共查询到18条相似文献,搜索用时 116 毫秒
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考察了在不确定条件下的双边多议题协商中对Agent的效用建模的问题,给出一个引入了不确定因素的Agent的效用函数形式,更为准确地描述了不确定条件下Agent的偏好.提出了一个不确定条件下的自动协商模型,基于遗传算法设计了协商算法.仿真实验结果表明,该模型能够降低风险,改善Agent在协商过程中的决策效果. 相似文献
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基于身份加密体系的隐藏证书原始模型存在无法实现一对多的信息传输、对身份信息不具备容错功能且密文容易被共谋破解等缺点。提出的基于属性加密的隐藏证书扩展模型通过引入属性集合证书技术、基于加解密精度阈值等特性,解决了上述三个问题。在分析国内外相关研究进展的基础上,对扩展模型在体系架构、系统构造、双方信任协商协议、多方信任协商协议以及扩展模型解决复杂逻辑访问策略的方法等进行了详细的阐述,并对扩展模型的安全性进行了分析。通过一个典型的应用场景,对比分析了新旧隐藏证书技术在性能和安全性上的区别,阐明了扩展模型的优点。 相似文献
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本文将效用模型引入无线传感器网络的功率控制设计中,提出了一种基于效用模型的分布式功率控制机制(简称UMDPC).该机制建立了网络中所有传感器节点的功率与效用模型的对应关系,将链路可靠性、网络能耗归纳到统一的网络效用优化框架中,并证明该效用优化问题是凸优化问题,构造基于对偶分解的分布式的优化算法,获得网络效用最大化条件下各节点的优化发射功率.最后,通过模拟实验对所提机制及其实现算法的性能进行比较和评价.实验结果表明,本文所提机制最大化了网络的效用,提高了网络的能量利用效率. 相似文献
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Agent和多Agent系统(Multi—Agent Syste璐,简称MAS)正在成为人工智能研究实用化和在分布计算环境下的软件智能化的重要技术。协商策略是Agent协商的一个重要问题,选择有效的策略,可以有效地提高协商的效率。提出了一个策略选择算法,并以此为基础,在协商模型中运用预测结果,对协商模型进行了优化,使Agent在协商过程中能根据自己的需要来缩短协商进程,同时获得合理的收益,提高协商过程的可控性。最后通过实验证明了工作的有效性。 相似文献
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该文针对多信道无线mesh网络,采用基于效用最优的定价机制,提出了一种功率-干扰价格模型,并基于该模型提出了一种分布式联合信道分配和功率分配算法。每个节点根据自己所消耗功率状况合理地定功率价格,并根据自己所受干扰状况合理地定干扰价格。通过功率价格和干扰价格来调节链路的信道分配和功率分配,使网络效用最大化。仿真结果表明:所提出的算法能够快速、平稳地收敛到近似最优解。同时还仿真了网络可用信道数目、节点射频数目和功率对系统性能的影响,可以为网络配置提供参考。 相似文献
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本文基于凸优化方法,以提升网络效用与降低网络总功耗为目标,针对多无线多信道(Multi-radio Multi-channel)的多跳无线网络提出了一种联合速率控制与功率分配的跨层优化模型,并利用对偶分解方法设计了优化模型对应的分布式算法,证明了该分布式算法收敛性.该算法通过改变本征权的取值能够在网络效用与网络功耗之间取得折衷,并能根据速率要求动态调整各条链路的注入速率与发射功率使得网络达到效用与功耗的联合最优.通过仿真实验验证了该分布式算法可有效的调节网络效用与总功耗之间的平衡. 相似文献
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A method of task allocation and automated negotiation for multi robots was proposed. Firstly, the principles of task allocation were described based on the real capability of robot. Secondly, the model of automated negotiation was constructed, in which Least-Squares Support Vector Regression (LSSVR) was improved to estimate the opponent??s negotiation utility and the robust controller of H ?? output feedback was employed to optimize the utility performance indicators. Thirdly, the protocol of negotiation and reallocation was proposed to improve the real-time capability and task allocation. Finally, the validity of method was proved through experiments. 相似文献
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提出了一种第三方的授权服务模型,对现存的信任协商系统起到支撑作用.模型作为一个授权代理,在实体使用信任协商确定一个适当的资源访问策略后,可以在一个开放的系统中发布访问资源的令牌.模型的体系结构设计允许集成新的信任应用程序,也可以间接集成现存传统的应用程序.讨论模型、模型使用的通信协议的设计和实现,以及它的性能. 相似文献
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针对WMN中出现的安全问题,提出了利用WMN多径特性的密钥协商模型,可以在防止中间人攻击的同时发现网络中的变节节点。采用Petri网理论对模型结构特性及安全性进行形式化分析,对发现的漏洞给出解决方案。通过引入新的变节节点的检测安全模型和算法,使WMN的安全性得到增强。 相似文献
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We propose a framework for service level negotiation within s elf-management systems. The negotiation process occurs between high-level autonomic managers to guarantee an end-to-end service level for specific application traffic flows. In the proposed framework, we provide autonomic systems with a new interaction opportunity thanks to the negotiation with their peers. To be in conformance with the concepts of self-aware management systems, the proposed negotiation protocol called SLNP is used in a Web Services environment. 相似文献
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Cuihong Li Giampapa J. Sycara K. 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2006,36(1):31-44
We present a model for bilateral negotiations that considers the uncertain and dynamic outside options. Outside options affect the negotiation strategies via their impact on the reservation price. The model is composed of three modules: single-threaded negotiations, synchronized multithreaded negotiations, and dynamic multithreaded negotiations. These three modules embody increased sophistication and complexity. The single-threaded negotiation model provides negotiation strategies without specifically considering outside options. The model of synchronized multithreaded negotiations builds on the single-threaded negotiation model and considers the presence of concurrently existing outside options. The model of dynamic multithreaded negotiations expands the synchronized multithreaded model by considering the uncertain outside options that may come dynamically in the future. Experimental analysis is provided to characterize the impact of outside options on the reservation price and thus on the negotiation strategy. The results show that the utility of a negotiator improves significantly if he/she considers outside options, and the average utility is higher when he/she considers both the concurrent outside options and the foresees future options. 相似文献
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Kuo-Ming Chao Muhammad Younas Nick Godwin Pen-Choug Sun 《International Journal of Wireless Information Networks》2006,13(2):141-150
The popularity of grid services has widened their application to numerous domains and increased the utilization of computational resources. In order to create more incentives for the resources owners to lease their resources and prevent users from wasting the resources, the introduction of a market-oriented grid is inevitable. However, the issues for the negotiation between service provider and consumer over the supply and demand of resources can be complex, with highly interdependent issues. In this research, a simulated automated negotiation mechanism including a co-evolutionary mechanism and a modified game theory approach is proposed, to assist them in reaching an agreement over the conflicting issues. In the proposed architecture, the co-evolution process is able to reduce the multiple dimensional search space into a two-dimension search space and identify the appropriate negotiation strategies for the negotiating agents to form a payoff matrix which can be used for the game theory related stage of their interaction. The multiple stage negotiation process is introduced to improve the negotiation result. In this paper, an application which requires a large amount of computational resources to process the data generated from mobile devises is used to demonstrate that the proposed system is able to resolve the conflicts and obtain a valid solution. 相似文献
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针对传统跨域密钥协商协议安全性不足问题,提出一种新的跨域量子密钥协商协议。在无证书密钥协商体系下,采用量子密钥协商与经典密码算法结合的方案,提高了协议适应现有通信网络架构的能力。密钥协商过程使用三粒子量子隐形传态,利用量子态不可克隆定理保障协商过程中密钥的安全性。与其他方案相比,本协议具有较高的量子比特效率,并且可以抵抗中间人攻击、重放攻击等多种内部和外部攻击手段。 相似文献