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齒科 임플랜트 補綴의 審美的 修復 方法에 따른 應力分析의 有限 要素法的 硏究
김장웅,조인호 대한치과이식임플란트학회 1992 The Korean Academy of Implant Dentistry Vol.12 No.1
The long-term success of any dental implant is dependent upon the optimization of stresses which occurs during oral functing and parafunction. Although there have been many studies to examine the bicomplatibilites between dental implants and living tissue, few studies have been reported on the biomechanics of dental implants. The purpose of this study was to qualitatively analyze the stress distribution of esthetic restorations in osseointegrated implants. The finite element models were Branemark Implant conventional system, EsthetiCone Abutment, Anatomic Abutment and UCLA Abutment. The Branemark implant fixtures(3.75mm in diameters, 10 mm in length) were used in 4 models. Two dimensional finite element analysis was used for this study. The softwares were Super SAP (Algor Inc.) for IBM 32 Bit Computer. The results were as follows ; 1. The stresses were concentrated at the neck of the implant in all models and the face may be closely related with the initial resorption of cortical bone at neck site. 2. In cases of Branemark implant conventional system and EsthetiCone Abutment, the stress concentrations at the base of implant were around the axis of implant, but in Anatomic Abutment and UCLA Abutment, they were diffuse around the apex of implant. 3. In maximum stress, Branemark implant conventional system was the lowest value, and UCLA Abutment was the highest. 4. In Branemark implant conventional system, EsthetiCone Abutment, and Anatomic Abutment, maximum stresses were at the neck of the implant and bone, but it was at the base of impaltn in UCLA Abutment. 5. The stresses were almost linearly propotional to the amount of load.
장웅성,김숙환,장래웅,엄기원 대한용접접합학회 1988 대한용접·접합학회지 Vol.6 No.3
In fabrication of various welded structures made of high strength steels, the occurence of hydrogen assisted cracking and embrittlement in HAZ is prime importance. The present work was carried out to clarify the effect of chemical compositions, especially B and/or Ti addition on the cold cracking susceptibility and HAZ embrittlement in low crabon equivalent steel. Tests results showed that the addtio of optimum boron content in steel with low Pem value i.e., below 0.20 % was the best way to improve the weldability as well as the mechanicla properties of $60kg/mm^2$ grade quenched and tempered high strength steels.
患者에서 分離한 Salmonella菌과 自然界(河川水)에서 分離한 Salmonella菌의 名種 抗菌劑에 對한 比較檢討
金英夫,金二鎬,朴長雄 中央醫學社 1976 中央醫學 Vol.30 No.3
The authors was carried out in order to evaluate the sensitivity of the different chemotherapeutic agents including chloramphenicol to Salmonella group isolated from the stool of the patient's diarrhea (2 strains of S. typhi, 4 strains of S. pa?ratyphi B), and from the, sewages in Busan during four months from July to October in 1974 (3 strains of S. typhi, 4. strains of S. paratyphi A). Sensitivity test used with high concentration chemoptherapeutic agents (Paper disk used Eiken Chemical Co., Tokyo, Japan). The results obtained were as follows: 1. S. typhi and S. paratyphi A isolated from the sewages were sensitive to sulfi?soxazole and chloramphenicol. And with exeception of, the these sulfisoxazole and chloramphenicol were resistant to all used chemotherapeutic agents. 2. The sensitivity pattern of the isolated strains from the stool of the patient's diarrhea of S. typhi and S. paratyphi B were sensitive to chlorampheniol, tetracycline, dihydrostreptomycin, kanamycin and colistin, but, penicillin erythromycin, oleandomycin, leucomycin were resistant.
김진한,김우중,이경용,임규성,신도영,장웅기,조근태 대한소화기내시경학회 1989 Clinical Endoscopy Vol.9 No.1
Authors analysed 42 cases of gastric xanthoma, confirmed by gatroscopic biopsy, at Kangnam Sacred Heart Hospital, College of Medicine, Hallym University from March 1986 to December 1988 The results were as follows; 1) The prevalence of gastric xanthome was 0.9% in 7699 consecutive gastroacopies. 2) The prevalence of gastric xanthoma increased with age. 3) The frequent locations of gastric xanthoma were the antrum (56%) and the lower bady (29%). 4) The most frequent gastroduodenal lesion associated with gastric xanthoma was chronic superficial gastritis (77%). 5) The average level of cholosterol was 169.9 mg/dl, triglyceride was 102.6 mg/dl, and no conelation existed between the serum cholesterol or triglyceride level and the presence of gastric xanthoma.
펄스형 Nd:YAG 레이저 빔에 의한 Inconel Tube의 용접
김재도,장웅,정진만,김철중,Kim, J.D.,Chang, W.,Chung, J.M.,Kim, C.J. 대한용접접합학회 1999 대한용접·접합학회지 Vol.17 No.1
The basic remote sleeve repair-welding technology by the pulsed Nd:YAG laser for increasing the lifetime of the steam generator tube in a nuclear power plant has been developed. The relationship between the connection width and welding parameters have been investigated for the fundamental research to apply the sleeve-repair-welding technique to the nuclear industry. The Inconel 600 tube and Inconel 690 sleeve used for high temperature and high pressure service were welded as round lap welding by Nd:YAG laser. It was observed that the tensile shear strength, 340MPa of the welded specimen is equivalent to about 60% of that of the base metal (Inconel 600), 550MPa. The difference between the hardness of the base metal and that of the laser welds was about 10%. Ductile fracture was partly occurred in the weld but the cracking has not been observed. In spite of absence of the crack, the strength of welds was not sufficient in terms of the tensile shear strength.
길장웅(Jang Ung Kil),김성천(Sung Chun Kim) 한국정보과학회 1988 한국정보과학회 학술발표논문집 Vol.15 No.2
Benes와 Clos 네트워크는 N 입력과 N 출력에 대한 모든 N! 순열을 제공할 수 있는 완전 조합 능력(full combinatorial capability:FCC)을 갖는다. FCC를 갖는 네트워크로서 이와 또 다른 부류로 Cellular 순열 네트워크(cellular permutation networks : CPN)가 있는데, 본 논문은 이 CPN의 한 부류인 KLW 네트워크에 대한 오류 진단의 연구 결과로 오류 발견은 네트워크의 크기 N에 관계없이 6번의 테스트로서 가능함을 보였고, 오류 위치는 네트워크의 크기 N에 관계없이 7번의 테스트후에 결정할 수 있음을 증명하였다. 또한 다중 오류(multiple faults)에 대해서는 오류의 감지 만을 다루었으며, 이에 대한 테스트의 상한값이 2(N+1)이 됨을 보였다.