一种改进的IPSec穿越NAT方案

文中简述了IPSec协议和NAT协议的基本原理及其所存在的不兼容性问题,并分析了IETF提出的基于UDP封装的IPSec-NAT穿越方案及其不足,由此提出一种UDP封装的改进方案。该方案易于实现,有较好的兼容性。     

NAT与IPSec协议兼容性问题及解决方案

概要介绍了IPSec协议和网络地址转换(NAT)协议的基本原理，着重介绍了IPSec协议与NAT协议所存在的矛盾，最后介绍了采用UDP封装方式实现IPSec报文穿越NAT的完整方案。     

IPSec穿越NAT的设计与实现

概要介绍了IPSec协议和网络地址转换（NAT）协议的基本原理，着重介绍了IPSec协议与NAT协议所存在的矛盾，并阐述了解决矛盾所采用的方法，最后介绍了采用UDP封装方式实现IPSec报文处穿越NAT的完整方案。     

IPSec穿越NAT方案研究与改进

针对IPSec协议与NAT技术的不兼容性，研究了几种现有的解决方案，论述了UDP封装IPSec应用于IKEv2的解决方案，分析了方案存在的安全隐患，提出了改进措施，并对改进后的方案在解决IPSec与NAT协同工作方面进行了分析描述。     

IPSec和NAT兼容性研究及解决方案

网络地址转换技术（NAT）与IP安全体系结构（IPSec）在因特网上都是得到广泛应用的技术,但是它们之间却是不兼容的.分别介绍了NAT和IPSec两种协议的基本原理,并对两者存在的不兼容性进行了详细的分析,介绍了RSIP和UDP封装法两种解决方案,并对两个方案进行了比较分析,提出UDP封装法是目前更为可行的方案,最后分析实现NAT透明穿透会对IPSec造成那些影响.     

校园网实现IPSec穿越NAT的解决方案

介绍了IPSec协议和NAT的工作原理。分析了IPSec和NAT不兼容的的原因。提出了一种使用UDP数据封装和IKE修改相结合的方法实现IPSec穿越NAT的设计方案,并给出了该方案的设计思想,     

基于UDP协议的Delphi编程

本文介绍了UDP协议的概念、功能、报文格式和应用特性,分析了Delphi中封装UDP协议的NMUDP组件的常用属性、方法和事件过程,并给出了一个基于UDP协议实现网络广播的应用实例.     

一种新的IPSec穿越NAT方案

网络地址转换技术(NAT)和IP安全体系结构(IPSec)在实际中都是得到广泛应用的技术．而最初设计的IPSec无法穿越NAT通信．为了解决这个问题，IETF提出了UDP封装的草案．但是这个方案在多用户接入时无法支持细粒度的安全服务．提出了一种新的IPSec穿越NAT方案．这个方案易于实现，可以支持各种粒度的安全服务，比原UDP封装方案具有更强的兼容性．     

VPN中IPSec穿越NAT的解决方案

IP安全（IPSec）体系结构与网络地址转换（NAT）都是在因特网上得到广泛应用的技术,然而它们之间的不兼容性却制约着基于IPSec技术的虚拟专用网(VPN)发展。为解决两者之间的不兼容性,IETF提出了用户数据包协议(UDP)封装草案。但该草案对于IPSec通信双方均在NAT之后的情况,则还没提出可行的解决方法。在借鉴UDP封装方案和双向穿越NAT方案的基础上,给出了一种适应不同情形的NAT穿越解决方案,并对方案的可行性进行了详尽的分析。     

IPSec与NAT兼容性研究及解决方案探讨

本文详细分析了IPSec和NAT两者不兼容的表现与原因，对目前的解决方案及可行性进行对比分析，并提出用TCP协议代替UDP对IPSec数据包进行封装的新的解决方案。     

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。     

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。     

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。     

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.     

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.     

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     

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.