改进的粒子群算法在弹体分类中的应用

以沈阳军区某部“超声波弹体内部成份探测系统”为课题背景,利用低能量超声对弹体进行探测,并基于神经网络对捕获数据进行分析,以此来确定废弹的具体类型,提出一种混沌变异粒子群优化算法（CMPSO）。该方法将神经网络的参数优化和权重优化融合入一个统一的框架之中,充分利用粒子群算法寻优能力强、收敛速度快的特点。相对于一般的神经网络结构优化算法,具有设置参数少、计算复杂度低的特点,最后将提出的算法应用于弹体分类问题之中取得了十分显著的效果。     

移动机器人多传感器信息融合测距系统设计

介绍了用于移动机器人运动导航的多传感器测距系统的硬件组成和数据融合方法.测距系统由超声波测距模块、红外测距模块和数据融合模块组成,超声波测距模块和红外测距模块分别检测机器人周围环境中障碍物的距离,数据融合模块则通过SMBus总线收集两个模块采集到的距离数据,并采用自适应加权数据融合算法对这些数据进行处理,以获得可信的距离信息.实验表明,所设计的测距系统可靠性高、配置灵活,能够满足机器人自主导航中的避障要求.     

多源复合型弹药无损检测系统设计

针对弹药内部损伤特征差别较大,难以使用一种射线源成像进行无损探伤的问题,提出了一种双焦点射线源融合成像方法和系统。介绍了系统总体结构组成和软硬件设计方案,同步控制电路对两种射线源进行集中控制和焦点切换,智能控制终端对多自由度机械操作平台全方位操控,超声波自动测距装置对焦距进行精准调整。图像采集处理软件采用基于曲波变换的自适应图像增强方法,对常规焦点和微焦点射线图像进行增强和匹配;利用缺陷图像自动识别算法实现缺陷的智能辅助识别。应用结果表明,该系统对弹药内部不同部位、不同尺寸的损伤均具有很好的成像检出效果。     

旋转弹用MEMS惯性测量组合数据硬回收系统设计

针对常规弹药在高温、高压、高过载等恶劣发射环境和弹体狭窄尺寸限制下,传统的弹载数据记录器无法可靠工作并无法安装等问题,提出了一种新型的适用于MEMS惯性测量组合数据硬回收系统的设计方法。该系统采用数字信号处理器控制高速模数转换芯片,将采集到的MEMS惯性器件输出模拟量转化为数字量后存入FLASH存储器中,实现对弹体整个飞行过程中相关飞行参量的准确记录。通过对某次靶场实验数据记录和显示,该系统能够完整地记录弹体飞行过程中的参量数据,具有小型化、抗高过载、采样率高、噪声输出小等优点,对常规弹药发射、飞行以及着地全过程的姿态、位置信息的动态测量有一定的工程应用价值。     

弹体毁伤机场跑道的数值仿真

论述了用基于AUTODYN的动力学分析有限元程序对弹体毁伤机场跑道靶板过程进行数值仿真.阐述了数值仿真模型的建立,以及利用数值模拟技术,实现了毁伤过程中弹体的变形与靶板的破坏状况可视化,同时对仿真结果进行了分析,并进行了实验验证,仿真结果与实际情况基本相符.并且还分析了不同打击条件下弹体对机场跑道靶板的毁伤情况.通过对弹体毁伤机场跑道过程的数值仿真,为开展弹药的毁伤效能评估以及准确预计机场跑道的抢修任务和保障力量准备提供数据支持.     

标度变换技术在弹载数据采集系统中的应用

对标度变换技术进行了介绍,并基于某弹载数据采集系统的研制过程,给出了利用标度转换技术对弹体表面压力传感器信号的处理方法.建立了传感器输出信号与模数转换数据之间的对应关系,并利用活塞式压力计对数据处理结果进行了验证.给出了采用此压力传感器取得的弹射试验相关监测参数的记录曲线.结果表明:由压力传感器和弹载数据采集系统组成的测量装置完全能够再现弹体外部压力变化.     

基于微小型弹体的姿态控制系统的设计

现代战争的快速发展要求弹药具有高精度、高灵敏度及高可靠性,常规弹药智能化成为各国研究的方向,姿态控制作为飞行器控制系统的重要部分,对飞行器提高性能具有重要作用.基于微小型弹体姿态控制系统以FPGA为核心控制单元、四象限探测器为信息反馈单元、舵机为基本执行机构、尾翼为最终响应部件完成了设计.并进行了发射实验,实验表明该设计对弹体的姿态控制效果明显:在发射距离为10m、尾翼偏角为30°情况下平均偏转可达0.80°.为主动式激光制导技术在微小型高速运动体中的应用奠定了基础,具有广阔的应用前景.     

弹药步进应力寿命试验数据处理

弹药的步进应力加速寿命试验数据处理的关键是异常数据的处理和弹药长贮寿命分布参数的估计.针对这两个问题,人们提出了许多相关解决办法,但迄今为止,尚没有一种通用的、行之有效的方法.为此,尝试依据贝叶斯理论对试验中可能出现的数据异常进行预处理,并利用鲍维尔法先求取各级加速应力下的样品分布参数的似然估计,再结合加速方程得到常应力下弹药的贮存寿命分布参数.最后,通过实例说明了方法的可行性.     

移动机器人多传感器信息融合技术探讨

本文对移动机器人多传感器信息融合技术进行了分析,并采用自适应加权融合算法对多超声波传感器数据与红外传感器数据进行融合。     

弹体底隙超声检测方法研究

为了检测出弹体装药与内锥面之间底隙的有无,以确保弹体的战斗性能,本文在超声波传播过程中声通量守恒原理的基础上,根据弹体结构的特殊性,提出一种利用超声波检测弹体内锥面底隙的方法。通过人工弹体底隙的检测和对多种型号弹体的实测,表明该方法能够有效地分辨出底隙和脱胶的有无。该方法对其他锥面上脱粘缺陷的检测具有借鉴意义。     

凹凸科技进军网络安全领域

2006年2月28日,网络安全及电源管理芯片供应商凹凸科技(O2Micro)向中国用户隆重推介凹凸科技在网络安全领域的独特理念和全新方案.此举标志着凹凸科技已正式进军网络安全领域.特别在ASIC防火墙和SSL VPN技术和产品的竞争中,凹凸科技已经担负了不可或缺的重要角色.而其在模拟与数字集成电路方面拥有的强大设计和制造能力,无疑将为其最终成为全球网络安全领域的主要供应商增加关键筹码.凹凸科技在评述中国安全市场发展趋势的同时,还将携两款最具代表性的成熟产品--ASIC防火墙SifoWorks和SSL VPN产品Succendo一起亮相.     

2006 Sun科技日在中国举行——"Java之父"James Gosling再来中国

继成功举办2005年Sun JAVA中国开发者大会之后,Sun一年一度全球规模的开发者大会——2006Sun科技日又分别于今年9月23～24日和27～28日相继在中国上海和北京两大都市举行“。Java之父”James Gosling再次来到中国,与中国的开发者讨论软件开发者所关心的问题,讲述Sun的软件发展策略、介绍Solaris10操作系统的独特的特性和新的Java开发工具、展望Java技术发展前景,特别是阐明Sun实施Java技术开源的策略。Sun科技日是Sun公司最重要的全球开发者的大会,它针对Java技术、Solaris10OS、NetBeans、OpenSolaris、开源技术、开发工具和Web…     

陕西省第一届国防科工系统内网安全研讨会召开

2006年3月15日,“陕西省第一届国防科工系统内网信息安全建设专题研讨会”在西安市隆重召开。此次会议的议题是,在当前的信息安全形势下,陕西省国防科工系统内网面临的信息安全问题,以及如何采取有效的解决方案进一步提高国家机要部门内部网络的安全保护等级,以适应形势发展的需要。此次会议由陕西省国防科工委主办,陕西省国防科工委信息中心和北京榕基网安科技有限公司、北京理工先河科技发展有限公司、陕西金叶西工大共同承办,国家保密局和陕西省国防科工委的有关领导出席会议并发表了重要讲话。在为期两天的会议中,共有100多名国防科工系…     

IT in teacher training in France

Abstract To understand what is going on in France at the moment in the domain of computers and related communication technologies in teacher training, there are two major developments that have to be kept in mind. Firstly, the ways of becoming a teacher in France underwent major changes in 1991. It is therefore too early to come to general conclusions about the effects of this reform in the field of new information technologies. Secondly, French IT in schools policy has shifted from a large-scale centralized equipment operation, which provided microcomputers in each school from 1985 to 1987, to a more regional management of equipment funding, with less national piloting in the field. This paper describes what happened during the previous period and what is taking place now. With matters still evolving the paper represents a snapshot rather than an exhaustive survey; such a survey remains to be done.     

Teacher education in IT in Germany

Abstract In 1988 the eleven West-German Kultusminister , with responsibility for the school systems in their respective Bundeslaender , reached agreement with the Federal Ministry of Education and Science on the broad concept of 'Information and Communications Technology', ITG. After four years of discussion it was agreed that ITG should be introduced into the secondary level of the general schools. In spite of strong disagreements about the ways and speed of implementation, and after several years of experiments, important parts of the concept have become a reality in practically all of the old Bundeslaender. While acknowledging the complexity of the German educational system the paper attempts to outline the development of the concept of Information and Communications Technology and its consequences in teacher education. The development in the eastern part of Germany, the former GDR, has been completely different to that in the western part and this is also commented upon in the paper.     

IT in teacher education in Scotland

Abstract This paper outlines the consensual approach to the formulation of curriculum policy in general, and in relation to information technology (IT) in particular, in Scotland. It outlines the approaches to IT that have emerged as a result. These are founded on the premises that all children should develop knowledge and understanding about IT and skills in using IT; that IT should influence both content and delivery of the curriculum; and that IT (computing studies in Scotland) should be an elective for secondary school pupils. Against this background, the paper describes the evolution of policy and practice relating to IT in teacher education. It appraises the strategies which institutes are using for developing the professional skills necessary to deliver IT in the Scottish curriculum. It notes significant progress but highlights the need to develop strategies which integrate IT more deeply with other professional studies so that student teachers develop deeper, more reflective approaches to IT.     

Recent developments in ergonomics in China

Ergonomic thought and practice were introduced in ancient China in relation to modern developments in Chinese ergonomics. Despite the ten-year interruption of the 'cultural revolution’ in the late 1960s and 1970s, ergonomics has made great progress in China in the last decade. In this paper some general developments in recent ergonomics’ teaching and in professional organizations are described. Four major areas of ergonomics research are illustrated: (1) Visual displays and signal design; (2) Human-computer interface with Chinese computers; (3) Cognitive strategies and decision support; (4) Mental workload and occupational stress. The main characteristics of Chinese ergonomics are discussed and new directions are highlighted, based on recent developments and progress.     

沈阳市城市表土中微生物区系变化的初步研究

在沈阳市远郊-近郊-市区等不同城市化水平区内选取林地、草地和路边土几种不同利用方式下的表层土壤,对土壤中的微生物状况进行了初步分析。结果表明,随着城市化水平的提高,土壤中微生物的数量表现为明显的减少趋势。其中变化较大的是细菌,而真菌和放线菌的变化不明显。     

Informatics in teacher education in Japan

Abstract This paper charts the developments in information technology (IT) policies in education in Japan over the past decade with particular emphasis on the impacts on teacher education. Beginning with the work of the National Council on Educational Reform in 1985, the Japanese education system initiated a thorough analysis of the role of information technology in all aspects of education from kindergarten through to high school, vocational education and pre- and in-service teacher education. The various approaches culminated in guidelines and statutory requirements relating to both schools' curricula and teacher training, published in the period 1990–1992. More recently other ministries have contributed to developments including the Ministry for International Trade and Industry which has categorized the different types of information engineers and among these is the new Educational Engineer. The paper reports the processes leading to these developments.     

IT in teacher education in Denmark

Abstract As with many European countries Denmark is experiencing change in teacher education and most notably in the wake of an act of government in 1992 which was designed to set out common aims for teacher education. Prior to that the content and structure of teacher education had been highly specified including, for example, the requirement that student teachers should take a course of 42 hours IT-related lessons. This paper provides a brief history of the background to the changes in teacher education and focuses on the implications that the more flexible aims for teacher education have for the future integration of IT in teacher education.