors was applied to rubbed surface of hydraulic members with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Morphology of rubbed surface can be effectively obtained by fractal dimension.
레이저 경화면의 형상특징 해석을 위한 프랙탈 차원의 적용
옥철호,조연상,배춘익,박흥식,전태옥 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.2
The determination of surface topography is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe topography of various frictional surface, the harding test was carried out under different experimental conditions in dry friction. And fractal descriptors was applied to frictional surface of laser modified steel with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Topography of frictional surface can be effectively obtained by fractal dimensions.
조연상,류미라,김동호,박흥식 한국트라이볼로지학회 2002 한국윤활학회지(윤활학회지) Vol.34 No.1
The morphological analysis of wear particle is a very effective means fur machine condition monitoring and fault diagnosis. In order to describe morphology of various wear particle, the wear test was carried out under friction experimental conditions. And fractal descriptors was applied to boundary and surface of wear particle with image processing. These descriptors to analyze shape and surface of wear particle are shape fractal dimension and surface fractal dimension. The boundary fractal dimension can be derived from the boundary profile and surface fractal dimension can be determined by sum of intensity difference of surface pixel. The morphology of wear particles can be effectively obtained by two fractal parameter.
프랙탈 차원을 이용한 기계습동재료의 마멸입자 형상특징 해석
박흥식,김영희,전태옥,문병주,조연상 동아대학교 생산기술연구소 2001 生産技術硏究所硏究論文集 Vol.6 No.2
The morphological analysis of wear particle is a very effective means for machine condition monitoring and fault diagnosis. In order to describe morphology of various wear particle, the wear test was carried out under friction experimental conditions. And fractal descriptors was applied to boundary and surface of wear particle with image processing. These descriptors to analyze shape and surface of wear particle are shape fractal dimension and surface fractal dimension. The boundary fractal dimension can be derived from the boundary profile and surface fractal dimension can be determined by sum of intensity difference of surface pixel. The morphology of wear particles can be effectively obtained by two fractal parameter.
전성재,조연상,김동호,박흥식 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
It is known that fractal theory has recently been used as a useful in the characterization of surface texture and the understanding of tribological phenomena such as friction, wear and lubrication. The fractal-based method for describing the rubbed surface texture has roused great interest. In this paper, the fractal descriptors was applied to rubbed surface of hydraulic driving material with image processing system in order to describe morphology of the rubbed surface. The results showed that the fractal dimension can be determined by sum of intensity difference of surface pixel. The two step size to get fractal dimension is similar to surface roughness Ra. Fractal dimensions of the rubbed surfaces increase with an increase of applied load. Morphology of the rubbed surface driving in lubricant can be effectively obtained by fractal dimensions.
프랙탈 차원을 이용한 재료손상의 자기 상사성에 관한 연구
조석수,주원식 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.1
The postion and the length of surface micro-crack has random properties. It is difficult to detect the progressive changes in surface micro-crack distribution that occur during fatigue stressing. In this paper to overcome this problem, fractal dimension was introduced to characterized the change in two-dimensional surface micro-crack distribution during fatigue process. Box counting method was adopted to measure the fractal dimension. The features of surface micro-crack growth and coalescence have fractal property. Fractal dimension increases with the number of cyclic load. Remaining fatigue life of mechanical components can be predicted by the relation between fractal dimension and cycle ratio to fracture. Therefore, we proposed complex system design that uses fractal dimension in material design and structure design and safety estimation.
Fractal Approach to Passivated Surface of Stainless Steel
Jung-Ho Heo,Yong-Heon Leeb,Heon-Cheol Shin 한국표면공학회 2010 한국표면공학회지 Vol.43 No.1
The morphology of the passivated surface of stainless steel (SS) was quantitatively characterized based on fractal geometry. In particular, the surface irregularities of the passivated 304 and 439 SSs were comparatively analyzed in terms of their self-similar fractal dimensions. The passivated surface of 439 SS in an acid-based electrolyte proved to have a higher fractal dimension, as compared to that of 304 SS, esp. at a scale of several tens of nanometers, strongly indicating the higher irregularity of the passivated surface. It is anticipated that the fractal approach suggested herein might be effectively utilized to analyze the irregularity of the steel surface and/or the compactness of the oxide film.
Corrosion Resistance of Stainless Steels Analyzed by Fractal Geometry
Kim, Eun-Ji,Park, Su-Jin,Heo, Jung-Ho,Shin, Heon-Cheol The Korean Electrochemical Society 2010 Journal of electrochemical science and technology Vol.1 No.2
Fractal property of the passivated steel surface was investigated on the basis of scaling analysis with a special focus on its relationship with corrosion resistance. For this purpose, the surface of stainless steel was intentionally oxidized under a variety of passivation conditions and its scaling property was analyzed by a triangulation method. The morphology of the passivated steel surface was satisfactorily evaluated with fractal dimension. From the chronoamperometry and impedance measurement, it proved that lower fractal dimension leads to more enhanced corrosion resistance. The higher passivity of the steel surface with lower fractal dimension was discussed in terms of active area and structural imperfection.