基于PSO算法的运动目标跟踪研究

提出一种基于PSO的运动目标跟踪方法,并在TMS320DM642上实现.该方法首先针对采集到图像的Y分量通过帧间差分和背景差分相结合的方法建立背景模型,然后检测出前景运动目标,接着通过前景运动目标初始化目标模板,再对目标模板和待跟踪视频图像分别进行两次金字塔降采样,降低目标模板和待跟踪视频图像的分辨率.在顶层金子塔上采用粒子群优化算法对跟踪目标进行粗定位,在中间层和底层金字塔上采用钻石搜索方法对跟踪目标进行精确定位.在目标跟踪的过程中,目标模板随运动目标的变化而不断更新,实现对目标的实时连续性跟踪.该方法可以有效降低计算复杂度,提高搜索效率.     

关于中国特色水利现代化道路的思考

2011年中央1号文件提出“要努力走出一条中国特色水利现代化道路”,为新时期水利改革和发展指明了方向。根据对现代化内涵的理解,分析水利现代化的内涵和特征,并结合我国的国情和水情,提出推进我国水利现代化进程的对策和建议。     

科学认识河湖水系连通问题

近年,河湖水系连通问题受到了极大关注,各级水行政主管部门对河湖水系连通的理论问题提出了迫切需求。结合国内外河湖水系连通的实例以及不同专家的意见和建议,对河湖水系连通的相关问题进行了初步梳理和总结,提出了当前推进河湖水系连通工作应注意的几个问题。     

ERP软件管理技术在我国的应用分析

随着科技的高速发展,现代化的建设中不可缺少的运用多种管理软件,ERP作为一种新型的企业管理模式系统,是信息时代的高级管理方式,在企业的各项管理运作中优化组合,提高了管理能力.本文就EKP软件在我国的应用进行了简单的分析.     

基于优化网格的最小生成树聚类算法

提出一种基于优化网格的最小生成树聚类算法OGMST(MST Clustering Algorithm Based on Optimized Grid),一方面利用最小生成树的方法进行聚类,另一方面利用了参数自动化的网格划分技术和密度阈值处理技术,解决了最小生成树聚类算法不适用于多密度数据集的局限性,提高了现有的多密度聚类算法的效率和精度.算法还对边界点进行了有效的处理.实验表明算法具有较好的可扩展性,是一种高效、快速的聚类算法.     

Dynamic Routing with Security Considerations

Security has become one of the major issues for data communication over wired and wireless networks. Different from the past work on the designs of cryptography algorithms and system infrastructures, we aim at the proposing of a dynamic routing algorithm that could randomize delivery paths for data transmission. The algorithm is easy to implement and compatible with popular routing protocols, such as Routing Information Protocol in wired networks and Destination-Sequenced Distance Vector protocol in wireless networks, without introducing extra control messages. An analytic study on the proposed algorithm is presented, and a series of simulation experiments are conducted to verify the analytic results and to show the capability of the proposed algorithm.     

Experimental dynamic characterizations and modelling of disk vibrations for HDDs

Currently, the rotational speed of spindle motors in HDDs (Hard-Disk Drives) are increasing to improve high data throughput and decrease rotational latency for ultra-high data transfer rates. However, the disk platters are excited to vibrate at their natural frequencies due to higher air-flow excitation as well as eccentricities and imbalances in the disk-spindle assembly. These factors contribute directly to TMR (Track Mis-Registration) which limits achievable high recording density essential for future mobile HDDs. In this paper, the natural mode shapes of an annular disk mounted on a spindle motor used in current HDDs are characterized using FEM (Finite Element Methods) analysis and verified with SLDV (Scanning Laser Doppler Vibrometer) measurements. The identified vibration frequencies and amplitudes of the disk ODS (Operating Deflection Shapes) at corresponding disk mode shapes are modelled as repeatable disturbance components for servo compensation in HDDs. Our experimental results show that the SLDV measurements are accurate in capturing static disk mode shapes without the need for intricate air-flow aero-elastic models, and the proposed disk ODS vibration model correlates well with experimental measurements from a LDV.     

公信力，媒体只有这一条命

这是一个被人誉为资讯爆炸的时代,这是一个他信力接近冰点的时代……生活在信息时代的人们,每天都接收到众多资讯,这些资讯涵盖大众生活的各个方面,商业、政治、体育、生活等。而大大小小的媒体每天将最新的新闻与资讯传达给大众时,也夹杂着它们对于新闻事件的观点和态度。     

Room-temperature tests of an optical transducer for resonant gravitational wave detectors

A two-oscillator transducer incorporating a laser-illuminated Fabry-Perot cavity with a finesse of 77,500 and a power dissipation of 1.2 μW was tested at room temperature. The energy of the last resonator with a mass of 1.25 g was measured to be k(B)T within 8%, and no back action from the sensor could be detected. The lowest value of the noise measured away from resonance was 1.0 × 10(-15)m/√Hz, and the electronic noise was 3.2 × 10(-17) m/√Hz. That transducer is designed for a 2400-kg gravitational wave antenna operating at cryogenic temperatures. At 4.2 K and for mechanical quality factors of 3 × 10(6), the measured thermal and electronic noise levels would translate into a sensitivity in h equal to 7.0 × 10 (-19) and 1.5 × 10(-19), respectively.