共查询到19条相似文献,搜索用时 45 毫秒
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介绍了进化动力学的基本知识和研究现状,把表型特征引入种群动力学模型,进而推导出进化适应动力学模型;总结了如何建立适应度函数以及分析研究进化动力学行为的一般理论和方法,并列举实例,模拟分析验证前面所陈述的理论方法,模拟结果说明收获对生物进化产生重要影响,并有效解释了物种多样性。 相似文献
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企业竞争的进化博弈论与种群生态学模型 总被引:1,自引:0,他引:1
陈金波 《数学的实践与认识》2009,39(1)
企业竞争与生物种群之间的生存竞争存在很大的相似性.根据企业竞争的特点,应用进化博弈论及种群生态学有关理论,推导并建立了企业竞争的生态学模型,并对其进行了深入分析,指出了企业竞争所产生的四种可能的均衡结果,最后说明企业竞争的过程实际上就是发现优秀企业和新的生产知识的过程. 相似文献
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一个具有非线性接触率和种群动力学的传染病模型 总被引:2,自引:0,他引:2
本文研究了具有非线性接触率和易感类中具有Logistic增长的SI传染病模型的正不变集,平衡位置以及平衡位置的稳定性。 相似文献
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《数学的实践与认识》2019,(19)
为了解决仅含预算约束的投资组合优化模型,提出一种基于种群密度的多目标协同进化算法.算法采用种群竞争的策略自适应的产生不定规模的种群,避免了固定种群规模的缺点.在进化过程中每个种群都会参考自身的最优个体以及竞争种群对自身的影响,超级个体集合存储进化过程中产生的最优解,通过最优个体的引导使算法快速收敛至Pareto前沿.实验结果表明,与NSGA-2算法相比,提出的算法在稳定性和收敛性都有很好的表现,是一种有效的多目标进化算法. 相似文献
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为达成工业系统的可持续发展的目标,国家和地区政府分别制定关于提高能源使用效率、改善空气和水质量的政策,推进工业运行、能源消耗和污染物排放三者的协调发展已成为当务之急。本文以生态位态势理论为指导,界定工业生态位的内涵,提出工业生态位的层级划分和工业生态位进化能力的维度结构分析,从纵向和横向两个方面研究区域工业增长、能源消耗和环境容量的效率关系,并测算工业运行CRE效率指数对不同投入产出指标波动的敏感度系数,继而挖掘制约工业生态进化能力提升的关键性因素,为促进工业可持续协调发展和政府部门制定工业发展战略提供依据。 相似文献
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讨论了在污染的环境中具脉冲出生的单种群动力学模型,证明了系统的所有解是一致有界的.利用数学的分析方法,获得了系统种群灭绝的条件,也得到了系统的持久生存的条件.研究的结果为污染环境中实际生物资源管理提供了可靠的管理策略. 相似文献
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本文提出了一个具有时滞的周期非均匀单种营养基——双种微生物的竞争恒化器模型,利用半群理论, 获得了该模型解的存在唯一性. 进一步, 建立了该模型的竞争排斥原理, 给出了两竞争物种共存的充分条件. 相似文献
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Brian Ryals 《Journal of Difference Equations and Applications》2018,24(2):240-244
In prior work on the coupled 2D Ricker Map, a conjecture was made concerning an upper bound on parameters that would guarantee injectivity of the map in a certain region of the plane. This injective property was used to show global asymptotic stability of the coexistent fixed point. In this short note, we find an explicit formula for the optimum upper bounds. 相似文献
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Brian Ryals 《Journal of Difference Equations and Applications》2020,26(3):370-383
Coupled planar maps are often parameter dependent, with the stability of their fixed points depending on the values of the parameters chosen. As the magnitude of the eigenvalues is difficult to determine when the number of parameters is large, one commonly uses instead the Jury conditions for the Jacobian, but even this can present difficulties. In this paper, we will show a simpler sufficient criteria for local asymptotic stability that follows by comparing slopes of isoclines. 相似文献
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Based on the theoretical framework of adaptive dynamics, the evolution of the predator-prey model with functional response of group defense effect on the predator handling time, was investigated. Firstly, in view of the interaction of predator populations with interspecific competition, the evolutionary conditions for a single predator population to split into 2 populations with different strategies through evolutionary branching were given. Secondly, when the ecological equilibrium of the model is unstable and the system has a limit cycle, the population will have strong coexistence under large mutation, but this coexistence will be evolutionarily unstable. Finally, the conclusions for the model with Holling-Ⅱ type functional response were compared. The results indicate that, with a sufficiently large prey carrying capacity, group defense effects can evolutionarily lead to the extinction of predators. © 2023 Editorial Office of Applied Mathematics and Mechanics. All rights reserved. 相似文献
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Ryszard Rudnicki 《Journal of Difference Equations and Applications》2017,23(9):1529-1541
We consider a discrete time competition model. Populations compete for common limited resources but they have different fertilities and mortalities rates. We compare dynamical properties of this model with its continuous counterpart. We give sufficient conditions for competitive exclusion and the existence of periodic solutions related to the classical logistic, Beverton–Holt and Ricker models. 相似文献
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Stylianos Scarlatos 《Complexity》2016,21(Z1):437-439
The discrete Deffuant model and its alternatives is a family of stochastic spatial models for the dynamics of binary opinions on f issues. Another parameter is also incorporated that prevents interaction between two agents whenever their opinion profiles are at a Hamming distance greater than the confidence threshold θ. By numerical simulations, it was conjectured in (Adamopoulos and Scarlatos, Complexity 2012, 17, 43) that one‐dimensional models exhibit a phase transition at a critical value . We report on recent mathematical results on this problem that originates from the community of complex systems. © 2016 Wiley Periodicals, Inc. Complexity 21: 437–439, 2016 相似文献
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We consider a parametric model for the dynamics of an isolated population with sex structure which is realized as a system of ordinary differential equations with impulses. The birth rate in the population in this model is assumed to be of a discrete character and the appearance of new generation specimens occurs at fixed moments, while the death rate is of a continuous character. We examine dynamical regimes of the model; in particular, we show that cyclic and chaotic regimes may occur for some values of parameters. 相似文献
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Emily P. Meissen Kehinde R. Salau 《Journal of Difference Equations and Applications》2016,22(8):1114-1136
Motivated by models from evolutionary population dynamics, we study a general class of nonlinear difference equations called matrix models. Under the assumption that the projection matrix is non-negative and irreducible, we prove a theorem that establishes the global existence of a continuum with positive equilibria that bifurcates from an extinction equilibrium at a value of a model parameter at which the extinction equilibrium destabilizes. We give criteria for the global shape of the continuum, including local direction of bifurcation and its relationship to the local stability of the bifurcating positive equilibria. We discuss a relationship between backward bifurcations and Allee effects. Illustrative examples are given. 相似文献
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This paper infers from a generalized Picone identity the uniqueness of the stable positive solution for a class of semilinear equations of superlinear indefinite type, as well as the uniqueness and global attractivity of the coexistence state in two generalized diffusive prototypes of the symbiotic and competing species models of Lotka–Volterra. The optimality of these uniqueness theorems reveals the tremendous strength of the Picone identity. 相似文献
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虚拟科技创新团队知识转移稳定性研究——基于演化博弈视角 总被引:1,自引:0,他引:1
虚拟科技创新团队作为一种优势资源的有效整合机制和从事创新性工作的知识密集型组织,知识的有效转移和持续流动是其成功的关键。本文运用演化博弈论的方法,将转移效应、制度因素、成本损失等影响知识转移的主要因素作为研究问题的关注角度,以知识转移效用函数为切入点,对虚拟科技创新团队知识转移的条件进行分析,系统研究了团队内部知识转移的稳定性、持续性以及演化趋势,并在此基础上提出了改善虚拟科技创新团队知识转移的对策建议。 相似文献

