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정대석(Daesuk Jung),박수보(Soobo Park),김민권(Minkwon Kim),오성택(Sungtaeg Oh) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In order to improve driver convenience, electronic tilt&tele column is applied a full sized car. To operate electronic tilt&tele, it needs two motors and one electronic controller. Because of high cost component parts, it’s difficult to apply to a midsize car. Meanwhile, to cope with regulations of fuel efficiency and emission, Motor driven power steering system is applied to a full sized car from a small car. But MDPS also consist of high cost component parts(motor and electronic controller). This paper proposed the MDPS Motor-driven electronic tilt&tele column system which has single motor and an integrated electronic controller and introduced the detailed design study and evaluation results.
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최창규(Chang Gyu Choi),정대석(Daesuk Jung),지규현(Kyu Hyun Ji) 한국도시행정학회 2007 도시 행정 학보 Vol.20 No.2
An officitel has many units separated which people may use as office, residential, or mixed of the both at their own discretion. Based on the building code, the building type is considered an office, not residential. During past 10 years, the number of such structure has been rapidly raised in downtown areas, and many of them have been used as residential. Using officitel as residential can lead people living to the region transformed 24hour city, but may prompt the shortage of commercial zoning where urban planning has reserved for commercial or office uses. Urban planning and design should manage the discord of the building code and real uses for achieving their goals. This study tries to understand the patterns of using offictels, because there are only rare data and studies regarding the figure and making hard to deal with officitel issues. With literature review and survey, this research show that people using officitel as residential, office, or mixed have similar demographics and satisfaction, but different using patterns in terms of the size, lodging, cooking and the distance between office and home. This study give several features regarding officitels which are very common, but rare in understanding. With shortage of related data, previous studies, and survey samples, the results is limited, and following studies are needed for suitable decision making on officitels.
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한계 선회 가속시 스티어링 복원성 원리 분석과 보상 로직 개발
이한승(Hanseung Lee),정대석(Daesuk Jung),이재길(Jaekil Lee) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
This paper describes steering returnability by analyzing forces applied to kingpin axis in limit cornering condition. The steering returnability is related to force applied to kingpin axis. These forces could be classified by its source: Tire force and Steering force. The tire force is the force generated from tire such as longitudinal, lateral, vertical force, and self-aligning torque. The steering force consists of friction force and assist force. These forces are vectorized by suspension geometry and calculated with respect to kingpin axis. The simulation results are correlated with measurement data and verifies that steering returnability is formulated by tire forces and steering forces. This study proposes new steering control logic at limit driving condition This logic is verified by simulation model to check performance and confirmed in various test conditions for robustness..
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