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상이한 초미세립 구조를 갖는 OFHC Cu의 연성에 영향을 미치는 요소인자
박이주(L. J. Park),감형원(H. W. Kim),이종수(C. S. Lee),황시우(S. W. Hwang),박경태(K.-T.Park) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
Tensile ductility of OFHC Cu with the different ultrafine grained (UFO) structures, which were fabricated by the different routes of equal channel angular pressing (ECAP), was associated in detail with the microstructural characteristics developed by ECAP. OFHC Cu having the lamellar and equiaxed UFO structures was prepared by ECAP of routes A and Bc respectively up to 8 and 16 passes. Their microstructures were closely examined by transmission electron microscopy and orientation image mapping. Tensile tests at room temperature were conduced on the ECAPed samples under the quasi- static condition of 10?³ s?¹ and 1 s?¹. Uniform elongation of the lamellar UFO samples decreased with increasing the ECAP passage while both uniform and total elongations of the equiaxed UFO samples increased. In the case of route A producing the lamellar UFO structure, the fractions of high angle grain boundaries and grains less than 0.5 ㎛ increased significantly but an analysis revealed that the dislocation free length decreased with increasing the ECAP passage. For route Be resulting in the equiaxed UFO structure, the fraction of high angle grain boundaries increased but the grain size distribution and the dislocation free length remained nearly unchanged with increasing the ECAP passage. From the present experiments and analyses, it was found that tensile ductility of lamellar UFO OFHC Cu is primarily controlled by the dislocation free length and that of the equiaxed one is mainly dependent on the fraction of high angle grain boundaries.
대장의 샘종을 동반한 위와 대장의 다발성 증식성 폴립증 1예
이주하,이성은,박예리,박신애,김의형,심건호,전은정,오정환,최상욱,민기옥 대한소화기내시경학회 2007 Clinical Endoscopy Vol.35 No.3
Hyperplastic polyps occur either sporadically or as a symptom of polyposis syndrome. When individuals exceed 50 polyps, they are diagnosed with hyperplasic polyposis. Moreover, since such cases are even more sporadic than hyperplastic polyps, the course toward this occurrence has not been properly evaluated. A change to malignancy in hyperplastic polyps is rare; however, when multiple lesions are present, the tendency increases. Colorectal polyposis syndromes with gastric polyps include familial adenomatous polyposis, Gardners syndrome, Peutz-Jeghers syndrome, juvenile polyposis and others with a non-genetic origin. Three cases of multiple colorectal hyperplastic polyposis with gastric hyperplastic polyposis have been reported worldwide; however, a case associated with multiple colonic adenomas has not yet been reported. This study reviews the existing literature and reports our recent experience of a case, in which a 53 year-old man with colorectal and gastric hyperplastic polyposis with associated multiple colonic adenomas. (Korean J Gastrointest Endosc 2007;35:196-200) 증식성 폴립은 산발적으로 발생하거나 폴립증 증후군 형태로 발생한다. 증식성 폴립의 수가 50개 이상일 때 증식성 폴립증이라고 하나 매우 드물게 보고되고 있어 자연 경과에 대해서는 자세히 밝혀져 있지 않다. 증식성 폴립의 악성 변화는 드물지만 다발성 병변일 때 악성 변화의 가능성이 증가한다. 위장의 폴립을 동반한 대장의 폴립증 증후군은 가족성대장폴립증, Gardner 증후군, Peutz-Jeghers 증후군, 연소성 폴립증 등에서 발견되나 비유전적인 경우도 있다. 전 세계적으로 대장과 위장에서 다발성 증식성 폴립증이 동시에 발생한 예는 약 3예이나 대장의 샘종까지 동반된 예는 보고 된 적이 없다. 최근 저자들은 53세의 남자 환자에서 대장의 샘종을 동반한 위장과 대장의 다발성 증식성 폴립증을 경험하였기에 문헌 고찰과 함께 보고하는 바이다.