1896년 의병과 명성왕후 지지세력의 동향

이상찬 서울대학교 규장각한국학연구원 1997 한국문화 Vol.20 No.-

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사출성형의 충전시 고분자용융액의 압축성이 유동장과 단섬유 배향에 미치는 영향

이상찬,고진,윤재륜,Lee, S.C.,Ko, J,Youn, J.R. 한국유변학회 1998 Korea-Australia rheology journal Vol.10 No.4

단섬유 강화 고분자의 사출성형시 고분자 수지의 유동에 의하여 섬유배향이 필연적으로 일어나며, 섬유배향에 의한 이방성 (anisotropy)은 최종성형물의 품질과 기계적인 특성 등에 많은 영향을 미친다. 사출공정 중에서 충전과정(filling stage)은 섬유배향에 지배적인 역할을 하므로, 충전과정의 유동장을 정확하게 해석하는 것은 매우 중요하다. 형상이 복잡한 캐비티(cavity)와 다중 캐비티에서는 먼저 충전이 완료되어 현탁액(suspension)이 압축을 받고 있는 영역들이 존재하게 된다. 기존의 방법처럼 사출성형의 충전과정을 비압축성 유동으로 가정하면 정확한 유동장을 계산할 수 없다. 본 연구에서는 충전과정에서 압축성을 고려한 혼합 유한요소법/유한차분법을 이용하여 유동장을 계산하였다. 충전이 완료되는 순간에서, 이차배향텐서에 대한 배향변화방정식을 4차 Runge-Kutta 방법을 이용하여 해석함으로써 3차원 섬유배향장을 예측하였다. 충전시간이 다른 4개의 캐비티를 갖는 금형을 제작하여 충전과정에서 압축성 효과를 고려한 수치해석 결과가 실험과 잘 일치함을 보였다. 또한, 압축성과 비압축성 유동장에서 이론적으로 계산된 섬유배향의 차이를 정성적 및 정량적으로 비교하였다. The anisotropy caused by the fiber orientation, which is inevitably generated by the flow during injection molding of short fiber reinforced polymers, greatly influences dimensional accuracy, mechanical properties, and other quality of the final product. Since the filling stage of the injection molding process plays a vital role in determining fiber orientation, an accurate analysis of flow field for the filling stage is needed. Unbalanced filling occurs when a complex or a multi-cavity mold is used leading to development of regions where the fiber suspension is under compression. It is impossible to make an accurate calculation of the flow field during filling with the analysis assuming incompressible fluid. A mold with four cavities with different filling times was produced to compare the numerical analysis results with the experimental data. There was a good agreement between the experimental and theoretical results when the compressibility of the polymer melt was considered for the numerical simulation. The fiber orientation states for compressible and incompressible fluids were also compared qualitatively as well as quantitatively in this study.

가보필터를 이용한 영역기반 영상 분할

이상찬 동의공업대학 2001 論文集 Vol.27 No.1

In this paper, an algorithm on the segmentation of multi-textured image using of Garbor filter is proposed. There are several methods for the image segmentation, and the Garbor filter is the famous method for segmenting multi-textured images. Garbor filter has been shown to posess optimal filter properties and to have similarities to biological vision systems. Despite considerable research activity, the design of single or multiple Garbor filter to segment multiple textures remains an open issue. In the method, it yields the good performance, but it is very difficult in making an optimal filter. Therefore, it is used histogram to simplify filtering process. Finally, histogram method makes us have a short-term algorithm and a good performance.

국사교과서에서 배우는 호남차별

이상찬 사회평론 1992 길을찾는사람들 Vol.92 No.8

서 있는 자세와 앉은 자세에서 두부자세의 변화

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.

확산망을 이용한 스테레오 정합에 관한 연구

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.

비용종의 초미형태학적 변화

이상찬,손진호,서인수 慶北大學校 醫科大學 1995 慶北醫大誌 Vol.36 No.1

목적 : 비용종은 빨리 자라며 알러지와 관계있다고 알려져 있다. 비용종의 조직학적 소견은 간질의 부종과 혈관의 증식이 특징이다. 본 연구는 비용종을 전자현미경으로 검색하여 그 발생기전의 일단을 규명하고자 하였다. 대상 및 방법 : 증례의 환자로 부터 제거된 12례의 비용종을 광학 및 전자현미경적으로 검색하였다. 결과 : 비용종의 조직은 감각·혈관운동성 및 분비 운동성 신경분포가 거의 발견되지 않았다. 호중구 및 호산구가 상피를 포함하는 전 조직층에서 흔히 관찰되었다. 형질세포가 단독 혹은 군집으로 발견되었는데 전자현미경으로 ER의 cysternae가 확장되어 있었다. 비만세포의 과립은 부분적으로 고갈되어 있었다. 비용종의 혈관은 염증이 심하지 않는 경우는 적었고, 내면에는 호중구·혈소판·적혈구·섬유성 물질세포파괴물이 뭉쳐서 혈관을 막고 있는 것을 관찰하였다. 결론 : 따라서 신경세포소실이 알러지반응, 감염 및 염증과 결합하여 해부학적 취약장소인 중비도나 무비 등의 자연개구부 특히 사골동 개구부에 부종을 형성하고, 비용종을 유발시킬 수 있다고 생각된다. Twelve nasal polyps from seven individuals were, light microscopically and electorn microscopically, investigated for a morphologic evaluation of these devoid of sensory, vasomotor and secretomotor innervation. Neutrophilic and %osinophilic leukocytes were found in increased in numbers in all tissue layers including the epithelium. Plasma cells, single and in clusters exhibited activity in the cysternae of the endoplasmic reticulum with distention. Mast cells were characterized by partly depleted granules. Some blood vessels were occluded by clusters of neutrophilic leukocytes, blood platelets, some fibrous material and cell debris. It is suggested that loss of innervation combined with allergic reactions, infection, or inflammation are responsible for the development of nasal polyp, mainly at the anatomical weak points such as middle meatus and opening sites of paranasal sinuses, esp. esthmoid sinus.

대한유도대학 우수선수의 시합 중 Energy 대사량과 호흡, 순환기능에 관한 연구

이상찬 용인대학교 1985 용인대학교 논문집 Vol.1 No.-

특집1 : 지방자치제, 그 오욕의 역사와 한국민중 한말 지방자치 실시 논의와 그 성격

이상찬 역사문제연구소 1991 역사비평 Vol.- No.15

1900년대 초 한일간 조약들의 불성립 再論

이상찬 한일역사공동연구위원회 2005 한일역사 공동연구보고서 Vol.4 No.-