企业私有云计算基础架构研究与设计

随着信息化在企业中的深入运用,传统IT架构慢慢显现出弊端：基础资源利用率偏低、管理上太分散;面对管理或业务出现变化时,旧的业务系统难以快速响应.怎样实现业务同IT建设的协同,怎样对IT系统现有数据进行利用,这些都成为当下企业立刻要解决的.“云计算”作为眼下信息领域炙手可热的技术,一方面它能对现有IT资源进行很好地整合,另一方面面对业务变化时它能实现IT建设的迅速响应,因此它的研发为解决企业的上述难题提供了希望.     

基于Java RMI的分布计算系统

本文利用ＪＡＶＡ语言的平台无关性,可移植性以及它的ＲＭＩ特性即远程方法调用,给出在网络上进行分布计算的系统ＪＤＣＳ。     

Javelin: Parallel computing on the internet

Java offers the basic infrastructure needed to integrate computers connected to the Internet into a seamless distributed computational resource: an infrastructure for running coarse-grained parallel applications on numerous, anonymous machines. First, we sketch such a resource’s essential technical properties. Then, we present a prototype of Javelin, an infrastructure for global computing. The system is based on Internet software that is interoperable, increasingly secure, and ubiquitous: Java-enabled Web technology. Ease of participation is seen as a key property for such a resource to realize the vision of a multiprocessing environment comprising thousands of computers. Javelin’s architecture and implementation require participants to have access to only a Java-enabled Web browser. Experimental results are given in the form of a Mersenne Prime application and a ray-tracing application that run on a heterogeneous network of several parallel machines, workstations, and PCs. Two key areas of current research, fault-tolerance and scalability, are subsequently explored briefly.     

Java平台技术及新进展

Ｊａｖａ以其“编写一次，各处运行”的特性，在短短的三年中得到了出人意料的快速发展和广泛应用，本文从多个方面对Ｊａｖａ进行了介绍和评停，包括：Ｊａｖａ语言、Ｊａｖａ平台、Ｊａｖａ标准、Ｊａｖａ应用环境和Ｊａｖａ应用等。     

Jini技术应用及其与EJB的比较

本文在研究分布式计算必要性的基础上,通过对Jini结构牲特征的探讨,比较了Jini和EJB的异同点,并就其提出了一种综合应用的实例。     

Bayanihan: building and studying web-based volunteer computing systems using Java

Project Bayanihan is developing the idea of volunteer computing, which seeks to enable people to form very large parallel computing networks very quickly by using ubiquitous and easy-to-use technologies such as web browsers and Java. By utilizing Java’s object-oriented features, we have built a flexible software framework that makes it easy for programmers to write different volunteer computing applications, while allowing researchers to study and develop the underlying mechanisms behind them. In this paper, we show how we have used this framework to write master-worker style applications, and to develop approaches to the problems of programming interface, adaptive parallelism, fault-tolerance, computational security, scalability, and user interface design.     

Java在科学计算方面的并行处理

讨论了Ｊａｖａ和Ｗｅｂ技术在科学和工程计算中的作用。应用三种大计算量问题,调查了Ｊａｖａ作为高性能并行分布计算语言的可能性。Ｊａｖａ将能够很好地成为科学和工程领域的主导语言。     

Developing technologies for broad-network concurrent computing

Recent developments in networking infrastructures, computer workstation capabilities, software tools, and programming languages have motivated new approaches to broad-network concurrent computing. This paper describes extensions to concurrent computing which blend new and evolving technologies to extend users' access to resources beyond their local network. The result is a concurrent programming environment which can dynamically extend over network and file system boundaries to envelope additional resources, to enable multiple-user collaborative programming, and to achieve a more optimal process mapping. Additional aspects of the derivative environment feature extended portability and support for the accessing of legacy codes and packages. This paper describes the advantages of such a design and how they have been implemented in the environment termed “IceT”.     

Simplifying autonomic enterprise Java Bean applications via model-driven engineering and simulation

The goal of autonomic computing is to reduce the configuration, operational, and maintenance costs of distributed applications by enabling them to self-manage, self-heal, and self-optimize. This paper provides two contributions to the Model-Driven Engineering (MDE) of autonomic computing systems using Enterprise Java Beans (EJBs). First, we describe the structure and functionality of an MDE tool that visually captures the design of EJB applications, their quality of service (QoS) requirements, and the adaptations applied to their EJBs. Second, the paper describes how MDE tools can be used to generate code to simulate adaptive systems for verification and plug EJBs into a Java component framework that provides runtime adaptation capabilities.     

Java Servlet会话跟踪技术的应用研究

Java已经成为最受欢迎的企业级服务器端编程语言，其JavaServlet技术为应用Web的企业使用Java技术提供了一种核心的方法，文中介绍了JavaServlet及其会话跟踪技术的框架，分析了在JavaServlet中使用会话跟踪技术应注意的若干问题，最后给出了一个基于JavaServlet及其会话跟踪技术的典型应用－－购物车应用程序的实现。     

Java for high‐performance network‐based computing: a survey

There has been an increasing research interest in extending the use of Java towards high‐performance demanding applications such as scalable Web servers, distributed multimedia applications, and large‐scale scientific applications. However, extending Java to a multicomputer environment and improving the low performance of current Java implementations pose great challenges to both the systems developer and application designer. In this survey, we describe and classify 14 relevant proposals and environments that tackle Java's performance bottlenecks in order to make the language an effective option for high‐performance network‐based computing. We further survey significant performance issues while exposing the potential benefits and limitations of current solutions in such a way that a framework for future research efforts can be established. Most of the proposed solutions can be classified according to some combination of three basic parameters: the model adopted for inter‐process communication, language extensions, and the implementation strategy. In addition, where appropriate to each individual proposal, we examine other relevant issues, such as interoperability, portability, and garbage collection. Copyright © 2002 John Wiley & Sons, Ltd.     

石化企业云计算数据中心设计

随着中国石化建设世界一流能源化工公司的重大决策的制定,建设"世界一流信息化能力"的信息化战略目标提出,企业IT管理的标准化、内部控制的流程化,现有的烟囱式IT基础设施架构已不能满足按需分配资源需求。云计算的广泛实践为企业数据中心建设提供了技术基础。本文应用基础设施即服务(IaaS)架构对企业数据中心进行设计,对计算、存储、网络、安全等资源池进行了详细设计,并在企业进行了实施。本文提出的云计算数据中心可以为今后一个时期的石化企业信息化应用奠定基础。     

Object‐oriented distributed computing based on remote class reference

Java RMI, Jini and CORBA provide effective mechanisms for implementing a distributed computing system. Recently many numeral libraries have been developed that take advantage of Java as an object‐oriented and portable language. The widely‐used client‐server method limits the extent to which the benefits of the object‐oriented approach can be exploited because of the difficulties arising when a remote object is the argument or return value of a remote or local method. In this paper this problem is solved by introducing a data object that stores the data structure of the remote object and related access methods. By using this data object, the client can easily instantiate a remote object, and use it as the argument or return value of either a local or remote method. Copyright © 2003 John Wiley & Sons, Ltd.     

The greenhouse gas abatement potential of enterprise cloud computing

In this paper we present a dynamic, country level methodology and model to determine the energy related Green House Gas (GHG) emissions abatement potential of enterprise cloud computing. The developed model focused upon demonstrating the impact of a move to cloud computing from traditional on-site computing, by creating country specific estimates of energy and GHG reductions. The methodology presented includes variables for market penetration, organisation size, and organisational adoption of on-site and cloud computing. Using the current enterprise cloud service applications of email, customer relationship management (CRM), and groupware against selected global countries, results indicated that 4.5 million tonnes of CO₂e could be reduced with an 80% market penetration for cloud computing. The majority of reductions were calculated to be from small and medium size organisations. A sensitivity analysis of the market penetration and current organisational adoption of cloud computing highlights the possible large variability in overall energy and GHG reductions. An analysis of the model and data used within this study illustrates a requirement for industry and academia to work closely in order to reach the large energy reductions possible with enterprise cloud computing.     

Java虚拟机异常处理机制的设计与实现

异常处理机制是程序设计语言的重要特征之一,它为开发可靠性软件系统提供了强有力的支持,介绍了不同语言的异常处理机制,对Ｊａｖａ语言的异常处理机制进行了详细论述,最后结合国产开放系统平台ＣＯＳＩＸ虚拟机异常处理的设计,深入探讨了在解释才及时编译执行两种不同的情况下,异常处理设计与实现的关键技术。     

Java处理器中指令合并技术的研究与实现

文中在分析Ｊａｖａ虚拟机及字节码特性基础上,研究了Ｊａｖａ处理器中的指令合并技术。对３种合并策略：２条指令的合并,３条指令的合并及４条指令的合并进行了分析比较,并分别实现了这３种合并策略。研究表明４条指令合并策略具有较高的性能／开销比。     

Packet aggregation based network I/O virtualization for cloud computing

Virtualization is a key technology to enable cloud computing. Driver domain based model for network virtualization offers isolation and high levels of flexibility. However, it suffers from poor performance and lacks scalability. In this paper, we evaluate networking performance of virtual machines within Xen. The I/O channel transferring packets between the driver domain and the virtual machines is shown to be the bottleneck. To overcome this limitation, we proposed a packet aggregation based mechanism to transfer packets from the driver domain to the virtual machines. Packet aggregation, combined with an efficient core allocation, allows virtual machines throughput to scale up by 700%, while minimizing both memory and CPU consumption. Besides, aggregation impact on packets delay and jitter remains acceptable. Hence, the proposed I/O virtualization model satisfies infrastructure providers to offer Cloud computing services.     

CIMOSA: enterprise engineering and integration

Enterprises are rather complex systems which have to be managed for their internal affairs, but more importantly for the many relations to the different environments in which they are operating. Today, these environments are changing much more rapidly and the need for relevant information becomes of paramount importance in the decision making processes at all levels of enterprise management. Fluctuations in market demands, technology evolution and changing regulations require very flexible enterprise operations, capable of reacting to those changes. These reactions must be based on relevant and up-to-date information which must be supported by new decision support technology. The challenges in decision support concern the identification of relevant information, easy access and intelligent use of this information. Building and maintaining the enterprise knowledge base and enabling its efficient use for decision support are major tasks of enterprise engineering. Enterprise integration and its subsequent operation in the global environment of customers, suppliers and regulatory bodies will heavily depend on the availability and the continuous extension of this knowledge base. Enterprise modelling will play an important role in creating the knowledge base and in using it for enterprise integration and operational decision support. The paper discusses enterprise engineering as an enterprise life-cycle oriented discipline for identification, design, and implementation of enterprises and their continuous evolution. Current problems in the field are identified and initiatives are presented.     

普适计算：人本计算

普适计算强调以人为本的计算思想，它主张计算应迎合人的习性，自主地与使用者产生互动，使用户能集中精力于所要完成的任务。在普适计算环境下，计算将融入到人们的日常生活之中，使人们能够随时随地无妨碍地获得计算和信息服务。综述了普适计算的发展历史、现状和研究热点，分析和讨论了普适计算的概念和特性，最后对目前一些具有代表性的普适计算研究项目进行了简要的介绍和分析。     

云计算背景下软件企业创新的趋势

云计算是一种基于互联网的计算方式,通过这种方式,共享的软硬件资源和信息可以按需提供给计算机和其他设备,该技术是一种近些年来发展的新兴科技,同时在一定的程度之上遍布于软件企业的各个领域之中,引导着当前软件企业发展的方向.基于此,本文探讨了云计算背景之下软件企业创新的趋势.