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김경훈 한국비쥬얼디자인학회 1999 한국디자인포럼 Vol.4 No.-
In the 21st century knowledge-and-information-oriented age, individual diversity is emphasized, and information acquisition and consumption levels are heightened. This trend of the times refuses to accept the mass production system centering around the competition in price. In consequence, inevitably does come the age of value created in which quality goods are produced by the multikind and small quantitiy production system. Design along with information and communication as 21st century knowledge-based business is gaining ground as a main factor national competitiveness is dependent upon in this age. Accordingly, the purpose of this study is to analyze the process and realities of the establishment of a firm specialized in venture design, both one of knowledge-based business and one factor which decides whether in the knowledge-and-information-oriented age, the millennium, our country will gain ground as one of the leading countries in the world or it will set in the west just like the twilight of the 20th century, and try to pave the way to promote the establishment of design venture required by this age. In a knowledge-based economic society, working methods are more important than working hours, and technical knowledge is more important than general knowledge. Desire for self-achievement is to be stronger than unilateral sense of loyalty to an organization. For the country in which there are many men of great originality who can enhance value added through incessant self-improvement, self-development and self -reformation can secure competitiveness among nations in the upcoming century.
김경훈,이승희,권재영,김해규,정규섭,김인세 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.29 No.6
The method of cryogenic brain edema has been used popularly for the study of experimental brain edema which is similar to vasogenic brain edema due to traumatic brain damage. After experimental cryogenic cerebral injury, severe focal brain contusion will be developed due to BBB breakdown and vasogenic cerebral edema formation. This study has been conducted to find out the index of other studies of brain edema by watching the time courses of cryogenic brain edema in rats. Forty five rats of either sex weighing 277±5 g(mean±SD) were freely drunken and fed till just before operation. Anesthesia was induced in a plastic box with 5% halothane in oxygen and then 1mg/kg of 0.5% urethane was injected into the peritonial cavity. The skull was exposed by a midline incision after infiltration of 2% lidocaine(total dose, $lt;10 mg) and skull was reflected bilaterally. A funnel, an attached side of which was 5 mm in diameter, was attached on the left temporo-parietal area with epoxy glue. All rats were randomly selected in one of the two groups; Edema Group(40 rats) for the evaluation of brain edema and Barrier Group(5 rats) for the evaluation of integrity of BBB. Edema group was subdivided into 8 subgroup(5 rats in each group) according to the decapitation time in control, 15, 30, 45, 60, 90, 120, and 180 min. In edema group, cryogenic brain injury was made by pouring liquid nitrogen into the funnel for 60 seconds and then the brain was quickly removed at 0, 15, 30, 45, 90, 120, and 180 minutes after liquid nitrogen exposure. The cerebellum and brain stem caudal to the colliculi were discarded, and the cerebral hemisphere was separated. According to dry-weight method, the water contents of each hemisphere were measured. Data were analyzed by a one-way ANOVA test. In barrier group, the method of cryogenic brain injury was same as edema group and 0.5 ml of 3% Evans Blue was injected via right femoral vein just before exposure of liquid nitrogen. At 60 minutes after the cryogenic brain injury, the perfusion fixation was done and the brain was quickly removed and stored in the 10% formalin solution. The water contents of each hemisphere were proved to be similar with those of previous studies even through the conditions of dry-weight method were different. In this study, the amount of brain edema was increased till 90 minute after cryogenic brain injury and then decreased as time went by. From these results, the method of experimental brain edema after cryogenic brain injury is a good guidance of BBB breakdown and vasogenic brain edema study.(Korean J Anesthesiol 1995; 29:770~776)
방전플라즈마 소결법에 의한 탄화 붕소 세라믹스의 소결 거동 및 기계적 특성
김경훈,채재홍,박주석,김대근,심광보,이병하,Kim, Kyoung-Hun,Chae, Jae-Hong,Park, Joo-Seok,Kim, Dae-Keun,Shim, Kwang-Bo,Lee, Byung-Ha 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.1
[ $B_4C$ ] ceramics were fabricated by spark plasma sintering process and their sintering behavior, microstructure and mechanical properties were evaluated. Relative density of $B_4C$ ceramics could be achieved by spark plasma sintering method reached as high as 99% at lower temperature than conventional sintering method, in addition, without any sintering additives. The mechanical properties of $B_4C$ ceramics could be improved by the heat treatment at $1300^{\circ}C$ during sintering process which can be removed $B_2O_3$ phase from a $B_4C$ powder surface. This improvement results from the formation of a fine and homogeneous microstructure because the grain coarsening was suppressed by the elimination of $B_2O_3$ phase. Particularly, mechanical properties of the specimen experienced the $B_2O_3$ removing process improved over 30% compared with the specimen without that process.
방전플라즈마 소결법을 이용한 고밀도 탄화 붕소 제조 및 기계적 특성
김경훈,채재홍,박주석,김대근,심광보,Kim, Kyoung-Hun,Chae, Jae-Hong,Park, Joo-Seok,Kim, Dae-Keun,Shim, Kwang-Bo 한국결정성장학회 2007 한국결정성장학회지 Vol.17 No.3
방전플라즈마 소결법을 적용하여 탄화붕소 세라믹스를 제조하여 그 소결 특성, 미세 구조 및 기계적 특성을 평가하였다. 탄화붕소의 소결에 방전플라즈마 소결법을 적용하여 소결 조제의 첨가 없이 전통적인 소결법보다 낮은 온도에서 99% 이상의 완전 치밀화된 소결체를 제작할 수 있었으며, 탄화붕소 분말의 메탄을 세척을 통하여 분말 표면에 형성되어 있는 $B_2O_3$ 상을 사전에 제거함으로써 결정립의 조대화를 방지하여 균일한 미세구조의 형성을 유도할 수 있었으며 결과적으로 탄화붕소 소결체의 기계적 특성을 향상시킬 수 있었다. 특히 파괴인성의 경우 메탄을 세척을 통하여 30% 이상의 물성 향상을 달성하였다. [ $B_4C$ ] ceramics were fabricated by spark plasma sintering process and their sintering behavior, microstructure and mechanical properties were evaluated. Relative density of $B_4C$ ceramics were obtained by spark plasma sintering method reached as high as 99% at lower temperature than conventional sintering method, in addition, without any sintering additives. The mechanical properties of $B_4C$ ceramics was improved by a methanol washing process which can be removed $B_2O_3$ phase from a $B_4C$ powder surface. This improvement results ken the formation of homogeneous microstructure because the grain coarsening was suppressed by the elimination of $B_2O_3$ phase. Particularly, fracture toughness of the sintered specimen using a methanol washed powder improved over 30% compared with the specimen using an as-received commercial powder.