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(Th,U)O2 Pellets : Fabrication and Thermal Properties
강기원,양재호,김건식,송근우,이찬복,정연호 한국원자력학회 2003 Nuclear Engineering and Technology Vol.35 No.4
Fabrication technique of $(Th,U)O2 pellets has been investigated. Powder mixtures of $ThO_2\;and\;UO2 were milled in two different ways-dry and wet milling. Milled powder was compacted and sintered to $(Th,U)O2 pellets. The wet-milled powder leads to a $(Th,U)O2 pellet having a high sintered density and uniform distribution of U and Th, compared to the dry-milled powder. The sintered density of a $(Th,U)O2 pellet tends to decrease by increasing the content of $ThO2. The thermal conductivity of $ThO_2\;and\;(Th,U)O2 pellets was measured by the laser flash method. The thermal conductivity of the $ThO2 pellet is higher than that of the UO₂ pellet, and the thermal conductivities of $(Th,U)O2 pellets containing $65wt\%\;and\;35wt\%\;ThO2 pellets are lower than that of the UO₂ pellet.
The role of shape memory alloy on impact response of glass/epoxy laminates under low temperature
강기원,H. J. Kim,J. K. Kim 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.10
The paper aims to evaluate the impact response of glass/epoxy laminates with embedded shape memory alloy (SMA) subject to low velocity impact at various temperatures. For the goal, the impact tests were performed by using an instrumented impact-testing machine at three temperatures: 293K, 263K and 233K for the baseline (laminates without SMA wires) and SMA laminates (laminates with embedded SMA wires). And the resultant damages were inspected through the scanning acoustic microscope (SAM). Also, based on the impact force history and the damage configuration, the impact resistance parameters were employed to evaluate damage resistance of laminates with embedded SMA wires. As a result, it was observed that the damage resistance of glass/epoxy laminates is influenced by embedded SMA wires and embedding SMA wires into laminates does not compromise the structure any differently to laminates without wires. In fact, it has been shown that under lower temperature, the SMA laminates have a little superior damage resistance compared with the baseline laminates.
LMI 기법을 이용한 2자유도 표준모델에 대한 비결합 제어기의 H(sub)$\infty$ 설계
강기원,이종성,박기헌,Gang, Gi-Won,Lee, Jong-Sung,Park, Kiheon 제어로봇시스템학회 2001 제어·로봇·시스템학회 논문지 Vol.7 No.3
In this paper, the decoupling H(sub)$\infty$ controller which minimizes the maximum energy in the output signal is designed to reduce the coupling properties between the input/output variables which make it difficult to control a system efficiently. The state-space formulas corresponding to the existing transfer matrix formulas of the controller are derived for computational efficiency. And for a given decoupling $H_{\infty}$ problem, an efficient method are sought to find the controller coefficients through the LMI(Linear Matrix Inequalities) method by which the problem is formulated into a convex optimization problem.