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基于因子和聚类分析的县域经济发展研究——以河南省18个县(市)为例 总被引:7,自引:1,他引:6
建立县域经济发展评价指标体系,以河南省18个县(市)作为样本,运用因子分析方法进行实证分析,提取出综合经济实力因子、农业发展实力因子、生活质量因子、投资因子和第三产业发展因子5个主因子,并基于主因子得分矩阵对18个县(市)进行聚类分析.结果表明:反映经济发展整体水平和工业生产规模的综合经济实力因子处于主导地位,同时农业发展实力因子的作用也不可忽视.论文认为利用因子分析和聚类分析相结合的方法研究县域经济,所得结论客观、可信,能够较好地反映影响县域经济发展的主要因素. 相似文献
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基于调查就安徽民营科技企业薪酬激励的影响因素提出研究假设,并通过选择有效样本与变量做出数据统计和实证分析,以证实民营科技企业在薪酬激励的现状和效果方面有着较大的改进空间。最后从安徽省民营科技企业薪酬管理的实际出发,基于战略、制度等层面对薪酬激励的目标、水平及结构作出相关分析,并提出相关政策与建议。 相似文献
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本文将哈尔变换应用于旋转机械故障诊断之中,并提出了用于诊断的“脉冲锐度”指标.基于付立叶分析的频谱分析是目前广泛采用的方法,与快速付立叶变换相比,哈尔变换具有实时性,逼近效果好,适用于对脉冲的提取等优点.而不足之处是受样本始点选取及样本长的影响大.对此,本文提出了控制各次样本的等效性的方法,改善了哈尔谱的稳定性与比较性.最后,通过对滚珠轴承故障模拟试验台进行试验得到的结果证实了哈尔谱及脉冲锐度指标对故障的敏感性. 相似文献
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建立经济发展水平综合评价指标体系,以新疆14个地州市为样本,运用因子分析方法进行实证分析,提取出综合经济实力因子、工业发展因子和农业发展因子3个主因子,并基于主因子得分矩阵对14个地州市进行聚类分析,聚类分析将新疆各地州市分为三类,并在此基础上得出了一些重要的启示. 相似文献
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邓晶刘倩 《数学的实践与认识》2022,(11):108-121
采用基于DEA的SBM-ML法测算2009-2018年中国其中30个省的绿色全要素生产率,并用熵权TOPSIS法从创新基础,创新投入和创新产出三个维度综合评价了10年30个省的区域创新水平,并通过空间计量模型研究区域创新、财政分权对中国绿色全要素生产率的影响.研究表明:中国绿色全要素生产率水平呈现正向空间集聚特征且东部明显高于中西部,区域创新水平与绿色全要素生产率之间具有非线性关系,并呈倒“U”型分布,地方财政分权与绿色全要素生产率呈负向关系,财政分权对区域创新促进绿色全要素生产率的提高有明显的强化作用,此外,财政分权的作用效果受区域创新水平的影响,当区域创新水平较高时,财政分权对绿色全要素生产率将从抑制作用将转变为促进作用.最后基于结论提出建议. 相似文献
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随着产品生命周期缩短,产品更新换代加快,废旧产品的回收与处理已成为一个迫切的社会问题。基于企业的社会责任,本文研究逆向物流回收模式的选择问题。我们考虑生产商回收、零售商回收及第三方物流回收三种模式,在为各回收模式建立数学模型后对其进行了优化分析;最后以电子行业废旧产品的回收为例,通过算例分析,对考虑和不考虑企业社会责任的回收模式进行了比较,从而得出:当生产企业较少考虑到企业社会责任且政府奖励较低时,其会选择零售商回收模式;而当生产企业较多地考虑到企业社会责任且政府奖励较高时,其会选择自己回收的模式。这表明企业社会责任和合适的政府激励对促进生产商自己担负起废旧产品的回收工作有积极的意义。 相似文献
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We study a real-world problem arising from the operations of a hospital service provider, which we term the master physician scheduling problem. It is a planning problem of assigning physicians’ full range of day-to-day duties (including surgery, clinics, scopes, calls, administration) to the defined time slots/shifts over a time horizon, incorporating a large number of constraints and complex physician preferences. The goals are to satisfy as many physicians’ preferences and duty requirements as possible while ensuring optimum usage of available resources. We propose mathematical programming models that represent different variants of this problem. The models were tested on a real case from the Surgery Department of a local government hospital, as well as on randomly generated problem instances. The computational results are reported together with analysis on the optimal solutions obtained. For large-scale instances that could not be solved by the exact method, we propose a heuristic algorithm to generate good solutions. 相似文献
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考虑在政府的干涉措施下,讨论双渠道回收废旧品的闭环供应链管理模式问题。文章分别构建了无政府干涉下的独立决策模型、政府干涉下的独立决策模型和政府干涉下的合作决策模型;并且给出了相应模型的最优解。通过模型之间的比较分析,结合数值算例分析,得出结论:政府干涉下的合作决策模型是理想的闭环供应链管理模式,并给出相应的实现路径。而这种理想的管理模式的实现,需要有效的协调机制和有效的政府激励机制的合力。 相似文献
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We study an infinite-horizon sequential dynamic game where the players are a government and an international terrorist organization. We provide conditions for the existence of equilibria in which the terrorists’ resources are totally destroyed by a government’s strike. Specifically, we study strong eradication equilibria in which the government’s strike annihilates the terrorists’ resources, preventing the terrorists from acting. We also pay attention to weak eradication equilibria in which the terrorists’ resources are destroyed but in which the initial value of the terrorists’ strike is nevertheless positive. We also show the existence of an equilibrium in which war is perpetual between the government and the terrorists. Perpetual war can only coexist with weak eradication equilibria. For these cases, we provide conditions under which the government would be better off in a weak eradication equilibrium. 相似文献
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监管机制是否行之有效是决定机场能否长期安全运行的关键所在.针对机场安全运行监管现状,进一步挖掘机场与政府之间内在博弈机理,在引入机场按章运行与违章运行下发生不安全事件概率因子的基础上,构建了机场与政府之间的安全运行动态监管博弈模型,研究了二者在机场安全运行监管过程中博弈双方的策略选择问题.通过对模型混合策略纳什均衡进行... 相似文献
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针对中药材供给中的信息不对称性,建立了三个中药材供给方与政府稽查部门之间的三个不完全信息动态博弈模型,得到了相应的子博弈精炼贝叶斯均衡解的五个结论.这五个结论合理刻画了中药材供给方与政府稽查部门的博弈行为并揭示了非法采挖野生中药材现象难以杜绝的原因.结果表明,政府对稽查行为的条件激励措施并不能有效杜绝非法采挖野生中药材现象,只有政府对所有的稽查行为实施普遍的强激励机制才可从根本上消除非法采挖野生中药材的现象. 相似文献
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《Applied Mathematical Modelling》2001,25(7):579-592
The conduction transfer function (CTF) models of heat conduction through building constructions are widely used in building energy analysis and heating, ventilation, and air conditioning (HVAC) system design and simulation. A frequency-domain regression (FDR) method is developed to estimate the CTF model of a building construction from its theoretical response characteristics in this paper. First, the theoretical response characteristics are calculated simply by numerical matrix multiplication. The CTF coefficients are then obtained by simply solving a set of linear equations. The tests and comparisons have shown that CTF models obtained by the FDR method are completely equivalent to those found by the methods currently available. The FDR method can provide a short series of CTF coefficients, and the models by this method have a high accuracy in calculating heat gain/loss through building constructions. The FDR method is very simple and straightforward, has high computational speeds, and needs less computational efforts. Therefore, the FDR method is much easier and convenient to use and implement in building energy analysis and HVAC system simulation programs. 相似文献
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Information initiatives of mobile retailers: a regression analysis of zero‐truncated count data with underdispersion
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Our paper presents an empirical analysis of the association between firm attributes in electronic retailing and the adoption of information initiatives in mobile retailing. In our attempt to analyze the collected data, we find that the count of information initiatives exhibits underdispersion. Also, zero‐truncation arises from our study design. To tackle the two issues, we test four zero‐truncated (ZT) count data models—binomial, Poisson, Conway–Maxwell–Poisson, and Consul's generalized Poisson. We observe that the ZT Poisson model has a much inferior fit when compared with the other three models. Interestingly, even though the ZT binomial distribution is the only model that explicitly takes into account the finite range of our count variable, it is still outperformed by the other two Poisson mixtures that turn out to be good approximations. Further, despite the rising popularity of the Conway–Maxwell–Poisson distribution in recent literature, the ZT Consul's generalized Poisson distribution shows the best fit among all candidate models and suggests support for one hypothesis. Because underdispersion is rarely addressed in IT and electronic commerce research, our study aims to encourage empirical researchers to adopt a flexible regression model in order to make a robust assessment on the impact of explanatory variables. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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本文在用商品贸易权重计算有效汇率的基础上,探讨了用资本移动权重和债务权重计算有效汇率的新模型,并调查和实证分析了由这些模型决定的人民币有效汇率时序列运动以及它们与宏观经济变量之间的长期关系,以解决外汇管理中人民币升值压力上升问题。我们得出:在我国,基于贸易权重的实际有效汇率与基于债务权重的人民币实际有效汇率有较高的相关性,但基于贸易权重的与基于资本移动权重的没有相关性的结论。因此,我们认为在人民币升值压力较大时,货币当局可以用调整我国对外债务结构来替代词整对外贸易差额。 相似文献