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매크로/마이크로 레벨 볼트 결합 구조물에서의 실험적/해석적 방법을 통한 시스템 특성 비교
김봉석,이성민,이문구,이수훈,Jun Ni,송준엽,이창우,하태호 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
As the micro technology and miniaturization of a structure and component in the last couple of decades have been concretely realized, the understanding of structural and dynamic characteristics and prediction of dynamic behavior are indispensable to the miniaturized structures and micro machines. This paper shows the effect of dynamic characteristics in bolt-jointed structures by comparing natural frequencies and mode shapes between macro and micro-scale beams through experimental modal analysis and finite element analysis with a1 8 test models by materials, by size, and by joining condition; that is, SS41 and A16061-T651, micro and macro, and monolithic beam and bolt-jointed beam.
공작 기계의 신뢰성 평가를 위한 웹 기반 해석 프로그램 개발
강태한,김봉석,이수훈,송준엽,강재훈 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
Web-based analysis programs for reliability assessment of machine tools were developed in this study. First, the reliability data analysis program was developed to search for failure rate using failure data and reliability test data of mechanical part. Second, failure mode analysis was developed through performance tests like circular movement test vibration test for machine tools. This analysis program shows correlation between failure mode and performance test result. Third, tool life was predicted by correlation between flank wear and cutting time, using the extended Taylor tool life equation in turning data and the equivalently converted equation in order to apply ball endmill data to Taylor tool life equation in milling data. All the information related to input and result data can be stored in theses programs.
Polyphenol류의 항산화성 및 항돌연변이성에 관한 연구
권태영,김상엽 전주대학교 자연과학종합연구소 1997 전주대학교 자연과학연구소 학술논문집 Vol.10 No.3
Total and free phenolics contents, nitrite scavenging activity of fruits and vegetables(30 kinds) were investgated, Total content were 100-400mg% level, but the nitrite scavenging acitivity was not correlated with phenolics content. Also, 26 synthetic phenolics were investigated to relationship of chemical structure between antioxidantal activity by nitrite scavenging method, and antimutagenic capacity. Increasing of hydroxyl group number was enhanced activity, and meta substitution had highest activity than ortho- or para substituents.
이수훈,김봉석,강태한,송준엽,강재훈,서천석 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
This paper deals with a prediction method of tool life in view of the reliability assessment. In this study, the flank wear was studied among multi-factors deciding the tool wear state. Firstly, tool life was predicted by correlation between flank wear and cutting time, based on the extended Taylor tool life equation of turning data, including parameters of cutting speed, feed rate, and cutting depth. Secondly, each of cutting conditions of endmilling was equivalently converted to apply ball endmill data to the extended Taylor equation. The web-based reliability prediction program for tool life is being developed as one of reliability assessment programs to for the machine tools.
대구지하철화재 현장 수습체계 분석을 통한 신도시 재난대응체제 구축에 관한 연구
홍원화,김태현,전규엽 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10
The disaster was breaking out at JungAnglo station in Daegu It might be ended as a typical fire happening but proceeded to the disaster because of the inappropriate system of disaster prevention we had taken, the lack of understanding and specialization about Even though many cities have been studied about disaster prevention The synthesis operation and management of disaster prevention we used before have not been prevention system Thus investigating and analyzing document about international and domestic urban fire and disaster system keep us, being in force and studying at present We try to get the point and search the system of advanced nation Up to now, the conditions of damage from disasters and accidents in Korea are getting disaster system We compare to system of disaster Japan, American and Korean This is the introduce abstract of fire disaster at Daegu subway and Sampoong department store This study of analyze of the Timetable and system for settlement resulted from disasters too And we setup new disaster confrontation system
이수훈,김봉석,홍민성,김종민,JUN NI,박상호,송준엽,이창우,하태호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
This paper presents virtual machining system in order to realize turning process in virtual space. A reliable virtual turning process simulation was developed based on the surface shaping system which is capable of considering geometric model, thermal error model, and vibration model. Accuracy of surface shape resulting from proposed machining simulator was verified experimentally. This paper also developed the watchdog agent that continuously assessed, diagnosed, and predicted performance of products and machines in machining. The Watchdog agent extracted feature signal using time-frequency analysis among various signals from multi-sensor and evaluated machining condition using performance confidence value.
( Tae Yeob Kim ),( Joo Hyun Sohn ),( Soon Ho Um ),( Yeon Seok Seo ),( Soon Koo Baik ),( Moon Young Kim ),( Jae Young Jang ),( Soung Won Jeong ),( Young Seok Kim ),( Sang Gyune Kim ),( Dong Joon Kim ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: Carvedilol, a potent non-cardioselective beta blocker with vasodilating properties due to alpha-1 blockade, is more effective in reducing portal pressure than propranolol in randomized controlled hemodynamic studies. Recently, longterm low dose of carvedilol may be suggested an option for primary prophylaxis in patients with high-risk esophageal varices. The aim of this study is to evaluate long-term effect of carvediolol versus propranolol on reduction in portal pressure in patients with cirrhosis. Methods: We conducted this ongoing prospective randomized multicenter study (target sample size: 130 patients) between July 2011 and February 2013 and analyzed clinical and hemodynamic measurement data of 99 cirrhotic patients with severe portal hypertension (HVPG > 12 mmHg). During that period, these patients were randomized to either carvedilol (mean dose 11.6±2.2 mg/day in 50 patients) or propranolol group (mean dose 153.5±100.2 mg/day in 49 patients). After randomization, 8 patients and 11 patients were dropped out in carvedilol and propranolol group, respectively. The responders were defined to achieve a fall in HVPG to < 12 mmHg or a 20% reduction from baseline values 6weeks after treatment. Results: There were no significant differences between carvedilol and propranolol group in age, sex, etiology, Child-Turcott- Pugh score, MELD score, severity of HVPG, presence of ascites and baseline serum parameters. In per-protocol analysis, the rate of responder of patients with receiving carvedilol was 54.8% (23/42) as compared with 45.2% (16/38) of those with receiving propranolol (P=0.258). In intent-to-treat analysis, the rate of responder between carvedilol and propranolol group were 46.0% and 32.7%, respectively (P=0.174). The mean decrease of HVPG was 15.6±18.1% and 8.1±30.1%, respectively (P=0.188). Finally, there was no significant difference in adverse events between two groups. Conclusions: In this interim analysis, low dose of carvedilol showed similar effi cacy in reducing portal pressure compared to propranolol in cirrhotic patients with severe portal hypertension.
초기 간세포암종을 동반한 간경변증 환자에서 생존 예측에 있어서의 간정맥압력차와 연관인자
김태엽 ( Tae Yeob Kim ),김문영 ( Moon Young Kim ),장재영 ( Jae Young Jang ),석기태 ( Ki Tae Suk ),정승원 ( Soung Won Jeong ),김동준 ( Dong Joon Kim ),손주현 ( Joo Hyun Sohn ),백순구 ( Soon Koo Baik ) 대한간암학회 2014 대한간암학회지 Vol.14 No.1
Background/Aims: To analyze the usefulness of hepatic venous pressure gradient (HVPG) in survival prediction in cirrhotic patients with early and very early hepatocellular carcinoma (HCC). Methods: We consecutively collected data of 45 stable cirrhotic patients (male 41, median age 57.2 years, BCLC A 29) with early-stage HCC undergoing HVPG measurement. Prognostic accuracy of HVPG was analyzed by the area under curve (AUC). Survival curves and the associated factors of HVPG status were obtained using Kaplan-Meier method and logistic regression analysis, respectively. Results: The AUC value for prediction of survival by HVPG were 0.754 (95% CI, 0.603-0.870, P=0.006). The cut-off value of HVPG to predict death was 12 mmHg. Among the 45 patients, 11 patients (24.4%) died: 11 of 28 patients in the high HVPG group and none of 17 patients in the low HVPG group during followup period (P=0.003). The survival rate with high HVPG group was higher than those of low HVPG group (log rank P=0.008). In Child-Turcott-Pugh (CTP) class, the survival rate with CTP A class was higher than that with CTP B class (log rank P<0.001). The only associated factor with HVPG ≥12 mmHg in CTP A class and early-stage HCC was the presence of medium or large sized esophageal varices (odds ratio 66.8, 95% CI, 1.3-3530.4, P=0.038). Conclusions: HVPG ≥12 mmHg may be suggested a predictor of survival in cirrhotic patients with early-stage HCC. In CTP A class, the presence of medium or large sized esophageal varices were associated with high HVPG.