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Al₂O₃物性(Ⅰ) : 粉末法에 依한 α-Al₂O₃의 構造解析 The structure analysis of α-Al₂O₃ by powder method
白南柱,朴載昊,陳光守,黃海善 부산대학교 1972 論文集 Vol.13 No.1
The molecular structure of α-Al₂O₃ is well known being already analyzed by the power method of X-Ray. The diffraction angles of X-Ray beam are measured by the intensity distribution of diffraction beam of X-Ray. The structure of α-Al₂O₃ was Supposed to be a rhombohedron and the Miller-index was determined by a axial transformation from rhombohedral system to hexagonal system. As a result of this study, the lattice constant and axial angle were 5.1252±0.0017 Å and 55°17′ respectively, and the chemical unit per unit cell is two.
Development of gradient composite shielding material for shielding neutrons and gamma ray
Guang Hu,Guang Shi,Huasi Hu,Quanzhan Yang,Bo Yu,Weiqiang Sun 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.10
In this study, a gradient material for shielding neutrons and gamma rays was developed, which consists of epoxy resin, boron carbide (B4C), lead (Pb) and a little graphene oxide. It aims light weight and compact, which will be applied on the transportable nuclear reactor. The material is made up of sixteen layers, and the thickness and components of each layer were designed by genetic algorithm (GA) combined with Monte Carlo N Particle Transport (MCNP). In the experiment, the viscosities of the epoxy at different temperatures were tested, and the settlement regularity of Pb particles and B4C particles in the epoxy was simulated by matlab software. The material was manufactured at 25 °C, the Pb C and O elements of which were also tested, and the result was compared with the outcome of the simulation. Finally, the material's shielding performance was simulated by MCNP and compared with the uniformity material's. The result shows that the shielding performance of gradient material is more effective than that of the uniformity material, and the difference is most noticeable when the materials are 30 cm thick.
손광인 ( Guang Ren Sun ),고박 ( Bo Gao ),차용진 ( Yong Jin Cha ) 대한한의학원전학회 ( 구 대한원전의사학회 ) 2009 대한한의학원전학회지 Vol.22 No.4
We have explored the five-element pattern of 『River Tabte(河圖)』, in the 『Naegyeong(內徑)』, and conclude that this pattern is one of the five-element patterns applied in the 『Naegyeong』. Based on this pattern, we can exactly understand the eum(陰) and yang(陽) range of five Jang-organs, why the spleen is the extreme eum, why the spleen is the isolated Jang, how the spleen governs four seasons, the ascending and descending of visceral gi(氣), as well as why it can be applied in clinic that the spleen and stomach are the pivot of the ascending and descending of visceral gi(氣).
Research on Construction of Enterprise Informatization based on Model of Multi-agent RigidFormation
Li Sun,Ying Liu,Qiang Qu,Lilin Ma,Guang Yang,Hu Cao 보안공학연구지원센터 2014 International Journal of Grid and Distributed Comp Vol.7 No.6
Enterprise informatization is a large system including: input, output, feedback, operation inside, executive action and incentive measures. Inner-enterprise can be seemed as an artificially social organization unit composing of various agents in a rigid formation. This paper mainly proposes an enterprise informatization associated with rigid formation theory of multi-agent. The connection between agents and enterprise factors is represented. The relationship between enterprise factors is described by potential function theory: the attractive force presents that all factors have the same opinion, and the repulsive force presents that all factors have the different opinion needed to be solved. Finally, the simulation proves that the model mentioned in this paper is effective.
Tracking Control of Hypersonic Vehicles with Input Saturation Based on Fast Terminal Sliding Mode
Jing-Guang Sun,Shen-Min Song 한국항공우주학회 2019 International Journal of Aeronautical and Space Sc Vol.20 No.2
In this paper, the track problem of hypersonic vehicle is studied and analyzed with external disturbances, parameter uncertainty and input saturation. First, to make the design of controller convenient, the input and output linearized high-order model of hypersonic vehicle is transformed into a multi-variable second-order system model by introducing auxiliary error variables. To ensure the sliding mode manifold is practical finite time stable, an adaptive fast nonsingular terminal sliding mode controller is designed for hypersonic vehicle with unknown upper bound of disturbance. An adaptive anti-saturation fast nonsingular terminal sliding mode controller is designed by introducing hyperbolic tangent function an auxiliary system, which further solves the input saturation problem. Not only the requirement for actuator physical restraint is satisfied, but also the finite time stability of system sliding mode manifold is guaranteed at the same time. The vigorous proof is given using Lyapunov theory for the designed controllers. The numerical simulations are also conducted with the longitudinal nonlinear dynamic mode of hypersonic vehicle. The results demonstrate the effectiveness of the two designed controllers.
Jing-Guang Sun,Shen-Min Song,Hai-Tao Chen,Guan-Qun Wu 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
The tracking control problem of hypersonic vehicles is studied and analyzed in this paper using terminalsliding mode control method (TSMC) and non-homogeneous disturbance observer(NHDO) considering parametricuncertainty and external disturbances. Non-singular terminal sliding mode controller is provided based on NHDO. The key idea is that the NHDO is adopted to estimate the aerodynamic uncertainties and external disturbancessimultaneously, which can enhance the robustness of the system and lower the gain of the switch controller. Rigorousstability analysis for the closed-loop system is given via Lyapunov stability theory, which proves that thesystem states are always bounded even during the estimation process when the estimation error is not zero. Thesliding manifold can be reached in finite time and the tracking errors can converge to zero asymptotically. Numericalsimulations are conducted with the longitudinal nonlinear dynamic model of hypersonic vehicles to verify theeffectiveness and robustness of the designed controller.