动态访问控制技术的研究与应用

权限访问控制模块是每一个多功能管理信息系统所必有的最重要功能模块之一。通过权限访问控制可以增强应用系统的安全性,保护应用程序和后台数据。文中主要介绍了基于RBAC模型的动态访问控制机制,详细阐述了应用RBAC模型的设计思想和实现方法以及数据库设计,并且对RBAC模型的角色与角色、权限与权限之间的关系做了进一步扩展和细化,增强了RBAC模型的灵活性和安全性。文中提出的实现方案已成功应用于“黄陵县人事管理信息系统”中。     

基于X.509证书的授权管理中RBAC策略的研究

描述了基于角色的访问控制(RBAC)的策略以及基于策略的权限管理的系统框架,介绍了一个X.509权限管理模型及怎样来实现 RBAC,以及如何用XML设计网上交易系统权限管理的RBAC策略模型。     

支持偏序和同异步权限建模角色访问控制框架

角色访问控制（Role Based Access Control,RBAC）的应用提高了系统易用性和健壮性。分析了RBAC标准模型,指出其在细粒度和表达能力等方面的一些缺陷,结合UML对其重构,提出支持偏序权限建模的面向对象角色访问控制模型（Object Oriented Role Based Access Control,OORBAC）,基于该模型结合部分GoF模式设计了通用应用框架。与其他应用框架相比有着良好的通用性,支持权限关系的同异步及偏序关系表达,并在细粒度动态访问控制上具有更好的效率。     

运用RBAC策略实现权限管理

论文描述了基于角色的访问控制(RBAC)的策略以及基于策略的权限管理的系统框架,介绍了一个X.509[7]权限管理模型及怎样来实现RBAC,以及如何用XML设计网上交易系统权限管理的RBAC策略。     

动态访问控制技术的研究与应用

权限访问控制模块是每一个多功能管理信息系统所必有的最重要功能模块之一。通过权限访问控制可以增强应用系统的安全性，保护应用程序和后台数据。文中主要介绍了基于RBAC模型的动态访问控制机制，详细阐述了应用RBAc模型的设计思想和实现方法以及数据库设计，并且对RBAC模型的角色与角色、权限与权限之间的关系做了进一步扩展和细化，增强了RBAC模型的灵活性和安全性。文中提出的实现方案已成功应用于“黄陵县人事管理信息系统”中。     

基于RBAC的权限管理在Web中的设计与实现

访问控制技术在Web信息系统中已得到了大量应用。相对于传统的自主访问控制模型和强制访问控制模型,基于角色的访问控制（RBAC）具有降低授权管理复杂性、减少管理开销以及能提供与企业组织结构相一致的安全策略等优势。文章使用J2EE的框架Struts2设计并实现了基于RBAC的权限管理。     

可扩展信息系统基于RBAC的访问控制实现

随着信息系统复杂性不断增强,许多大型应用系统都具有动态性.本文通过分析基于角色的访问控制(RBAC)模型,在Struts、Spring和Hibernate集成框架下,给出了适合企业自身需求、全方位可扩展的动态自定制信息系统中基于RBAC模型的访问控制模块的实现方法,对模块的后台数据库设计和模块实现等关键技术进行了论述.     

数据备份系统中基于角色访问控制模型的研究

基于角色访问控制(RBAC)是一种方便、安全、高效的访问控制机制.文中分析了RBAC的基本思想和模型,然后介绍了用户角色分配和角色许可分配的基本方法,最后提出了在数据备份系统中运用RBAC实现用户权限管理的应用模型.并实现了标准建模语言UML的交互图描述RBAC的授权流程,从而使系统开发人员能深刻理解RBAC模型和建立基于角色的系统.     

数据备份系统中基于角色访问控制模型的研究

基于角色访问控制(RBAC)是一种方便、安全、高效的访问控制机制。文中分析了RBAC的基本思想和模型，然后介绍了用户角色分配和角色许可分配的基本方法，最后提出了在数据备份系统中运用RBAC实现用户权限管理的应用模型。并实现了标准建模语言UML的交互图描述RBAC的授权流程，从而使系统开发人员能深刻理解RBAC模型和建立基于角色的系统。     

支持角色双向继承的约束RBAC模型

针对经典RBAC(Role Based Access Control)模型在复杂应用系统中操作繁琐以及难以映射组织结构等不足之处,提出了一种支持角色双向继承的约束RBAC模型BI-RBAC。该模型对经典的RBAC模型进行扩展,增加虚拟角色及其层次结构以支持角色的双向继承,并定义资源操作的概念。给出模型的形式化定义的同时,设计了访问控制算法。模型在自主开发的大型平台软件钱塘中间件平台软件中得到了应用,可较好地支撑恒生证券交易系统等大型软件系统。     

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.