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이웅철,윤희정 대한감염학회 2009 Infection and Chemotherapy Vol.41 No.2
Actinobacillus ureae, formerly known as Pasteurella ureae, is a rare human pathogen. Twenty-eight cases of A. ureae infections in humans have been reported since its first description in 1960. Various predisposing conditions such as skull fracture, alcohol abuse, neurosurgery, schizophrenia, odontal infection, diabetes, HIV infection/AIDS, Waldenström macroglobulinemia, COPD, malnutrition, rheumatoid arthritis, HCV hepatitis, etanercept, or methotrexate have been associated with infections caused by A. ureae. We report the first case, in the medline-based literature, of A. ureae psoas muscle abscess and sepsis in a HBV carrier patient.
토션댐퍼 히스테리시스 최적화를 위한 디스크 스프링 형상에 관한 연구
이웅철(Woong-Cheol Lee),홍순석(Soon-Seok Hong),장재덕(Jae-Deok Jang),주인식(In-Sik Joo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A variety of methods are used to reduce the NVH(Noise, Vibration, Harshness) generated by powertrain system. In hybrid vehicle system, torsion damper makes the powertrain system stabilized by reducing the fluctuation torque of various engine system when the engine using. Generally, torsion damper consists of primary assembly part and secondary assembly part. And primary assembly part consists of primary cover and torsion springs, sensor wheel, etc. In addition, secondary part consists of drive plate and spline hub (directly connecting with transmission shaft). The disc spring on the inside of torsion spring is pressured to seal-washer with a constant force. By optimizing the disc spring load and shape, torsion damper will be able to be implemented various hysteresis. In this paper the new method using a disc spring is introduced to optimize the hysteresis. To analysis the hysteresis of torsion damper, numerical simulation has been carried out using ANSYS. This paper is provided useful information for disc spring design to torsion damper engineer.
동적 거동을 이용한 토크컨버터 록업 클러치 면압 분포에 관한 연구
이웅철(Woong-Cheol Lee),홍순석(Soon-Seok Hong),장재덕(Jae-Deok Jang),주인식(In-Sik Joo),배대성(Dae-Seong Bae) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The Lock-Up clutch of a torque converter directly transmits the engine power to the automatic transmission in order to achieve a more fuel economy. Friction facing, a core part lock-up clutch system, is generated high heat and facing-pressure because of the relative RPM of friction plate and engine when lock-up clutch is operated. To reduce more fuel consumption, the slip is generated between a friction facing and a front cover for torque converter lock up clutch. This paper discussed facing-pressure distribution of torque converter using the dynamic motion. To analysis the dynamic motion of friction facing, numerical simulation has been carried out using Lock-up Clutch Analysis Toolkit made by OPEN API module in DAFUL. This paper is provided torque converter engineer with useful information for lock-up clutch design.
이웅철(Woong-Chul Lee),홍순석(Soon-Seok Hong),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Torque converter in automatic transmission transfers the engine power to transmission by ATF. Hub pump drive of torque converter in automatic transmission drives oil-pump by physical connection and expands when it is highly heated and rotated. Because of interference between oil pump bush and torque converter it is important that hub pump drive’s thermal expansion rate. This paper discussed static thermal expansion rate of hub pump drive for torque converter with high temperature. The static structural model of the hub pump drive is developed by interfacing the finite element model. The static thermal expansion analysis of the hub pump drive is investigated by the impeller assembly of torque converter and modeling using ANSYS. This paper is provided torque converter engineer with useful information for optimum hub pump drive design.
토크컨버터 슬립 제어 록업 클러치 차압 불안정 요소에 관한 연구
이웅철(Woong-Chul Lee),김진문(Jin-Moon Kim),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Torque converter in automatic transmission transfers the engine power to transmission by ATF. Lock-up clutch of torque converter in automatic transmission has been recently designed with a significant purpose of achieving a more fuel economy. To reduce more fuel consumption, the slip is generated between a friction facing and a front cover for torque converter lock up clutch. This paper discussed unstable factors of differential pressure for torque converter lock-up clutch with slip control and seal ring type. Cycle time of torque converter products is delayed due to unstable of differential pressure for slip control lock-up clutch. Therefore, It is very important that the torque converter engineers search for unstable factors of differential pressure and try to find a solution.
해석 및 시험을 통한 토크 컨버터 러그 용접 강도에 관한 연구
이웅철(Woong-Chul Lee),홍순석(Soon-Seok Hong),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Torque converter in automatic transmission transfers the engine power to transmission by ATF. It is connected on engine and have to withstand against high engine torque. Generally lug on torque converter is welded on front cover and is bolted to the drive plate of engine. Because of high engine torque, welding durability of lug is important. This paper discussed welding durability of lug through the static structural analysis and test. The static structural models of the lug and welding bead are developed by interfacing the finite element model. The static structural analysis of the lug is investigated by modeling the front cover assembly using Pro-E and analyzing with ANSYS. This paper is provided torque converter engineer with useful information for durability design.
Clinical Features of Drug-induced Liver Injury According to Etiology
이병무,이웅철,장재영,안평,김진녕,정승원,박의주,이세환,김상균,차상우,김영석,조영덕,김홍수,김부성 대한의학회 2015 Journal of Korean medical science Vol.30 No.12
Drug-induced liver injury (DILI) is an increasingly common cause of acute hepatitis. We examined clinical features and types of liver injury of 65 affected patients who underwent liver biopsy according DILI etiology. The major causes of DILI were the use of herbal medications (43.2%), prescribed medications (21.6%), and traditional therapeutic preparations and dietary supplements (35%). DILI from herbal medications, traditional therapeutic preparations, and dietary supplements was associated with higher elevations in aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels than was DILI from prescription medications. The types of liver injury based on the R ratio were hepatocellular (67.7%), mixed (10.8%), and cholestatic (21.5%). Herbal medications and traditional therapeutic preparations were more commonly associated with hepatocellular liver injury than were prescription medications (P = 0.002). Herbal medications and traditional therapeutic preparations induce more hepatocellular DILI and increased elevations in AST and ALT than prescribed medications.
전백규,이웅철,장재영,정승원,김영돈,천갑진,이윤나,김상균,김영석,조영신,이세환,김홍수 대한의학회 2018 Journal of Korean medical science Vol.33 No.12
Background: Spontaneous bacterial peritonitis (SBP) is one of the severe complications of liver cirrhosis. Early detection of high-risk patients is essential for prognostic improvement. The aim of this study is to investigate the predictive factors related to in-hospital mortality in patients with SBP. Methods: This was a retrospective study of 233 SBP patients (181 males, 52 females) who were admitted to four tertiary referral hospitals between August 2002 and February 2013. The patients' laboratory and radiologic data were obtained from medical records. The Child-Turcotte-Pugh (CTP) score and model for end-stage liver disease sodium model (MELD-Na) scores were calculated using the laboratory data recorded at the time of the SBP episode. Results: The causes of liver cirrhosis were hepatitis B (44.6%), alcohol (43.8%), hepatitis C (6.0%), and cryptogenic cirrhosis (5.6%). The mean MELD-Na and CTP scores were 27.1 and 10.7, respectively. Thirty-one of the patients (13.3%) died from SBP in hospital. Multivariate analysis revealed that maximum creatinine level during treatment was a statistically significant factor for in-hospital mortality (P = 0.005). The prognostic accuracy of the maximum creatinine level during treatment was 78.0% (P < 0.001). The optimal cutoff point for the maximum serum creatinine was 2 mg/dL (P < 0.001). Conclusion: The follow-up creatinine level during treatment is an important predictive factor of in-hospital mortality in cirrhotic patients with SBP. Patients with SBP and a serum creatinine level during treatment of ≥ 2.0 mg/dL might have a high risk of in-hospital mortality.