基于基元重启的OpenGL和CUDA图形渲染算法探索

针对OpenGL渲染图形要多次访问缓存区的问题,提出一种OpenGL和CUDA混合编程的图形渲染算法来加速Perlin Kernel生成虚拟地形图。首先,通过OpenGL将缓存映射到CUDA内存空间,利用CUDA完成加速计算任务; 然后,为几何图形设置开始和结束的位置标志,使用基元重启对图形进行组合; 最后,对缓冲区对象进行渲染。实验结果表明,改进后的基于基元重启的混合算法在GTX 650 GPU上的平均帧速率为960fps,帧速率提高6%,算法改进后渲染方法的执行效率提高了63倍。实验证实基元重启可以提高3D处理性能。     

《单端金属卤化物灯用LC顶峰超前式镇流器性能要求》中主要参数的测试方法

金卤灯因其独特的优点,在目前乃至较远的将来,仍旧是推广高效节能绿色照明的主力产品。美标钪钠系列的(非脉冲启动)金卤灯,按设计要求应配备LC顶峰超前式镇流器。本文介绍了该种镇流器的特点、优点以及各项特性指标考核的目的、意义和检测方法。     

The black smoke control in a chain‐grate stoker‐fired boiler at the time of ignition and restart of the combustion

The black smoke is always emitted from the chimney in the chain‐grate stoker‐fired boiler at the time of ignition at ambient temperature and restart of the combustion after temporary flameout in China. The purpose of the work is to reduce the black smoke emission. A laboratory fixed‐grate model has been used to simulate the combustion of coal in chain‐grate stoker‐fired boiler. The CO and O₂ concentration in the flue gas have been measured with a flue gas analyser, and the black smoke emitted from the chimney has been screened with Charge Couple Device (CCD) video camera. Power 2^# coal, sized at 5–25 mm, has been fired in the fixed‐grate model. The secondary air has been used to enhance the turbulence in the furnace after the numerical simulation. The results of experiments show that the emission of the black smoke at the time of ignition of the coal at ambient temperature is more serious than that of restart of the combustion after the temporary flameout for the case of the temperature; the secondary air is helpful for reducing the black smoke emission for enhancing the intensity of the turbulence in the furnace; selection of coal particle size is necessary, the smaller the size of the coal is, the more serious the black smoke emission is, and the effect of reducing the black smoke emission with the secondary air is more evident with smaller‐size coal. The industrial test has been employed to study the effect of the air demand. It indicates that rational stoichiometric air/fuel ratio is helpful for reducing the black smoke emission in the restart of the combustion after the temporary flameout. Copyright © 2006 John Wiley & Sons, Ltd.     

可拆卸式熔锌感应电炉的运行实践

叙述了可拆卸式熔锌感应电炉的运行实践，总结了电炉开炉、日常维护、冷炉再启动等实践经验。     

A multi-agent system for the decentralized resource-constrained multi-project scheduling problem

A restart evolution strategy (RES) for the resource‐constrained project scheduling problem (RCPSP), as well as its integration in a multi‐agent system (MAS) for solving the decentralized resource‐constrained multi‐project scheduling problem (DRCMPSP) will be presented. To evaluate the developed approach, problem instances of the RCPSP taken from the literature with up to 300 activities are used, as well as 80 generated instances of the DRCMPSP, with up to 20 projects and with up to 120 activities each. For 73 instances of the RCPSP, the RES found better solutions than the best ones found so far. In addition, the MAS is suitable for solving large multi‐project instances decentrally. The results for the DRCMPSP instances show that the presented decentralized MAS is competitive with a central solution approach.     

“晃电”再启动技术在石油化工企业中的运用

近年来,化工企业生产对动力系统的持续性提出了更高的要求,电动机抗晃电技术也愈加重要.为优化高压电动机抗晃电自启动方案,以一种新型微机型综合保护器为例,结合生产实际提出了晃电后电动机自启动逻辑,详细阐述了实现过程和相关保护设定原则,满足了现代工企业连续生产的需要.     

Improved butterfly optimisation algorithm based on guiding weight and population restart

ABSTRACT

Butterfly Optimisation Algorithm (BOA) is a kind of meta-heuristic swarm intelligence algorithm based on butterfly foraging strategy, but it still needs to be improved in the aspects of convergence speed and accuracy when solving with high-dimensional optimisation problems. In this paper, an improved butterfly optimisation algorithm is proposed, in which guiding weight and population restart strategy are applied to the original algorithm. By adding guiding weight to the global search equation, the convergence speed and accuracy of the algorithm are improved, and the possibility of jumping out of the local optimal solution is increased by the population restart strategy. In order to verify the performance of the proposed algorithm, 24 benchmark functions commonly used for optimisation algorithm experiments are applied in this paper, including 12 unimodal functions and 12 multimodal functions. Experimental results show that the proposed algorithm improves the convergence speed, accuracy and the ability to jump out of the local optimal solution.     

基于POD的埋地热油管道停输再启动模拟高效算法

基于特征正交分解(POD)技术,开发了一种进行埋地热油管道正常输送、停输及再启动3个过程计算的高效算法。首先采用有限差分法和有限容积法建立基础样本,然后通过奇异值分解（SVD）算法得到管道停输后的沿线油温、土壤温度场和再启动流量基函数库,并插值得到任意计算参数条件下的谱系数,最后进行重构。该算法可在少量计算条件数值模拟的基础上,快速、准确地求解其他条件下停输再启动过程的相关参数。实际算例表明,POD模拟结果与直接数值解法相比,温度偏差在0.05℃以内,流量偏差小于3%。POD算法计算速度显著提高,单算例平均耗时小于0.1 s,而数值算法单算例平均耗时约20min。     

异步电动机无速度传感器再起动方法的研究

介绍一种无速度传感器异步电动机拖动系统的再起动方法。它是基于异步电动机在某角频率下发生谐振的阻抗特性来实现的 ,根据振荡时α ,β交直两轴的电流或磁通信息 ,来检测回转速度。无须高速运算 ,并能够利用低成本的处理器来完成。这种方法的有效性已通过对5 5kW的异步电动机实验和仿真的结果加以证实     

嵌套的计算系统进程级自适应抗衰重启策略研究及模型分析

执行细粒度的进程级软件抗衰可以进一步降低抗衰成本，提高软件可靠性。本文针对软件系统中进程间交互频繁多变且交互关系难以判定的特点，分析进程间控制、调用及数据访问的关系，重新定义了进程重启相关度，提出了自适应进程相关拓扑图的算法理论，从而制定了嵌套的进程级软件抗衰重启策略，并在此基础上构建了策略实施模型，从而为全面实现智能化的软件系统细粒度软件抗衰提供了支持。