火箭橇弹射救生试验测试技术现状及发展趋势

通过查阅大量国内外飞机弹射救生文献资料和实施多次火箭橇弹射救生通道清理试验,对火箭橇弹射救生试验测试技术进行了系统梳理,从光学图像测试和力学测试这2个方面对通道清理、座椅弹射、氧气供给、人-椅分离、乘伞下降和安全着陆这6个试验分系统凝练试验测试内容,并按测试对象进行相应测试方法介绍,提出未来火箭橇弹射救生试验测试将朝着火箭橇平台高超声速试验能力、飞机变姿态试验和测试系统智能安全小型化的方向发展。     

侧面碰撞过程中乘用车座椅安全性仿真分析

针对在乘用车侧面碰撞过程中座椅失效是假人损伤主因之一的情况,对带有原始座椅的某乘用车进行侧面碰撞仿真分析.结合试验,找出原始座椅在侧面碰撞中在乘员保护方面所存在的问题.针对该问题,设计一套座椅挡板,通过仿真得出挡板高度对侧面碰撞中假人损伤的影响,确定合理的座椅优化改进方案.     

单级异步感应电磁推进器优化研究

为满足小型无人机起飞要求,选择异步感应电磁弹射系统为研究对象。建立单级异步感应电磁弹射器系统模型并应用Maxwell进行仿真分析。搭建了电磁弹射系统仿真试验平台,对影响系统发射性能的参数应用参数优化法进行分析,得到与系统最佳匹配的结构参数,试验结果表明该电磁弹射器可以满足小型无人机的起飞要求,优化设计异步感应电磁弹射系统,降低了系统的复杂性。     

弹射通道动力学仿真设计

传统的弹射通道设计手段局限于地面弹射实验,成本高,难控制;而动力学仿真与之相比具有成本低,零风险,设计周期短等明显优点。以多体动力学仿真软件LifeMOD为平台,建立了人椅系统的多刚体动力学模型,仿真分析了弹射出舱阶段三种不同工况下人体模型肢体的运动轨迹;以各点轨迹形成的包络面为边界,获得了满足安全要求的最小弹射通道尺寸,可以为弹射通道设计提供必要的指导。     

弹射救生系统通用模块化仿真模型

工作于应急离机状态的弹射救生装置是一个复杂的动态系统,其工作环境复杂、不确定因素多。如何利用仿真技术来研究系统的动态特性一直是仿真工作的难点。该文提出了一种在弹射救生仿真通用平台上利用系统建模技术,将弹射救生划分为三个阶段,分阶段建立模型,复用此算法模型,通过各模块输出,输人变量名的连接方式,建立弹射救生仿真模型。针对不同型号的弹射救生仿真,只需要建立和修改各模块的控制模式类即可完成整个建模过程,不需要用户编制和修改算法源程序,并在仿真试验研究的基础上提出了弹射救生系统仿真的今后发展的重点。     

座舱压力控制器测试系统设计

文中介绍了一种基于PXI模块化设计的数字化座舱压力控制器的测试系统。该测试系统具备对座舱压力控制器进行平台级测试的能力,可用于座舱压力控制器的调试,试验及验收工作。测试系统在设计中,采用了可配置的模块化设计思想,可通过全仿真、半仿真、全实物测试等不同的测试方法来对应不同的测试场景,可选择不同的硬件激励设备及不同的软件功能组件进行功能组合,对于提升测试性指标,完善座舱压力控制器在调试、试验、验收等各个环节的测试工作具有重要的意义。     

注入式红外成像仿真系统设计

根据红外成像系统的仿真试验需求,设计并实现了一套128像素×128像素的注入式红外成像仿真系统。详细介绍了注入式红外成像仿真系统的设计方案,论述了硬件系统的关键技术和实现方法,介绍了软件实现方案和系统调试方法。试验测试结果表明,模拟图像的帧频达到100 Hz,单元像素的灰度分辨率为16-bit,精度达14-bit。经实际使用表明此系统满足设计指标要求。     

基于GPS的弹射试验测试装置的研究

论述了基于SuperstarⅡ GPS-OEM板弹射试验测试装置软、硬件实现方法．对主要硬件电路的设计进行了分析，阐述了Superstar Ⅱ OEM板数据形式和数据结构，并给出了OEM板原始数据采集处理及存储软件流程。它的实现将为我国研究弹射座椅救生性能的测试试验提供一种新的手段和方法。     

飞机弹射筒弹射过载信号采集仪的研究与开发

针对国内飞机弹射筒地面弹射试验的试验情况,开发一套基于C8051F120单片机的弹射筒弹射过载信号采集仪。介绍该系统硬件和软件的设计方法及工作原理,重点对系统电路的设计进行论述并基于PROTEUS7.6平台进行电路仿真;软件开发基于LabWindows/CVI虚拟仪器平台,功能合理,人机交互好。应用结果表明,该采集系统运行稳定可靠,精度高,具有一定的实用性和推广价值。     

柴油机电控系统软件仿真测试系统研究及应用

针对柴油机电控系统软件系统测试的必要性和难度,设计了基于d SPACE平台的电控系统软件仿真测试系统。介绍了仿真测试系统的软硬件结构及工作流程,对如何建立通用柴油机模型,通用试验,如何通过Automation Desk设计测试用例并实现自动化测试进行了研究。试验结果表明,该仿真测试系统对电控系统软件系统测试具有很好的实效性。     

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.