机载网络数据实时处理系统设计

随着C919等大型飞机的出现,测试系统对机载实时处理系统提出了更高的技术要求;机载网络数据实时处理系统采用实时性较强的vxWorks开发环境,通过合理调配各个功能模块之间的资源,即合理分配线程来实时的完成所有功能;经过科研试飞验证,该系统具备3 000个参数的实时处理能力,系统运行稳定可扩展性强,满足目前大飞机机上测试系统数据实时处理任务的要求,对保障大飞机试飞科目的顺利进行具有积极的意义。     

一种多冗余遥测数据处理系统的设计

随着试飞任务的增多,试飞安全也是目前关注的重要因素,而保障遥测信号正常是试飞安全的重要手段。本文通过分析现有实时遥测数据处理系统所存在的问题,设计了一套新型的多冗余遥测数据处理系统,通过服务器和客户端交互网络信息数据,实现实时监控数据的最佳源选择,从而保证了遥测数据的正确和稳定,提高了系统运行的可靠性。     

面向试飞科目的iNET网络数据快速处理技术

在飞行试验领域中,基于iNET架构的网络化测试系统正逐步取代传统的PCM测试系统,成为试飞测试系统的主要架构。网络化测试系统激增的数据量对多科目数据处理提出了更高的要求。为了满足某型号飞机网络化架构的机载测试系统的数据处理需求,提了基于iNET架构的网络数据分析软件设计方案,采用基于内存映射的海量试飞数据读取技术;针对iNET架构网络数据包的特点,设计了数据包快速解析技术对参数时序进行统一;提出“整体—分流”方法,极大地提高了数据处理效率;制定Excel校线文件模版,提高校线录入效率。方案采用C++语言实现,利用模块化和多线程设计思路,对网络机载测试系统记录的数据进行分析处理。实际试飞处理结果表明,iNET网络数据处理方案具备良好的实时性、准确性、可靠性,满足某型号飞行试验多科目快速处理需求。     

飞行试验综合安全监控技术

在新型飞机飞行试验任务中,遥测监控技术是保证试飞安全,提高试飞效率的重要手段。针对目前地面实时监控技术面临的问题和挑战,提出采用基于故障树的多类型告警技术、试飞任务的嵌入式准实时数据处理技术及应急处置辅助决策技术等先进监控技术,引入试飞安全决策库理念,建立应急处置辅助决策机制,构建飞行试验综合安全监控系统,实现飞机各系统试飞状态监控和综合故障告警、复杂试飞科目的准实时计算评估和应急处置决策支持。实际飞行试验结果表明,应用此技术开发的综合安全监控系统,可以使试飞指挥员和工程师在第一时间及时准确地获取试验机故障告警、试飞科目评估结果和应急处置决策方案,极大地提高了试飞效率和安全性。     

一种新型的RS-422总线数据处理算法研究与实现

为了满足某型机试飞数据中新型RS-422总线参数的实时监控和事后数据处理需求,提出了针对该新型RS-422总线参数的算法设计和实现方案;通过分析该新型RS-422总线参数的通信协议及数据包格式,决定采用调整机载格栅中数据的帧结构排放以及重置带头中参数采样率的方式,实现了参数的解析及还原算法,并设计了相应的实时监控以及事后处理软件;该软件已经成功应用于该型机的飞行试验中,为飞机飞行安全监控以及事后数据处理分析提供了有力保障。     

智能化的试飞测试软件体系架构研究

针对航空飞行试验需求从单一的测试向以信息化为代表的空天地一体化发展,试飞软件体系结构的智能化必将是试飞测试技术研究的重要方向,首次提出了基于组态的智能化实时监控软件体系,分析了智能化试飞测试软件体系的架构和层次以及关键技术。采用图形元素可重构算法实现智能化实时软件系统平台,满足飞行试验设计开发目的,具有智能配置、健康诊断、简便操作、友好界面等特点,由该体系架构设计的实时监控软件已成功应用于运输机、C919机等型号的多架飞机试飞实时监控当中, 结果表明该体系架构运行稳定,提高了试飞工作效率,在确保试飞安全和保障试飞任务高质量完成发挥了重要作用。     

基于VxWorks的网络数据实时处理软件的设计与实现

机载实时数据处理可以大幅提高数据处理的效率。为满足机载网络化测试系统架构下的实时数据处理的需求,设计并实现了一种基于VxWorks的网络数据实时处理软件。该软件运行在多核嵌入式数据处理系统上,通过多任务并发执行的方法保证实时性。软件运行过程中利用零拷贝技术实时接收机载测试系统发送的网络包数据,然后按照自定义的文件格式存储原始数据,同时将需要处理的网络包存入数据处理缓存中,根据网络数据协议实时解析网络包数据,最后利用预留缓存的办法将处理结果写入结果文件。实践证明,该软件能快速接收并实时处理网络数据,同时将原始数据和结果数据进行存储,该方法有效提高了数据处理的效率,为飞行试验数据处理提供了新的途径。     

民机试飞遥测地面实时数据处理软件设计与研发

为了满足大型民机试飞实时监控的需求,针对遥测数据设计研发了一套实时处理软件,软件包含后端解析服务和前端显示软件两大部分;后端解析服务采用多线程调度技术,实现实时处理及数据回放等不同工作模式下IRIG 106 CH10数据的接收、PCM数据的解析和数据的实时存储;前端显示软件基于WPF框架采用MVVM设计模式开发,包括任务管理、参数配置、算法处理和数据同步等子模块;经实际测试,软件实现了国产某大型客机不少于8000个遥测数据和多路视频的实时解析、分析和转发,满足了试飞过程中的实时监控需求,为试飞任务的安全开展提供了有力保障。     

基于RTR的遥测数据实时处理软件的设计与实现

为了对飞行遥测数据进行实时处理,以Qt为软件开发平台,采用直接接收宽带遥测接收机(RTR)发送的网络遥测数据包的方法,结合机载测试系统的采集格式、参数测试信息、校准信息和ICD信息,完成遥测数据的实时解算、工程量转换和原始数据保存,同时将关心的参数物理量通过网络实时的发送给客户端监控软件,以供试飞工程师进行实时监控;实际试验试飞结果表明,此软件运行稳定和数据准确可靠,完全满足实时监控的需求,具有良好的实用性和发展前景。     

基于AFDX总线的飞机状态监控模块设计

为了实现飞机状态监控模块对机载高速AFDX总线网络海量数据的监控需求,分析机载网络构型,并从数据帧处理、文件管理和用户接口等几个方面对状态监控模块进行设计,通过中断和分级任务的相互配合,提出了两级筛选、三级缓冲的机制;使用专用地面数据分析工具对监控数据进行分析,结果表明此状态监控模块能够确保监控数据的实时捕获、处理和存储;经过验证,使用两级筛选、三级缓冲的机制设计的状态监控模块,可针对不同的任务配置不同的监控需求,能够实现飞机状态监控功能,符合设计要求,运行稳定。     

Only connect: teaching, technology and telesis

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.     

European Community policy and the market

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.     

一种自适应子融合集成多分类器方法

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。     

Avoiding semantic and temporal gaps in developing software intensive systems

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.     

Designing economic np control charts: A programmed simulation approach

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.     

The development of robot art

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     

Explanation and prediction: an architecture for default and abductive reasoning

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.     

Three Process Perspectives: Organizations, Teams, and People

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.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.