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손창우,장성희,장영주,서태일,Son, Chang-Woo,Jang, Sung-Hui,Jang, Young-Ju,Seo, Tae-Il 한국금형공학회 2015 한국금형공학회지 Vol.9 No.1
Recently, life expectancy increased in the development of medicine, the need for health has increased. Market for medical equipment is growing rapidly to an increase in the interest in health and aging worldwide. It is a device intended for ultra sensitive cleavage process of bone during joint replacement surgery on a technical advanced surgery, finishing, and hole. Domestic demand of the hand piece is a necessary condition on an ongoing basis. However, hand piece was made on the basis of the experience of many years in the country Japan, Germany, and the United States has spread to more than 90% domestic market. Feel the need for the development of the hand piece in the country, many companies are trying to in-house production hand piece. In an attempt to solve the problems with the hand piece of the present, in this paper, it was supposed to be a study of rechargeable hand piece to replace the existing pneumatic.
MPC-BASED STEERING CONTROL FOR BACKWARD-DRIVING VEHICLE USING STEREO VISION
손창우,최원식,안창선 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.5
We propose a steering control algorithm for autonomous backward driving in a narrow corridor. Passable spaces are detected using a stereo camera, and the steering angle is controlled by a model predictive controller (MPC). For passable space detection, an UV-disparity map is calculated from the original disparity map. Information regarding passable spaces collected by the stereo camera is used in steering control. Backward driving requires the driver’s preemptive actions, which can be learned by experience because of the non-intuitive responses (the initial motion of the vehicle is opposite to the driver’s steering angle input). This occurs because a backward-driving vehicle is a non-minimum phase system. One of the most popular steering control algorithms is Stanley method, which is based on the feedback of lateral displacement error and heading angle error. The method is very intuitive and works well for forward driving, but it exhibits significant undershoot for backward driving cases. Furthermore, the method does not explicitly consider any constraints on control inputs and states. We designed a steering controller based on the MPC technique that requires future information but can handle constraints explicitly. Because we have near-future information from the stereo camera under limited passable spaces, MPC can be effectively implemented. We performed several simulations and experiments to show the performance and superiority of the suggested method over a simple feedback-based control algorithm.
당뇨병 환자의 사회경제적 수준과 안질환 및 신장질환 합병증 검사와의 관계
손창우,황종남 한국보건교육건강증진학회 2023 보건교육건강증진학회지 Vol.40 No.5
Objectives: This study aimed to explore the relationship between socioeconomic status (SES) and utilization of diabetic eye and kidney screening services to suggest policy interventions for preventing and managing diabetic retinopathy and diabetic nephropathy. Methods: For the analyses, 24,674 residents over 30 years old who self-reported having diabetes in the Community Health Survey 2020 were included in the final analytic models. Individuals self-reported utilization of diabetic complication screening was used to examine the impacts of SES on the utilization of diabetic eye and kidney screening services. Results: The results indicated that individuals with a high education level of high school diploma were more likely to receive eye and kidney complication screenings. For eye complication screening OR: 1.35, 95% CI: 1.26-1.44; OR: 1.54, 95%CI: 1.41-1.69; for kidney complication screening OR: 1.29, 95% CI: 1.20-1.38; OR: 1.46, 95% CI: 1.33-1.59. Furthermore, those in Q5 household income showed a greater likelihood of using diabetic complication screenings. For eye complication screening, OR: 1.29, 95% CI: 1.15-1.45; for kidney complication screening, OR: 1.28, 95% CI: 1.14-1.43. Conclusions: There is a need to consider implementing health promotion policies addressing disparities in diabetic complication screenings, regardless of an individual’s SES and physical environment in their community. This could contribute to mitigating the gaps in the management of diabetic complications for individuals with diabetes.
GIS 공간분석을 활용한 도시거주자 비만에 영향을 미치는 신체활동 및 식품 환경 연구
손창우,윤난희 알코올과 건강행동학회 2021 알코올과 건강행동연구 Vol.22 No.1
Objectives: As the obesity rate has been increasing in Seoul, it is emphasized to make efforts for obesity prevention and management. The purpose of this study is to examine the effect of built environmental factors affecting the physical activity and dietary behaviors on obesity among the population in Seoul using GIS spatial analysis. Methods: GIS spatial analysis was conducted to identify the influence of built environmental factors affecting physical activity and dietary behaviors, and socioeconomic environmental factors on obesity. The data of 92,357 Seoul residents and their living environment were obtained from multiple sources and used. Results: After controlling age, sex, residential type, and officially assessed land and housing price of the study population, those who lived far from the subway station were more likely to be obese. Those who lived in the community with higher intersection density or lower steepness of the slope were more likely to be obese. In terms of the food environment, a significantly positive relationship was found between higher access to the high-calorie food and obesity. Conclusions: In order to effectively prevent and manage obesity, it is necessary to make a supportive environment to facilitate people’s healthy behaviors through multidisciplinary and multi-sectoral efforts.