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유한요소법을 이용한 용접부의 열전달 및 잔류응력 해석에 관한 연구
김일수,김인권,문채주,정영재,안영호 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.5
This paper represents to develop a computer software system which is capable to analyze the phase transformation of high strength steel(BV-AH32) and to predict heat transfer and welding residual stress due to phase transformation during Gas Metal Arc(GMA) welding. The developed model was considered temperature dependent properties such as young's modules, coefficient of thermal expansion and yield stress as well as the double ellipsoidal heat distribution by the moving arc. From the results, it was found that the longitudinal and transverse residual stresses calculated by the coupled analysis of heat transfer, residual stress and phase transformation showed good agreement with the experimental data. In addition, the temperature distribution as well as longitudinal and transverse residual stresses of weldment by the 1-pass and 2-pass of welding were also determined.
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
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.
( Kyung Hoon Kim ),( Byoung Kuk Jang ),( Woo Jin Chung ),( Jae Seok Hwang ),( Young Oh Kweon ),( Won Young Tak ),( Heon Ju Lee ),( Chang Hyeong Lee ),( Jeong Ill Suh ) 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3
Background/Aims: Pegylated interferon (peginterferon) and ribavirin combination therapy is less effective and associated with a higher frequency of serious complications in chronic hepatitis C patients with cirrhosis than in noncirrhotic patients. This study evaluated the efficacy and tolerability of peginterferon and ribavirin treatment in patients with hepatitis C virus (HCV)-related cirrhosis. Methods: Eighty-six patients with clinically diagnosed liver cirrhosis were treated with either peginterferon alpha-2a (n=51) or peginterferon alpha-2b (n=35) plus ribavirin. The sustained virologic response (SVR) and adverse effects were analyzed retrospectively. Results: Of the 86 patients (55 males), 48 patients (55.8%) had HCV genotype 1 infection and 38 (44.2%) had genotype non-1 infection. The overall SVR rate was 34.9% (30/86), and the rates of SVR in the genotype 1 and non-1 patients were 20.8% (10/48) and 52.6% (20/38), respectively. The multivariate analysis revealed that having HCV genotype 1 (P=0.003) and high baseline viral load (>8.0×10(5) IU/mL, P=0.012) were the independent predictive factors for SVR failure. In 20.9% (18/86) of the patients, treatment was not completed due to adverse events (27.8%), loss to follow-up (50.0%), and other reasons (22.2%). Conclusions: Peginterferon and ribavirin combination therapy was relatively effective and feasible for clinically diagnosed HCV patients, especially in those with genotype non-1 infection and low baseline viral load. (Korean J Hepatol 2011;17:220-225)
배덕권(Duck Kweon Bae),김동훈(Dong-Hun Kim),박중신(Jung-Shin Park),이동영(Dong-Young Lee),이성일(Sung Ill Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.5
As modern industrialized society progresses, the demand for electric power is increasing rapidly. The electric power system is getting amazingly bigger and complicated, which can easily induce serious troubles from the potential of large fault problems and/or system failure. The monitoring and diagnosis of the electric machine for the fault detection and protection has been important part in the electric power system. Most faults in the generator appear in the winding. This paper presents the air-gap magnetic flux characteristic of a small-scale 2-pole synchronous generator according to the faults in the field winding to protect the generator from the fault. The magnetic flux patterns in air-gap of a generator under various fault conditions as well as a normal state are simulated by using finite element method. These results are successfully applied to the detection and diagnosis of the short-circuit condition in rotor windings of a high capacitor generator.
서정일,이동준,김준환,박찬원,윤지성,김기권,이헌주 영남대학교 의과대학 1996 Yeungnam University Journal of Medicine Vol.13 No.2
Pure primary hepatic rhabdomyosarcoma in adult is very uncommon. There have been only five previous case of primary rhabdomyosarcoma of the adult liver. A case of hepatic rhabdomyosarcoma was diagnosed in a 52 year-old female. She was admitted to the hospital due to the epigastric pain and weight loss. A CT scan of the abdomen showed a large hypodense mass with focal calcification occupies most of the both lobes of the liver. The liver biopsy showed massive liver tumor composed entirely of oval shaped cells showing light microscopic and immunohistochemical evidence of rhabdomyoblastic differentiation. We report a case of hepatic rhabdomyosarcoma with review of literature.