Beijing, China
Beijing, China

Time filter

Source Type

Zhao H.,Chinese Association for Artificial Intelligence | You C.,Logistics Academy | Xiao W.,Logistics Academy
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

Based on the analysis of the current status and development of domestic and foreign information resource management and control platforms, we propose to apply cloud computing to the resource management and control platform in data centers. The application can enhance the utilization efficiency of information resources, facilitate information sharing, and improve the accuracy and intensity of information resource management and control. © Springer International Publishing Switzerland 2016.


Zhu Z.,Tsinghua University | Zhu Z.,Logistics Academy | Liu L.,Tsinghua University | Wang J.,Long Island University
Computers and Industrial Engineering | Year: 2012

China is in the process of building Strategic Petroleum Reserve (SPR) as a utility for its oil supply security. In this paper we develop a stochastic dynamic programming model to optimize China's stockpile policy with the objective of minimizing the discounted SPR policy costs over a finite time horizon. It is shown that a deterministic and Markovian policy is optimal to the model. A recursive procedure is designed to construct the value functions and derive the optimal stockpile acquisition and release rates over time. Post-optimality analysis is performed to investigate sensitivities of the optimal policy to primary parameter assumptions. © 2011 Elsevier Ltd. All rights reserved.


Xiong Y.,LEU | Zhou J.,LEU | He Q.,Logistics Academy
Chemical Engineering Transactions | Year: 2016

The present study investigated the oxidation kinetics of biodiesel stabilized with pyrogallol conducted at 110-150°C using the PetroOXY method. It was demonstrated that the induction period increased with the increasing concentration and decreased with increasing temperature. The natural logarithm of antioxidant concentration varied linearly with respect to induction period, and the consumption of pyrogallol during the induction period followed the pseudo-first-order reaction kinetics over the temperature range studied. An increasing rate of consumption could be observed as temperature increased. Based on the Arrhenius equation, the activation energy for pyrogallol consumption could be calculated, which is different from the apparent activation energy for inhibited oxidation process. The introduction of pyrogallol into biodiesel could possibly lead to a change in the mechanism of oxidation process, due to the possible participation of antioxidant molecules in side reactions other than the main reaction of chain termination. Copyright © 2016, AIDIC Servizi S.r.l.


Cai Y.,The Academy of Management | Zhu J.,The Academy of Management | Li T.,Logistics Academy
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2015

Hot point recognition algorithm is designed in this paper. It is used to work out recognition of hot point in some encrypt wireless network based on OSPF protocol. We use traffic relevance to descript the character of hot point area. We recognize the area of hot point by means of calculating covariance of different reconnaissance nodes flux. Then we design the hot point recognition algorithm. Simulation results got in the NS2 show that this algorithm is well performed in hot point recognition. © 2014 IEEE.


Zhao H.,Chinese Association for Artificial Intelligence | Zhang H.,Logistics Academy | Zhang P.,Logistics Academy | Xiao W.,Logistics Academy
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

Based on the analysis of the development of online teaching, this paper proposes the overall conception of online teaching application platform based on cloud computing, describes the basic framework of the platform, and introduces the main tasks of the platform. In addition, an in-depth analysis is given on the construction of cloud data center, cloud storage platform, search engine and search navigation for teaching resources, online teaching management as well as management service cloud platform. Several key issues in the construction of the platform are also discussed. © Springer International Publishing Switzerland 2016.


Hou L.,Logistics Academy | Hou L.,University of Western Australia | Small M.,University of Western Australia | Lao S.,National University of Defense Technology
Entropy | Year: 2015

Several methods exist to construct complex networks from time series. In general, these methods claim to construct complex networks that preserve certain properties of the underlying dynamical system, and hence, they mark new ways of accessing quantitative indicators based on that dynamics. In this paper, we test this assertion by developing an algorithm to realize dynamical systems from these complex networks in such a way that trajectories of these dynamical systems produce time series that preserve certain statistical properties of the original time series (and hence, also the underlying true dynamical system). Trajectories from these networks are constructed from only the information in the network and are shown to be statistically equivalent to the original time series. In the context of this algorithm, we are able to demonstrate that the so-called adaptive k-nearest neighbour algorithm for generating networks out-performs methods based on ε-ball recurrence plots. For such networks, and with a suitable choice of parameter values, which we provide, the time series generated by this method function as a new kind of nonlinear surrogate generation algorithm. With this approach, we are able to test whether the simulation dynamics built from a complex network capture the underlying structure of the original system; whether the complex network is an adequate model of the dynamics. © 2015 by the authors.


Wei Z.,Beijing Jiaotong University | Wang M.,Logistics Academy
Applied Mechanics and Materials | Year: 2012

The structural problem is the key and difficult point for the study of material composed of granules. In this paper, theory of full state function for material structure is put forward by examining the structural morphology of the material. The full state function of material structure reflects the structural properties of material. Thus it can also reflect the variations in of mechanical and geometric properties of material under external force, i.e. the constitutive relationship of material. The constitutive relationship established based on full state function is abbreviated as "full constitutive relationship", which considers the structural properties of material. The constitutive relationship not only can derive constitutive relationship which considers material structure, but also the constitutive relationship with the identical form as that in classical theory when material degenerates into typical ideal elastic-plastic material. The theoretical method proposed in this paper transforms dynamic analysis of structural evolution into state analysis. By associating granular scale with macroscopic scale, a foundation is laid for solving of the structural problems of material macroscopically. © (2012) Trans Tech Publications.


Wei Z.,Beijing Jiaotong University | Wang M.,Logistics Academy
Applied Mechanics and Materials | Year: 2012

Dynamic analysis of structure of rock-soil material is a difficulty in structure analysis of rock-soil material. Dynamic analysis referred here is equivalent to plasticity analysis in classical elasticity/plasticity theory. But, for the structure of rock-soil material, the granules form a structure in the form of network, which makes dynamic analysis especially complex. We attempt to simplify granular form in this study, and construct a Markov model of structural evolution of system according to finite connection modalities between granules. Connection modality distributions for each structural state are obtained using recursion technique. Next, depending on connection modality distribution, we obtain the mechanical and geometric parameters of the system, thus stiffness-strength-displacement relation can be established. This relation serves as the basis for building dynamic constitutive relationship for rock-soil material. Literature on relevant subjects has been rarely found so far, and our discussion is only a tentative exploration. © (2012) Trans Tech Publications, Switzerland.


Wei Z.H.,Logistics Academy | Wang M.S.,Beijing Jiaotong University | Zhang D.L.,Beijing Jiaotong University
Applied Mechanics and Materials | Year: 2014

Strength criteria for materials in the classical elastoplastic theory are formed mostly based on experiments and some assumptions [1, 2]. However, no concensus has been achieved though many strength models were put forward to explore the applicable material strength criteria previously. Even the influence of material structures on strength has not been realized. In this article, the tensile failure strength criterion, shear strength criterion and strength criterion of friction materials are explored on the basis of the model of material with a structure of uniformly random distribution. Through analysis, it can be discovered that the strength criteria in the classical elastoplastic theory can be derived from the complex material theory based on the concept of material structure. However, as the theoretical basis, conditions of derivation and assumptions of concepts are totally different, it is proved that the complex material theory used for studying the material structures can fully cover the contents and conclusions obtained in classical elastoplastic theory. © (2014) Trans Tech Publications, Switzerland.


Wei Z.,Beijing Jiaotong University | Wang M.,Logistics Academy
Advanced Materials Research | Year: 2012

The macroscopic static analysis of granule system performance in Literature [1] considered the position, direction and scale of the connection between granules in the system and other relevant physical properties. Taylor linear expansion was adopted to analyze the geometric displacement of the connection formed by granules. However, for the more complex granular connection in the form of network, the geometric position of granular connection in the statistical domain is linearly approximated, which may result in considerable calculation errors. In the complex network structure formed by granular connection, the displacement of connectors is discrete and discontinuous. In the presence of certain interactions among granular connections, there is the possibility to form spatial granular chain, with increased heterogeneity of deformation in the statistical domain. The accuracy of analysis will be affected if linear approximation is adopted. Shape parameter-based method proposed in this paper is a more universal method, which considers the influence of both the parameter of geometric location distribution of connectors and structural morphology of networks formed by granules. The core idea of this method is to introduce a corrected shape parameter vector for the non-linear part on the basis of linear approximation, to correct the displacement of connectors in geometric space so that the original linear analysis will better adapt to non-linear problems such as the network of connection formed by granules. © (2012) Trans Tech Publications, Switzerland.

Loading Logistics Academy collaborators
Loading Logistics Academy collaborators