Kyu-Jin Lee

Development of Wheel-Terrain Interaction Device for Mobility Prediction of Off-road Vehicle

Received 29 September 2014; received in revised 3 November 2014; accepted 4 November 2014ABSTRACT This paper presents on the development of wheel-terrain interaction device using low-pricedsensors, which will be used to predict the drawbar pull and optimal slip of off-road vehicle inreal time. The essential variables obtained in the device to predict the mobility of vehicles aredetermined based on semi-empirical model describing the wheel-terrain interaction. Using thedeveloped device, the experiments about the wheel-terrain interaction were performed on thesoil of the Jumunjin standard sand, which yielded dynamic weight, motor driving torque, draw-bar pull, and sinkage with respect to wheel slip ratio. Finally, the repeatability of the measureddata are verified through repeating the experiments three times on the same condition.Key Words: Drawbar pull, Off-road vehicle, Wheel-terrain interaction device

Compact high power Raman laser system using phase-modulated sidebands amplified by a single tapered amplifier

We propose a compact Raman laser system for atom interferometry useful for inertial sensors. Two phaselocked coherent lights are obtained by electro-optic phase modulation of light from a single diode laser. The carrier is suppressed by tuning an external Fabry-Perot cavity that only the sidebands pass through. Furthermore, a single tapered amplifier is used to amplify the two sidebands simultaneously.