非合作博弈下网络外卖平台竞争策略研究

随着网络餐饮外卖服务的发展,网络外卖平台的竞争越来越激烈,如何在网络外卖平台中处于竞争优势,受到当前该领域学者与投资者的广泛关注。本文通过构建网络外卖平台非合作博弈模型,针对完全信息博弈和不完全信息博弈两种情形,对移动餐饮市场中企业A和企业B双方的竞争策略进行分析。研究结果表明,博弈参与者采取何种行动策略由其资金实力与信息决定。     

非对称鹰鸽博弈均衡解稳定性及其应用

鹰鸽博弈模型是刻画动物世界或人类社会竞争与冲突等行为决策的经典模型.考虑博弈双方实力差距对均衡解的影响问题,构建一个新的支付矩阵.运用演化博弈理论研究发现：鹰鸽博弈Nash均衡解的存在性与稳定性由参与双方的实力差距、成本收益率和博弈初始状态组合等因素之间的相依关系决定.由此揭示了人类社会面对竞争与冲突时的“人为财死,鸟为食亡”自然现象,以及人类社会理性人的“量力而行”与“见机行事”等行为特征,并给出了如何“量力”与如何“见机”的决策模型和判断依据.     

确定性随机竞争系统的竞争力演化及其分布

利用复杂系统结构分析的方法,研究了一类确定性系统的一般随机竞争演化模型.研究发现,系统中节点的竞争力将随系统演化时间而呈指数变动,并根据节点竞争力随机增长的出现概率而存在3种不同长期趋势,且短期中系统节点的竞争力分布保持基本形态不变;同时,系统将在长期中出现竞争态势不变、均匀竞争与崩溃3种可能的状态.该模型有助于解释与预测各类无退出机制的竞争系统的演化过程与状态特征.     

江苏省体能主导类项群竞技实力研究

以江苏省在近三届全运会上体能主导类项群运动成绩为研究单位,分析了江苏省竞技实力的发展与奖牌变化特征,探讨了江苏省所处的竞技战略地位和竞技项目群体发展趋势。研究表明:江苏省体能主导类项群竞技实力整体呈上升趋势,并形成了以速度性项群为主导,快速力量性项群为中坚力量和耐力项群居中的发展格局;奖牌数量呈递增趋势,在第十届全运会上个别项目出现了"假优势"现象;整体竞技实力在六省市中处于中下位置,项目发展存在较大的竞争压力;项目群体呈现偏态发展趋势。由此,在保障速度性项目竞技实力发展,稳固快速力量性项目和提高耐力性项目发展的竞技基础上,合理调控竞技群体发展结构是保证其整体竞技实力健康发展的前提。同时,还要借鉴其他省市经验、教训及相关理念等促进其更好更快发展。     

随机环境中的泊松过程

引进了随机环境中的泊松过程模型,推导出其转移概率,讨论了该过程与均匀分布和Γ分布之间的特殊关系,证明了当环境过程为坐标过程时随机环境中泊松过程是一类特殊的随机环境中马氏过程,并给出了该过程的随机Kolmogorov方程.     

基于条件增强随机蕨的果园苹果检测

在农业果实自动化采摘过程中,果实检测易受光照、尺度变换等影响导致算法缺乏泛化性.针对这些问题,本文提出了一种基于条件增强随机蕨(conditional boosted random ferns, CBRFs)的果园苹果检测方法.首先,基于面向HOG(histogram of oriented gradients)特征域的增强随机蕨分类器(boosted random ferns,BRFs),在选取特征时限制特征方向区间选择的随机性;其次,改变分类器的二进制特征产生方式,以避免从图像平坦区域中随机选取的特征出现误分类的情况;最后,在自制苹果检测数据集上进行分类器训练,构建条件增强随机蕨分类器,使其适应于果实重叠、枝叶遮挡和光照不均等复杂环境下的果园苹果检测.在测试集上的验证结果表明,F1值与原增强随机蕨模型相比提高了5.44%,这说明本文所提方法能有效增强果园中苹果的检测效果.     

随机环境中的广义生灭过程的常返性

建立了连续时间的随机环境中的广义生灭过程（ＧＢＤＰＲＥ）模型,通过差分方程的计算,先得到固定环境的广义生灭过程（ＧＢＤＰ）的常返性,进而将环境随机化,得到随机环境中的广义生灭过程常返性的一个充分条件．     

一个基于两层CES效用函数的垄断竞争模型

Dixit-Stiglitz模型提供了一个易于处理的垄断竞争分析框架,但其对称性假设降低了模型的解释力;产品特征法模型虽然解决了不对性问题,但在实际应用中却很难处理．通过构建一个由两层CES函数组成的效用函数,建立了一个具有不对性特点的垄断竞争模型,并利用模型分析了出境旅游的发展对国内旅游的影响．     

建筑空调系统能耗监测动态分析模型与优化控制方法

针对大型建筑空调系统能耗监测与能效优化控制问题,通过分析建筑物与外界环境的能量交换、室内温变过程的动态特征和变化机理,考虑随机不确定性因素的影响,建立了以温度、湿度等为变量的建筑物空调能耗过程随机动态模型,分析了建筑物空调能耗与室内外环境热交换的平衡制约关系.以建筑物舒适度指标作为能耗控制目标,建立空调能耗最小的优化控制模型,分析了系统优化途径;根据建筑物实际监测数据,应用动态回归方法探讨了如何确定建筑空调能耗模型的结构与参数,通过实际数据分析与模拟仿真结果的比较验证了模型的正确性.     

基于"钻石模型"的资源富集地区县域经济竞争力提升的分析——以山西盂县为例

波特提出的钻石模型解释了如何将比较优势转化为竞争优势的问题,提供了提升县域经济竞争力的思路,为竞争经济环境下的政府进行宏观经济决策奠定了基础。面对机会与挑战并存的局面,盂县必须将良好的资源优势转化为竞争优势,加强相关支持性产业的发展,搞好县域的合作与竞争,进一步提升经济实力。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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