基于科技文献的时序主题链构建方法

科技文献是科学研究的基础,展示文献中主题的演化过程有助于科研人员把握研究的脉络。针对某领域的科技文献,以构建时序主题链的方式来展现主题随时间变化的事实。为此,提出了主题间转移概率的计算方法和时序主题链的构建方法。实证研究选定国内管理科学领域三个核心期刊在2000-2011年间发表的4244篇论文进行实验,结果表明,时序主题链可以有效地展示主题随时间变化的过程,并能揭示主题演化过程中不同主题间的隐含关系。此外,通过分析时序主题链中的结构特征,还可揭示不同主题间的交叉融合特性。     

Optimal boundary control of heat conduction problems on an infinite time domain by control parameterization

The present paper deals with an optimal boundary control problem in which the process of systems under consideration is governed by a linear parabolic partial differential equation over an infinite time interval. The objective of the paper is to determine the optimal boundary control that minimize a given energy-based performance measure. The performance measure is specified as a quadratic functional of displacement and a suitable penalty term involving the boundary controls. In order to determine the optimal boundary controls, the problem with boundary controls are converted into a problem with distributed controls. The modal space technique is then used to reduce the system into the optimal control of time invariant lumped parameter system. The associated system of uncoupled first order initial value problems is solved in terms of controllers. Next step deals with the computation of the control and trajectory of the linear time-invariant lumped parameter. For this we approximate the controllers by a finite number of orthogonal exponential zero-interpolants over the interval [0,∞). The resultant performance index after using the optimality condition leads to a system of linear algebraic equations. The suggested technique is easy to implement on digital computer. We provide a numerical example to demonstrate the applicability and efficiency of the proposed approach.     

Semantic search for public opinions on urban affairs: A probabilistic topic modeling-based approach

The explosion of online user-generated content (UGC) and the development of big data analysis provide a new opportunity and challenge to understand and respond to public opinions in the G2C e-government context. To better understand semantic searching of public comments on an online platform for citizens’ opinions about urban affairs issues, this paper proposed an approach based on the latent Dirichlet allocation (LDA), a probabilistic topic modeling method, and designed a practical system to provide users—municipal administrators of B-city—with satisfying searching results and the longitudinal changing curves of related topics. The system is developed to respond to actual demand from B-city's local government, and the user evaluation experiment results show that a system based on the LDA method could provide information that is more helpful to relevant staff members. Municipal administrators could better understand citizens’ online comments based on the proposed semantic search approach and could improve their decision-making process by considering public opinions.     

基于文本的留言本的设计

随着网络的发展和cn域名的普及,个人网站得到迅速发展。留言本是个人网站的一个重要的功能之一,本文利用JSP技术设计了基于文本的留言本,既可以满足个人网站的需要,又节省了数据库的费用。     

Effects of a magnetic field on the free convective flow through a porous medium bounded by an infinite vertical porous plate with constant heat flux

This paper investigates the effects of a magnetic field on the free convective flow of a viscous, incompressible, dissipative fluid through a porous medium, occupying a semi-infinite region of the space bounded by an infinite vertical and porous plate. The plate is subjected to a normal suction velocity and the heat flux at the plate is constant. The magnetic field is of uniform strength and is applied perpendicular to the plate. An analytical solution to the problem is obtained. The influence of the magnetic parameter (M) and permeability parameter (K) is discussed for the case of air (P = 0.71) when the plate is subjected to a constant suction velocity and is being cooled by free convection currents.     

自助服务科技研究综述

自助服务科技的出现意味着顾客在没有服务人员的直接参与下能够独立生产服务,满足自己的需求,目前已渗透到人们的生活之中。对国外相关研究文献进行了有选择的梳理,归纳了自助服务科技的内涵、分类和采纳,分析了自助服务科技视角下的顾客角色,同时也分析了自助服务科技与企业绩效的关系,最后进行了文献述评,在评价当前研究不足的同时为未来研究就研究视角、范围和方法提供参考意见。     

科技中介研究综述

科技中介是知识经济时代凸显的重要社会现象.最近20年,人们主要对科技中介的概念、类型、功能、建设等四方面开展了较为深入的研究.但是,从总体上看,深入探讨科技中介机构内在运行机理的文章较少.今后,需要进一步深入分析不同类型科技中介机构的本质特征及其内在机制.     

加强高等院校图书管理工作的探讨

文章结合作者的工作实践,从目前高等院校院校图书馆管理工作中存在的一些实~--f＊3题出发,从完善借阅机制、加强图书馆的硬件和软件建设等方面论述了当今如何做好图书管理工作的意见和建议。     

电子人力资源管理实施效果的研究述评

在电子人力资源管理(e-HRM)的经验研究基础上,探讨分别发生于微观和宏观层面上的四种实施效果:个体性结果、操作性结果、关联性结果和转换性结果。研究针对上述四方面实施效果,为电子人力资源管理的进一步探索提出了建议。     

Intelligent topic selection for low-cost information retrieval evaluation: A New perspective on deep vs. shallow judging

While test collections provide the cornerstone for Cranfield-based evaluation of information retrieval (IR) systems, it has become practically infeasible to rely on traditional pooling techniques to construct test collections at the scale of today’s massive document collections (e.g., ClueWeb12’s 700M+ Webpages). This has motivated a flurry of studies proposing more cost-effective yet reliable IR evaluation methods. In this paper, we propose a new intelligent topic selection method which reduces the number of search topics (and thereby costly human relevance judgments) needed for reliable IR evaluation. To rigorously assess our method, we integrate previously disparate lines of research on intelligent topic selection and deep vs. shallow judging (i.e., whether it is more cost-effective to collect many relevance judgments for a few topics or a few judgments for many topics). While prior work on intelligent topic selection has never been evaluated against shallow judging baselines, prior work on deep vs. shallow judging has largely argued for shallowed judging, but assuming random topic selection. We argue that for evaluating any topic selection method, ultimately one must ask whether it is actually useful to select topics, or should one simply perform shallow judging over many topics? In seeking a rigorous answer to this over-arching question, we conduct a comprehensive investigation over a set of relevant factors never previously studied together: 1) method of topic selection; 2) the effect of topic familiarity on human judging speed; and 3) how different topic generation processes (requiring varying human effort) impact (i) budget utilization and (ii) the resultant quality of judgments. Experiments on NIST TREC Robust 2003 and Robust 2004 test collections show that not only can we reliably evaluate IR systems with fewer topics, but also that: 1) when topics are intelligently selected, deep judging is often more cost-effective than shallow judging in evaluation reliability; and 2) topic familiarity and topic generation costs greatly impact the evaluation cost vs. reliability trade-off. Our findings challenge conventional wisdom in showing that deep judging is often preferable to shallow judging when topics are selected intelligently.     

国外创业团队研究综述

对国外创业团队研究状况作简要回顾,并指出不足和未来的研究方向.     

战略变化理论阐释评述

战略变化理论是当前战略管理研究领域的一个重要内容。本文阐述了战略变化的基本概念,总结现有的战略变化研究的理论基础及主要观点,并进一步指出了战略变化研究不足以及对今后有关研究方向的建议。     

产业创新系统研究综述

在文献研究的基础上,从产业创新系统的概念、分类、模型研究、与国家创新系统的区剐和联系、与特定产业相结合的实证研究、国内外比较研究、服务创新系统研究以及政策启示等方面对国内外产业创新系统的研究进行了全面回顾和总结,并提出了该领域进一步研究的方向.     

制造柔性理论与实证研究综述

本文介绍了国外相关文献中制造柔性理论的若干研究方向及其主要成果,从制造柔性的概念、类型与环境变量的关系等方面的理论研究进行回顾,对制造柔性与企业绩效关系的实证研究进行归纳总结,并指出现有研究的不足,对未来的研究进行了展望。