Simple memory machine models for GPUs

The main contribution of this paper is to introduce two parallel memory machines, the discrete memory machine (DMM) and the unified memory machine (UMM). Unlike well-studied theoretical parallel computational models such as parallel random access machines, these parallel memory machines are practical and capture the essential feature of the memory access by graphical processing units (GPUs). As a first step of the development of algorithmic techniques on the DMM and the UMM, we first evaluate the computing time for the contiguous access and the stride access to the memory on these models. We then present parallel algorithms to transpose a 2D array on these models and evaluate their performance. Finally, we show that, for any permutation given in offline, data in an array can be moved efficiently along the given permutation both on the DMM and on the UMM. Since the computing time of our permutation algorithms on the DMM and the UMM is equal to the sum of the lower bounds obtained from the memory bandwidth limitation and the latency limitation, they are optimal from the theoretical point of view. We believe that the DMM and the UMM can be good theoretical platforms to develop algorithmic techniques for GPUs.     

计算机风险对金融电子化推进的影响

随着计算机技术的急速发展,其在网络应用上存在着不少的隐患和风险。这对我国银行金融电子化的推进带来重大的影响。因此,本文在分析金融电子化发展的基础上,对计算机风险对我国金融电子化推进造成的问题进行探索,并进一步阐释我国金融电子化推进的对策。     

胜芳地区电网无功现状和补偿方法分析

针对廊坊胜芳地区电网无功功率严重缺乏的现状，在介绍了主网变电站和配电网中采用的无功补偿方法和手段的基础上，分析了该地区电网无功运行中存在的问题，指出了用户变电站和专线用户无功考核缺乏力度、无功补偿电容器损坏后不能及时修复等导致无功缺乏的原因。提出了加装有源滤波器、使用VOC管理变电站和加强无功管理制度建设等措施和建议。     

Accurate phasor measurement for transmission line protection in the presence of shunt capacitor banks

This paper proposes a phasor measurement algorithm for transmission systems compensated with shunt capacitor banks. Since the shunt capacitor banks tend to lower the resonant frequencies, the dominant component, which has the lowest resonant frequency, is insufficiently attenuated by a low-pass filter and has an adverse influence on the phasor measurement of the fundamental component in a fault current signal. This paper theoretically investigates the dominant frequency in the presence of shunt capacitor banks and presents a phasor measurement algorithm immune to the dominant component and DC-offset. The performance of the algorithm is evaluated for a-phase to ground (a–g) faults on a 154-kV transmission system compensated with shunt capacitor banks. The evaluation results indicate that the algorithm can measure the phasor reliably and satisfactorily, although the fault current signal is distorted with the dominant component and DC-offset. The paper concludes by describing the hardware implementation of the algorithm on a prototype unit based on a digital signal processor.     

论国有商业银行内部激励机制的完善

从分析我国国有商业银行内部激励机制的改革实践入手，总结国有商业银行内部激励机制存在的不足，探索有利于发挥国有商业银行经营者和普通员工积极性与创造性的环境及激励因素，并提出若干建议：构建多元化的国有商业银行激励机制；多途径多渠道的创建良好的激励环境。     

国有商业银行的信货风险及规避对策

本文阐述了由于政府管理体制和银行自身决策失误、经营失误等原因使国有商业银行存在较大信贷风险。指出规避国有商业银行的信贷风险,必须理顺产权关系,健全现代企业制度,调整金融管理政策,加强银行内部经营管理。     

农业银行应实行有区域经济特色的金融策略

在我国社会主义市场经济快速发展的新时期,党和国家适时实施一系列区域经济发展战略、决策和部署,先后形成了不同模式的区域特色经济.农业银行作为国有商业银行,应以支持区域经济发展为己任.可实施因地制宜政策,设立有“特区“模式的分支机构;要加强银政合作,实现区域经济可持续发展;要坚持以客户为中心,实行差异化策略,实现效益最大化.     

蒸发或冷凝薄液膜的空间稳定性分析

该文以边界层理论为基础，考虑完整的边界条件，研究了液膜在蒸发，等温和冷凝状态下的线性二维表面波扰动的空间稳定性，对两种不同类型扰动的稳定性进行了理论研究，给出了波数，空间增长率以及波速的变化趋势，分析了雷诺数，倾角，热毛细力以及在蒸发，等温和冷凝三种状态对液膜稳定性的影响。     

抗混叠轮廓波HMT模型的医学图像融合

为了更好地对医学图像进行融合,提出了一种利用抗混叠轮廓波HMT模型的图像融合新算法。该算法首先对原始轮廓波变换的频谱混叠问题展开研究,明确LP分解中的两个低通滤波器不满足Nyquist抽样定律是造成混叠的主要原因。接着,在对低通滤波器考虑带限约束条件下,设计了一种能抑制混叠的利用双通道滤波器组结构的多尺度分解方案,用于代替原始轮廓波变换的LP分解,结合方向滤波器组,实现了一种抗混叠的轮廓波变换。在此基础上,提出一种采用隐马尔可夫树（HMT）来刻划变换系数尺度间相关性的医学图像成像模型,并以期望最大化算法估计模型参数,得到融合图像。CT与MR图像以及MR-T1与MR-T2图像的融合实验表明,该算法的融合结果无论在视觉质量及定量指标上都明显优于基于小波变换和原始轮廓波变换的方法。     

Effect of Adverse Pressure Gradient and Different Vegetated Banks on Flow

This study examines velocity components in 3D and shear stress distributions in flows with adverse pressure gradient over a gravel‐bed channel using three types of vegetation on banks, rice, straw and Typha stems. Results of this experimental study are compared with those for flows in the bare bank channel. Results show that the flows with adverse pressure gradient are not self‐similar in vegetated and bare banks channels. The logarithmic law and parabolic law can be used to well describe flow in the inner and outer regions, respectively, but with different relative flow depths. Shear stress distributions depend on nature of bank roughness and the secondary flow effects because of small values of the aspect ratio and adverse pressure gradient. Quadrant analysis is performed to investigate the effect of different vegetation covers on the Reynolds stress distributions at the central axis of channel and near the vegetated banks. Vegetation covers influence the contributions of different quadrants to the shear stress distribution, showing that sweeps and ejections are dominant events for all vegetated banks for near bed region. However, near the water surface the contributions of outwards and inwards for banks with Typha stems are more important than those for rice and straw. Instead of using a single value for friction factor, for different vegetated banks, a range of friction factor has to be applied in river restoration projects. Vegetated banks result in an increase of more than 60% in friction factor in comparison with that for bare banks under adverse pressure gradient flows. Copyright © 2015 John Wiley & Sons, Ltd.