Robust fault detection using Luenberger-type unknown input observers-a parametric approach

A new parametric observer-based approach for robust fault detection in multivariable linear systems with unknown disturbances is proposed. The residual is generated through utilizing a Luenberger function observer. By using a parametric solution to a class of generalized Sylvester matrix equations, a parametrization is proposed for the residual generator on the basis of a Luenberger function observer. By further properly constraining the design parameters provided in the Luenberger observer design, the effect of the unknown disturbance is decoupled from the residual signal. The proposed approach provides all the degrees of freedom and is demonstrated to be simple and effective.     

Mixed time- and frequency-domain robust eigenstructure assignment

This paper considers robust eigenstructure assignment for multivariable systems. The time-domain performance specifications provided by eigenstructure assignment and robust performance specifications in the frequency domain considered by H infinity control are combined to realize joint optimal robust control design. A parametric expression for state-feedback eigenstructure assignment is introduced on the basis of a set of free parameters. The mixed performance index used as the cost function consists of two parts: robustness in the frequency domain; and system eigenstructure constraints in the time domain. The analytical gradient calculation of the cost function with respect to the free parameters is derived for optimal robust eigenstructure assignment using gradientbased optimization. The mixed time- and frequency-domain robust eigenstructure assignment is demonstrated in the design of a mode-decoupled roll-yaw autopilot.     

Finite iterative algorithm for solving coupled Lyapunov equations appearing in continuous-time Markov jump linear systems

An iterative algorithm for solving coupled algebraic Lyapunov equations appearing in continuous-time linear systems with Markovian transitions is established. The algorithm is computationally efficient since it can obtain the solution within finite steps in the absence of round-off errors.     

Absorption and scattering properties of water body in Taihu Lake,China: backscattering

The HydroScat‐6 spectral backscattering sensor was used to measure in situ the backscattering coefficients at six wavelengths (442, 488, 532, 589, 676, 852 nm) at 67 samples from all over Taihu Lake, China. The measured raw data were corrected with the tested backscattering probabilities of 0.015, 0.019, 0.030 and 0.050. Combined with simulated data by the optimization algorithm, it shows that the backscattering probability (a ratio between backscattering coefficient and scattering coefficient of suspended particulate matter), with a mean of 0.041 (SD 0.030), is wavelength‐dependent and not a constant, and may be expressed as a significant quadratic function of wavelength. The value of backscattering probability can be used to perform the sigma correction for the measured raw data more accurately. Thus, the backscattering may be uncovered as clearly and precisely as possible.     

A new viewpoint of H ∞ control in frequency domain

In this paper, a new viewpoint of H X control in frequency domain is presented. From this viewpoint, the robust performance problem is reconsidered. A numerical example is given to show the efficiency of the result.     

高速环形FIFO的设计

针对全局异步局部同步系统中不同时钟域间的通信问题,提出一种可用于多核片上系统的环形FIFO.采用独特的运行协议和串并结合的数据传输方式以及保证通信质量的双轨编码方法,设计了一种新颖的FIFO体系结构,使其可支持不同宽度数据的发送和接收,保证数据的完整高速传输.在0.18μm标准CMOS工艺下,FIFO的传输延时为681...     

Lab-on-a-chip: a component view

Miniaturization is being increasingly applied to biological and chemical analysis processes. Lab-on-a-chip systems are direct creation of the advancement in the miniaturization of these processes. They offer a host of exciting applications in several areas including clinical diagnostics, food and environmental analysis, and drug discovery and delivery studies. This paper reviews lab-on-a-chip systems from their components perspective. It provides a categorization of the standard functional components found in lab-on-a-chip devices together with an overview of the latest trends and developments related to lab-on-a-chip technologies and their application in nanobiotechnology. The functional components include: injector, transporter, preparator, mixer, reactor, separator, detector, controller, and power supply. The components are represented by appropriate symbols allowing designers to present their lab-on-a-chip products in a standard manner. Definition and role of each functional component are included and complemented with examples of existing work. Through the approach presented in this paper, it is hoped that modularity and technology transfer in lab-on-a-chip systems can be further facilitated and their application in nanobiotechnology be expanded     

浅谈当代教育的基本特点

教育是培养人、造就人的一种社会活动,它既要体现社会的要求,反映人的身心发展的规律,又要富于创造精神.通过教育活动的实施,受教育者不仅要掌握人类在过去的实践中所获得的理论知识、实际技能以及形成一般社会所要求的思想品德,而且要形成开拓、创新、不囿于成见的个性心理和内在品质,这也是教育的终极目的和最高境界.