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。
Then, with some approximation to the wave front section, the forward modeling can be achieved through the ray tracing method based on the minimum traveling time and the shortest traveling trace assum.
然后，对波阵面作一近似，在此基础上，用最小走时最短路径射线追踪法完成正演。
Then, with some approximation to the wave front section, the forward modeling can be achieved through the ray tracing method based on the minimum traveling time and the shortest traveling trace assum.
然后，对波阵面作一近似，在此基础上，用最小走时最短路径射线追踪法完成正演。
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