基于PhotoModeler Scanner的普通数码相机快速检校研究

随着分辨率的不断提高与价格的日益降低,数码相机已成为近景摄影测量的基本设备,而相机的准确检校是保证量测精度的关键因素.借助于PhotoModeler Scanner软件,本文实现了相机的快速准确检校,并对野外检校的稳定性和质量进行了分析,说明该检校方法简便可靠.     

一种改进的的网络安全扫描工具

介绍网络安全扫描工具的发展及CVE标准,在仔细分析当前先进的网络安全扫描工具NESSUS的基础上,提出一种新型的更适合安全管理员使用的扫描工具。     

基于CVE的安全脆弱性数据库系统的扩展设计

针对现有脆弱性数据库存在的不足．文章通过引入CVE的数据兼容机制．按照管理脆弱性数据和服务安全工具并重的原则，提出并扩展设计了一类通用性更好的安全脆弱性数据库系统．可以支持集脆弱性探测、漏洞存储、安全评估于一体的多项应用。此外．对其管理维护和应用访问接口进行了讨论．最后给出了该库在已实现的分布式脆弱性扫描系统和安全评估系统中的具体应用．     

Coherent microscopy by laser optical feedback imaging (LOFI) technique

The application of the non-conventional imaging technique LOFI (laser optical feedback imaging) to coherent microscopy is presented. This simple and efficient technique using frequency-shifted optical feedback needs the sample to be scanned in order to obtain an image. The effects on magnitude and phase signals such as vignetting and field curvature occasioned by the scanning with galvanometric mirrors are discussed. A simple monitoring method based on phase images is proposed to find the optimal position of the scanner. Finally, some experimental results illustrating this technique are presented.     

活套扫描器在轧线中的应用及常见故障分析

本文介绍活套扫描器在轧机控制系统中的应用及常见故障分析,并且通过实际操作总结出一些工程应用中的维护经验,适应于实际工程。     

入侵检测系统

入侵检测系统（IDS）是一种基于主动策略的网络安全系统,是对常用的被动策略的逻辑补偿,是网络安全系统中的重要组成部分。首先对IDS技术进行了分析,说明了入侵检测的技术原理,并从两个角度对IDS进行分类;接着讨论了系统的实现方法和现有的IDS系统;最后总结了这项技术,展望了未来工作。     

业务逻辑编译器的设计与实现

本文介绍了一种应用程序中业务逻辑的实现方案。该方案使用脚本语言来定义业务逻辑,由业务逻辑编译器来生成代码,从而提高业务开发的效率和扩展性。业务逻辑编译器由业务解释模块和业务执行模块组成。该方案已在电信领域投入使用,取得了预期的效果。     

网络扫描技术实现及其在网络安全中的应用

在介绍了网络扫描器和其基本工作原理后,归纳并且详细分析了网络安全扫描软件所涉及到的几种关键技术,其中包括：全TCP连接扫描、TCP SYN扫描、ICMP扫描、TCP FIN扫描等。然后介绍了几种常见的端口扫描工具以及网络安全扫描软件：Safety。最后给出了解决端口扫描问题的建议和对策。     

LexAGen: An interactive incremental scanner generator

This paper describes LexAGen, an interactive scanner generator which is the first component of an interactive compiler generation environment. LexAGen can generate fast scanners for languages whose tokens can be specified by regular grammars. However, LexAGen also supports several context-sensitive programming language constructs such as nested comments and the interaction between floating-point numbers and the range operator in Modula-2. In addition, LexAGen includes a fast new algorithm for keyword identification. However, the most important and novel aspects of LexAGen are that it constructs scanners incrementally and that specifications can be executed anytime for validation testing. LexAGen specifications are expressed and entered interactively in a restricted BNF format (no left recursion). All syntactic errors and token conflicts are detected and reported immediately as LexAGen incrementally constructs a deterministic finite automaton to represent the scanner. At any time, the user can test the scanner fragment which has been entered by supplying text to be scanned. Alternatively, the user can generate a C-code scanner from the automaton. The generated automaton uses a direct execution approach and is quite fast. LexAGen is implemented in Smalltalk-80. Its extensive use of interactive graphics makes it very easy to use. In addition, the object-oriented paradigm of Smalltalk-80 is the basis for the incremental analysis, the error detection scheme and an intermediate representation which can be easily modified to generate scanners in other target languages such as Pascal, Modula-2 and Ada.     

扫描仪理想的光谱响应特性研究

提出了扫描仪应该是一个颜色反应器的观点 ,并通过颜色反应器理论探讨了扫描仪理想的光谱响应条件 ,为扫描仪中照明光源的理想光谱分布 ;滤色片以及光电倍增管的最佳光谱响应提出了理论依据。