共查询到20条相似文献，搜索用时 59 毫秒
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阈值分割是图像分割中的一种常用且有效的方法,其关键问题是搜索到最佳分割阈值.文中基于混沌优化理论,利用Lorenz混沌系统对图像进行了阈值分割,同时提出了一种基于耦合映象格子的时空混沌优化算法,并且将其应用于图像分割实验.实验表明,与Lorenz混沌优化算法相比,时空混沌优化算法用于阈值寻优能够给出更加理想的分割结果. 相似文献
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基于Matlab的超混沌系统同步方法仿真 总被引：1，自引：1，他引：0
为探讨超混沌同步机制,研究其在保密通信中的应用,以超混沌chen系统为研究对象,给出了超混沌系统的Matlab仿真步骤.利用复制、耦合等方法实现了耦合同步法仿真,借助于等间隔脉冲对收端系统进行控制,实现了脉冲同步法仿真.结果表明:超混沌耦合同步中,耦合系数大,则同步时间短;脉冲同步中,脉冲周期小,则同步时间短. 相似文献
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赵迪 《沙洋师范高等专科学校学报》2004,5(5):12-14
研究一种通过压缩非线性系统轨道的相空间实现混沌和超混沌控制的方法，并成功控制Henon映象、Lorenz系统和Rossler超混沌系统．结果表明：该方法能有效控制非线性系统中的混沌和超混沌行为．同时提出两个应用方案． 相似文献
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对于一个新的混沌系统,分析它的稳定性,采用自适应的方法实现了混沌系统的同步。用Lyapunov第二方法从理论上证明了该同步方法的有效性,接着又用Mlatlab软件对该同步系统进行仿真验证了同步方法的有效性,结果表明这种方法是快速有效的。 相似文献
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《绵阳师范学院学报》2016,(2):31-37
基于数值微分法和李雅普诺夫稳定性理论,研究了分数阶与整数阶混沌(超混沌)系统的自适应广义矩阵同步.根据目标函数的具体形式设计出合适的自适应控制器,使得含未知参数的整数阶混沌(超混沌)系统可以同步于分数阶混沌(超混沌)系统.四组分数阶与整数阶混沌(超混沌)系统的数值仿真实验结果显示了该设计的自适应控制器的有效性.表现在同步误差系统快速收敛到零,在自适应控制器的作用下,两个混沌系统能够快速实现同步;系统未知的参数也快速收敛于其真值. 相似文献
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黄娟娟 《湖州师范学院学报》2008,30(2)
基于自通适应控制策略和Lyapunov稳定性理论,在参数未知的情况下,讨论了超混沌Qi系统与趟混沌Chen系统的异结构同步、设计控制器和参数估计率,实现了两个具有不同结构的超混沌系统的同步,方法简单有效,易于实现,理论分析和数值仿真的结果均证明了该方法的可行性,且该办法可以用来实现其他的超混沌系统的同步. 相似文献
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尹小舟 《连云港职业技术学院学报》2008,21(3):13-15
采用反馈线性化方法实现混沌同步,以Lorenz系统这个典型混沌系统为例,从理论和数值上研究了这种混沌同步方法。模拟结果表明,Lorenz系统在新的动力学的基础上达到完全同步。 相似文献
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本文利用控制理论、稳定性理论,对一自治混沌系统的同步问题进行了研究,采用自适应单控制器实现混沌系统同步的方案,并证明了所述方案的正确性.最后的数值仿真,成功地利用该方案实现了混沌系统的同步,表明所得方法的有效性和实用性. 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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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 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
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献