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등가 성능모델을 이용한 토크 컨버터의 기초 설계에 관한 연구
장욱진,임원식,이장무,Jang, Wook-Jin,Lim, Weon-Sig,Lee, Jang-Mooee 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
The torque converter, a major part of automatic transmissions, has many difficulties in analysis due to the factors such as power transmission through fluid flow, complex internal geometry, and various operating conditions. Because of such difficulties, the dynamic analysis and design of a torque converter are generally carried out by using equivalent performance model which is based on the concept of mean flow path. Since the design procedures of a torque converter are essential technology of automotive industry, the details of the procedures are rarely published. In this study, the basic design procedures of a torque converter are systemized and coded based on the equivalent performance model. The mathematical methods to deal with mean flow path determination and the core-shape are developed. And by using this model, the method of determination of performance parameters satisfying the requested performance is proposed. Finally, to embody the three-dimensional shape, the intermediate blade angles which maximize the tractive performance are determined and laid out.
[동력전달계] 토크 컨버터 성능 시험기 제작 및 성능 실험
장욱진(Wook Jin Jang),이진원(Chinwon Lee),이장무(Jang Moo Lee),임원식(Won Sik Lim),박영일(Young Il Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
The torque converter, a major part of automatic transmissions, has many difficulties in analysis due to the factors such as power transmission through fluid flow, complex internal geometry, and varying operational conditions. Because of such difficulties, the dynamic analysis and design of a torque converter are generally carried out by using equivalent performance model which is based on the concept of mean flow path. With this model many studies are carried out on the performance analysis of torque converter. And verifications of this model are performed through experiments, from which the performance characteristics of torque converter can be extracted. But many studies are restricted on normal operating conditions of torque converter such as positive speed ratio.<br/> In this study, experimental performance analysis of torque converter is carried out on various operating conditions including both negative and positive speed ratios. And the effects of varying input power and operating temperature on performance characteristics are extracted.<br/>
1차원 성능모델을 이용한 토크 컴버터의 기초 설계에 관한 연구
장욱진(Wook Jin Jang),임원식(Weon Sig Lim),이장무(Jang Moo Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
The torque converter, major part of automatic transmission, has many difficulties in analysis due to the factors such as power transmission through fluid flow, complex internal geometry, and various operating condition. Because of such difficulties, the dynamic analysis and design of a torque converter are generally carried out by using one-dimensional performance model which is based on the concept of mean flow path. The design procedures of a torque converter are essential technology of automotive industry, so the details of them are rarely published. In this study, the basic design procedures of a torque converter are systemized and coded based on the one-dimensional performance model. Firstly, the mathematical methods of mean flow path determination and the core-shape are developed. With the comparison of experimental data and sensitivity analysis results of the major design parameters such as flow angles and radii at inlet and outlet, the validity of the performance model is verified. And by using this model, the method of determination of performance parameters satisfying the requested performance is proposed. Finally, to embody the three-dimensional shape, the intermediate blade angles which maximize the tractive performance are determined and laid out.<br/>
자동변속기 변속 제어 개념 개발을 위한 회전 동역학 해석
공진형(Jinhyung Kong),장욱진(Wook Jin Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In order to improve shift quality and fuel efficiency of passenger cars with automatic transmission(A/T), the number of gear steps has been developed to increase; and we have also developed the 8-speed A/T. Since the newly developed A/T has a different arrangement of planetary gear trains or clutches, its performances should be carefully investigated at the conceptual design stage to avoid facing structural problem after completion of the conceptual or layout design. In this study, the governing equations for torsional dynamics of A/T were derived and solved to be a solution set in matrix form. With this solution set of torsional dynamics, we proposed the useful methods for developing control logic of A/T. For example, the control strategy of 4-elements shift(a.k.a. double swap shift) was proved to form a unique way; and the minimal pressure level of the clutch which maintains engagement during shift was analyzed.
Anti-proliferative Effects of β-ionone on Human Lung Cancer A-549 Cells
Sun Min Lee(이선민),Young Sook Kim(김영숙),Wook Jin Jang(장욱진),Abdur Md. Rakib(압두르 라키브),Tae Woo Oh(오태우),Boh Hyun Kim(김보현),So Young Kim(김소영),Jeong Ok Kim(김정옥),Yeong Lae Ha(하영래) 한국생명과학회 2013 생명과학회지 Vol.23 No.11
β-Ionone의 인체 비소폐암세포 A-549 cells (human non-small lung cancer A-549 cell)에 대한 anti-proliferative effect에 관한 연구를 수행하였다. A-549 cell에 다양한 농도의 β-ionone (1, 5, 10, and 15 μM)을 2, 4, 6일 간 처리 하고, 배양 2일에 A-549 cell의 생육억제와 관련되는 biochemical marker를 측정하였다. β-Ionone은 A-549 cell 생육을 dose와 time 의존적으로 저해하였다. β-Ionone 배양 2일의 IC50은 5.0 μg/ml이었다. β-Ionone은 농도 의존적으로 apoptosis를 유도하였다. β-Ionone은 p53, p21 및 Bax protein 수준을 증가시켰으나, Bcl-2 protein 발현은 억제시켰다. β-ionone은 cytosol cytochrome c 함량을 증가시켰고, caspase-9과 caspase-3 효소 활성증가를 유도하였다. 또한, β-ionone은 cPLA₂와 COX-2 protein level을 감소시켰다. 이와 같은 결과는 β-ionone의 A-549 cell에 대한 생육억제효과는 Bax와 Bcl-2 gene 발현을 reciprocal regulation하여 유도한 apoptosis와 cPLA₂ 및 COX-2 protein 발현 억제에 기인함을 의미한다. The anti-proliferative activity of β-ionone was investigated on human non-small lung cancer A-549 cells (designated A-549 cells). A-549 cells were treated with various concentrations of β-ionone (1, 5, 10, and 15 μM) for two, four, and six days. Biochemical markers related to the growth inhibition of A-549 cells by β-ionone were measured at the second day of incubation. β-Ionone inhibited the growth of A-549 cells by dose-and time-dependent manners, resulting in an IC50 of 5.0 μg/ml at the second day of incubation. β-Ionone induced apoptosis by a dose-dependent manner. β-Ionone increased levels of p53, p21, and Bax proteins, but suppressed expression of the Bcl-2 protein. Similarly, β-ionone enhanced cytochrome c release from the mitochondria to the cytosol, and induced activation of caspase-9 and -3. Additionally, β-ion-one reduced cPLA₂ and COX-2 protein levels. These results suggest that the β-ionone inhibits the proliferation of A-549 cells through reciprocal regulation of Bax and Bcl-2 gene expression and suppression of cPLA₂ and COX-2 protein expressions.