A electron trace modeling program, VBGUN has been finished by VBEM.
利用虚边界元方法，开发了强流电子枪电子轨迹模拟程序VBGUN。
A whole trace-process framework of requirement change is drawn based on three tiers which are propagation & modeling, propagation path, and trace approach of requirement change.
基于需求信息传播与建模、需求变化信息传播路径和需求变化信息跟踪方法三个层面，阐述了软件变化跟踪的整体过程框架；
With matrix conversion of geometry optics as a basis, simulation and modeling for complex multi-lens imaging optical system for four-quad splitting are carried out through light ray trace.
以几何光学的矩阵变换为基础，通过光线追迹的方法，对四象限分光的多透镜成像复杂光学系统进行仿真建模。
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