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권영하 경희대학교 산학협력기술연구원 2005 산학협력기술연구논문집 Vol.11 No.3
The products designed by human sensibility and ergonomics are given good impression Especially the touch feeling on the human skin is very useful sensibility for Quality of products. Elasticity and viscosity of human skin is very important element in product design based on ergonomics. In this paper, we describe a sophisticated method for measurement of dynamic viscoelasticity characteristics of human skin. For this measurement, we developed a measurement system assembled with load cell, actuator, amplifier and data acqusition system. The MATLAB is used to analyze the data and fit a approximation curves.
권영하,장승호 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.6
The Hertzian contact theory is applied to the modeling of contact displacement of fingepad. This new numerical deformation model correlating the normal force and area of contact of the fingerpad by considering the fingerpad as elastic material can be used to predict the deformation of the fingerpad by the fabric. The relationship observed experimentally between the fingerpad displacements and the normal forces agrees with the numerical deformation model. The results show that the contact displacement is proportional to the normal force raised to the power of 2/3. Also the contact displacement equation between the fingerpad and fabric is represented using the rigid body motion and fingerpad deformation.
권영하 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.5
The governing equations were derived to determine the spring and viscous coefficients from experimental data by using the Maxwell model and the Voigt model. The high precision measurement system was designed to analyze the stress relaxation and creep phenomena in the thickness direction of fabric. The sample fabrics for men's winter suit were used to analyze the relation between the spring and viscous coefficients and hand values measured by the KESF system. The spring coefficients in the Maxwell model were evaluated to be 19 to 25 kN/㎡ and the viscous coefficients were from7.3 to 8.7 MNs/㎡. Fukurami related with the compressional property showed better relationship to the spring and viscous coefficients. These relationship fitted in well with Kawabata's results. In oder to anticipate the touch of fabric, it can be more useful to obtain the spring and viscous coefficients in the thickness direction using the Maxwell model than the Voigt model.
홀로그래피 간섭법을 이용한 터빈 블레이드의 미소변형 측정
권영하,박승옥,강대임 대한기계학회 1990 대한기계학회논문집 Vol.14 No.4
본 연구에서는 실시간법을 사용하여 터빈 블레이드가 회전할때 받는 원심력과 굽힘력에 의한 변형을 측정하였다.
디지털 영상 처리를 이용한 비접촉 3차원 인체 계측 기술의 자동화
권영하,최세환,허유,장승호 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-
Accurate 3-D body shape information is very important in the industrial and research fields such as clothing/garment design. Unfortunately, most available anthropometric data are composed of linear dimensions (lengths, heights, circumferences) which are Inadequate to represent the detailed body shape. This paper deals with the 3-D human body shape acquisition, representation at various view points and non-contact measurement of human body dimensions. For the 3-D shape date acquisition, a computer vision technique is used for laser sensing and image processing. This technique gives non-contact and automated measurements. We desire that this automated system should be put to practical use at the fitting room or garment sales market
레이저 길이 측정센서를 응용한 직물의 비접촉 표면 거칠기 측정
권영하,박경희,오경화,김은애 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.3
A surface roughness measuring system applying laser displacement sensor by a non-contact method is developed. The range of errors incurred by effect of colors is within 5%. In case of dark colors, particularly, error is reduced and on the contrary bright colors have higher possibility of errors. The SMD and heights measured by a non-contact method are increased as hairiness is increased. The difference between FFT analyzed surface roughness spectrum and densities of fabric along the warp and weft directions is within 15%. Laser displacement sensor is useful in measuring surface roughness by a non-contact method.