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In this article, we study the effects of network topology and load balancing on the performance of a new parallel algorithm for solving triangular systems of linear equations on distributed-memory message-passing multiprocessors. The proposed algorithm employs novel runtime data mapping and workload redistribution methods on a communication network which is configured as a toroidal mesh. A fully parameterized theoretical model is used to predict communication behaviors of the proposed algorithm relevant to load balancing, and the analytical performance results correctly determine the optimal dimensions of the toroidal mesh, which vary with the problem size, the number of available processors, and the hardware parameters of the machine. Further enhancement to the proposed algorithm is then achieved through redistributing the arithmetic workload at runtime. Our FORTRAN implementation of the proposed algorithm as well as its enhanced version has been tested on an Intel iPSC/2 hypercube, and the same code is also suitable for executing the algorithm on the iPSC/860 hypercube and the Intel Paragon mesh multiprocessor. The actual timing results support our theoretical findings, and they both confirm the very significant impact a network topology chosen at runtime can have on the computational load distribution, the communication behaviors and the overall performance of parallel algorithms. 相似文献
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面板模组是影响车载触摸屏触控性能和光学性能的关键因素,传统的人工检测方式已无法适应现代化工业生产高质量、高效率的需求。针对车载触摸屏面板透过率波动大、检测幅面大、检测精度要求高的难题,研发了一种基于机器视觉的车载触摸屏面板模组检测系统。根据车载触摸屏玻璃检测对象的特点,设计了基于线扫描的车载触摸屏玻璃图像采集系统和图像处理方案,通过对比标准灰度模型、建立灰度值和透过率转换关系、支持向量机分类等技术,实现多种缺陷的动态识别和玻璃屏任一点的透过率在同一台CCD下的测定。实验结果表明,通过图像校正处理和SVM训练,该车载触摸屏面板模组检测系统可同时满足多规格车载触摸屏模组的质量检测,最大尺寸为450mm×250mm,检测速度可达120pcs/h,检测精度达到0.01mm,缺陷检出率超过95%。 相似文献
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数据库管理员在任何地方都可以监控和优化数据库性能,对SQLServer数据库主要性能信息进行研究,采用了JNI、PDH、RMI技术和B/S结构实现系统,实现了一个J2EE架构下B/S结构的SQLServer性能监控系统,数据库系统管理员(DBA)通过本系统能以较小的维护代价实现数据库优良的性能。 相似文献
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针对电网动态谐波检测与电能计量的急切需求,建立了改善动态谐波FFT频谱泄漏和旁瓣效应的基于Blackman-Nuttall窗三谱线改进FFT校正的谐波电能计量方法,提出了ADS1178+TMS320C6745+K60架构的新型三相动态谐波电能表的设计和研究方案,详细介绍了多通道、高采样率、同步采样ADC的数据采集和调理电路单元,以及以高性能浮点DSP芯片TMS320C6745为核心的电网信号数据处理电路单元,提出了基于牛顿插值的动态谐波电能计量的误差校正方法。实验与测试表明,新型三相谐波电能表的基波有功功率相对误差≤0. 1%,基波无功功率相对误差≤1%,2次~21次谐波电压幅值相对误差≤0. 6%、谐波电流幅值相对误差≤0. 7%、谐波相位误差≤0. 5°,符合国家标准GB/T 14549-93中的A类谐波测量仪器相关精度要求。 相似文献
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个人剂量计的校准技术和质量控制 总被引:1,自引:0,他引:1
校准技术和质量控制是保证热释光剂量测量满足各种技术标准要求的重要内容,本文探讨了贯彻实施有关标准,规程时应注意的若干问题。 相似文献
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