Linear reconstruction measure steered nearest neighbor classification framework

The linear reconstruction measure (LRM), which determines the nearest neighbors of the query sample in all known training samples by sorting the minimum L₂-norm error linear reconstruction coefficients, is introduced in this paper. The intuitive interpretation and mathematical proofs are presented to reveal the efficient working mechanism of LRM. Through analyzing the physical meaning of coefficients and regularization items, we find that LRM provides more useful information and advantages than the conventional similarity measure model which calculates the distance between two entities (i.e. conventional point-to-point, C-PtP). Inspired by the advantages of LRM, the linear reconstruction measure steered nearest neighbor classification framework (LRM-NNCF) is designed with eight classifiers according to different decision rules and models of LRM. Evaluation on several face databases and the experimental results demonstrate that these proposed classifiers can achieve greater performance than the C-PtP based 1-NNs and competitive recognition accuracy and robustness compared with the state-of-the-art classifiers.     

基于GML的公共交通数据建模

文章分析了目前的交通信息系统的建模方法及其存在的问题,结合GML3.1、GML模式和线性参考方法,研究了使用GML对公共交通数据模型的几何和拓扑关系建模的方法。以城市公共交通模型为开发实例,给出了基于GML的郑州市公共交通的建模方案和具体实现方法,并使用XSLT技术将最终结果可视化。     

基于LRM的航空电子系统BIT研究

随着我国新型航空电子系统的加速发展,航空电子系统综合度和复杂度越来越高,以LRM为基础的综合航空电子系统将成为主要的发展方向,这为系统的测试和维修提出了更高的要求。而LRM的BIT技术是其中一项非常关键的技术,在研究基于LRM的航空电子结构和LRM组成的基础上提出了LRM内部3级组合BIT方法,并对该方法做了较详细的描述。该方法在LRM的设计以及功能改进过程中,可以提高LRM的自检测能力,降低BIT实现难度。     

综合因素对模块封装设计的影响

讨论了综合模块化航空电子系统中影响现场可更换模块(LRM)封装的各个关键要素,重点分析了这些要素间的关联性,以及外部因素对模块封装的综合性影响.同时,对国內新一代飞机平台上的航空用LRM封装标准化提出了一些看法和建议.     

中国东部典型地幔岩中包裹体成分研究及意义

运用激光拉曼探针对中国东部地区新生代几个典型的玄武岩中橄榄岩包体和大别山—胶南造山带出露的超高压变质岩—榴辉岩包裹体的气液相成分进行了详细的测定,得出几个基本结论：(1)地幔流体中含有较高的气相组成,其中以无机的CO₂、CO、N₂、H₂S为主;(2)地幔岩包裹体成分的不均一性反映了其源区的不均一性和地幔的交代作用;(3)在个别地幔岩包裹体中还检测到高含量的CH₄和H₂。上述事实表明中国东部郯庐断裂系统地幔深处可能蕴藏丰富的二氧化碳气体、烃类气体和其它可燃性的气体资源。本研究对中国东部地幔流体组成和无机成因的非烃气（特别是CO₂气）成因和成藏的可能的探讨提供了重要证据。     

一种军用LRM模块的新型插拔装置

为了解决LRM模块尤其是液冷LRM模块在安装箱内快速安装和拆卸、满足日益苛刻的短时维护雷达的需求,实现雷达外场二级维护要求,设计了一种军用LRM模块新型插拔装置。插拔装置由两部分组成：锁紧机构和锁定器。锁紧机构安装在LRM模块的前面板上,锁定器安装在模块安装箱上,通过两者之间的压接和分离实现LRM模块在安装箱上的快速安装和拆卸。     

液冷现场可更换模块LRM热设计

本文主要介绍了液体透流式现场可更换模块ＬＲＭ的研制背景,过程,实验方法及冷却性能分析,为高功能密度电子设备的热设计提供有效的指导方向,及为今后的热设计提供可靠的工程指标。     

Multi-Rate Access Schemes for MC-CDMA

In order to accommodate different types of traffic in future wirelesscommunications, it is necessary to consider a system, which can operatesatisfactorily at multiple transmission rates. Due to its capability to copewith the hostile frequency selective fading, that limits transmission rate,and its suitability to handle multi-rate data, multi-carrier CDMA (MC-CDMA)has recently drawn considerable attention as a suitable candidate forsupporting multimedia services in wireless communications. Multi-rate accessschemes where users are able to transmit at different data rates on MC-CDMAsystems are presented in this paper. Four multi-rate access schemes: uncodedfixed spreading length (UFSL), coded fixed spreading length (CFSL), multi-codefixed spreading length (MFSL) and variable spreading length (VSL) schemes areproposed. With these schemes, different traffic such as voice, video and highrate data can be transmitted seamlessly through one MC-CDMA infrastructure.A chip-level minimum mean square error combining (MMSEC) technique is employedfor joint energy combining and interference cancellation purpose. Theperformance of these schemes with MMSEC is compared by both theoreticalderivations and simulation results under frequency selective Rayleigh fadingchannels.     

楔形锁紧装置的研制

本文介绍了应用于LRM（现场可可换模块）的楔形锁紧装置的研制背景、原理、结构组成及在工程中的应用。     

楔形锁紧装置振动传递作用的实验分析

为研究楔形锁紧装置对振动载荷的传递作用,构建了用于研究其振动传递作用的实验装置,通过实验获取了该装置在X、Y和Z 3个方向上的随机振动响应数据,并引入2个量化指标对所得实验数据进行了比较和分析。结果表明,在不同方向上楔形锁紧装置表现出不同的振动传递作用,主要结论有:楔形锁紧装置在不同实验方向上具有不同的振动传递作用,在X方向上有衰减作用,在Y方向上几乎等值传递,在Z方向上具有放大作用;楔形锁紧装置的拧紧力矩大小仅对高频段的传递曲线产生影响,不同方向上所影响的频段范围稍有不同;在自由拧紧状态下楔形锁紧装置的振动传递作用与采用0.010 N·m的力矩拧紧时最为接近。