Evaluating the impact of reissued instructions on data speculative processor performance

In this paper, we investigate the impact of instructions reissued due to misspeculated data dependences on processor performance. Recently, the practice of speculation in resolving data dependences has been studied as a means of extracting more instruction level parallelism. When a misspeculation occurs, it is necessary to revert the processor state to a safe point where the speculation is initiated, with an instruction reissue mechanism utilized for that purpose. The instruction reissue suffers less miss penalties than instruction squashing which handles misspeculated control flows in current generation processors, but causes redundant instruction dispatching, i.e. multiple copies of an instruction are in flight in functional units. The effectiveness of data speculation would be diminished, if reissued instructions caused serious structural hazards. Therefore, we evaluate how the instruction reissue affects processor performance using an execution-driven simulator. We find that overhead due to instruction reissue is sufficiently small so as to allow data speculation to contribute to processor performance.     

基于模糊修正的金融预测

文章研究了模糊逻辑模型在金融预测领域中的应用。由于该模型自身的局限性,在对金融时间序列趋势的连续预测应用中,趋势准确率偏低,连续预测值波动小(体现不出未来的市场走向),对此,提出了模糊修正的方法。文章运用模糊修正模型对上证综合指数和道琼斯平均工业指数做试验,并与BP神经网络进行比较,试验结果表明,运用模糊修正模型进行金融预测是可行的和有效的。     

干涉图去包裹位相的二次校正

相位去包裹是移相干涉技术中关键的组成部分。一些去包裹算法在处理具有较多无效成像点的干涉图时，会在处理结果中引入较大的算法误差。提出了通过对去包裹位相进行二次校正的方法，实现去包裹位相算法误差的有效消除。文中通过基于DCT变换的最小二乘去包裹算法为例进行了说明，并通过一光学平晶表面的处理结果对方法进行了验证。     

煤矿生产中资源管理工作存在问题及改进对策

对平煤一矿煤炭资源开发中存在的资源浪费与遭受破坏的现状,提出了优化设计,强化管理,合理开采,减少损失的若干对策。     

人体关节图象的轮廓修正算法研究

针对人体关节图象的特点,对图象轮廓的修正算法进行了研究,提出了在轮廓识别完后,采用自动与手动修正轮廓的方法对轮廓进行修正,使人体关节图象的处理具有高的准确性。     

关联文本分类的规则修正策略

通过分析基于关联规则的文本分类,发现在保持分类规则对正例样本正确分类的同时减少对反例样本的错误分类可以提高分类的精确度.基于否定选择算法的思想提出了分类规则修正策略,用反例样本集合对分类规则进行耐受,从分类规则错误判别的反例样本中再产生规则,与原来的规则组成新规则,称为增强关联规则.基于修正策略产生的增强关联规则可以大幅度地减少对反例样本的错误分类,从而提高分类的精确度.通过形式化证明和实验,分类规则修正策略的有效性得到验证.     

应用网络规划法实现大系统的短期经济调度

本文以网络规划法为基础，构造了火电系统有功经济调度的网流模型，提出一种新的求解方法，该算法简单、快速、可靠、无收敛性问题，因而具有广泛的适用性，本文还提出了可行性修正变量的概念，对理想的有功功率经济分布作以可行性修从而使有功调度方案更可行，合理。     

Out-of-order durable event processing in integrated wireless networks

Many events in real world applications are long-lasting events which have certain durations. The temporal relationships among those durable events are often complex. Processing such complex events has become increasingly important in applications of wireless networks. An important issue of complex event processing is to extract patterns from event streams to support decision making in real-time. However, network latencies and machine failures in wireless networks may cause events to be out-of-order. In this work, we analyze the preliminaries of event temporal semantics. A tree-plan model of out-of-order durable events is proposed. A hybrid solution is correspondingly introduced. Extensive experimental studies demonstrate the efficiency of our approach.     

视图相关问题研究及修订建议

研究了 GB/T 17451—1998视图定义、分类等相关问题;指出了视图定义,还存在不够严谨、不够明确、不够顺畅;提出了投影面体系分类法、投射方向分类法和物体分类法的视图三要素分类法;阐明了视图分类中存在视图名称交叉现象;并对视图相关条款提出了修订建议.     

输变电设备风险评估模型的简化修正与应用实践

在分析输变电设备风险评估导则模型基础上,引入变电站的地位、接线方式等因素,确定变电站风险程度。采用定量与定性结合的分析方法,对风险评估的模型及参量进行修正,在运行参数不完整的情况下,应用于输变电主设备的风险评估,达到合理评价风险等级和指导状态检修策略选择与制定的目的,实践取得一定的应用效果。