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안병민,홍동표,Ahn, Byoung-Min,Hong, Dong-Pyo 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2
Automobile company tries to reduce the inertia of powertrain to increase the fuel efficiency and increase the engine power every year to make the high speed driving possible at full load condition. These cause the torsional vibration of powertrain. But the demand about ride comfort improvement is increased constantly, so torsional vibration of powertrain become an emergency problem to be cured. This study is a basic research to reduce the torsional vibration of powertrain at driving condition. First, the heavy duty powertrain is characterized as a vibrating system. Its natural frequencies and mode shapes are reviewed. Second, by comparison of simulation results and experiment results, validity of developed model is verified. Finally, the couterplan which can reduce the torsional vibration by mode analysis and parameter modification is suggested.
안병민,장일도,홍동표,Ahn, Byoung-Min,Chang, Il-Do,Hong, Dong-Pyo 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.4
The main torsional vibration source of the powertrain is the fluctuation of engine torque. The gear rattle is impact generating in the backlash of the free gear due to this torsional vibration. Optimization of the clutch torsional characteristic is one of the effective method to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the detailed clutch modeling and the experiment. This paper pays attention to the optimization of clutch design parameters and the experiment to reduce the idle gear rattle vibration and noise.
광범위한 간문맥전이와 세동전이로 인해 간손상이 초래된 위암 - 비전형적인 방사선학적 소견과 병리조직소견
안병민(Byung Min Ahn),이봉수(Bong Soo Lee),송하헌(Ha Hyn Song),이혜경(Hye Kyung Lee),박찬욱(Chan Wook Park),김현(Hyun Kim) 대한소화기학회 1997 대한소화기학회지 Vol.30 No.6
In contrast to the primary hepatocellular carcinoma, tumor thrombosis of the portal vein is rarely found in metastatic liver cancer which is frequently found in the patients with primary cancers of organs that has portal venous drainage. We recently experienced a case of hepatic metastasis of gastric carcinoma showing unusual radiological findings in a 67-year-old woman. She complained of abdominal bloating during the second phase of combined chemotherapy. Four months ago she had received pylorus preserving gastrectomy for advanced gastric cancer. The liver CT showed raiher well marginated, geographic low attenuations distrubuted along periphery of liver and thrombosis of the main portal vein. After infusion of contrast media, the major part of peripheral low attenuation became isodense to the central portion of liver. Ultrasound guided multifocal biopses revealed massive portal venous tumor thrombosis and trans-sinusoidal metastasis of gastric carcinoma which was more severe in the areas of peripheral low echogenicity where hepatic necrosis and fibrosis were observed. In conclusion, geographic attenuation difference in the liver on cross sectional images can be induced by massive portal venous thrombosis and following hepatic injury in liver metastasis from gastric carcinoma. (Korean J Gastroenterol 1997; 30:831-836)
원발성 간암 환자에 대한 경도관간동맥화학색전술과 병용한 전신적 FAM 화학요법의 치료 효과 - 자연경과군 및 전신적 FAM 화학요법군과의 비교 -
안병민(Byung Min Ahn),김부성(Boo Sung Kim),정규원(Kyu Won Chung),선희식(Hee Sik Sun),양진모(Jin Mo Yang),양시영(Si Young Yang),이상헌(Sang Heon Lee),최명규(Myung Gyu Choi),최상욱(Sang Wook Choi),백남종(Nam Jong Baeg),심규식(Kyu Sik S 대한내과학회 1991 대한내과학회지 Vol.41 No.1
N/A Hepatocellular carcinoma (HCC) is considered to be a highly malignant tumor with a poor prognosis. It is usually not resectable and there is no other definite treatment. Transcatheter arterial chemoembolization (TAE), now become one of the established treatments for hepatocellular carcinoma. We compared the therapeutic effects of TAE with systemic FAM chemotherapy with those of conservative treatment and systemic FAM chemotherapy alone in patients with large primary HCC during the last 3 years, retrospectively, in relation to prognostic factors, response rate, and survival time. In a total of 71 patients with large primary HCC and clinical status of Child grading A or B, 25 patients wen treated conservatively (Group A), 21 patients with systemic FAM chemotherapy alone (Group B), and 28 patients with TAE combined with systemic FAM chemotherapy (Group C). The results were as follows: 1) There was no complete response in any group. Partial response was archieved in only 2 patients (7%) in Group C. No change was observed in 5 patients (24%) in Group B and 13 patients (46%) in Group B and 13 patients (46%) in Group C. Otherwise, the rest of them made progress. 2) The survival rates at the end of the third and sixth months were 64% and 16% in Group A, 76%; and 24% in Group B, and 100% and 86% in Group C, respectively. 3) The average survival times of patients were 4.7 months in Group A and 5.8 months in Group B, which were not significantly different from those of Group A, and 13.1 months in Group C (p=0.001). The results suggest that the combined modality of TAE with systemic FAM chemotherapy is an effective palliative treatment that prolongs survival of patients with large primary HCC.
안병민(B.M.Ahn),최하철(H.C.Choi),최은오(E.O.Choi),홍동표(D.P.Hong),정태진(T.J.Chung) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In recent year. As the demand about low vibration and noise vehicle is increased constantly. Automobile companies try to a lot of thing to achieve this demand. Gear rattle vibration became a emergency problem to be cured at idling.<br/> There are two kinds method to reduce idle gear rattle vibration. One is optimization of clutch damper design para meted stiffness. hysteresis torque. preload). the other is system parameter modification (inertia. drag torque, backlash). But these methods are impossible to estimate influence rate of each gearpair Con the idle gear rattle vibration.<br/> In this study. 14 degrees of freedom nonlinear model is developed to analysis influence rate of each gearpair on the idle gear rattle vibration and the counterplan to design low vibration transmission is suggested.
안병민(B.M.Ahn),최은오(E.O.Choi),홍동표(D.P.Hong),정태진(T.J.Chung) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
Automobile company tries to reduce the inertia of powertrain to increase the fuel efficiency and increase the engine power every year to make the high speed driving possible at f'-Ill load condition. These cause the torsional vibration of powertrain. But the demand about ride comfort improvement increased constantly. so torsional vibration of powertrain became a emergency problem to be cured.<br/> This study is a basic research to reduce the torsional vibration of powertrain at driving condition. First. the heavy duty powertrain is characterized as a vibrating system. Its natural frequencies and mode shapes are reviewed. Second. By comparison of simulation results and experiment results. propriety of developed model is verified. Finally. the counterplan which can reduce the torsional vibration by mode analysis and parameter modification is suggested.