面向医用电子内窥镜的高清视频处理系统

设计一种基于现场可编程门阵列(FPGA)和双数字信息处理器(DSP)的嵌入式高清内窥镜视频处理系统。利用FPGA对视频数据进行预处理,采用2片基于DaVinci-HD技术的DSP进行H.264编解码并行运算,通过PowerPC处理器完成系统管理、视频存储与网络传输。测试结果表明,该系统实时处理的视频分辨率达到1080i60,在图像质量上能达到H.264的高画质级别。     

多核DSP和FPGA之间的高速SRIO通信

在高速采样系统中,大量数据需要实时传输到处理器.尤其是系统中存在多个处理器协同工作,就需要高速的总线来交换数据.SRIO总线由于存在连线少、传输速度高等优点,使用较为广泛.本文介绍了多核DSP和FPGA之间使用SRIO进行数据交换的软硬件设计方法,在不同数据需求下,介绍了FPGA将数据直接传输到DSP的DDR3、片内RAM或者多核的共享RAM中.本文研制了硬件系统,给出了各种方式的软件操作方法和实际硬件平台验证,SRIO传输速率达到4 Gbps.     

高性能PCI驱动程序的关键技术

为了提高基于PCI互连多处理器之间大量数据的有效传输,提出了一种针对PCI设备数据传输的驱动程序设计方法.首先描述了嵌入式处理平台由通用处理器PowerPC与数字信号处理器(DSP)组成,DSP处理器需要将处理的图像及视频等数据发送给PowerPC处理器,PowerPC负责事务性管理及远程网络传输,然后讨论了Linux操作系统下PCI数据传输驱动程序设计的关键技术,如DMA传输技术、零拷贝技术等.通过在PowerPC和DSP双处理器平台上进行编程测试,实验结果表明,采用该关键技术设计的PCI驱动程序明显提高了PowerPC与DSP之间的数据传输能力.     

采用SRIO协议实现多DSP实时系统图像数据传输

针对高速实时图像处理系统数据量大、算法复杂度高等特点,从系统的处理性能、缓存容量、传输带宽三个要点考虑,设计了一种基于FPGA+4DSP架构的实时图像并行处理系统,使用SRIO互连技术取代传统EMIF方式实现DSP间、DSP与FPGA中间的数据传输。实验结果表明,系统传输带宽峰值为312.5 MB/s,这种新的嵌入式实时图像处理平台能够实时采集传输处理1k?1k@100 f/s高分辨率图像数据,并且具有可靠性高、通用性强、灵活性好的优点。     

FPGA和DSP间基于SRIO的高速通信系统设计

现代信号处理系统通常需要在不同处理器之间实现高速数据通信,SRIO协议由于高效率、低延时的特性被广泛使用.本文研究了在FPGA和DSP两种处理器之间实现SRIO协议的方法,并通过电路设计和利用处理器的开发工具编程实现了两种处理器间的高速通信.经测试,该系统具有较高的传输效率.     

实时图像采集系统的DMA通道设计

将数字图像数据实时传送到DSP系统中进行处理,可采用多种方法完成;为了保证数字图像数据采集和处理的实时性,提出一种利用FPGA和一定容量的SRAM的DMA实现方法,通过以状态机为核心的逻辑控制实现一种大容量的组合式的FIFO作为DMA与外部数据传输的通道,整个通道通过DSP的EMIF接口实现与DMA控制器无缝接口,提高了DSP与外部数据交换的速度,适用于DSP和FPGA为主要组成的视频实时图像处理系统,数据传输率可达35M×32bit/s,实现了实时传输整幅视频图像数据的目的,使得数字信号处理器及时处理图像数据不产生延迟,提高了系统的数据处理能力和响应能力。     

基于FPGA的视频图像处理器的串行通信设计

提出了一种在FPGA上实现视频图像处理器分系统与系统之间的数据串行通信设计方法,采用UART串行数据传输协议,传输波特率可设置调整,采用视频场同步信号作为发送器发送控制信号,实现视频图像处理的实时性要求。串口采用双口RAM实现与视频图像处理部分的异步通信。设计中大量采用参数化设计,使用灵活、通用性强,可实现FPGA与一般串口通信系统通信。设计程序下载到FPGA芯片中,通信数据完全正确,电路工作稳定、可靠。     

基于FPGA高速实时图像数据处理系统的研究

本文对在FPGA中嵌入Powerpc(hard IP Core),引入linux嵌入式操作系统用来开发嵌入式系统进行了研究,系统实现了高速数据采集、高速视频数据压缩、实时视频数据的网络传输和实时压缩图像数据存储功能,该方法采用linux嵌入式操作系统加FPGA中嵌入的Powerpc硬核处理器进行系统控制层面的处理,还根据FPGA的特点将视频处理等功能用高速硬件实时处理。系统适合于系统空间要求小且视频数据处理量大的应用。     

4K视频流异构多核的多路分屏方法

针对视频多屏显示系统无法依据分屏数量进行超高清视频自适应分屏传输的问题,提出了异构多核的视频流传输方法。该方法首先采用基于ARM处理器的嵌入式系统实现多任务处理与实时监控;然后通过FPGA实现对视频流的接收、转换、处理及分屏输出显示的硬件加速。系统可以根据输入信号实时配置FPGA的工作参数,实现分辨率和分屏数量可变的超高清视频流分屏显示。最后采用Zynq UltraScale+MPSOC XCZU7EV多核异构处理器开发平台对本文系统进行测试,结果表明：4K视频多路分屏画面拼接无明显错位,同步一致,较好地满足了视频多路分屏显示要求。     

一种高性能信息处理电路设计

设计了一种DSP+ZYNQ的高性能信息处理电路,并且具有SRIO高速嵌入式系统互联接口.该电路DSP具有8个C66x核,ZYNQ具有一个Xilinx7系列的FPGA和一个双核ARM,基于FPGA实现了SRIO高速通信接口.因此,该电路具有高性能的计算能力、逻辑控制能力、丰富的存储资源和高速的数据传输接口.该方法工程实现简单,达到了实际工程应用状态,在高性能信息处理电路方面,具有较高的应用推广价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.