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서정,한유희,김정오,이영신,Suh, J.,Han, Y.H.,Kim, J.O.,Lee, Y.S. 대한용접접합학회 1996 대한용접·접합학회지 Vol.14 No.1
The maximum butt-joint gap size in $CO_2$ laser beam welding of SAPH steel plates with different thicknesses and its bending formability were studied. In the range of the gap size$\geq$0.1mm, the optimal butt welding speed was faster than that of no gap (air gap) condition. This behaviour was independent on the difference of thickness at any combination. Also, the allowable gap size in steel plates with different thicknesses was larger than with same thicknesses. In the range of $T/T_0$(bead shape) $\geq$ 0.8, good bending formability was obtained at any combination of thickness. The formability was improved by reducing the hardness in weld bead using pre-heating process. Finally, FEM result of the laser beam welded underframe with different thicknesses was compared to that of the conventional spot welded underframe.
자동차 범퍼빔 경량화를 위한 레이저 용접 블랭크의 적용
서정(J.Suh),한유희(Y.H.Han),김정오(J.O.Kim),이문용(M.Y.Lee),이광현(K.H.Lee),김태일(T.I.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this paper. weldability and formability of Tailored-Blank (TB) and the structural impact testing of bump beam were investigated to apply TB to automobile bumper beam. The optimal CO₂ laser welding condition for TB of SPEC and SPRC steel plates with different thicknesses was obtained. Before welding, the cross section of butt joint was prepared only by shearing without milling process. Real type bump beam was produced by two kind of forming processes such as roll-forming and press-forming, and the good formability of TB was obtained. Impact test results of bump by using pendulum and barrier were satisfied the impact regulation of bump. Finally, It may be confirmed that laser welded TB is well-balanced material in both weight reduction and production cost of automobile bump.<br/>
김영진,김재준,유희 순천향대학교 1980 논문집 Vol.3 No.3
This is a report of leiomyoma combined with pseudodiverticulum in the esophagus The patient had suffered from epigastric discomfort and vomiting for about 7 years. The esophagogram showed that a chi1d fist sized well demarcated contrast retention was seen in the distal esophagus a little posteriorly and left laterally and slight dilatation was also noted in the lower esophagus A huge diverticulum on the distal esophagus was suspected with x-ray findings and clinical features. On March 17, 1980 a thoracotomy was performed and segmental resection of the esophagus including tumor mass was taken. It was diagnosed as a leiomyoma of the esophgus.
한유희,서무홍,이제훈,김정오 한국레이저가공학회 1999 한국레이저가공학회지 Vol.2 No.2
A RS840 CO₂ laser and a powder auto-feeding apparatus have been used to deposit single tracks of Ni-base superalloy on low carbon steel. In this paper, the effects of laser cladding parameters on clad geometry, dilution and microhardness are studied. As a results, the w/h ratio of the clad layer increases with decreasing powder feed rate and increasing laser scan, speed. Increase of powder density and decrease of specific energy have little effect on dilution. It was found that the clad layer of the highest hardness has a structure in which fine and leaf like phases are dispersed in γNi matrix.
일개 농촌지역의 주민이병실태에 관한 조사 : 경기도 남양주군 수동면 Su-Dong Myun, Nam Yang-Ju Gun, Kyung-Gi Do
강호경,김유희,서상아,조원식 이화여자대학교 의과대학 1984 梨花醫學誌 Vol.- No.16
A study on the morbidity status in a Korean rural community, Su-Dong Myun, Nam Yang Ju Gun, Kyung Gi Do was carried out from January 5, to 31, 1984 through analizing the medial records of Su-Dong Myun Health Subcenter during the period of January, to December, 1982 and the following results were obtained. 1) Population of Su-Dong Myun was 5,265 composed of 2,660 male and 2,605 female and the sex ratio was 102.2. 2) Population type of Su-Dong Myun was gourd type and depedency rate of Su-Dong Myun population was 60.8%. 3) The number of new patients visited to Su-Dong Myun Health Subcenter was 3,207 composed of 52.5% male, and 47.5% female during the year of 1982. 4) Annual morbidity rate in total was 609.1 per 1,000 population and 632.7 for male and 585.0 for female, and the highest age specific morbidity rate was 2,408.7 per 1,000 in the age group of 0-4 and the lowest was 238.3 per 1,000 in age the group of 15-19. 5) The order of five major diseases wese Diseases of the Respiratory System (33.9%), Diseases of Digestive System (20.2%), Diseases of the Skin and Subcutaneous Tissue (13.6%), Accidents. Poisoning. Violence (11.4%), and Diesases of the Nervous System and Sense Organs (8.4%). 6) The average visiting times of out patients in the Health Sub-Center was 1.8 per case. The range of average visiting times of diseases was 1.0 to 2.9. 7) The annual inhabitant utility rate of by Rie the Health Sub-Center was 609.1 per 1,000 population, and the highest rate was shown in Ribsuck 3 Rie (895.0), and the lowest in Nebang 2 Rie (215.3). 8) The monthly distribution of out patients visited to Su-Dong Myun Health Sub-Center was shown the highest rate in July (65.3 per 1,000 population) and the lowest in January (28.5). 9) The proportion of medical fee of patients visited to Health Sub-Center by sources were 78.2% of patients was paid by Su-Dong Myun Community Health Development Association and patient self, 14.8% by Government Medicaid Program, and 13.2% by Medical Insurance. 10) Average medial fee per first visiting was 2,690 + 4,446(\) and average medical fee per case was 4,210 ± 3,886 (\).