试验训练使能体系结构(TENA)的进展与应用情况

未来的作战与训练概念高度依赖于以网络为中心的作战能力,美国国防部认为迫切需要在试验与训练领域建立一种能克服当前“烟囱式”设计、实现靶场资源之间互操作、重用和可组合的新技术。美军借鉴了多种体系结构的研究和应用成果,构建了试验训练使能体系结构(TENA)。本文对TENA的进展、在美军靶场中的最新应用情况及未来发展方向进行阐述,并描述了针对我国靶场资源现状所带来的启示。该体系结构将为未来开发精细强大的试验和训练系统提供必要的支撑。     

一种能量均衡的ZigBee网络路由算法

为进一步改善Zig Bee网络性能以及延长其网络生命周期,提出一种能量均衡的路由算法EARZ(an Energy-balance Routing algorithm for Zig Bee networks)。算法通过改进传统算法的数据传递路径,来调整网络的能量消耗。算法中,源节点和目的节点根据建立的节点能量警告值来选择合适的路径,在平衡网络能量的基础上使路径最短。对算法进行了仿真和实验测试,结果均表明算法比典型的路由算法AODVjr更能有效延长网络的生命周期。     

Spring中AOP的连接点检测器

越来越多的系统开始使用AOP(面向切面编程),面向切面编程越来越重要,但是AOP的连接点丢失问题一直未能很好的解决,该文针对使用Spring框架的系统中日志生成业务设计了一种连接点检测器,可以遍历所有连接点,并在数据库中维护连接点状态。     

主成分分析法在学生成绩分析中的应用

本文从大学四年成绩的真实数据入手,利用主成分分析法,建立了数学模型,然后给出各主成分的得分函数,并结合成绩进行分析,最后得出影响成绩的主要课程,并验证了学校实行的学分绩是合理的。该研究结果为今后的教学研究和管理提供了科学的依据。     

气动激励装置原型机磁共振弹性成像研究

介绍:磁共振弹性成像是一种无创的对生物组织的生物力学特性进行定量分析的新技术。在诸多外部机械激励方法中,气动激励装置因其磁兼容性好而相对被广泛使用。本研究搭建了一台气动装置原型机并测试了该装置在不同频率和振幅条件下的性能。材料和方法:使用超声方法测试气动激励装置原型机在无负载条件和不同频率和振幅情况下的性能,并在磁共振弹性成像环境测试该原型机在有负载条件下的性能。结果:生物组织的弹性值与外部激励的频率和振幅、生物组织的机械力学特性以及传导管的长度和内径有关。结论:稳定可靠的机械波是磁共振弹性成像中准确可靠地重建组织弹性值的保障,气动激励装置的机械激励参数应根据不同生物组织的特性进行优化,以保证弹性值重建的可靠性。     

Studying single nanocrystals under high pressure using an x-ray nanoprobe

In this report, we demonstrate the feasibility of applying a 250-nm focused x-ray beam to study a single crystalline NbSe(3) nanobelt under high-pressure conditions in a diamond anvil cell. With such a small probe, we not only resolved the distribution and morphology of each individual nanobelt in the x-ray fluorescence maps but also obtained the diffraction patterns from individual crystalline nanobelts with thicknesses of less than 50 nm. Single crystalline diffraction measurements on NbSe(3) nanobelts were performed at pressures up to 20 GPa.     

基于Skyline软件的三维Web系统设计与研发

本文讲述基于Skyline软件的三维web地理信息系统的解决方案。重点阐述了WEB可视化技术,以及如何利用Skyline系列软件在在网络环境下搭建一种三维地理信息系统,包括Skyline系列软件中Terra Builder的建模过程和调用Terra Explorer pro接口的过程。     

High‐order sliding mode control design based on adaptive terminal sliding mode

High‐order sliding mode control techniques are proposed for uncertain nonlinear SISO systems with bounded uncertainties based on two different terminal sliding mode approaches. The tracking error of the output converges to zero in finite time by designing a terminal sliding mode controller. In addition, the adaptive control method is employed to identify bounded uncertainties for eliminating the requirement of boundaries needed in the conventional design. The controllers are derived using Lyapunov theory, so the stability of the closed‐loop system is guaranteed. In the first technique, the developed procedure removes the reaching phase of sliding mode and realizes global robustness. The proposed algorithms ensure establishment of high‐order sliding mode. An illustrative example of a car control demonstrates effectiveness of the presented designs. Copyright © 2011 John Wiley & Sons, Ltd.     

Human eyebrow recognition in the matching-recognizing framework

This paper studies the problem of automatically recognizing human eyebrows using a frontal view. In the matching-recognizing framework for image-based object classification, we design an automatic human eyebrow recognition system via fast template matching and Fourier spectrum distance. Fast template matching is used to locate the target subregion of a gallery template or a pure eyebrow image in a probe original eyebrow image, whereas Fourier spectrum distance is used to determine the final identity of the probe original eyebrow image. We conducted a number of experiments to demonstrate the efficacy of the proposed system and corroborate the validity of eyebrow recognition on the BJUT eyebrow database. Moreover, we also tested the system on the color FERET database. Experimental results show that our approach can be directly applied to face recognition by only replacing eyebrow templates with face templates, and may achieve higher accuracy in eyebrow recognition than in small face recognition. This is a strong argument for eyebrow recognition to replace face recognition as an independent biometric in certain scenarios, especially where relatively large eyebrows can be cropped.