基于FPGA的阵列信号数据采集系统

针对阵列信号数据采集系统设计要求具有幅相一致、速度快、大数据量的特点,设计了一种基于FPGA的阵列信号数据采集系统。该系统以同步采样A/D转换器为核心,配合基于FPGA的控制单元,完成128路阵列信号同步采样功能。同时采用88E1111作为网络PHY芯片,完成与上位机之间的千兆位UDP通信,实现大数据量高速传输功能。经测试,系统实现了对128路阵列信号的采集与传输,具有良好的幅度一致性、相位一致性以及快速、稳定的特点。     

组通信中虚拟同步协议的研究与设计

在组通信中,虚拟同步通信是一个非常重要的通信模型,它保证组成员的失效不会导致消息的不完全传递。为了有效地支持分布式容错应用及协同应用的开发,在对与虚拟同步通信相关的失效检测问题及分布式一致性问题研究的基础上,将虚拟同步通信问题转换成一致性问题,提出了一个基于一致性协议的虚拟同步协议,并设计实现了一个虚拟同步服务。     

DV-MP32M嵌入式DVR

产品特色：该款DVR的优点是可提供32路全实时视频压缩，商时可进行四路同步回放，在人性化操作方面也下了些工夫。[第一段]     

一种基于数据状态同步的一致性策略研究

在传统的分布式系统中,修改数据后,通过数据同步复制的方式可以使多个节点保持数据的访问一致性,同时对主节点加锁,可以保证数据的写入一致性。但数据同步的方式会造成达到访问一致性的时间长、数据写入性能低。本文提出了一种基于数据状态同步的一致性策略,能够加快同步时间,提升写入性能。通过结合Zookeeper分布式协调服务设计了一种仅同步数据信息,完成对过期数据块的注销,从而保证数据的访问一致性,同时设计了分布式锁来确保数据写入的一致性。实验表明本文方法具有较低的同步时长,且并发写入性能更强。     

高功率脉冲半导体泵浦激光器阵列电源的设计

为满足高功率脉冲半导体泵浦激光器相干合成的特殊需要,设计6路同步输出的电源阵列,实现了工作电压0~400 V自适应调整、工作电流0~1 200 A、脉冲宽度200μs~1 000μs、重复频率1 Hz~20 Hz均可任意调整的高电压、大电流脉冲输出。在保证技术指标实现的同时,着重解决阵列电源的同步输出、电压自适应和可靠性保护等问题。试验结果表明,该阵列电源的同步一致性可达到99%,输出电流精度达到0.1 A,已在"六路激光相干合成"研究中得到应用。     

硬件结构支持的基于同步的高速缓存一致性协议

共享存储系统中如何高效地实现高速缓存一致性是体系结构设计面临的一个关键问题和难点问题.已有的基于目录的协议存在难于实现、验证复杂和存储空间开销大等问题.面向片上众核处理器,文中提出一种由硬件结构支持、基于同步的高速缓存一致性协议.该方案不使用目录,而是通过使用bloom-filter表示一致性信息,并在并行程序中的同步点维护高速缓存一致性.与现有的基于目录的高速缓存一致性协议相比,该方案可以降低目录协议的实现、验证复杂度.用SPLASH一2测试程序集评估表明,基于同步的协议可以获得与基于目录的协议相当的性能.     

基于NETBIOS的双机系统的设计与实现

双机设计是提高系统可靠性的一种方法。本文首先简要介绍了ＮＥＴＢＩＯＳ的概貌，网络控制块，命令和调用、接着论述了基于ＮＥＴＢＩＯＳ通信的双机系统的设计思想。特别地对会话创建，双机同步与故障判定，状态的切换与数据一致性的实现作了详细研究。     

Zynq平台的TTP/C总线控制器同步算法设计

为了保证TTP/C集群内各个节点之间时钟基准的一致性，设计了一种基于 Welch-lynch中值增量修正法的时钟同步算法，充分利用了Zynq芯片的可编程逻辑单元和程序处理单元，在自主设计的TTP/C总线控制器上对时钟同步算法进行实验。实验表明，所设计的时钟同步算法能够保证各个测试节点的时钟同步误差在±30μs范围内。     

协同编辑系统中保持共享对象一致性的研究

如何保持共享对象的一致性是实时协同设计中的核心问题。文中介绍了一种新颖的保持共享对象一致性的方法。根据协同图形编辑系统中操作冲突的特点,使用消息驱动机制,配合同步机制和冲突检测与消解机制,使得系统既能保持共享对象的一致性,又满足了实时协同设计中的响应性、因果顺序一致性,并最大限度地保持了用户的操作目的。     

基于Petri网的多媒体同步通信模型

本文提出了一种新的多媒体同步模型--交互式多媒体动态同步Petri网模型(IMDSPN)。IMDSPN能够准确地描述多媒体对象的各种同步时态关系，可以克服其表现过程中的同步失败问题，并可以保证在用户交互控制下同步关系的全局一致性，它有效地描述了多媒体的动态特性。     

A path planning algorithm for PCB surface quality automatic inspection

Journal of Intelligent Manufacturing - The surface quality inspection of industrial printed circuit board (PCB) is a vitally important link in its manufacturing process. To inspect surface defects...     

宿主机和并行处理机共享存储器模板的设计与实现

本文介绍了宿主机和并行处理机（MPP）之间采用共享存储器模板的数据交换方式,设计并实现了具有一定通用性的共享存储器模板。该模板采用主从式总线切换控制方法,存储器的组织方式可变,能够提供不同的访问带宽,可以为不同的宿主机和协处理机系统提供数据共享。     

MagicBoard: A contribution to an intelligent office environment

In this paper, we describe an augmented reality tool for collaborative work called the MagicBoard. The MagicBoard is based on an ordinary white board which has been enhanced by a video-projector and a steerable camera. A supervisor coordinates the cooperation of several modules including gesture recognition, finger tracking and white board scanning for digitalisation of the content. The gesture recognition module uses an approach based on local spatio-temporal appearance of activities. The tracking module is designed for use with cluttered backgrounds and variable lighting conditions. The white board scanner eliminates global luminosity differences by adaptive thresholding and the result can serve to digitise the content of the board. The supervisor is based on a rule-based architecture and is easily extendable. The selected modules fit together to a compact system, that largely increases the functionality of a white board and makes it a useful tool in the future office environments.     

A human reliability assessment of marine auxiliary machinery maintenance operations under ship PMS and maintenance 4.0 concepts

Cognition, Technology & Work - Maintenance is one of the core technical aspects on board ships, which is required for the ready availability, reliability, and efficiency of machinery equipment....     

一种用于系统互连的实时自主同步串行总线

针对当前小型化和高密度化的设计需求，提出了一种用于系统互连的实时自主同步串行总线，其能有效替代当前使用大量通用输入输出进行控制及指示信号传输的传统做法，实现更高效的系统板内及板间互连。     

基于SoPC的实时说话人识别控制器

运用软硬件协同设计,在DE2-70开发板上实现了一个基于SoPC的实时说话人识别控制器,控制器有很好的实时性和良好的识别性能。控制器的语音特征参数采用线性预测倒谱系数(LPCC),匹配算法采用动态时间规整算法(DTW)。     

Intel SIM8-01: A Proto-PC

The SIM8-01 prototyping board was introduced by Intel in 1972 as a low-cost hardware aid for the development of applications involving Intel's 8008 microprocessor. This article traces the SIM8-01's development at Intel and analyzes its impact on the formation of the first wave of worldwide microcomputer activities     

A single machine carryover sequence-dependent group scheduling in PCB manufacturing

This paper considers the problem of minimizing the makespan on a single machine with carryover sequence-dependent setup times. A similar problem with multi-machine flow shop usually arises in the assembly of printed circuit boards (PCBs). This research investigates the possibility of processing all components of PCBs using just one machine. By doing so the operational costs of having multi-machines can be reduced, and as a result, finding an optimal solution might be more plausible. The objective is to minimize the maximum completion time of all board groups, commonly known as makespan. The operational constraints are such that all board types within a board group must be completely kitted, as it is traditionally performed by kitting staff, before that board group begins its assembly operation. We introduce the external setup (kitting) time and require that it be performed solely by the machine operator during the run time of the current board group, and thereby completely eliminating the need for kitting staff. The carryover sequence-dependent setup time, namely the internal (machine) setup time, is realized when a new board group is ready for assembly operation and is dependent on all of the previously scheduled board groups and their sequences. To the best of our knowledge, this is the first time the external and internal setup times are integrated in PCB group scheduling research. We develop a branch-and-bound algorithm and a lower-bounding structure. The lower bound consists of two approaches, which enable the algorithm to simultaneously reduce performing unnecessary exploration. In order to test the efficiency of the algorithm, several problem instances with different board groups have been used. The algorithm developed requires a significantly large computation time to optimally solve very large problems. Thus to speak for the efficiency in terms of solving comparable large industry-size problems, we evaluate the deviation of the algorithm from the lower bound which turns out to be very small, with an average of only 6%, in all of the problem instances considered.     

基于双DSP的信号处理板的设计及其在SAR信号仿真中的应用

针对SAR信号仿真系统高速实时数据处理和传输的要求,本文设计并实现了基于双DSP结构的高性能实时信号处理板。该板使用两片TMS320C6416作为信号处理核心和数据流控制中心,使用PCI-PCI桥接芯片PCI2050B对PCI总线进行了扩展,并使用两片FPGA实现了内部高速互联通道和外部LVDS高速接口,具有很强的可重构性和可扩展性,并可在多种模式下工作。实测结果表明,该设计可完全满足SAR信号仿真的性能需求。