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철강재료의 다이아몬드절삭에 있어서 단속절삭가공법의 적용에 의한 공구마모억제
송영찬(Song Young Chan),根津健太郞(Nezu Kentaro),박천홍(Park Chun Hong),森脇俊道(Moriwaki Toshimichi) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.6
Ultraprecision cutting of steels with geometrically defined single crystal diamond tools is handicapped by excessive tool wear. This paper presents a new approach to suppress the wear of single crystal diamond tool in cutting of steels. In general, it is said that the wear of diamond tool is caused by chemically reactive wear under high temperature and high pressure conditions. In order to suppress such chemical reactions, the time of contact between the diamond tool and the steel work in cutting was controlled by employing the intermittent cutting method such as fly-cutting. Series of intermittent cutting experiments have been carried out to control the tool-work contact time by changing one cycle of cutting length and cutting speed. The experimental results were shown that the tool wear was much dependent on the contact time regardless of the cutting speed, and that the wear was much suppressed by reducing the tool-work contact time. It is expected that the steels can be successfully cut with a single crystal diamond tool by controlling the contact time.
Koebner 현상에 의해 선상태선의 임상 양상을 보인 광택태선
송영찬 ( Young Chan Song ),고종현 ( Jong Hyun Ko ),오병호 ( Byung Ho Oh ),이양원 ( Yang Won Lee ),최용범 ( Yong Beom Choe ),안규중 ( Kyu Joong Ahn ),송계용 ( Kye Yong Song ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.11
Lichen nitidus is an uncommon, asymptomatic cutaneous shiny papular eruption and it can rarely show Koebner`s phenomenon, which may clinically resemble lichen striatus. It is known that for such cases, the clinicopathological correlation is the most important factor for making the diagnosis and immunohistochemical staining for CD4, CD8 and CD68 can be helpful to differentiate these two diseases. We experienced a case of Koebner phenomenon, which clinically mimicked lichen striatus, in a patient suffering with lichen nitidus. (Korean J Dermatol 2008; 46(11): 1517∼1520)
송영찬 ( Young Chan Song ),오병호 ( Byung Ho Oh ),이양원 ( Yang Won Lee ),최용범 ( Yong Beom Choe ),안규중 ( Kyu Joong Ahn ),송계용 ( Kye Yong Song ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.1
Cutaneous leiomyoma is a rare benign tumor that originates from the smooth muscles derived from arrector pili muscles, the media of dermal blood vessels and the dartos muscle of the scrotum, vulva or nipples. Piloleiomyomas usually occur in the second to third decades of life with an equal incidence in men and women. They can be solitary, but multiple lesions are seen in 80% of these patients. Although multiple leiomyomas are often grouped, unilateral zosteriform pilar leiomyoma is rare. We report here on a rare case of grouped piloleiomyomas that presented as a zosteriform pattern on the right trunk of a 59-year-old woman. (Korean J Dermatol 2009;47(1):59~62)
섬유 혼입량 및 피복두께에 따른 고강도 콘크리트의 내화성능에 관한 실험적 연구
송영찬(Song Young-Chan),김용로(Kim Yong-Ro),오재근(Oh Jae-Keun),김욱종(Kim Ook-Jong),이도범(Lee Do-Bum),고창현(Ko Chang-Hyun) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
In this study, it was investigated fire resistance properties of high strength concrete depending on fiber contents and depth of concrete cover as a countermeasure for explosive spalling of concrete on fire. As a test result, it was appeared that the more fiber contents rises, the lower fire resistance performance is. It is also estimated that minimum depth of concete cover is required 50㎜.