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대장암세포주 HT-29에서 Peroxisome Proliferator-activated Receptor-γ 리간드가 Fas 매개 세포자멸사에 미치는 영향
정용우 ( Chung Yong Woo ),한동수 ( Han Dong Soo ),강은경 ( Kang Eun Kyung ),이진숙 ( Lee Jin Sook ),이항락 ( Lee Hang Rak ),김진배 ( Kim Jin Bae ),박준용 ( Park Jun Yong ),김용석 ( Kim Yong Seok ),이오영 ( Lee Oh Young ),손주현 ( 대한소화기학회 2003 대한소화기학회지 Vol.42 No.1
Background/Aims: Peroxisome proliferator-activated receptor-γ (PPAR-γ) plays a critical role in adipocytes differentiation and insulin sensitivity and is also related to regulation of inflammation and cell proliferation. The aim of this study was to investigate the PPAR-γ agonist-induced apoptosis and effects of PPAR-γ agonist on Fas-mediated apoptosis in a human colon cancer cell line. Methods: Cell survival and apoptosis of HT-29 cells were measured by trypan blue exclusion method and FACScan after treatment with 15d-PGJ2, ciglitazone and IgM anti-Fas antibody (CH11), respectively or simultaneously. Also, activation of caspase-3 and caspase-8 was analyzed to assess the effects of PPAR-γ and Fas on apoptosis signaling pathways. Results: CH11 induced apoptosis of HT-29 cells. 15d-PGJ2 or ciglitazone alone did not induce apoptosis, but combined stimulation with CH11 synergistically induced apoptosis. Also, 15d-PGJ2 alone did not activate caspase-3, but CH11 and 15d-PGJ2 synergistically activated caspase-3. CH11 activated procaspase-8, but 15d-PGJ2 did not. Conclusions: PPAR-γwas not an enough condition to induce apoptosis of HT-29 cells. Apoptosis was induced by high dose Fas, and was enhanced with PPAR-γ agonist. PPAR-γ agonist seems to enhance Fas-mediated apoptosis by affecting the way between caspase-8 and caspase-3. Further research is needed to use PPAR-γ agonists as chemopreventive and therapeutic agent for colon cancer and to find the pathways of PPAR-γ on apoptotic cascade of colon cancer cells. (Korean J Gastroenterol 2003;42:35-41)
정용우(Yong Woo Jeong),정정주(Chung Choo Chung),김원희(Won Hee Kim) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
In this paper, we present a hybrid impedance control for smoothly and easily taking over the steering wheel from the autonomous driving system as well as to for the steering angle tracking control in the rack-mounted MDPS (R-MDPS). The proposed method consists of an impedance control for taking over and a sliding mode control for steering angle tracking. With the driver’s torque, the proposed method is activated as the impedance controller. The desired impedance transfer function from the driver’s torque to the steering angle is designed to reflect the driver’s torque to the steering control. Then, the desired impedance steering angle is derived for the desired impedance. If the unintended driver’s torque is small, the effect of the driver’s torque to the steering angle is also small by the designed impedance. If the intended driver’s torque for steering control is relatively large, the driver’s torque can be reflected to the steering control by the designed impedance. Without the driver’s torque, the proposed method is activated as the steering angle tracking controller for the autonomous driving. The sliding mode control method is designed based on the super twisting algorithm for the steering angle tracking control.
차량 거동 상태를 고려한 차량위치 측위 필터링 및 자동주차 시스템
정용우(Yong Woo Jeong),최우영(Woo Young Choi),정정주(Chung Choo Chung) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
최근 자율주행 시스템에 대한 수요가 증가하며, 운전 미숙자 및 주자 편의를 위한 자동주차 시스템에 대한 수요가 늘어나고 있다. 자동주차를 위해서는 자 차량과 주차하고자 하는 구역 사이의 상대거리를 측위 해야 한다. 이에 대한 측위를 위해, 전 방향 카메라를 통한 상대거리 측위 기술 개발이 진행되어 왔지만, 주차영역 검출 알고리즘의 민감도에 따라, 거리측정 결과(상대 위치 및 heading angle)의 떨림을 유발한다. 해당 결과는 주차경로 생성 알고리즘 및 차량 제어에 영향을 끼치기에, 이에 대한 개선이 필요하다, 본 연구에서는 카메라 측위 결과의 비정상적인 떨림을 제거하고자, 차량의 거동상태를 고려한 필터링 기법 및 이를 활용한 직각/평행 주차의 실차 실험 결과를 제시한다.
협소 주차 공간에서의 N-Circles 경로 생성 기법
정용우(Yong Woo Jeong),김진성(Jinsung Kim),정정주(Chung Choo Chung) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
This paper proposes a new and practical local path planning for a perpendicular parking scenario in a narrow parking space. In this paper, we introduce N-Circle Path Planning in Narrow Parking Space, which guarantees simple and has low computation time. We perform the path planning algorithm by generating circles and lines, which guarantees the collision avoidance conditions with the surrounding obstacles. We established safe parking conditions for collision avoidance maneuvers by formulating the parking spaces as constraints using the vehicle’s forward circle motion and backward circle motion. Then, we introduce a generalized optimization problem to solve perpendicular parking. The proposed path planning method was validated and analyzed with several parking scenarios. The effectiveness of the proposed system is conducted with MALAB/Simulink.