基于细节分量提取的脉压雷达信号检测技术

小波分解可以将信号分解为多层近似分量与细节分量，脉压雷达信号的脉内信息可以在细节分量中得到很好的体现，因此小波变换方法对脉压信号有着很大的优势。Mallat快速算法使小波变换走向工程实用成为可能，对ADC输出的数据流做小波分解，得到各层的细节分量，找到波形失真较小并且能够反映脉内特征的细节分量作为新的数据源，对之进行相关处理，完成信号检测。文章最后以实际雷达信号为对象进行了实验，实验结果表明该方法是切实可行的．     

A data optimization test technique for characterizing embedded ADCs

A novel data optimization test technique is presented which utilizes a BIST structure, an ADC model and histogram data to characterize embedded ADCs. A practical 8 bit ADC is modeled and then characterized using 20% less data points then conventional analysis with a 78% reduction in the amount of data required to be shifted off-chip. Comparisons between theoretical, modeled and practical results are also made in the paper.     

Size of monochromatic components in local edge colorings

An edge coloring of a graph is a local r coloring if the edges incident to any vertex are colored with at most r distinct colors. We determine the size of the largest monochromatic component that must occur in any local r coloring of a complete graph or a complete bipartite graph.     

基于嵌入式系统的线程池研究

服务器响应客户请求一般采用并发式服务,但普遍存在着开销大及资源不足等问题,而线程池技术是解决这些问题的一个良好解决方案.在POSIX线程库研究的基础上,提出了以ARM9为硬件平台进行嵌入式服务器线程池设计,并优化了线程池设计的几个关键问题.     

All-optical wavelength converters for optical switching applications

We present the latest results about all-optical wavelength conversion obtained within the European Union—funded RACE ATMOS project. In particular, solutions based on carrier depletion in Distributed Brag Reflector lasers have reached penalty-free polarization-insensitive operation at up to 2.5 Gbit/s, while solutions based on Semiconductor Optical Amplifiers (SOAS) under cross-gain modulation have been demonstrated at more than 20 Gbit/s. The study of cross-phase modulation in SOAs has also been performed, leading to the monolithic integration of SOAs within an interferometer, according to structures proposed by the project. Penalty-free operation at up to 10 Gbit/s as well as signal reshaping have been obtained with such devices. Besides the study of components, wavelength converters have been used in several demonstrators assessing their maturity and compatibility with photonic-switching applications.     

A spatially layered hierarchical approach to video coding

Layered techniques offer attractive features for video coding in several applications including high definition TV (HDTV). After describing these in general, we propose an approach in which the layering is performed in the pel domain using a modified version of the conventional spatial pyramid technique. Comparisons are made with the alternative methods of subband coding and layering of DCT coefficients. Results with HDTV pictures were first demonstrated on 3 November 1992.     

嵌入式大屏幕LED显示屏的设计与实现

鉴于传统的LED显示规模小、可靠性差、需要上位机实时控制的问题,提出一种基于FPGA和2片SRAM的嵌入式大屏幕LED显示的方法,其显示规模达到512×512点阵列,并且可以在完全不需要上位机控制的情况下实时独立的工作。本设计已经实际使用在现场厂房中,能够较好地对厂房中的生产情况进行实时显示。着重讨论该系统最底层的硬件连接及相应的软件设计,并给出其软、硬件实现。     

Geometric Ergodicity of Gibbs and Block Gibbs Samplers for a Hierarchical Random Effects Model

We consider fixed scan Gibbs and block Gibbs samplers for a Bayesian hierarchical random effects model with proper conjugate priors. A drift condition given in Meyn and Tweedie (1993, Chapter 15) is used to show that these Markov chains are geometrically ergodic. Showing that a Gibbs sampler is geometrically ergodic is the first step toward establishing central limit theorems, which can be used to approximate the error associated with Monte Carlo estimates of posterior quantities of interest. Thus, our results will be of practical interest to researchers using these Gibbs samplers for Bayesian data analysis.     

嵌入式微处理器的高层总线缓冲模型

本文针对嵌入式微处理器结构特征,提出了一种高层总线缓冲模型.随后根据提出的缓冲模型设计仿真算法,并根据实际的设备行为进行抽样统计分析,实现了带有缓冲设备的高层动态仿真.结果显示高层的仿真结果反映了实测电路级仿真的数据趋势,具有很好的一致性,证明了高层模型及仿真的有效性.     

Bayesian hierarchical linear mixed models for additive smoothing splines

Bayesian hierarchical models have been used for smoothing splines, thin-plate splines, and L-splines. In analyzing high dimensional data sets, additive models and backfitting methods are often used. A full Bayesian analysis for such models may include a large number of random effects, many of which are not intuitive, so researchers typically use noninformative improper or nearly improper priors. We investigate propriety of the posterior for these cases. Our findings extend known results for normal linear mixed models to certain cases with Bayesian additive smoothing spline models. Supported by National Science Foundation grant SES-0351523 and by National Institutes of Health grants R01-CA100760 and R01-MH071418.