http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Younghwan Son,Chang-Ki Baek,In-Shik Han,Han-Soo Joo,Tae-Gyu Goo,Ooksang Yoo,Wonho Choi,Hee-Hwan Ji,Hi-Deok Lee,Kim, D.M. IEEE 2009 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.8 No.5
<P>This paper presents the depth profile of oxide trap density, extracted from the dual gate processed thermally grown oxide in NO ambient and remote plasma nitrided oxides by using multifrequency and multitemperature charge pumping technique in conjunction with the tunneling model of trapped charges. Nitrided oxide is widely used to improve the reliability of nanoscale MOSFETs because it can decrease the degradation of gate oxide due to the generation of traps therein. Based on the measurement, the optimum nitrogen concentration in such typical nitrided process is discussed in correlation with the gate oxide thickness for nanoscale CMOSFETs.</P>
Optimal Design of Body Profile for Stable Stair Climbing Via Tri-wheels
Younghwan Kim,Donghan Son,Jeongpil Shin,TaeWon Seo 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.12
In this paper, we propose a mobile robot platform that is an improved form of LEVO. The LEVO uses a regular wheel and curved spoke triwheel(CSTW) system to drive flat terrain and stair climbs. However, this robot has problems when climbing stairs: it’s bottom profile collides with the stairs, resulting in huge jerk. To solve this problem, in this study, attempts to reduce the jerk value by applying a blade using a B-spline to the bottom profiles where the robot collides with the stairs. At this time, by reducing jerk, it can contribute to extending the life of the robot and improving driving stability. This study involved two steps. First, simulation was performed by adjusting the number and position of control points of the curve (B-spline). In this process, the orthogonal arrangement was applied among the optimal design techniques to finally reduce the jerk value by 92% and the driving torque needed to climb the stairs by 9.5%. At this time B-spline has one control point and the position is (300, 15). This simulation result was verified experimentally using a test bench and a prototype robot. As a result, it was confirmed that the jerk was reduced by 66.7%. Simulations and experimental verification based on them have shown that the proposed method is sufficiently effective in real environment.