飞腾处理器网络控制器的驱动设计和实现

随着飞腾处理器性能的提升,原来的网络驱动已经不能满足其需求,急需设计和实现一款针对当前处理器的特性,能最大程度发挥其性能的网络驱动。通过研究飞腾处理器网络控制器相关的硬件原理以及linux下驱动框架的知识,设计和实现飞腾处理器中网络控制器的驱动,并对其进行了优化,使其达到了千兆网卡的使用需求。     

Vxworks下的冗余CAN通讯模块设计

本文介绍了航天应用领域中CAN总线的多种冗余方法，重点论述了在实时操作系统vxworks下基于ARM处理器的二模（DRM）CAN冗余的硬件设计和软件驱动程序设计过程，并在空间六自由度机器人通信平台中得到实现。     

飞腾1500A处理器性能分析工具Likwid研究

在飞腾1500A处理器平台对程序性能分析工具Likwid展开研究,主要研究了飞腾1500A处理器硬件拓扑信息的获取、性能监测单元PMU的访问以及性能分析工具的使用和数据分析。通过hwloc获取飞腾1500A处理器的硬件信息,给程序员提供关于飞腾1500A处理器的拓扑结构及相关概要信息;编写内核驱动模块使能飞腾1500A处理器的性能监控单元,指定事件类型,通过对应硬件计数器记录目标程序执行过程中事件发生的次数;结合简单代码和模板化的微基准测试程序,使用性能分析工具收集程序执行过程中相关数据,进行性能分析。     

FPGA及动态可重构技术在软件无线电中的应用

介绍了将现场可编程门阵列(FPGA)专用硬件处理器集成到软件通信体系结构(SCA)中的机制,实现了动态部分可重构技术在软件无线电(SDR)硬件平台中的应用,有效地缩短系统开发周期,提高了硬件资源的利用率.     

基于FPGA的实时心电监护系统设计

介绍了一种基于现场可编程门阵列(FPGA)的实时心电监护系统。该系统采用FPGA为中央数字处理器,采用硬件描述语言(VHDL)进行结构化设计,实现了心电信号(ECG)的实时采集、处理和传送。同时还在芯片内集成了数字滤波和数据压缩存储算法,实现心电信号的实时处理和压缩。     

基于飞腾平台TOE协议栈的设计与实现

传统TCP/IP协议栈要占用大量计算和访存资源,主要表现在中断上下文切换、协议处理和数据拷贝三方面。为减轻飞腾处理器计算负载,逐步采用软硬件一体化即协议卸载引擎（TCP/IP Offload Engine）技术,用硬件部分或全部实现TCP/IP协议处理。因飞腾平台处理器频率较低,网络负载较重时容易成为网络I/O瓶颈。文中对TCP/IP卸载引擎（TOE）技术及其相关原理进行研究,设计并实现了飞腾平台TOE协议卸载引擎的驱动,利用TOE对飞腾平台的网络性能进行优化。测试表明：飞腾平台使用TCP/IP卸载引擎能提高网络吞吐量并减少CPU利用率。     

计算资源共享平台中基于分类器的可用性预测

提出与描述了计算资源共享平台中的网络资源的可用性预测方法,该方法使用了基于数据挖掘的分类器算法,采用了分布式数据收集器工具,该工具运用收集数据和跟踪数据的方式来获取的预测的可用性的信息,从而完成资源的使用情况的预测。讨论了实现资源可用性预测的软件框架,描述了资源预测的具体过程。实验结果表明,即使在高挥发性的分布式计算平台中,该资源可用性预测技术能够很好地预测计算资源共享平台中机器的处理器利用率、内存的负载、机器的可用性,为调度器和副本备份提供参考。     

海洋工作平台的温湿度监控系统的设计

介绍了一种应用在海洋工作平台上的温湿度监控系统,采用ARM Cortex-M3处理器为系统核心工作组件,设计了监控系统的硬件、软件结构.系统有3个组成单元:温湿度监测单元、最小系统单元和控制单元,并从这3个部分对系统的硬件和软件设计进行了详细说明.实践证明,该系统能够有效实现多点温湿度的采集、监控和数据管理,确保了海上工作平台中仪表的正常工作和运转.     

Gauntlet for Unix 4.2已上市

Gauntlet for Unix 4.2版防火墙现已上市,该防火墙具有一个易用的界面和企业管理功能以及防垃圾邮件和防中转功能。 Gauntlet for UNIX防火墙是一种基于硬件和软件的应用网关防火墙,仅支持那些防火墙管理员专门配置的应用,以及能够安全实现的应用。它既可以预先安装在基于奔腾处理器的平台上,也可以以软件包的形式预先安装在BSD/OS、Solaris、HP-UX和其它操作平台中。     

ARM计算环境下堆芯程序的移植

为了论证国产芯片在堆芯数值计算领域的可行性,对多个堆芯程序在飞腾处理器的ARM通用计算环境中进行了移植,涉及堆芯燃料管理软件的扩散原型程序NACK-R、子通道分析程序CORTH、特征线输运程序OpenMOC和堆芯组件程序KYLIN2。移植过程在ARM计算环境中通过合理的程序代码修订,去除对商业函数库的依赖,且在移植过程中对KYLIN2的特征线循环扫描计算过程引入OpenMP多线程并行,论证单结点多个飞腾处理器核心的并行能力。参照对象Intel商用处理器的频率约为飞腾处理器频率的2倍,堆芯程序移植后的串行运行效率与在Intel计算环境中的串行运行效率差异保持在3~4倍,受限于所使用飞腾处理器型号的缓存大小,部分数据量较大例题的性能差异可能更大。KYLIN2完成多线程并行后计算效率接近在Intel处理器上的串行效率,证明单结点多个飞腾处理器核心能够替换部分堆芯数值计算既有的应用场景。移植结果也表明,混合不同处理器的异构设计,能够在计算资源紧张的情况下充分利用国产硬件,提升计算环境的整体利用效率。     

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.     

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.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate