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정기봉,배한조,권오현,김무한,전순용,한성수 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.12
For a false twisting process, the normal force occurring at the contact point of the belt is the main parameter which influences the variation in the yarn properties. In other words, the properties of the textured yarn are influenced by the tension of the belt. Thus the false twisting section(composed of belts) is the most important part of the false twisting machine. The traditional method employing compressing pumps cannot control the variation of air pressure in real-time mode and the accuracy and/or sensitivity are very low. The purpose of this paper is to develop a control algorithm, a control hardware, and a monitoring program for the new yarn tension control method. i.e., a step motor method. The incorporation of step motors allowed very accurate and sensitive real-time control of the yarn tension. Thus It was possible to control the tension and minimize the possible error. And it was also easier to obtain the perfect grip by minimizing slippage occurring in the belt section caused by the protrusion due to uneven pressure at the contact point possible in the air grip method.
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최소자승 NURBS 근사법을 이용한 인체 단면곡선 생성
한성수,배한조,박정환,권오현,Han Sung Soo,Bae Han Jo,Park Jung Whan,Kwon Oh Hyun 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.5
The paper proposes a method of constructing the three-dimensional CAD model from digitized cloud-ofpoints data of the human body, thereby automatically extracting several featured dimensions. The main steps are; segmentation, sectioning, fairing and surface approximation. In segmentation process the input three-dimensional set of points are grouped into each functional part of the human body by searching the boundary points when being viewed from a certain direction. The next step slices the grouped points to obtain section curves which will be faired (smoothed) by the difference-fairing method. Each faired section curve (a set of points) is approximated to the NURBS form by use of well known method, from which we can construct a NURBS surface. The parametric surfaces for functional parts of a human body are interrogated to extract several featured dimensions of a human body.
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NCO 지수와 숙성 조건에 따른 무용제형 폴리우레탄 인조피혁의 물리 화학적 특성에 관한 연구
은종현,이준석,유호욱,배한조 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.2
In this study, we investigated the chemical and physical properties of polyurethane artificial leather. Polyurethane artificial leather was prepared from polyol, diisocyanate, a chain extender, a catalyst, and nylon circular knit fabric. After manufacturing the artificial leather, the properties of six different samples were investigated according to their NCO index and ripening temperature. The equivalence ratios of the isocyanates (NCO) to polyols containing a hydroxyl group are referred to as the NCO index. Samples with an NCO index of 1.0, 1.4, and 1.8 were synthesized by changing the weight ratio of diisocyanate. Polyurethane artificial leathers were synthesized by varying the ripening temperature at room temperature and 60 °C. As the NCO index increased, the number of unreacted NCO functional groups increased, thereby improving the physical properties of polyurethane artificial leathers. When the samples were prepared at a ripening temperature of 60 °C, the surface of the polyurethane artificial leather changed, and the physical properties improved.
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