雷达智能抗干扰体系研究

干扰场景与反干扰手段的多样性,造成了雷达反干扰策略的千变万化,客观上要求雷达反干扰实现智能化。文中提出雷达智能化反干扰系统体系,归纳了构成该系统的要素:基于宽带与窄带干扰侦察相结合的干扰认知技术、基于博弈论的反干扰策略调度技术、系统级的干扰对抗技术。文章所提的认知型智能雷达反干扰体系可以解决雷达向认知方向发展的需求。     

Hybrid scheme for three-cell multi-user MIMO cellular networks

Orthogonal schemes are usually adopted for cell-edge users in a cellular network, where the spectrum is poorly utilized. A new interference alignment （IA） based space-division hybrid （IA-SDH） scheme is proposed by joint design transmit precoding matrices and beamforming matrices for a three-cell constant cellular network, where users at cell-center work with a conventional scheme while users at cell-edge utilize an IA scheme. Therefore, the cell-edge users suffer no interference and cell-center users are only affected by negligible inter-cell interference. Analysis simulation shows that more users can be served simultaneously than that of a conventional scheme in certain user distributions.     

基于VR技术的智能变电站混合巡检培训系统设计

为提升变电站混合巡检培训系统对学员的培训效率、增加学员的体验感和学习兴趣,设计了一种基于VR技术的智能变电站混合巡检培训系统,通过SolidWorks和3D Max结合设备电气特点、动作特点以及物理特点共同构建变电站设备场景,采用3D Max软件创建三维虚拟变电站场景,便于学员在三维场景中漫游巡检.在实验中,通过变压器...     

DNA-纳米颗粒共聚体在最大匹配问题中的应用

该文提出一种DNA计算模型,利用DNA-纳米金颗粒共聚体的自组装来解决图论中的一个NP完全问题——最大匹配问题。根据模型该文设计了能够基于一个具体的图进行自组装的特殊的DNA-纳米金颗粒共聚体,然后利用一系列的实验方法来获得最终的解。这种生物化学算法可以极大地降低求解最大匹配问题的复杂度,这将为DNA自组装计算模型提供一种切实可行的方法。     

Re-Printable Chiral Photonic Paper with Invisible Patterns and Tunable Wettability

The construction of invisible patterns via high-resolution printing and the independent encoding/decoding of complex information can lead to promising applications in steganography and watermarking for optical encryption. Herein, a rewritable chiral photonic paper formed by cholesteric cellulose nanocrystals and polycation is reported. The chemically crosslinked polycation network interpenetrates in the cholesteric structure while retaining the optical properties of the photonic crystals. The film exhibits controllable wettability via anion exchange, leading to extremely low contrast in the dry state but high contrast by a rapid wetting response. Triple invisible information is independently encoded on the films, including invisible patterns caused by reversible counterion-controlled wettability, permanent fluorescent labels based on fluorescent counterions, and polarization-dependent structural colors based on cholesteric structures. Full color patterns can be reversibly constructed via inkjet printing, with a high resolution of 100 µm. In addition, the circular polarization characteristics of the cellulose nanocrystals, liquid crystals, endow the system with complex and independent responses, realizing a wetting/polarization double-key decryption. This work provides a simple and effective optical technique for coding complex information on a single material platform and expands the techniques available to achieve invisible patterns for sensing and anti-counterfeiting.     

硫化铅红外探测器光电性能自动测试系统设计

简要介绍了硫化铅红外探测器光电性能自动测试系统的构造及设计思路。与传统的测试设备相比,自动测试系统具有测试快速准确、操作简单、可靠性高等显著特点。     

OBEX在蓝牙开发中的应用

OBEX作为一种基础协议,以对象模型封装信息数据,以会话协议规范传输应用,在以信息传输为底层实现的各项应用中得到了广泛的应用。在蓝牙技术的开发应用中,OBEX是很多应用剖面的底层协议,在其基础上封装实现了不同蓝牙剖面应用,大大拓展了蓝牙技术的应用领域,所以有必要深入研究并剖析OBEX协议。文中从对象模型和会话协议两个方面详细介绍了OBEX协议,并解析了其在蓝牙OPP、PBAP上的绑定实现。     

一个分布式系统下的多级授权管理模型

针对目前有关授权中存在的一些问题,如:一次授权,终身有效;授权控制深度不够等特点.文中给出了一种分布式系统下的多级授权管理模型.该模型采用基于信任度的方式进行授权并且定期对各个实体的可信性进行验证,对不符合条件的实体可以及时处理,并且对各个实体的授权均要与授权源及一些相关实体通信,加强了授权的控制.     

基于无线传感技术的楼宇环境监测系统设计

首先介绍楼宇能源管理系统,分析了环境监测对楼宇节能的重要性,然后提出了楼宇环境无线传感监测方案,设计并实现了基于无线传感网络的环境监测系统,最后总结了工程应用中如何选择监测点位置。     

一种强声警告与驱离设备的设计与实现

介绍一种基于D类功放设计并实现强声警告与驱离设备的方法.该设计应用在水域及港口防护中,配合主动型小目标探测声呐,能有效地提升对水下入侵目标的防御和处置能力.