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김희삼 ( Hee Sam Kim ),김미선 ( Mi Sun Kim ),이영희 ( Young Hee Lee ) 한국산업융합학회 2005 한국산업융합학회 논문집 Vol.8 No.1
This study was performed to analysis the operation process when fabric pattern design was done by the use of CAD system compared with the manual work in order to determine the operation efficiency with the application of fabric design CAD system. The results of the study were as follows: l.since 160,000 colors were supported by CAD system, color proposed by consumer was able to match exactly according to the its design. However, exact color matching was not possible by manual work. 2. Woven state of back of pattern design could be identified simultaneously with face of it for CAD system, while face and back of the fabrics should be designed separatedly in case of manual work. 3. Since the combination of warp and filling yam was compatible with the fabric density in one repeat unit in CAD system, exact size of pattern design to be woven was able to expressed. 4. Only simple graphical expression by manual work was seen, while with the CAD system, texture and shade effect as well as graphical expression could be expressed and so fault could be reduced in advance with the simulation of actual feeling of fabrics in the screen. In conclusion, when CAD system will be introduced to the textile industry, operation time of designing pattern can be reduced. Since the operation is easy and simple, a beginner can operate CAD system easily. Thus, production and wage costs can be saved and this can be related directly with the improvement of productivity which is the main purpose of introducing CAD system.
클로로포름을 사용한 전기방사법에 의한 고분자량 폴리비닐카바졸 웹의 제조 및 특성(2)
김희삼(Hee Sam Kim),김채성(Chae Sung Kim) 산업기술교육훈련학회 2014 산업기술연구논문지 (JITR) Vol.19 No.3
In this study, adapting high molecular weight PVCz and controlling three major parameters for electrospinning, we successfully prepared novel PVCz fibrous webs. SEM images showed that the structure and morphology of electrospun PVCz webs depended on processing parameters such as solution viscosity(e.g. concentration and polymer molecular weight), AV, TCD, and the type of solvent. Concentration of poly(N-vinyl carbazole) (PVCz) solution was varied from 3 to 18 wt(%). All electrospinning procedures were carried out at 25 °C room temperature. Applied voltage was ranged from 15 to 30 kV. Tip-to-collector distance(TCD) was varied from 10 to 40cm. In the cases of, using chloroform as a solvent, the fiber diameters in the range from 3.8/mi to ll.Qum were obtained by varying the solution concentration. It was found that the morphology of electrospun PVCz web was strongly correlated with viscosity. At lower solution concentration,webs containing beads and beads-ont으fibers were prepared, while, at higher one, fine and uniform fibers in webs could be formed. Average diameters of fibers in webs were decreased with increases in the applied voltage and TCD.
THF, TCE를 사용한 전기방사법에 의한 고분자량 폴리비닐카바졸 웹의 제조 및 특성(1)
김희삼(Hee Sam Kim),김미선(Mi Sun Kim) 산업기술교육훈련학회 2013 산업기술연구논문지 (JITR) Vol.18 No.4
Synthetic fibers of polymers have been produced for decades by conventional process, such as melt spinning, dry spinning or wet spinning. These techniques rely upon pressure-driven extrusion of a viscous polymer fluid and produce fibers that typically range from 10 to 500 ㎛ in diameter. Electrostatic fiber spinning, or ‘electrospinning,’ is a novel process for forming fibers with submicron-scale diameters through the action of electrostatic forces. Concentration of poly(N-vinyl carbazole) (PVCz) solution was varied from 3 to 18 wt%. All electrospinning procedures were carried out at room temperature. Applied voltage was ranged from 15 to 30 kV. Tip-to-collector distance (TCD) was varied from 10 to 40 cm. In the cases of, using THF and TCE as a solvent, at relatively lower concentration, bead and bead-onto-fiber were formed, comparing that with respect to fiber was found at relatively higher concentration. Increasing both the applied voltage and the TCD tended to produce smaller diameters of the electrospun fibers. The average diameter of PVCz fibers in web electrospun in TCE was much finer than that in THF. PVCz fibers in web prepared using high initial polymer concentration in THF were not cylindrical but planar similar with ribbon, owing to the difference in the viscosities and in evaporation in the rates of the solvent and the solutions.
자기기록매체 CoNiCr / Cr 이중박막의 자기적 성질과 미세구조와의 관계연구
김희삼(Hee-Sam Kim),남인탁(In-Tak Nam),홍양기(Yang-Ki Hong) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
Microstructural dependence of magnetic property of RF / DC sputtered Co_(69.0)Ni_(18.5)Cr_(12.5)/Cr double layer thin film was studied. Grain size was found to be decreased with substrate temperature in the range of 100-200 ℃ and Cr underlayer thickness(from 500 Å -2000 Å). The peaks (200) and (1120) of X-ray diffraction patterns were evidently grown with the substrate temperature for the Cr underlayer and magnetic layer, respectively, The CoNiCr magnetic layer was found to be well epitaxialy grown on Cr underlayer, and subsequently the coercivity was enhanced.
김태훈,조대현,김희삼,전병익 영남대학교 자원문제연구소 1995 資源問題硏究 Vol.14 No.-
To find the effects of structural parameters on the mechanical properties and weight loss of PET woven fabrics, the interrelations between construction, weft count, cover factor and T.M are investigated and discussed from Anova results. The mechanical property of textile material and clothing is a critical factor in the fabric performances. This study is aimed at finding the effects on the mechanical properties, pre-set and alkali-treated fabrics such as 0%, 12%, 18%,25%,30fs with different construction, weft count, twist, and density. The results obtained are following 1. The values of WT, RT, WC, MIU were increased, but the values · of B, 2HB, G, 2HG,RC, MMD, SMD were decreased by increasing the rate of weight loss. 2. Higher WT, 2HB, 2HG and lower RT were obtained when the weft denier was larger. 3. High RT and G values of plain and also B and 2HB values of satin were found in woven construction. 4. The higher cover factor, the larger WT,RT,2HG were resulted. 5. The values of WT, WC, MIU, MMD were higher but the values of RC, SMD were lower when T.M were increased.