基于遗传算法的PID参数整定与优化

PID参数整定与优化一直是自动控制领域研究的重要问题。采用遗传算法进行PID参数整定与优化是一种寻求全局最优且与初始条件无关的优化方法。在参数整定与优化过程中,考虑了过程控制系统的参数整定特点和寻优精度。     

倒谱距离和短时能量的语音端点检测方法研究

在讨论传统倒谱距离语音端点检测方法不足的基础上,提出了一种基于倒谱距离和短时能量的语音端点检测改进方法。基于倒谱距离的单参数端点检测方法在高信噪比环境下效果较好,然而在低信噪比的环境下其端点检测性能急剧下降。通过分析倒谱距离和短时能量各自的端点检测特性,建立了一种结合二者特点的双参数判决准则,在保证运算量没有显著增大的前提下提高了端点检测的准确率。仿真实验结果表明,新方法相对于基本倒谱距离端点检测方法,在低信噪比的高斯白噪声环境下端点检测性能有较明显提高。     

聚碳硅烷熔融纺丝的动力学模拟

对聚碳硅烷(PCS)熔融纺丝进行动力学模拟，得到了其丝条参数随纺程的变化关系，找出其玻璃化温度，对其纺丝过程的控制有着重要的指导意义。     

《影子乐园——调整图形》教学设计

教材分析《影子乐园》这一课的知识点是苏教版小学信息技术教材第12课《调整图形》的内容。本课要求学生能够掌握对图形进行＂翻转/旋转＂以及＂拉伸/扭曲＂的方法。学情分析三年级的学生学习信息技术已有一个学期,通过以往的学习,学生对画图软件的基本功能有了一定掌握,对画图软件也有一定的兴趣。＂翻转/旋转＂以及＂拉升/扭曲＂相对于之前学过的画图软件中工具的教学来说有一定难度。因此,这节课只要让学生基本学会恰当地使用这两个命令即可。教学目标知识与技能目标：认识＂图像＂菜单中的＂翻转/旋转＂命令、＂拉伸/扭曲＂以及“拉升／扭曲”相对于之前学过的画图软件中工具的放学来说有一定难度。因此,这节课只要让学生基本学会恰当地使用这两个命令即可。     

Local adaptive segmentation algorithm for 3-D medical image based on robust feature statistics

Medical image segmentation is of pivotal importance in computer-aided clinical diagnosis. Many factors, including noises, bias field effect, local volume effect, as well as tissue movement may affect the med- ical image, thus causing blurring or uneven characteristics when forming a picture. Such quality defects will inevitably impair the gray-scale difference between adjacent tissues and lead to insufficient segmentation or even leakage during tissue or organ segmentation. In the present investigation, a local adaptive segmentation algorithm for 3-D medical image based on robust feature statistics （LARFS） was proposed. By combining segmentation algorithm principles for traditional region growing （RG） and robust feature statistics （RFS）, the location and neighborhood image information of input seed point can be comprehensively analyzed by LARFS. Results show that, for different segmentation objects, under controlling the input parameter of growing factor within certain range, LARFS segmentation algorithm can adapt well to the regional geometric shape. And be- cause the robust feature statistics is applied in the contour evolution process, LARFS algorithm is not sensitive to noises and not easily influenced by image contrast and object topology. Hence, the leakage and excessive segmentation effects are ameliorated with a smooth edge, and the accuracy can be controlled within the effective error range.     

Performance analysis for range expansion in heterogeneous networks

In this paper, the uplink and downlink performance of a two-tier heterogeneous network （HetNet） with range expansion （RE） is analyzed. Different from previous works, base stations （BSs） are modeled as a spatial Poisson point process. This model can not only capture the irregularity of the BS deployment but also lead to closed form expressions. With the analytical results, the impacts of several key parameters on the coverage and throughput performance are investigated. Our results justifies the effectiveness of RE and Pico deployment. Based on our analyses, certain attention should be made on the RE design to balance the uplink and downlink performance. Our analyses are corroborated by simulations and can thus serve as a flexible and quick guidance for system design without complicated and time-consuming system-level platform construction and simulation.     

交流电量采集技术在LF炉的应用

介绍交流电量采集系统的设计,及其在LF精炼炉中的应用.     

国内陶瓷市场出现六大变化

1产业结构调整取得重大进展 加入WTO以来，我国陶瓷工业以结构调整为主线，使组织结构、产品结构、资本结构、行业结构等都发生了深刻变化。组织结构变大通过以产权为纽带，以名牌产品为龙头，网罗、兼并、吸收资本，组建企业集团，调整组织结构，使企业得到不断壮大，朝着大而强方向发展，像新中源就是很好的典型。此外，通过“三改一加强”，许多企业内部组织机构实现了与市场对接，企业内部人力资源结构也得到了不断优化。     

环氧乙烯基酯树脂 (Ⅲ)环氧乙烯基酯树脂在有机溶剂中的稳定性

对环氧乙烯基酯树脂在有机溶剂中的稳定性作了理论上的探讨,并提供了3种环氧乙烯基酯树脂的溶解度参数实验数据。     

DCF法在石化项目估值中的应用

阐述了石化项目价值评估的方法和步骤。