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基于Installshield的安装程序动态序列号产生算法及实现 被引量:1
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作者 翟龙军 曲洪东 +2 位作者 高山 谢岩松 张华 《海军航空工程学院学报》 2004年第5期573-576,共4页
文中给出了一种基于硬盘序列号和系统时间的软件动态序列号产生算法.在Installshield6.x环境下,给出了基于该算法的软件动态序列号的实现.同时,讨论了动态序列号算法的解密算法及其解密程序,并给出了在Labwindows5.0环境下的解密程序的... 文中给出了一种基于硬盘序列号和系统时间的软件动态序列号产生算法.在Installshield6.x环境下,给出了基于该算法的软件动态序列号的实现.同时,讨论了动态序列号算法的解密算法及其解密程序,并给出了在Labwindows5.0环境下的解密程序的实现. 展开更多
关键词 动态序列号 算法 INSTALLSHIELD 安装程序
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High-Sensitivity Acquisition of Ultrahigh Dynamic Direct Sequence Spread Spectrum Signals in Space Communications 被引量:2
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作者 徐颖 袁洪 《China Communications》 SCIE CSCD 2013年第10期26-36,共11页
According to the requirements of the high-sensitivity acquisition of Direct Sequence Spread Spectrum(DSSS) signals under ultrahigh dynamic environments in space communications, a three-dimensional joint search of the ... According to the requirements of the high-sensitivity acquisition of Direct Sequence Spread Spectrum(DSSS) signals under ultrahigh dynamic environments in space communications, a three-dimensional joint search of the phase of Pseudo-Noise-code(PN-code),Doppler frequency and its rate-of-change is presented to achieve high sensitivity in sensing high-frequency dynamics. By eliminating the correlation peak loss caused by ultrahigh Doppler frequency and its rate-of-change offset,the proposed method improves the acquisition sensitivity by increasing the non-coherent accumulation time. The validity of the algorithm is proved by theoretical analysis and simulation results. It is shown that signals with a carrier- to-noise ratio as low as 39 dBHz can be captured with high performance when the Doppler frequency is up to ±1 MHz and its rate-of-change is up to ±200 kHz/s. 展开更多
关键词 direct sequence spread spectrum signals space communications ACQUISITION high sensitivity ultrahigh dynamic
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CATALAN NUMBERS, DYCK LANGUAGE AND TIME SERIES OF ELEMENTARY CELLULAR AUTOMATON OF RULE 56 被引量:1
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作者 QINDakang XIEHuimin 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2005年第3期404-418,共15页
A new approach to study the evolution complexity of cellular automata is proposed and explained thoroughly by an example of elementary cellular automaton of rule 56. Using the tools of distinct excluded blocks, comput... A new approach to study the evolution complexity of cellular automata is proposed and explained thoroughly by an example of elementary cellular automaton of rule 56. Using the tools of distinct excluded blocks, computational search and symbolic dynamics, the mathematical structure underlying the time series generated from the elementary cellular automaton of rule 56 is analyzed and its complexity is determined, in which the Dyck language and Catalan numbers emerge naturally. 展开更多
关键词 elementary cellular automaton time series distinct excluded block dycklanguage catalan numbers
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