基于Wireless USB技术的遥控设备设计

针对近距离无线遥控领域的需求,依托Wireless USB技术,提出一种基于软件无线电、认知无线电理念的半双工多功能遥控设备的设计思想,并在设计通用模块的基础上,制作了原理样机.软件设计在充分应用射频芯片既有功能的基础上,增加纠错编译码、频率捷变等功能,提高了系统可靠性.对原理样机完成了工程实现,实验证明达到预期目标.     

支持远程唤醒功能的3G移动视频监控系统的实现

设计了一个用服务器转发方式实现的基于3G网络的移动视频监控系统,设备端通过PPP移植后实现与3G网络的连接,监控设备采集到的视频经由服务器转发在手机客户端上进行实时浏览.同时针对昂贵的流量费用问题,为系统设计实现了3G远程唤醒功能,用户可以通过手机短信来远程控制监控设备与3G网络的连接与断开.     

基于私有云的远程视频监控系统设计

提出了一种基于私有云的远程视频监控系统的方案.首先对该系统的总体结构进行了分析和阐述,然后对视频采集节点和私有云存储服务器的硬件结构进行设计,并在Linux2.6内核下开发远程视频监控软件系统,实现视频数据采集及压缩编码、私有云存储和网络传输等功能.实验结果表明,该系统在不同的网络环境下均能够显示稳定、清晰的视频图像.     

空间相机光学窗口热光学性能的仿真分析

 空间相机光学窗口与周围环境进行热交换,导致窗口的温度发生不均匀变化,包括整体温度水平的变化以及产生径向温差、周向温差和轴向温差。这些温度梯度将影响相机的光学系统质量。针对某相机光学窗口温度分布不均匀的特点,提出利用非顺序光路建立复杂光瞳的方法对光学窗口进行分区,在各子区域上建立温度的径向分布特征,然后将各子区域的变化再统一到整个元件中,进而评判对整个系统的影响。结果表明,新方法合理可行,温度周向不均匀分布会降低光学系统质量,并且不能完全通过离焦来补偿。     

多角度偏振遥感相机DPC在轨偏振定标

为了做好卫星数据应用的技术储备,多角度偏振遥感相机DPC航空预研版已经研制成功并完成了航空飞行实验. DPC相机用于获取地气系统反射的偏振、多角度的太阳辐射信息,其地气物理参数反演依赖于定标的精度. 偏振相机的辐射定标包括强度和偏振两个方面. 本文研究偏振遥感相机的偏振参数的在轨定标原理与方法. 基于偏振遥感相机的设计原理,以相机的偏振辐射模型为基础,探索偏振定标的原理和方法. 使用DPC航空遥感实验数据,初步实现了在轨偏振定标并对定标结果进行了分析. 为将来我国自主星载偏振遥感数据处理和在轨偏振定标提供 关键词： 偏振定标 遥感 在轨定标 DPC     

An isomer-specific high-energy collision-induced dissociation MS/MS database for forensic applications: a proof-of-concept on chemical warfare agent markers

Spectra database search has become the most popular technique for the identification of unknown chemicals, minimizing the need for authentic reference chemicals. In the present study, an isomer‐specific high‐energy collision‐induced dissociation (CID) MS/MS spectra database of 12 isomeric O‐hexyl methylphosphonic acids (degradation markers of nerve agents) was created. Phosphonate anions were produced by the electrospray ionization of phosphonic acids or negative‐ion chemical ionization of their fluorinated derivatives and were analysed in a hybrid magnetic‐sector–time‐of‐flight tandem mass spectrometer. A centre‐of‐mass energy (E_com) of 65 eV led to an optimal sequential carbon–carbon bond breakage, which was interpreted in terms of charge remote fragmentation. The proposed mechanism is discussed in comparison with the routinely used low‐energy CID MS/MS. Even‐mass (odd‐electron) charge remote fragmentation ion series were diagnostic of the O‐alkyl chain structure and can be used to interpret unknown spectra. Together with the odd‐mass ion series, they formed highly reproducible, isomer‐specific spectra that gave significantly higher database matches and probability factors (by 1.5 times) than did the EI MS spectra of the trimethylsilyl derivatives of the same isomers. In addition, ionization by negative‐ion chemical ionization and electrospray ionization resulted in similar spectra, which further highlights the general potential of the high‐energy CID MS/MS technique. Copyright © 2011 John Wiley & Sons, Ltd.     

Conditional privacy-protection remote user authentication mechanism for WBAN

A conditional privacy-protection remote user authentication scheme based on a certificateless group signature was proposed,which can accomplish the anonymous mutual authentication between the user and the remote doctors.In addition,when the doctors perceived that users were in case of an emergency,the mechanism enabled the only group manager (GM) to expose the real identity information of users and given users timely assistance.The scheme can provide the anonymity,traceability,mutual authentication,non-reputation and some other security features.The performance analysis results show the scheme is more suitable for WBAN.     

Data leakage prevention system based on transparent encryption for mobile terminal equipment

With the trend that enterprise key data moves to mobile terminal,data leakage prevention has become an im-portant issue on mobile terminal.To solve the problem,a pre-decryption transparent encryption technology was set up which solved the problem that traditional transparent encryption technology only can ensure application layer security,in addition,performance on mobile was improved.At the same time,taking advantage of the idea of combining thin client and mobile terminal to prevent leakage of data,a virtual remote desktop technology on mobile was proposed,which completely shield the shortcomings of data transmission and ensure the safe transmission of mobile terminal data.Finally,a data leakage pre-vention system for mobile terminal was set up,which makes the mobile terminal fully and effectively protected.     

基于AT2042的嵌入式网络视频监控系统的设计与实现

为了实现中小场合对于视频监控设备的低成本和网络化的需求,设计了一种基于ARM-S3C2410、音视频硬件编解码芯片AT2042的嵌入式网络视频监控系统,该监控系统实现了MPEG-4编解码器,能实现本地的海量存储、远程控制以及运动检测的功能。用户通过在个人计算机(PC)端输入网页服务器的因特网协议(IP)地址来访问服务器,下载安装ActiveX控件,远程监控实现需要的控制。     

浅谈广电机房动力环境监控系统的建设

针对目前机房管理的现状,对现有骨干机房实现网络化管理,通过局域网实现机房的远程监控,突破传统的机房运维模式,增强机房运行安全性,提高机房运维故障的处理效率。