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이상찬,윤한용 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-
To simulate the real molding conditions, the effects of phase change and compressibility of the resin were considered in the present investigation. A modified Cross model with either an Arrhenius-type or WLF-type functional form was used for modeling viscosity of the resin. A double-domain Tait equation of state was employed to describe the compressibility of the resin during molding. The energy balance equation including latent-heat dissipation for semi-crystalline materials was solved in order to predict the solidified layer and temperature profile. Injection molding experiments were carried out using polypropylene(PP) in the present study. Based on the comparison between experiments and simulations, it was found out the predicted pressure distributions and melt front propagations were accurate. Thus it was concluded that the program developed in this study was proved to be useful in simulations of injection molding process.
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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.
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이상찬 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
In today's highly competitive marketplace, it is of great significance for the manufacturing industry to reduce lead-time and costs for 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 like as metal have been researched. However RP using molten metal have 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. And optimum process variables were determined using design of experiment(DOE).
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이상찬,윤한용 木浦大學校 應用科學硏究院 2001 應用科學硏究誌 Vol.1 No.-
To simulate the real molding conditions, the effects of phase change and compressibility of the resin were considered in the present investigation. A modified Cross model with either an Arrhenius-type or WLF-type functional form was used for modeling viscosity of the resin. A double-domain Tait equation of state was employed to describe the compressibility of the resin during molding. The energy balance equation including latent-heat dissipation for semi-crystalline materials was solved in order to predict the solidified layer and temperature profile. Injection molding experiments were carried out using polypropylene(PP) in the present study. Based on the comparison between experiments and simulations, it was found out the predicted pressure distributions and melt front propagations were accurate. Thus it was concluded that the program developed in this study was proved to be useful in simulations of injection molding process.
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이상찬 동의공업대학 1999 論文集 Vol.25 No.1
One of the central problems in stereo matching is the selection of optimal window sizes for comparing image regions. This paper discusses this problem with some novel algorithms based on iteratively diffusion process at different disparity hypotheses. And locally controlling the amount of diffusion based on the current quality of the disparity is estimated. We provide experimental results on the real stereo image pairs.
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이상찬 서울대학교 규장각한국학연구원 2013 한국문화 Vol.61 No.-
After the dissolution of the Chosŏn royal court in 1910, the Japanese colonial government of Korea began to consolidate and catalog Korean archival collections. The restructuring process started with the idea of consolidating all historical records at the Kyujanggak archive, while relocating some of the originally Kyujanggak‐held documents to the Changsŏgak archive, and later continued with the classification of the historical records thus amassed at the Kyujanggak archive. The concentration of materials at Kyujanggak and their classification can be regarded as an attempt by the Japanese colonial government to consolidate and arrange the historical sources for the Chosŏn dynasty. However, the cataloguing policy of the Japanese Government‐General implemented in Korea differed significantly from the treatment of the historical records of the Edo period under the Meiji government. By 1910, a consistent methodology of collecting and classifying Edo‐era documents had not yet been developed, so the Japanese Government‐General needed to create its own approach. Records regarding individual monarchs, archives of various government ministries and materials from provincial history archives were removed from their original locations and, regardless of their original classifications, were clustered together in what came to be the “Library of Chosŏn Government‐General.” In Japan, on the contrary, the collection of Edo historical records was classified according to the lineage [in which the documents were kept], and the materials were not removed from their original locations. Administrative record files of the Chosŏn government and financial registers of the Chosŏn imperial family were always handled according to special rules, but in the new classification scheme they were instead simply treated as old documents – new titles were assigned at will and the original ordering was destroyed. The four‐division system (i.e., Classics, Histories, Philosophy and Belles‐lettres) was applied to the materials pertaining to individual monarchs, administrative and financial records usually preserved in separate repositories, and old documents – all of which used to be exempt from the four‐division cataloguing system. As a result, the historical records accounted for seventy percent of the collection, while the rest of the catalogue became so complicated that it drastically reduced the usefulness of the four‐division classification. This new cataloguing scheme distorted the original structure of the Chosŏn‐era collections (e.g., Kyujanggak, regional repositories, records of various ministries). Old books, administrative records, records of individual monarchs, financial records of the imperial family and individual old documents were mixed together without a system that would reflect the specificity of each group of materials. The restructuring of the Korean archives and the survey of the written records conducted by the Japanese government in Korea thus had a clear purpose: to emphasize the collapse of the Chosŏn dynasty and to reorganize the archival holdings according to the colonizing logic of the empire.
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