用Kantorovich算子的迭代布尔和逼近连续函数

构造了一类Kantorovich算子的迭代布尔和,然后给出了用它逼近连续函数时的正定理、逆定理和非饱和逼近阶的特征刻划.     

影响港口经营人法律地位的因素研究

港口经营人法律地位涉及的内容较为复杂,并且一直是海商法理论和实务中的热点、难点问题。通过选取全新角度,着眼于微观层面,深入研究影响港口经营人法律地位的相关因素,并具体分析港口经营现状、港口作业合同、租船运输方式、运输条款等与港口经营人法律地位的关系,可以切实论证港口经营人法律地位的非单一性。     

Applied Nonparametric Instrumental Variables Estimation

Instrumental variables are widely used in applied econometrics to achieve identification and carry out estimation and inference in models that contain endogenous explanatory variables. In most applications, the function of interest (e.g., an Engel curve or demand function) is assumed to be known up to finitely many parameters (e.g., a linear model), and instrumental variables are used to identify and estimate these parameters. However, linear and other finite‐dimensional parametric models make strong assumptions about the population being modeled that are rarely if ever justified by economic theory or other a priori reasoning and can lead to seriously erroneous conclusions if they are incorrect. This paper explores what can be learned when the function of interest is identified through an instrumental variable but is not assumed to be known up to finitely many parameters. The paper explains the differences between parametric and nonparametric estimators that are important for applied research, describes an easily implemented nonparametric instrumental variables estimator, and presents empirical examples in which nonparametric methods lead to substantive conclusions that are quite different from those obtained using standard, parametric estimators.     

城镇化融资方案选择研究

城镇化融资方案选择是推进城镇化发展的重要内容。基于模糊偏好关系基本理论和方法,根据群决策的方法和流程,将模糊集结算子引入到城镇化融资方案选择的环节中,提出了新的城镇化融资方案选择方法,并对天津市大港区某一园区开发建设融资方案选择进行了实证研究。结果表明:新的城镇化融资方案选择方法简单易行,具有较强的科学性和适用性。     

Cannvy边缘检测算子研究及其在医学图像中的应用

为了进一步加强数字图像处理技术在医学图像领域的应用,分析基于Canny算子的边缘检测方法并将其应用于医学图像。本文首先介绍边缘检测算法的理论基础;然后结合Canny算子的实现原理及步骤,说明边缘检测所遵循的基本原则;最后在OpenCV环境下编程调试,对该算法进行实验验证,利用Canny算子对一幅人体肺部CT图像进行边缘提取。对实验结果进行分析得出结论,Canny算子检测出的边缘完整、连续且细锐。从实验结果中可以看出,这种方法对医用CT图像的边缘检测非常适用,对于利用计算机进行医学图像处理有着重要的现实意义。     

移动服务供应链的收益分配机制研究

移动商务价值链上的企业众多,确定合理的利润分享机制有利于整个价值链的协调发展.为此,以移动增值服务为对象,对移动运营商和内容/服务提供商的协调机制进行了研究,构建了一个二级供应链优化模型并对其进行了分析.研究表明,在一定条件下,该模型所提出的策略能实现移动商务价值链的主干链上成员利润最大化及协调.最后,通过一个算例验证了模型的有效性.     

Existence and Uniqueness of a Fixed Point for Local Contractions

This paper proves the existence and uniqueness of a fixed point for local contractions without assuming the family of contraction coefficients to be uniformly bounded away from 1. More importantly it shows how this fixed‐point result can apply to study the existence and uniqueness of solutions to some recursive equations that arise in economic dynamics.     

Unrestricted consumption under a deterministic wealth and an Ornstein–Uhlenbeck process as a discount rate

We consider an individual or household endowed with an initial capital and an income, modeled as a linear function of time. Assuming that the discount rate evolves as an Ornstein–Uhlenbeck process, we target to find an unrestricted consumption strategy such that the value of the expected discounted consumption is maximized. Differently than in the case with restricted consumption rates, we can determine the optimal strategy and the value function.     

一类集值映射变分不等式及在凸规划中应用

给定弱连续映射 f:X■X~-*,h:X■R 是下半连续正齐次凸泛函.本文在自反空间中给定 f 某种条件下,得出形如 f(x)+(?)h(x)映射变分不等式与补问题解的存在定理,并在数学规划中得到应用.     

简并能级的三阶微扰修正

讨论了简并能级的三阶微扰修正问题,给出了一阶修正和二阶修正简并部分解除情况下的三阶能量修正,也讨论了一阶修正简并未完全解除时的三阶能量修正.