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环形序列最大长度上下限和求解最长线形序列
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作者 程奇 左垲 《电子学报》 EI CAS CSCD 北大核心 1990年第1期119-122,共4页
文献[1]提出了线形图和环形图的概念。本文据此提出了环形序列和线形序列的概念,扩展了文献[1]中的概念。本文讨论了最长环形序列的性质,给出环形序列最大长度的取值范围。最后,完整地给出了一种求最长线形序列的方法。
关键词 数据结构 环形序列 线形序列 计算
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一类随机环境下非线性时间序列模型的遍历性分析
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作者 林海波 俞政 蒋贵松 《数学理论与应用》 2006年第3期116-118,共3页
本文主要讨论由模型Xn+1=h(en+-q(n+1),-en,Xn+1-p(n+1),…Xn)+en+1所确定的序列{Xn,n 1}的极限行为.
关键词 随机环境 线形时间序列 遍历性
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基于真实文本的[A_单+N(NP)]的句法受限机制和句法组合机制
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作者 祁峰 《语言文字应用》 CSSCI 北大核心 2008年第4期133-138,共6页
本文根据语料库研究现代汉语真实文本中的[A单+N(NP)]线性序列的句法受限机制,总结出[A单+N(NP)]的八条受限规则,并对[X+A单+N(NP)+Y]语法组合的句法组合机制进行了思考,以对自然语言的计算机处理提供基础的语言知识库支持。
关键词 线形序列 句法受限机制 语法组合 句法组合机制
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推进系统综合性能寻优控制研究 被引量:12
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作者 任新宇 杨育武 樊思齐 《推进技术》 EI CAS CSCD 北大核心 2010年第1期61-64,81,共5页
研究了包括进气道和发动机在内的推进系统综合控制。采用了序列线性规划方法进行系统寻优,利用推进系统矩阵进行多次线性规划来求解非线性优化问题。利用当前的实际机载计算机完成了硬件在回路仿真试验,仿真表明研究的性能寻优控制方法... 研究了包括进气道和发动机在内的推进系统综合控制。采用了序列线性规划方法进行系统寻优,利用推进系统矩阵进行多次线性规划来求解非线性优化问题。利用当前的实际机载计算机完成了硬件在回路仿真试验,仿真表明研究的性能寻优控制方法能够较大幅度的提高推进系统整体性能,控制软件完全满足实时计算要求。 展开更多
关键词 推进系统 性能寻优控制 序列线形规划
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SUCCESSIVE BEAMFORMING,MULTIUSER DETECTION AND DIVERSITY RECEPTION FOR MULTICARRIER DS-CDMA SYSTEM WITH ANTENNA ARRAY
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作者 Yang Wei Chen Junshi +1 位作者 Tan Zhenhui Cheng Shixin 《Journal of Electronics(China)》 2007年第5期607-612,共6页
Code-Division Multiple-Access (CDMA) systems are interference limited,and therefore efficient interference management is necessary to enhance the performance of a CDMA system.In this paper,a successive beamforming (sp... Code-Division Multiple-Access (CDMA) systems are interference limited,and therefore efficient interference management is necessary to enhance the performance of a CDMA system.In this paper,a successive beamforming (spatial filtering),linear decorrelating MultiUser Detection (MUD, temporal filtering) and diversity reception structure for uplink multicarrier Direct Sequence CDMA (DS-CDMA) system with antenna array are proposed.By beamforming,the antenna array suppresses interference according to the distinct array signature.Subsequently,linear decorrelating MUD is ap- plied to separate the signals of different users and eliminate Multiple Access Interference (MAI).Finally, the decorrelated signals at different subcarriers that belong to the same user are combined to achieve frequency diversity.Simulation results show that the proposed structure offers significant Bit Error Rate (BER) performance improvement by successively exploiting the space-time-frequency processing. 展开更多
关键词 Antenna array Multicarrier Direct Sequence Code-Division Multiple-Access (DS-CDMA) MultiUser Detection (MUD) Diversity
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Broader pattern of tandem repeats in the mitochondrial control region of Perciformes 被引量:2
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作者 崔朝霞 刘媛 朱嘉濠 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2010年第4期785-794,共10页
Perciformes,the largest order of vertebrates with 20 suborders,is the most diverse fish order that dominates vertebrate ocean life.The complete mitochondrial control region(CR) of Trichiurus japonicus(Trichiuridae,Sco... Perciformes,the largest order of vertebrates with 20 suborders,is the most diverse fish order that dominates vertebrate ocean life.The complete mitochondrial control region(CR) of Trichiurus japonicus(Trichiuridae,Scombroidei) and Pampus sp.(Stromateidae,Stromateoidei) were amplified and sequenced.Together with data from GenBank,the tandem repeats in the mitochondrial CR from 48 species,which covered nine suborders of Perciformes,are reported in this study.The tandem repeats tend to be long in the suborder Percoidei and Stromateoidei.The identical repeats in 21 species of Cichlidae suggest a common origin and have existed before species divergence.Larimichthys crocea shows tandem repeats instead of the typical structure of the central conserved sequence blocks,which was first reported in Perciformes and vertebrates.This might have resulted from interruption of the polymerase activity during the H-strand synthesis.The four broader patterns presented here for the tandem repeats,including those in both the 5' and 3' ends,only in the either 5' or 3' end,and in the central conserved domain of the control region,will be useful for understanding the evolution of species. 展开更多
关键词 MTDNA control region tandem repeats PERCIFORMES EVOLUTION
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On Dickson Polynomials and Difference Sets
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作者 曹喜望 丘维声 《Journal of Mathematical Research and Exposition》 CSCD 北大核心 2006年第2期219-226,共8页
In 1998, Maschietti constructed several cyclic difference sets from monomial hyperovals. R. Evans, H.D.L. Holloman, C. Krattnthaler and Qing Xiang gave an algebraic proof of the two autocorrelation property of the rel... In 1998, Maschietti constructed several cyclic difference sets from monomial hyperovals. R. Evans, H.D.L. Holloman, C. Krattnthaler and Qing Xiang gave an algebraic proof of the two autocorrelation property of the related binary sequence. In this paper, we show that hyperovals are very closely related to two-to-one maps, and then we proceed to generalize Maschietti's result. 展开更多
关键词 cyclic difference sets permutation polynomials hyperovals two-to-one maps binary sequences.
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