More practical ray tracing methods currently include the wavefront method, the shortest path method, the travel time epenthesis method, the eikonal equation finite difference method, etc.
当前实用性较强的射线追踪方法，包括波前法，最短路径法，走时插值法，程函方程有限差分法等。
Objeclive:To establish a two dimensional finite element analysis model for hard tissue morphology on lateral cephalometric X ray film.
目的：建立X线头颅侧位定位片硬组织形态二维有限元分析模型。
A finite automaton (FA) was used to build up the shallow water ray tracing model, and the model state, transition, event and action were analyzed.
用有穷状态自动机对浅海的声线追踪建模，给出了浅海声线追踪内在的状态及状态转移分析。
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