统计MIMO雷达的多目标定位和速度估计方法

在多目标情况下,统计多输入多输出(MIMO)雷达需要对不同观测通道中估计出的目标参数进行配对,才能完成多个目标定位及其速度估计。针对这一问题,对统计MIMO雷达提出了一种映射搜索配对法来实现在不同观测通道中的目标距离延时和多普勒频率估计值的配对,从而获得目标位置及其速度估计值。仿真结果表明,该方法在目标雷达散射截面(RCS)闪烁情况下能对多个目标进行有效定位和速度估计。     

Path planning using a mobile anchor node based on trilateration in wireless sensor networks

In wireless sensor networks (WSNs), many applications require sensor nodes to obtain their locations. Now, the main idea in most existing localization algorithms has been that a mobile anchor node (e.g., global positioning system‐equipped nodes) broadcasts its coordinates to help other unknown nodes to localize themselves while moving according to a specified trajectory. This method not only reduces the cost of WSNs but also gets high localization accuracy. In this case, a basic problem is that the path planning of the mobile anchor node should move along the trajectory to minimize the localization error and to localize the unknown nodes. In this paper, we propose a Localization algorithm with a Mobile Anchor node based on Trilateration (LMAT) in WSNs. LMAT algorithm uses a mobile anchor node to move according to trilateration trajectory in deployment area and broadcasts its current position periodically. Simulation results show that the performance of our LMAT algorithm is better than that of other similar algorithms. Copyright © 2011 John Wiley & Sons, Ltd.     

基于时间序列匹配的过山车定位法

针对过山车难以精准定位的问题,本文提出了一种基于时间序列匹配的过山车定位方法。该方法首先使用动态时间规整(DTW)对惯性测量单元(IMU)的实测与仿真数据进行序列匹配,得到位置估计结果。之后将估计结果作为观测量,在误差状态卡尔曼滤波器(ESKF)中修正IMU预测结果,得到精准的定位结果。为了提高估计结果的准确度,本文提出了分段重组动态时间规整(SRDTW)算法,解决了DTW的匹配失真问题。使用本文方法对过山车进行了定位实验,结果表明,使用Z向加速度和俯仰角进行序列匹配可得到较为准确的估计结果;ESKF滤波后的平均定位误差可达0.24 m,较估计结果的定位误差减小45.6%。     

WSNs中一种新颖的模糊识别定位技术研究

 针对WSNs中定位技术存在的不足,提出了一种新颖的基于模糊识别的定位模型.在该模型中,定位空间被一些样本点划分为若干个相同的小区域,每一个样本点唯一地对应一个信号向量,通过计算未知点对应的信号向量与各个样本点对应向量的贴近度可以最终地确定未知点的坐标.该定位模型采用射频信号进行定位,不但避免了现有模型的误差叠加,提高了定位精度,而且避免了高计算复杂度与多参考点需求.基于NS-2的仿真结果表明该定位模型在具有较高的性能与较强的实用性.     

多元文化下餐饮类建筑空间审美维度变革

对室内设计、审美维度的多元化、审美标准的变革等作了论述,在明确地域性和文化概念的基础上,阐述了影响新技术背景下地域性室内设计的几方面,概括了新技术背景下中式餐饮空间室内设计的原则与方法,以适应社会发展需求。     

基于CT扫描的混凝土三维细观数值模拟

利用CT对混凝土试件进行扫描,借助MIMICS软件对扫描图像进行三维重构,得到了混凝土三维几何模型;对不同配合比的混凝土与水泥砂浆试件进行了力学试验,得到了数值模型的力学参数;基于所得混凝土三维数值试件参数,在ABAQUS软件中利用塑性损伤模型模拟了混凝土三维数值试件的单轴拉、压加载过程,并将数值模拟结果与试验结果进行了比较。结果表明:该三维数值模型具有合理性。     

阿特金斯在中国发展的现状研究

上世纪80年代以来,中国一直处于快速城市化过程中,许多境外设计公司纷纷来华发展。阿特金斯公司自1994年入驻中国。本文梳理了阿特金斯在华的发展历程,分析了其面临的困难和挑战,总结了其在中国的发展策略。     

Simulations and experiments for optimal deployment of an RFID‐based location‐aware system

The proliferation of communication and mobile computing devices and local‐area wireless networks has cultivated a growing interest in location‐aware systems and services. An essential problem in location‐aware computing is the determination of physical locations. RFID technologies are gaining much attention, as they are attractive solutions to indoor localization in many healthcare applications. In this paper, we propose a new indoor localization methodology that aims to deploying RFID technologies in achieving accurate location‐aware undertakings with real‐time computation. The proposed algorithm introduces means to improve the accuracy of the received RF signals. Optimal settings for the parameters in terms of reader and reference tag properties were investigated through simulations and experiments. The experimental results indicate that our indoor localization methodology is promising in applications that require fast installation, low cost and high accuracy. Copyright © 2009 John Wiley & Sons, Ltd.     

An Experimental Workflow for Studying Barrier Integrity,Permeability, and Tight Junction Composition and Localization in a Single Endothelial Cell Monolayer: Proof of Concept

Endothelial and epithelial barrier function is crucial for the maintenance of physiological processes. The barrier paracellular permeability depends on the composition and spatial distribution of the cell-to-cell tight junctions (TJ). Here, we provide an experimental workflow that yields several layers of physiological data in the setting of a single endothelial cell monolayer. Human umbilical vein endothelial cells were grown on Transwell filters. Transendothelial electrical resistance (TER) and 10 kDa FITC dextran flux were measured using Alanyl-Glutamine (AlaGln) as a paracellular barrier modulator. Single monolayers were immunolabelled for Zonula Occludens-1 (ZO-1) and Claudin-5 (CLDN5) and used for automated immunofluorescence imaging. Finally, the same monolayers were used for single molecule localization microscopy (SMLM) of ZO-1 and CLDN5 at the nanoscale for spatial clustering analysis. The TER increased and the paracellular dextran flux decreased after the application of AlaGln and these functional changes of the monolayer were mediated by an increase in the ZO-1 and CLDN5 abundance in the cell–cell interface. At the nanoscale level, the functional and protein abundance data were accompanied by non-random increased clustering of CLDN5. Our experimental workflow provides multiple data from a single monolayer and has wide applicability in the setting of paracellular studies in endothelia and epithelia.     

TD-SCDMA无线网络分层建设方案

在对TD-SCDMA与GSM、WCDMA网络覆盖能力进行对比的基础上,提出了TD-SCDMA无线网络分层结构,分析了分层网建设的要点和各层的功能特性及定位;提出了分层组网无线资源管理算法;通过对网络架构的对比分析,说明了TD-SCDMA分层网络架构的优势