新一代网络技术—ATM

对ＡＴＭ的技术特征（信元、传输技术、交换技术）和基于ＡＴＭ的Ｂ－ＩＳＤＮ协议参考模型进行了较详细的论述；讨论了ＡＴＭ与现有网络的互连以及ＡＴＭ技术的现存问题；最后给出了几个应用实例。     

基于H.264的嵌入式Web网络视频监控系统设计

针对传统的视频压缩技术不适合在恶劣的网络环境下应用的问题,提出了一种基于H.264的远程视频监控系统的设计方案。该系统将嵌入式技术、网络技术和视频编码技术结合在一起,嵌入式系统中的摄像头采集到的视频信号经H.264标准编码压缩后,通过系统内置的Web服务器实时地传递给远程监控端,从而实现了远程监控端的浏览器与嵌入式Web服务器之间的互联通信。测试结果表明,该系统的视频压缩率高、图像清晰、实时性强。     

数字音视频取证系统中的视频压缩技术简介

介绍了在远程视频网络传输中发挥着重要作用的高性能视频压缩技术,对主流的视频压缩标准M-JPEG、MPEG4和H.264进行了讨论。基于这三种标准编码方案,将高性能的视频编码应用到了所开发的网络式数字音视频取证系统中,取得了较好的效果。     

基于小波变换的VBR分层编码算法

ＡＴＭ的提出对现有编码技术产生了重大影响,传统的编码方法已难适应ＡＴＭ技术发展要求。本文针对ＡＴＭ网络的特点,结合小波变换的优势,讨论了小波变换怎样用于分层以及怎样对分层数据进行可变比特（ＶＢＲ）编码,最后给出了实验结果。     

基于ATM实现MPLS的关键技术探讨

ＭＰＬＳ（多协议标记交换）被认为是当前各种 ＡＴＭ支持 ＩＰ技术中的最佳方案,将成为 ＡＴＭ下一步发展和演进的方向。但是 ＡＴＭ向 ＭＰＬＳ发展时具有很多不同于基于传统路由器的 ＭＰＬＳ网络的特点。该文从标记堆栈的封装、环路控制、扩展性与流合并中的信元交织、ＡＴＭ协议与ＭＰＬＳ协议的关系、Ｍ的处理和对ＩＰ Ｏ＆Ｍ的支持５个方面对基于ＡＴＭ的ＩＳＲ和基于ＡＴＭ的ＭＰＬＳ网络的实现这些最基本和最关键的问题进行了综合讨论,并比较了各种可能的方法的优缺点。     

LC8301H单路高清720P网络服务器

LC8301H单路高清720P网络视频服务器基于标准H．264视频压缩和G．711、G．722音频压缩编码．视频编码尺寸支持高清720p编码。     

基于Linux的网络视频监控系统的设计

介绍了一个基于嵌入式Linux的网络视频监控系统的设计与实现,阐述了嵌入式服务器软硬件部分的设计思路与体系架构,探讨了视频采集、视频压缩编码和网络通信模块的设计。     

基于H.265标准的高清网络摄像机设计

基于H.265视频压缩标准的500像素高清网络摄像机,具备多种视频预处理功能,有利于提高视频质量.采用H.265视频编码压缩技术,具有较高的压缩比,在较窄的网络带宽条件下,能够传输流畅的高清视频信号,降低了对网络传输带宽的要求,有利于高清视频网络监控的推广和应用.     

基于时空白适应预测的无损视频压缩

本文提出了一种时间预测和空间预测相结合的视频压缩方法，配合自适应的融合技术，然后采用基于上下文的熵编码技术，对视频序列进行无损压缩，使无损视频压缩的效果比JPEG-LS和CALIC平均优30％。     

基于时空白适应预测的无损视频压缩

本文提出了一种时间预测和空间预测相结合的视频压缩方法，配合自适应的融合技术，然后采用基于上下文的熵编码技术，对视频序列进行无损压缩，使无损视频压缩的效果比JPEG-LS和CALIC平均优30％。     

Impact of QOS requirements on video coding for ATM networks

The broadband integrated services digital networks (B-ISDN) based on asynchronous transfer mode (ATM) technology can support a wide range of applications such as voice, video, still images, and data. Compression techniques increase the effective bandwidth utilization, but the bursty and asynchronous nature of the traffic can still lead to congestion in the network, and degradation of image quality and quality of service (QOS). Some of the features to provide better coding schemes for ATM networks are layered coding, resynchronization, buffering, interleaved schemes, constrained bit rate due to buffers, encapsulation with the RTP or AAL1 for clock recovery, lapped transforms, motion compensation, and optimal bit allocation for coders based on wavelet transforms. We review various techniques forimage and video coding such as transforms, motion compensation, vector quantization, and subband coding. We outline the impact of the cell loss ratio (CLR), delay and cell delay variation (CDV) on video coding: blocking effects, loss of frame synchronization, motion vectors, and vector quantization codewords. The open problems include tuning coding parameters to the available QOS provided by the network.     

基于片段合并的胚胎电子细胞基因压缩方法

针对胚胎电子细胞中基因存储硬件消耗较大的问题,提出了一种基于基因片段合并的胚胎电子细胞基因压缩编码方法。在编码过程中,把问题转化为图着色问题,采用遗传算法对基因中的填充位(X位)进行兼容赋值,从而把基因片段合并为基本兼容基因片段,实现基因压缩。利用概率论的知识对采用基因压缩方法实现基因存储的新型胚胎电子细胞结构的硬件消耗进行了理论分析。以实际电路作为目标电路进行仿真,结果表明,上述方法能有效地降低基因存储的硬件消耗。     

基于稀疏编码的脑脊液图像快速识别模型

考虑到采用传统的图像分割算法很难准确地分割脑脊液(CSF)细胞图像,提出了一种基于稀疏编码的脑脊液图像快速识别模型。该模型首先利用稀疏编码提取图像中的局部特征以及特征描述子,然后将特征描述子转换成线性空间金字塔匹配(SPM)结构,最后将计算结果输入到线性支持向量机(SVM)中进行训练和预测。对脑脊液细胞图像做了异常识别和分类测试,其中异常识别准确率达到了89.4±0.9%,且对每张760×570的图像平均识别时间只需1.3s, 由此可以表明所提出的模型能够有效快速地区分脑脊液细胞是否异常。     

A coding optimized polarization conversion metasurface in broadband and wide‐angle

In this article, a coding optimized metasurface is proposed for linear polarization conversion in broadband and wide‐angle. Using an improved coding method, the geometry of the metallic structure and the size of the unit cell are encoded with a code sequence. The code sequence is optimized by genetic algorithm, considering bandwidth, efficiency, and angular stability. In this way, a coding optimized metasurface was obtained for polarization conversion in broadband and wide‐angle. It can convert linear polarized incidence to its orthogonal polarized reflection in 8 to 18.9 GHz and 0° to 45°, with the polarization conversion ratio larger than 80%. Both simulated and measured results demonstrated the effectiveness of the proposed metasurface. Hence, our method offers an effective strategy to design high‐performance polarization conversion metasurfaces.     

Optimal Channel Adaptation of Scalable Video Over a Multicarrier-Based Multicell Environment

To achieve seamless multimedia streaming services over wireless networks, it is important to overcome inter-cell interference (ICI), particularly in cell border regions. In this regard scalable video coding (SVC) has been actively studied due to its advantage of channel adaptation. We explore an optimal solution for maximizing the expected visual entropy over an orthogonal frequency division multiplexing (OFDM)-based broadband network from the perspective of cross-layer optimization. An optimization problem is parameterized by a set of source and channel parameters that are acquired along the user location over a multicell environment. A suboptimal solution is suggested using a greedy algorithm that allocates the radio resources to the scalable bitstreams as a function of their visual importance. The simulation results show that the greedy algorithm effectively resists ICI in the cell border region, while conventional nonscalable coding suffers severely because of ICI.     

Error Concealment Using Adaptive Multilayer Perceptrons (MLPs) for Block-Based Image Coding

Image coding algorithms such as Vector Quantisation (VQ), JPEG and MPEG have been widely used for encoding image and video. These compression systems utilise block-based coding techniques to achieve a higher compression ratio. However, a cell loss or a random bit error during network transmission will permeate into the whole block, and then generate several damaged blocks. Therefore, an efficient Error Concealment (EC) scheme is essential for diminishing the impact of damaged blocks in a compressed image. In this paper, a novel adaptive EC algorithm is proposed to conceal the error for block-based image coding systems by using neural network techniques in the spatial domain. In the proposed algorithm, only the intra-frame information is used for reconstructing the image with damaged blocks. The information of pixels surrounding a damaged block is used to recover the errors using the neural network models. Computer simulation results show that the visual quality and the PSNR evaluation of a reconstructed image are significantly improved using the proposed EC algorithm.     

FPGA在窑炉温度模糊控制中的应用设计

本文主要是探索利用FPGA来实现窑炉温度模糊控制的软硬件方面的应用设计方法,在硬件方面将数据总线、译码单元、及大部分逻辑电路集成于一片FPGA之中,这样可大大缩小了印制板的面积并提高了系统町靠性;同时在软件方面,由于FPGA的现场可编程特性,使得软件编程非常简单。系统在灵活性、二次开发上具有明显的柔软性。最主要的是利用FPGA来实现一种模糊控制的新思想．并应用于窑炉温度模糊控制系统之中。     

基于Java的校园GSM短信服务平台的设计与实现

手机短信成为人们的主要通信方式之一,尤其是短信通信和计算机数据库的结合,已经成为企业单位内部传递更新资讯的重要手段;基于PDU的UCS2编码设计了一个校园短信平台的方案,用于学生通过手机短信查询成绩,并用Java实现了该方案。     

基于Java的校园GSM短信服务平台的设计与实现

手机短信成为人们的主要通信方式之一,尤其是短信通信和计算机数据库的结合,已经成为企业单位内部传递更新资讯的重要手段;基于PDU的UCS2编码设计了一个校园短信平台的方案,用于学生通过手机短信查询成绩。并用Java实现了该方案。     

基于协同交互式遗传算法的复杂产品概念设计

针对复杂产品概念设计中的方案求解问题,建立了基于进化思想的求解过程模型,提出了一种新的基于协同进化算法与交互式遗传算法相结合的复杂产品概念设计方法.针对手机概念设计中功能设计的特点提出了变长度编码和两层编码的混合编码方式.实例表明,该方法对多目标、人机交互的复杂产品概念设计方案求解是有效的.