Eastern Mediterranean University

Famagusta, Cyprus

The Eastern Mediterranean University , located in Northern Cyprus, was established in 1979 under the leadership of Onay Fadıl Demirciler as a higher-education institution of technology for Turkish Cypriots. In 1986, it was converted to a state university. The campus is located 10 km from the city of Famagusta.The university has 139 programs offering undergraduate and postgraduate degrees, as well as a research infrastructure. The medium of instructions are in Turkish and English. However, English Preparatory School is available for students who need to improve their English. The university offers variety of sports and social activities. Academic Programs of EMU are broad and include Physical and Social science with considerable research studies via Research Advisory Board. Wikipedia.

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Guler M.,Eastern Mediterranean University
Neural computation | Year: 2013

The excitability of cells is facilitated by voltage-gated ion channels. These channels accommodate a multiple number of gates individually. The possible impact of that gate multiplicity on the cell's function, specifically when the membrane area is of limited size, was investigated in the author's prior work (Güler, 2011 ). There, it was found that a nontrivially persistent correlation takes place between the transmembrane voltage fluctuations (also between the fluctuations in the gating variables) and the component of open channel fluctuations attributed to the gate multiplicity. This nontrivial phenomenon was found to be playing a major augmentative role for the elevation of excitability and spontaneous firing in small cells. In addition, the same phenomenon was found to be enhancing spike coherence significantly. Here we extend Fox and Lu's ( 1994 ) stochastic Hodgkin-Huxley equations by incorporating colored noise terms into the conductances there to obtain a formalism capable of capturing the addressed cross-correlations. Statistics of spike generation, spike coherence, firing efficiency, latency, and jitter from the articulated set of equations are found to be highly accurate in comparison with the corresponding statistics from the exact microscopic Markov simulations. This way, it is demonstrated vividly that our formulation overcomes the inherent inadequacy of the Fox and Lu equations. Finally, a recently proposed diffusion approximation method (Linaro, Storace, & Giugliano, 2011 ) is taken into consideration, and a discussion on its character is pursued.

Amirabi Z.,Eastern Mediterranean University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

We revisit the spherically symmetric third order Lovelock black hole solution in seven dimensions. We show that the general solution for the metric function does not admit the Gauss-Bonnet (GB) limit. This is not expected due to the linear superposition of the second (GB) and third order Lovelock Lagrangians in the general action. It is found that the two branches of the GB solutions are indeed the limit of the other two complex solutions of the field equations in the third order Lovelock gravity. These two complex solutions could not be accepted as the solutions of Einstein's field equations which are supposed to be real value functions on the entire real r axis. A new solution, which is valid only if the third order Lovelock parameter is small, is introduced which can be considered as the natural extension of general relativity to the third order Lovelock modified theory of gravity. We also generalize the discussion to the higher dimensional third order Lovelock gravity coupled to matter sources with a cosmological constant. © 2013 American Physical Society.

Komurcugil H.,Eastern Mediterranean University
ISA Transactions | Year: 2012

This paper presents an adaptive terminal sliding mode control (ATSMC) strategy for DC-DC buck converters. The idea behind this strategy is to use the terminal sliding mode control (TSMC) approach to assure finite time convergence of the output voltage error to the equilibrium point and integrate an adaptive law to the TSMC strategy so as to achieve a dynamic sliding line during the load variations. In addition, the influence of the controller parameters on the performance of closed-loop system is investigated. It is observed that the start up response of the output voltage becomes faster with increasing value of the fractional power used in the sliding function. On the other hand, the transient response of the output voltage, caused by the step change in the load, becomes faster with decreasing the value of the fractional power. Therefore, the value of fractional power is to be chosen to make a compromise between start up and transient responses of the converter. Performance of the proposed ATSMC strategy has been tested through computer simulations and experiments. The simulation results of the proposed ATSMC strategy are compared with the conventional SMC and TSMC strategies. It is shown that the ATSMC exhibits a considerable improvement in terms of a faster output voltage response during load changes. © 2012 ISA.

Komurcugil H.,Eastern Mediterranean University
IEEE Transactions on Industrial Electronics | Year: 2012

A new method to the sliding-mode control of single-phase uninterruptible-power-supply inverters is introduced. The main idea behind this new method is to utilize a time-varying slope in the sliding surface function. It is shown that the sliding line with the time-varying slope can be rotated in the phase plane in such a direction that the tracking time of the output voltage is improved during load variations. The adjustment of the time-varying slope is achieved dynamically by employing a simple function which involves the error variables of the system. This function is obtained from the input/output relationship of the single-input fuzzy logic controller operating on the error variables. When a newly computed slope value is applied to the system, the position of the representative point is changed so as to achieve the desired response. The performance of the proposed control method has been tested through computer simulations and experiments using a triac-controlled resistive load and a diode bridge rectifier load. The results of the proposed method are compared with a classical sliding mode controller and a standard controller. It has been shown that the proposed method is capable of shortening the tracking and sliding times, resulting in a smaller total harmonic distortion in the output voltage. © 2012 IEEE.

Atikol U.,Eastern Mediterranean University
Energy | Year: 2013

In many developing countries due to lack of infrastructure the utilities experience difficulties in monitoring their customers' demand or time of use of electricity and hence it is very difficult to apply DSM (demand-side management) programs for peak shifting. In several of these countries the residential EWHs (electric water heaters) are usually responsible for the evening peak. The general attitude of people is to turn them on just before they need hot water and statistics have shown that this takes place in the evening hours constituting the evening peak. The present work reviews the experimental findings about the static and dynamic cooling behavior of hot water in storage tanks and discusses the possible timer programs to avoid the peak hours. It is deduced from the experiments that even when the hot water is kept standing in a tank for 12h after the initial withdrawal of 64.2L, it would be possible to have warm water at temperatures above 40°C in the top 15% of the tank to utilize. If the DSM programs are carefully designed it would be possible to set the timers to operate the EWHs for once or twice a day to meet the daily demand of households. © 2013 Elsevier Ltd.

Mazharimousavi S.H.,Eastern Mediterranean University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

Recently Costa Filho have introduced a position-dependent infinitesimal translation operator which corresponds to a position-dependent linear momentum and consequently to a quantum particle with position-dependent effective mass. Although there is no doubt about the novelty of the idea and the formalism, we believe that some aspects of the quantum mechanics in their original work could be enhanced. Here in this Brief Report first we address those points and then an alternative is introduced. Finally we apply the formalism for a quantum particle under a null potential confined in a square well, and the results are compared with those in the paper mentioned above. © 2012 American Physical Society.

Katircioglu S.T.,Eastern Mediterranean University
Energy | Year: 2014

This study estimates higher education-induced energy consumption in the case of the TRNC (Turkish Republic of Northern Cyprus). Although the TRNC is a non-recognized state and a small island; it attracts many international students each year and has shown tremendous development in higher education since the 1990s. The results of the present study reveal that higher education development has an ongoing relationship with electricity consumption; electricity consumption reacts to its long-term equilibrium level by 80.95% as a result of higher education development. Finally, the results of the present study reveal that higher education development in Northern Cyprus exerts a positive and significant growth impact not only on electricity consumption but also on overall oil consumption, both in the short- and long-term; therefore, it can be inferred that higher education development in this small and non-recognized island state is a catalyst for the growth of energy consumption. © 2013 Elsevier Ltd.

Katircioglu S.T.,Eastern Mediterranean University
Renewable and Sustainable Energy Reviews | Year: 2014

This study investigates the long-run equilibrium relationship between tourism, energy consumption, and environmental degradation as proxied by carbon dioxide (CO2) emissions in Turkey, which attracts more than 30 million tourists per year, making it the sixth most visited country in the world. The study results reveal that tourism and energy consumption are in a long-term equilibrium relationship with CO2 emissions; in the tourism-induced model, CO2 emissions converge to the long-term equilibrium path by a 91.01 percent speed of adjustment every year through the channels of tourism, energy consumption, and aggregate income. Further, the results of the impulse response and variance decompositions reveal that the reaction of energy consumption, and therefore CO2 emissions, to changes in tourism development is positive and gains strength in the longer periods. This implies that tourism development in Turkey has resulted not only in considerable increases in energy use but also considerable increases in climate change, as demonstrated by the econometric analysis of this study. © 2014 Elsevier Ltd.

Komurcugil H.,Eastern Mediterranean University
IEEE Transactions on Industrial Electronics | Year: 2010

This paper proposes a passivity-based control (PBC) strategy for single-phase pulsewidth-modulated current-source inverters feeding a resistive load. In this strategy, it is required to estimate the load resistance and the inductor-current reference. However, the estimation accuracy depends on the inductance value when the load resistance and the inductor-current reference are estimated using an existing adaptive algorithm. In this paper, it is shown that the inductor-current reference estimation is possible at the expense of a constant reference function for the inductor current. In addition, the design of inductor and the sensitivity of the output voltage to the value of output capacitor used in the controller are studied extensively through the steady-state analysis of the proposed PBC. It is also shown that even very large values of the estimation error do not give rise to significant change in the output-voltage amplitude. Computer simulations and experiments are presented to verify the theoretical considerations. © 2006 IEEE.

Komurcugil H.,Eastern Mediterranean University
Control Engineering Practice | Year: 2013

This paper presents a non-singular terminal sliding mode control (NTSMC) method for DC-DC buck converters. The NTSMC method eliminates the singularity problem which arises in the terminal sliding mode due to the fractional power and assures the finite time convergence of the output voltage error to the equilibrium point during the load changes. It is shown that the NTSMC method has the same finite time convergence as that of the terminal sliding mode control (TSMC) method. The influence of the fractional power on the state trajectory of the converter is investigated. It is observed that the slope of the sliding line becomes larger with decreasing value of the fractional power which leads to a faster transient response of the output voltage during the load changes. The theoretical considerations have been verified both by numerical simulations and experimental measurements from a laboratory prototype. © 2012 Elsevier Ltd.

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