网络控制系统的稳定性分析和研究

该文针对目前网络控制系统的研究现状,阐述了在网络控制系统的分析和设计中需要明确的几个基本问题。综述了具有时变传输周期、网络调度、数据丢包以及网络时滞时的网络控制系统的建模与各种控制策略问题。尤其是网络控制系统在这些情况下的稳定性研究问题,然后列举了一些具有代表性的网络控制系统稳定性分析的最新结果。在此基础上分析了网络控制系统稳定性分析研究中尚待解决的问题,以及新的研究方向。     

网络能耗系统模型及能效算法

网络能耗问题是当前网络研究和发展的重要问题,影响着网络的设计、应用和发展.当前网络能效算法的研究大多从网络局部角度关注于网络某一(些)设施的能耗问题,缺乏从网络全局的角度研究网络整体能耗的算法和策略.文中从网络全局角度研究网络的能耗模型和算法问题.文中基于3种基本网络数据传递模式和3种基本网络能耗机制,构建了网络能耗系统优化模型,对其中5种关键系统模型给出了详细的描述.针对几个关键系统模型,文中给出了形式化描述并且提出了相应的优化的节能路由算法.文中给出的网络系统能耗优化模型有助于对于网络能耗的理解和分析,所提出的能耗优化的网络数据包路由算法可以从网络路由的角度有效降低网络能耗.     

网络控制系统的控制器设计方法概述

网络时延是网络控制系统（NCS）中存在的基本问题,克服网络时延的影响是设计网络控制系统的控制器首先要解决的问题。为此分别从短时延网络控制系统和大时延网络控制系统2个方面,重点分析了近年来网络控制系统控制器设计的研究现状和成果,总结了现有的研究方法,讨论了最新研究进展,指出存在的问题,并对未来的发展方向进行了展望。     

虚拟网络映射问题研究及其进展

随着互联网的快速发展,现有的互联网架构已经难以满足互联网新型应用的发展,在一定程度上呈现出僵化现象.网络虚拟化被认为是解决网络僵化问题的重要途径,其中的虚拟网络映射问题研究如何将具有虚拟节点和虚拟链路约束的虚拟网络映射到基础设施网络中.首先给出了虚拟网络映射问题的形式化定义,分析了虚拟网络映射问题面临的挑战性和求解目标;其次,对各种虚拟网络映射问题的求解方法加以分类,在分类的基础上,介绍了各种典型的求解方法并进行了对比;最后总结了各种虚拟网络映射问题求解方法,并指出了未来的研究趋势.     

基于网络数据库安全技术研究

随着网络技术的发展,数据库系统的安全问题日益突出,其安全保密性已成为目前所迫切需要解决的问题。该文从网络数据库安全基本知识开始介绍,重点讲解了数据库服务器安全研究问题,最后概述了网络数据库安全性研究的意义。     

移动Ad Hoc网络技术分析

介绍了Ad Hoc网络的发展、特点和应用领域.对Ad Hoc网络的体系结构进行了研究.深入分析了Ad Hoc网络面临的特殊问题,并讨论了这些问题的影响及引发的研究方向.     

复杂公交社团网络模型的稳定性研究

为了研究城市公共交通网络的动态特征,在现有公交网络模型的基础上,建立了一类新的复杂公交网络模型。同时基于派系过滤算法,对复杂公交网络模型进行了社团结构分析。以Lorenz系统为网络的节点,研究了复杂公交社团网络的同步问题。通过改变公交车辆之间的控制强度、删除网络中普通公交线路和关键公交线路,研究了公交社团网络的同步问题。采用Matlab仿真技术分析了公交车辆的人为调度和线路优化对公交线路网络稳定性的影响。     

网络控制系统稳定性研究

综述了目前网络控制系统的研究现状,介绍了随机延迟问题、数据包丢失问题和多通道输出问题的建模以及各种控制策略.在此基础上,分析了网络控制系统稳定性研究中尚待解决的问题以及一些新的研究方向.     

网络拓扑结构的数学模型及遗传算法

提出了网络拓扑结构的定义,以ATM网络问题为例建立了优化问题的数学模型,并描述了用遗传算法并作求解该问题的方法。该方法较圆满地解决了既考虑经济效益又考虑需求的ATM网络问题。该问题的研究对实际应用及推动动态网络的研究有十分重要的意义。     

网络抗毁性研究介绍

随着通信网络规模的不断扩大和应用范围的不断拓展,网络抗毁性的研究日益受到重视.阐述了网络抗毁性的定义,介绍了目前网络抗毁性问题的主要研究及内容,指出了网络抗毁性未来研究的主要方向.     

A multi-method, holistic strategy for researching critical success factors in IT projects

In the field of information systems (IS) there is an observable trend towards the use of multi-method research. Using different research methods allows for the cross-validation of data obtained via multiple approaches, with the potential to increase the robustness of research results. Such a multi-method approach is applicable to a comprehensive research agenda on critical success factors, an agenda that needs to take into account not only the identification, but also the analysis and management of critical success factors. The goal of this article is to contribute new knowledge on how to carry out research on critical success factors in IS projects using a multi-method approach. For this purpose, two research projects are presented, each a variation of the research design customized to particular circumstances. First, there is an outline of the research approach taken for a critical success factor research project in the field of portal implementation, with discussion of the strengths and weaknesses of the project. Taking into consideration these experiences, the research approach of a similar critical success factor research project in the field of offshore software development is then described. Finally, recommendations for using the multi-method research approach in critical success factor research are presented.     

Analyzing of research patterns based on a temporal tracking and assessing model

Scientific research works conducted by researchers spread all over the world in every research field, which are hard to be tracked and quantified. Although there are many research works focused on scientific community discovery and researcher profiling, it is still a big challenge to track the research patterns and assess the research development for an individual researcher or a research group over time. In this study, we seek to model researchers’ scientific activities and quantify their outcome during their research career. A temporal tracking and assessing model is introduced to represent the research development and quantify the scientific outcome for both an individual and a group along the time. Based on our model, a research topic analyzing approach is developed to extract the topics covered by a research group for the research pattern analysis. Furthermore, a latent research pattern discovering approach is proposed to depict how a research group’s research works contributed by its members are discovered and visualized. The effectiveness of our approach is evaluated based on a real academic dataset.     

Interpretation,intervention, and reduction in the organizational laboratory: a framework for in-context information system research

Understanding how technical artefacts are created and used within organizations is a central aspect of the IS research discipline. The conduct of research in an organizational setting is thus a major issue for the IS community. A research framework for in-context IS research is presented and used to position purified and hybrid forms of research method. From the framework theoretical support for an `action case' research method is presented. Two IS research cases are presented and analyzed using the IS research framework, leading to a practice-based rationale for an action case method. Characteristics of the action case method, a hybrid of interpretation and intervention, are described. Learning at three levels of analysis—concrete, general, and meta—is proposed and used as a way of reflecting on IS research methods and IS research frameworks.     

并行算法研究方法学

并行算法是计算机科学中重要的研究内容,已有几十年的发展历程.回顾一下其研究历程,既有高潮也有低谷,究其原因是,它没有形成自身的一套研究方法学.为此文中提出并行算法研究要建立起一套完整的"理论-设计-实现-应用"的学科体系,也就是所谓的并行算法研究的生态环境.只有这样才能够保持并行算法研究稳定、可持续发展,并使得并行算法的研究成果更加实用,从而更富有生命力.     

基于Alpha-Beta搜索算法的中国象棋人机对战的设计与实现

计算机博弈是人工智能研究的一个重要分支,人类在计算机博弈领域的研究取得了大量的研究成果,这些成果在人工智能领域产生了重要影响。中国象棋计算机博弈的研究起步晚于国际象棋,但国际象棋计算机博弈研究的成果为我们提供了很多的借鉴技术。近年来随着研究的不断深入,中国象棋计算机博弈越来越成为继国际象棋后计算机博弈研究的热点之一。     

A research framework for analysing eBusiness models

As eBusiness is moving towards maturity, research interests shift to the investigation of opportunities for market exploitation of eBusiness technologies. As a result, the debate around business models naturally becomes more topical. However, while many researchers and practitioners are contemplating business models, there is an alarming lack of theoretical tools in the literature to structure and codify knowledge in the area. This paper draws on an extensive review of the literature to propose an analytic framework that decomposes the area of business models into eight research sub-domains. The proposed framework is then applied to organize and critically review existing research under each sub-domain as well as to define an agenda of future challenges on business model research. The framework can benefit future research by allowing researchers to better concentrate their efforts and place their contributions in an overall context, thus assisting in building a coherent body of knowledge in the challenging research domain of business models.     

The open source software phenomenon: Characteristics that promote research

Since the turn of the century, open source software has triggered a vast volume of research. In this essay, based on a brief review of selected work, we show that research in many different fields and disciplines of the social sciences have shed light on the phenomenon. We argue that five characteristics make the phenomenon particularly attractive to examination from various fields and disciplines using a plethora of research methods: (1) impact: open source software has an extensive impact on the economy and society; (2) theoretical tension: the phenomenon deviates sharply from the predictions and explanations of existing theory in different fields; (3) transparency: open source software has offered researchers an unprecedented access to data; (4) communal reflexivity: the community of open source software developers frequently engage in a dialog on its functioning (it also has its own research community); (5) proximity: the innovation process in open source software resembles knowledge production in science (in many instances, open source software is an output of research processes). These five characteristics also promote a transdisciplinary research dialog. Based on the experience of open source software research, we propose that phenomena-driven transdisciplinary research provides an excellent context to promote greater dialog between disciplines and fields. Moreover, we propose that the recent diffusion of the open source software model of innovation to other areas than software calls for new research and that the field of information systems has an important role to play in this future research agenda.     

A social recommendation system for academic collaboration in undergraduate research

Academic collaboration plays an important role in undergraduate research. Current methods rely on offline social contacts for undergraduate students to collaborate with academic staff members in universities and research institutions. In big data era, it is difficult for undergraduate students to find suitable research project opportunities and supervisors to work with. This paper proposes a social recommendation system for undergraduate students to find research project opportunities and work with research project teams on an academic collaboration network. The proposed recommendation method integrates relevance, connectivity, and quality modules, where profiles of undergraduates are constructed with their self‐claimed information, research activities (e.g., studying and reading research publications and reading research projects), and social connections in the academic collaboration network. Suitable research projects are recommended based on the undergraduates' profiles. Experiments are conducted, and the results have shown that the proposed social recommendation system can facilitate undergraduates' selection of research projects.     

MATLAB在数字水印中的应用

数字水印技术是国内外一个新的研究热点 ,但其跨学科性常常给研究工作带来许多困难 ,选择一个合适的工具尤为重要。从实际应用出发 ,介绍了一种高效、实用并且适合于数字水印研究的工具—— MATL AB,归纳了常用于水印技术研究的函数 ,最后通过一个实例介绍了如何把 MATLAB应用于数字水印技术     

Highlighting the Duality of the ICT and Development Research Agenda

Central to this paper is the argument that existing classifications of the information and communication technology and development literature fail to explicitly acknowledge a fundamental duality between two distinct problem domains found within the research body. Through an extensive review of 184 journal articles and conference proceedings, a framework is proposed that suggests a partitioning of the existing literature into two distinct streams of research: (1) those studies that focus on understanding technology “for development” and (2) those studies that focus on understanding technology “in developing” countries. More than an exercise in semantics, the authors argue that the two streams represent separate sets of research objectives that are currently being conflated and addressed interchangeably within the same research environment. At present, there appears to be little recognition or explicit acknowledgement of this branching of research domains, as well as little reflexive discussion on the epistemological, methodological and theoretical implications of this delineation. A discussion related to the efficacy and relevance of the two separate research agendas is provided, along with recommendations for future research directions.