数字传播与数字文明的兴起

卡斯特在论述其"网络社会的崛起"的命题时说,"各种沟通模式整合入一个互动式的网络中.或者换句话说,通过超文本和后设语言的形构,历史上首度将人类沟通的书写、口语和视听模态整合到一个系统里.经过人脑两端,也就是机械和社会脉络之间的崭新互动,人类心灵的不同向度重新结合起来."虽然新闻业所根植的社会系统已发生剧烈变化,但新闻活...     

智能答疑系统中问题类型研究

随着网络的快速发展,人们对搜索引擎的依赖越来越强。传统搜索引擎仅基于关键字,而问答系统能够快速、准确地获取用户所需信息,是新一代搜索引擎。问答系统允许用户使用自然语言提问,能够准确返回用户所需答案。问答系统一般由问题理解、信息检索、答案抽取三部分组成。本文介绍了问题理解中的问题类型分类技术,并给出了具体实现。     

Struts2框架浅析

Struts2作为当今优秀的MVC框架,具有功能强大、使用简单灵活的优点,本文对Struts2的产生背景、运作机制、Struts2框架的搭建等进行了介绍,较全面展现了Struts2框架,以供Struts2框架学习和开发人员参考。     

教育财务管理信息系统设计

为提高学校的信息化管理水平,本文结合学校的业务需求和实际工作情况,研究并设计了适合学校的"教育财务管理信息系统",以期提高学校自身的财务管理效率,为学校的各项行政管理活动以及教学管理提供相关保障,从而促进学校更快更好地发展。本文基于软件工程面向对象的思想,采用统一建模语言UML进行财务管理系统的分析、设计和实现。     

基于Proteus软件的单片机频率测量系统设计

单片机系统的应用在日常生活中已经非常普遍,在单片机系统的具体设计中,如果因为方案有误而进行相应的开发设计,会浪费较多的时间和经费,而Proteus仿真软件可以很好的解决这些问题,其利用单片机的定时/计数器可以非常方便地进行信号的频率测量。本文主要利用ProteusISIS进行单片机系统的仿真,并以此设计一个频率测量系统。     

“生产教学化，教学生产化”人才培养模式的探索与实践

在高职食品加工技术专业中探索出“生产教学化,教学生产化”的工学结合人才培养模式,即以“食品加工高新技术中试工程中心”为依托建立了几条柔性中试生产线,模拟企业提供不同的岗位,供学生轮训。教学内容围绕企业委托的中试项目（产品）等现实任务展开从而实现生产教学化,教学生产化。教学实践表明,此模式有利于提高学生的综合素质能力。     

高炉渣显热综合利用浅谈

本文介绍了目前高炉渣处理、回收利用的现状,提出了热量回收问题的新方法。高炉渣干法新技术有望解决其渣粒化及热量回收的问题,是高炉渣处理利用的发展趋势。     

Minimax optimal control of linear system with input-dependent uncertainty

In this paper, the quadratic minimax optimal control of linear system with input-dependent uncertainty is studied. We show that it admits a unique solution and can be approximated by a sequence of finite-dimensional minimax optimal parameter selection problems. These finite-dimensional minimax optimal parameter selection problems are further reduced to scalar optimization problems which also admit unique solutions. Thus, the original minimax optimal control problem is solved via solving a sequence of simple scalar optimization problems. Numerical experiments are presented to illustrate the developed method.     

Lyapunov-based design of locally collocated controllers for semi-linear parabolic PDE systems

The design problem of collocated feedback controllers is addressed in this paper for a class of semi-linear distributed parameter systems described by parabolic partial differential equation (PDE), where a finite number of local actuators and sensors are intermittently distributed in space. A Lyapunov direct method for the exponential stability analysis of the resulting closed-loop system is first presented for the system, in which the first mean value theorem for integration and the Wirtinger's inequality are employed. The corresponding stabilization condition is then derived through the analysis result. Finally, the proposed design method is implemented on the feedback control of a fisher equation and its effectiveness is evaluated through simulation results.     

Does the Great Firewall Really Isolate the Chinese? Integrating Access Blockage With Cultural Factors to Explain Web User Behavior

The dominant understanding of Internet censorship posits that blocking access to foreign-based websites creates isolated communities of Internet users. We question this discourse for its assumption that if given access people would use all websites. We develop a conceptual framework that integrates access blockage with social structures to explain Web users’ choices, and argue that users visit websites they find culturally proximate and that access blockage matters only when such sites are blocked. We examine the case of China, where online blockage is notoriously comprehensive, and compare Chinese Web usage patterns with those elsewhere. Analyzing audience traffic among the 1000 most visited websites, we find that websites cluster according to language and geography. Chinese websites constitute one cluster, which resembles other such geolinguistic clusters in terms of both its composition and its degree of isolation. Our sociological investigation reveals a greater role of cultural proximity than access blockage in explaining online behaviors.