采用Baum-Welch重估计算法对隐马尔科夫模型进行训练，使得结果达到最优化-Using Baum-Welch re-estimation algorithm for training hidden Markov models, making the results of optimized

通过是与有限差分法，使用matalb模拟二维光子晶体-simulation of EM wave in two-dimensional photonic crystals using fdtd