Temperature characteristic of acoustic parameter in porcine liver in vitro 离体肝脏组织声学参量的温度特征研究
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Acoustic parameters measurement of viscoelastic material in median and high frequency 中高频段下的粘弹性材料声学参数测量
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An experimental research on the perception of sentence prominence in chinese and its acoustic parameter 强调范围对句子重音知觉的影响及其声学表现的研究
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The first task in the thesis is to make acoustic model . account practice transducer and other acoustic parameter " research and analyze arithinehc of echosotmder . research and analyze factors of influence system precision and me safety 论文中的首要工作是建立声学模型、计算出实际所需要的换能器以及其他的一些的声学参数、对测高的算法进行了研究分析、对影响系统精度以及准确正常工作的一些因素进行了分析。
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The main contributions are as follows : ( 1 ) de ( differential evolution ) algorithm is proposed to invert the ocean acoustic parameters in shallow water in order to get faster and more accurate results than ga ( genetic algorithm ) and sa ( simulated annealing algorithm ) . also a posteriori probability analysis method is applied to evaluate the uncertainty of inversion results . ( 2 ) maximum likelihood objective functions for broadband mfi are derived according to different conditions ( 2 )根据不同的前提条件，采用似然比的方法推导了宽带匹配场反演的最大似然目标函数；深入地研究了宽带匹配场处理中的相干与非相干问题；在分析参数反演的敏感性之后，提出了浅海环境参数宽带匹配场反演的多步优化策略，并与全参数反演方法进行了性能上的仿真比较。
