J.-H. Lee

Learn More
Recently, ammonia-thermal reaction has been used for molecular intercalation in layered FeSe, resulting a new Lix(NH3)yFe2Se2 superconductor with Tc ~ 45 K. Here, we have used temperature dependent extended x-ray absorption fine structure (EXAFS) to investigate local atomic displacements in single crystals of this new superconductor. Using polarized EXAFS(More)
This paper describes the development of metallic bipolar plate fabrication using micro-electroforming process for mini-DMFC (direct methanol fuel cell) stacks. Ultraviolet (UV) lithography was used to define micro-fluidic channels using a photomask and exposure process. Micro-fluidic channels mold with 300 μm thick and 500 μm wide were firstly fabricated in(More)
In this paper, we propose a sliding mode tracking control for robot manipulators using a disturbance observer , to eliminate the chattering problem existed i n conventional sliding mode control under modeling er-ro r and payload unc e rtainty. The proposed sliding mode control is presented in two theorems. The bounded stability of the proposed control(More)
  • 1