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장현익,용부중,조성우,최인성,민경찬,김규현,Jang, Hyunik,Yong, Boojoong,Cho, Seongwoo,Choi, Inseong,Min, Kyongchan,Kim, Gyuhyun 한국자동차안전학회 2012 자동차안전학회지 Vol.4 No.1
ADAS(Advanced Driver Assistance System) which is developed for alleviating driver's load has become improved with extending it's role. Previously, ADAS offered simple function just to make driver's convenience. However, nowadays ADAS also acts as Active Safety system which is made to release and/or prevent accidents. Longitudinal control system, as one of major parts of Active Safety System, is assessed as doing direct effect on avoiding accidents. Therefore, many countries such as Europe and America has pushed longitudinal control system as a government-wide project. In this paper, it covers the result of evaluation system and vehicle evaluation for development study in FCW, ACC and AEB.
반도체 DEVICE 안착을 위한 마찰력 및 정지 마찰 계수 도출
장현익(Hyun Ik Jang),류충렬(Choong Ryul Ryou) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
In the semiconductor inspection process, device seating defects arise from factors like device miniaturization and cumulative unit tolerance. Seating defects lead to critical secondary issues, including product loss and equipment damage. As a solution to address this, the utilization of vibrators is being highlighted. However, using a vibrator means applying an additional external force, thus requiring the minimum necessary force. Therefore, this paper proposes a method to derive the minimum external force that a vibrator should apply using only product information. This method involves mathematical modeling and experimental approaches to determine the maximum static frictional force and the static friction coefficient. The research results showed that the maximum static frictional force and the static friction coefficient for the X and Y axes of each product had a deviation of up to 0.4mN and 0.04, respectively. This study can help calculate the vibration acceleration of the vibrator for each mass product, and can consider solving the seating problems in inspection process of next-generation devices.