共查询到20条相似文献，搜索用时 578 毫秒
1.
文章介绍了一种车辆防盗定位系统的设计方案．系统主要由三个部分组成：GPS接收器、GSM短消息收发器和单片机控制器．系统一旦检测到异常情况（如车辆位置改变）,就可通过SMS进行报警．另外,还可通过SMS设置与查询系统的警戒状态．最后,给出了系统的测试结果． 相似文献
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张艳 《赣南师范学院学报》2009,30(3):10-13
新Lu混沌系统是一类重要的新混沌系统,它显示了不同于以往混沌系统的复杂的动力学特性．文章主要研究了新Lu混沌系统与统一混沌系统的同步控制问题．基于Lyapunov稳定性定理,利用主动控制和非线性反馈控制均实现了两混沌系统的异结构同步．同时,严格的数学理论分析和数据仿真结果都证明了控制方法的有效性． 相似文献
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信号随时间变化的功率谱能清楚地说明随机系统的噪声特性．我们从一个典型的带延迟的随机系统模型出发,详细推导了此系统的功率谱．在一定的条件下,此模型可以简化,其结果和Nicola等人的结果符合地很好． 相似文献
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张仁忠 《商丘师范学院学报》1995,(Z1)
本文用微分几何方法研究了时变仿射非线性系统的动态补偿线性化问题，给出了系统的动态状态反馈线性化的充要条件．这里给出的结果可以看作对原有的静态状态反馈线性化结果的一个推广． 相似文献
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从系统与结构的观点出发研究了工业排产的开发策略．用系统动力学（ＳＤ）方法建立了系统的决策过程模型．研究了某城市工业生产的发展趋势，给出在各种投资模式下各项经济指标的变化方向．通过定量方法与计算技术对经济理论进行了综合．系统采用ＤＹＮＡＭＯ软件工具，计算机模拟运行获得满意结果． 相似文献
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简进2D-WHT的快速算法．提出了基于此算法的宴时图象降噪系统；给出了系统的结构框图．软件模拟结果及其物理意义的诠释；最后给出硬件设计框图以及系统应用范围。 相似文献
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描述了语音质量客观评判系统的硬件功能结构和设计思想,详细的分析了算法原理和软件编程实现．该系统选用Matlab和Lab Windows／CVI的结合作为软件设计的编程平台,并根据主观听觉模型,运用MEL频率倒谱算法,建立起一套语音客观评判准则．本系统解决了人工检查费时、费力工效低,且评判不客观等问题．实践证明该评判系统给出的结果与基于人的听觉主观感受完全一致,与主观平均意见分值（MOS）法评价结果的相关度不低于0．9． 相似文献
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提出了一类基于比率,具有HollingⅢ功能性反应,且食饵有避难所的Leslie捕食食饵系统．通过构造恰当的Dulac函数,得到了保证该系统正平衡点全局渐近稳定的充分条件．其后,通过利用Bendixson环域定理,进一步证明了在一定条件下系统存在极限环．最后,用数值模拟验证了结果． 相似文献
9.
研究一类捕食者——食饵系统的正周期解的存在性．利用重合度理论。得到了关于该类系统的正周期解的存在性的新结果，其定理条件比现有结果的条件更为简单，容易验证与应用． 相似文献
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一类新超混沌系统及其自同步 总被引：2，自引：0，他引：2
高智中 《常熟理工学院学报》2011,25(8):31-34
基于一个三维混沌系统构造了一个新的四维超混沌系统,利用系统的分岔图、Lyapunov指数谱图和相图分析方法研究了该系统的运动规律．根据线性系统稳定性定理,设计了一种非线性反馈控制器,实现了该超混沌系统的自同步,数值模拟结果验证了理论分析的正确性． 相似文献
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
13.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
17.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献