基于LS MPP的流处理技术研究

为了提高LS MPP(Li-Shan MPP)系统的性能,并将其纳入新型嵌入式流处理器之中.以LS MPP体系结构为基础,根据嵌入式流处理器概念模型,针对图像处理应用的特征,提出了基于LS MPP的流处理技术.该技术通过定义新型流数据类型和核函数,构造了流处理模型,并分析了以LS MPP为基础提出的嵌入式流处理器概念模型上的流调度的实现方法,为全面提高LS MPP嵌入式流处理器的性能提供了系统软件支持.     

LS MPP数据并行C语言编译器实现的研究

大规模并行处理技术是并行计算研究的一个热点问题,文章针对LS MPP嵌入式大规模并行处理机提出了一个数据并行C语言编译系统的实现方案,并对其中的代码分离、数据分布、节点程序生成等关键技术的实现进行了详细的阐述。     

LS MPP嵌入式计算机的系统软件设计

LS MPP是西安微电子技术研究所自行研制出的面向航空嵌入式应用的大规模并行图象处理机。其宿主机为自行研制的32位浮点RISC芯片，图象协处理系统为自行研制的MPP协处理器。文章论述了LS MPP计算机的系统软件设计，包括汇编程序、监控程序和C编译程序。     

LS系列嵌入式计算机汇编程序的一体化研究

文章通过LS－RISC、LS－MPP和LS－DSP嵌入式计算机指令系统的详细比较,对这三个系统汇编程序一体化的可行性进行了研究,提出了实现其汇编程序一体化的方案。     

兰州理工大学计算机与通信学院精品课程简介

《计算机高级语言程序设计》是计算机基础教育的重要课程,是工科学生的一门必修课,它是普及计算机三个层次教育的重要环节。该课程的目的是使学生通过对计算机高级语言的学习来提高学生计算机语言的编程能力,从而提高学生的计算机应用水平,为后续课程的学习中能熟练使用计算机而打下基础。     

计算机高级语言逆编译技术的相关探究

计算机之中的"高级语言"对机器没有依附性,它只是通过"机器"的不同平台,在自身程序不发生改变的情况下,依靠逆编译技术所设置成的"特定代码",然后与各种平台进行程序上的适应。文章针对计算机之中的高级语言在逆编译技术上的各种知识以及状况进行探究,解决大家对"高级语言"的种种疑惑。     

逆编译中用户自定义库函数识别技术研究

静态库函数分为系统库函数和用户自定义库函数,它的识别问题一直是反编译技术的难点,特别是对于用户自定义库函数,由于通用性低,信息获取困难,因而这方面的研究很少.分析用户自定义库函数在存储器中的存储方式和特征,提出一种用户自定义库函数的识别方法,首次采用两级中间语言(低级中间语言和高级中间语言)的形式进行处理,对中间语言的生成、函数伪代码模块的提取、识别模板的建立等关键技术进行详细的分析研究,最后给出识别实例.实践证明具有较高的应用价值.     

采用MATLAB中的xPC Target对硬件进行操作

如何在高级语言的编程环境中方便地进行数据采集等直接对硬件的操作，从而同时兼备有语言和低级语言的编程优点？MATLAB中的xPC工具提供了这样的功能。     

基于层次模型的C语言程序设计课程教学改革研究

作为国内外广泛流行,并有着广阔发展前景的计算机高级语言,C语言一直受到业界关注,其中针对C语言的课程教学改革就是研究热点之一.随着企业对IT人才的需求不断演变以及教学改革的不断深入,传统的C语言教学存在的问题越来越凸显.针对这些问题,本文在进行深入研究和不断实践的基础上,创新性的设计了一种基于层次模型的C语言程序设计教学模式.实践证明,该模式对C语言教学实践及研究有着一定的促进作用.     

FoxBASE与高级语言接口程序的设计

在计算机的应用编程中，经常会遇到在ＦｏｘＢＡＳＥ环境下使用高级语言的问题。本文通过实例及对数据库结构的分析，介绍了ＦｏｘＢＡＳＥ与高级语言接口程序的功能、原理及简单的设计方法。     

基于二维网孔互连网络的并行矩阵乘算法

矩阵乘法是数值分析领域中一种十分常用的基本运算，被广泛应用于模式识别、图像和信号处理。由于矩阵运算具有局部性、一致性的特点，特别适合用二维网孔并行计算机来实现。文章讨论了基于二维网孔互连网络的矩阵乘并行算法的实现，首先给出了一种正方网孔处理机阵列的并行算法，然后将其推广到长方网孔处理机阵列中。最后通过在LSMPP计算机的应用，证明算法是可行的、有效的。     

C代码在DM642中的优化

DM642中的C编译器可以将C语言程序自动编译转化为C6000DSP汇编程序,这样开发者就可以直接利用高级语言实现DSP软件的初步设计,缩短开发周期。但面向DSP的C语言程序是针对极少数据点的实时处理过程,因而需要对C代码进行优化,以满足实时性。在此以一个图像压缩算法JPEG在TMS320DM642中的实现为例,简要说明C代码在DM642中的优化过程。     

FPGA-based parallel ASIP architecture for reactive systems

A scalable parallel ASIP architecture based on FPGAs suitable For the implementation of reactive systems is described. The specification language used is extended statecharts. An industrial example requiring the real-time control of several stepper motors illustrates the benefits of the approach     

程控交换软件中多任务系统单任务化研究

本文在比较了用多任务模型描述一个多任务实时控制系统和用单任务消息驱动的方式实现这个系统的特点之后指出：只要给多任务模型作适当的修改和限制，那么多任务系统单任务化是可以自动实现的。这样设计者既可以用多任务模型很方便地描述一个系统，又可以用自动生成的、可以在单任务操作系统下高效运行的消息驱动程序去实现这个系统。根据这个思想，本文定义了Ｄ语言，并给出了Ｄ编译器的主要思想。     

Easy-hardware-implementation MMPF for Maneuvering Target Tracking: Algorithm and Architecture

In this paper, we present an easy-hardware-implementation multiple model particle filter (MMPF) for maneuvering target tracking. In the proposed filter, the sampling importance resampling (SIR) filter typically used for nonlinear and/or non-Gaussian application is extended to incorporating multiple models that are composed of a constant velocity (CV) model and a “current” statistical (CS) model, and the Independent Metropolis Hasting (IMH) sampler is utilized for the resampling unit in each model. Compared with the bootstrap MMPF, the proposed MMPF requires no knowledge of models and model transition probabilities for different maneuvering motions, and keeps a constant number of particles per model at all times. This allows a regular pipelined hardware structure and can be implemented in hardware easily. Furthermore, using the IMH sampler for the resampling unit avoids the bottleneck introduced by the traditional systematic resampler and reduces the latency of the whole implementation. Simulation results indicate that the proposed filter has approximately equal tracking performance with the bootstrap MMPF. Hardware architecture of the IMH sampler and its corresponding sample unit are presented, and a parallel architecture consisting of CV model processing element (PE), CS model PE and a central unit (CU) is described. The proposed architecture is evaluated on a Xilinx Virtex-II Pro FPGA platform for a maneuvering target tracking application and the results show many advantages of the proposed MMPF over existing approaches in terms of efficiency, lower latency, and easy hardware implementation.     

A simple and effective static gesture recognition method based on attention mechanism

To solve the problem of low sign language recognition rate under the condition of small samples, a simple and effective static gesture recognition method based on an attention mechanism is proposed. The method proposed in this paper can enhance the features of both the details and the subject of the gesture image. The input of the proposed method depends on the intermediate feature map generated by the original network. Also, the proposed convolutional model is a lightweight general module, which can be seamlessly integrated into any CNN(Convolutional Neural Network) architecture and achieve significant performance gains with minimal overhead. Experiments on two different datasets show that the proposed method is effective and can improve the accuracy of sign language recognition of the benchmark model, making its performance better than the existing methods.     

Parallel data resampling and Fourier inversion by the scan-line method

Fourier inversion is an efficient method for image reconstruction in a variety of applications, for example, in computed tomography and magnetic resonance imaging. Fourier inversion normally consists of two steps, interpolation of data onto a rectilinear grid, if necessary, and inverse Fourier transformation. Here, the authors present interpolation by the scan-line method, in which the interpolation algorithm is implemented in a form consisting only of row operations and data transposes. The two-dimensional inverse Fourier transformation can also be implemented with only row operations and data transposes. Accordingly, Fourier inversion can easily be implemented on a parallel computer that supports row operations and data transposes on row distributed data. The conditions under which the scan-line implementations are algorithmically equivalent to the original serial computer implementation are described and methods for improving accuracy outside of those conditions are presented. The scan-line algorithm is implemented on the iWarp parallel computer using the Adapt language for parallel image processing. This implementation is applied to magnetic resonance data acquired along radial-lines and spiral trajectories through Fourier transform space.     

视频目标检测跟踪程序在多核DSP上的并行实现

高性能多核 DSP 的通信以及并行执行是多核系统设计的关键.文章分析了视频目标跟踪算法各模块的资源消耗,对各部分算法提出了并行计算的思路;提出改进的二值化掩膜法提取背景图像;提出辅助并行结构以使负载均衡;研究了 DSP多核通信的进程间通信(IPC)同步机制,运用流水线并行结构,实现三核同步并行处理系统.通过实验,测试了通信延迟时间,并把目标跟踪程序合理地划分到3个 DSP核中,实现并行处理,达到了实时性要求.