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SGCI 材料의 Casting 및 磨滅强度에 關한 硏究
김성주,문형태,최익수,노무근 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.2
In order to collect the basic data for the production of nodular cast iron requiring wear resistance. the mechanical nature such as structure analysis, hardness, and tensile strength were performed on cast sample by changing residual Mg concentration of cast iron at the range of 0∼0.052% and also the wear characteristics were examined through wear test by changing abrasion speed and final load. As a result, the following conclusions were drawn. The wear amount rapidly accelerates to the maximum abrasion sped of 2.3m/sec in a sample without Fe-Si-Mg alloy processing(residual Mg amount; 0%) by increasing the abrasion speed from 1.3m/sec to 2.3m/sec. As the Mg residual Mg contents increases, the ratio of nodular increases while hardness of a sample accelerates and the wear amount decreases. The maximum point moved to the high speed side in a sample with 0.043% residual Mg contents and the wear amount showed the maximum in 3.5m/sec of abrasion speed while a sample with 0.052% residual Mg contents showed the mechanical destruction wear to 4.3m/sec abrasion speed. The more residual Mg contents are in 0.6-l.1m/sec low speed range of abrasion speed, the more wear amount was resulted while the less residual Mg contents were. the less wear amount showed. Oxidation wear occurs at 4.5m/sec of traveling velocity. Since the wear of matrix structure occurs after wear of oxidized substance in friction caused by oxidized substance, the wear amount shows less than 2.3mg/sec traveling velocity. Therefore, as the residual Mg contents increase, the wear amount decreases. Although the wear amount is large since the traveling distance of destruction wear lasts very long. the residual Mg contents are small and the oxidation wear area becomes long in a sample with low hardness. Since the mechanical destruction wear occurs when the traveling &stances reaches to the end, the wear amount results in very small. The scratches appeared due to abrasive wear in mechanical destruction wear with 2.3/sec abrasion speed while it did not show in oxidation wear although the severe wear occurred. The sectional melting appeared in 5.4m/sec of high speed friction since the temperature of contact point increased more than 1000℃. Scratches are less in the area with low load and if load increase, shoving occurs in wear grooves. In the maximum load, the severe cracking phenomenon can be observed.
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타액선 다형성 선종에서 Glycosaminoglycan의 발현
김성주,김철환,김경욱,Kim, Seong-Joo,Kim, Chul-Hwan,Kim, Kyung-Wook 대한악안면성형재건외과학회 2006 Maxillofacial Plastic Reconstructive Surgery Vol.28 No.2
Pleomorphic adenoma is the most common benign tumor in salivary glands, and occurred in frequency of 60% in parotid gland tumors, and 50% in submandibular gland tumors, and 25% in sublingual gland tumors. Histopathologically, pleomorphic adenoma is composed of epithelial cells and mesenchymal tissues, and called 'mixed tumor' because of morphological divergency. The cell structures of luminal area are composed of polyhedral and cuboidal secretory epithelial cells and modified myoepithelial cells around it, and mesenchymal tissue is composed of some myoepithelial cells and stromal tissue. In stromal tissue, myxoid change, chondroid change, or hyalinization can be seen even if bone tissue. In many studies, tumor cells of pleomorphic adenoma containing modified myoepithelial cell participate in synthesis of glycosaminoglycans. In this study, tissue sample of pleomorphic adenoma of human salivary gland were obtained from 20 surgical specimens, and all specimens were routinely fixed in 10% formalin and embedded. Serial 4-8${\mu}m$ thick sections were cut from paraffin blocks. The histopathologic evaluation was done with light microscopy. And, with immunohistochemical staining, characteristics of glycosaminoglycan were observed. And, for biochemical analysis of glycosaminoglycan, isolation of crude glycosaminoglycan from tumor tissue and immuno-blot analysis were carried out. With transmission electromicroscopy, tumor cells and biologic behavior of pleomorphic adenoma were observed with distribution and expression of glycosaminoglycan in tumor cells, The results were obtained as follows: 1. In immunohistochemical study, chondroitin 4-sulfate is highly postively stained in myxoid stromal tissue, and chondroitin 6-sulfate is highly positively stained in chondroid mesenchymal tissue, both glycosaminoglycans are positively stained in non-luminal cell of ductal area. 2. Dermatan sulfate and keratan sulfate is positively stained in periductal non-luminal tumor cells. 3. In immunohistochemical study, heparan sulfate is weakly stained in luminal cells and non-luminal cells around duct, and chondroid mesenchymal tissue. 4. In transmission electromicroscopic view, the tumor cells are composed of modified myoepithelial cells, and contain many microfilaments and well developed rough endoplasmic reticulum. 5. In Immuno-Blot analysis, the expression of glycosaminoglycans is expressed mostly in chondroitin 6-sulfate and chondroitin 4-sulfate. From the results obtained in this study, tumor cells of pleomorphic adenoma are composed of modified myoepithelial cells, and glycosaminoglycans of chondroitin 4-sulfate and chondroitin 6-sulfate mostly participate in the development of pleomorphic adenoma, but dermatan sulfate, keratan sulfate and heparan sulfate glycosaminoglycans were expressed variably.
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김성주 동국대학교 국어교육과 1993 목멱어문 Vol.5 No.-
이 글은 서정목(1988, 1990, 1991), 서태룡(1992) 등의 청자대우 현상에 대한 최근의 논의에서, 청자대우 표지 ‘-으이(-)’와 ‘-읍-/-으오-’의 확인을 통한 형태론적 접근 방법만으로는 청자대우 현상을 설명하는데 충분치 않음을 보이고 특히, 대우현상이 문법적이라기보다는 화용론적인 것임을 보이는데 목적이 있다. 한국어의 청자대우 현상을 보다 잘 파악하기 위해서는 서정목(1988,1990), 서태룡(1992) 등의 형태론적 연구와 함RP 화용론적 연구를 병행해야만 한다. 서정목(1988)은 한국어의 청자대우 현상이 형태소를 기초로 하여 설명되어야 함을 주장하고, 청자대우 등급을 과거와 같이 등급의 정도 차이에 의해 파악할 것이 아니라, 청자대우 표지‘-이/잇-’의 실현 여부에 따른 유무 대립의 체계로 파악해야 한다고 주장했다. 그는 청자를 손윗 사람과 손아랫 사람으로 나누고, 손윗 사람을 높게 대우해 줄 때와 그렇게 않을 때, 또 손아랫 사람을 높게 대우해 줄 때와 그렇지 않을 때로 나누어, 손위 사람이든 손아랫 사람이든 높게 대우해 줄 때는 ‘-이/잇-’이 실현되고 그렇지 않을 때는 ‘-이/잇-’이 실현되지 않는다고 보았다. 그러나 실제로 청자대우 체계가 서정목(1988)의 주장대로 간단하지는 않다. 서정목(1988)의 논의대로라면 ‘해라’체는 손윗 사람이 손아랫 사람을 낮출 때 사용하고. ‘하게’ 체는 손윗 사람이 손아랫 사람을 대우해 줄 때 사용하며, ‘하오’ 체는 손아랫 사람이 손위 사람을 낮출 때 사용하고, ‘합쇼’ 체는 손아랫 사람이 손윗 사람을 높일 때만 사용한다고 볼 수 있다.
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