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In the simulation of electromagnetic (EM) scattering under the excitation of an EM pulse, high spatial resolution is needed in the regions with fast field oscillations, which propagate in space and time. The use of a uniformly dense mesh in the entire solution domain would increase the number of degrees of freedom and the resulting simulation time significantly. To efficiently capture the variation...
Multi-Functional Bidirectional AC/DC T-type 3-Level Converter for Super UPS is investigated in this paper. The AC/DC converter is used as the interfaced between DC Bus and Energy Source or Load. According to the components (grid, gas turbines, AC loads) connected in AC side, The AC/DC converter operates at AC voltage source mode, Power source mode or DC voltage source mode. A control scheme for the...
This paper presents a novel start-up scheme for the modular multilevel converter. Firstly a charging process model is introduced and the process of the proposed start-up scheme is presented. Then the maximum current and current-time formula during the charging process is derived. The mathematical solution of the formulas is used to compare with the results from a three-phase simulation using Matlab/Simulink...
Agent-based simulation models provide a way to investigate social phenomena that complement existing social science methods. Recent advances in computing hardware such as the wide availability of multi-core CPUs and increased main memory capacities make it possible to investigate population-scale phenomena using commodity compute resources. This paper describes experiences made in the development...
A generalized quadrature formula was introduced to estimate the numerical solutions of the integral of convex functions. The formula was composed of the difference between two parts of the areas of the trapezoid and the weighted convex patch. The range of weight coefficient of the convex patch was from 0 to 1 evaluated by the Hadamard's inequality. Tuning the weighted value of the convex patch could...
Leader-member exchange (LMX) has been found as significant and positive impacts in organizational leadership studies. Thus, it's important to conduct further study of the antecedents of LMX. Based on the fact that past research has less concerned about the subordinates' intentions in dealing with interpersonal emotions, this study used subordinates' attachment styles as the antecedent of LMX, in which...
This paper simulates human visual perception with regard to visual adaptation under the change of illumination. To reflect visual adaptation in scene rendering, we adopt the mathematic models simulating photopic, scotopic, and mesopic vision. We also take consideration the characteristic that adaptation to low visibility takes longer than high visibility. As a result, the outcome of the animation...
This paper develops a vendor managed inventory (VMI) dynamics based on the fuzzy arithmetic. The VMI has been used to reduce the "Bullwhip Effect" in supply chain. This research observes and analyzes the phenomena of VMI by system dynamics based on fuzzy arithmetic of the weakest t-norm (TW). The traditional crisp system dynamics has been widely used. However, it is observable that some...
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