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1.
针对卫星区域最优观测方案制定,将其抽象为集合覆盖问题和带附加条件的集合覆盖问题,在利用多星观测资源的情况下,提出了一种基于贪婪算法的解决方法,在该方法的基础上通过多次迭代求解来满足观测的实际需求。通过对该方法进行仿真实验,实验了不同条件下的求解情况,并对仿真结果进行了相关分析。  相似文献   

2.
融合了轻量级虚拟化、全虚拟化以及SDN技术的OpenStack云平台具有逼真度高、可扩展性强等优势,可有效满足网络仿真的大规模、高逼真、灵活构建的需求。在网络仿真层面,OpenStack的neutron机制支持三层网络高逼真仿真,可为各虚拟设备的无缝通信提供便利,但其虚拟路由器qrouter只能够转发直连网络的数据,难以构建复杂的仿真网络。为此,基于OpenStack平台,提出了一种基于集中式路由引擎与分布式路由部署的路由仿真技术。实验表明,该方法不仅可以基于qrouter构建复杂的仿真网络,而且具有高吞吐量的优势。  相似文献   

3.
基于P2P的工作流系统符合工作流去中心化的发展趋势.目前,P2P工作流系统主要是基于非结构化P2P网络构建的.然而,非结构化P2P网络提供的泛洪或基于超级节点的中心化发现策略和中心化的负载分配机制无法满足大型P2P工作流系统在动态环境下的需求.因此,在基于非结构化P2P网络构建的工作流系统中,节点发现和任务负载均衡成为制约系统性能的关键因素.文中提出一种新的基于结构化P2P网络的工作流系统节点定位网络--SAN-EBON.该系统采用分层逐步求精的节点发现策略,外层在服务聚类的基础上首次在工作流系统中引入服务定位网络组织服务联盟,构建一种新的多层结构化P2P网络SAN,实现服务的快速发现;内层构建一种新的负载均衡网络EBON,使用基于随机图的增强算法实现服务联盟内部实时的去中心化负载均衡,与SAN结合,从而达到提高发现效率和精度、降低通信带宽的目的.  相似文献   

4.
Vega中的传感器模块在红外成像仿真中的应用   总被引:1,自引:0,他引:1  
针对红外成像制导系统仿真对红外场景的需求,提出一种基于Vega中传感器模块的红外成像仿真的方法。介绍红外成像仿真的原理及研究现状,阐述传感器模块的特点和功用。给出了红外图像实时生成系统的组成及工作流程,较为详细地阐述了红外成像仿真的流程,重点阐述了红外传感器仿真模块、传感器视效模拟模块在红外成像仿真中的应用并给出了仿真结果。实验证明,该方法能够满足实际任务对图像仿真逼真度和实时性的要求。  相似文献   

5.
网络蠕虫实验环境构建技术研究   总被引:2,自引:1,他引:1  
网络蠕虫实验环境可以为蠕虫研究提供有效的实验分析支持.在系统分析解析模型、报文级模拟、网络仿真、混合方法等蠕虫仿真环境构建技术的基础上,提出了虚实结合的蠕虫仿真模型.该模型综合了报文级模拟和网络仿真技术的优点,具有良好的扩展性和逼真度,为构建灵活可扩展的蠕虫实验环境奠定了重要基础.  相似文献   

6.
本文提出了基于固态传感器的航姿系统设计方案,介绍了基于四元数的航姿求解方法,设计了多传感器融合的卡尔曼滤波器。仿真结果表明,该算法在保证精度的同时能有效地估算出陀螺漂移。以TMS320F28335处理器为核心构建了硬件系统。实验结果表明,该设计能满足航姿系统对精度和速度的要求。  相似文献   

7.
作战目标仿真逼真度分析方法研究   总被引:1,自引:0,他引:1  
针对作战目标构建需求的不断增长,仿真技术成为作战目标构建的重要手段。由于用户对作战目标的逼真度的评估要求越来越高,如何评估和提高逼真度是作战目标构建中迫切需要解决的问题。为了提高逼真度分析方法的科学性,提出了一种作战目标仿真逼真度分析方法。首先,在分析逼真度的概念和内涵的基础上,提出了适用于作战目标逼真度分析流程。然后,研究了逼真度分析的要素分解和指标标准化的指标聚合方法,最终形成了一套科学、可行的逼真度分析方法,对于作战目标仿真逼真度分析和作战目标构建均有指导意义。  相似文献   

8.
开发仿真系统首先要做的一项工作就是明确仿真目的,并在此基础上,确定仿真的可信度要求和逼真度需求.逼真度需求就是仿真需求中基于逼真度描述的、仿真与仿真对象相似程度的需求.合理确定逼真度需求是仿真系统开发成功与否的关键.该文解释了逼真度需求的具体含义,分析了确定逼真度需求需要综合考虑的三个基本因素,即技术因素、成本因素和可信度要求,论述了三者之间的相互关系.  相似文献   

9.
四旋翼飞行器飞行过程中具有非线性和强耦合性,导致难以建立精确的物理力学模型,针对这个难题,提出了基于多个ARX模型四旋翼飞行器的LQR控制器设计方法;ARX模型全称是带外生变量的自回归模型,LQR控制器一种基于局部线性化模型的无限时域预测控制器;该法首先基于四旋翼飞行器的动力学特性构建四旋翼飞行器多个ARX的模型结构,并利用结构化非线性参数优化方法辨识模型参数,获取满足工程精度需求的四旋翼非线性动态模型;然后,基于该模型给出了具有状态反馈的LQR控制器设计方法,并通过求解工作点的Riccati方程,获得状态反馈矩阵,最后通过仿真和实时控制结果验证了所提方法的有效性和可靠性。  相似文献   

10.
针对能量收集无线网络中的服务质量(QoS)保障问题,提出了面向统计QoS的最优功率分配方案,从而最大化时延QoS约束下的有效容量。首先,构建能量收集无线网络的有效容量最大化问题。其次,利用凸优化理论求解出最优功率分配方案以及该方案下的最大有效容量,并得出了两种特例下的最优功率分配方案,即:当QoS需求非常松弛时,最优化功率分配方案收敛于注水策略;当QoS需求非常严格时,最优化功率分配方案收敛于信道反转策略。然后,求解了所提最优功率分配方案得到的信道中断概率。最后,通过仿真实验,检验了该最优功率分配方案的性能。实验结果表明,与现有策略相比,所提方案能够获得更大的有效容量。  相似文献   

11.
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.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
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.  相似文献   

13.
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。  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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  相似文献   

17.
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.  相似文献   

18.
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.  相似文献   

19.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

20.
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.  相似文献   

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