Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Type "Article"
Now showing items 1-20 of 1334
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2-step nilpotent lie groups of higher rank
(2002)We construct a family of simply connected 2-step nilpotent Lie groups of higher rank such that every geodesic lies in a flat. These are as Riemannian manifolds irreducible and arise from real representations of compact Lie ...
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3rd Annual European Rheology Conference (AERC 2006), Hersonisos, Crete, Greece, 27-29 April 2006
(2007)
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AAA Note on the Behaviour of Nonparametric Density and Spectral Density Estimators at Zero Points of their Support
(2015)The asymptotic behaviour of nonparametric estimators of the stationary density and of the spectral density function of a stationary process have been studied in some detail in the last 50-60years. Nevertheless, less is ...
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Absolutely monotonic functions related to Euler's gamma function and Barnes' double and triple gamma function
(2011)It is shown that the remainders in asymptotic expansions of the logarithm of Barnes double and triple gamma function and Euler's gamma function are Laplace transformations of positive multiples of absolutely monotonic ...
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Adaptive bandwidth choice
(2003)In this paper, we consider the problem of bandwidth choice in the parallel settings of nonparametric kernel smoothed spectra] density and probability density estimation. We propose a new class of 'plug-in' type bandwidth ...
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Adaptive control for a class of large scale non-linear systems
(2005)The design of stabilizing controllers for multi-input multi-output (MIMO) non-linear plants with unknown non-linearities is a challenging problem. The inability to identify the non-linearities on-line or off-line accurately ...
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Adaptive control of a class of slowly time varying systems with modeling uncertainties
(2005)In a recent work, a new linear adaptive controller based on certainty-equivalence and backstepping design, which promises a level of transient and asymptotic performance comparable to that of the tuning functions adaptive ...
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Adaptive control of linear time-varying plants
(1987)In this paper the model reference adaptive control (MRAC) problem of a class of linear time-varying (LTV) plants is considered. The plant parameters are assumed to be smooth, bounded functions of time which satisfy the ...
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Adaptive Control of Linear Time-Varying Plants: A New Model Reference Controller Structure
(1989)In this paper we study the problem of developing a control law which can force the output of a linear time-varying plant to track the output of a stable linear time-invariant reference model. We first show that the standard ...
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Adaptive control of time‐varying plants: Simple examples
(1988)The design and properties of an adaptive model reference scheme and an adaptive pole placement control scheme for linear time‐varying plants are demonstrated via two simple examples. The two new schemes combine new control ...
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Adaptive control of unmanned aerial vehicles in atmospheric flight with reduced models
(2007)We propose an approximate implementation scheme for an adaptive linear quadratic control structure by employing a balanced truncation procedure in the loop prior to solving the associated Algebraic Riccati Equation (ARE). ...
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Adaptive LQ control with anti-windup augmentation to optimize UAV performance in autonomous soaring applications
(2008)The performance of a glider can be considerably improved by means of soaring and optimization of its trajectory. Recent advances in the area of static soaring assume known linear glider dynamics and no actuator saturation ...
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Adaptive mixing control with multiple estimators
(2012)A recently proposed adaptive control scheme with mixing involves the use of precalculated candidate controllers whose output is weighted on the basis of the parameter estimates generated by an online parameter estimator. ...
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Adaptive mode-suppression and disturbance-rejection scheme with application to disk drives
(2009)The goal of a track-following controller for a disk drive is to maintain as close to perfect tracking as possible. Better tracking allows for more data to be stored on a single disk. There are several factors which make ...
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Adaptive notch filter using real-time parameter estimation
(2011)The control of flexible systems is often difficult due to the exact frequencies of the elastic modes being hard to identify. These flexible modes may change over time, or vary between units of the same system. The variation ...
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Adaptive quadratic functional estimation of a weighted density by model selection
(2010)We consider the problem of estimating the integral of the square of a probability density function f on the basis of a random sample from a weighted distribution. Specifically, using model selection via a penalized criterion, ...
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Adaptive sliding mode control design for a hypersonic flight vehicle
(2004)A multi-input/multi-output adaptive sliding controller is designed and analyzed for the longitudinal dynamics of a generic hypersonic air vehicle. This vehicle model is nonlinear, multivariable, and unstable and includes ...
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Adaptive stabilization of not necessarily minimum phase plants
(1986)We show that a first-order adaptive regulator can stabilize any linear time-invariant plant (LTI) whose transfer function has arbitrary relative degree and order, and is not necessarily minimum phase, provided the dominant ...
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Adaptive steering control for uncertain ship dynamics and stability analysis
(2013)Marine transportation offers a cost-effective and viable alternative to cargo aircraft, trains, and trucks in general. Traffic control in congested waterways has recently become a challenging task demanding higher accuracy ...