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分割技法에 의한 不靜定트러스 構造物의 最適設計에 關한 硏究
李奎遠,林正煥,房基成 전북대학교 공업기술연구소 1990 工學硏究 Vol.21 No.-
This study is concerned with optimum design of indeterminate truss structres by decompositive method. Decompositive optimization was selected to optimize the truss structures which take multi-loading conditions, allowable and buckling stress constraints into consideration. Tha algorithm of this study is made up of section optimization using feasible direction method. This optimization algorithm is introduced so that it can achive a structural optimization carring out simulatainously the analysis and the design of structures. So the ADS that is a fortran program for solution of nonlinear constrained optimization problems is applied to solve this problem There it can be concluded as follows: The optimization of truss structure which utiluzes the results of this study can be helpful to the economical design of truss structure.
이규원,이철의,A. Gedanken,E. Sominski,Yu. Koltypin 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.6
We have studied the magnetic and the electric properties of La_(0.8)Sr_(0.2)MnO_3 (LSMO)nanoparticle-decorated carbon nanotubes (CNTs). The magnetic susceptibility showed a paramagnetic - superparamagnetic phase transition at TSP » 200 K with a blocking temperature of T_B ∼ 120 K, which can be attributed to the LSMO nanoparticles. At T_(SP), the charge transport taking place through the CNTs network showed a metal-insulator transition (MIT) characteristic of the LSMO nanoparticles, indicating a concomitant MIT in the CNTs triggered by the LSMO nanoparticles. In the metallic phase, the charge transport appears to be dominated by a 2D weak localization effect, which at temperatures below T_B was seen to be somewhat suppressed by the internal field. At temperatures below 50 K, a Kondo effect dominates the electric and the magnetic properties.
이규원,이철의 한국물리학회 2013 Current Applied Physics Vol.13 No.5
We have investigated the half-metallicity in hydrogenated carbon nanotubes under an electric field as a function of the electric field direction by using the density functional theory calculation. We found that the electric field required for the half-metallicity can be significantly reduced by controlling the field direction and the reduction rate increases with the nanotube diameter. The field direction effect can be understood in a simple model based on the electrostatic potential difference between the spatiallyseparated edges.
Edge-state magnetism in hydrogenated armchair carbon nanotubes
이규원,이철의 한국물리학회 2014 Current Applied Physics Vol.14 No.12
We have investigated the antiferromagnetic edge states in hydrogenated carbon nanotubes by using the density functional theory calculations. The total energy difference between the antiferromagnetic and ferromagnetic states, corresponding to the exchange energy gain stabilizing the antiferromagnetic state, changes by an order of magnitude by controlling the hydrogen adsorption pattern and is nearly independent of the nanotube size for a properly chosen pattern, indicating that the antiferromagnetic edge states in the real size nanotubes can be realized at high temperatures. The coexisting zigzag and bearded edges in the hydrogenated CNTs are believed to enhance the exchange energy gain.