We establish the global existence and uniqueness of classical solutions to the Cauchy problem for the 3-D compressible Navier-Stokes equations under the assumption that the initial density ||po||L∞ is appropriate...We establish the global existence and uniqueness of classical solutions to the Cauchy problem for the 3-D compressible Navier-Stokes equations under the assumption that the initial density ||po||L∞ is appropriate small and 1 〈 γ 〈 6/5. Here the initial density could have vacuum and we do not require that the initial energy is small.展开更多
为提高甚高频数据交换系统(very high frequency data exchange system,VDES)中应用特定消息(application-specific messages,ASM)的解码性能,提出一种基于循环冗余校验(cyclic redundancy check,CRC)的改进维特比纠错算法。通过合理降...为提高甚高频数据交换系统(very high frequency data exchange system,VDES)中应用特定消息(application-specific messages,ASM)的解码性能,提出一种基于循环冗余校验(cyclic redundancy check,CRC)的改进维特比纠错算法。通过合理降低符号状态数和使用部分CRC参与纠错,使该算法平衡了纠错性能和计算量,同时提出了新的分支度量以解决过于理想化的传统分支度量导致的性能损失。仿真表明,新分支度量相比传统分支度量提升了1dB的误帧率(packet error rate,PER)性能,在用12个CRC寄存器参与纠错的条件下,该方法比相干解调算法提升了1dB的PER性能,同时通过合理的符号状态数降低策略将计算量降为传统算法的1/4。展开更多
基金supported by National Natural Science Foundation of China (11001090)the Fundamental Research Funds for the Central Universities(11QZR16)
文摘We establish the global existence and uniqueness of classical solutions to the Cauchy problem for the 3-D compressible Navier-Stokes equations under the assumption that the initial density ||po||L∞ is appropriate small and 1 〈 γ 〈 6/5. Here the initial density could have vacuum and we do not require that the initial energy is small.
文摘为提高甚高频数据交换系统(very high frequency data exchange system,VDES)中应用特定消息(application-specific messages,ASM)的解码性能,提出一种基于循环冗余校验(cyclic redundancy check,CRC)的改进维特比纠错算法。通过合理降低符号状态数和使用部分CRC参与纠错,使该算法平衡了纠错性能和计算量,同时提出了新的分支度量以解决过于理想化的传统分支度量导致的性能损失。仿真表明,新分支度量相比传统分支度量提升了1dB的误帧率(packet error rate,PER)性能,在用12个CRC寄存器参与纠错的条件下,该方法比相干解调算法提升了1dB的PER性能,同时通过合理的符号状态数降低策略将计算量降为传统算法的1/4。