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탄소섬유 / 에폭시 복합재료의 파괴에너지에 미치는 PH , Strain Rate 및 섬유 부피분율의 영향
이재영,최형기,심미자,김상욱 ( J . Y . Lee,H . K . Choi,M . J . Shim,S . W . Kim ) 한국공업화학회 1995 공업화학 Vol.6 No.3
탄소섬유/에폭시수지 복합재료의 파괴에너지에 미치는 pH, strain rate 및 섬유부피분율의 영향을 연구하였다. pH 2-12 범위에서 strain rate를 2.37×10^(-3) sec^(-1)부터 23.67×10^(-3) sec^(-1)까지 변화를 시켰으며, 섬유부피분율은 0∼0.09이었다. Three point bending 시험에 의해 시편을 파단시킨 후 섬유의 debond된 길이와 pull-out된 길이를 ZPM 법에 의해 구하였다. 본 계의 파괴에너지는 주로 pull-out energy가 가장 크게 나타나며, pH 7인 경우가 pH 2, 12인 경우보다 더 큰 값을 나타내었다. 그리고, strain rate 및 섬유부피분율이 증가함에 따라 파괴에너지가 증가하였다. The effects of pH, strain rate and fiber volume fraction on the fracture energy of carbon fiber/epoxy composites were investigated. The range of strain rate was from 2.37×10^(-3) sec^(-1) to 23.67×10^(-3) sec^(-1), that of pH was 2 to 12 and fiber volume fraction was 0 to 0.09. Fracture of the specimen was carried out by three point bending test and fiber debonded length and pull-out length were measured by Zeiss projection microscope. Pull-out energy gave a major contribution to the fracture energy. The fracture energy at pH 7 was larger than those at pH 2 and pH 12. Fracture energy increased with the increase of strain rate and fiber volume fraction.
ISO/TC 112 Vacuum Technology 국제표준 활동
홍승수,신용현,김진태,정광화,최형기,김익수,박완용,Hong, S.S.,Shin, Y.H.,Kim, J.T.,Chung, K.H.,Choi, H.K.,Kim, I.S.,Park, W.Y. 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.6
국제표준화기구 (International Organization for Standardization, ISO)의 기술위원회의 하나인 ISO/TC 112 (진공기술위원회)에서는 진공펌프, 진공장치, 진공부품 분야의 진공기술의 표준화를 하고 있다. 본 논문에서는 국제표준화기구에 대한 간략한 소개와 함께 진공기술위원회 ISO/TC 112의 조직과 표준화 규격제정절차나 방법 등을 요약하였으며, 또한 국내에서 최근에 제안한 "열음극 진공게이지 사양"과 "진공밸브시험절차" 핵심내용도 간략히 소개하였다. 국제표준화에 대한이해를 돕고 최근 상황을 소개함으로서 한국에서 더 활발히 진공기술이 발전하고 국제표준화를 선도하는데 도움이 되고자 한다. International Standardization for Vacuum pumps, vacuum instruments, and vacuum components has been established at ISO/TC 112 which is a technical committee of ISO (International Organization for Standardization) in the area of vacuum technology. This report shortly summarizes the structure of ISO/TC 112 and its activities on the standardization for vacuum technology. Also it introduces the brief contents of "specifications for hot cathode ionization gauges" and"Test procedure for vacuum valves" which are recently accepted as new proposals. These information on ISO/TC 112 would contribute to activate the development of vacuum technology as well as the participation for the international standardization in Korea.
Cavernospogiosum Shunt를 施行한 陰莖持續勃起症의 治驗 1例
李浩善,李鎭?,崔馨基,權誠遠,王宗舜 中央醫學社 1973 中央醫學 Vol.25 No.3
Priapism is a condition in which persistent erection occurs unaccompanied by sexual excitation or desire. The patient was 29 year-old teacher. Priapism developed by trauma on 15 days prior to admission. The condition was not subsided by supportive measures including sedation, heparinization, administration of enzymes, and local irrigation with normal saline containing heparin. On admission 8th day, cavernospongiosum shunt operation was performed. After the operation the penis was gradually becoming flaccid, and completely flaccid penis was noted on the postoperative 7th day. The patient was discharged from the hospital on the postoperative 14th day. After discharge the patient was checked at the O.P.D. weekly and erection of the penis recovered to normal on 2 months later.
李浩善,崔承庚,崔馨基,이진무,王宗舜 中央醫學社 1973 中央醫學 Vol.24 No.5
Kanendomycin is a new broad-spectrum antibiotic. It is a water-soluble basic, antibiotic, developed by a research group of Mei ji Seika Kaisha, Ltd. Authors treated 60 cases (male 42, female 18) of urinary infections in acute or chronic with 200mg or 400mg daily dose of intramuscular Kanendomycin for 5-10 days and report a clinical and bacteriological cure rate of 85%. We consider this drug to be one of the most effective antibiotics in the treatment of urinary infections because Kanendomycin has high effectiveness against various bacteria and various antibiotic resistant strains, and the excretion rate in urine of intramuscular Kanendomycin is high, and it has little toxic or side effect.
상용화제 SEBS-g-MA가 PA6/PP-g-MA 블렌드계의 나노 고차구조에 미치는 영향
고재송,이창형,최형기,한애란,나재운 한국공업화학회 2003 공업화학 Vol.14 No.3
Polyamide 6 (PA6)/maleated polypropylene (PP-g-MA) 블렌드계의 상용화제로 maleic anhydride (MA)가 그래프트(graft)된 poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS-g-MA)를 첨가하여 블렌드의 고차구조에 미치는 영향을 small angle x-ray scattering, DSC 및 SEM을 이용하여 고찰하였다. SEBS-g-MA가 첨가된 시료는 첨가되지 않은 시료보다 PA6분상의 크기가 작았는데 이는 가공 또는 열처리 중 SEBS-g-MA의 무수말레산과 PA6의 아민 그룹(amine group) 사이에 반응이 일어나 PA6/PP-g-MA 계면에 PA6-SEBS-g-MA 그래프트 공중합체가 형성되어 이 공중합체가 상용화제로서 작용하여 계면장력을 안정화시켜 PA6 분산상 크기를 작게 한 것으로 추정되었다. 첨가된 SEBS-g-MA의 일부는 마이크로 상분리(Micro-phase separation)되어 미세 분산상으로 존재하게 되는데 그 크기는 첨가된 양이 많을수록, 저온보다 고온일수록 크다는 것이 관찰되었다. 미세 분산상 SEBS-g-MA는 PP-g-MA 연송상의 결정화도를 낮추는 반면, PA6 분산상의 결정화도는 증가시켰다. Effect of maleic anhydride grafted triblock copolymer of poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS-g-MA) on the morphology of the blends of polyamide 6 (PA6) and maleated polypropylene (PP-g-MA) was investigated by small angle x-ray scattering, differential scanning calorimeter and scanning electron microscopy. The size of the dispered PA6 decreased with addition of SEBS-g-MA. SEBS-g-MA reacted with the amine group of PA6 during the melt-compounding, and as a result, the copolymer, formed by interfacial reaction between PA6 and SEBS-g-MA, led to reduction in size of the dispersed PA6. SEBS-g-MA was partially microphase-separated to dispersion phase, and its size increased proportional to the amount of added SEBS-g-MA and increased temperature. The microphase-separated dispersion phase highly affected the crystallinity of the PP-g-MA matrix and PA6 dispersion.
김상욱,이재영,심미자,최형기,옥성현 한국공업화학회 1998 응용화학 Vol.2 No.1
The properties of recycled PVC from instrument panel in end-of-life vehicle were studied. With the increasing content of virgin PVC, tensile strength and elongation were increased, and Young's modulus and density were little affected. The Shore A hardness was decreased with the addition of virgin PVC. The virgin PVC compensated the properties of recycled PVC.