民机故障预测与健康管理系统顶层架构设计技术研究

民机故障预测与健康管理系统顶层架构是指对民用飞机故障预测与健康管理系统的顶层技术和相关的应用体系结构及功能的顶层定义,该架构设计的主要研究容包括机上故障预测与健康管理系统技术架构、地面故障预测与健康管理系统技术架构、基于故障预测与健康管理技术的航空公司运营支持架构以及相关的通信体系架构等。该技术研究是通过对民用飞机故障预测与健康管理系统应用体系的顶层架构及相应的功能的详细定义,明确了民用飞机故障预测与健康管理系统顶层架构各组成部分所承载的功能和性能及接口关系;本论文的研究成果可以作为民用飞机故障预测与健康管理系统研制的基础和规范,同时对其他军用航空设备的故障预测与健康管理项目的研究也有一定的指导意义。     

ATML在综合运载器健康管理系统中的应用

综合运载器健康管理(IVHM)技术是提高飞机、航天飞行器安全性、可靠性及可维护性并有效降低成本的重要途径。针对IVHM系统的高互操作性以及复杂数据交换特点,提出采用自动测试标记语言(ATML)对航空机载设备进行形式化和规范化描述,有利于实现系统的高度集成以及可扩展性,结合航空电源故障诊断与预测系统的实例,论述了ATML在综合运载器健康管理系统中的应用。     

基于数字孪生的火箭测试与发射过程健康管理技术研究

为了解决运载火箭对地面测试与发射过程中对数据综合分析能力,飞行过程的故障诊断和预测能力,以及故障处理措施的快速决策等能力的迫切需求,提出一种基于数字孪生技术的火箭测试与发射过程健康管理系统设计方案;该方案通过建立运载火箭测试与发射阶段数字孪生模型,实现对火箭测试和发射过程的天地镜像仿真,依托数字孪生模型,对运载火箭健康管理功能进行了设计和优化;利用真实火箭和数字孪生火箭的信息交互,可有效实现火箭测试过程数据分析、飞行过程协同诊断,以及故障处理决策支持等功能;该系统提高了火箭发射的可靠性,为火箭可靠飞行提供了技术保障;同时,该技术在运载火箭健康管理上的应用也面临一些关键技术还需要进一步突破和发展.     

金融数据保密系统密钥管理技术浅析

密钥管理是计算机网络安全应用的一个重要课题。本文着重研究密钥管理系统的一些相关技术，阐述目前广泛应用于金融数据保密系统中的密钥技术，分析具体的应用实例。最后，综合国内外密钥管理最新技术的发展，提出了改进方案。     

民用飞机多级健康状态评估技术研究

保障飞机安全高效地运行,不断提高飞机派遣可靠度是每一家航空公司需担负的责任和不懈追求的目标;民用飞机多级健康状态评估技术将充分利用各类工程数据、技术数据和可靠性分析数据,建立飞机技术派遣量化评估方法,甄选影响飞机技术派遣的主要参数,并通过对各参数进行权重分配,建立综合量化分析模型,针对专机、VIP及其他特殊航线运行要求,精准高效地为飞机的技术派遣提供决策依据,保证特殊运行航班的安全性以及签派可靠度;在航空公司机队的实际应用中表明,基于飞机多级健康状态的评估系统能够有效地提高机队的派遣可靠度和日利用率,具有重要的工程应用价值。     

高校体育场馆健身器械监控管理系统设计

在当今高校教育当中,对于学生身体素质以及健康的关注度也越来越高,这也对于学校体育场馆的建设和发展提出了更高的要求。而且随着计算机网络以及自动化程度的不断发展和加深,在各个领域都体现出了不俗的表现。综合以上的诉求以及对于管理系统智能化发展,设计出一种用于高校体育场馆建设器械监控管理系统,实现对各种器械的预算、评估、使用、保管等方面进行科学化、合理化、智能化管理。保证我国高校的体育场馆器械可以满足当前教育要求和学生的需要,以及对于器械的应用管理更加完善。通过对于检测分析,采用这种管理系统可以大大的减少高校体育场馆中各器械的保存率和丢失率。     

嵌入式操作系统μC/OS-Ⅱ在飞机汇流条控制器中的应用研究

以飞机供电系统中自动控制与管理为应用背景,以TMS320LF2407A控制器为核心构建的硬件系统作为硬件平台,对实时嵌入式操作系统μC/OS-Ⅱ在飞机自动配电系统中的一级配电中心汇流条控制器的应用的关键技术进行了研究,提出了一种新的汇流条控制器系统任务划分机制.同时对确定任务优先级的算法进行了分析,并给出了软件任务划分的原则、以及软件构架.μC/OS-Ⅱ在飞机汇流条控制器系统中的应用为飞机电源管理系统的综合自动化提供了一种新的发展思路.     

飞机变压整流器健康管理算法研究

变压整流器是飞机电源系统中的重要设备,可以使飞机供电系统不再配备直流发电机,变压整流器在飞机电源系统中应用非常广泛,将健康管理技术应用于飞机变压整流器对其故障进行提前预警,具有重要现实意义。在对12脉波变压整流器的原理进行分析后,得出变压整流器的绕组绝缘老化和电容老化是导致其系统老化的主要因素,通过变压整流器的模型,借助仿真数据对比分析,确定了与电容和绝缘绕组相关的系统外部老化特征参数;并通过高斯混合模型、马氏距离对数据进行分类,再通过训练BP神经网络实现对变压整流器健康状态的评估。     

大学宿舍网络管理系统设计与实现

近几年,随着社会和相关科学技术的不断发展,网络管理系统已经逐步应用到了人们生活和工作的方方面面。高等院校作为当代最新技术的发源地以及应用地之一,对于管理系统的应用是十分重视的。然而从调查中发现,当前很多高校的后勤,尤其是宿舍管理方面的网络管理系统还有待完善。有鉴于此,对大学宿舍网络管理系统的设计与实现进行了研究,旨在促进大学宿舍网络管理系统的发展。     

悬挂物管理仿真系统的设计与实现

悬挂物管理系统属综合航电系统中的一个子系统,它是航空电子系统和飞机外挂物之间的接口。悬挂物管理系统根据来自飞行员和航空电子系统的指令,对悬挂物进行管理和控制,为飞行员确定各种军械投放的程序。讨论了悬挂物管理仿真系统的设计与实现,主要探讨了系统设计、系统管理、硬件开发、软件开发以及整个系统的总线信息流管理,系统的设计是采用某型号飞机的总线拓扑结构,通过将该仿真系统和导弹发射装置交联起来,可以完成导弹系统测试。     

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.