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이종 알루미늄 합금 A6K31/A5J32 겹치기 마찰교반 접합부의 인장성질에 미치는 접합조건의 영향
윤태진,김상주,송상우,홍재근,강정윤,Yoon, Tae-Jin,Kim, Sang-Ju,Song, Sang-Woo,Hong, Jae-Keun,Kang, Chung-Yun 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.2
The scope of this investigation is to evaluate the effect of joining parameters on the microstructural features and mechanical properties of dissimilar aluminum alloys, 1mm-thickness fixing AA6K31 at the top position and fixing AA5J32 at the bottom position. The friction stir lap welds were studied under various welding conditions, rotation speed of 1000, 1250, 1500rpm and welding speed of 100, 300, 500, 700mm/min, respectively. Mechanical test has been investigated in terms of tensile shear test and hardness test. The results showed that three type nugget shapes such as onion ring, zigzag type, hooking with the void, have been observed with revolutionary pitch. All welding conditions fractured at the HAZ of top plate, A6K31 and also the strength compare with base metal of lap joints were low efficiency, 52~63%. The thickness of fractured position was decreased with the lower heat input conditions. The relationships were excellent due to linear between the effective thickness of fractured position and peak load. The fractured position was the interface between joint area and not joint area. Also the strength efficiency compared with base metal was lower than decreasing rate of thickness because the hardness was decreased at fractured position due to softened material.
증식당뇨망막병증에서 유리체절제술 후 양호한 시력 결과를 보이는 예후인자
윤태진,엄부섭,Tae-Jin Yoon,Boo-Sup Oum 대한안과학회 2005 대한안과학회지 Vol.46 No.3
Purpose: To determine the incidence and predisposing factors of a visual acuity of 0.5 or better after vitrectomy for proliferative diabetic retinpopathy. Methods: The factors that could affect visual acuity in 267 eyes of 215 diabetic patients who had undergone vitrectomy for proliferative diabetic retinopathy were calculated retrospectively. The factors were compared between 2 patient groups: postoperative visual acuity of 0.5 or better and of less than 0.5. The statistical significance of differences in factors between the 2 groups was calculated. Results: In 62 (23.2%) of the eyes, postoperative visual acuity was 0.5 or better. Univariate analysis revealed that the patients in the group with better visual acuity were younger, and had no macular detachment, no intraocular tamponade, low level of HbA1c preoperatively, and no cataract surgery (P<0.05). Multivariate analysis revealed that postoperative visual acuity of 0.5 or better was associated with no macular detachment, younger age, and a preoperative visual acuity of 0.1 or better. Conclusions: The patients who undergo vitrectomy for proliferative diabetic retinopathy complications are more likely to achieve visual acuity of 0.5 or better if they have not had macular detachment, are younger, and have a preoperative visual acuity of 0.1 or better.
A5J32/A5052 이종 알루미늄 합금 겹치기 마찰교반접합부의 인장성질에 미치는 재료배열 및 접합조건의 영향
윤태진,강명창,강정윤,Yoon, Tae-Jin,Kang, Myung-Chang,Kang, Chung-Yun 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
A5J32-T4 and A5052-H32 dissimilar aluminum alloy plates with thickness of 1.6 and 1.5 mm were welded by friction stir lap welding (FSLW). The FSLW were studied using different probe length tool and various welding conditions which is rotation speed of 1000, 1500 rpm and welding speed of 100 to 600 mm/min and material arrangement, respectively. The effects of plunge depth of tool and welding conditions on tensile properties and weld nugget formation. The results showed that three type nugget shapes such as hooking, void, sound have been observed with revolutionary pitch. This plunge depth and material arrangement were found to effect on the void and hooking formation, which in turn significantly influenced the mechanical properties. The maximum joint efficiency of the FSLWed plates was about 90% compared to base metal, A5052-H32 when the A5052-H32 was positioned upper plate and plunge depth was positioned at near interface between upper and lower plates.
W92-Ni-Fe 소결툴을 이용한 Cu-Ni 합금의 용접부미세조직과 경도 특성
윤태진,박상원,강명창,노중석,정성욱,강정윤,Yoon, Tae-Jin,Park, Sang-Won,Kang, Myung-Chang,Noh, Joong-Suk,Chung, Sung-Wook,Kang, Chung-Yun 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.3
In this study, the effect of the friction stir welding (FSW) was compared with that of the gas tungsten arc welding (GTAW) on the microstructure and microhardness of Cu-Ni alloy weldment. The weldment of 10 mm thickness was fabricated by FSW and GTAW, respectively. Both weldments were compared with each other by optical microstructure, microhardness test and grain size measurement. Results of this study suggest that the microhardness decreased from the base metal (BM) to the heat affected zone (HAZ) and increased at fusion zone (FZ) of GTAW and stir zone (SZ) of FSW. the minimum Hv value of both weldment was obtained at HAZ, respectively, which represents the softening zone, whereas Hv value of FSW weldment was little higher than that of GTAW weldment. These phenomena can be explained by the grain size difference between HAZs of each weldment. Grain size was increased at the HAZ during FSW and GTAW. Because FSW is a solid-state joining process obtaining the lower heat-input generated by rotating shoulder than heat generated in the arc of GTAW.
윤태진,김행석,오지원,김태흥 ( Tae Jin Yoon,Haeng Seok Kim,Chee Won Oh,Tae Heung Kim ) 대한피부과학회 1997 大韓皮膚科學會誌 Vol.35 No.5
Background: In Korea, especially in the Western Gyeongnam area, the exact prevalence and characteristics of skin tumors are unknown. The increasing incidence of skin cancer has been attributed to the increase iin exposure of the population to sunlight and other factors, such as chemicals or viruses. Objective : The aim of this study is the investigation of clinical and histopathological observation of cutaneous maligrant tumors in the Western Gyeongnam area. Mgthods : This study was based on the analysis of 125 cases of cutaneous malignant tumor patients between January, 1990 and December, 1996 at the Department of Dermatology, Gyeongsang National University Hospital. Results. The results are summarized as follows: 1. The mean incidence of cutaneous malignant tumors in the total number of outpatients was 0.15% (125/84,208). 2. The age of onset was quite varied but the majority of cases, 119 cases(95.2%), were over 40 years old. The ratio of men to women was 1.05:1. 3. Among the 125 cases of cutaneous malignant tumors, the most frequently observed tumor was basal cell carcinoma, 50 cases(40.0%). The next was squamous cell carcinoma, 42 cases(33.6%). 4. We observed three aases of metastasis in squamous cell carcinoma, basal cell carcinoma, and malignant melanoma. Two cases(squamous cell carcinoma and malignant, melanoma) were metastasized into the regional lymph nodes. One case(basal cell carcinoma) into the ribs. Conclusions : We investigated the clinical observations of 125 cutaneous malignant tumor patients in our clinic and made a comparative study. This data will be available for the study of cutaneous malignant tumors in the future. (Korean J Dermatol 1997;35(5): 956-962)
KS5J32 Al합금 마찰교반접합부의 인장성질에 미치는 접합조건의 영향
윤태진,김상주,김남규,송상우,강정윤,Yoon, Tae-Jin,Kim, Sang-Ju,Kim, Nam-Kyu,Song, Sang-Woo,Kang, Chung-Yun 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.5
The effect of welding condition on tensile properties of KS5J32 Al Alloy was investigated under various welding conditions. The 1.6 mm thick KS5J32 alloy sheets were joined by friction stir welding (FSW) technique with butt joint. The tool rotation speeds were 1000, 1250 and 1500 rpm, and the welding speeds were varied within the range from 100 to 600 mm/min. Voids mainly occurred at the advancing side of the tool probe, when the tool rotation speed was low, due to insufficient materials flow. When the weld pitch exceeded 0.4 mm/rev, voids were observed under all welding conditions and the area of voids increased with increasing weld pitch. For void-free specimens, fracture always occurred at base materials. However voids affected the location of fractures, base metal or welded zone, when the voids existed within the welds.
멜라닌세포에서 배양 성분에 따른 각종 표지자 발현의 차이
윤태진 ( Tae Jin Yoon ),김경태 ( Kyong Tae Kim ),김기호 ( Ki Ho Kim ),이진우 ( Jin Woo Lee ),이무형 ( Mu Hyoung Lee ) 대한피부과학회 2006 대한피부과학회지 Vol.44 No.5
Background: There are many growth media for cultivation of human melanocytes (MGM), depending on the supplements added, and the growth of cells is closely related to these components. To understand melanocytes in vivo, it is necessary to find out the biological or biochemical characteristics of melanocytes grown in physiologic growth medium (P-MGM) and phorbol-12-myristate 13-acetate (PMA)-containing medium (C-MGM). Objective: To investigate the expression of different biochemical markers of melanocytes grown in C-MGM and in P-MGM. Methods: C-MGM is basically composed of PMA (10 ng/ml), and bFGF (3 ng/ml), and is now commercially available for melanocyte culture. P-MGM is a physiologic growth medium containing physiologic mitogens such as bFGF (10 ng/ml), ET-1 (10 nM), and α-MSH (12 nM). The cell proliferation and the expression of biochemical markers were measured in cultured human melanocytes which were grown in either C-MGM or P-MGM. Results: In this study, there was significant difference in cell proliferation between cells grown in C-MGM and P-MGM (p<0.01). The tyrosinase activity and melanin contents were significantly increased in C-MGM. The expression of TRP1, MART-1 and p53 in mRNA level was higher in C-MGM than in P-MGM. The up-regulation of p53 protein expression was also observed in C-MGM. Conclusion: The proliferation and expression of p53, at both transcriptional and translational levels were increased when melanocytes were grown in C-MGM, compared to P-MGM. This data suggests that p53-mediated melanization is to some degree related with phorbol ester, and should further be elucidated. (Korean J Dermatol 2006;44(5): 579~585)
인삼의 수용성 추출물과 사포닌이 배양된 인체 각질형성세포 및 멜라닌세포의 성장에 미치는 영향
윤태진(Tae Jin Yoon),김낙인(Nack In Kim),박재경(Jai Kyung Park),허충림(Choong Rim Haw) 대한피부과학회 1994 대한피부과학회지 Vol.32 No.3
Background : Diagnosis of paucibacillary leprosy is difficult owing to lack of sensitive diagnostic tools. Recently, several investigators have studied the use of polymerase chain reaction(PCR) to detect Mycabacterium leprae. Using nested-PCR the sensitivity and specif city of DNA amplification is considerably improved. Objective : The purpose on investigation is to assess the efficacy if nested-PCR which is applied to formalin-fixed, paraffin-embedded biopsies material of patients with 1 prosy. Methods : Biopsy samples were taken from patients with lepremc tous(11 patients) and tuberculoid (10 patients) leprosy, fixed in formalin, and embedded in parafin. The DNA from samples was extracted and amplified through 25 cycles by using the outside pairs of primer(L and L). The second amplification was allowed thproceed through 15 cycles using insice gairs of primer(L and L4). Results : All twenty one samples showed 347-base-pair products. To confirm that the 347-bp product did correspond to the expected portion of the M. leprae groE gene, the amplified product was digested with Pst I. Pst I dipestion yielded 254-and 93-bp fragmerts, as predicted from the sequence of the M. leprae gene. The senilivity was that a single organism was idntified by nested-PCR. Conelusion : The nested-PCR is sensitive, specific, and simple diagiostic tool for leprosy. (Kor J Dermatol 1994; 32(3): 462-468)