基于Java与Flex的科技计划项目管理系统实现

主要介绍了利用Flex与Java的集成构建,实现科技计划项目管理系统的方法,包括业务层的实现,表示层中模型的实现、控制器的实现、视图的实现,数据持久层的实现以及LCDS的实现方法.     

基于FPGA的数字钟系统的设计与实现

与机械钟相比,数字钟是一种更准确、直观的计时工具,设计方式也有多种,有软件仿真实现、单片机实现、PC机实现、专用电子钟芯片实现等多种实现方法。本文介绍了一种基于FPGA实现数字钟的硬件实现方法,能较大降低硬件实现的复杂度。     

高级加密标准S盒的ASIC实现

S盒在AES中占有至关重要的地位,在AES的硬件实现过程中,S盒的实现直接决定了它的性能和实现代价.传统实现方法是利用查表的方法,这种实现方法经综合工具处理后,利用率只有25%左右,实现性能很低.给出了高级加密标准的S盒的一种硬件实现,用纯逻辑算法实现了S盒.这种实现方法与一般的查表实现方法相比较,版图时的利用率大大提高,一般用该方法可以到达70%.     

基于Annotation的Spring事务应用设计

该文简要介绍Spring的事务实现技术,讨论了Spring中的事务的两种实现方式。通过同一个案例阐述了在Spring中通过xml配置来实现事务和使用了Annotation实现事务,比较了两种实现方式的优缺点。对在Spring使用Annotation实现事务作了总结,从而体现使用Annotation实现事务简洁性和良好的扩展性。     

基于Annotation的Spring事务应用设计

讲解Spring的事务实现技术,讨论Spring中事务的两种实现方式。通过同一个案例阐述了在Spring中对XML配置来实现事务和使用了Annotation实现事务,比较了两种实现方式的优缺点。在Spring使用Annotation实现事务作出总结,从而体现使用Annotation实现事务简洁性和良好的扩展性。     

基于CUDA的高效IDEA加密算法设计与实现

为了实现一个高效的加密算法,本文充分利用图形处理器(GPU)的并行处理能力,提出基于CUDA实现IDEA加密算法的方法,对该方法的设计和实现进行详细的阐述,并通过实验与传统的基于CPU的实现方法进行性能比较,基于CUDA的IDEA实现速度上远远高于基于CPU的实现.     

基于GPU的特征点提取与匹配算法比较

判断一种算法的GPU实现是否和CPU实现一样可靠、算法的GPU实现是否能够被安全地使用,是GPU实现能否进一步推广的关键问题.文中以SIFT和KD树搜索这2个被广泛使用的算法为例,对其GPU实现和CPU实现进行了系统的实验分析和比较测试.此外,针对高分辨率图像,给出了基于GPU的SIFT算法和KD树搜索算法的设计与实现.实验结果表明,基于GPU的实现和CPU的实现能提取出95％左右的相似特征点;2种算法实现的特征点重复率和匹配率相当,但GPU实现可获得高达13X(特征提取)和43X(特征匹配)的加速比,因此基于GPU的实现在具体应用中完全可以被安全地使用.     

FCMAC网络的软硬件协同设计与实现

提出了FCMAC网络的一种基于NiosII的软硬件协同设计方法,解决了FCMAC软件实现速度慢、硬件实现耗资源的不足。通过Matlab仿真得出FCMAC网络的各参数。分析影响软件实现FCMAC速度的关键算法,对FCMAC算法进行软硬件划分。在NiosII IDE开发环境下,基于C实现软件模块,以用户自定义指令形式实现硬件模块和软硬件的衔接,即完成软硬件的协同设计。试验结果表明,FCMAC的软硬件协同实现在软件实现速度慢、硬件实现耗资源之间实现了折中,可通过不同的软硬件划分,实现速度与资源的互换。     

单片机的PWM控制技术

在单片机中实现PWM控制技术的方法及其原理,分析单片机实现PWM功能几种方法的优缺点,分别介绍用单片机的PWM模块实现PWM功能、用程序模拟实现多路PWM功能、用定时器资源实现高分辩率PWM功能和用机外硬件实现PWM功能的方法,并分析这些的方法的优缺点。     

基于TMS320VC33扩展异步串口的一种方法

介绍了TMS3 2 0VC3 3DSP实现异步串行通信接口的三种方法 :软件模拟实现、硬件实现、专用协议芯片实现。给出了具体实现的硬件接口和软件编程。在接口的第二种和第三种实现方法中 ,都使用了FPGA实现逻辑接口。     

Efficient Development of Lexical Language Resources and their Representation

Statistical approaches in speech technology, whether used for statistical language models, trees, hidden Markov models or neural networks, represent the driving forces for the creation of language resources (LR), e.g., text corpora, pronunciation and morphology lexicons, and speech databases. This paper presents a system architecture for the rapid construction of morphologic and phonetic lexicons, two of the most important written language resources for the development of ASR (automatic speech recognition) and TTS (text-to-speech) systems. The presented architecture is modular and is particularly suitable for the development of written language resources for inflectional languages. In this paper an implementation is presented for the Slovenian language. The integrated graphic user interface focuses on the morphological and phonetic aspects of language and allows experts to produce good performances during analysis. In multilingual TTS systems, many extensive external written language resources are used, especially in the text processing part. It is very important, therefore, that representation of these resources is time and space efficient. It is also very important that language resources for new languages can be easily incorporated into the system, without modifying the common algorithms developed for multiple languages. In this regard the use of large external language resources (e.g., morphology and phonetic lexicons) represent an important problem because of the required space and slow look-up time. This paper presents a method and its results for compiling large lexicons, using examples for compiling German phonetic and morphology lexicons (CISLEX), and Slovenian phonetic (SIflex) and morphology (SImlex) lexicons, into corresponding finite-state transducers (FSTs). The German lexicons consisted of about 300,000 words, SIflex consisted of about 60,000 and SImlex of about 600,000 words (where 40,000 words were used for representation using finite-state transducers). Representation of large lexicons using finite-state transducers is mainly motivated by considerations of space and time efficiency. A great reduction in size and optimal access time was achieved for all lexicons. The starting size for the German phonetic lexicon was 12.53 MB and 18.49 MB for the morphology lexicon. The starting size for the Slovenian phonetic lexicon was 1.8 MB and 1.4 MB for the morphology lexicon. The final size of the corresponding FSTs was 2.78 MB for the German phonetic lexicon, 6.33 MB for the German morphology lexicon, 253 KB for SIflex and 662 KB for the SImlex lexicon. The achieved look-up time is optimal, since it only depends on the length of the input word and not on the size of the lexicon. Integration of lexicons for new languages into the multilingual TTS system is easy when using such representations and does not require any changes in the algorithms used for such lexicons.     

非合作航天器自主相对导航研究综述

非合作航天器自主相对导航作为与非合作航天器实现空间交会对接过程中的关键技术,是在轨服务技术的重点发展方向之一,其研究具有重要的理论价值与工程意义.针对在轨服务任务对于自主相对精确导航的需求,本文对发展非合作航天器自主相对导航技术的必要性进行了阐述.首先总结了非合作航天器自主相对导航技术的内涵与研究现状;随后分析梳理了非合作航天器自主相对导航过程涉及到的光学敏感器、位姿测量、导航滤波器以及地面实验等关键技术.最后根据研究现状和关键技术的分析指出了非合作航天器自主相对导航目前存在的主要问题并给出后续发展的建议.     

Discrete estimators of characteristics for periodically correlated time series

Results of an investigation of the characteristic estimator properties for periodically correlated time series obtained on the basis of finite data length are given. The formulae for the bias and variance of the estimators for mean and covariance function Fourier coefficients are found. The conditions for the choice of sampling interval value, for which aliasing effects do not appear, are obtained. The interpolation formulae for the mean and covariance function estimates are derived. The dependencies of the statistical characteristics of the estimators on sampling interval and sample size for modulated signals are analyzed.     

Joint organisational and technical development of CIM-systems: An extension of the classic scandinavian approach

In Scandinavia theories and methods for cooperative design tools for the computer supported craftsman have been the topics for intensive research for several years. This paper widens the discussion by taking in the question of CIM and the reshaping of the division of labour, work organisation and manufacturing processes. The paper argues for an evaluation of methods and tools developed for very different aspects of integrated manufacturing.     

基于诱导向量的CC4神经网络行为研究

角分类前向神经网络CC4可以快速对文本数据进行分类处理.本文在定义二值向量的诱导向量的基础上,给出CC4神经网络隐层、输出层的权矩阵构造方法的诱导向量分析,并给出CC4神经网络隐层输出的基本原理、基于泛化距离的隐层权矩阵构造方法的几何解释,以及输出层权矩阵构造的约束条件;揭示了角分类神经网络学习、工作的基本原理.本文为基于实向量输入的快速角分类神经网络的设计提供了借鉴及必要的理论基础.     

Necessary and sufficient condition for stabilizability of discrete-time linear switched systems: A set-theory approach

In this paper, the stabilizability of discrete-time linear switched systems is considered. Several sufficient conditions for stabilizability are proposed in the literature, but no necessary and sufficient. The main contributions are the necessary and sufficient conditions for stabilizability based on the set-theory and the characterization of a universal class of Lyapunov functions. An algorithm for computing the Lyapunov functions and a procedure to design the stabilizing switching control law are provided, based on such conditions. Moreover, a sufficient condition for non-stabilizability for switched system is presented. Several academic examples are given to illustrate the efficiency of the proposed results. In particular, a Lyapunov function is obtained for a system for which the Lyapunov–Metzler condition for stabilizability does not hold.     

Meme Media for Clipping and Combining Web Resources

The publication and reuse of intellectual resources using the Web technologies provide no support for us to clip out any portion of Web pages, to combine them together for their local reuse, nor to publish the newly composed object as a new Web page for its reuse by other people. This paper shows how the meme-media architecture is applied to the Web to provide such support for us. This makes the Web work as a shared repository not only for publishing intellectual resources, but also for their collaborative reediting. We will propose a general framework for clipping arbitrary Web contents as live objects, for defining IO ports on such a clip, and for the recombination and linkage of such clips based on both the original and some user-defined relationships among them. In our previous works, we proposed two separate frameworks for these three purposes; one works for the first two, and the other for the last. Here we will propose a unified framework for these three purposes, as well as its detailed internal mechanisms. Then we show how it can be easily applied to various legacy Web applications to develop innovative services.     

User interface and interactivity display for converging PC,IPTV, and mobile device in a video sharing service

This paper proposes a user interface and interactivity adaptor for PCs, Internet protocol televisions (IPTVs), and mobile devices. The adaptor accounts for the screen limitations for display of mobile devices and the remote control limitations for the interactivity of IPTVs. A framework for convergence of these client‐side devices is also proposed as a basis for a video sharing service. In‐depth verification and evaluation demonstrate the robustness of the proposed adaptor.     

一种航天器对接姿态校正参数测量方法

利用圆环投影推导三维空间中航天器相互姿态关系的数学模型,对圆环投影的检测方法进行初步讨论,提出一种基于圆环投影检测的航天器对接校正参数测量方法。该方法能直观地获取航天器对接过程中跟踪航天器的姿态校正角度参数,且不必在目标航天器布设特征光点,为实现空间航天器准确对接提供了实用、有效的解决方案。     

基于互联网的工业过程监控系统的安全性研究

对基于互联网的工业过程监控系统可能遭受袭击的各种情况进行分析,提出了三个方面的安全措施:为防止未授权用户恶意破坏控制系统,提出了对付网络袭击者恶意操作控制系统的安全保护措施;为防止未授权用户进入、操作控制系统,提出了身份认证保护策略;为保证控制数据传输的快速性和安全性,将高级数据加密标准AES与RSA相结合,实现了适合于实时监控系统的数据加密算法,并通过测量数据加密传输的网络时延来验证该算法的有效性。