Exact or approximate solutions to constrained linear model predictive control (MPC) problems can be pre-computed otT-line in an explicit form as a piecewise linear state feedback defined on a polyhedral partition of t...
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Traditional optimal thresholding methods are very computationally expensive when extended to multilevel thresholding for their exhaustively search mode. So their applications are limited. In this paper, a relative ent...
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ISBN:
(纸本)0780377028
Traditional optimal thresholding methods are very computationally expensive when extended to multilevel thresholding for their exhaustively search mode. So their applications are limited. In this paper, a relative entropy multilevel thresholding method based on genetic algorithm (RE-GA) is developed. The proposed method makes use of GA's properties such as high efficiency, rapid convergence and global optimization. The relative entropy is treated as the fitness function. Applying the proposed method to process image, the computation speed is accelerated and the quality is improved. Simulation results verify the performance of the proposed method by comparison with the traditional optimal thresholding methods.
During the course of conventional multiscale morphological filtering, when the noise is filtered, the signals which are smaller than the structuring elements (SE) may be also removed. In this paper, a novel edge prese...
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ISBN:
(纸本)0780378652
During the course of conventional multiscale morphological filtering, when the noise is filtered, the signals which are smaller than the structuring elements (SE) may be also removed. In this paper, a novel edge preserving multiscale filtering (EPMF) method based on mathematical morphology is proposed. The EPMF method adds the multiscale top-hat transformation and bottom-hat transformation to the conventional multiscale morphological opening and closing filtering. The two added transformations are used to extract and smooth the features which are smaller than the current scale. It is also found that the smaller features have greater possibilities to contain noise particles. Accordingly, the coefficients of top-hat transformation and bottom-hat transformation are modified. Simulation results on the standard gray-level images show that the proposed EPMF method can effectively remove noise and completely preserve the edge of images. It demonstrates better performance than the conventional filtering methods.
作者：
万雄高益庆汪元美Institute of Automation of Nanjing University of Aeronautics and Astronautics
Nanjing 210016 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering
Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering
Nanchang Institute of Aeronautical Technology Nanchang 330034 novel 3-D temperature field reconstruction method is proposed in this paper which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP) the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.
A novel 3-D temperature field reconstruction method is proposed in this paper, which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength t...
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A novel 3-D temperature field reconstruction method is proposed in this paper, which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded, and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP), the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last, temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.
This paper extends some of the basic results in the area of Lyapunov (asymptotic) and finite time and practical stability to linear, discrete, time invariant time-delay systems, New definitions have been established f...
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This paper is concerned with an application study of model-based fault detection method to a ship propulsion system. When modeling the object system, Quasi-ARMAX model with multi-model form is used. In this model, the...
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Hot spring thermal energy conversion (STEC) is a system that converts heat energy into electricity by using the temperature difference between hot spring water and sea or river water. This paper describes a dynamic mo...
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Hot spring thermal energy conversion (STEC) is a system that converts heat energy into electricity by using the temperature difference between hot spring water and sea or river water. This paper describes a dynamic model of the condensation subsystem in the STEC pilot plant built by our laboratory. Simulation result and its analysis are also presented.
It is well known that the ultrasound is used in various fields like medical applications, non-destructive inspection and many other manufacturing processes. Piezoelectric transducers are used most frequently to genera...
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It is well known that the ultrasound is used in various fields like medical applications, non-destructive inspection and many other manufacturing processes. Piezoelectric transducers are used most frequently to generate ultrasound. In particular, piezoelectric ceramic transducers like PZT are used most frequently. However, for the generation of high frequency ultrasound from 10 to 20 MHz, PZT transducer is difficult to handle because thickness is less than 0.2 mm. Therefore, our purpose of study is to form PZT piezoelectric films with hydrothermal method and to develop ultrasound sensors with resonant frequency of a few MHz to a few hundreds MHz. Ultrasound sensors with resonant frequency of a few MHz which were difficult to be fabricated by conventional hydrothermal method were manufactured and their performance in water was studied and reported. These results show the feasibility of the fabrication of ultrasound sensors of frequency from a few MHz to a few hundreds MHz by hydrothermal method.
For any two n-th order polynomials a(s) and b(s), the Hurwitz stability of their convex combination is necessary and sufficient for the existence of a polynomial c(s) such that c(s)/a(s) and c(s)/b(s) are both strictl...
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