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직물구조가 신합섬직물의 역학적 특성에 미치는 영향(I)-직물밀도 및 감량가공이 전단특성에 미치는 영향-
서문호,Seo, Moon-Hwo 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.12
A new theoretical fabric shear model has been presented and a quantitative study has been conducted on the shear properties of polyethylene(terephthalate) (PET) fabrics of four different fabric densities and five different weight reduction. The fabric shear properties were measured with KES-F handle measurement system. From the theoretical and experimerntal studies. following results can be summarized : 1) The fabric shear behavior is strongly dependent on the fabric density and free volume available for the constituent yarns and their filament. 2) Shear hysteresis at the small shear angle(2HG) is dependent more on the yarn tensile properties than on the fabric structure. 3) Shear hysteresis at the shear angle, 5$^{\circ}$(2HGS) is dependent more on the interaction between two crossing yarns which is directly related on the fabric structure than on the yarn tensile properties.
정광남,김형섭,서문호,이유진,조광수,Jeong, Kwang-Nam,Kim, Hyung-Sup,Seo, Moon-Hwo,Lee, Yu-Jin,Cho, Kwang-Soo 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.6
The spinline behavior during electro spinning process was observed using high speed expose photography and line-laser scattering. The spinline was rotated with high speed around the nozzle after it was spun from the nozzle. Also it moved toward to the collecting plate at the same time. It resulted that the total spinline became similar to a bell shape having empty room inside. The electropsinning processing parameters such as concentration, applied voltage, air pressure and TCD showed significant influences on the spinline behavior.
김형섭,진동식,조광수,서문호,Kim Hyungsup,Jin Dong Sik,Cho Kwang-Soo,Seo Moon Hwo 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.4
The filtration behaviors of glass filters were studied by measuring the air permeability, pressure drop and SEM images of five HEPA grade filter material. Based on the observations, the filtration mechanism was described in terms of fiber diameter, packing density and filter depth. The results indicate that the finer fibers and fibers on/near the filter media surface show better filtration performance. Also the captured particles on the fibers formed dendrites, which influenced further filtration.
전기방사 공정 중 방사 거동에 미치는 전기전도도의 영향
오동기,김형섭,오정택,서문호,Oh, Dong-Ki,Kim, Hyung-Sup,Oh, Jung-Teak,Seo, Moon-Hwo 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.2
Electrospinning is one of the simplest methods for nanofiber fabrication. To investigate the effect of spinning solution conductivity on the spinning behavior and the web morphology, PEO was dissolved in two different solvents, $H_2O$ and ethanol. Also the conductivity of the PEO/water solution was controlled by adding NaCl. The study revealed that the spinnability became poor as the NaCl concentration increased when the applied voltage was lower than a certain level. However, the variance and the average of the fiber diameter decreased with the concentration. As the conductivity increased, the jet movement became more complex.
서문호,한영호,남문현 건국대학교 산업기술연구원 2006 건국기술연구논문지 Vol.31 No.-
The most distinctive feature of Jagyeongnoo is its simple and secure mechanisms devised for automatic audio-visual time announcing system. The Veritable Records Sejong Sillok suggested that special emphasis had been put upon signaling subdivided night-watches with mechanical logic operator. In this paper, the details of the night-watch signalling mechanism was described at full length. Through the recent reconstruction of the whole system of Jagyeongnoo which has been missing for several hundred years, the authors could discover the real ingenuity of Jang Yeong-sil displayed on the first Korean mechanical clockwork.
한영호,서문호,남문현 건국대학교 산업기술연구원 2006 건국기술연구논문지 Vol.31 No.-
The Automatic Striking Clepsydra Jagyeongnoo installed in the Time Announcing Pavilion Borugak was the first clockwork with time announcing mechanisms in Korea. In June of 1432 King Sejong ordered Jang Yeong-sil make a timekeeping apparatus, whose wooden figurines announce time signals automatically without human intervention. On July 1, 1434 Jagyeongnoo began to function as the Royal Court standard timekeeper. Among numerous parts only clepsydra vessels have survived up to the present and nothing of the time announcing mechanisms remains nowadays. The authors of this paper had recently reconstructed the whole system of Jagyeongnoo, including the time announcing mechanisms as well. The mechanical and functional details of the time-telling apparatus were described in this paper. The characteristic aspects of Jang's ingenious devices, such as float-rod and ball-rack mechanism, ball-relay mechanism, and twelve double-hour announcing mechanism, were evaluated at the viewpoint of history of technology.
폴리프로필렌 이형단면사 제조에서 방사조건이 이형도에 미치는 영향
윤문구,허정림,서문호 건국대학교 1997 學術誌 Vol.41 No.2
The influence of spanning condition on the shape factor of polypropylene profiled yarn was studied experimentally. Test spinning of polypropylene was carried out by utilizing a Y-shaped capillary die which has been designed to produce profited yarn. The types, of spring machine used for this study were both conventional undrawn yarn spinning and one-step spin-draw machine. From the experimental results, there was little differences in the shape factor between undrawn and drawn yarns. The shape of the yarn was mainly determined in the spinning process. Also, the shape factor of the drawn yarn produced from the spin- draw machine was greater than that of by conventional spinning and drawing two- step process. Anisotropy of surface tension in cross section of extrudates was responsible for the resulting shape factor. As the output rate and the fineness of yarn Increased, its shape factor decreased.