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Search Results: 1 - 10 of 60498 matches for " DU Wei "
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Research on OD Matrix Calculation Based on Quantum Behaved Particle Swarm Optimization Algorithm  [PDF]
Lianyu WEI, Jianfu DU
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.25045
Abstract: Traffic information is so far less than the number of OD variables, that it is difficult to obtain the satisfactory solution. In this paper, a method based on Quantum behaved Particle Swarm Optimization (QPSO) algorithm is developed to obtain the global optimal solution. It designs the method based on QPSO algorithm to solve the OD matrix prediction model, lists the detailed steps and points out how to choose the PSO operator. Moreover, it uses MATLAB program-ming language to carry out the simulation test. The simulation results show that the method has higher efficiency and accuracy.
Estimate on Performance Evaluation of China’s Central Enterprise Listed Company Based on the EVA  [PDF]
Si Zhang, Jianwei Deng, Wei Du
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.48048

Since China joined the WTO, the enterprises, especially central enterprises, have actively participated in the international competition. Assessing the results of the operations and the asset utilization has become a top priority. To provide new investment ideas for investors, this paper introduces the EVA to assess the results of operation.

Reliable Facility Systems Design Subject to Edge Failures: Based on the Uncapacitated Fixed-Charge Location Problem  [PDF]
Yuangang Pan, Yali Du, Zongtian Wei
American Journal of Operations Research (AJOR) , 2014, DOI: 10.4236/ajor.2014.43016

The reliability of facility location problem has aroused wide concern recently. Many researchers focus on reliable and robust facility systems design under component failures and have obtained promising performance. However, the target and reliability of a facility system are to a large degree adversely affected by the edge failures in the network, which remains a deep study. In this paper, we focus on facility systems’ reliability subject to edge failures. For a facility location system, we formulate two models based on classical uncapacitated fixed-charge location problem under deterministic and stochastic cases. For a specific example, location decisions and the comparison of reliability under different location models are given. Extensive experiments verify that significant improvements in reliability can be attained simply by increasing the amount of operating cost.

Applications of an HIDS Theorem to the Existence of Fixed Point, Abstract Equilibria and Optimization Problems
Wei-Shih Du
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/247236
Abstract: By applying hybrid inclusion and disclusion systems (HIDS), we establish several vectorial variants of system of Ekeland's variational principle on topological vector spaces, some existence theorems of system of parametric vectorial quasi-equilibrium problem, and an existence theorem of system of the Stampacchia-type vectorial equilibrium problem. As an application, a vectorial minimization theorem is also given. Moreover, we discuss some equivalence relations between our vectorial variant of Ekeland's variational principle, common fixed point theorem, and maximal element theorem.
On Approximate Coincidence Point Properties and Their Applications to Fixed Point Theory
Wei-Shih Du
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/302830
Abstract: We first establish some existence results concerning approximate coincidence point properties and approximate fixed point properties for various types of nonlinear contractive maps in the setting of cone metric spaces and general metric spaces. From these results, we present some new coincidence point and fixed point theorems which generalize Berinde-Berinde's fixed point theorem, Mizoguchi-Takahashi's fixed point theorem, and some well-known results in the literature.
The Existence of Cone Critical Point and Common Fixed Point with Applications
Wei-Shih Du
Journal of Applied Mathematics , 2011, DOI: 10.1155/2011/985797
Abstract: We first establish some new critical point theorems for nonlinear dynamical systems in cone metric spaces or usual metric spaces, and then we present some applications to generalizations of Danc?-Hegedüs-Medvegyev's principle and the existence theorem related with Ekeland's variational principle, Caristi's common fixed point theorem for multivalued maps, Takahashi's nonconvex minimization theorem, and common fuzzy fixed point theorem. We also obtain some fixed point theorems for weakly contractive maps in the setting of cone metric spaces and focus our research on the equivalence between scalar versions and vectorial versions of some results of fixed point and others. 1. Introduction In 1983, Danc? et al. [1] proved the following interesting existence theorem of critical point (or stationary point) for a nonlinear dynamical system. Danc?-Hegedüs-Medvegyev's Principle [1] Let be a complete metric space. Let be a multivalued map with nonempty values. Suppose that the following conditions are satisfied:(i)for each , we have , and is closed;(ii) , with implies ;(iii)for each and each , we have . Then there exists such that . Danc?-Hegedüs-Medvegyev's Principle has been popularly investigated and applied in various fields of applied mathematical analysis and nonlinear analysis, see, for example, [2, 3] and references therein. It is well known that the celebrated Ekeland's variational principle can be deduced by the detour of using Danc?-Hegedüs-Medvegyev's principle, and it is equivalent to the Caristi's fixed point theorem, to the Takahashi's nonconvex minimization theorem, to the drop theorem, and to the petal theorem. Many generalizations in various different directions of these results in metric (or quasi-metric) spaces and more general in topological vector spaces have been studied by several authors in the past; for detail, one can refer to [2–12]. Let be a topological vector space (t.v.s. for short) with its zero vector . A nonempty subset of is called a convex cone if and for . A convex cone is said to be pointed if . For a given proper, pointed, and convex cone in , we can define a partial ordering with respect to by will stand for and , while will stand for , where denotes the interior of . In the following, unless otherwise specified, we always assume that is a locally convex Hausdorff t.v.s. with its zero vector , a proper, closed, convex, and pointed cone in with , and a partial ordering with respect to . Denote by and the set of real numbers and the set of positive integers, respectively. Fixed point theory in -metric and -normed spaces was
New Existence Results and Generalizations for Coincidence Points and Fixed Points without Global Completeness
Wei-Shih Du
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/214230
Modeling Multimedia Synchronization using Petri Nets
Wei Liu,Yuyue Du
Information Technology Journal , 2009,
Abstract: In this study, Logical Time Interaction Petri Nets (LTIPN) were designed to describe multimedia synchronization based on the previous models. In the model, we introduce logical expressions which are used to describe passing value indeterminacy in an logical time Petri net to model multimedia synchronization. And all multimedia synchronization events including multimedia objects are expressed by transitions of Petri nets, while the previous models mostly use places of Petri nets to express multimedia objects. This study provides users simple and intuitive modeling approaches. Basic temporal relations between multimedia objects, multimedia synchronization strategies and user interactive operations can be represented simply and explicitly by the LTIPN.
MacWilliams Identities of Linear Codes over Ring Mnxs (R) with Respect to the Rosenbloom-Tsfasman Metric
Wei Du,Heqian Xu
Information Technology Journal , 2012,
Abstract: The Rosenbloom-Tsfasman metric (RT, or ρ, in short) is a non-Hamming metric and is a generalization of the usual Hamming metric, so the study of it is very significant from both a theoretical and a practical viewpoint. In this study, the definition of the exact complete ρ weight enumerator over Mnxs (R) is given, where, R = Fq+uFq+...+ut-1Fq and ut = 0 and a MacWilliams type identity with respect to this RT metric for the weight enumerator of linear codes over Mnxs (R) is proven which generalized previous results. At the end, using the identity, the MacWilliams identity with respect to the Hamming metric for the complete weight enumerator cweC (x0, x1, xu,..., x(q-1)+(q-1)u+...+(q-1)ut-1) of linear codes over finite chain ring R is derived too.
Critical Point Theorems for Nonlinear Dynamical Systems and Their Applications
Du Wei-Shih
Fixed Point Theory and Applications , 2010,
Abstract: We present some new critical point theorems for nonlinear dynamical systems which are generalizations of Danc -Hegedüs-Medvegyev's principle in uniform spaces and metric spaces by applying an abstract maximal element principle established by Lin and Du. We establish some generalizations of Ekeland's variational principle, Caristi's common fixed point theorem for multivalued maps, Takahashi's nonconvex minimization theorem, and common fuzzy fixed point theorem for -functions. Some applications to the existence theorems of nonconvex versions of variational inclusion and disclusion problems in metric spaces are also given.
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