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将P2P架构和Web服务技术引入综合电子信息系统,提出了以P2P技术构建基础服务平台,利用Web服务开发和封装功能模块或分系统,采用资源本地化管理手段实现Web服务的注册、发布和查找。最后开发了Web服务管理平台原型系统并在实验室环境下进行了运行和可行性验证。该新型综合电子信息系统具有节点对等、无中心、自组织和易扩展等优点。 相似文献
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基于WEB服务的行业信息可视化模型研究 总被引:1,自引:0,他引:1
WEB服务是为解决电子商务问题而提出的,它的以服务为核心的观念也是解决其它领域问题的新思路,针对行业信息可视化系统,分析了其可能存在的主要问题,并应用WEB服务的概念构造了一种解决模型,通过建立服务适配器、注册中心以及能实现WEB浏览的服务请求者,实现行业信息可视化系统的低成本、可持续性发展。 相似文献
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为解决Web服务资源框架(Web Service Resource Framework,WSRF)在服务开发过程中工作量大、服务难以动态部署的问题,提出并设计了资源服务化平台,实现了计算资源自动服务化封装。平台提供访问资源的统一服务接口,由资源管理模块将用户请求映射为对实际资源指定方法的调用,且资源可以动态地部署和撤销。测试实验表明:在该平台下,资源服务化开发效率显著提高,而服务性能未明显下降。 相似文献
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对象智能建模、模型调用管理等是水下平台作战推演系统设计与开发过程中的难点问题。基于OODA环指挥控制描述模型,刻画了水下平台作战推演的业务流程和功能,采用Web服务和Agent建模技术,建立了一种基于Web服务和多Agent技术的水下平台作战推演系统体系结构,有效地解决了作战推演模型的智能性、重用性和扩展性等问题,并给出了智能体建模的程序框架,对水下平台作战推演系统的设计与开发等具有重要参考价值。 相似文献
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根据通信设备及其网络的特点和通信业务训练的要求 ,提出了层次化结构的仿真训练模型 ,并提供和分析了各层建模方法和编程技术。然后介绍了通信设备及其网络仿真训练系统的典型实例 ,结果表明 :该模型对于建立通信设备及其网络仿真训练系统具有易于代码开发、易于理解、易于维护管理、易于系统功能扩展的特点。 相似文献
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E. G. Coffman 《海军后勤学研究》1969,16(2):175-197
Most operating systems for large computing facilities involve service disciplines which base, to some extent, the sequencing of object program executions on the amount of running time they require. It is the object of this paper to study mathematical models of such service disciplines applicable to both batch and time-shared processing systems. In particular, Markov queueing models are defined and analyzed for round-robin and foreground-background service disciplines. With the round-robin discipline, the service facility processes each program or job for a maximum of q seconds; if the program's service is completed during this quantum, it leaves the system, otherwise it returns to the end of the waiting line to await another quantum of service. With the foreground-background discipline each new arrival joins the end of the foreground queue and awaits a single quantum of service. If it requires more it is subsequently placed at the end of the background queue which is allocated service only when the foreground queue is empty. The analysis focuses on the efficiency of the above systems by assuming a swap or set-up time (overhead cost) associated with the switching of programs on and off the processor. The analysis leads to generating functions for the equilibrium queue length probabilities, the moments of this latter distribution, and measures of mean waiting times. The paper concludes with a discussion of the results along with several examples. 相似文献
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针对OPNET网络仿真软件不能体现短波天波传输特点的问题,分析了短波天波传输信道的特性,给出了天波传输方式下的路径长度和传输损耗的计算方法。介绍了OPNET网络仿真软件和ITS短波信道模拟软件,结合信道计算方法和软件仿真原理,分析了两种软件在短波网络仿真中的契合点,提出了基于两种软件联合的短波网络仿真方法。通过将联合仿真方法在短波网络性能分析中的应用,得到的结果能够体现短波信道特点,说明该联合仿真方法能够为OPNET软件下的短波网络仿真提供较真实的短波信道环境。 相似文献
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Jon Strandquist 《Small Wars & Insurgencies》2017,28(2):337-360
Foreign policy program transfer, the shifting of implementation responsibility for a foreign policy program from one organization to another, is a ubiquitous, yet under-studied, counterinsurgency phenomenon. This article conceptually develops program transfer as an important object of study; analyzes, using archival sources, an empirical case of program transfer, Operation Switchback, drawn from US counterinsurgency practice in South Vietnam; and formulates two preliminary theoretical claims related to program transfer: (1) transferred programs will tend to be altered in accordance with the characteristics of the gaining organization, and (2) program transfer may act as a signal or early-warning indicator of foreign policy change. 相似文献
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We study a service design problem in diagnostic service centers, call centers that provide medical advice to patients over the phone about what the appropriate course of action is, based on the caller's symptoms. Due to the tension between increased diagnostic accuracy and the increase in waiting times more in‐depth service requires, managers face a difficult decision in determining the optimal service depth to guide the diagnostic process. The specific problem we consider models the situation when the capacity (staffing level) at the center is fixed, and when the callers have both congestion‐ and noncongestion‐related costs relating to their call. We develop a queueing model incorporating these features and find that the optimal service depth can take one of two different structures, depending on factors such as the nurses' skill level and the maximum potential demand. Sensitivity analyses of the two optimal structures show that they are quite different. In some situations, it may (or may not) be optimal for the manager to try to expand the demand at the center, and increasing skill level may (or may not) increase congestion. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2012 相似文献
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蔡琦 《海军工程大学学报》1994,(4)
服役年限是核舰艇可靠性要求的一个组成部分,影响其确定的一个主要因素是核动力装置反应堆的堆芯寿期。本文讨论了堆芯寿期与核舰艇服役年限的关系,在分析核燃料消耗的影响因素基础上建立其估计模型以供服役年限与堆芯寿期进行权衡,最后参考军情况,提出堆芯寿期的确定原则。 相似文献
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In this article, we introduce staffing strategies for the Erlang‐A queuing system in call center operations with uncertain arrival, service, and abandonment rates. In doing so, we model the system rates using gamma distributions that create randomness in operating characteristics used in the optimization formulation. We divide the day into discrete time intervals where a simulation based stochastic programming method is used to determine staffing levels. More specifically, we develop a model to select the optimal number of agents required for a given time interval by minimizing an expected cost function, which consists of agent and abandonment (opportunity) costs, while considering the service quality requirements such as the delay probability. The objective function as well as the constraints in our formulation are random variables. The novelty of our approach is to introduce a solution method for the staffing of an operation where all three system rates (arrival, service, and abandonment) are random variables. We illustrate the use of the proposed model using both real and simulated call center data. In addition, we provide solution comparisons across different formulations, consider a dynamic extension, and discuss sensitivity implications of changing constraint upper bounds as well as prior hyper‐parameters. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 460–478, 2016 相似文献
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分析了SUPANET VPN的协商流程,提出了2种隧道的建立模式,构建了SUPANET VPN拓扑结构,利用网络仿真软件OPNET对VPN—QoSNP协议进行了仿真,并验证了协议的正确性和可行性。 相似文献