基于XACML安全策略的J2EE应用服务器安全授权框架

安全与授权问题是企业应用的关键问题,而目前J2EE规范中的安全授权服务缺乏足够的安全描述能力.提出支持XACML安全策略的安全授权框架,为J2EE应用服务器的各个组件描述复杂的安全逻辑,并提供灵活的安全授权服务,降低了企业应用开发以及系统维护的成本.该框架在中科院软件所自主研发的J2EE应用服务器OnceAS中得到实现.     

基于Oracle AS Portal下的Java Portlet开发

Oracle AS Portal是Oracle应用服务器的一个组成部分．用于构建和部署企业级门户系统。PDK—Java提供了一个在Portal下用Java开发Portlet的框架，从而简化了对Java Portlets的开发。文中介绍了基于PDK-Java框架下进行Java Portlet开发的技术步骤．并实现了多页面Portlet和支持Struts的Portlet两种不同的Java Ponlet开发。     

基于Oracle AS Portal下的Java Portlet开发

Oracle AS Portal是Oracle应用服务器的一个组成部分,用于构建和部署企业级门户系统。PDK-Java提供了一个在Portal下用Java开发Portlet的框架,从而简化了对Java Portlets的开发。文中介绍了基于PDK-Java框架下进行Java Portlet开发的技术步骤,并实现了多页面Portlet和支持Struts的Portlet两种不同的Java Portlet开发。     

一种业务逻辑可重构的三层应用服务器设计与实现

将网络应用系统的逻辑抽象为表单流、事件流和数据流，提出了一种业务逻辑可重构的三层应用服务器框架，由此开发了具有可重构能力的企业信息化综合业务处理系统(ICETIP)应用服务器。ICETIP应用服务器实现了客户连接池和数据库连接池的协调工作，给出了一种客户端和服务器之间通信机制。ICETIP系统的主要特点是提出了一种全新的网络应用开发与维护模式，在不需要编程的条件下可方便地依照应用逻辑构造不同行业需求的网络应用系统。     

高性能网络服务器框架的研究与实现

为构建面向海量数据和连接的互联网应用服务器,提出一种轻量级的高性能服务器开发框架LHP—Svrframe。除服务器开发框架的常用模块（如网络通信管理、自定义协议开发以及进程处理模型等）外,LHP—Svrframe特别提供针对TCP／IP通信协议和进程模型额外的优化设计,如对NIC网卡中断的负载均衡、拥塞窗口的动态调整、ACK延时机制的改进等。与Apache、Lighttpd、ACE等网络服务器或开发框架的对比结果表明,使用LHP-Svrframe开发的应用服务器在最大连接数和吞吐量上性能可提升4-8倍。     

基于UML的消防接处警系统开发建模研究

接处警系统作为城市消防通信指挥系统的核心组成部分,系统结构复杂,功能强大。统一建模语言UML是一种表达能力丰富的、强有力的建模语言。该文首先简要介绍了UML几技术及其在开发应用程序中的一般框架,并以此为依据,使用UML对接处警系统开发进行建模,给出了基于UML的接处警系统开发分析阶段描述。     

基于CORBA分布构件模型的应用服务器管理平台的研究与实现

本文在分析了CCM应用服务器管理意义的基础上，从StarCCM中间件系统结构特点出发，提出了StarCCMCM应用服务器层次式管理框架与管理模型，并介绍了在此基础上开发的StarCCM监控管理工具。通过StarCCM管理平台，可以实时地监控分布构件系统的内部运行状况，从而使得系统管理员可以有效地管理系统资源，调节系统性能参数。     

通过设计模式构造的通信应用服务框架

由于通信软件内在的复杂性，通信软件的开发者通常需要面对诸多挑战，而利用针对通信软件的设计模式可以帮助软件开发者克服困难，开发出高性能的通信软件。本篇论文将阐释我们是如何利用针对通信软件的设计模式来开发出一个基于Linux的通信应用服务器框架的。     

三层应用的核心——EAServer（一）

EAServer是Sybase公司出品的具有高度伸缩性、功能强大的电子商务解决方案应用服务器。本文会对EAServer丰富的功能和优秀的性能进行简要介绍。     

Chart Service中间件设计与开发

主要介绍了一种图形应用服务器（即Chart Service中间件）的框架设计、接口设计及其开发工程的构造模型。     

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.     

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.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。