基于MIB定义的SNMP分析系统及实现

普通SNMP分析工具无法翻译变量绑定的内容。MIB-based SNMP分析系统采用了结合MIB定义的SNMP协议分析方法,动态调入MIB文件编译得到相应MIB对象集,在SNMP解码分析时根据OID查找对应MIB对象,从而获得相关信息以完成详细的变量绑定翻译。实验证明,该系统可以大大提高SNMP协议分析的效率和对SNMP网管行为的深刻理解。     

SNMP协议动态MIB结构与高效查找算法

SNMP是一种简单网络管理协议,作为HFC网络管理的重要组成部分,其资源利用率和执行效率的高低对被管系统的整体性能有重要影响。而SNMP软件的主要性能瓶颈在于保存和查找MIB对象的效率。该文通过分析MIB的结构特点,对比目前普遍使用的Hash表法,提出了使用多路径树来保存完整MIB结构的方法,消除公共ID的重复存储,提高资源利用率。在此基础上,给出一种综合使用多路径树和AVL树的高效查找算法,它能够有效地提高MIB对象的查找效率。该方法已经成功地应用于自主开发的“双向有线HDTV信道传输系统”中,实际网络验证表明,该方法具有较高的查找性能和可靠性。     

Windows平台上访问SNMP变量的方法

SNMP变量是被管理设备运行期间SNMP代理维护、管理的被管理对象的实例,所有的SNMP变量的集合便组成了管理信息库(MIB),网络管理站通过对MIB库的读写操作完成对被管设备的管理.阐述在Windows平台下访问这些SNMP变量方法和实现步骤.     

基于SNMP协议的网络性能管理系统研究与设计

随着网络的发展,对网络进行监控和维护等管理操作变得更加困难。简单网络管理协议（SNMP）是能够满足网络管理需要的协议也是目前最为流行的网络管理解决方案。本文首先介绍了SNMP的概念、框架结构和管理信息库（MIB）、消息传输机制,然后详细介绍了基于SNMP的网络性能管理系统的设计思想与实现方法。     

基于SNMP的MIB库访问

MIB库的访问是实现网络管理的关键.本文简要概述了SNMP协议及网络管理信息库,利用WinSNMP API实现了基于SNMP的MIB库的访问,从而进一步实施网络管理的各项功能.     

基于NETCONF的SNMP MIB数据转换

针对SNMP网络管理技术难以满足网络配置管理需求的现状,利用XML在网络管理中的应用优势,提出一种SNMP管理信息库(MIB)到XML格式的数据转换模式。该模式对SNMP MIB数据进行合理的压缩和分类,分析MIB描述规范SMI和XML的语法特征并进行相应转换。该数据转换模式解决了NETCONF目前在数据建模方面的不足,使该协议实现具有更好的通用性和可扩展性。     

基于协议分析的SNMP管理信息库可视化

从协议分析角度对SNMP报文进行解析，并采用Java语言开发了SNMP协议分析工具，采集了网络设备的MIB数据，对MIB的参数、拓扑结构可视化进行了研究。     

基于SNMP++的MIB浏览器研究

MIB是一个保存网络管理信息的虚拟数据存储空间,由多组被管理对象组成;MIB浏览器是对被管理设备中SNMP变量进行管理的图形化网络管理工具。分析了开发MIB浏览器的难点,给出了实现一个基于SNMP++的MIB浏览器的关键算法。     

简单网络管理协议SNMP浅析

介绍了SNMP协议的实现原理和基本应用,以及管理信息库MIB和管理信息结构SMI等相关知识。回顾了SNMP协议不断发展与完善的历史。     

一种SNMP MIB管理器的设计与实现

MIB管理器作为SNMP网络管理系统的重要支撑工具,以平台形式提供MIB对象存取访问的信息转换与映射机制。结合SNMP MIB描述文法分析,探讨基于正则表达式模式匹配算法进行协议文本分析的MIB信息转换方法,结合C++类封装MIB API,提供MIB转换信息与SNMP协议编码数据结构的内存映射途径。为支持MIB的动态扩展,提出一种综合MIB编译与浏览功能的SNMP MIB管理器平台结构,并给出其设计与实现过程描述。     

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.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

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.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

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     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.