1. Estimation of rack force and road roughness based on steering system Hee-Beom Lee, Kwang-Suk Han, Young-Kyu Park, Gi-Woo Kim 2. µðÁöÅаøÀ¯´ëÇÐ(¹Ì·¡ÇüÀÚµ¿Â÷) ¼º°ú °øÀ¯È¸ Âü¼®