Many discrete time anti-windup schemes for input saturated stable systems to achieve certain stability and performance criteria have been proposed in the literature. It has been shown as well that an anti-windup schem...
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when recognizing partially visible objects in a scene, a good global decision should be made based on locally gathered features for their recognition, since global information is corrupted. This local to global nature...
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ISBN:
(纸本)9781467321273;9781467321259
when recognizing partially visible objects in a scene, a good global decision should be made based on locally gathered features for their recognition, since global information is corrupted. This local to global nature of occlusion recognition leads us to spectral matching technique. Unfortunately, spectral matching algorithms are not desirable for noisy data set from cluttered scene. In this paper, a top- down procedure is introduced into spectral matching for the recognition of occluded objects. Based on the two-stage strategy, both appearance and geometric information are taken into consideration. It is shown that the improvement has been made for spectral algorithms to recognize occluded objects.
The specific relationships between the classical pole-placement state feedback, the RICCATI equation based LQ paradigm and the KALMAN frequency domain approach are discussed. It is shown that arbitrary pole placement ...
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ISBN:
(纸本)9780889869226
The specific relationships between the classical pole-placement state feedback, the RICCATI equation based LQ paradigm and the KALMAN frequency domain approach are discussed. It is shown that arbitrary pole placement is not possible by standard LQ optimality. A possible solution of this anomaly is to use more general LQ criterion with specific weights on the state, input and crossterm.
The control error in a generic two-degree of freedom (TDOF) control system can be decomposed into three major parts: design-, realizability- and modeling-loss. This new decomposition opens useful ways for practical op...
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ISBN:
(纸本)9780889869226
The control error in a generic two-degree of freedom (TDOF) control system can be decomposed into three major parts: design-, realizability- and modeling-loss. This new decomposition opens useful ways for practical optimization of TDOF systems and helps the construction of new algorithms for robust identification and control. The paper investigates the optimality of the third term.
The characteristics of reacting radicals in a flame are crucial for an in-depth understanding of the formation process of combustion emissions. This paper presents an algorithm for the prediction of NOx (NO and NO2) e...
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Many discrete time anti-windup schemes for input saturated stable systems to achieve certain stability and performance criteria have been proposed in the literature. It has been shown as well that an anti-windup schem...
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Many discrete time anti-windup schemes for input saturated stable systems to achieve certain stability and performance criteria have been proposed in the literature. It has been shown as well that an anti-windup scheme that involves directionality compensation (in the form of multivariable nonlinear algebraic loop) has an excellent transient performance. As in continuous time, however, implementation problems may arise due to the formation of an algebraic loop. In discrete time, an iterative algorithm to solve the algebraic loop that converges within a prescribed time sampling may be employed while preserving the stability and performance. Consequently, the speed of convergence may limit the application of anti-windup schemes. Alternatively, a closely related explicit static anti-windup scheme may be adopted, in which no iterative solution at each time step is required, but with a minor degradation in performance. To achieve both simple implementation and stability-performance preservation, two possible stable-multirate implementations are designed in this paper. Unlike an iterative algorithm, solving the algebraic loop is now executed only by finite number of iterations. Simulation result shows that a typical undershoot response of the explicit anti-windup scheme is now absent by allowing several iterations in this stable multirate implementation.
Advancement of computer, software, telecommunication and internet technologies during the last twenty years has fundamentally shifted the focus of the expertise in control-systems engineering (CSE) industry. It is evi...
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Advancement of computer, software, telecommunication and internet technologies during the last twenty years has fundamentally shifted the focus of the expertise in control-systems engineering (CSE) industry. It is evident that building high-quality modern control systems requires a multi-disciplinary effort as a single engineer simply cannot be an expert in all the related areas, e.g., software/computerengineering, computer science and information systems. As an experience and evidence report, this article reports on the challenges in CSE based on the authors' experience and presents observations and potential recommendations for multi-disciplinary nature of CSE. It is hoped that the article would bring awareness to the community and would be useful for the industrial practitioners and researchers working in this area in building stronger multi-disciplinary CSE teams and, ultimately, in building higher-quality modern control systems.
Identification of machine condition is crucial to reduce machine downtime and scrap parts in the manufacturing industries. In this paper, we propose a novel methodology to identify life stage and estimate machine wear...
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Identification of machine condition is crucial to reduce machine downtime and scrap parts in the manufacturing industries. In this paper, we propose a novel methodology to identify life stage and estimate machine wear. The proposed framework is based on stage identification using Support Vector Machines (SVMs) and machine wear estimation using AutoRegressive Moving Average with eXogenous inputs (ARMAX) models. Our proposed framework is evaluated on a high-speed industrial milling machine, and the effectiveness of the proposed methodology in tool wear stage identification and tool wear estimation is verified with experimental results.
The characteristics of reacting radicals in a flame are crucial for an in-depth understanding of the formation process of combustion emissions. This paper presents an algorithm for the prediction of NOx (NO and NO 2 )...
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The characteristics of reacting radicals in a flame are crucial for an in-depth understanding of the formation process of combustion emissions. This paper presents an algorithm for the prediction of NOx (NO and NO 2 ) emissions in flue gas through flame radical imaging, flame temperature monitoring and application of Neural Network techniques. Radiation images of flame radicals OH*, CN*, CH* and C 2 * are captured using an intensified multi-wavelength imaging system. Flame temperature is determined using a spectrometer and two-color pyrometry. Based on these images, the characteristic values of the flame radicals are extracted. These characteristic values, together with the flame temperature, are then used to predict NOx emissions. Experimental results from a laboratory-scale gas-fired combustion rig have shown the effectiveness of the proposed method for the prediction of NOx emissions.
We report in this case-study paper our experience and success story with a practical approach and tool for unit regression testing of a SCADA (Supervisory control and Data Acquisition) software. The tool uses a black-...
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We report in this case-study paper our experience and success story with a practical approach and tool for unit regression testing of a SCADA (Supervisory control and Data Acquisition) software. The tool uses a black-box specification of the units under test to automatically generate NUnit test code. We then improved the test suite by white-box and mutation testing. The approach and tool were developed in an action-research project to test a commercial large-scale SCADA system called Rocket.
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