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시편 예열 온도가 FCW 용착금속의 확산성 수소량에 미치는 영향
김동윤,황인성,김동철,강문진,Kim, Dong Yoon,Hwang, In Sung,Kim, Dong Cheol,Kang, Moon Jin 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.2
Cold cracking of weldment is one of the most serious welding problems. A sufficient quantity of diffusible hydrogen, a residual stress, and a sensitive microstructure are the causes of cold cracking. Removal of any one of these factors can be used to prevent cold cracking. Application of flux cored arc welding process is increasing due to high productivity and easiness of welding. In addition, to prevent cold cracking in the HAZ or weldment, preheat temperature and interpass temperature have to be controlled. In this study, the effect of preheat temperature on the levels of diffusible hydrogen in the weld metal deposited using flux cored wire was examined. The levels of preheat temperature of base metal specimen were ambient temperature, 50, 100 and $150^{\circ}C$ respectively. The result showed that the increase of preheat temperature was a linear relationship with reduction of diffusible hydrogen content in weldment.
마이토마이신을 이용한 라섹 수술 후 지연성으로 발생한 비대 각막 반흔 2예
김동윤,김명준,윤삼영,신철진,김경훈,차흥원,Dong Yoon Kim,MD,Myoung Joon Kim,MD,PhD,Sam Young Yoon,MD,Chul Jin Shin,MD,Kyoung Hoon Kim,MD,Hungwon Tchah,MD,PhD 대한안과학회 2009 대한안과학회지 Vol.50 No.2
Purpose: To report late-onset hypertrophic corneal scars after laser epithelial keratomileusis (LASEK) with mitomycin C. Case summary: Case 1. A 34-year-old man who had undergone LASEK with mitomycin C 15 months prior was referred to our clinic because of corneal opacity of his right eye. After LASEK, there have been no abnormalities in either of his eyes. However, 11 monthsafter LASEK, he experienced decreased visual acuity in his right eye. The visual acuity was 0.03 in his right eye and 1.0 in his left eye. On slit lamp examination there was a whitish, hypertrophic scarin his right cornea. The lesion was located in the corneal center and the subepithelial space. Central corneal thickness was 828 μm. Case 2. A 23-year-old woman who had undergone LASEK with mitomycin C 14 months before was referred our clinic because of corneal opacity of her left eye. After LASEK, there had been no abnormalities in either of her eyes. However, 12 months after LASEK she experienced decreased visual acuity in her left eye. The visual acuity was 1.0 in her right eye and 0.2 in her left eye. On slit lamp examination there was a whitish, hypertrophic scar in her left cornea. Central corneal thickness was 794 μm. Conclusions: Manual debridement was performed to remove the hypertrophic scar in both cases. Case 1. After manual debridement, visual acuity of the right eye improved to 0.63. Case 2. After manual debridement, best-corrected visual acuity of the left eye was 0.63.
플럭스 코어드 와이어에 따른 용접 중 콘택트 팁 내마모성 평가
김동윤,황인성,김동철,강문진,Kim, Dong-Yoon,Hwang, In-Sung,Kim, Dong-Cheol,Kang, Moon-Jin 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.4
The contact tip for flux cored arc welding has important functions to transmit the welding current to the wire and to guide the wire to molten pool. A damaged contact tip causes a productivity reduction and a welding quality problem. In this study, the welding experiments for the wear resistance of contact tip regarding flux cored wire types were performed. With two fold type and a seamless type flux cored wires, the wear rates of contact tips were compared. In addition, the wear rate was checked according to the contact tip position.
부분결합간섭계에 내장된 인공수정체 도수측정 공식들의 정확성 비교
김동윤,김명준,김재용,차흥원,Dong Yoon Kim,MD,Myoung Joon Kim,MD,PhD,Jae Yong Kim,MD,PhD,Hungwon Tchah,MD,PhD 대한안과학회 2009 대한안과학회지 Vol.50 No.4
Purpose: To evaluate the accuracy of various formulas installed in IOLMaster software which uses partial coherence interferometry for axial length measurement. Methods: This retrospective comparative study included 81 eyes of consecutive patients who had uneventful cataract surgery with implantation of Acrysof single piece (SA60AT) IOL. Axial length was measured with IOLMaster and IOL power was calculated using various formulas, including SRK II, SRK/T, Holladay 1, Haigis, and Hoffer Q. Subjects were stratified by axial length into Groups A (axial length < 23.50 mm), B (23.50 mm ≤ axial length < 25.00 mm), and C (axial length ≥ 25.00 mm). Target refractions of the five formulas were compared to the postoperative manifest refraction at 1 month. Results: The five formulas showed no difference in predicting postoperative refractive errors among all of the groups. Conclusions: Five formulas installed in IOLMaster software provided equivalent predictions of postoperative refractive error regardless of axial length. J Korean Ophthalmol Soc 2009;50(4):523-528
김동윤,황인성,김동철,강문진,Kim, Dong Yoon,Hwang, In Sung,Kim, Dong Cheol,Kang, Moon Jin 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.6
The contact tip for gas metal arc welding has important functions to transmit the welding current to the wire and to guide the wire to molten pool. If the contact tip is damaged, it is a cause of lowering the welding productivity due to removal of welding defects and replacement of contact tip. In case of the use of a contact tip for a long time the arc is unstable because the processed hole in the contact tip center is larger, and the variation of aiming position of the welding wire causes a seam tracking error. In this study, gas metal arc welding experiments using contact tip of three different materials were performed. The contact tips with Cu-P, Cu-Cr, and Cu-ODS were used at the experiments, and the welding characteristics by each contact tip were evaluated. After welding contact tip appearance, welding spatter adhesion amount of the nozzle, and weld bead appearance were evaluated. The welding current and welding voltage were measured to verify arc stability during arc welding.
마을 만들기 연구의 정량적 접근에 관한 소고 - 마을 만들기 사업규모와 성과의 관계를 중심으로 -
김동윤,김선직,강래천,Kim, Dong-Yoon,Kim, Sun-Jick,Kang, Rae-Cheon 한국디지털건축·인테리어학회 2011 한국디지털건축인테리어학회 논문집 Vol.11 No.2
Skeptical responses to urban design based on the Physical Planning theory assuming the existence of social agreement and the absolute authorities of planners bring about alternatives such as Participatory Planning and Community Design derived from Harbermas' Communicative Rationality. But the normative contentions do not progress any more to the stage of presenting practical strategies. This is the cause why there should be systematic approaches to reveal the relationships among various concepts or variables. With regard to the Community Design this study intends to take a statistical approach to find relationship between project scale and its accomplishment. The hypothesis that the smaller scale of project begets the better outcomes was tested to be rejected as a result of the analysis of variance. But the result also shows that appropriate density in relatively large area makes residents' expected satisfaction high. Although this discovery has its own meaning the tryout is anticipated to laying the cornerstone of quantitative analyses in the following studies.
원격 스캐너를 이용한 알루미늄 레이저 용접에 대한 생산 공정 최적화 설계
김동윤,박영환,Kim, Dong-Yoon,Park, Young-Whan 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.6
In this study, we conducted laser welding by using remote scanner that is 5J32 aluminum alloy to observe the mechanical properties and optimize welding process parameters. As the control factors, laser incident angle, laser power and welding speed were set and as the result of weldablility, tensile shear tests were performed. ANOVA (Analysis of Variation) was also carried out to identify the influence of process variables on tensile shear strength. Strength estimation models were suggested using regression alnalysis and 2nd order polynomial model had the best estimation performance. In addition optimal welding condition was determined in terms with wedalility and productivity using objective function and fitness function. Final optimized welding condition was laser power was 4 kW, and welding speed was 4.6 m/min.