OMAP L138核间通信高吞吐量图像处理平台及应用

异构双核芯片 AMR+DSP具有强大的任务管理、人机交互和数据处理功能,为嵌入式图像处理领域提供了一种新的架构。为了减少开发人员对底层驱动的设计,TI 研发了 Syslink 驱动用于核间通信,包括 Notify、MessageQ 协议等,其中基于 MessageQ的通信协议常用于核间图像传输,但其占用资源较多、延迟高。本文对 TI 公司的达芬奇架构OMAP L138处理器的多核通信理论进行研究,利用核间中断寄存器和共享内存队列存储机制进行数据交互,实现了一种高吞吐量的图像处理平台。     

基于OMAPL138与FPGA的惯性姿态测量系统设计与实现

为了满足高性能、低成本及多接口的惯导使用需求,设计一种基于OMAPL138+FPGA的大存储空间惯性姿态测量系统;系统设计充分利用OMAPL138的异构双核结构,结合每种处理器应用特点,进行任务划分并构建硬件平台;设计了丰富的外围接口,通过选择接入GPS、北斗或里程计,能够实现多种组合导航方式;根据使用环境提出惯导与里程计组合导航方案和相应软件流程,并进行了姿态精度测量及导航定位精度试验;姿态测量精度优于0.5密位,纯惯性导航定位精度为0.3‰ D (CEP),组合导航的定位精度为0.14‰,试验结果表明,系统稳定可靠,硬件平台满足惯导计算机设计需求。     

基于138平台的电能质量检测系统设计

现有的电能质量检测系统具有数据采集量和处理量大、实时性要求高等特点,并根据电力行业的发展现状,结合生产实际需求,提出了基于138平台+FPGA的分布式控制结构,以138平台为核心,充分发挥OMAPL-138平台DSP+ARM双核的优势,实现数据的高速率处理,通过FPGA实现通信协议的拓展,完成不同通信协议之间的转换,整体设计提高了系统的实时性和数据处理能力。该平台具有质量良好,稳定性好,具有一定的推广前景。     

Production of the Isomeric State of 138Cs in the Thermal Neutron Capture Reaction 137Cs(n, γ)138Cs

In order to obtain precise data of the neutron capture cross section of the reaction ¹³⁷Cs(n, γ)¹³⁸Cs, the production probability of isomer state ^138mCs was measured in this work. Targets of about 0.37MBq ¹³⁷Cs were irradiated for 3 min in. the pneumatic tube facility (Pn-3) of Kyoto University Reactor (KUR). The 1,436 keV gamma;-ray emitted from both of ^138gCs and ^138mCs was measured. A ratio of the production probability between ^138gCs and ^138mCs was deduced from time dependence of peak counts of 1,436 keV γ-ray by making use of difference of half-lives of ^138gCs (33.41 min) and ^138mCs (2.91 min). The production probability of ^138mCs was obtained as 0.75plusmn;0.18 and this value revised the effective cross section upwards by 9plusmn;2percnt;. The effective cross section ô and the thermal neutron capture cross section σo were obtained as ô=0.29±0.02 b and σ=0.27±0.03b with taking into account the production of ^138mCs.     

液晶滤色器用黄色颜料PY138的制备方法

液晶显示器用滤色片（CF）用三原色为红（R）、绿（G）以及蓝（B）。其中作为黄色用颜料,主要使用C．I．Pigment Yellow138,C．I．Pigment Yellow139以及C．I．PigmentYellow150。合成的粗品必须经过微细化以及稳定化的加工才可以作为液晶用有机颜料使用。     

Vector transport for shape-from-shading

In this paper we describe a new shape-from-shading method. We show how the parallel transport of surface normals can be used to impose curvature consistency and also to iteratively update surface normal directions so as to improve the brightness error. We commence by showing how to make local estimates of the Hessian matrix from surface normal information. With the local Hessian matrix to hand, we develop an “EM-like” algorithm for updating the surface normal directions. At each image location, parallel transport is applied to the neighbouring surface normals to generate a sample of local surface orientation predictions. From this sample, a local weighted estimate of the image brightness is made. The transported surface normal which gives the brightness prediction which is closest to this value is selected as the revised estimate of surface orientation. The revised surface normals obtained in this way may in turn be used to re-estimate the Hessian matrix, and the process iterated until stability is reached. We experiment with the method on a variety of real world and synthetic data. Here we explore the properties of the fields of surface normals and the height data delivered by the method.     

基于组合逻辑电路实现方法的探究

为缩短理论与实践的距离,提高灵活应用数字元器件的能力,提出了组合逻辑电路设计的第五步.组合逻辑电路设计通常有四步,设计完成画出符合功能要求的逻辑图,一般是把其转换成TrL与非门形式的逻辑图.第五步研究用多少个、何种逻辑门、译码器、数据选择器,怎样实现组合逻辑电路.实践证明,只要把逻辑电路与选择实现功能器件相互对应输入输...     

A comparison of design and model selection methods for supersaturated experiments

Various design and model selection methods are available for supersaturated designs having more factors than runs but little research is available on their comparison and evaluation. Simulated experiments are used to evaluate the use of E(s²)-optimal and Bayesian D-optimal designs and to compare three analysis strategies representing regression, shrinkage and a novel model-averaging procedure. Suggestions are made for choosing the values of the tuning constants for each approach. Findings include that (i) the preferred analysis is via shrinkage; (ii) designs with similar numbers of runs and factors can be effective for a considerable number of active effects of only moderate size; and (iii) unbalanced designs can perform well. Some comments are made on the performance of the design and analysis methods when effect sparsity does not hold.     

裂变产物中138Cs的分离

为了获得更精确的138Cs衰变数据,需要制备出放化纯的138Cs样品.以"两步延迟分离法"为基础,将抽气法与碘铋酸铯沉淀、硅钨酸铯沉淀法相结合,建立了从裂变产物中分离放化纯138Cs的分离流程.其化学回收率达(74±1) %,对主要γ核素的去污因子大于103,操作时间在60 min以内.