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이상찬 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
To predict the shrinkage of molded parts using numerical simulations, the mathematical model should be simplified to overcome the difficulties of formulation due to non-linearity of problems. So it is hard to predict the shrinkage exactly because of the simplification. In the present work, the neural network is used to predict the shrinkage which can implement nonlinear models very well. Comparison between the results of neural network and that of the commercial analysis software, ABAQUS, shows that the result of the neural network is in better agreement with that of the experiments.
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이상찬,최진호 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.2
In today's highly competitive marketplace, it is of great significance for the manufacturing industry to reduce lead-time and costs fur the product development. Since first emerged in 1986, Rapid Prototyping (RP) technology has helped successfully to reduce time and costs. Recently, RP using functional materials such as metal has been researched. However RP using the molten metal has been struggling to resolve several drawbacks, such as dimensional inaccuracy, poor surface finish, post finishing, etc., that originate primarily from the overall deposition of molten metal for each layer. So, the purpose of this study is to develop a new RP technique using sheet metal and projection welding for reducing several drawbacks in occurring RP using molten metal. Also tensile and bending specimens were made by the developed RP process using projection welding and were verified.
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프로젝션 용접을 이용한 쾌속조형법에서 공정변수의 실험적 해석
이상찬,박정남,Lee Sang-Chan,Park Jeong-Nam 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.2
Rapid Prototyping (RP) technology has helped successfully to reduce time and costs since first emerged in 1986. Recently, RP using functional materials like as metal have been researched. However RP using molten metal and brazing material have been struggling to resolve several drawbacks, such as dimensional inaccuracy, poor surface finish and post finishing because occurring shrinkage and warpage at cooling. So, the purpose of this study is to develop a new RP technique using sheet metal and projection welding for reducing several drawbacks in occurring RP using molten metal. And optimum process variables were determined using desist of experiment(DOE).
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이상찬 서울대학교 규장각한국학연구원 2011 규장각 Vol.39 No.-
이 글은 1592년까지 전주 사고에 소장되었던 실록 805권 576책에 대해 1592년 이후에 가해진 변화의 양상을 정리하려고 한다. 실록의 보존 처리, 수리 복원, 재현 복제, 보관 관리 등의 실무 분야에 도움을 주기 위해서이다. 태조~명종 실록은 원래 806권 577책으로 쪽 염색 비단 표지에 내지를 밀랍처리하였고 모두 4질이 있었다. 1600년 이전에 이미 1권이 없어져서 805권 576책이 되었다. 1592년에 3질이 불타고 전주사고본 1질만 남았고 안전한 곳을 찾아서 몇 번이나 옮겨 다녔다. 몇 번을 옮겨다니긴 했어도 물에 젖거나 진흙에 오염되지 않았고 겉모습도 1636까지는 간행 당시의 원형을 그대로 가지고 있었다. 1636년 청군의 방화로 인해 211권이 책 전체가 없어졌고, 책장이 떨어지고 찢어지거나 표지가 떨어져 나간 것이 435권이었다. 전체 805권 중 159권만이 원형 그대로였다. 또한 건물 밖에서 비에 젖어 부패되거나 진흙에 오염되었다. 이러한 피해는 1664~6년에 수리 보수되었다. 그 결과 전주사고본 실록은 원형을 그대로 유지하고 있는 형태, 원래 표지에 떨어져 나간 책장을 베껴넣은 형태, 표지만 바꾼 형태, 표지를 바꾸고 낙장을 베껴 넣은 형태, 떨어져 나간 책장을 그대로 두고 권차에서 제외한 경우, 남아있는 낱장을 한 데 묶은 형태 등 여러 가지 모습을 갖게 되었다. 빗물로 인한 부패와 훼손은 1640년대 이후 지금까지도 제대로 처리되지 못하고 있다. 부패와 훼손의 시기와 원인을 알게 되었으므로 밀랍본 실록의 보존처리 연구에도 진전이 있을 것으로 기대된다. 전주사고본 실록은 1606~60년 강화의 마니산 사고에 보관되었다고 알려져 있다. 그러나 마니산 사고의 설치가 자료를 통해 확인되지 않고 마니산 사고터로 알려진 장소가 사고를 두기에 적당하지 않다. 마니산보다는 강화부 안에다 건물을 마련하여 사고로 사용했던 것으로 보인다.
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이상찬,한경수 원광대학교 치의학연구소 1997 圓光齒醫學 Vol.7 No.1
This study was performed to investigate the changes of head posture according to natural standing or sitting posture. Twenty seven healthy dental students without any signs and symptoms of temporomandibular disorders participated in this study. Cervical resting posture (CRP) of the head in sagittal plane was measured by Cervical-Range-of-Motion^ (CROM, U.S.A.) and lateral cephalograph was taken in natural posture. The items related to angle in cephalograph were the angles of cranial and cervical inclination to true vertical line(VER/NSL, VER/AML), the angles of cervical inclination to nasion-sella line(CVT/NSL, OPT/NSL), the angles of cervical inclination to horizontal line(CVT/HOR, OPT/HOR), the angle of cervical lordosis(CVT/OPT). The items related to line measurement were the distance from subocciput to C1(D1), Cl to C2(D2), C2 to C3(D3), C3 to C4(D4), the upper(PNS to posterior pharyngeal wall) and the lower(tongue base to posterior pharyngeal wall) pharyngeal space, the distance from nasion to menton(Na-Me), and the radius of cervical curvature from the first cervical vertebra(Cl) to the fifth cervical vertebra(C5). The data were analyzed with SAS/STAT program. The obtained results were as follows 1. Most items related to angular measurement showed significant difference between in standing and sitting posture. The angles of CRP, CVT/NSL, OPT/NSL, CVT/HOR, OPT/HOR, and CVT/OPT were high in sitting posture, but the angles of VER/NSL, VER/AML were low in sitting posture. 2. In vertebral distance, only the distance between C3 and C4 was differed by the posture, which decreased in sitting posture. In sitting posture, the distance from nasion to menton(Na-Me) was longer, but the radius was shorter than in standing posture. 3. Correlationship in angular measurement was almost same in both postures. Cervical resting posture(CRP) was correlated with VER/NSL, VER/NSL was correlated with CRP, CVT/NSL, and OPT/NSL, VER/AML was correlated with CVT/HOR, OPT/HOR, CVT/OPT, and the angle of cervical lordosis(CVT/OPT) was correlated with the radius. 4. Correlationship in linear measurement was observed only in among D3, D4, and radius. And Na-Me was not correlated with any other items. From this results, the author concluded that head posture in sitting was more backward extended than in standing.
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이상찬,남기곤,김재창,강창순,정두영,이상욱 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.2
One of the central problems in sereo matching is the selectionof the optimal window sizes for comparing image regions. The window size must be large enough to include enough variation for reliable matching, but small enough to avoid the effect of projection distortion. This paper discusses these problems with some novel algorithm based on iterativediffusion process at different disparity hypotheses. Also this paper proposes four kinds of diffusion algorithms to preseve discontinuity in stereo matching. We present and discuss extensive empirical results of algorithms based on various sets of synthetic and real image.
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