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The technology for image contrast enhancement is improved evidently since the popularity of consumer electronics in the last decade. Based on Histogram Equalization (HE) method, this paper proposes a simple contrast enhancement scheme named Adaptively Increasing the Value of Histogram (AIVHE). It provides a convenient and effective mechanism to control the rate of contrast enhancement. AIVHE offers...
This paper is concerned with the reliable Hinfin filtering problem against sensor failures for a class of continuous time systems with simultaneous sector-bounded nonlinearities and varying time delay. The resulting design is such that the filtering error system is asymptotically stable and meets the prescribed Hinfin norm constraint in the nominal case as well as in the sensor failure case. A sufficient...
This paper is concerned with the problem of Hinfin filter design for a class of linear uncertain systems with time-varying delay. The uncertainty parameters are supposed to be time-varying, unknown, but bounded, which appear affinely in the matrices of system model. Our proposed robust Hinfin filter is a switching-type filter, in which the filter parameters are tuned in a switching manner via a switching...
The non-fragile dynamic output feedback Hinfin controller design problem affected by finite word length (FWL) for linear discrete-time systems is investigated. The controller to be designed is assumed to be with additive gain variations, which reflect the FWL effects in controller implementation. A notion of structured vertex separator is proposed to approach this problem, and exploited to develop...
The problems of Hinfin stability and stabilization for networked control systems (NCSs) with state and control signal quantizations are considered, and a new sector bound approach is proposed. Unlike the previous works, the transform of system models to uncertain systems is not needed, which results in that the proposed controller design method is simpler. Even for the NCSs with only state quantizations,...
The strategy of exempting bus from other traffic through exclusive bus lanes (XBL) is prevalent. Rather than just deploying the XBL system, in this study, a new innovative dynamic bus lane (DBL) operation system which is expected to be more productive is initially introduced. Unlike conventional studies which are mainly focused on operational performance of buses, this study attempts to examine the...
This paper establishes the equivalence among several stability criteria, and presents a simplified stability criterion for singular time-delay systems. Furthermore, by using a delay decomposition method, a new stability criterion which is much less conservative than the existing ones is obtained. A numerical example is given to illustrate the effectiveness and less conservatism of the new proposed...
The problem of non-fragile Hinfin filtering for a class of linear systems described by delta operator with circular region pole constraints is investigated. The purpose of the paper is to design a filter such that the error filtering system not only satisfies the prescribed circular pole constraints or D-stability constraint, but also meets the prescribed Hinfin norm constraint on the transfer function...
This paper studies the problem of Hinfin output tracking control for continuous-time networked control systems (NCSs) with communication constraints. By using the continuous Jensen inequality, linear matrix inequality (LMI)-based Hinfin output tracking controller design for nominal NCSs with controller-to-actuator communication constraints is presented, and a new method is proposed to design Hinfin...
This paper addresses the problem of fault detection (FD) in low frequency domain for linear discrete-time delay systems. It is shown that FD problem in low frequency range can be formulated as looking for an Hinfin fault detection filter (FDF) and the proposed filter design conditions are given in terms of linear matrix inequalities (LMIs). Finally, a numerical example demonstrates the effectiveness...
This paper studies the model reduction problem for linear continuous-time systems over finite frequency interval. Different form the existing methods in the literature, we resort the problem to the aid of recently developed Generalized Kalman-Yakubovich-Popov (GKYP) lemma. A finite frequency Hinfin model reduction design method is presented in terms of solutions to a set of linear matrix inequalities...
This paper studies the problem of Hinfin output tracking control for discrete-time networked control systems (NCSs) with and without parameter uncertainty. By defining new Lyapunov function and using the discrete Jensen inequality, linear matrix inequality (LMI)-based Hinfin output tracking performance analysis and controller design are presented, and the merit of the proposed methods lies in their...
The paper deals with the reliable Hinfin filtering problem for linear uncertain continuous-time systems with bounded disturbances. Different from the existing approaches, the filter is designed in certain finite frequency ranges, which is important in practice, since the full frequency approaches are conservative to some extent for the case when the frequency ranges of disturbances are known beforehand...
The technologies for image contrast enhancement are improved evidently since the popularity of consumer electronics and image processing in the last decade. Based on histogram equalization (HE), this paper proposes a simple contrast enhancement scheme named adaptively increasing the value of histogram (AIVHE). It provides a convenient and effective mechanism to control the rate of contrast enhancement...
The article analyzes the web page, multimedia and database technologies basing on giving a minute description of four modules of the network course of database principle: course learning, exercise and test, teaching assistant and system management. Finally, it sums up the characteristics and applications of the network courses.
Physical efficiency identification and quantization of power transmission and transformation is the importance to economic evaluation and post-evaluation for projects of benefit analysis. According to kinds of project features and its position and action in the network, this paper has identified correlative physics efficiency separately. According to the main physical efficiency index of different...
In recent years, many studies have shown that microarray gene expression data is useful for disease identification and cancer classification. However, since gene expression data may contain thousands of genes simultaneously, successful microarray classification can be rather difficult. Feature (gene) selection is a frequently used pre-processing technology for successful classification of microarray...
Many previous research papers have demonstrated that microarray gene expression data are useful for disease classification and medical diagnosis. Cancer microarray data normally have a particular characteristic where features (genes) greatly exceed the instance (tissue sample) numbers. Selecting appropriate numbers and relevant features to differentiate different types of cancer remains a challenge...
We study the computation of the H∞ optimal weighted pure sensitivity for a class of infinite dimensional systems by characterizing certain wandering sub-spaces of a related Kre??n space. The new characterization can be used to obtain explicit bases for the wandering sub-space. Explicit formulas for the optimal sensitivity can be obtained from these bases. The new characterization can also be used...
We consider H∞-optimal mixed sensitivity design for idle speed control of an automobile engine model [13]. This model is a three-input four-output system containing two incommensurate time delays. We show how to explicitly compute the optimal performance and optimal compensators.
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