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김병희(Byeong-hee Kim),김헌영(Heon-young Kim),김호(Ho Kim),김광순(Kwang-soon Kim),강신일(Shin-ill Kang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The hot embossing process has been mentioned as one of major nanoreplication techniques. This is due to<br/> its simple process, low cost, high replication fidelity and relatively high throughput. As the initial step of<br/> quantitating the embossing process , simple parametric study about embossing time have been carried out<br/> using high-resolution masters which patterned by the DRIE process and laser machining. Under the various<br/> embossing time, the viscous flow of thin PMMA films into microcavities during compression force has been<br/> investigated. Also, a study about simulating the viscous flow during embossing process has planned and<br/> continuum scale FDM analysis was applied on this simulation. With currently available test data and<br/> condition, simple FDM analysis using FLOW3D was made attempt to match simulation and experiment.
난치성 복수를 동반한 간경변증 환자의 혈장 Aldosterone 치
서정일(Jeong Ill Suh),김영진(Young Jin Kim),이태일(Tae Il Lee),이재성(Jae Sung Lee),김기덕(Ki Duk Kim),권준영(Jun Young Kweon),김병훈(Byeong Hun Kim),김기윤(Ky Yun Kim),박종원(Jong Won Park),이헌주(Heon Ju Lee) 대한내과학회 1994 대한내과학회지 Vol.46 No.5
N/A Objectives: Hyperaldosteronism is the most important factor in sustaining salt and water retention in patients with cirrhosis and aldosterone antagonists or loop natriuretic agents are used for the treatment of ascites. But some patients do not respond to the dietary diuretic regime and the cause or mechanism of refractory ascites complex. To evaluate the difference in response after treatment of ascites and the importance of plasma aldosterone level in refractory ascites, pretreatment plasma aldosterone concentration and the degree of cirrhosis by Child-Pugh classification were investigated among cirrhotic patients. Methods: Plasma renin activity (PRA), plasma aldosterone concentration (PAC) and 24 hour urinary Na+ excretion (Una+V) were tested in 16 normal control (group I), 16 cirrhotic patients without ascites (group II), 29 cirrhotic patients with ascites who responded to aldosterone antagonist (group III) and 12 cirrhotic patients with refractory ascites (group IV). Results: The amount of Una+ in group IV (19.1±13.0 mmol/day) was much lower than that of group I (81.8±42.2mmol/day), group II (75.1±12.5mmol/day), and group III (74.9±47.8 mmol/day) (p<0.01). PRA and PAC in group III (10.8±4.1ng/ml/hr, 359.8±196.8pg/ml) and group IV (12.5±8.7ng/ml/hr, 585.9±323.7pg/ml) were significantly elevated as compared to group I (1.5±0.8ng/ml/hr, 127.0±69.1pg/ml) (p<0.01 and p<0.05, respectively) and group II (4.3±2.1ng/ml/hr, 198.8±50.8pg/ml) (p<0.01 and p<0.05, respectively). But no remarkable differences were noted between group III and group IV in PRA and PAC. No negative correlations were noted between Una+V and PRA, or between Una+V and PAC in cirrhotic patients. According to Child-Pugh classification, the majority of the group IV were in C. Conclusion: Hyperaldosteronism itself is not the main cause of low sodium excretion in cirrhosis with refractory ascites. Some other factors related to the advanced cirrhosis may play a major role in the mechanism of diuretics resistance in refractory ascites.
고장력강 파이버 레이저 용접부의 HAZ 연화 특성에 관한 연구
박민호(Min-Ho Park),김일수(Ill-Soo Kim),이종표(Jong-Pyo Lee),진병주(Byeong-Ju Jin),김도형(Do-Hyeong Kim),김인주(In-Ju Kim),김지선(Ji-Sun Kim) 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.6
Laser welding sector in the automotive industry has been widely recognized as one of the most important bonding processes, such as parts welding. Efforts to improve productivity and weld quality have been progressing steadily. In addition, laser welding is suitable for welding process that can produce high-quality welds suitable for flexible production and small quantity batch productions. In order to ensure the rigidity of the material, high strength material are applied to more than 1 GPa class body parts and automotive bumper beams. However, not only the situation is that the trend of domestic research, but also development is based on product molding considering freedom of shape where reinforcement is applied to meet the safety regulations and high-speed crash performance, despite the use of high strength materials. The tendency for heat-affected zone (HAZ) softening phenomenon common in areas of laser welded high tensile steel welding confirmed the occurrence of weld softening effect according to the process parameters. Based on this, range of process parameters could be selected for ensuring weld quality.