Browsing by Author "Özdemir, Necati"
Now showing items 1-20 of 76
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Analysis and dynamics of a mathematical model to predict unreported cases of COVID-19 epidemic in Morocco
Hamou, Abdelouahed Alla; Rasul, Rando R. Q.; Hammouch, Zakia; Özdemir, Necati (Springer Heidelberg, 2022)In December 2019, in Wuhan, China, a new disease was detected, and the virus easily spread throughout other nations. March 2, 2020, Morocco announced 1st infection of coronavirus. Morocco verified a total of 653,286 cases, ... -
Analysis of an axis-symmetric fractional diffusion-wave problem
Özdemir, Necati; Agrawal, O. P; Karadeniz, Derya; İskender, Beyza Billur (IOP Publishing Ltd, 2009)This paper presents an axis-symmetric fractional diffusion-wave problem which is considered in polar coordinates. The dynamic characteristics of the system are described with a partial fractional differential equation in ... -
Analysis of an epidemic spreading model with exponential decay law
Yavuz, Mehmet; Özdemir, Necati (Murat Tosun, 2020)Mathematical modeling of infectious diseases has shown that combinations of isolation, quarantine,vaccine, and treatment are often necessary in order to eliminate most infectious diseases. Continuousmathematical models ... -
Black-Scholes opsiyon fiyatlama denkleminin üzerine bir inceleme
Çoban, Ahmet (Balıkesir Üniversitesi Fen Bilimleri Enstitüsü, 2023)Bu tezde finans matematiği ve opsiyon fiyatlama alanında kullanılan Black-Scholes Kısmi Diferansiyel Denkleminin tarihsel gelişimi anlatılmıştır. Tezin ilk bölümünde opsiyon fiyatlama üzerine tarihsel çalışmalar, Brown ... -
Comparing the new fractional derivative operators involving exponential and Mittag-leffler kernel
Yavuz, Mehmet; Özdemir, Necati (Amer Inst Mathematical Sciences-AIMS, 2020)In this manuscript, we have proposed a comparison based on newly defined fractional derivative operators which are called as Caputo-Fabrizio (CF) and Atangana-Baleanu (AB). In 2015, Caputo and Fabrizio established a new ... -
Complex valued neural network with Mobius activation function
Özdemir, Necati; İskender, Beyza Billur; Özgür, Nihal Yılmaz (Elsevier Science Bv, 2011)In this work, we propose a new type of activation function for a complex valued neural network (CVNN). This activation function is a special Mobius transformation classified as reflection. It is bounded outside of the unit ... -
Conformable fractional wave-like equation on a radial symmetric plate
Avcı, Derya; Eroğlu, Beyza Billur İskender; Özdemir, Necati (Springer Verlag, 2017)The generalization of physical processes by using local or nonlocal fractional operators has been an attractive research topic over the last decade. Fractionalization of integer order models gives quite reality to mathematical ... -
Conformable heat equation on a radial symmetric plate
Avcı, Derya; İskender Eroğlu, Beyza Billur; Özdemir, Necati (Vinca Inst Nuclear Sci, 2017)The conformable heat equation is defined in terms of a local and limit-based definition called conformable derivative which provides some basic properties of integer order derivative such that conventional fractional ... -
Constrained optimal control of a fractionally damped elastic beam
Eroğlu, Beyza Billur İskender; Avcı, Derya; Özdemir, Necati (Walter De Gruyter GMBH, 2020)This work presents the constrained optimal control of a fractionally damped elastic beam in which the damping characteristic is described with the Caputo fractional derivative of order 1/2. To achieve the optimal control ... -
Context Sensitive Links 1 of 1 Microencapsulation of basil essential oil: utilization of gum arabic/whey protein isolate/maltodextrin combinations for encapsulation efficiency and in vitro release
Özdemir, Necati; Bayrak, Ali; Tat, Tuba; Altay, Filiz; Kıralan, Mustafa; Kurt, Abdullah (Springer, 2021)Basil (Ocimum basilicum L.) essential oil (BEO) draws attention for its phenolic acid content which causes it to be used as a medicinal agent and food additive. However, its vulnerability to environmental and technological ... -
Control of thermal stresses in axissymmetric problems of fractional thermoelasticity for an infinite cylindrical domain
Povstenko, Yuriy; Avcı, Derya; Eroğlu, Beyza Billur İskender; Özdemir, Necati (Vinca Inst Nuclear Sci, 2017)In this paper, we study a control problem of thermal stresses in an infinite cylindrical body. The temperature distribution is defined by the time-fractional heat conduction equation with the Caputo derivative of the order ... -
Description of multi-periodic signals generated by complex systems: Nocfass - new possibilities of the fourier analysis
Nigmatullin, Raoul R.; Alexandrov, Vadim S.; Agarwal, Praveen; Jain, Shilpi; Özdemir, Necati (Amer Inst Mathematical Sciences-AIMS, 2022)Here, we show how to extend the possibilities of the conventional F-analysis and adapt it for quantitative description of multi-periodic signals recorded from different complex systems. The basic idea lies in filtration ... -
A different approach to the european option pricing model with new fractional operator
Yavuz, Mehmet; Özdemir, Necati (Edp Sciences S A, 2018)In this work, we have derived an approximate solution of the fractional Black-Scholes models using an iterative method. The fractional differentiation operator used in this paper is the well-known conformable derivative. ... -
Digital variable sampling integral control of infinite dimensional systems subject to input nonlinearity
Özdemir, Necati (IEEE-Inst Electrical Electronics Engineers Inc, 2009)In this technical note we present a novel sampled-data low-gain I-control algorithm for infinite-dimensional systems in the presence of input nonlinearity. The system is assumed to be exponentially stable with invertible ... -
Digital variable sampling integral control of infinite-dimensional systems
Özdemir, Necati (2000)In this paper we present sampled-data low-gain I-control algorithms for infinite-dimensional systems in which the sampling period is not constant. The system is assumed to be exponentially stable with invertible steady ... -
The dirichlet problem of a conformable advection-diffusion equation
Avcı, Derya ; Eroğlu, Beyza Billur İskender; Özdemir, Necati (Vinca Inst Nuclear Sci, 2017)The fractional advection-diffusion equations are obtained from a fractional power law for the matter flux. Diffusion processes in special types of porous media which has fractal geometry can be modelled accurately by using ... -
Duhem histerisis girişli doğrusal sistemlerin oransal integral kontrolü
İskender, Beyza Billur (Balıkesir Üniversitesi Fen Bilimleri Enstitüsü, 2007)Bilim ve teknolojinin birçok alanında meydana gelen histerisis olgusu son zamanlarda uygulamaları açısından oldukça önem kazanmıştır. Bu uygulamalar beraberinde histerisisin istenmeyen etkilerinden kurtulmayı getirmiş ve ... -
Dynamic analysis of a fractional svir system modeling an infectious disease
Özdemir, Necati; Uçar, Esmehan; Avcı, Derya (Univ Nis, 2022)Infectious diseases that spread by microorganisms, viruses and bacteria that can be transmitted very quickly from person to person and have negative effect on public health should be treated as soon as possible. In order ... -
A dynamic system approach for solving nonlinear programming problems with exact penalty function
Özdemir, Necati; Evirgen, Fırat (Vilnius Gediminas Technical Univ Press, 2008)The Dynamic system has attracted increasing attention in recent years. In this paper, a dynamic system approach for solving Nonlinear Programming (NLP) problems with inequality constrained is presented. First, the system ... -
A dynamic system approach to quadratic programming problems with penalty method
Özdemir, Necati; Evirgen, Fırat (Malaysian Mathematical Sciences Soc, 2010)In this work, we propose a dynamical system (state space) model approach to find a unique minimum of quadratic programming (QP) problem,;, with equality constrained. The unique minimum of the optimization problem is also ...
