Research on web forum oriented rumors spreading and inhibitions北大核心CSCD

A rumor spreading model for the web forum based on the heterogeneity of web forum user behaviors and SEIR model is proposed in this paper. First, according to the mean-field equations of the model on inhomogeneous networks, the critical threshold of the spreading of rumor is deduced, the result of theoretical analysis shows that the increase in trust mechanism between users can effectively inhibit the rumor spread in the network with limited velocity of propagation; Then the simulation and numerical analysis of the model itself and the influences of trust mechanism to the model is given, which verify the validity of the model and the introduction of trust mechanism can effectively reduce the rumor influence, the velocity of rumor spreading and the rumor size; Finally, combined with the previous conclusions and the high-influence limited trust relationships between web forum users, a high-influence immunization strategy is given. The experimental results show that the strategy able to reach better effect than traditional immunization strategy. © 2016, The Journal of Agency of Complex Systems and Complexity Science. All right reserved.     

Impact of random bandwidth allocation on transimission of complex networks北大核心CSCD

This research studies the impact of random bandwidth allocation on complex network transmission under the condition of limited bandwidth resources. Two types of heterogeneous random bandwidth allocation strategies are designed and a series of simulation tests are conducted within HK-BA network. The result reveals that the completely random bandwidth allocation has an uncertain influence on network load. Meanwhile, comparing to the shortest routing strategy, the G-L routing strategy has a better robustness in network load performance with the random bandwidth allocation. In addition, the network load capacity can be effectively improved by using the classification random bandwidth allocation with the reasonable combination of the edge weight and bandwidth in complex networks of betweenness heterogeneity. ©, 2015, The Journal Agency of Complex Systems and Complexity Science. All right reserved.     

Exploration and Study on Similarity Theory

This paper introduces the similarity theory as the theoretical foundation of system simulation. The concepts of similarity theory, similarity styles and similarity methods are discussed.     

Micro-mechanism and Dynamic Simulation of Spatial Agglomeration and Knowledge Spillover北大核心CSCD

According to the study of “new” new economic geography, there are three “black boxes” in terms of the setting of firm productivity, the mechanism of knowledge spillover between firms, and the sources of the increase in agglomerated areas’ productivity. Based on the ideas and methods of Complexity and Agent-based Computational Economics, we use Genetic Algorithms to encode firms’ knowledge structure and develop an agent-based spatial economic evolution simulation platform to simulate the process of firms’ productivity improvement and spatial agglomeration through knowledge spillover and innovation. Simulation experiments demonstrate that the knowledge spillover leads to dynamic heterogeneity of firms, and the flow of firms between regions is progressive and bidirectional. Then, in the early stage of the spatial agglomeration process, the increase in regional productivity is due to the “pull-up effect” formed by the entry of high-efficiency firms and the combined effect of knowledge spillover, while in the later stage of the agglomeration process, the increase in regional productivity is mainly due to local knowledge spillover and the “pull-down effect” of the entry of low-efficiency firms. © 2023 Editorial Borad of Complex Systems and Complexity Science. All rights reserved.     

Command and control model based on complex information relation integration北大核心CSCD

In order to describe collaborative decision-making process, the command and control model is put forward based on complex information relation integrtion and OODA. The characteristics of individual decision-making are analyzed, the complex information relation is considered as the cause of OODA difficulty to describe collaborative decision-making exactly. From the perspective of armament system of systems combat, the information, data, intelligence and knowledge is defined based on knowledge management and Shannon's entropy theory. The basic element is confirmed and the information flow way is analyzed which in the physical, information, cognitive and social domains. From the perspective of information, the armament system of systems complex networks model framework is put forward based on the idea of using OODA to guide armament system of systems complex networks model design. The data, information, intelligence and knowledge flow is analyzed and the describing meta-model is put forward. Using the reticular structure of OODA to describe collaborative decision-making idea is proposed, the command and control model is put forward based on the idea, the simulating tool ExtendSim is used for simulation analysis and results show that our work offer a reference for innovate command and control thory. ©, 2015, The Journal Agency of Complex Systems and Complexity Science. All right reserved.     

Systemic Risk Contagion of Interbank Network Based on Risk-Averse Behaviors北大核心CSCD

We build an interbank network model based on risk-averse behaviors. On a heterogeneous network structure, we explore the relationship between risk-averse behaviors of banks and systemic risk contagion, specifically, liquidity hoarding, fire sales behaviors and the composition of risk-averse behaviors. The simulation results show that liquidity hoarding behaviors mitigate systemic risk contagion at early stage, fire sales behaviors have little effect on mitigating systemic risk contagion and the composition of risk-averse behaviors exacerbate the systemic risk contagion. Heterogeneous network is more robust than the homogenous network if risk-averse behaviors exist, otherwise the homogeneous network is more stable. Furthermore, bank asset heterogeneity has no significant effect on systemic risk contagion. © 2017, The Journal of Agency of Complex Systems and Complexity Science. All right reserved.     

Research on the integration of Web_-CNC and EIS

1.INTRODUCTION Withthedevelopmentofcomputerandnetwork,the competitionofmarketbecomingincreasinglyserious,andtherequirementofcustomerschangingfaster,enterprisecannotadaptitselftothemarketdemand withthetraditionalmanagingmode.Inordertosuc ceedinmarket,enterprisemustreacttothemarket agilely,andmustbuildnetworkedmanufacturing modebasedontheT(time),Q(quality),C(cost),S(service),E(environment),andK(knowl edge)[1,2].Atpresent,enterprisestrengthenstheagility throughimplementingERP(enterprisere…     

Hopf bifurcation analysis and bifurcation control of a lorenz-like system北大核心CSCD

Hopf bifurcation behavior and bifurcation control of a new Lorenz-like system are studied in this paper. Firstly, Hopf bifurcation type is determined by bifurcation stability norm. Then the linear controller and the non-linear controller are applied to control the original system respectively. In the section of linear control, the effect of linear parameter on the position of Hopf bifurcation is discussed by Routh-Hurwitz criterion; In the section of non-linear control, the Hopf bifurcation Normal Form of controlled system is obtained by using direct Normal Form method, and the effects of nonlinear parameter on amplitude of limit cycle and Hopf bifurcation type are discussed by coefficient of Normal Form. Discussions show that if non-linear parameter satisfies certain condition, bifurcation type of original system will be changed, and the periodic solution amplitude will increase with the parameter increasing. ©, 2015, The Journal Agency of Complex Systems and Complexity Science. All right reserved.     

A New Convergence Result of Gauss－Newton Methods for the Complementarity Problem

1　 IntroductionL et F∶Rn→Rnbe continuously differentiable.The nonlinear complementarity problem isto find a solution of the following system of equations and inequalities:x 0 ,F( x) 0 ,x TF( x) =0or,equivalently,xi 0 ,Fi( x) 0 ,xi Fi( x) =0 ,　 i =1,… ,nWe denote this problem by NCP( F) .When F is an affine function and is of the formF( x) =Mx qM is an n× n real matrix and q∈ Rn,the complementarity problem is referred to as thelinear complementarity,denoted by L CP( M,q) .N…     

The robustness of high-speed railway and civil aviation compound network based on the complex network theory北大核心CSCD

The topological characteristics and robustness of Chinese high-speed railway and civil aviation compound network are analyzed based on the complex network theory. The results include the following points: the high-speed railway and civil aviation compound network and its two subnetworks are scale-free and small-world networks; the robustness of high-speed railway and civil aviation compound network is better under the random attack than under the calculated attack; the robustness of compound network is better than its two subnetworks, whether under the random attack or under the calculated attack. ©, 2015, The Journal Agency of Complex Systems and Complexity Science. All right reserved.     

Cascading failure of complex networks based on load local preferential redistribution rule北大核心CSCD

To better explore the universal robustness against cascading failures on complex networks, closely focusing on the load which is the most important physical quantity that can affect the spread of cascading failure, and dynamic process after a node fails, a cascading failure model with tunable parameters is proposed based on the local characteristic of node. With this model we study the cascading failure condition of ER and BA networks, and obtain the formula of phase transition point theoretically. The relationship between the robustness against cascading failures on complex networks and parameters in the model, including the topology parameters, the initial load coefficient, and the redistribution coefficient, is discussed numerically. In addition, theoretical results also are verified by the simulation results of the ER and BA networks. ©, 2015, The Journal Agency of Complex Systems and Complexity Science. All right reserved.     

Chaotic Behavior of a Generalized Hamiltonian System and Its Circuit Implementation北大核心CSCD

A kind of generalized Hamiltonian systems with dissipative structure and external input is proposed. By configuring its structure matrix and external input, a simpler three-dimensional dynamical system with only one fixed point is designed to illustrate the existence of chaos. Useful tools, including phase portrait, Poincaré section, Lyapunov exponents, bifurcation diagram and power spectrum, are used for detecting chaotic behavior of the proposed system with the enhancement of DC input. Compared with the known three-dimensional chaotic systems, the proposed system has the following two characteristics: Its dissipativity is related to system state variables and its Lyapunov dimension is closer to 3. Finally, a circuit implementation of the new system is presented and the results recorded on an analogue oscilloscope further verify the existence of chaotic behavior. © 2017, The Journal of Agency of Complex Systems and Complexity Science. All right reserved.     

Numerical Simulation of the COVID-19 Herd Immunity Based on Complex Network Modeling北大核心CSCD

鉴于构建流行病动力学模型、探索流行病传播规律对疫情防控具有十分重要的理论意义和实际应用价值,在已有的均匀混合模型基础上,针对个体接触关系异质化越发明显,且每个个体都处在不同的接触关系中,建立了兼顾个体状态与接触追踪的动态小世界网络模型。模拟了新冠病毒在社会中的传播过程。通过对比仿真结果,说明了所建模型的合理性。在此基础上,仿真计算了网络拓扑结构与接种免疫人数占比共同作用下对新冠病毒传播的影响,分析得到群体免疫临界值。说明所建传播模型合理,接种疫苗实现群体免疫可行。     

Research on assessment system of accomplishment

1 .INTRODUCTIONIt is a thorny problemfor people to establish theobjective systems for the indiviolual ,the colony ,the leadership and organization, to build the as-sessment systemof accomplishment for theindivid-ual andthe colony ,andthe allotting systemfor theindividual and the colony , which are being fol-lowed with interest by the administrators and thepolicymakers all along in the course of the projectmanagement .A scientific and fair-minded assessment sys-temis the key to fulfilling t…     

Agent-based modeling and analysis of influenza transmission-illustrated by hong kong influenza transmission patterns北大核心CSCD

The reasons why there are summer transmission peaks in tropical area and subtropical area in east Asia are still unclear. This paper uses an agent-based modeling (ABM), to model influenza transmission dynamics. Our influenza transmission ABM model considers two transmission routes and the model is illustrated by the analysis of Hong Kong influenza transmission pattern. Results show that: 1) the summer peak of influenza transmission in Hong Kong can be caused by virus transmission through the fomite-mediated route; 2) under the seasonality influence of the absolute humidity, aerosol route and fomite-mediated route dominant transmission in winter and summer repectively; 3) two routes transmission model can be better used for influenza transmission control for different seasons. ©, 2015, The Journal Agency of Complex Systems and Complexity Science. All right reserved.     

A Topic Text Network Construction Method Based on PL-LDA Model北大核心CSCD

Labeled LDA can mine words' probabilities under a given topic, however, it can't analyze the association relationships among these topic words. Although the correlation between word pairs can be calculated by utilizing PMI (Pointwise Mutual Information), their relationship to the given topic is lost. Motivated by the operation of counting word pairs in a fixed window used in PMI, this paper proposes a topic model called PL-LDA (Pointwise Labeled LDA), which can compute the joint probabilities between word pairs under a given topic. Experimental results on aviation safety reports show that this model achieves results with good interpretability. Based on the results of PL-LDA, this paper constructs a topic text network, which provides rich and effective information for analyzers including reflecting the distribution of topic words and displaying the complex relationships among them. © 2017, The Journal of Agency of Complex Systems and Complexity Science. All right reserved.     

Research on Positive and Negative Effects of the Enterprisers Debts Operation

This paper discusses debt run‘s credit risk, analyses its finance lever‘s positive and negative effects, give a benefit conclusion and suggestion.     

Research and design on a kind of CASE environment architectural style based on ToolBus

1.INTRODUCTION CASEenvironment,whichencompassesasetoftool suitesandtoolintegrationframeworks,isakindof complexsystemsoftware.It’sthemajorchallenges totheCASEenvironmenttosupporttheopenness distributionandteamworkbasedontheInternet SimilartosoftwarearchitectureofOS(operatingsys tem),softwarearchitectureofcurrentCASEenvi ronmentalsocanbedividedintothreetypes:mono lithic,layeredandToolBusstructures. Untilnow,mostCASEenvironmentshavebeen implementedinmonolithicorlayeredstructure…     

Some Concepts and Mathematical Consideration of Similarity System Theory

This paper introduces a new discipline called Similarity System Theory. Some new concepts, such as Similar Elements, Similarity Unit, Similar Systems and Similarity Entropy are presented. The numerical method and dynamic analysis of similarity system theory are studied.     

A Mathematical Model of Real-Time Simulation and the Convergence Analysis on Real-Time Runge-Kutta Algorithms

In this paper, a mathematical model of real-time simulation is given, and the problem of convergence on real-time Runge-Kutta algorithms is analysed. At last a theorem on the relation between the order of compensation and the convergent order of real-time algorithm is proved.