Web数据库性能调优(英文)

提出了一种基于Web数据库系统设计、实现和性能调优的新方法,该方法包括由RDBMS配置优化、应用模式设计优化和编程优化。通过内存、分段、磁盘参数和时间相关参数的优化可以设置一个好的RDBMS运行环境。在编程时,通过减少与后台连接和断开操作、建立和使用索引、多用存储过程和优化SQL语句可以优化系统性能。在应用设计时,通过优化应用逻辑和降低规范化可以大大地改善系统性能。     

英语RC挂靠偏向的眼动实验研究

RC挂靠现象研究对揭示歧义句加工内部心理过程具有重要意义,现有的修饰语挂靠若干假说是否适用中国英语学习者值得深入探索。本研究通过Tobii T-120型眼动仪,随机抽取49名英语专业本科生进行歧义句加工眼动实验。研究显示,RC关系从句呈现NP1挂靠偏向,支持语言调整假说。     

仿人智能控制器的模糊自整定

仿人智能控制器（ＨＳＩＣ）是一类实时鲁棒的智能控制器，被成功用于不少工业过程，但在实际应用中，控制器参数的整定仍然依靠专家来进行，考虑到ＨＳＩＣ控制器参数与系统闭环响应过程特征参数之间的模糊关系，本文提出了一类基于模糊推理的参数自整定方法并用于温度对象的控制中，表明该方法是有效的。     

Genetic algorithms for numerical optimization

Genetic algorithms (GAs) are stochastic adaptive algorithms whose search method is based on simulation of natural genetic inheritance and Darwinian striving for survival. They can be used to find approximate solutions to numerical optimization problems in cases where finding the exact optimum is prohibitively expensive, or where no algorithm is known. However, such applications can encounter problems that sometimes delay, if not prevent, finding the optimal solutions with desired precision. In this paper we describe applications of GAs to numerical optimization, present three novel ways to handle such problems, and give some experimental results.     

Sequential tuning of complex computer models

We propose a method that uses a sequential design instead of a space filling design for estimating tuning parameters of a complex computer model. The goal is to bring the computer model output closer to the real system output. The method fits separate Gaussian process (GP) models to the available data from the physical experiment and the computer experiment and minimizes the discrepancy between the predictions from the GP models to obtain estimates of the tuning parameters. A criterion based on the discrepancy between the predictions from the two GP models and the standard error of prediction for the computer experiment output is then used to obtain a design point for the next run of the computer experiment. The tuning parameters are re-estimated using the augmented data set. The steps are repeated until the budget for the computer experiment data is exhausted. Simulation studies show that the proposed method performs better in bringing a computer model closer to the real system than methods that use a space filling design.     

CRTSⅡ型无砟轨道板精调设站和搭接方式创新技术

通过对高速铁路CRTSⅡ型无砟轨道板精调设站和搭接方式的创新,测量设站更加灵活机动,操作方便,既保证了设站位置和定向点的绝对精度,又顾及了不同设站位置之间的相对精度,消除了轨道对接处的微量错动,实现了轨道的平顺、无缝搭接。     

教育与社会互动的机理释义及其调谐

从教育与社会互动的机理看,教育的社会功能具有正负两个方面的效应,故应对之加以调谐,才能更好地促进教育与社会和谐互动。而教育和社会的主体是人,两者互动的中介也是人,两者的互动域是人的生活世界,两者发展的最终目标都在于满足人的生活需要和促进人的全面自由的发展。因此,生活教育模式可以作为教育与社会互动的调谐器。     

基于极限环法的PID快速自整定的一种实现

探讨了基于极限环法的ＰＩＤ在线快速自整定理论和实现问题,提出采用满足度－零度继电特性生成极限环,并应用自振荡自适应理论和离散Ｆｏｕｒｉｅｒ级数变换滤波算法进行临界参数估计,还引入自适应预调点概念处理自整定的安全性问题。