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3D Scene Restoration Using One Active PTZ Camera

AIP Conference Proceedings 2009年第1期1186卷 383-390页

作者： K. M. Alexiev I. N. Nikolova G. S. Zapryanov aDepartment of Mathematical Methods for Sensor Information Processing Institute for Parallel Processing Bulgarian Academy of Sciences 25A Acad. “G.Bonchev” str. Sofia 1113 Bulgaria bDepartment of Computer Systems Faculty of Computer Systems and Control Technical University of Sofia 8 Kl. Ohridski Blvd. bl 1 Sofia 1000 Bulgaria

The paper considers the task of recovery of 3D information about the scene from single camera images. The basic idea is to extract the useful depth information from the images automatically and efficiently. Depth perception with single standard video surveillance camera is a challenging problem. The difficulties in deriving the distance to the observed objects in the scene can be partially overcome using active PTZ cameras and suitable control of camera parameters. There are several techniques for depth recovery. Here, the task of depth estimation in the context of the well known depth from defocus approach is considered. In this paper, it is proposed the problem to be solved as classical nonlinear line fitting optimization problem. The characteristics of the approach are discussed. Experimental studies, using test patterns and real objects are presented.

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Model predictive control of fuel cell micro cogeneration systems

Model predictive control of fuel cell micro cogeneration sys...

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2009 IEEE International Conference on Networking, Sensing and control, ICNSC 2009

作者： Houwing, Michiel Negenborn, Rudy R. Ilic, Marija D. Schutter, Bart De Faculty of Technology Policy and Management of Delft University of Technology Jaffalaan 5 2628 BX Delft Netherlands Departments of Electrical and Computer Engineering and Engineering and Public Policy Carnegie MellonUniversity Pittsburgh PA United States Delft Center for Systems and Control of Delft University of Technology Mekelweg 2 2628 CD Delft Netherlands Marine and Transport Technology Department of Delft University of Technology Netherlands

ISBN: (纸本)9781424434923

With the increasing application of distributed energy resources and information technologies in the electricity infrastructure, innovative possibilities for incorporating the demand side more actively in power system operation are enabled. At the residential level energy costs could be reduced with intelligent price-based control concepts (demand response). A promising, controllable, residential distributed generation technology is micro cogeneration (micro-CHP). Micro-CHP is an energy efficient technology that simultaneously provides heat and electricity to households during operation. This paper presents a detailed model of a household using a proton exchange membrane fuel cell (PEMFC) micro- CHP system in conjunction with heat storage options to fulfil its heat and part of its electricity demand. Furthermore, a decentralised controller based on a model predictive control (MPC) strategy is proposed. MPC can take benefit of future knowledge on prizes and energy demands and can therefore lead to better system performance. In simulations the performance of the MPC-controlled PEMFC system is illustrated under different conditions regarding energy pricing, domestic energy demand, and system configuration. © 2009 IEEE.

关键词： Model predictive control

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Optimization of maintenance for power system equipment using a predictive health model

Optimization of maintenance for power system equipment using...

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Power Tech Conference

作者： G. Bajracharya T. Koltunowicz R. R. Negenborn Z. Papp D. Djairam B. De Schutter J. J. Smit Faculty of Electrical Engineering Mathematics and Computer Science Department High-voltage Components and Power Systems Delft University of Technnology Delft Netherlands Delft Center of Systems and Control Delft University of Technnology Delft Netherlands TNO Science and Industry Delft Netherlands Faculty of Electrical Engineering Mathematics and Computer Science Department High-voltage Components and Power Systems Transport Technology Department Delft University of Technnology Delft Netherlands

In this paper, a model-predictive control based framework is proposed for modeling and optimization of the health state of power system equipment. In the framework, a predictive health model is proposed that predicts the health state of the equipment based on its usage and maintenance actions. Based on the health state, the failure rate of the equipment can be estimated. We propose to use this predictive health model to predict the effects of different maintenance actions. The effects of maintenance actions over a future time window are evaluated by a cost function. The maintenance actions are optimized using this cost function. The proposed framework is applied in the optimization of the loading of transformers based on the thermal degradation of the paper insulation.

关键词： Power system modeling Predictive models Aging Cost function Marine technology Power transformer insulation Predictive maintenance Power system management Investments Power system reliability

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Throwing motion generation using nonlinear optimization on a 6-degree-of-freedom robot manipulator

Throwing motion generation using nonlinear optimization on a...

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International Conference on Mechatronics (ICM)

作者： Ferenc Lombai Gabor Szederkenyi Faculty of Information Technology Pázmány Péter Catholic University Budapest Hungary Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

A 6-degree-of-freedom rigid robot arm and its throwing motion generation is described in this paper. The trajectories for the joint variables are generated off-line as a cubic spline obtained using general constrained nonlinear optimization, taking into consideration limitations (position, speed, acceleration and jerk) of the joint actuators, and the current limit of the whole structure. The obtained trajectories are previously checked to avoid collisions using oriented bounding boxes and their separating axis theorem tests. The trajectory tracking of the individual joint is done using a discrete-time constrained optimal control technique.

关键词： Robots Manipulators Constraint optimization Trajectory Motion planning Robotics and automation Humans Motion measurement Mechatronics Automatic control

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Developing collaborative peer-to-peer applications on mobile devices

Developing collaborative peer-to-peer applications on mobile...

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International Conference on computer Supported Cooperative Work in Design

作者： Claudio Sapateiro Nelson Baloian Pedro Antunes Gustavo Zurita Systems and Informatics Department Polytechnic Institute of Setύbal Portugal Department of Computer Science University of Chile Santiago Chile Informatics Department Faculty of Sciences University of Lisbon Portugal Management Control and Information Systems Department Business School Universidad de Chile Chile

ISBN: (纸本)9781424435340

Mobile computing has experienced a rapid growth and there are nowadays many applications being developed. According to the literature, many of these applications are designed for collaborative work or learning and share the same requirements: they implement a peer-to-peer communication architecture, there are subgroups inside the group of participants which have to work together and coordinate with the rest of the groups and they need to implement a proper human-computer interaction paradigm since they have a reduced area to interact with the application's interface. It is then quite natural to think about the development of a framework supporting this kind of applications. In this paper we present such a framework and an example of its application.

关键词： Collaboration Peer to peer computing Collaborative work Application software Mobile computing computer architecture Middleware Mobile communication Handheld computers Collaborative software

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Fractional-order memristive systems

Fractional-order memristive systems

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Ivo Petráš YangQuan Chen Calvin Coopmans Institute of Control and Informatization of Production Processes BERG Faculty Technical University of Košice Kosice Slovakia Center for Self-Organizing and Intelligent Systems (CSOIS) Electrical and Computer Engineering Department Utah State University Logan UT USA

This paper deals with the concept of (integer-order) memristive systems, which are generalized to non-integer order case using fractional calculus. We consider the memory effect of the fractional inductor (fractductor), fractional capacitor and fractional memristor. We also show that the memory effect of such devices can be also used for an analogue implementation of the fractional-order operator, namely fractional-order integral and fractional-order derivatives. This kind of operator is useful for realization of the fractional-order controllers. We present theoretical description of such implementation and we proposed the practical realization and did some simulations and experimental measurements as well.

关键词： Memristors Fractional calculus Inductors Capacitors Voltage Circuit simulation Resistors Temperature Phase change memory control systems

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Droop based control of parallel-connected single-phase inverters in D-Q rotating frame

Droop based control of parallel-connected single-phase inver...

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IEEE International Conference on Industrial Technology (ICIT)

作者： Saeed Golestan Mahmood Joorabian Hasan Rastegar Arman Roshan Josep M. Guerrero Faculty of Electrical Engineering Amirkabir University of Technology슠 Tehran Iran Shahid Chamran University Ahvaz Iran Center of Power Electronics Systems Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Automatic Control Systems Computer Engineering Universitat Poliltècnica de Catalunya Barcelona Spain

ISBN: (纸本)9781424435067

In this paper, control of parallel single-phase inverters in direct-quadrature(DQ) rotating frame based on droop method is proposed. For each inverter, a secondary orthogonal imaginary circuit is created to provide the second phase required for the transformation; thus a DQ model of the inverter is obtained. The DQ transformation provides a time-invariant model of the inverter which makes the control design similar to that of dc-dc converters. The recognition of this analogy is important in that all of advanced dc-dc converters control techniques that have been previously developed can be applied to the control parallel inverters. The controller then is designed in DQ frame. Theoretically, infinite loop gain can be achieved in DQ rotating frame resulting in the elimination of the steady state error at the fundamental frequency of the inverter. The output impedance of the inverters is also considered, to ensure the decoupling between active and reactive power control using droop method. Simulation results are provided to prove the concept.

关键词： Inverters Communication system control Circuits DC-DC power converters Uninterruptible power systems Power system reliability control systems control design Frequency Reactive power control

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Model predictive control of fuel cell micro cogeneration systems

Model predictive control of fuel cell micro cogeneration sys...

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IEEE International Conference on Networking, Sensing and control

作者： Michiel Houwing Rudy R. Negenborn Marija D. Ilic Bart De Schutter Electic Energy Systems Group of Carnegie Mellon University Pittsburgh PA USA Faculty of Technology Policy and Management Delft University of Technnology Delft Netherlands Delft Center of Systems and Control Delft University of Technnology Delft Netherlands Departments of Electrical and Computer Engineering and Engineering and Public Policy Carnegie Mellon University Pittsburgh PA USA Control of Future Electricity Network Operations Faculty of Technology Delft University of Technnology Delft Netherlands Marine and Transport Technology Department Delft University of Technnology Netherlands

With the increasing application of distributed energy resources and information technologies in the electricity infrastructure, innovative possibilities for incorporating the demand side more actively in power system operation are enabled. At the residential level energy costs could be reduced with intelligent price-based control concepts (demand response). A promising, controllable, residential distributed generation technology is micro cogeneration (micro-CHP). Micro-CHP is an energy efficient technology that simultaneously provides heat and electricity to households during operation. This paper presents a detailed model of a household using a proton exchange membrane fuel cell (PEMFC) micro-CHP system in conjunction with heat storage options to fulfil its heat and part of its electricity demand. Furthermore, a decentralised controller based on a model predictive control (MPC) strategy is proposed. MPC can take benefit of future knowledge on prizes and energy demands and can therefore lead to better system performance. In simulations the performance of the MPC-controlled PEMFC system is illustrated under different conditions regarding energy pricing, domestic energy demand, and system configuration.

关键词： Predictive models Predictive control Fuel cells Cogeneration Resistance heating Power system modeling Distributed control Energy resources Information technology Costs

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A new method for characterization of coronary plaque composition via IVUS images

A new method for characterization of coronary plaque composi...

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IEEE International Symposium on Biomedical Imaging

作者： Arash Taki Alireza Roodaki Olivier Pauly S. K. Setarehdan Gozde Unal Nassir Navab Department of Computer Aided Medical Procedures (CAMP) Technical University Munich Munich Germany Department of Signal Processing and Electronic Systems Supelec Gif-sur-Yvette France Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran Faculty of Engineering and Natural Sciences Sabanci University Turkey

ISBN: (纸本)9781424439317

IVUS-derived virtual histology (VH) permits the assessment of atherosclerotic plaque morphology by using radiofrequency analysis of ultrasound signals. However, it requires the acquisition to be ECG-gated, which is a major limitation of VH. Indeed, its computation can only be performed once per cardiac cycle, which significantly decreases the longitudinal resolution of VH. To overcome this limitation, the introduction of an image-based plaque characterization is of great importance. Current IVUS image processing techniques do not allow adequate identification of the coronary artery plaques. This can be improved by defining appropriate features for the different kinds of plaques. In this paper, a novel feature extraction method based on Run-length algorithm is presented and used for improving the automated characterization of the plaques within the IVUS images. The proposed feature extraction method is applied to 200 IVUS images obtained from five patients. As a result an accuracy rate of 77% was achieved. Comparing this to the accuracy rates of 75% and 71% obtained using co-occurrence and local binary pattern methods respectively indicates the superior performance of the proposed feature extraction method.

关键词： Feature extraction Gray-scale Biomedical engineering Radio frequency Image resolution Signal processing Signal analysis Ultrasonic imaging Signal resolution Arteries

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Fractional Order control - A Tutorial

Fractional Order Control - A Tutorial

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2009 American control Conference (ACC 2009)

作者： YangQuan Chen Ivo Petras Dingyu Xue Center for Self-Organizing and Intelligent Systems (CSOIS) Department of Electrical and Computer Engineering Utah State University 4120 Old Main Hill Logan UT 84322-4120 USA Institute of Control and Informatization of Production Processes BERG Faculty Technical University of Kosice B. Nemcovej 3 042 00 Kosice Slovak Republic Faculty of Information Sciences and Engineering Northeastern University Shenyang 110004 P R China

ISBN: (纸本)9781424445233

Many real dynamic systems are better characterized using a non-integer order dynamic model based on fractional calculus or, differentiation or integration of non-integer order. Traditional calculus is based on integer order differentiation and integration. The concept of fractional calculus has tremendous potential to change the way we see, model, and control the nature around us. Denying fractional derivatives is like saying that zero, fractional, or irrational numbers do not exist. In this paper, we offer a tutorial on fractional calculus in controls. Basic definitions of fractional calculus, fractional order dynamic systems and controls are presented first. Then, fractional order PID controllers are introduced which may make fractional order controllers ubiquitous in industry. Additionally, several typical known fractional order controllers are introduced and commented. Numerical methods for simulating fractional order systems are given in detail so that a beginner can get started quickly. Discretization techniques for fractional order operators are introduced in some details too. Both digital and analog realization methods of fractional order operators are introduced. Finally, remarks on future research efforts in fractional order control are given.

关键词： Tutorial Fractional calculus control systems Three-term control Electrical equipment industry Industrial control Numerical simulation Voltage Propagation losses Transmission line theory

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