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- George E. Chatzarakis
- IEEE Trans. Education
- 2009

- George E. Chatzarakis, George N. Miliaras
- J. Applied Mathematics
- 2011

We investigate the asymptotic behavior of the solutions of a neutral type difference equation of the form Δ x n cx τ n p n x σ n 0, where τ n is a general retarded argument, σ n is a general deviated argument retarded or advanced , c ∈ R, p n n≥0 is a sequence of positive real numbers such that p n ≥ p, p ∈ R , and Δ denotes the forward difference operator… (More)

- Athanasios D. Panagopoulos, Pantelis-Daniel M. Arapoglou, George E. Chatzarakis, John D. Kanellopoulos, Panayotis G. Cottis
- IEEE Communications Letters
- 2005

- Lambros Ekonomou, S. Lazarou, George E. Chatzarakis, Vasiliki Vita
- Simulation Modelling Practice and Theory
- 2012

Article history: Received 22 December 2010 Received in revised form 25 September 2011 Accepted 28 September 2011 Available online 13 November 2011

Consider the first-order advanced difference equation of the form ∇x(n) − p(n)x(µ(n)) = 0, n ≥ 1, [∆x(n) − p(n)x(ν(n)) = 0, n ≥ 0], where ∇ denotes the backward difference operator ∇x(n) = x(n) − x(n − 1), ∆ denotes the forward difference operator ∆x(n) = x(n + 1) − x(n), {p(n)} is a sequence of nonnegative real numbers, and {µ(n)} [{ν(n)}] is a sequence of… (More)

- V. VITA, A. VITAS, G. E. CHATZARAKIS
- 2011

Iterative learning control (ILC) is used to control systems that operate in a repetitive mode, improving tracking accuracy of the control by transferring data from one repetition of a task, to the next. In this paper an optimal iterative learning algorithm for discrete linear systems is designed and implemented. The design and implementation that have been… (More)

- George E. Chatzarakis, Josef Diblík, George N. Miliaras, Ioannis P. Stavroulakis
- Applied Mathematics and Computation
- 2014

The asymptotic behavior of the solutions to a neutral difference equation of the form

- Sotirios A. Kanellopoulos, Charilaos I. Kourogiorgas, Athanasios D. Panagopoulos, Spiros N. Livieratos, George E. Chatzarakis
- IEEE Communications Letters
- 2014

This paper presents a new sufficient condition for the oscillation of all solutions of difference equations with several deviating arguments and oscillating coefficients. Corresponding difference equations of both retarded and advanced type are studied. Examples illustrating the results are also given.