改进AHP-BP神经网络算法研究——以建筑企业循环经济评价为例

针对传统AHP中专家权重确定方法的局限性,本文提出一种基于利益相关者视角的专家权重确定方法对AHP进行改进。首先计算专家之间的利益相关系数,然后依据评价值矩阵得到所有专家的综合评价值,进而确定每一位专家在专家群体中的评价权重,最后将传统AHP所得指标权重与专家评价权重进行加权平均即得各指标的综合权重。再以改进AHP得到的评价值作为先验样本进行BP神经网络的训练与测试,得到可供推广的分类器。以建筑企业循环经济评价进行实证研究,结果表明构建的改进AHP-BP神经网络模型所得评价结果较已有方法更为准确可靠。     

基于SNA的突发事件微博舆情传播网络结构分析——以“4.20四川雅安地震”为例

运用社会网络分析(SNA)研究突发事件微博舆情传播的网络结构特征,探究微博舆情传播的网络结构对微博信息传播的影响。以2013年重大突发事件"4.20四川雅安地震"为例,运用ucinet软件生成微博舆情传播网络拓扑图,基于统计得到的微博节点关系矩阵进行微博舆情传播网络整体结构、角色与位置结构等测量。测量结果表明,媒体用户、政府用户、地震经历者以及积极参与救援者在舆情传播网络中具有较高的传播能力,因此可以通过影响这些关键节点有效控制舆情的传播速度。本文采用实证方式对突发事件微博舆情传播网络结构进行了分析与测量,拓展了SNA在突发事件应急管理中的应用。     

多重不确定环境下基于证据理论的NIS安全风险评估模型

以证据理论为基础,构造一种能够适应多重不确定环境的网络信息系统安全风险评估模型。在模型中建立安全风险评估指标体系并对指标权重进行量化;重新定义基本概率赋值函数,以适应安全风险评估过程中证据的不确定性描述;实现证据一致性检验并确定调整方法,从而进一步降低评估过程中专家经验的不确定性;最后,通过实证分析验证该模型的正确性和有效性。     

金融危机下带传染效应的违约预报

考虑多阶段状态变量的动态信息对违约风险的影响,同时考虑宏观因素和公司个体因素来构建违约预报模型,并且通过在状态变量中包含的行业因素来刻画行业间可能存在的信用传染效应;建立违约风险强度中参数的极大似然估计和渐近性质,进而建立条件违约概率期限结构的极大似然估计.利用极大似然估计及其渐近性质考虑传染效应的显著性检验问题,最后...     

面向开放式团队知识创新的动态标签关联网研究

知识创新是企业提高核心竞争力最重要的手段之一。当今世界经济一体化,全球创新方向正在向开放式创新转变。开放式创新环境下,跨组织、跨地域的开放式创新团队成为知识创新的主要载体。社会化标签能够使团队成员按照自己对知识的认知方式进行知识交互与协作,有利于促进开放式团队知识创新。但是由于标签标注的自由性,如何建立标签之间的关联关系以更有效地支持开放式环境中基于标签的知识管理与知识创新成为该领域的关键议题。本文研究并提出了面向开放式团队知识创新的动态标签关联网方法,并对该方法进行了应用研究,通过比较实验组和对照组的应用结果,可以发现面向开放式团队知识创新的动态标签关联网方法能够动态地展示标签之间的关联关系,从而支持开放式环境中的团队知识创新。     

Single-machine batch delivery scheduling with an assignable common due window

This paper addresses a batch delivery single-machine scheduling problem in which jobs have an assignable common due window. Each job will incur an early (tardy) penalty if it is early (tardy) with respect to the common due window under a given schedule. There is no capacity limit on each delivery batch, and the cost per batch delivery is fixed and independent of the number of jobs in the batch. The objective is to find the optimal size and location of the window, the optimal dispatch date for each job, as well as an optimal job sequence to minimize a cost function based on earliness, tardiness, holding time, window location, window size, and batch delivery. We show that the problem can be optimally solved in O(n⁸)$O(n^8)$ time by a dynamic programming algorithm under a reasonable assumption on the relationships among the cost parameters. A computational experiment is also conducted to evaluate the performance of the proposed algorithm. We also show that some special cases of the problem can be optimally solved by lower order algorithms.     

Risks Perception of Electromagnetic Fields in Taiwan: The Influence of Psychopathology and the Degree of Sensitivity to Electromagnetic Fields

Little is known about the perceived health risks of electromagnetic fields (EMFs) and factors associated with risk perception in non‐Western countries. Psychological conditions and risk perception have been postulated as factors that facilitate the attribution of health complaints to environmental factors. This study investigated people's perceived risks of EMFs and other environmental sources, as well as the relationships between risk perception, psychopathology, and the degree of self‐reported sensitivity to EMFs. A total of 1,251 adults selected from a nationwide telephone interviewing system database responded to a telephone survey about the relationships between environmental sources and human health. The interview included questions assessing participants’ psychiatric conditions and the presence and degree of sensitivity to EMFs. One hundred and seventy participants were self‐identified as having sensitivity to EMFs, and 141 met the criteria for psychiatric conditions without EMF sensitivity. More than half of the survey respondents considered power lines and mobile phone base stations to affect people's health to a big extent. Higher sensitivity to EMFs, psychopathology, being female, being married, more years of education, and having a catastrophic illness had positive associations with perceived risks of EMF‐related environmental sources as well as for all environmental sources combined. We observed no moderating effect of psychopathology on the association between degree of sensitivity to EMF and risk perception. Thus, psychopathology had influence on general people's risk perception without having influence on the relationship between people's degree of sensitivity to EMF and risk perception. The plausible explanations are discussed in the text.     

Landau多项式算子与无界函数逼近

利用扩展乘数法构造了 Landau型多项式算子逼近全空间或有界集上无界函数的若干收敛定理 ,给出了具有一般性的结论 ,从而推广了已有文献的若干结果 .     

基于"平台+模块"高职人才培养方案构建与实施探索——以广州城市职业学院为例

人才培养方案是人才培养的总体设计方案，是组织教育教学活动的工作蓝图和总体规划。文章基于广州城市职业学院近年来高职人才培养方案的构建与实施，从高职教育教学理念转变、专业课程改革、实践教学体系构建、职业能力培养、办学特色等方面进行探讨，对正处于快速发展阶段、加强内涵建设的高职教育有着借鉴意义。     

论几何图形在数学分析证明中的作用

论述了几何图形与数学分析命题的相互关系 ,以实例说明了几何图形对命题证明的作用