基于软件代理的应用系统安全性设计与实现

文章以国际结算应用信息系统ISDMSv1.0中的安全系统为应用背景,分析了信息系统的安全性问题,强调了系统的网络安全管理问题,设计并实现了一种基于软件代理和安全套接层协议SSL(SecureSocketLayer)的数据安全传输系统。对该系统的两个主要组成部分:客户方安全代理NS-Agent和服务器端安全网关NS-Gateway,进行了详细介绍,并分析了实现中的若干关键技术。该方法被证明较好地解决了信息系统网络环境中的安全问题。     

A Negotiation Enabling Agent Based Infrastructure: Composition and Behavior

Software agent-based negotiation is a major method to automate the interactions in electronic marketplaces and Internet enabled communities. The traditional approach is to let the agents to interact directly. In this paper it has been investigated how a mediator agent can improve the chances to reach the agreement via bargaining. Although the ideal mathematical model was proposed in the seventies, this was never implemented as a working mechanism, due to the fact that the mediator needed information that was difficult to gather and the usual environment was not repetitive enough to consolidate this information for a fair mediation. The agent-based infrastructure proposed collects continuously data about the negotiating parties and the mediator agents use this data to reduce the exaggeration of the parties. The paper includes a mediation example and the major conclusion is that negotiation is improved by a mediator which has historical data about the negotiating parties.     

Efficient Agent-Based Selection of DiffServ SLAs over MPLS Networks Within the ASP Service Model

The demand for QoS provisioning support over Internet grows continuously. One of the factors contributing to this demand is the increasing penetration of Application Service Providers (ASPs) to the market. This necessitates the development of mechanisms for the efficient realization of Service Level Agreements (SLA). In this paper, we develop and evaluate an approach for efficient SLA selection and implementation (support, policing/shaping, and charging) in a DiffServ-over-MPLS network domain. We describe how this approach is applied in a realistic service provision scenario based on the ASP service model. A negotiation process between a user and a network provider is introduced; thus the user can choose from the alternative options for allocation of resources the one that better matches his needs. For the purposes of negotiation, we develop an appropriate utility model that expresses user preferences in a simple yet informative way. Furthermore, we discuss the implementation of our approach in a small-scale experimental DiffServ-over-MPLS network, for the case of a simple scenario of ASP services provision. We also assess the economic efficiency of our approach by means of simulation experiments, the results of which advocate that our approach is incentive compatible, in the sense that individual optimization by each user (in SLA selection) also leads to improved social welfare. Our approach is quite general and can be combined with several policies for network management, or as a complement to the traffic engineering procedures.     

基于流量控制的网络实时定价计费系统

介绍了一种基于流量控制的实时网络定价计费模型，该模型通过价格协商确定网络使用费率。讨论了如何使用该模型实现计费代理服务器，并给出了相应计费系统的设计与实现。     

基于Web的NSA和NSS集成的商务洽谈系统

商务洽谈是解决电子商务冲突的最好方法之一。该文研究和讨论了基于Web的集成商务洽谈的两大实现技术：洽谈软件代理NSA和洽谈支持系统NSS，并给出了一个基于Web的NSS和NSA集成的商务洽谈系统框架。     

基于JADE平台的Multi-Agent协商的设计与实现

Multi—Agent协商是目前研究的一个热点,而从底层开发出一个Multi—Agent协商系统是非常复杂和困难的。该文在研究JADE仿真平台技术的基础上,对基于JADE仿真平台的Multi—Agent协商进行了设计与实现,为研究Multi—Agent协商有着重要的意义。     

一种基于上下文协商的动态服务组合方法

普适计算的计算环境和交互信息动态变化,为了提供适时适地的服务,服务组合除了满足用户的需求之外,还要适应环境的变化.以面向普适计算的分布式文档管理系统为例,提出一种基于上下文协商的动态服务组合方法,适应普适计算环境下资源动态变化的特点,同时满足用户对服务的需求.首先定义上下文和带有上下文信息的服务模型;然后给出服务和设备以及服务和用户之间的上下文协商约束条件,根据约束条件提出基本算法实现服务动态组合,并对基本算法进行优化;最后通过原型系统和实验验证算法的性能和有效性,并通过实验数据分析上下文对于服务组合的影响.实验数据说明:提出的方法能够应用在普适计算环境中上下文敏感的服务组合问题上,提高服务组合的动态适应性和网络资源利用率.     

供应链环境下基于库存约束的多agent协同谈判研究

建立了供应链环境下的多agent协同谈判模型,用于制造商同时与多个下游企业进行动态谈判。对谈判的基本要素进行了描述,探索了这种谈判的具体流程,并提出了一种基于库存约束的谈判策略,最后用原型系统进行了验证。因为协同谈判是在整体的库存约束条件下进行的,谈判结果也是经过管理agent从整体的观点进行评估后形成的,所以制造商在履行订单协议时,不会发生内部资源冲突,提高了订单的履行率。     

基于多智能体的虚拟企业环境下自治agent的协商

讨论了基于多智能体(Multi-agent)的虚拟企业环境下自治agent的协商,针对虚拟企业环境下协商的特点,提出了虚拟企业环境下自治agent的协商通用形式化模型,并在模型的基础上给出了一系列协商策略与协商战略.使用这些策略与战略不仅可以帮助agent生成建议与反建议,而且可以帮助agent对收到的建议做出评价,以作为生成反建议或终止协商的依据.     

Combined Negotiations in E-Commerce: Concepts and Architecture

Combined Negotiations are a novel and general type of negotiation, in which the user is interested in many goods or services and consequently engages in many negotiations at the same time. The negotiations are independent of each other, whereas the goods or services are typically interdependent. Using currently available technology for electronic negotiations, the user conducts each negotiation separately, and has the burden of coordinating and reconciling them. The inherent complexity of combined negotiations in B2C as well as B2B e-commerce calls for software support.In our research, we aim to devise a Combined Negotiation Support System (CNSS) to help the user conduct all the negotiations at the same time. The CNSS enables the user to control and monitor the progress of the negotiations, makes sure that the specified dependencies are respected, and applies user-defined strategy rules. We have designed such a CNSS which we call CONSENSUS. The architecture of CONSENSUS relies on workflow technology, negotiating software agents, and rule engine technology. The originality of this architecture lies in the fact that the user of CONSENSUS models the combined negotiation at build time using a workflow that captures the sequencing of the individual negotiations and the dependencies between them. At runtime, software agents are assigned to individual negotiations, and they participate in the combined negotiation as actors in the workflow. The user can monitor the progress of the combined negotiation as a whole, and the progress of individual negotiations via dedicated graphical user interfaces. We rely on rule engine technology to enable the agents to use negotiation strategies.The paper introduces combined negotiations with a usage scenario. Then, combined negotiations are detailed, along with the approach taken to cope with their complexity. Afterwards, we describe the functionality a CNSS should provide, and present the architecture of CONSENSUS, together with a discussion of the underlying concepts and technologies. Furthermore, we report on our prototype implementation of CONSENSUS and illustrate it with an example. A discussion of related and future work concludes the paper.