基于ARM和GPRS技术的基站监控系统研究与设计

针对移动通信基站监控系统中,监控设备干接点和光纤环组网方式无法直接将故障信息发送给基站维护人员的问题,本文提出一种基于ARM(Advanced RISC Machines)和GPRS(General Packet Radio Service)的基站监控系统。该系统以GPRS网络作为远程数据的传输平台,充分利用远程监测分站、GPRS网络和监测中心三部分的协同,有利于维护人员通过稳定可靠的GSM网络实时的获取各个通信基站的运行情况,极大的方便了通信基站的维护。通过实时获取所有通信基站的运行情况,可以在通信基站发生故障之前排除故障,提高通信基站的稳定性。     

无线通信中使用随机天线阵列的物理层传输探讨

为了可以保证无线通信系统能够高效地进行信息通讯工作,通常我们会采用RAA法也就是随机天线阵列的物理层传输法,这种方法既可以充分保证信息的通信安全也可以保证通信质量。它通过采用在基站架设天线阵列的同时在移动端采用单天线使基站可以根据从移动端接收到的同步训练符号计算出信道范围,基站从天线阵列中随机选取一部分天线对信号作加权发射处理。移动接收点可以将从各天线传来的信号进行同相叠加并作最大似然解调。由于发射符号时基站所使用的天线都是随机变换的,如果有人对发射信号进行窃听,其设备信道也必须进行随机的调整变换,导致其盲均衡算法失效,使得通信安全得到有效地保证。不同于传统的随机加权系数法,随机天线阵列的物理层传输法功耗利用率更高。我们通过一些模拟仿真实验证实,在给定的功率下,随机天线阵列的物理层传输法相比起已有方法能够在期望用户处等到更低的误码率,从而大大提高通信安全与通信质量。     

计算机视觉技术在通信基站天线检测中的应用研究

随着通信基站的天线数量越来越多，部署天线的效率问题致使自动检测抱杆上的天线数量、判定天线、抱杆的从属关系成为热点研究课题。而基站天线的位姿受所处环境的影响，随时可能出现变化，进而导致电磁信号的强度和覆盖范围改变。计算机视觉可以应用于通信基站中天线和抱杆的目标识别，可以实现对板状天线位姿的自动化检测，还能够用于判定天线和抱杆的从属关系。     

基于GPRS的通信基站监控系统设计

设计一种基于GPRS的通信基站远程监控系统,实现监控中心对基站动力与环境设备的远程自动监视与控制。基于基站远程监控系统组网结构,设计基于ARM7微处理器为核心的基站监控系统硬件系统,完成包括MC35i模块的接口电路设计与系统软件设计。监控系统的实际应用验证设计的有效性。     

基于Zigbee技术无线投票表决器基站设计和实现

设计了一款以ARM7芯片AT91 SAM7X256为核心心,μC/OS-Ⅱ为操作系统的基于Zigbee技术无线投票基站.该基站用于连接Zigbee网络和以太网.实现了无线投票表决器远程监控和多会议室同时投票功能.主要分析了该基站的软件设计,介绍了基站如何建立无线投票表决器网络,收集表决器的投票情况,接受远程监控访问的过...     

基于AISG2.0协议的电调天线远程控制单元的设计实现

电调天线远程控制单元(RCU)是进行天线下倾角调节和天线状态远程实时监控的核心部件。本文从实际应用出发,阐述了RCU的硬件设计和相关软件模块的实现,并对RCU与基站对接过程中容易被忽视的问题进行了简要概述。     

基于PSTN的蓄电池远程监控管理系统的设计与实现

针对蓄电池基站相对分散,距离较远,数量多,布线困难的特点,介绍了一种用多Modem通讯组建远程监控系统的方案,设计并实现了一个基于公用电话网的蓄电池远程监控管理系统。该系统能实现对蓄电池基站各节电池的状态监控。     

基于TCP/IP协议的远程配置与监控系统

主要介绍了一种基于TCP／IP协议的远程配置与监控系统，包括它的功能和特点以及该系统的软、硬件实现方法。该系统采用服务器／客户端模式，利用TCP／IP协议通过Internet网络实现设备工作参数的远程配置和设备运行状态的远程监视和控制，将该系统用于全IP移动通信系统基站的远程配置和监控，结果显示该系统能够很好地完成基站的远程配置和监控功能。     

一种用于环境监控的WSN基站的设计与实现

针对无线传感器网络在环境监控应用中的特点,设计并研制了一种较为通用的无线传感器网络基站.该基站基于ARM9处理器设计,集计算存储、无线收发和智能控制等功能于一体,可以通过Internet实现对监控现场的远程监控.介绍了其主要硬件和软件设计方案,并给出了测试运行结果.     

移动通信基站节能监控系统的设计

设计了一种移动通信基站节能监控系统,通过S T M 32 F407单片机将模块整合,并设计了数据采集器与监控平台.智能控制器对基站内外温湿度检测,实现了控制新风机与空调的启停,并通过监控平台来远程监测基站设备情况.测试结果表明,本系统具有良好的稳定性,节能效果显著,具有一定的实用价值.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.