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CSCW分布式多任务协作机制的研究 总被引:6,自引:1,他引:5
文中对CSCW的多任务协作机制作了深入的研究,系统地描述了多任务协作机制的基本概念和研究内容。给出了一个由群体服务器,应用服务器和应用工具组成的三层结构和多任务协作模型,并重点介绍了基于此模型用Java语言在PJVM开发平台上实现的一个原型系统--“网络围棋俱乐部”,该系统可运行在由Unix(Solaris2.4)和Windows(95.NT)组成的异构型网络上。 相似文献
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神经元网络控制系统——局部操作网络(LON)控制系统NeuralNetworkControlSystem┐LocalOperatingNetwork(LON)ControlSystem●李江涛黄健民LiJiangtaoHuangJianmin当今自动... 相似文献
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统计数据凑整问题的网络流算法金大勇,杨承恩(长沙铁道学院)NETWORKALGORITHMSFORTHEDATAROUNDINGPROBLEM¥JinDa-yong;YangCheng-en(ChangshaRailwayInstitute)Abst... 相似文献
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基于WWW的仿真软件JRTSS(Java-basedRealTimeSystemSimulator)以RTSS仿真软件为基础,保持其原有特色,并采用Java为编程语言,运行在Browser/Server环境下。JRTSS软件由三部分组成:仿真核心、建模程序与结果后处理程序。其中仿真核心运行在Server端,建模和结果后处理程序为JavaApplet,由用户的Browser下载并执行。JRTSS的系统模型是一个开放队列网络。通过在不同抽象层次对多个数据采集与处理系统、通信网络以及柔性制造系统的仿真与性能评价,证实JRTSS是一个用于系统开发的有力工具。 相似文献
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(接上期) 佳能BJC-7100是适合SO-HO使用的彩色喷墨打印机,价格约在1700元左右。它拥有七色打印的特性,大大提高了彩色打印效果,但这款机型也已停产,市面上仍可见到。 Canon BJC-3000是替代BJC-7100的产品,与BJC-7100不同的是它只有四色独立墨盒,在打印分辨率上提高了不少。值得一提的是Canon的 BJC 50和BJC80,这两款均系便携式设计,适合笔记本用户和一些具有特殊需要的用户。 Epson Stylus Color 460是市场上唯一低于千元的Epson公司的产… 相似文献
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Feature_basedIntegratedCAD/CAPP/CAMSystemForConcurentEngineringWangHuichengZhangXinfangZhouJi(CADCenterofH.U.S.T)AbstractThis... 相似文献
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Java平台及应用Java技术的安全问题研究 总被引:2,自引:0,他引:2
本文对Java安全体系结构做了比较详细的学习与探讨,并对Java安全体系中的Java安全体系结构的核心,Java加密体系结构(JCA),Java加密扩展(JCE),Java认证与授权服务(JAAS),Java安全套接扩展(JSSE)逐一进行分析。为基于Web的分布式应用程序提供了一个综合框架。 相似文献
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性能问题一直是Java无法回避的一个弱点。然而造成性能低下的原因除了Java本身的原因外,很多时候是由于应用没有优化地使用Java造成的。虚拟机是Java平台的核心,研究Java虚拟机(Java virtual machine,简称JVM)的关键技术及运行机制,并分析其性能优化措施,使Java在不同的平台上顺利运行,为编程实现JVM或向各种平台移植JVM提供参考。 相似文献
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Java card is a new system for programming smart cards,which is based on the Java language and Virtual Machine,Java card programs(applets)run in Java Card Runtime Environment (JCRE)including the java Card Virtual Machine(JCVM),the framework,the assoicated native methods and the API(Application Programming Interface),JCVM is implemented as two separate pieces: off-card VM(Virtual Machine)and on-card VM.The stack model and heap memory structure used by on-car VM and exception handling are introduced.Because there are limited resources wihin smart card environment,and garbage collection is not supported in JCVM,the preferred way to exception handling does not directly involve the use of throw,although the throw keyowrd is supported.Security is the most important feature of smart card.The Java Card applet security feature is also discussed. 相似文献
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《Advances in Engineering Software》2000,31(8-9):743-751
This panel session focuses on utilization of Java for numeric-intensive applications, including the advantages and disadvantages of Java for future use with industrial independent software vendor (ISV)-based finite element methods (FEM) codes. Discussion will address both partial use of Java and/or complete code implementation; activities in this area are already in progress and have been reported by the Java Grande Forum (see http://www.javagrande.org). Some of the issues that will be discussed by the panelists and audience include: performance comparisons of Java, Fortran, C, and C++; primary deficiencies of Java with respect to future development of competitive commercial ISV-based FEM codes; Java standardization bottlenecks; strategies for transitioning to Java from existing large legacy commercial codes; current and future numeric-intensive benchmarks; actions to improve Java floating-point performance. This session is represented by biographical sketches of the panel participants, their individual reflections on the panel theme, and a list of related Internet references. 相似文献
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Early Java implementations relied on interpretation,leading to poor performance compared to compiled programs,Java just-in-time(JIT) compiler can compile Java programs at runtime,so it not only improves Java‘s performance prominently,but also preserves Java‘s portability.In this paper the design and implementing techniques of Java JIT complier based on Chinese open system are discussed in detail.To enhance the portability,a translating method which combines the static simulating method and macro expansion method is adopted.The optimization technique for JIT compiler is also discussed and a way to evaluate the hotspots in Java programs is presented.Experiments have been conducted to verify JIT compilation technique as an efficient way to accelerate Java. 相似文献
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Roberto R. Expósito Guillermo L. Taboada Juan Touri?o Ramón Doallo 《The Journal of supercomputing》2012,61(1):141-165
This paper presents ibvdev a scalable and efficient low-level Java message-passing communication device over InfiniBand. The continuous increase in the number of cores per processor underscores the need for efficient communication support for parallel solutions. Moreover, current system deployments are aggregating a significant number of cores through advanced network technologies, such as InfiniBand, increasing the complexity of communication protocols, especially when dealing with hybrid shared/distributed memory architectures such as clusters. Here, Java represents an attractive choice for the development of communication middleware for these systems, as it provides built-in networking and multithreading support. As the gap between Java and compiled languages performance has been narrowing for the last years, Java is an emerging option for High Performance Computing (HPC). The developed communication middleware ibvdev increases Java applications performance on clusters of multicore processors interconnected via InfiniBand through: (1) providing Java with direct access to InfiniBand using InfiniBand Verbs API, somewhat restricted so far to MPI libraries; (2) implementing an efficient and scalable communication protocol which obtains start-up latencies and bandwidths similar to MPI performance results; and (3) allowing its integration in any Java parallel and distributed application. In fact, it has been successfully integrated in the Java messaging library MPJ Express. The experimental evaluation of this middleware on an InfiniBand cluster of multicore processors has shown significant point-to-point performance benefits, up to 85% start-up latency reduction and twice the bandwidth compared to previous Java middleware on InfiniBand. Additionally, the impact of ibvdev on message-passing collective operations is significant, achieving up to one order of magnitude performance increases compared to previous Java solutions, especially when combined with multithreading. Finally, the efficiency of this middleware, which is even competitive with MPI in terms of performance, increments the scalability of communications intensive Java HPC applications. 相似文献
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基于Java的视频监控系统中报警录像功能的实现 总被引:1,自引:0,他引:1
利用Java的平台无关性和完整的网络支持,开发出基于Java的视频监控系统.使用JMF(Java媒体框架)实现视音频捕获并每隔几秒截取监控区域的图像,利用Matlab进行图像对比并打包成Java程序,在监控区域出现异常情况时及时进行报警和录像.测试结果表明,系统的报警录像功能实用可靠,满足实时监控需求. 相似文献