摘要：Limited main memory bandwidth is becoming a fundamental performance bottleneck in chipmultiprocessor （CMP） design. Yet directly increasing the peak memory bandwidth can incur high cost and power consumption. In this paper, we address this problem by proposing a memory, a bandwidth-aware reconfigurable cache hierarchy, BACH, with hybrid memory technologies. Components of our BACH design include a hybrid cache hierarchy, a reconfiguration mechanism, and a statistical prediction engine. Our hybrid cache hierarchy chooses different memory technologies with various bandwidth characteristics, such as spin-transfer torque memory （STT-MRAM）, resistive memory （ReRAM）, and embedded DRAM （eDRAM）, to configure each level so that the peak bandwidth of the overall cache hierarchy is optimized. Our reconfiguration mechanism can dynamically adjust the cache capacity of each level based on the predicted bandwidth demands of running workloads. The bandwidth prediction is performed by our prediction engine. We evaluate the system performance gain obtained by BACH design with a set of multithreaded and multiprogrammed workloads with and without the limitation of system power budget. Compared with traditional SRAM-based cache design, BACH improves the system throughput by 58% and 14% with multithreaded and multiprogrammed workloads respectively.

摘要：相连商城的地铁车站火灾危险性大,客流多。这两者之间的连接通道是火灾烟气在地下空间跨区域传播的主要途径。空气幕系统在工业生产中较常使用,本文拟采用智能空气幕系统来控制烟气在区域间的跨境传播,设计了根据环境来控制送风速度,利用理论分析得到阻止烟气向前迁移的临界速度,并利用fluent软件构建二维流动模型,通过多工况的对比,得出最佳的送风角度。

摘要：利用正交频分复用技术(OFDM)作为煤矿井下中压电力桥集器的核心技术,并相应提出了一种基于实数值遗传算法的改进部分传输序列(PTS)算法和基于SC算法的定时同步改进算法来加强通信的实时性与准确性,对中压电力桥集器的硬件系统的实现做了初步设计。经仿真结果证明,同其他优化算法相比,收敛速度更快,定时估计精度更高,系统性能得到明显的改善。

摘要：针对经典的矢量控制系统中磁链观测器的参数偏差影响系统稳态性能和动态性能的不足,提出了把自适应控制融合到矢量控制当中的策略,设计了转子磁链自适应观测器,得出了异步电动机的转子磁链自适应观测器的算法,构成转速与磁链闭环的矢量控制系统。仿真结果表明,该系统具有一定的鲁棒性和较好的稳、动态性能。