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Relay Protection Sport Systems Based on MATLAB-Based Simulation Technology
Xiaojun He 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.1
MATLAB-based simulation technology can support the analysis and design of relay protection sport systems. A simulation model is built for the study of sport system relay protection. As an example, the sport system fault simulation, zero-sequence current protection simulation and transformer differential protection simulation are presented herein. The case studies show that the simulation of sport system relay protection is effective and feasible.
MIGRATION OF CHARGED SPECIES IN LIPID BILAYER MEMBRANES UNDER AN ELECTRIC FIELD
XIAOJUN HAN,Lei Wang,CHANGJUN GUO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.1
This paper reviews recent progress in studies on the migration of charged species, includingcharged lipids, membrane-attached proteins and vesicles, and integrated membrane proteins, inlipid bilayer membranes under an external electric field. The migration of these charged substancesis controlled by the interplay of electrophoresis and electroosmosis. This phenomenon canbe employed to separate the charged lipids and membrane-attached proteins, and concentrateintegrated membrane proteins.
Longitudinal Dynamic Response of Pile Foundation in a Nonuniform Initial Strain Field
Xiaojun Tian,Wentao Hu,Xiaonan Gong 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.6
This paper presents an investigation into the dynamic response of pile and soil due to pile installation in a radially inhomogeneous initial strain field. The radial variation rule for the shear modulus and physical parameters of the soil caused by the initial strain field is deduced. On the basis of the plane strain and complete P-S (pile-soil) contact assumptions, the analytical solution of longitudinal dynamic impedance of the soil is derived by means of subdividing the soil domain into a number of annular vertical zones. The longitudinal impedance of the pile top and velocity response in frequency and time domains, are also obtained. The parametric study of interfacial pressure on the dynamic response of P-S system is undertaken within a relatively lower frequency domain. Comparison results between previous solutions and the present study indicates that the analytical solution derived in this paper is more stable.
Xiaojun Li,Bowen Li,Benxu Yu,Yun Ren,Bo Chen 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
The physical mechanism of flow unsteadiness is one of the key problems in cavitating flow. Significant efforts have been exerted to explain the cavitation-vortex interaction mechanism. As well, the process of kinetic energy transport during the evolution of unsteady cavitating flow must be elucidated. In this work, 2D calculations of cavitating flow around a NACA66 hydrofoil were performed based on the open source software OpenFOAM. The modified shear stress transport k-ω turbulence model, which considers curvature and turbulent eddy viscosity corrections, was employed to close the governing equations. The Schnerr-Sauer cavitation model was adopted to capture the cavitation phase change process. Numerical results showed reasonable consistency with the results of the experiments conducted by Leroux et al. (2004). The results showed that cavitation promotes turbulence intensity and flow unsteadiness around the hydrofoil. During the attached sheet cavity growth stage, high-value regions of turbulent kinetic energy are located substantially at the interface of the cavity, particularly at the rear portion of the cavity region. During the cloud cavity shed-off stage, the cavity begins to break off and the maximum value of turbulent kinetic energy is observed inside the shed cavity. Finally, the influence of cavitation on the turbulence intensity is illustrated using the turbulent kinetic energy transport equation, which shows that the pressure diffusion and turbulent transport terms dominate as cavitation occurs. In addition, cavitation promotes turbulence production and increases dissipation with fluid viscosity and flow unsteadiness. The viscous transport term only acts in the cavitation shedding stage under large-scale vortex shedding. Overall, these findings are of considerable interest in engineering applications.
Homogeneous multilinear functions on hypergraph cliques
Xiaojun Lu,Qingsong Tang,Xiangde Zhang,Cheng Zhao 대한수학회 2017 대한수학회보 Vol.54 No.3
Motzkin and Straus established a close connection between the maximum clique problem and a solution (namely graph-Lagrangian) to the maximum value of a class of homogeneous quadratic multilinear functions over the standard simplex of the Euclidean space in 1965. This connection and its extensions were successfully employed in optimization to provide heuristics for the maximum clique problem in graphs. It is useful in practice if similar results hold for hypergraphs. In this paper, we develop a homogeneous multilinear function based on the structure of hypergraphs and their complement hypergraphs. Its maximum value generalizes the graph-Lagrangian. Specifically, we establish a connection between the clique number and the generalized graph-Lagrangian of $3$-uniform graphs, which supports the conjecture posed in this paper.
GENERALIZED SCHWARZ LEMMAS FOR MEROMORPHIC FUNCTIONS
Xiaojun Huang,Ling Chen 대한수학회 2012 대한수학회보 Vol.49 No.2
In this paper, we prove an analog of the generalized Schwarz lemma for meromorphic functions. Our results improve the classical generalized Schwarz lemma.
An Improved PSO Algorithm Based on Mutation Operator and Simulated Annealing
Xiaojun Deng,Zhiqiang Wen,Yu Wang,Pingan Xiang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.10
Particle swarm optimization (PSO) algorithm is simple stochastic global optimization technique, but it exists unbalanced global and local search ability, slow convergence speed and solving accuracy. An improved simulated annealing (ISAM) algorithm is introduced into the PSO algorithm with crossover and Gauss mutation to propose an improved PSO (ISAMPSO) algorithm based on the mutation operator and simulated annealing in this paper. In the ISAMPSO algorithm, the mutation operator of genetic algorithm is introduced into the SA algorithm as a generation mechanism of new solution in order to propose an improved simulated annealing algorithm with mutation (ISAM). Then the ISAM algorithm is introduced into the PSO algorithm to jump out the local optimum, effectively achieve the global optimum adjust and optimize the population, maintain the diversity of the population, improve the local search ability and convergence speed. Six classical functions are selected to test the performance of the proposed ISAMPSO algorithm. The simulation experiments results show that the proposed ISAMPSO algorithm can effectively overcomes the stagnation phenomenon and enhance the global search ability. The convergence speed and accuracy were better than the PSO algorithm.
Xiaojun Gu,Yonggyun Kim 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
Juvenile hormone is the most important hormone inside the insect, but its circulating titer should be under tight control. Then enzymes involved in JH metabolism, especially juvenile hormone esterases (JHEs) play critical roles in insect metamorphosis and reproduction. Within a set of 11 JHEs predicted in the diamondback moth (DBM) genome, Plutlla xylostella (Linn.) we identified one gene that contained the main functional motifs of insect JHEs. Its expression and transcript levels during egg, different instar of larvae, prepuae, pupae and adult stages were measured. Also, its expression in the epidermis, midgut and fatbody of the 4 th instar larvae was compared. The changes in enzyme activity in the 4th instar larvae were determined.