指纹识别PDA的设计与实现

PDA是一种轻便、灵巧,具有很强的可移动性的设备,随着指纹技术的发展。其已经在金融保险、门禁、身份识别等领域得到了广泛的应用,详细地分析了指纹识别PDA设计的功能,并且详细地分析了指纹采集、指纹预处理、指纹特征提取、指纹识别等核心技术,设计实现了一个功能强大的指纹识别PDA。     

指纹辨证系统日渐普及——最新产品尺寸劲缩10倍

用作系统保安加强的指纹辩证系统，多年前已有产品在市场上出售，但以往一般供个人电脑使用的指纹辩证系统，由于辩证准确度不足，所以未能在市场上普及。而近年这方面的技术发展渐趋成熟。指纹辩证系统并已内置于各种新推出的电子产品。最新的指纹辩证系统，更已将产品的外形尺寸大幅缩减，而且耗电量更低，将有利于这种技术在Noteboot、PDA、手机等装备上普及。     

指纹辨证系统日渐普及最新产品尺寸劲缩10倍

用作系统保安加强的指纹辨证系统,多年前已有产品在市场上出售,但以往一般供个人电脑使用的指纹辨证系统,由于辨证准确度不足,所以未能在市场上普及。而近年这方面的技术发展渐趋成熟,指纹辨证系统并且内置于各种新推出的电子产品。最新的指纹辨证系统,更已将产品的外形尺寸大幅缩减,而且耗电量更低,将有利于这种技术在Notebook、PDA、手机等装置上普及。     

基于PDA的公共故障核查系统的设计与实现

通过分析公共故障核查系统的原有的业务流程，提出了基于PDA的公共故障核查系统的设计与实现方法,叙述了该应用系统在PDA客户端的实现过程、M／S体系结构的网络框架、软硬件配置以及系统的整体体系结构。重点介绍了本系统PDA客户端功能模块和相应的几个关键技术。     

基于FPS200的指纹采集系统与图像增强机制

介绍了基于FPS200芯片的指纹采集系统的设计方案，采用USB方式快速简便地获取指纹原始图像，并能够根据不同采集环境调整芯片参数获得图像最佳清晰度。根据该采集系统输出图像的质量，提出了一套增强算法，通过滤波实现指纹图像的平滑与锐化，计算指纹方向流图并进行背景分割，最后进行二值化处理。算法能够有效减少指纹图像处理的时间消耗，较好地保留了指纹纹线的边缘细节，提高了图像对比度。实验表明，该指纹采集系统与图像增强算法能够获得清晰的指纹细化图，适用于AFIS各种后端处理。     

PDA电子邮件系统中的邮件识别与封装模块

介绍了PDA电子邮件收发系统，描述了如何在资源有限的PDA设备上设计与实现遵守RFC协议的电子邮件识别与封装模块，从而满足PDA设备的特定要求，最后对系统的未来发展进行了展望。     

PDA上实现遥控器的集成

在PDA上通过二次开发，利用PDA的红外线端口，接收和发射遥控器产生的红外线，使PDA可替代遥控器。文章介绍了该系统的开发和应用环境以及系统实现的原理。     

基于μC/OS-II的高性价比PDA的设计与实现

给出了一个新的PDA设计方案，利用有限的硬件资源在缺少MMU的低端CPU上设计并开发出性能接近高端的PDA系统。充分利用了嵌入式操作系统μC/OS-II的多任务和保护机制，合理地协调了硬件资源和软件系统之间的一些矛盾。实验结果证明该方案与原有PDA系统相比具有成本低、可靠性好、功能多和用户界面友好等特点。     

基于变换域数字指纹/水印的叛逆者追踪

本文介绍了基于数字指纹技术的叛逆者追踪系统的体系结构及设计原则，给出了非公开密钥、盲检测、变换域、不可见指纹（水印）原则下一种叛逆者追踪系统的工程实现。选择每个DCT块的4个低频系数进行指纹嵌入，保证了指纹的透明性和鲁棒性。实验结果表明，提出的嵌入与提取方案具有较好的隐蔽性，以及较大的信息容量，嵌入指纹后的图像与原始图像的相似度大于0．99。     

用指纹打电话——指纹手机定未来

指纹手机无非就是在手机中安装了一套指纹加密系统，和其他的指纹识别系统一样，比如大家常见的指纹考勤识别系统。手机指纹加密系统的主要原理是首先通过手机的指纹扫描系统获取用户的指纹，然后通过指纹识别软件，从截取到的图像中提取指纹，并经系统处理生成特征码，存储在手机内部数据库中，作为今后用户的验证凭证。用户在使用手机时输入自己的指纹，由识别软件将它与预留的指纹特征码进行比较，一旦相同，手机就可以解锁(流程如图1），这样一来，采用指纹加密技术的手机即使丢失，其他人也无法使用。此外，这种手机还可以凭指纹认证，上多进行电子商务活动和收发电子邮件等，以防止黑客的破坏。     

Assessing Ideational and Evaluative Skills and Creative Styles and Attitudes

This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style.     

Semantics and verification of monitors and systems of monitors and processes

In this paper we present a sound and complete semantics for the monitor concept of C.A.R. Hoare. First a method for specification of monitors, introduced by O.-J. Dahl, is reviewed. This method is based on the relation between the historic sequence of monitor procedure calls and the historic sequence of monitor procedure exits. Based on such specifications and our new monitor semantics we present a method by which it is possible to prove that a concrete monitor is an implementation of an abstract one. In the last part of the paper an axiomatic semantics for systems of concurrent processes and monitors is introduced. The method supports verification by separation of concerns: Properties of the communication to and from each process are proven in isolation by a usual Hoare style axiomatic semantics, while abstract monitors are also specified in isolation by the method reviewed in the first part of the paper. These properties of the components of the system are then used in a new proof rule to conclude properties of the complete system. Stein Gjessing received a Ph.D. (actually a Dr. philos.) from the University of Oslo (Norway) in 1985. Presently he is an Associate Professor at the Institute of informatics, University of Oslo, Norway. Dr. Gjessings research interests are in the area of concurrent and distributed programming, operating systems, formal specification and verification and programming languages.     

Rank and select revisited and extended

The deep connection between the Burrows–Wheeler transform (BWT) and the so-called rank and select data structures for symbol sequences is the basis of most successful approaches to compressed text indexing. Rank of a symbol at a given position equals the number of times the symbol appears in the corresponding prefix of the sequence. Select is the inverse, retrieving the positions of the symbol occurrences. It has been shown that improvements to rank/select algorithms, in combination with the BWT, turn into improved compressed text indexes.     

Integrating and automating analysis and optimization

The development of an interface coupling program on personal computers for an analysis software system such as ANSYS, SAP, etc. and an optimization software system, MOST, is presented. By controlling and directing the communications the interface coupler integrates the two programs while retaining their versatility and interactive features. The integrated system is used to solve a numerical example of active noise control for a three-dimensional enclosure, in which an energy density level of control points is minimized by adding the sound source to cancel the unwanted noise. The interface coupling program automates with relatively low cost the iterative process for designing an engineering system, remaining flexible in acoustical modelling and efficient in equation solving. Also, the coupling interface is developed in a general-purpose way so that it can be expanded easily to integrate more analysis software packages of different kinds.