Nonsynchronized state estimation of uncertain discrete-time piecewise affine systems

This paper investigates the problem of robust H-infinity state estimation for a class of uncertain discretetime piecewise affine systems where state space instead of measurable output space partitions are assumed so that the filter implementation may not be synchronized with plant state trajectory transitions. Based on a piecewise quadratic Lyapunov function combined with S-procedure and some matrix inequality convexifying techniques, two different approaches are developed to the robust filtering design for the underlying piecewise affine systems. It is shown that the filter gains can be obtained by solving a set of linear matrix inequalities (LMIs). Finally, a simulation example is provided to illustrate the effectiveness of the proposed approaches.     

音体美专业学生计算机教学策略研究

音体美专业学生的计算机课程教学,是困扰教师教学的难题。本文通过对该类专业学生教学过程和实验设计的探讨,从多个角度介绍解决这些困扰的方法和策略,试图运用这些手段,克服教学中的困难和阻碍,以达到较理想的教学目标。     

景观设计中生态文化理论的实践运用

城市化快速发展使城市空间日益扩张,与此同时生态系统也遭受着严重破坏,这就要求在景观设计中去关注生态关系,合理利用生态文化,为可持续发展创造有利的条件。在景观设计理论研究中对于造园艺术、建筑设计、城市规划等问题的认识上,提倡生态学的思想与观点,构建新型的生态文化设计理念,将是我们科学地认识和处理人地关系的全新课题。如何把这一理念运用到景观设计中去寻求自身的平衡,这将是人们对自然认识的进步,也是人类对自身认识的进步。     

移动可伸缩三维倒立摆模型的双足机器人步态控制策略

双足机器人的步态控制策略是保证双足稳定行走的重要条件之一.结合人在行走时ZMP平稳移动的特性,建立了一种移动可伸缩三维倒立摆模型;在约束平面内分析ZMP与COG的运动关系,将ZMP和COG分别定为快变因子和慢变因子,提出了移动可伸缩三维倒立摆模型的双足机器人步态控制策略;最后通过Matlab/ADAMS进行了步态控制仿真研究.仿真结果表明双足机器人可以稳定地行走,验证了该步态控制策略的可行性.     

Cancellation of bulging effect on mould level in continuous casting: Experimental validation

During the continuous casting of steel, several disturbances occur and affect all the parts of the caster, including the mould where the molten steel has to be stable for good quality of the final product. Especially at high casting velocities, the bulging generates important level fluctuations which cannot be efficiently rejected by the classical controllers. To address these problems, this paper proposes an architecture combining disturbances estimation and compensation techniques. It operates as an additional module and does not need any change of the main controller currently implemented. The entire structure has been tested successfully through several simulations and by means of intensive water model experiments.     

Dynamic traffic prediction for insufficient data roadways via automatic control theories

This study aims to propose an algorithm for traffic estimation, particularly for urban roadway sections with insufficient data sources. Establishing an advanced traffic management system (ATMS) heavily depends on obtaining complete data. In this regard, traffic detectors play an important role in data acquisition. However, installing traffic detectors extensively over a metropolitan area can be rather expensive. As such, in most cities around the world, vehicle detectors for traffic data collection are relatively insufficient to meet requirements. In light of this, the current research therefore proposes a feasible algorithm of dynamic section flow prediction based on the automatic control theory and observer design for roadway sections with insufficient data sources. According to the numerical evaluation, the method is found to be satisfactory and acceptable in practice.     

Model predictive control of a rotary cement kiln

A first principles model of a cement kiln is used to control and optimize the burning of clinker in the cement production process. The model considers heat transfer between a gas and a feed state via convection and radiation. Furthermore, it contains effects such as chemical reactions, feed transport, energy losses and energy input. A model predictive controller is used to stabilize a temperature profile along the rotary kiln, guarantee good combustion conditions and maximize production. Moving horizon estimation was used for online estimation of selected model parameters and unmeasured states. Results from the pilot site are presented.     

一种基于图像块的Legendre矩高精度快速算法

针对图像的Legendre正交矩计算量大和矩值求解过程中存在离散近似误差等问题,提出一种新的高精度快速计算图像Legendre矩方法.文中首先提出一种最大块优先分块策略,然后在此基础上,根据图像像素灰度值的取值特征将图像进行分块表示,以每个图像块为单位计算图像的Legendre矩.实验结果表明,与现有的快速算法相比,文中方法在保证矩值高精确的前提下,有效地减少了算术运算的次数,降低了计算复杂度,具有较快的计算速度.     

一种AVS-M整数像素运动估计快速算法

根据AVS-M编码过程中运动估计的特点,在整数像素运动矢量搜索过程中,提出一种基于起点预测和早停止的自适应运动估计快速搜索算法.与MVFAST算法相比,大大减少了搜索点数,加速了搜索过程,平均速度提高了39.9%~45.7%,减少了整数像素运动估计的计算量,在保持较低的编码码率和较好的图像质量的同时,提高了编码速度.     

一种基于自适应扁平搜索模板的改进ARPS算法

针对ARPS算法中初始预测运动矢量不够精确并且ARPS算法针对不同宏块采用相同搜索策略的问题,在深入研究ARPS算法原理的基础上,提出一种基于自适应扁平搜索模板的新的快速运动估计算法.本文在算法的初始预测运动矢量、算法提前终止准则等方面提出了新的观点和方法,同时针对物体的不同运动趋势采用不同的搜索模板.实验证明,本文提出的改进算法在不影响图像编码效率的前提下较大地降低了计算复杂度.