兵棋推演中地形量化算法研究与实现

传统手工兵棋推演计算机化的一个重要方面是实现兵棋棋盘的计算机化.需要借助于计算机实现兵棋棋盘的数字化并对兵棋地图进行地形量化.兵棋推演系统采用不同大小的六角网格量化地形,将兵棋推演系统与地理信息系统组件MapX结合.在MapX中显示兵棋推演区域的Maplnfo格式地图数据,并提出了一种基于MapX的六角网格绘制算法,算法充分利用MapX中图元与组合图元的思想,可以根据推演需求实时生成不同比例尺的六角网格覆盖整个或部分作战区域,降低了手工兵棋地形量化的工作量,对提高兵棋推演效率有一定的意义.     

一种基于网格延展法的等值线生成算法

已有等值线生成算法研究存在算法复杂、不健壮,实现难度大,或与应用系统集成难度大,应用不灵活等问题,以雨量等值线生成算法为例,介绍一种基于网格延展法的等值线生成算法。基于网格延展法的等值线生成算法,通过网格延展法实现等值面的提取,并使用一种简单的方法实现等值线平滑计算,整体等值线生成算法简单、易于实现;基于规则网格进行空间插值计算,对研究区域数据点分布具有很强的适应性,算法表现出较好的健壮性;无须进行等值线边界裁剪计算,也无须考虑等值线追踪时出现的分叉、连通域等问题,可大大减少等值线生成的计算量,降低等值线算法的实现难度;同时计算过程多数是对二维数组的操作,可以使用多种计算机语言实现,具有较好的生产应用价值。     

基于粒度计算和覆盖算法的信号样式识别

文章提出应用粒度计算和神经网络覆盖算法对通信信号的调制样式进行识别。采用数字信号处理方法,从已调信号中提取信号关键特征以及它们的统计值作为样本特征集。根据不同调制信号的特点,粗粒度处理训练样本形成新的学习样本并以此构造一个覆盖神经网络。然后利用得到的覆盖领域,进行样本识别。对粗粒度类别样本利用样本的关键属性进行投影区分。通过大量的仿真数据验证,此方法对通信信号样式识别取得了很好的效果。     

等值线图的彩色填充方法

文中提出了一种实现等值线彩色填充的新方法，该方法不需要进行等值线的追踪，只需要经过网格化的数据，并且填充算法的计算量不随着绘图区域的扩大而增长，程序实现比较容易，数值计算量小。文中给出了具体的算法，同时也展示了利用该算法得到的图形的实例。     

迭代最近等值线算法在水下地形辅助惯性导航中的应用

迭代最近等值线算法是一种重要的匹配导航算法,文中首先介绍了算法的基本原理,随后在某区域真实地形数据库的基础上,利用迭代最近等值线算法进行仿真计算得到最佳匹配位置。并提出将匹配位置误差作为观测量,用Kalman滤波对惯导系统误差进行最优估计。由最后的仿真结果可以看出,迭代最近等值线算法可有效抑制惯导纬度误差的增长。     

基于MapX的高程获取方法在巡航导弹CGF中的应用研究

针对模拟战场中巡航导弹CGF态势显示和信息交互的需要,提出了基于MapX的高程获取方法.首先介绍了巡航导弹的航迹模型,给出了数据准备过程及MapX的数据结构,重点研究了基于MapX的高程获取方法,用于获取等高线的高程值,并在此基础上研究了等高线间高程的插值方法.仿真实例表明,基于MapX的高程获取方法能快速得到高程数据,且保证了一定精度.     

一种适合于复杂电磁环境下短波跳频信号的检测方法

分析短波波段复杂电磁环境下跳频信号检测存在的难点,并根据短波通信信号的特点,提出一种时间、频谱和幅度关联的检测方法,称之为时频幅三维关联法.文章主要结合商空间粒度分析理论,提出改进的覆盖聚类算法,并对截获的海量复杂数据进行预处理,消除了噪声,然后运用时频幅三维关联法,排除定频信号、突发信号等.实验结果说明该方法能够有效地检测出跳频信号,验证了方法的实效性.     

最小权点覆盖下的智能电表通信故障区域预警方法

电表通信故障预警可以保证智能电表的通信安全,有利于实现对智能电能表的全过程质量管控。但是,智能电表的工作轨迹具有随机性,跟踪难度较大,其故障变量信息的提取难度较大。为此,提出了基于最小权点覆盖的智能电表通信故障区域预警方法。利用智能电表运行状态的观测向量作为故障检测的关键变量,计算出运行状态观测向量的平均轨迹。根据智能电表通信故障数据变量在不同时刻的运行轨迹,提取出智能电表通信故障的关键变量信息,完成智能电表通信故障的检测。在最小权点覆盖下,采集智能电表通信故障数据。利用Fisher准则,计算出智能电表通信故障属性的重要程度,通过设计智能电表通信故障区域预警算法,实现智能电表通信故障区域的预警。实验结果表明,研究方法可以成功预警智能电表通信故障,通过较高的预警准确率确保了智能电表的稳定运行。     

通信台站覆盖预测及三维显示

研究通信台站覆盖预测及其优化显示的问题.传统的战场通信台站覆盖预测与地形显示并没有有机结合起来,并且通常是二维显示,不仅信息量少,而且很不直观.为优化覆盖预测与显示,基于战场地形高程等地理数据,实现了战场地形的三维再现.结合台站信息和地理信息数据,利用ITU-R P.1546电波传播模型,进行了台站覆盖预测及在三维地形上的显示.仿真结果表明系统三维效果显著,能够比较客观、形象地反映通信台站覆盖.在战场实际使用过程中,设计的系统可以为指战员呈现逼真、直观的战场通信状况,可大大提高制定作战方案能力和效率.     

基于MapX的无人机气象探测显示系统的设计与实现

利用面向对象设计语言VC+ +和ActiveX控件MapX设计开发了无人机气象探测显示系统,实现了无人机飞行航迹的电子地图显示、重要飞行参数的数据显示和气象参数的数据图形显示,可用于实时监视和事后回放分析.探讨MapX的二次开发技术,对MapX在类似系统中的开发有参考价值.     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.