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航天测控系统容灾能力评估是建设航天测控容灾系统的关键环节.通过对航天测控系统容灾能力评估因素进行深入分析,建立评价指标体系,利用层次分析法(AHP)确定各指标的组合权重;利用模糊评判方法建立模糊评判模型,计算容灾能力的综合评判值并做出决策.按照以上方法评估,航天测控系统的总体容灾能力等级是“较强”,但在灾难恢复管理、灾难恢复规划及灾难恢复技术措施等方面还需提高.结果表明,通过将层次分析法和模糊评判方法相结合对容灾能力进行评估,可以为容灾建设提供合理参考依据. 相似文献
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航天飞行控制软件是一种具有高可靠性要求的软件系统,但是目前对航天飞控软件的可靠性还没有进行定量的度量和管理.尝试将软件可靠性的定量模型应用于航天飞控软件系统的测试过程.介绍了基本执行时间可靠性模型,提出了基于历史失效数据拟合的模型校准方法,讨论了基于基本执行时间可靠性模型的软件可靠性增长测试和可靠性检定测试. 相似文献
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航天测控软件是航天测控系统的重要组成部分,作为任务的关键性实时软件,其可靠性直接影响着整个测控系统的可靠性.长期以来,测控系统软件相对缺乏系统的可靠性测试研究.文中针对航天工程地面测控软件的特点及可靠性测试要求,综合考虑缺陷等级、输入域等因素,按照数学算法建立了基于输入域分类的实时软件的可靠性混合模型,并对该模型的实际应用进行了介绍.文中模型和测试算法对航天测控工程领域典型功能软件进行了可靠性测试,实验结果表明了该方法的可行性、有效性和易用性. 相似文献
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航天发射作为人类太空活动最为基础和最为重要的环节之一,是评判一个国家综合国力的重要指标,而航天发射系统运行安全性评估作为现代航天发射控制指挥与决策系统的核心,是保证航天发射安全运行的基础.首先,本文概述了现代航天发射系统,简要回顾了系统安全性研究发展历程,阐述了航天发射系统运行安全性评估的内涵.其次,通过综述航天发射系统运行故障检测与诊断、异常运行工况识别、运行过程安全分析与预测、安全性动态评估技术等方面的研究现状的基础上,总结出了航天发射系统运行安全性评估面临着系统极度复杂、决策风险性极大、先验信息少以及评估结果要求高准确性与实时性等方面的挑战.最后,本文对航天发射系统运行安全性评估有待研究的基础前沿问题进行了思考. 相似文献
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法院管理系统是实现案件受理、立案、案件审理、结案等流程为一体的综合管理系统,案件审理具有多样化的特征。本文运用工作流技术,设计并实现一个法院案件管理系统。该系统依据WfMC提出的工作流参考模型0,对案件审理过程进行任务、角色和权限的抽象,将案件审理过程中的案件受理、立案、审理、结案等通过工作流技术完美地整合在一起,满足了案件审理流程多样化的需求,提高了案件审理的效率。 相似文献
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Applying the common criteria in systems engineering 总被引:1,自引:0,他引:1
The National Institute of Standards and Technology has proposed using the common criteria and system-level protection profiles (SLPPs) to specify security requirements in large systems, such as those used in air traffic management. This article summarizes experience with SLPP and security targets for the US Federal Aviation Administration's National Airspace System. The authors review the FAA efforts, highlight the problems encountered, and offer suggestions for future work, calling for more research on linking systems, software, and security requirements engineering with SLPP; clearer ties between security specifications and system certification; and better guidance on the appropriate use of SLPP as a prerequisite to widespread use. 相似文献
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The air traffic management system in the USA is an example of a distributed problem-solving system. It has elements of both
cooperative and competitive problem-solving. It includes complex organizations such as Flight Operations Centers, the FAA
Air Traffic Control Systems Command Center (ATCSCC), and traffic management units at en route centers that focus on daily
strategic planning, as well as individuals concerned more with immediate tactical decisions (such as air traffic controllers
and pilots). The design of this system has evolved over time to rely heavily on the distribution of tasks and control authority
in order to keep cognitive complexity manageable for any one individual operator, and to provide redundancy (both human and
technological) to serve as a safety net to catch the slips or mistakes that any one person or entity might make. Within this
distributed architecture, a number of different conceptual approaches have been applied to deal with cognitive complexity
and to provide redundancy. These approaches can be characterized in terms of the strategy for distributing: (1) control or
responsibility, (2) knowledge or expertise, (3) access to data, (4) processing capacity, and (5) goals and priorities. This
paper will provide an abstract characterization of these alternative strategies for distributing work in terms of these 5
dimensions, and will illustrate and evaluate their effectiveness in terms of concrete realizations found within the National
Airspace System. 相似文献
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指纹图像质量评估是自动指纹识别系统(AFIS)中重要的一个环节,它将在对指纹图像进行分割、细化等预处理操作之前对图像质量进行评估,去除不满足要求的指纹图像以提高后续处理的鲁棒性。文章分析了现有的指纹采集细则,对有效面积、干湿、位置偏移、方向模糊等方面对指纹图像质量的影响进行探讨,对采集到的指纹图像质量进行质量评测,为图像的预处理提供质量较高的指纹图像。实验证明,该方法对不合格的指纹图像有较好的过滤效果,有利于提高整个指纹识别系统的效率。 相似文献
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Brandon Stark Calvin Coopmans YangQuan Chen 《Journal of Intelligent and Robotic Systems》2013,69(1-4):5-20
Unmanned Aerial Systems (UASs) have rapidly grown into a significant part of the world-wide aviation budget. However, regulations and official standards have lagged significantly. Within the U.S., there has been significant pressure to develop the regulations to allow commercial and governmental agencies to utilize UASs within the National Airspace System (NAS). The authors propose a concept of operation document that incorporates existing regulations and ensures an acceptable level of performance based on experience with a Personal Remote Sensing (PRS) Unmanned Aerial System (UAS). 相似文献
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多印痕指纹识别的数据融合技术 总被引:2,自引:0,他引:2
由于指纹图像中存在非线性变形和噪声干扰,当前的指纹识别系统不能满足某些系统要求保持很低的误接受率(FAR)的同时达到较低误拒绝率(FRR)的要求。提高识别性能的一个有效的方法是融合多个模板和多个指纹的数据融合技术。该文研究的一种多印痕指纹数据融合技术能够改善系统性能。通过实验证明了这种数据融合技术能够有效提高系统性能,可以使系统在保持低误接受率的条件下降低误拒绝率。 相似文献
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面向并行工程的产品开发工作流建模研究 总被引:4,自引:0,他引:4
工作流管理系统能够对并行工程概念指导下的产品开发过程提供有力支持。工作流建模是工作流管理系统的首要问题。文章从并行工程的P_PROCE模型出发,形式化的定义了产品开发的工作流模型。在此基础上,研究了产品开发工作流的建模方法,重点介绍了一种基于模板映射的工作流建模技术。文中还介绍了工作流建模系统的结构及其应用情况。 相似文献
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系统采用B/S架构。整个系统由六大模块构成,分别是人员基本信息管理模块、商品信息管理模块、连锁店管理模块、商品入库管理模块、商品配送管理模块、退出系统模块。整个系统能够独立运行,使用方便,能够及时地分析企业进销存情况,提高工作效率,能给企业带来更大的利益。 相似文献
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The demand for Unmanned Aircraft Systems (UASs) capabilities is rapidly increasing in the civilian sector. UAS operations, however, will not be carried out in the National Airspace System until safety concerns are alleviated. Among these concerns is determining the appropriate level of automation in conjunction with a suitable pilot who exhibits the necessary knowledge, skills, and abilities to safely operate these systems. This research examined two levels of automation: management by consent (MBC) and management by exception (MBE), in conjunction with pilot experiences while operating an unmanned aircraft simulator. The user experiences encompass three individual groups: pilots, air traffic controllers (ATC), and non‐pilot/non‐ATCs. Performance, workload, and situational awareness data were examined. Results show no significant differences among pilot experiences groups, automation strategies, or the interaction between these two. Limitations and design implications are discussed to help pave the way for future research. © 2011 Wiley Periodicals, Inc. 相似文献