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적층 가공된 3차원 조형체의 치밀화에 미치는 단일 melt pool 형상의 영향
최중호,윤재철,양동열,양상선,유지훈,이창우,김용진,Choe, Jungho,Yun, Jaecheol,Yang, Dong-Yeol,Yang, Sangsun,Yu, Ji-Hun,Lee, Chang-Woo,Kim, Yong-Jin 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.3
Selective laser melting (SLM) can produce a layer of a metal powder and then fabricate a three-dimensional structure by a layer-by-layer method. Each layer consists of several lines of molten metal. Laser parameters and thermal properties of the materials affect the geometric characteristics of the melt pool such as its height, depth, and width. The geometrical characteristics of the melt pool are determined herein by optical microscopy and three-dimensional bulk structures are fabricated to investigate the relationship between them. Powders of the commercially available Fe-based tool steel AISI H13 and Ni-based superalloy Inconel 738LC are used to investigate the effect of material properties. Only the scan speed is controlled to change the laser parameters. The laser power and hatch space are maintained throughout the study. Laser of a higher energy density is seen to melt a wider and deeper range of powder and substrate; however, it does not correspond with the most highly densified three-dimensional structure. H13 shows the highest density at a laser scan speed of 200 mm/s whereas Inconel 738LC shows the highest density at 600 mm/s.
최중호,이종욱,장영철,오석준,최영웅,Choi, Joong Ho,Lee, Jong Wook,Jang, Young Chul,Oh, Suk Joon,Choi, Young Woong 대한성형외과학회 2005 Archives of Plastic Surgery Vol.32 No.1
Recently, the usage of an exercising treadmill has increased in Korean homes. Along with increasing utilization of these machines, injuries relating to the inadvertent usage of the machine have gradually increased for the last several years. The purpose of this study is to identify the feature of this type of injury, thereby to help prevent and to raise an awareness of the potential injury. 25 patients who had been admitted to Hangang Sacred Heart Hospital from January 2002 through March 2004 were investigated retrospectively. Age, sex, place of injury, the area and the extent of injury, treatment and prognosis were analyzed for each case. All injuries involved in the children with an average age of 3.5 years. This new type of injury was at least a deep second-degree burn of the friction-burn type in all cases. Most of them primarily involved hands. Inattention of the guardian was the main cause of such injuries. 68% of the cases needed an operation such as a split-thickness skin graft or a full-thickness skin graft. In this study, authors reached a conclusion that such injuries may be prevented by an education of the potential risks of using a treadmill and by developing additional safety devices.
實驗的 渗出性 中耳炎에 있어서 中耳粘膜의 部位別 病理組織學的 變化에 關한 硏究
崔重鎬,申洪秀 고려대학교 의과대학 1986 고려대 의대 잡지 Vol.23 No.3
Otitis media with effusion is a disease associated with the various forms of effusion in the middle ear cavity and hearing impairment. Negative pressure state in the middle ear cavity due to dysfunction of Eustachian tube results in the formation of effusion from plasma, interstitial fluid or the secretory cells in the mucosa due to various histopathological changes of mucosa. It is thought that the mucosal changes well explain the pathogenesis and pathology of otitis media with effusion and the observation of the mucosal changes at the various locations of the middle ear cavity would be helpful to understand the pathogenesis of otitis media with effusion. The author had induced otitis media with effusion experimentally in rabbits by the tubal occlusion, and had observed the histopathological changes at the six location of middle ear mucosa, such as inferolateral and inferomedial surface of hypotympanic bulla, transitional zone of hypotympanic bulla, promontory, tympanic membrane, epitympanum, during the course of time after experiment and reached the following results. 1. In histopathological changes, epithelial hyperplasia of the middle ear mucosa, capillary proliferation and inflammatory degree were most marked at the transitional zone of the hypotympanum and the least marked at the mucosa of the tympanic membrane. 2. Fibrosis of the submucosal connective tissue layer was most marked in the transitional zone and promontory. 3. The mucosal changes at each location were most prominent at the 14th day, then 28th day of tubal occlusion and decreased gradually. 4. The character, cellular component and bacteria in effusion of the middle ear cavity somewhat reflect the degree of mucosal damage generally, but there seems to be no specific relationship with different site of mucosa.
고려 한자음의 특징 연구 - 고려대장경 각성인 이표자의 운모 대응을 중심으로 -
최중호 동남어문학회 2009 동남어문논집 Vol.1 No.28
This paper is to study feature of chinese character which appears in a person's mark of Kakseongins((刻成人) of Koryodaejangkyoung(高麗大藏經). it is judged that Kakseongins mark is a valuable material which shows appearance of chinese character of Geryeo age. The results are the same as following. The first, the letters which are appliable to most rime are greatly different from opposition of sino-Korean. The second, occasionally, opposition of ending can uncenterly apper. The third, it is opposition of ‘夫' and '甫' in <kwangwoon>(廣韻). It becomes same rims, and in chinese character of Geryeo age. It is used with mark of the sameness person's name. This paper is to study feature of chinese character which appears in a person's mark of Kakseongins((刻成人) of Koryodaejangkyoung(高麗大藏經). it is judged that Kakseongins mark is a valuable material which shows appearance of chinese character of Geryeo age. The results are the same as following. The first, the letters which are appliable to most rime are greatly different from opposition of sino-Korean. The second, occasionally, opposition of ending can uncenterly apper. The third, it is opposition of ‘夫' and '甫' in <kwangwoon>(廣韻). It becomes same rims, and in chinese character of Geryeo age. It is used with mark of the sameness person's name.