服务器虚拟化在数据中心建设中的应用

本文研究了服务器虚拟化在数据中心建设中的应用模式,首先阐述了服务器虚拟化的概念和优势,其次阐述了服务器虚拟化在数据中心建设中的主要应用模式,最后以服务器虚拟化技术在企业数据中心的实现为实例,论述了其具体应用。     

服务器应用现状与服务器虚拟化分析

随着信息技术的高速发展,越来越多的企业有了一定规模的网络应用,企业信息化建设水平的不断提高,数据中心服务器对日常工作的影响越来越大,企业中不断增加的服务器设备在方便工作的同时也带来了管理复杂化、成本扩大化的问题。而服务器虚拟化技术简化了服务器管理系统,将多种应用整合,提高了服务器使用效率。本文就企业数据中心服务器应用现状、虚拟化技术的应用、服务器虚拟化面临的问题以及服务器虚拟化技术发展的意义展开。     

服务器虚拟化在企业数据中心的应用

欧美发达国家正在广泛应用虚拟化技术,本文简要介绍了当前主流的服务器虚拟化技术以及虚拟化技术企业数据中心的应用。     

虚拟化技术在新一代数据中心网络的应用

随着云计算及虚拟化技术应用的不断发展,融入了虚拟化技术的云计算数据中心成为IT建设的重点和核心。数据中心底层基础架构的网络,也进入新一轮技术革命时期。基于CIOQ的Crossbar架构和基于动态路由的CLOS交换架构,对于支持高端机架式交换机和路由器有着广泛的应用。虚拟化技术更是涉及到数据中心的每一个领域,完成端到端的网络虚拟化部署。在此基础上,分析了数据中心网络面对服务器虚拟化时遇到的问题,并详细介绍了解决方案。     

企业数据中心网络虚拟化环境中边界感知安全技术和应用

由于企业数据中心处理并保存着大量的信息,数据中心的安全至关重要,其中网络安全是关键环节之一。数据中心网络虚拟化使得网络边界深入至宿主服务器内部,网络安全设备需要感知这些边界才能进行有效监控。对现有的网络虚拟化边界感知安全技术进行分类研究,探讨各类技术的原理、优势、不足及应用,并且展望了数据中心网络虚拟化技术及边界感知安全技术的发展趋势。     

高校数据中心的建设研究

随着高校校园网建设过程中数据中心的应用需求不断增加,导致服务器数量的增长过快,功耗上升迅速。数据中心面临着系统管理复杂,资源利用率偏低,安全控制与数据备份复杂,运行维护成本昂贵等问题。本文对现有的服务器虚拟化技术进行了分析和比较,并对数据中心架设虚拟化平台提出了实施建议。     

基于利用率提升的服务器虚拟化技术应用探讨

企业的IT基础设施越来越多,由于服务器设备的增加,导致企业的中心机房管理难度越来越大,在这种情况下服务器虚拟化技术应运而生,服务器虚拟化技术能极大的提高企业数据利用率和管理水平.文章重点介绍了服务器虚拟化技术及其在企业数据中心的应用.     

虚拟化技术在新一代云计算数据中心的应用研究

目前,随着科技水平的不断提高,对云计算数据中心提出了更高的要求。虚拟化技术解决了电脑主机限制操作技术的问题,可以实现多个操作技术同时运行。虚拟化技术依托云计算和数字化等先进科学技术,推动云计算数据中心不断发展,但实际发展中,其还存在一些问题。基于此,主要研究、探讨了虚拟化技术在云计算数据中心中存在的问题,以期为供相关部门提供参考。     

虚拟化数字校园平台研究

针对高校数据中心建设中存在的资源利用率低,管理维护困难等问题,该文引入了虚拟化技术,论述了虚拟化技术及其分类,构建了基于VMware Infrastructure的虚拟化数字校园平台,介绍其功能设计、体系结构、实施步骤等。有效地节约了服务器资源,降低了数据中心的建设与运营成本。     

关于云计算数据中心中网络虚拟化技术的应用浅析

网络是云计算数据中心的载体,同时也是云计算向用户提供服务的重要途径,网络虚拟化技术的质量决定了云计算数据中心的运行情况。着重阐述云计算数据中心中网络虚拟化技术的应用情况,希望对相关行业有所帮助。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.