Sung Min Yoon

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The effects of electrode materials on the device stabilities of In-Ga-Zn-O (IGZO) thin-film transistors (TFTs) were investigated under gate- and/or drain-bias stress conditions. The fabricated IGZO TFTs with a top-gate bottom-contact structure exhibited very similar transfer characteristics between the devices using indium-tin oxide (ITO) and titanium(More)
This paper deal with an identification of a single rod hydraulic cylinder system and its motion control. Modeling and control of the electro-hydraulic servo system are difficult because system contains nonlinear elements. Therefore, this paper use the signal compression method to obtain the dynamic characteristic and apply the sliding mode control with(More)
ZnO nanoparticles (NPs) with monolayer structures were prepared by atomic layer deposition (ALD) to use for a charge-trap layer (CTL) for nonvolatile memory thin-film transistors (MTFTs). The optimum ALD temperature of the NP formation was demonstrated to be 160 °C. The size and areal density of the ZnO NPs was estimated to be approximately 33 nm and 4.8 ×(More)
Many surgical robots adopt a tendon driven mechanism using cable and pulley to transmit the power. However, although tension is the main medium of power structurally, it is directly related with cable material characteristics including not only elastic region which make it able to use fixed spring constant but also nonlinear elastic and yielding one.(More)
In this paper, we have investigated the phase change memory device with U-shaped bottom electrode using three-dimensional finite element analysis tool. From the simulation, the reset current of PRAM with U-shaped bottom electrode is greatly reduced, compared with the conventional device. And the experimental result clearly shows that the PRAM with U-shaped(More)
Instead of single mobile robot, multi mobile robots can perform complex tasks with simple robot system and algorithm. But multi mobile robots face much more complex driving problem than singular driving. To solve the problem, in this study, driving algorithm based on the energy method is applied to the individual robot in a group. This makes a cluster be in(More)
Recently, there is growing trend to build the high-rise and install curtain walls. Following this trend, we developed robot for building wall cleaning work, which moves along Built-in guide rail of building. Because it moves attached at building wall for cleaning work, it can be seriously affected by potential threats, like earthquake, strong wind,(More)