Joo Hwa Hong

Feed drive system of machine tools may experience serious vibrations or unstable motions during high-speed operation. In this paper, a 6 D.O.F (Degree-Of-Freedom) lumped parameter model was proposed in order to analyze vibrations of a ball screw feed-drive system, which takes planar motion. The equations of motion were derived for the proposed model. Natural frequencies of the system and transient responses due to driving motor speed control input were also analyzed. Experimental modal analysis

Unmanned aerial vehicles (UAVs) are now very popular for many applications such as surveillance and transport and they are typically constructed starting from the design process. However, it is very time consuming and require all new airworthiness process. In this paper, we aim to provide a novel framework to automate an existing aircraft for unmanned operations using a humanoid robot, which is capable of manipulating the yoke, levers, switches and pedals to fly the airplane while operating vari

Abstract This paper presents the hardware and software of our team's EurecarBot for Challenge 2 in the 2017 Mohamed Bin Zayed International Robotics Challenge (MBZIRC). Fully automating our robots actions in a real environment required many component technologies for manipulation and vision processing. To perform the complex robotic missions, we developed a task execution framework, which provides a high‐level interface to specify the given tasks. In this study, we focus on the valve operation p

Multilayered coatings of WC-Ti and WC-Ti1-xAlxN were deposited to form a wear- and corrosion-resistant surface. The cathodic arc deposition (CAD) method was used to deposit WC-Ti1- xAlxN coatings with variable Al content onto high speed steel (HSS). Three kinds of WC-Ti1-xAlxN coatings, each with and without interlayer (Ti/TiN), were prepared. The corrosion behaviors of WCTi1- xAlxN coatings in a deaerated 3.5% NaCl solution were investigated by galvanic corrosion test and potentiodynamic polari

The first Advanced Light Water Reactor called Advanced Power Reactor (APR1400) has many specific features such as passive safety features, digital I and C, and digitalized main control room design. This digital-based neo-concept main control room design needs comprehensive verification and validation process to get the license for construction. An integrated system for APR1400 MMIS design validation is under development by KEPRI with the participating of KHNP. The facility which is based on the