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자외선을 조사한 C57BL Mice에서 자외선 조사부 및 차단부 표피내 멜라닌 세포의 변화에 관한 연구
김유찬,윤재일 ( You Chan Kim,Jai Il Youn ) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.3
In this experiment 40 adult male C57BL mice were used. The one ear of each animal was irradiated with high pressure mercury lamp (Burdick'UV-800) and the other ear was covered with nontransparent tape. Using split epidermal sheets treated with DOPA solution, a quatitiative study of epidermal melanocyte was carried out from the exposed and the shielded ear continuously on every second day during 14 daily exposures to 100 mJ/cm of UVB. The results were as follows : 1. Repeated radiation with ultraviolet light elicited a significant increase in population of melanocytes and the possible mechanism is a direct replication of the functioning melanocytes. 2. UVB irradiation induced increase in the number of epidermal melanocytes in covered ear as well as in irradiated ear. It is suggested that the population increase in the shielded skin is initiated by one or more systemic factors originating from the UVB irradiated skin.
김유찬,전수일 ( You Chan Kim,Soo Il Chun ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.1
The cutaneous mucinose are a group of connective disorders characterized by the deposition of mucin in the dermis. Thc disease may be a primary(metabolic) or secondary(catabolic). Secondary mucinosis is common in lupus erythematosus and dermatomyositis but rare in morphea. We report a case of guttate morphea with secondary cutaneous mucinosis. (Kor J Dermatol 1997;35(1): 165-168)
용탕단조 Al-Cu-Si-Mg 합금의 열처리시 제2응고상의 분해거동
김유찬,김도향,한요섭,이호인 ( Yu Chan Kim,Do Hyang Kim,Yo Sub Han,Ho In Lee ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.6
N/A The dissolution behavior of secondary solidification phases in squeeze cast Al-3.9wt%Cu-1.5wt%Si-1.0wt%Mg has been studied using a combination of optical microscope, image analyzer, scanning electron microscope(SEM), energy dispersive spectrometer(EDS), X-ray diffractometer(XRD) and differential thermal analyzer (DTA). Special emphasis was placed on the investigation of the effects of the nonequilibrium heat treatment on the dissolution of the second solidification phases. Ascast microstructure consisted of primary solidification product of α-Al and secondary solidification products of Al₂Cu, Mg₂Si and Al₂CuMg. Equilibrium and non-equilibrium solution treatments were carried out at the temperatures of 495˚C, 502˚C and 515˚C for 3 to 5 hours. The amount of the dissolved secondary phases increased with increasing solution treatment temperature, for example, area fractions of Al₂Cu, Mg₂Si and Al₂CuMg were approximately 0%, 1.6% and 4.2% after solution treatment at 495˚C for 5 hours, and were approximately 0%, 0.36% and 2% after solution treatment at 515˚C for 5hours. The best combination of tensile properties was obtained when the as-cast alloy was solution treated at 515˚C for 3hours followed by aging at 180˚C for 10 hours. Detailed DTA and TEM study showed that the strengthening behavior during aging was due to enhanced precipitation of the platelet type fine θ` phase. (Received August 23, 1997)
김유찬,김홍식,박향준,신용우,윤형근,정성훈 ( You Chan Kim,Hong Sik Kim,Hyang Joon Park,Yong Woo Cinn,Hyong Guen Yun,Sung Hoon Jung ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.5
Keloids are benign fibrcus growths which extend beyond the original wound and rarely regress. Available methods of treatment include surgical excision, radiotherapy, intralesional steroid injection, cryotherapy, systemie. chemotherapy, zinc tape strapping, pressure, silicon gel and combined therapy. Postoperative irradiation is a useful and effective method of eradication or prevent.ion of keloid. We describe two cases of the prevention of keloids associated with post,operative irradiation. (Korean J Dermatol 1997;35(5): 1009-1012)
모발로 분화하는 종양에 대한 임상 및 병리조직학적 소견 -대한피부과학회 피부병리 연구분과위원회 공동연구-
김유찬 ( You-Chan Kim ),강원형 ( Won-Hyoung Kang ),고재경 ( Jai-Kyoung Koh ),김낙인 ( Nack-In Kim ),김방순 ( Bang-Soon Kim ),김상원 ( Sang-Won Kim ),김수남 ( Soo-Nam Kim ),김수찬 ( Soo-Chan Kim ),노영석 ( Young-Suck Ro ),명기범 ( 대한피부과학회 2003 대한피부과학회지 Vol.41 No.9
Background : Data on the clinicopathologic features of hair follicle tumors in Korea are limited. Objective : The purpose was to investigate the clinical and histopathologic characteristics of hair follicle tumors in Korea. Methods : Two hundred sixty four cases of hair follicle tumors seen from 1999 to 2001 in Korea were analyzed clinically and histopathologically. Results and Conclusion : 1. The most common hair follicle tumor in Korea was pilomatricoma(81.0%), followed by trichoepithelioma(6.4%), dilated pore of Winer(3.8%), and proliferating trichilemmal tumor(2.2%). 2. Hair follicle tumors usually occurred as a solitary skin-colored nodule. The most commonly involved site was the face, and the peak age of presentation was 10 to 19. 3. Pilomatricoma usually occurred as a solitary skin-colored nodule. The most commonly involved site was the arm, and more than 50% of tumors occurred before the age of 20. Histopathologically, the tumor was often surrounded by fibrous capsule and was composed of basophilic and shadow cells. It was usually located in the dermis and extended into the subcutis. Retraction spaces between tumor nests and stroma were frequently observed. 4. Trichoepithelioma usually occurred as multiple skin-colored papules on the face. Histopathologically, the tumor was usually located in the dermis with sometimes connected to the epidermis. It frequently showed peripheral palisading. 5. Dilated pore of Winer usually occurred as a solitary brownish to pigmented papule on the face in middle-aged persons. 6. Proliferating trichilemmal tumor occurred as a solitary or multiple tumors. Histopathologically, the tumor was usually surrounded by incomplete fibrous capsule. Tumor cells frequently showed clear cell formation, nuclear atypia, mitosis, peripheral palisading, trichilemmal keratinization, and individual keratinization. (Korean J Dermatol 2003;41(9) : 1177~1186)
김유찬(You Chan Kim),김우영(Woo Young Kim),김현진(Hyun Jin Kim) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.2
To study the applicability of a scroll type compressor to small capacity refrigerators, a R600a scroll compressor with algebraic scroll wrap has been designed. Its size and performance have been compared to a reciprocating type of the same displacement volume. By employing scroll wrap based on algebraic curve, high compression ratio can be accomplished without increasing the wrap angle much so that compact scroll may be obtained. Compared to a reciprocating one, the designed scroll compressor has diameter and height reduced by about 50% and 80%, respectively. By numerical simulation, it has been estimated that the scroll compressor provides 38.6% more cooling capacity than reciprocating type with 8.9% more power consumption, resulting in 27.3% increase in COP for ASHRAE low back pressure condition. With increasing the operating pressure ratio from 9.5 to 15.3, the overall compressor efficiency of the scroll compressor decreases from 72.6% to 65.2%, while that of the reciprocating compressor increases from 55.7% to 59.8%.
김현재(Hyun Jae Kim),김성준(Sung Jun Kim),김유찬(You Chan Kim),김현진(Hyun Jin Kim) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
A steam expander has been studied for its usability as a power conversion device in a Rankine cycle, which can be used for on site power generation or waste heat recovery. Design of swash plate type expander has been practiced and its performance has been estimated. With the steam pressure and temperature of 35bar and 300℃ at the expander inlet, respectively, it was calculated that the expander produced the shaft power output of about 5㎾ from steam energy of 35㎾. Adiabatic and mechanical efficiencies of the designed expander were 86.5% and 96.7%, respectively. With the volumetric efficiency of 90%, the total efficiency of the expander was 75.3%.
에크린성 종양에 대한 임상 및 병리조직학적 소견 -대한피부과학회 피부병리 연구분과위원회 공동연구-
신정현 ( Jeong Hyun Shin ),고재경 ( Jai Kyoung Koh ),김광호 ( Kwang ho Kim ),김명화 ( Myung Hwa Kim ),김상원 ( Sang Won Kim ),김수남 ( Soo Nam Kim ),김시용 ( Si Young Kim ),김유찬 ( You Chan Kim ),손숙자 ( Sook Ja Son ),오지원 ( C 대한피부과학회 2006 대한피부과학회지 Vol.44 No.11
Background: Various eccrine tumors are rather common diseases in clinicians. However, data on the clinicopathologic features of eccrine tumors in Korea are limited. Objective: The purpose of this study was to investigate the clinicopathologic characteristics of eccrine tumors in Korea. Methods: Two hundred and sixty five cases of eccrine tumors, seen from 2002 to 2004 in Korea, were retrospectively analyzed clinically and histopathologically. Results: The most common eccrine tumors identified within Koreans were syringoma (61%), followed by eccrine poroma (13%), eccrine hidrocystoma (9%), and nodular hidradenoma (6%). Moreover, eccrine tumors were usually found to occur in middle-aged woman as multiple asymptomatic skin-colored papules. The most common site of occurrence was the face (45%), followed by the neck (9%), scalp (5%), foot (5%), abdomen (4%), and vulvar (3%). Conclusion: The results of this study will be useful and fundamental data on eccrine tumors for clinicians and pathologists. (Korean J Dermatol 2006;44(11):1273~1283)
한국인에서의 악성 흑생종에 대한 임상 및 병리 조직학적 연구 - 대한피부과학회 피부병리연구분과위원회 공동연구 -
이미우 ( Mi-Woo Lee ),고재경 ( Jai-Kyoung Koh ),권경술 ( Kyung-Sool Kwon ),김낙인 ( Nack-In Kim ),김상원 ( Sang-Won Kim ),김수남 ( Soo-Nam Kim ),김방순 ( Bang-Soon Kim ),김유찬 ( You-Chan Kim ),김종민 ( Jong-Min Kim ),명기범 ( Ki- 대한피부과학회 2003 대한피부과학회지 Vol.41 No.1
Backgorund ; Malignant melanoma in Korean has been increasing as in other countries, but there is no nationwide survey of malignant melanoma in Korea. Objective : The aim of this study was to document the clinical and histopathological features of cutaneo