Yazarlar
- Korunur, Murat(3)
- Salti, Mustafa(2)
- Unal, Inan(2)
- Acikgoz, Irfan(1)
- Alatas, Bilal(1)
- Askin, M.(1)
- Askin, Muzaffer(1)
- Aydogdu, O.(1)
- Aydogdu, Oktay(1)
- Baskonus, H.M.(1)
- Binbay, Figen(1)
- Can, Umit(1)
- Gómez-Aguilar, J.F.(1)
- Kiziloluk, Soner(1)
- Ozer, Ahmet Bedri(1)
- Pirinccioglu, Nurettin(1)
- Salti, M.(1)
- Turgut Vanli, Aysel(1)
- Vanli, Aysel Turgut(1)
- Yildirim, Ozal(1)
Yayınlar
- MakaleYalnız künye2019Scopus SJRQ2Tsallis holographic dark energy in Bianchi type-III spacetime with scalar fields
Korunur, Murat
In this paper, we study one of the new dark energy models named Tsallis holographic dark energy (THDE) model considering the Bianchi type-III spacetime model. Considering deceleration parameter, transition from deceleration to acceleration phase happens at z = 0.256. The equation of state (EoS) parameter has been found using the Granda-Oliveros (GO) scale. It is found that for > 2 values, EoS parameter behaves like the quintessence era; for < 2, EoS parameter behaves like the phantom dark energy and approaches CDM model at late-time cosmic acceleration phase. Also, we reconstructed a correspondence between THDE model and some well-known scalar fields, such as tachyon, quintessence and K-essence. In addition, we evaluated equation of state parameter, kinetic energy and scalar potential versus time.
AtıfScopus28WoS28OpenAlex29
İncele - MakaleYalnız künye2019Scopus SJRQ2Polytropic Carnot heat engine
Askin, M.; Salti, M.; Aydogdu, O.
Recent astrophysical datasets have implied that the universe has entered a speedy expansion phase. The Polytropic gas model, which describes a unified formulation of dark contents (matter plus energy), is one of the most reasonable definitions of this mysterious phenomenon. This interesting formulation allows to simulate the dark contents in the cosmic form of the perfect fluid and gives an interesting point of view in the discussion of fundamental theories of physics. In the first step of our investigation, we discuss the thermal equation-of-state (EoS henceforth) and obtain the EoS and deceleration parameters as explicit functions of temperature. Subsequently, we obtain a relation for the thermal efficiency of the Carnot heat engine which depends on free parameters given in the cosmological Polytropic gas description and the limits of maximal and minimal temperatures imposed on the Carnot cycle.
AtıfScopus8WoS8OpenAlex9İncele - MakaleYalnız künye2019Scopus SJRQ3New singular soliton solutions to the longitudinal wave equation in a magneto-electro-elastic circular rod with M-derivative
Baskonus, H.M.; Gómez-Aguilar, J.F.
In this paper, using the Bernoulli sub-equation function method, we obtain new dark, complex and singular soliton solutions for the longitudinal wave equation in a magneto-electro-elastic circular rod with M-derivative. Many new complex singular soliton solutions are successfully extracted. For better understanding of physical meanings, we plotted 2D and 3D graphs along with contour simulations.
AtıfScopus57WoS54OpenAlex63İncele - MakaleYalnız künye2019Scopus SJRQ4ECG BEAT DETECTION and CLASSIFICATION SYSTEM USING WAVELET TRANSFORM and ONLINE SEQUENTIAL ELM
Yildirim, Ozal
Electrocardiogram (ECG) signals consist of data containing measurements of electrical activity in the heartbeats. These signals include relevant information used to detect abnormalities such as arrhythmia. In this study, a recognition system is proposed for detection and classification of heartbeats in ECG signals. Heartbeats in the ECG data were detected by using the wavelet transform (WT) method and these beats are segmented with determined periods. For obtaining distinctive features from the beats, multi-resolution WT is applied to these segmented signals, and wavelet coefficients are obtained from different frequency levels. Feature vectors are generated on these coefficients by using various statistical methods. The proposed recognition system is trained on feature vectors by using the Online Sequential Extreme Learning Machine (OSELM) classifier during the learning phase to automatically recognize the signals. Five different beat types were obtained from the MIT-BIH arrhythmia dataset. The multi-class dataset that includes five classes and the binary-class dataset that includes two classes were created among these beat types. Performance tests of the proposed wavelet-based-OSELM (W-OSELM) method were realized with these two datasets. The proposed recognition system provided 97.29% correct beat detection rate from raw ECG signals. The classification accuracy is 99.44% for the binary-class dataset and 98.51% for the multi-class dataset. Furthermore, the proposed classifier has shown very fast recognition performance on ECG signals.
AtıfScopus25WoS17OpenAlex26İncele - MakaleYalnız künye2018Scopus SJRQ1F(T, R) theory of gravity
Salti, Mustafa; Korunur, Murat; Acikgoz, Irfan; Pirinccioglu, Nurettin; Binbay, Figen
We mainly focus on the idea that the dynamics of the whole universe may be understood by making use of torsion T and curvature R at the same time. The f(T,R)-gravity can be considered as a fundamental gravitational theory describing the evolution of the universe. The model can produce the unification of the general relativity (GR), teleparallel gravity (TPG), f(R)-gravity and f(T)-gravity theories. For this purpose, the corresponding Lagrangian density is written in terms of an arbitrary function of the torsion and curvature scalars. Furthermore, we use the absence/existence puzzle of relativistic neutron stars and thermodynamical laws as constraining tools for the new proposal.
AtıfScopus15WoS16OpenAlex17İncele - MakaleYalnız künye2018Scopus SJRQ3H-curvature tensors on IK-normal complex contact metric manifolds
Turgut Vanli, Aysel; Unal, Inan
IK-normal complex contact metric manifolds have some important properties. There are several applications of this kind of contact manifolds in theoretical physics. In this paper, we studied on H-curvature tensors for IK-normal complex contact metric manifolds. We have shown that there is no IK-normal complex contact metric manifold with constant sectional curvature and an IK-normal complex contact metric manifold is not Ricci semi-symmetric.
AtıfScopus4WoS2OpenAlex3İncele - MakaleYalnız künye2018Scopus SJRQ3Holographic reconstruction of scalar fields in extended Kaluza Klein cosmology
Korunur, Murat
In recent years, many studies have been conducted to reconstruct the physical properties of scalar fields by establishing a connection between some energy densities and a scalar field of dark energies. In this paper, using the extended five-dimensional (5D) Kaluza- Klein model, we establish a correspondence among modified holographic dark energy and the tachyon, K-essence and dilaton scalar-field models. We also graphically illustrate the evolution of the equation-of-state parameter versus time.
AtıfScopus7WoS7OpenAlex7İncele - MakaleAçık Erişim2017Scopus SJRQ3Automatic Mining of Quantitative Association Rules with Gravitational Search Algorithm
Can, Umit; Alatas, Bilal
The classical optimization algorithms are not efficient in solving complex search and optimization problems. Thus, some heuristic optimization algorithms have been proposed. In this paper, exploration of association rules within numerical databases with Gravitational Search Algorithm (GSA) has been firstly performed. GSA has been designed as search method for quantitative association rules from the databases which can be regarded as search space. Furthermore, determining the minimum values of confidence and support for every database which is a hard job has been eliminated by GSA. Apart from this, the fitness function used for GSA is very flexible. According to the interested problem, some parameters can be removed from or added to the fitness function. The range values of the attributes have been automatically adjusted during the time of mining of the rules. That is why there is not any requirements for the pre-processing of the data. Attributes interaction problem has also been eliminated with the designed GSA. GSA has been tested with four real databases and promising results have been obtained. GSA seems an effective search method for complex numerical sequential patterns mining, numerical classification rules mining, and clustering rules mining tasks of data mining.
AtıfScopus27WoS18OpenAlex28İncele - MakaleYalnız künye2017Scopus SJRQ2Cosmology via thermodynamics of polytropic gas
Askin, Muzaffer; Salti, Mustafa; Aydogdu, Oktay
We study cosmological scenarios of the polytropic gas (PG) dark matter-energy proposal in a Friedmann-Robertson-Walker (FRW) Universe. As a first step, we obtain an exact expression for the energy density of PG model by making use of the thermodynamics. Later, we investigate some cosmological quantities and perform neo-classical analyzes. Finally, we implement a connection between the PG and a homogenous minimally coupled scalar field by introducing its self-interacting potential.
AtıfScopus10WoS10OpenAlex13İncele - MakaleAçık Erişim2017Scopus SJRQ3Web Pages Classification with Parliamentary Optimization Algorithm
Kiziloluk, Soner; Ozer, Ahmet Bedri
In recent years, data on the Internet has grown exponentially, attaining enormous dimensions. This situation makes it difficult to obtain useful information from such data. Web mining is the process of using data mining techniques such as association rules, classification, clustering, and statistics to discover and extract information from Web documents. Optimization algorithms play an important role in such techniques. In this work, the parliamentary optimization algorithm (POA), which is one of the latest social-based metaheuristic algorithms, has been adopted for Web page classification. Two different data sets (Course and Student) were selected for experimental evaluation, and HTML tags were used as features. The data sets were tested using different classification algorithms implemented in WEKA, and the results were compared with those of the POA. The POA was found to yield promising results compared to the other algorithms. This study is the first to propose the POA for effective Web page classification.
AtıfScopus11WoS9OpenAlex10İncele - MakaleYalnız künye2017Scopus SJRQ2Conformal, concircular, quasi-conformal and conharmonic flatness on normal complex contact metric manifolds
Vanli, Aysel Turgut; Unal, Inan
Conformal, concircular, quasi-conformal and conharmonic curvature tensors play an important role in Riemannian geometry. In this paper, we study on normal complex contact metric manifolds under flatness conditions of these tensors.
AtıfScopus12WoS13OpenAlex19İncele - DergiInternational Journal of Software Engineering and Knowledge Engineering
- DergiInternational Journal of Modern Physics D
- DergiModern Physics Letters B
- DergiJournal of Mechanics in Medicine and Biology
- DergiInternational Journal of Geometric Methods in Modern Physics