作者:
Sima, VasileAdvanced Research
National Institute for Research and Development in Informatics Bd. Mareşal Averescu Nr. 8-10 Bucharest Romania
Improved algorithms for solving continuous-time algebraic Riccati equations using Newton's method with or without line search are discussed. the basic theory and Newton's algorithms are briefly presented. Algo...
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ISBN:
(纸本)9789898565709
Improved algorithms for solving continuous-time algebraic Riccati equations using Newton's method with or without line search are discussed. the basic theory and Newton's algorithms are briefly presented. Algorithmic details the developed solvers are based on, the main computational steps (finding the Newton direction, finding the Newton step size), and convergence tests are described. the main results of an extensive performance investigation of the solvers based on Newton's method are compared withthose obtained using the widely-used MATLAB solver. Randomly generated systems with orders till 2000, as well as the systems from a large collection of examples, are considered. the numerical results often show significantly improved accuracy, measured in terms of normalized and relative residuals, and greater efficiency than the MATLAB solver. the results strongly recommend the use of such algorithms, especially for improving the solutions computed by other solvers.
this book constitutes the thoroughly refereed post-conference proceedings of the 5thinternational Joint conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2012, held in Vilamoura, Portugal, in Feb...
ISBN:
(数字)9783642382567
ISBN:
(纸本)9783642382550;9783642382567
this book constitutes the thoroughly refereed post-conference proceedings of the 5thinternational Joint conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2012, held in Vilamoura, Portugal, in February 2012. the 26 revised full papers presented together with one invited lecture were carefully reviewed and selected from a total of 522 submissions. the papers cover a wide range of topics and are organized in four general topical sections on biomedical electronics and devices; bioinformatics models, methods and algorithms; bio-inspired systems and signal processing; healthinformatics.
An important task in underwater autonomous vehicle swarm management is the knowledge of the graph topology, to be obtained withthe minimum possible communication exchanges and amid heavy interferences and background ...
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ISBN:
(纸本)9789898565709
An important task in underwater autonomous vehicle swarm management is the knowledge of the graph topology, to be obtained withthe minimum possible communication exchanges and amid heavy interferences and background noises. Despite the importance of the task, this problem is still partially unsolved. Recently, the Fast Fourier Transform and the addition of white noise to consensus signals have been proposed independently to determine respectively the laplacian spectrum and the adjacency matrix of the graph of interacting agents from consensus time series, but both methodologies suffer technical difficulties. In this paper, we combine them in order to simplify calculations, save energy and avoid topological reconstruction errors using only the largest eigenvalue of the spectrum and instead of white noise, a high frequency, low amplitude noise. Numerical simulations of several swarms (random, small-world, pipeline, grid) show an exact reconstruction of the configuration topologies.
there are short cycle, intensity disturbance and other characteristics about formation of subsided wetlands in mining coal area with higher groundwater table, there are also differences to general wetlands about conve...
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ISBN:
(纸本)9780769549323;9781467356527
there are short cycle, intensity disturbance and other characteristics about formation of subsided wetlands in mining coal area with higher groundwater table, there are also differences to general wetlands about convension of "carbon sources, carbon sinks" and succession law, it has been a focus of attention about coal mining area of ecological restoration. the article aims to reveal the spatial and temporal changes characteristics, control elements of "carbon pool" in subsided wetlands, to reveal succession rules of "carbon sinks" in subsided coal mining wetlands with higher groundwater table. To present based target of ecological restoration with carbon of "adding sinks, source reduction" in mining coal subsided wetlands with higher groundwater table.
this paper deals withthe problem of detecting nolinear systems' parametric faults modeled as changes in the eigenvalues of a local linear state-space model. the linear state-space model approximations are obtaine...
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ISBN:
(纸本)9789898565709
this paper deals withthe problem of detecting nolinear systems' parametric faults modeled as changes in the eigenvalues of a local linear state-space model. the linear state-space model approximations are obtained by recursive subspace system identification techniques, from which the eigenvalues are extracted at each sampling time. Residuals are generated by comparing the eigenvalues against those associated with a local nominal model derived from a neural network predictor describing the nonlinear plant dynamics in free fault conditions. Parametric fault symptoms are generated from the eigenvalues residuals, whenever a given predefined threshold is exceeded. the feasibility and effectiveness of the proposed framework is demonstrated in a practical case study.
this study focuses on a stabilizing control for the electrically-assisted bicycle equipping a power-steering system. We have developed the power-steering system for the bicycle on whose front seat a child sits. the po...
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ISBN:
(纸本)9781479952007
this study focuses on a stabilizing control for the electrically-assisted bicycle equipping a power-steering system. We have developed the power-steering system for the bicycle on whose front seat a child sits. the power-steering system has the ability to recover the maneuverability of handlebars compromised by a child sitting on the front seat. the power-steering system has also capability to realize automatic stabilization. Hence, in this paper, 1) a simple inverted pendulum model is introduced to simulate the behavior of the bicycle, and 2) a stabilizing control is designed based on the simple model.
Bevel-tipped flexible needles can be steered to reach clinical targets along curvilinear paths in 3D while avoiding obstacles. Steering by duty-cycled rotation increases the versatility of this approach by providing p...
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ISBN:
(纸本)9789898565716
Bevel-tipped flexible needles can be steered to reach clinical targets along curvilinear paths in 3D while avoiding obstacles. Steering by duty-cycled rotation increases the versatility of this approach by providing proportional control of trajectory curvature. this paper presents computationally efficient techniques for path planning and path-following control for this application, using a 3D simulated brain environment. Path planning algorithms for this class of steerable needles have been developed using Rapidly-exploring Random Trees (RRTs). this paper expands on these methods, using quaternions for representation of rotation, and enhancing computational efficiency through use of interpolation, and by relaxing the entry constraint. For path-following, a look-ahead proportional controller for position and orientation is presented. Simulations in a 3D brain-like environment demonstrate the performance of the proposed planner and path-following controller. the look-ahead is seen to improve path-following performance.
In the current perspectives, renewable power sources bring new challenges for the power distribution. Substantial advances in the reliability and flexibility in the overall power consumption can be achieved via a netw...
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ISBN:
(纸本)9789898565389
In the current perspectives, renewable power sources bring new challenges for the power distribution. Substantial advances in the reliability and flexibility in the overall power consumption can be achieved via a network of intelligent and controllable appliances, especially on the micro level, i.e. on the level of individual electric appliances within the scope of one household or one institution. In the paper, we identify the typical problems of the smart household approach and present a communication and control model which offers a solution to these problems based on the multi-agent system approach.
the proceedings contain 196 papers. the topics discussed include: data-based tuning of pi controllers for vertical three-tank systems;differential evolution in parameter identification - fuel cell as an example;a prop...
ISBN:
(纸本)9789898565211
the proceedings contain 196 papers. the topics discussed include: data-based tuning of pi controllers for vertical three-tank systems;differential evolution in parameter identification - fuel cell as an example;a proposal of multiobjective fuzzy regulator design for state space nonlinear systems;rotor speed sensor fault detection in induction motors;visual anomaly detection in production plants;global optimal solution to SLAM problem with unknown initial estimates;spacecrafts' control systems effective variants choice with self-configuring genetic algorithm;robust arbitrary reference command tracking with application to hydraulic actuators;an application of goal programming technique for reconfiguration of transfer lines;a control strategy for reducing fuel consumption in a hybrid electric vehicle;and towards manufacturing execution systems for the food and beverage packaging industry.
the proceedings contain 196 papers. the topics discussed include: data-based tuning of pi controllers for vertical three-tank systems;differential evolution in parameter identification - fuel cell as an example;a prop...
ISBN:
(纸本)9789898565211
the proceedings contain 196 papers. the topics discussed include: data-based tuning of pi controllers for vertical three-tank systems;differential evolution in parameter identification - fuel cell as an example;a proposal of multiobjective fuzzy regulator design for state space nonlinear systems;rotor speed sensor fault detection in induction motors;visual anomaly detection in production plants;global optimal solution to SLAM problem with unknown initial estimates;spacecrafts' control systems effective variants choice with self-configuring genetic algorithm;robust arbitrary reference command tracking with application to hydraulic actuators;an application of goal programming technique for reconfiguration of transfer lines;a control strategy for reducing fuel consumption in a hybrid electric vehicle;and towards manufacturing execution systems for the food and beverage packaging industry.
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