紧支撑双正交的多重向量值小波包

文章研究了紧支撑双正交多重向量值小波包的性质,并给出了相应的分解与重构算法。     

中等强度射电平谱类星体的光学光谱研究

采用FIRST亮类星体巡天（FBQS）的一个样本,从传统分类的射电噪类星体中分离出射电中等强度平谱类星体,对它们以及射电噪和射电宁静类星体的光学光谱进行了比较研究,发现中等强度射电平谱类星体有与射电宁静类星体相似的光学光谱．该结果进一步支持先前的研究观点,即观测到的中等强度射电平谱类星体实际上是射电宁静类星体,只是由于经过视线方向相对论性喷流的增强效应,使其在射电波段呈现为传统分类中的射电噪类星体．     

无线传感器网络通信链路评估问题

研究了现有典型的无线传感器网络链路质量评估量度,针对单次RSSI,LQI的链路评估不准确问题,提出了均值RSSI,均值LQI链路评估方法;以MicaZ为实验平台,对无线传感器网络的通信链路进行了实验研究.在对大量采样值进行统计分析的基础上,提出了一个基于高斯分布的链路评估模型,并对模型进行了验证.该建模方法具有一般性,所建立的高斯链路评估模型既可为无线传感器网络的实际应用提供依据,又可为上层协议的仿真研究提供有价值的参考.     

广播气象节目制作的初步探讨

分析了电台气象节目编辑的重要性,介绍了电台气象节目的编辑原则,指出了气象节目制作中的几个注意事项。     

Integration of Radio-Frequency Identification and 4D CAD in Construction Management

In order to increase the productivity of construction industry, emerging technologies have been constantly introduced and applied in this traditional industry by pilot researchers. This paper provides an integrated model of radio-frequency identification (RFID) and four-dimensional Computer-Aided Design (4D CAD) in construction management. RFID involves the use of tags that collect data and transmit data. RFID can collect data by radio waves instead of light waves. RFID technology is surpassing barcode technology where light waves are easily blocked and barcode labels are easy to fall off or become unreadable due to dust, dirt, or other contaminants. 4D CAD which involves 3D construction models and construction schedules presents visualized construction process. Integration of RFID and 4D CAD in this paper built a dynamic construction management and control system which would reduce the time of capturing data on site and control quality of construction materials efficiently. Pilot test result shows that a construction manager can easily understand how and what a complicated construction project will be accomplished. Although further analysis is necessary, RFID and 4D CAD show promises of being a beneficial technology in construction management.     

射频识别系统安全性设计

射频识别系统的安全性因其广泛的、安全的、敏感的应用而变得重要。基于射频识别系统的特点和信息安全需求,分析并设计了射频识别系统基于共享密钥的身份鉴别和基于流密码的数据加密传输两阶段的安全方案,有助于推动正在兴起的射频识别系统的应用。     

Optimized Parallel Cooperative Spectrum Sensing Strategy Based on Iterative Kuhn-Munkres Algorithm

Spectrum sensing is the key and premise of cognitive radio （ CR）. Current parallel cooperative spectrum sensing strategies have some problems, such as large number of cooperative secondary users and lack of consideration for the sensing overhead and the transmission gain. To solve those problems, an optimized parallel cooperative spectrum sensing strategy based on iterative Kuhn- Munkres （KM） algorithm was proposed. To maximize the total system profit, it considers the tradeoff between the sensing overhead and the transmission gain. Iterative KM algorithm was applied to obtaining the optimal assignment, which indicated when and which channels secondary users should sense. Furthermore, the required detection-probability was introduced to avoid unnecessary waste when the accuracy met the system requirement. Monte Carlo simulations show that the proposed strategy can obtain higher total system profit with fewer cooperative secondary users.     

教学实验数据处理中的平均分组法和最小二乘法

实验数据处理是教学实验中的一个重要环节,学生常因不能准确理解相关概念和分析方法,而采用了错误的实验数据处理方法。针对该问题,文中通过介绍实验数据处理中的平均分组法和最小二乘法,结合误差理论进行针对性分析,给出平均分组法计算量小但误差较大,最小二乘法所得结果精确度高但计算过程烦琐的结论。在教学实验数据处理环节,建议依靠计算机软件,使用最小二乘法来处理实验数据。     

FAST的进展——科学、技术与设备

随着射电天文学的发展,高灵敏度的大口径射电望远镜成为射电观测的重要设备.我国正在建设中的500 m口径球面射电望远镜(FAST)将成为世界上最大、最灵敏的单口径射电望远镜,它有望在中性氢巡视、脉冲星搜索、国际VLBI网联测及地外生命搜寻等重要前沿领域取得突破.本文介绍了FAST工程概念的提出及望远镜概况,列出了FAST的主要科学目标及早期科学准备,重点叙述了FAST工程在科学、技术与设备方面的最新进展,并对FAST工程的发展做出了展望.     

基于PIC16F877A控制器的RKE系统的设计

研究了一类基于PIC16F877A单片机控制器RKE控制系统问题,提出了系统的软硬件设计方法.采用了PIC16F877A、MAX1479/1471为核心器件,搭配相应的外围电路,设计一款基于ASK/OOK超外差射频的RKE控制系统.该系统具有外围电路简单、可靠性好、成本低等优点,因此它具有很好的市场推行价值.