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H2-M3의 세포 표면 발현이 NK 세포의 활성에 미치는 영향 분석
이상열,전태훈,Lee, Sang-Yeol,Chun, Tae-Hoon 대한약학회 2009 약학회지 Vol.53 No.3
H2-M3 (M3) is a unique antigen presenting molecule which provides N-formylated peptide to certain type of T cells. Previous observation indicated that NK cell activity is significantly diminished during listerial infection in $H2-M3^{-/-}$ mice. To explore the possibility that M3 expression directly effect on NK cell activity, we measured NK cell activity with or without stimulation of N-formylated peptide on antigen presenting cells. Results indicated that the expression of M3 is not directly influence on NK cell activity. Further study will be focused on the indirect effect of M3 on regulating NK cell activity.
이상열,Yongjoo Lee,Youngbok Lee,Seunghyup Shin,김민재,박지환,민경덕 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4
The process used by engine manufacturers for the development of a new engine includes the planning and conceptual design phases, followed by the detailed design phase, in which the design target specifications are met. In the conceptual design phase, a rough specification of the target engine is presented to facilitate a detailed design and the additional cost of modification is reduced exponentially. In the conceptual design phase, however, not only is there no real engine. but there are also no 1D and 3D models present, so it is impossible to test and simulate them. Therefore, at this stage, a model that can predict emission and performance only according to the specifications and operating conditions of the engine would be very useful. Previous studies developed an EGR prediction model that can be used in the 0-D NOx prediction using a deep learning method. In this study, a NOx prediction model with high accuracy using only the operating conditions as input variables, without ECU data, was developed using deep neural networks. The developed model has high accuracy with an R-square of 0.988. The feature of this model is that all the input parameters for the deep neural network come from the operating conditions of the engine. Therefore, this model can be used in the early stages of the development of new engines when testing and simulation cannot be performed because they do not exist. The designer can set the range of the operating conditions such that they do not exceed the NOx limits at the specific operating point (specific rpm and BMEP). This variable operating design methodology is expected to be useful in the development of new engines for automobile manufacturers with various engine data.
비등방성 복합 적층판의 임계좌굴하중 및 모드의 수치 해석
이상열,임성순,장석윤,Lee, Sang Youl,Yhim, Sung Soon,Chang, Suk Yoon 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.3
1차전단변형 판이론에 의한 비등방성 복합적층판의 임계좌굴하중 및 좌굴모드는 기존의 해석적인 방법으로는 다양한 조건에 대하여 해를 제공할 수 없다는 단점을 가지고 있다. 따라서 근사해법인 수치해석을 이용하게 되는데, 이러한 수치해석기법으로 기존 상용프로그램에서는 유한요소법이 널리 사용되었다. 그러나 least upper bound 특성을 가지고 있는 유한요소법을 이용한 적층판의 좌굴해는 구조적인 안정성을 보장하지 못하는 경우도 있다. 따라서 본 논문에서는 유한차분법에 의한 좌굴해석을 수행하여 유한요소법과 상호 비교함으로서 각 경우에 관한 두 가지 수치해석기법의 장단점을 규명하고 효과적으로 적용할 수 있는 기법을 제시하는 것을 목적으로 하였다. 수치해석 결과, 유한차분법에 의한 좌굴하중 및 좌굴모드는 신소재를 사용하는 적층 구조물의 실용화에 앞서 다양한 기준을 제시할 수 있을 것으로 판단된다. The solution of anisotropic plate via the classical methods is limited to relatively load and boundary conditions. If these conditions are more complex, the analysis becomes increasingly tedious and even impossible. For many plate problems of considerable practical interest, analytic solutions to the governing differential equations cannot be found. Among the numerical techniques presently available, the finite difference method and the finite element method are powerful numerical methods. The objective of this paper is to compare with each numerical methods for the buckling load and modes of anisotropic composite laminated plates considering shear deformation. In applying numerical methods to solve differential equations of anisotropic plates, this study uses the finite difference method and the finite element method. In determining the eigenvalue by Finite Difference Method, this paper represent good convergence compared with Finite Element Method. Several numerical examples and buckling modes show the effectiveness of various numerical methods and they will give a guides in deciding minimum buckling load and various mode shapes.
가상현실 게임을 이용한 4주간 훈련이 노인의 균형 및 보행 능력과 우울증에 미치는 효과
이상열,이수경,김용훈,채정병,Lee, Sang-Yeol,Lee, Su-Kyung,Kim, Young-Hoon,Chae, Jung-Byung 대한고유수용성신경근촉진법학회 2012 PNF and Movement Vol.10 No.2
Purpose : This study investigated the effect of 4 weeks training of virtual reality game on balance and gait ability, depression of elderly people. Methods : The subjects of this study were 12 elderly people over 65 age. The subjects were treated by training using virtual reality gam (during 60 minutes, 3 times a week for 4 weeks). The results of the experiment were analyzed using paired T-test along with averages and standard deviations as the statistical methods for data analyses. Results : In comparison of depression, gait and balance ability between pre-test and post-test, there were statistically significant differences. Conclusion : Our study finding indicate that training using virtual reality game could improve balance and gait ability, depression in elderly people. According to our study, training using virtual reality game is judged to be used for elderly people with gait and balance problems, depression to prevent fall down.
The Effects The Type of Canes-Handle Affects in Recovering-Balance of Hemiplegic patients
이상열,이명희,박민철,한진태,권오현,배성수,Lee, Sang-Yeol,Lee, Myoung-Hee,Park, Min-Chull,Han, Jin-Tae,Kweon, Oh-Hyun,Bae, Sung-Soo The Korean Society of Physical Therapy 2008 대한물리치료학회지 Vol.20 No.4
Purpose: We compared T-type and I-type canes on postural balance in 28 hemiplegic patients. Methods: Subjects were allocated randomly into two groups: a T-shape cane group (n=14) and an I-shape cane group (n=14). Before the test, subjects were trained by a physical therapist to walk with a cane for 6 weeks. The Main Outcome Measures were measured as maximal sway velocity, sway path, sway area, and partial weight bearing using a Balance Performance Monitor (BPM) and ambulation velocity using a 'Timed up and go test'. We also measured the maximal ambulation velocity. Results: The distribution of weight bearing on the affected side without the cane was 35% in the I-shape cane group and 36% in the T-shape cane group. After training, weight bearing on the affected side increased by 45% in the I-shape cane group and 40% in the T-shape cane group. With the cane held in the hand, weight bearing on the affected side in the T-shape cane group decreased by 3%. Conclusion: The I-shaped cane increased static standing balance, including hemiplegic side weight bearing. Therefore, I-shape canes can improve the balance of hemiplegic patients.