共查询到19条相似文献,搜索用时 62 毫秒
1.
An algorithm is given for computing in a very efficient way the topology of two real algebraic plane curves defined implicitly.The authors preform a symbolic pre-processing that allows us later to execute all numerical computations in an accurate way. 相似文献
2.
吴文俊 《系统科学与复杂性》1989,(2)
Let a moving plane MP over a fixed plane FP occupy four different positions.Eachpair of such positions is associated with a center of rotation called pole so that we have a 6-poleconfiguration.As an illustration of our general method of mechanical theorem proving and discovering,we discuss in the present paper in some derails certain theorems connected with such a configuration. 相似文献
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Guo Huiping & Liu Xueguan Dept. of Communication Electronics Suzhou University Suzhou P. R. ChinaYin Hongcheng & Huang Peikang National Electromagnetic Scattering Laboratory Beijing P. R. China 《系统工程与电子技术(英文版)》2002,13(4)
The reflection and transmission characteristics of an anisotropic half-space medium normally illuminated by a plane wave are analyzed by kDB coordination. The general formula of reflection coefficient at the air-medium interface is given, and its validity is also discussed. The possible propagating modes in different mediums and the effect of medium parameters on these modes are emphatically studied. This work provides the theoretical preparations for the parameter reconstruction of an anisotropic material. 相似文献
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BingtuanWang DiWang LichengChen 《系统科学与信息学报》2004,2(4):721-726
By using analytic geometric method, a new algorithm is advanced on quick locating for turning points in discrete point set of plane curve. The algorithm is simple in structure and has high computation efficiency, and can quickly locate for turning points in discrete point set of plane parameter curve as well. 相似文献
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Shurong LI Chunwang HOU 《系统科学与复杂性》2007,20(1):108-118
In this paper, the collision problem of two moving objects is investigated. The objects are described by two algebraic sets (ellipses or circles in the paper). The collision problem discussed involves both static and dynamic case. The static case is that each object moves with known velocity. We use nonlinear programming to decide whether the objects collide. The dynamic case is that each object is controlled by a constraint external force which can be regulated online. For the dynamic case, the collision problem can be modelled as a Minmax problem which can be solved by using differential games. If collision occurs, the time and place of the first collision are given. The moving trajectories are provided in the paper. 相似文献
6.
XU Zeshui 《系统科学与复杂性》2002,15(4):407-415
This paper presents a new method for constructing synthetic matrix which is obtained by extending the given judgement matrices in the Analytic Hierarchy Process(AHP).The consistency relationship among the given matrices and therir synthetic matrix is studied.The method can be used to deal with situations where the number of the given alternatives is larger than nine,and needs less pairwise comparisons thanany others.Thus it will aid in the design of the AHP,which will reduce the information overload of decision maker,a major drawback of the original AHP algorithm.Finally,a numerical example is given to show the feasibility and effectiveness of the method. 相似文献
7.
XU Zeshui 《系统科学与复杂性》2002,(4)
This paper presents a new method for constructing synthetic matrix which is obtained by extending the given judgement matrices in the Analytic Hierarchy Process (AHP). The consistency relationship among the given matrices and their synthetic matrix is studied. The method can be used to deal with situations where the number of the given alternatives is larger than nine, and needs less pairwise comparisons than any others. Thus it will aid in the design of the AHP, which will reduce the information overload of decision maker, a major drawback of the original AHP algorithm. Finally, a numerical example is given to show the feasibility and effectiveness of the method. 相似文献
8.
The soliton resolution conjecture proposes that the initial value problem can evolve into a dispersion part and a soliton part. However, the problem of determining the number of solitons that form in a given initial profile remains unsolved, except for a few specific cases. In this paper, the authors use the deep learning method to predict the number of solitons in a given initial value of the Korteweg-de Vries(Kd V) equation. By leveraging the analytical relationship between Asech2(x) initial v... 相似文献
9.
ZHANG Lianzhu 《系统科学与复杂性》2000,(2)
A hexagonal system is regarded as a 2-connected plane graph in which every finite region is aregular hexagon of unit side length. Hexagonal systems are of great importance for theoreticalchemistry because they are the natural graph representation of benzenoid hydrocarbonsll].Merrifield-Simmons index of a hexagonal system was extensively studied in connection withcertain topological problems of chemistry[']. A hexagonal chain is a hexagonal system with theproperties that (a) it has no vertex be… 相似文献
10.
The necessary and sufficient conditions for a linear estimator of a linear estimable functionof regression coefficients in a general fixed effects linear model with the assumptions of normality to beadmissible in the class of all estimators under matrix liss function are given.For a general randomeffects or mixted effects linear model the necessary and sufficient conditions are obtained too. 相似文献
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The paper presents a total quality management (TQM) framework combining the concepts underlying the notions of total quality control (TQC), Just in Time (JIT), manufacturing resource planning (MRP), and quality control circles (QCCs). An integrative model, in which these notions and the related issues are complementarily connected on the same logical plane is presented and it is argued that this is akin to the total systems intervention (TSI) approach in its endeavor to seek manufacturing excellence. It also has similarities to creative problem solving, especially with regard to corporate strategy, but here with an emphasis on the role of manufacturing. However, TQM is an idea of its own, and not a conceptual derivative of systems theory. 相似文献
13.
1 .INTRODUCTIONItisknownthatphysicaloptics(PO)hasbeenwidelyusedinfastpredictionofradarcrosssection (RCS)ofacomplexconductingorcoatedobject.POisadoptedwithoutexceptionamongtheissuedfamouscomputa tionalsoftwareofhigh frequencyEMscatteringbyacomplexobjectsuchasRECOTA[1 ] ,GRECO[2 ,3] ,X PATCH[4] ,whereonlytheisotropiccoatingisconcerned .However,theanisotropiccoatingencoun teredinsomepracticalapplicationsimpelsonetofindthesuitablesolutionforhigh frequencyscatteringbytheobjectcoatedwi… 相似文献
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YANG Xiaojing 《系统科学与复杂性》1997,(1)
1.IntroductionT.Dated]obtainedanalgebraicclassificationofplanehomogeneousquadraticvectorfields,A.Cima[2]gaveanalgebraicandtopologicalclassificationofhomogeneouscubicvectorfieldsintheplane.Theirmethodswerebasedontheclassificationofforth-orderbinaryformsdev… 相似文献
16.
基于神经网络的军用飞机故障预报系统研究 总被引:4,自引:0,他引:4
在军用航空领域 ,及时准确的故障预报对提高飞行器的安全性具有极其重要的意义。针对飞机故障预报系统的设计要求 ,考虑到神经网络用于故障预测的优点 ,在神经网络技术应用于军用飞机的故障预测过程中提出了神经网络模型的训练算法。把神经网络、预测理论、专家系统有机地结合起来建立了一个故障预报系统。并以某型军用飞机冷气系统的典型故障为例 ,实现了故障的预测。实例预测结果证明 ,给出的神经网络预测模型和训练算法是可行的 相似文献
17.
DU Hong 《系统科学与复杂性》1994,(4)
ONTHEISOMORPHISMSOFSMOOTHALGEBRAICCURVES(Ⅰ)DUHong(InstituteofSystemsScience,AcademiaSinica,Beijing100080,China)Abstract:Inthi... 相似文献
18.
无人机在快速接敌的过程中,传统的导引方法很容易将无人机导引到敌机的火力攻击范围之内.而且传统比例导引法系数的最优解与目标和载机的距离有关,一旦目标机动或存在干扰,跟踪效果都会变差.为此提出了一种基于数据链的无人机变结构对抗攻击导引方式,并进行仿真研究.仿真结果表明,该方法不仅避免把无人机导引到敌机的火力攻击范围之内,而且减小了无人机所需过载,提高了制导精度、速度和鲁棒性,限制了视线角速度. 相似文献
19.
Robust control of uncertain time delay system:a novel sliding mode control design via LMI 总被引:2,自引:0,他引:2
Qu Shaocheng~ & Wang Yongji~ . Dept. of Information Technology Huazhong Normal Univ. Wuhan P. R. China . Dept. of Control Science Engineering Huazhong Univ. of Science Technology Wuhan P. R. China 《系统工程与电子技术(英文版)》2006,17(3):624-628
1 .INTRODUCTIONTi me-delay commonly occurs in various industrialsystems ,such as turbojet engines , electrical net-works ,automotive systems ,and chemical process ,etc .Its existenceis usually a source of poor systemperformance ,or instability . Hence ,the control ofti me delay systems has received considerable atten-tion over the past two decades , and different de-sign approaches have been proposed[1]. We wouldlike to point out SMC is a reasonable method tostabilize the uncertain ti me… 相似文献