基于微分博弈的乳制品供应链质量管理研究

考虑到合理的成本分担及公平的利润分配是影响乳制品供应链系统稳定及乳制品质量保证的重要环节,本文以一个乳制品加工企业、一个奶农(牧场)和一个零售商所构成的三级供应链为研究对象,引入微分博弈的方法,研究在4种不同的乳制品质量管理博弈情形下,乳制品供应链上各成员企业愿意为质量管理工作付出的努力及其收益.研究结果表明,乳制品加工企业的质量控制和质量改进两种工作的努力程度在3种非合作质量管理博弈情形下具有相同的表现,而在合作质量管理博弈情形下,为了供应链整体利益考虑,核心企业即乳制品加工企业的质量管理工作努力程度发生了变化.而对于乳制品供应链上游的奶农和下游的零售商而言,二者对于质量管理工作的努力程度随着乳制品供应链合作的深化而不断提高,在理想的合作博弈情形下达到了最高.     

差序氛围感知如何影响员工知识破坏行为：一个被调节的双中介模型

中国组织情境中的差序氛围会对员工知识行为形成潜移默化的影响。基于社会信息加工理论和归因理论,采用Boostrap、结构方程模型等方法对两个时点的699份问卷进行实证分析,探讨在中国文化情境下员工差序氛围感知与知识破坏之间的相关性以及存在的被调节的双重中介作用。研究结果表明,差序氛围感知与知识破坏负相关;内部人身份认知、职场妒忌分别在差序氛围感知与知识破坏之间发挥中介作用,并且恶意归因会增强差序氛围感知对内部人身份认知的负面影响与职场妒忌的正面影响,同时,增强差序氛围感知通过内部人身份认知、职场妒忌的中介作用进而对知识破坏的影响。上述发现有利于了解氛围感知影响员工知识破坏行为的内在机理,启示管理者采取针对性行为与措施,促进组织内部知识资源流动。     

基于成本控制的工程项目划分

根据建筑工程项目成本控制管理和工程预算定额计价模式,运用遗传全局优化计算方法,分析了基于成本优化控制下的工程项目划分的可操作性。依据问卷调查资料,获取优化计算参数,并综合计算得到了建筑工程分部工程的划分,重点为基础工程、梁柱工程、墙体工程、土石方工程、屋盖工程等工程实施项目,这种划分方法对建筑工程建设与管理提供一定的借鉴。     

标准地土地供应模式对城市绿色全要素生产率的影响效果及作用机制研究——基于PSM-DID的经验证据

研究目的：探究标准地土地供应模式对城市绿色全要素生产率的影响效果及作用机制，为推动经济高质量发展建言献策。研究方法：PSM-DID，中介效应模型。研究结果：（1）标准地土地供应模式的实施显著促进了城市绿色全要素生产率的提升。（2）从机制分析来看，工业结构优化和创新水平提升是标准地土地供应模式助力城市绿色全要素生产率提升的重要作用路径。相较于创新水平提升，工业结构优化在标准地土地出让模式影响城市绿色全要素生产率的过程中发挥着更加重要的中介作用。研究结论：地方政府应结合自身发展目标和现状，通过持续推行标准地土地供应模式，引导工业结构优化转型、鼓励内部技术创新和外部先进技术引进等措施促进城市绿色全要素生产率提升，助力经济高质量发展。     

Institutional stakeholdings and better-informed traders at earnings announcements

Utama and Cready [Utama, S., Cready, W.M., 1997. Institutional ownership, differential predisclosure precision and trading volume at announcement dates. Journal of Accounting and Economics 24, 129–150] use total institutional ownership to proxy for the proportion of better-informed traders, an important determinant of trading around earnings announcements. We argue that institutions holding small stakes cannot justify the fixed cost of developing private predisclosure information. Also, institutions with large stakes generally do not trade around earnings announcements since they are dedicated investors or face regulations that make informed trading difficult. However, institutions holding medium stakes have incentives to develop private predisclosure information and trade on it; we show that their ownership is a finer proxy for the proportion of better-informed traders at earnings announcements.     

Influence of equal or unequal comparison group sample sizes on the detection of differential item functioning using the Mantel–Haenszel and logistic regression techniques

In recent decades several methods have been developed for detecting differential item functioning (DIF), and many studies have aimed to identify both the conditions under which items may or may not be adequate and the factors which affect their power and Type I error. This paper describes a Monte Carlo experiment that was carried out in order to analyse the effect of reference group sample size, focal group sample size and the interaction of the two on the power and Type I error of the Mantel–Haenszel (MH) and Logistic regression (LR) procedures. The data were generated using a three-parameter logistic model, the design was fully-crossed factorial with 12 experimental conditions arising from the crossing of the two main factors, and the dependent variables were power and the rate of false positives calculated across 100 replications. The results enabled the significant factors to be identified and the two statistics to be compared. Practical recommendations are made regarding use of the procedures by psychologists interested in the development and analysis of psychological tests.     

Double knock-out Asian barrier options which widen or contract as they approach maturity

Barrier options are considered for Asian options using a differential equation method. Solutions are obtained in the form of Fourier series for barriers which expand or contract as they approach maturity. Rigorous bounds are obtained. It is shown that by differentiating with respect to a parameter, solutions for more general payoffs can be obtained.     

网络商业团购中介的拍卖主题控制模型研究

以网络团购中的商业团购经济活动为研究对象,叙述了商业团购中介在组织团购活动中的各个流程及涉及的要素,分析了中介方在设置团购主题时对团购拍卖标的选择的主要影响因子.在中介方的角度上以净收益最大为目标,设计了团购标的商品选择机制的离散控制模型,利用该模型分析了团购中介在团购主题设置时可采取的策略与控制手段.     

构建我国差异化半强制性农业保险制度的探索

农业是我国的基础产业,农业生产的安全性和稳定性是国泰民安的基本保障.我国是一个自然灾害频发的国家,巨大灾害事故给农业生产造成严重的经济损失,农民因灾致贫返贫的实例屡见不鲜.而农业保险作为农业发展"保护伞"的作用却十分微弱.本文从我国农业保险现状出发,针对各地区自然经济条件的差异,提出了我国建立差异化半强制性农业保险制度...