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IEEE Conference on decision and control

作者： Nikolaos Athanasopoulos George Bitsoris Marina Vassilaki Control Systems Laboratory Electrical and Computer Engineering Department University of Patras Rion 26500 Greece Department of Electrical Engineering of ASPAITE Maroussi Athens-Greece

ISBN: (纸本)9781612848006

In this paper nonlinear time-varying and bilinear discrete-time systems with additive bounded disturbances are considered. First, conditions guaranteeing uniform ultimate boundedness for time-varying nonlinear systems are established. Then, algebraic conditions ensuring the existence of polyhedral Lyapunov functions, uniform boundedness and positive invariance for closed-loop bilinear systems are obtained. Finally, these results are applied to various robust stabilization problems for bilinear systems subject to persistent additive disturbances. It is shown that these problems can be reduced to a single or a series of linear programming problems.

关键词： bilinear systems uniform ultimate boundedness bilinearity linear programming time varying

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FPGA implementation of a pipelined 2D-DCT and simplified quantization for real-time applications

FPGA implementation of a pipelined 2D-DCT and simplified qua...

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2011 International Conference on Multimedia Computing and systems, ICMCS'11

作者： Anas, Hatim Belkouch, Said El Aakif, M. Chabini, Noureddine Embedded Systems and Digital Control Laboratory National School of Applied Sciences University of Cadi Ayyad Av. Abdelkarim Khattabi Guéliz Marrakech Morocco Department of Electrical and Computer Engineering Royal Military College of Canada Kingston ON Canada

ISBN: (纸本)9781612847306

The Discrete Cosine Transform (DCT) is one of the most widely used techniques for image compression. Several algorithms are proposed to implement the DCT-2D. The scaled SDCT algorithm is an optimization of the DCT-1D, which consists in gathering all the multiplications at the end. In this paper, in addition to the hardware implementation on an FPGA, an extended optimization has been performed by merging the multiplications in the quantization block without having an impact on the image quality. Tests using MATLAB environment have shown that our proposed approach produces images with quality comparable to the ones obtained using the JPEG standard. FPGA-based implementations of this proposed approach and the Loeffler's algorithm are proposed and compared in this paper using an Altera Startix FPGA family with the synthesis and implementation tool Quartus II. Results show that our approach outperforms the well known Loeffler's algorithm in terms of processing-speed and resources used. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Experiment design for Pauli channel estimation

Experiment design for Pauli channel estimation

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作者： Balló, Gábor Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia Egyetem u. 10 H-8200 Veszprém Hungary Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences P.O. Box 63 H-1518 Budapest Hungary

ISBN: (纸本)9783902661937

Experiment design for quantum channel parameter estimation includes the design of the quantum input to the channel and the observables to be applied on the resulting quantum output system, called the experiment configuration. An experiment design procedure based on maximizing the Fisher information of the qubit Pauli channel parameters is presented in this paper. It can be shown that the Fisher information is a convex function in both the input and the experiment configuration parameters. This leads to an optimal setting that includes pure input states and projective measurements directed towards the channel directions. An iterative method of estimating the channel directions is also proposed. © 2011 IFAC.

关键词： Iterative methods

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Canonical estimation in a rare-events regime

Canonical estimation in a rare-events regime

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Annual Allerton Conference on Communication, control, and Computing

作者： Mesrob I. Ohannessian Vincent Y. F. Tan Munther A. Dahleh Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI USA

ISBN: (纸本)9781457718175

We propose a general methodology for performing statistical inference within a 'rare-events regime' that was recently suggested by Wagner, Viswanath and Kulkarni. Our approach allows one to easily establish consistent estimators for a very large class of canonical estimation problems, in a large alphabet setting. These include the problems studied in the original paper, such as entropy and probability estimation, in addition to many other interesting ones. We particularly illustrate this approach by consistently estimating the size of the alphabet and the range of the probabilities. We start by proposing an abstract methodology based on constructing a probability measure with the desired asymptotic properties. We then demonstrate two concrete constructions by casting the Good-Turing estimator as a pseudo-empirical measure, and by using the theory of mixture model estimation.

关键词： Convergence Estimation Equations Approximation methods Random variables Entropy Atmospheric measurements

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Optimal Utilization of Storage and the Induced Price Elasticity of Demand in the Presence of Ramp Constraints

Optimal Utilization of Storage and the Induced Price Elastic...

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IEEE Conference on decision and control

作者： Ali Faghih Mardavij Roozbehani Munther A. Dahleh Electrical Engineering and Computer Science (EECS) Laboratory for Information and Decision Systems (LIDS) at the Massachusetts Institute of Technology (MIT) Cambridge MA LIDS MIT EECS Department at MIT

ISBN: (纸本)9781612848006

This paper is concerned with optimal utilization of storage, characterization of the economic value of storage in the presence of ramp-rate constraints and stochastically-varying electricity prices, and characterization of the price elasticity of demand induced by optimal utilization of storage. The ramp constraints limit the charging and discharging rate of storage, and can be due to the physical limitations of the storage device or the power lines. Such constraints make analytical characterization of optimal policies particularly difficult. In this paper, the optimal utilization problem is addressed in a finite-horizon stochastic dynamic programming framework, and an analytical characterization of the value function along with recursive formulas for computation of the associated optimal policy are derived. It is shown that the value function associated with the dynamic programming problem is a piecewise linear convex function of the storage state, i.e., the amount of stored energy. Furthermore, while the economic value of storage capacity is a non-decreasing function of price volatility, it is shown that due to finite ramping rates, the value of storage saturates quickly as the capacity increases, regardless of price volatility. Finally, it is shown that optimal utilization of storage by consumers could induce a considerable amount of price elasticity, particularly near the average price.

关键词： Value of Storage Ramp Constraints Price Elasticity of Demand Stochastic Dynamic Programming

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On the Polyhedral Set-Invariance Conditions for Time-Delay systems

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IFAC Proceedings Volumes 2011年第1期44卷 308-313页

作者： Warody Lombardi Sorin Olaru Mircea Lazar Georges Bitsoris Silviu-Iulian Niculescu SUPELEC Systems Sciences (E3S) – Automatic Control Department France LSS – Laboratory of Signals and Systems SUPELEC-CNRS Gif-sur-Yvette France Department of Electrical and Computer Engineering – University of Patras Patras Greece Department of Electrical Engineering Eindhoven University of Technology Eindhoven The Netherlands

Abstract In this paper the concept of set invariance for time-delay systems is introduced with a specific attention to the linear discrete-time case. We are interested in the definition of a D(elay) -invariant set with respect to a bounded polyhedral subset of the state-space. D -invariance conditions are derived based on the Minkowski addition in a first stage, and subsequently translated in feasibility-based tests in order to obtain an efficient computation time

关键词： Set Invariance Constrained systems Time-Delay systems

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Low power and fast DCT architecture using multiplier-less method

Low power and fast DCT architecture using multiplier-less me...

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2011 Faible Tension Faible Consommation, FTFC 2011

作者： El Aakif, M. Belkouch, S. Chabini, N. Hassani, M.M. Embedded Systems and Digital Control Laboratory National School of Applied Sciences University of Cadi Ayyad Av. Abdelkarim Khattabi Guéliz Marrakech Morocco Department of Electrical and Computer Engineering Royal Military College of Canada Kingston ON Canada Faculty of Sciences Semlalia University of Cadi Ayyad Marrakech Morocco

ISBN: (纸本)9781612846477

In this paper, a low power and fast DCT (Discrete Cosine Transform) using multiplier-less method is presented with a new modified FGA (Flow-Graph Algorithm), which is derived from our previously presented FGA of DCT based on Loeffler algorithm. The multiplier-less method is based on the replacement of multiplications with a minimum number of additions and shifts. The proposed FGA is performed and compared to a previous one. The results of FPGA implementations on Altera Cyclone II show the increase of the maximum frequency, the decrease of the resources usage and the reduction of the dynamic power by 7.2 % at 120 MHz of clock frequency with a new proposed FGA algorithm. Another comparison with recent published results has been done and proves the efficiency of the proposed FGA. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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The Intertemporal Utility of Demand and Price Elasticity of Consumption in Power Grids with Shiftable Loads

The Intertemporal Utility of Demand and Price Elasticity of ...

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IEEE Conference on decision and control

作者： Mardavij Roozbehani Ali Faghih Mesrob I. Ohannessian Munther A. Dahleh Laboratory for Information and Decision Systems (LIDS) at the Massachusetts Institute of Technology (MIT) Cambridge MA Electrical Engineering and Computer Science (EECS) working at LIDS MIT Associate Head of the EECS Department at MIT

ISBN: (纸本)9781612848006

This paper presents a mathematical model of consumer behavior in response to stochastically-varying electricity prices, and a characterization of price elasticity of consumption induced by optimally shifting flexible demands within a fixed time window. The approach is based on deriving the optimal load-shifting policy through a finite horizon stochastic dynamic program, and the analysis is performed under both perfect and partial information about price distribution. An aggregate demand model is constructed from individual demands with random arrivals and random deadlines. Under this model, the aggregate demand becomes a function of price only, and thus allows for quantitative characterization of the utility of demand and price elasticity. While the demand for electricity is often deemed to be highly inelastic, it is shown in this paper that optimal load-shifting can create a considerable amount of price elasticity, even when the aggregate consumption over a long period remains constant.

关键词： Intertemporal Utility Mathematical Modeling of Consumer Behavior Price Elasticity Dynamic Programming

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Mathematical Relationships Between Representations of Structure in Linear Interconnected Dynamical systems

Mathematical Relationships Between Representations of Struct...

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2011 American control Conference (ACC)

作者： E. Yeung J. Goncalves H. Sandberg S. Warnick Control and Dynamical Systems California Institute of Technology USA Control Group Department of Engineering University of Cambridge Cambridge UK Automatic Control Laboratory KTH School of Electrical Engineering Stockholm Sweden Information and Decision Algorithms Laboratories Brigham Young University Provo UT USA

A dynamical system can exhibit structure on multiple levels. Different system representations can capture different elements of a dynamical system's structure. We consider LTI input-output dynamical systems and present four representations of structure: complete computational structure, subsystem structure, signal structure, and input output sparsity structure. We then explore some of the mathematical relationships that relate these different representations of structure. In particular, we show that signal and subsystem structure are fundamentally different ways of representing system structure. A signal structure does not always specify a unique subsystem structure nor does subsystem structure always specify a unique signal structure. We illustrate these concepts with a numerical example.

关键词： Transfer functions Periodic structures Computational modeling Equations Silicon Input variables Laboratories

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New simplified model for an under-actuated quadruped robot in bounding motion

New simplified model for an under-actuated quadruped robot i...

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International Conference on control, Instrumentation, and Automation

作者： Hamed Kazemi Vahid Johari Majd Majid M. Moghaddam Intelligent Control Systems Laboratory School of Electrical and Computer Engineering Tarbiat Moalem University Tehran Iran Intelligent Control Systems Laboratory Tarbiat Modares University Tehran Iran Robotics and Mechatronics Laboratory Mechanical Engineering Department Tarbiat Moalem University Tehran Iran Mechanical Engineering Department Tarbiat Modares University Tehran Iran

In this paper, a quadruped robot is studied in bounding motion. A new simplified model of quadruped robot in bounding motion with four actuated and two unactuated joints is developed. The kinetic and potential energies of the under-actuated mechanical model of the quadruped robot are obtained and the dynamics of the robot model is derived using the Lagrangian method. It is shown that the dynamical equation of the proposed simplified model belongs to a class of second-order nonholonomic mechanical systems. The main motivation of this paper is to obtain quadruped model in bounding motion such that one can apply different control methods directly or after transformation in the obtained dynamic equations. Utilizing MATLAB, dynamics of the planar model has been simulated in backward and forward states. Physical parameters of the Little-Dog robot as an instance of the quadruped robot are considered in simulation The simulation is without control and therefore is unstable but it illustrates robot's manner in bounding motion before instability.

关键词： Mathematical model Legged locomotion Dynamics Equations Joints Robot kinematics

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