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Publication Embargo Survey on Access Control Mechanisms in Cloud Computing(River Publishers, 2018-05-26) AKBULUT, AKHAN; BAYDOĞMUŞ, GÖZDE KARATAŞ; 110942; 116056The benefits that Internet-based applications and services have given to the end user with today’s cloud computing technology are very remarkable. The distributed services instantly scaled over the Internet provided by cloud computing can be achieved by using some mechanisms in the background. It is a critical task for end users to control access to resources because lack of control often leads to security risks. In addition, this may cause systems to fail. This paper describes seven different access control mechanisms used in cloud computing platforms for different purposes. Besides, the advantages and disadvantages of various models developed from previous service-based architectures and used for cloud computing are detailed and classified. During the assessments, NIST’s metrics were taken as a reference, and in the study, 109 articles from the past decade were examined. We also compared our research with the existing survey papers.Publication Embargo Close-to-convex functions defined by fractional operator(2013) Aydoğan, Seher Melike; Kahramaner, Yasemin; POLATOĞLU, YAŞAR; 35549; 8366; 199370Let S denote the class of functions f(z) = z + a2z2 + ... analytic and univalent in the open unit disc D = {z ∈ CPublication Embargo Üniversiteler Açılırken(2015-09-11) Güzel, Erhan; 2127Publication Open Access The numerical solution of the singular two-point boundary value problems by using non-polynomial spline functions(2010) Çağlar, Hatice Nazan; Çağlar, Süleyman Hikmet; Dündar, Durmuş; Akkoyunlu, Canan; 110809; 114368; 113376The non-polynomial spline method is proposed to solve a singular boundary value problems. Some model problems are solved and the numerical results are compared with B-spline approximation and the exact solution. Results obtained by the method indicate the method is simple and effective.Publication Embargo Non-Polynomial Spline Method for a Time-Dependent Heat-Like Lane- Emden Equation(Polish Acad Sciences inst Physics, Al Lotnikow 32-46, Pl-02-668 Warsaw, Poland, 2012-01) Uçar, Mehmet Fatih; Çağlar, Süleyman Hikmet; 107148; 114368In this study, a time-dependent heat-like Lane-Emden equation is solved by using a non-polynomial spline method. An example is solved to assess the accuracy of the method. The numerical results are obtained for different values (n) of equation. The results indicate that non-polynomial spline method is effectively implemented. It is seen that results are compatible with exact solutions and consistent with other existing numerical methods.Publication Open Access Third-Degree B-spline solution for a nonlinear diffusion Fisher’xxs equation(2011) Çağlar, Hatice Nazan; Çağlar, Süleyman Hikmet; İşeri, Müge; 110809; 114368Non-linear Fisher’s equations are solved by using a spline method based on B-spline in the space direction and finite difference schema in the time direction. Numerical results reveal that spline method based on Bspline is implemented and effectivePublication Metadata only The Module Category of Leavitt and Cohn Leavitt Path algebras(2014) KOÇ, AYTEN; 112205Publication Open Access Stokastik Trendin Lokal Polinomal Yaklaşım ve Üstel Düzgünleştirme ile Bulunmasında Hata Kareleri Ortalamasının Karşılaştırılması(Marmara Üniversitesi, 2004) ÇAĞLAR, HATİCE NAZAN; ÇAĞLAR, SÜLEYMAN HİKMETÜstel düzgünleştirme modelleri stokastik trendin elde edilmesinde kullanılan en temel yöntemdir. Düzgünleştirme problemlerinde kullanılabilecek alternatif bir yöntemde Lokal Polinomal yaklaşımdır. Bizim çalışmamızda Lokal polinomlarda ağırlık fonksiyonu olarak Kernel fonksiyonları kullanılmıştır. Özellikle son yıllarda bu alanda yapılan bilimsel çalışmalarda Kernel fonksiyonları çok geniş yer tutmaktadır. Yapılan bu çalışmada Üstel düzgünleştirme ve Lokal Polinomal yaklaşım modelleri için hata kareleri ortalaması (HKO) karşılaştırılarak en uygun yöntem belirlenmeye çalışılmıştır. Bu amaçla stokastik trend Türkiye’deki altın fiyatları kullanılarak her iki yöntem için bulunmuş ve HKO lar hesaplanmıştır. Ayrıca üstel düzgünleştirmeyi sağlayan otlar için HKO lar araştırılmıştır.Publication Metadata only The numerical solution of partial differential equations with local polynomial regression(LPR)(EUDOXUS PRESS, LLC, 1424 BEAVER TRAIL DRIVE, CORDOVA, TN 38016 USA, 2009-10) Çağlar, Hikmet; Çağlar, Nazan; Çağal, Behiç; TR114368; TR110809In this paper, we extended the LPR method to solve the partial differential equations. Numerical experiments are presented to demonstrate the utility and the efficiency of the proposed computational procedure.Publication Embargo Üniversite (Universitas)(2015-07-10) Güzel, Erhan; 2127