Browsing Akademik Arşiv / Institutional Repository by Title

Okul öncesi eğitimi için etkili mekan tasarımı

Izadpanah, Shirin; Günçe, Kağan; Şekerci, Yaren (Pegem Yayınevi, 2019)

Today kindergartens are more than ever concerned about the integrating the requirements for children’ effective learning in designing the layout. Researches claim that preschoolers are in a constant learning and their ...

On an asymptotic-numerical hybrid method for solving singularly perturbed nonlinear delay differential equations

Cengizci, Süleyman; Kıroğlu, Ekrem (4th International Conference on Computational and Experimental Science and Engineering (ICCESEN-2017), 2017)

Modelling automatic systems often involves the idea of control because feedback is necessary in order to maintain a stable state. But much of this feedback require a finite time to sense information and react to it. A ...

On an efficient hybrid method for solving singularly perturbed difference-differential equations exhibiting turning layer behavior

Cengizci, Süleyman; Kıroğlu, Ekrem (4th International Conference on Computational and Experimental Science and Engineering (ICCESEN-2017), 2017)

Singularly perturbed differential equations that involve positive small perturbation parameter(s) 0<ɛ≪1 as the multiplier to the highest order derivative term are important concepts of mathematical and engineering sciences. ...

On conformal curves in 2-dimensional de sitter space

Şimşek, Hakan; Özdemir, Mustafa (Advances in Applied Clifford Algebras, 2016)

In this paper, we examine the pseudo-spherical curves, which are equivalent to each other under the conformal maps preserving a fixed point in the de Sitter 2-space, by using the Clifford algebra Cl 2,1. Also, we find the ...

On focal curves of null Cartan curves

Şimşek, Hakan (Turkish Journal of Mathematics, 2017)

The focal curve, which is determined as the locus of centers of osculating pseudo-spheres of a null Cartan curve, is investigated in Minkowski (n+2)-space Mn+2. Moreover, a curve called acceleration focal curve of a null ...

On the eigenvalues and eigenvectors of a lorentzian rotation matrix by using split quaternions

Özdemir, Mustafa; Erdoğdu, Melek; Şimşek, Hakan (Advances in Applied Clifford Algebras, 2014)

In this paper, we examine eigenvalue problem of a rotation matrix in Minkowski 3 space by using split quaternions. We express the eigenvalues and the eigenvectors of a rotation matrix in term of the coefficients of the ...

On the seismic collapse capacity of optimally designed steel braced frames

Gholizadeh, Saeed; Hassanzadeh, Aydin; Milany, Arman; Farrokh Ghatte, Hamid (Engineering with Computers, 2020)

The main purpose of this study is to respond to an important question in the field of structural engineering: is the seismic collapse capacity of optimally designed concentrically steel braced frames acceptable or not? The ...

One-dimensional finite element simulations for chemically reactive hypersonic flows

Cengizci, Süleyman (8th International Eurasian Conference on Mathematical Sciences and Applications (IECMSA-2019), 2019)

Hypersonic vehicles are utilized in recent years massively for both military and civilian purposes. As the vehicles fly through an atmosphere at hypersonic speeds (generally considered as Mach>), they experience critical ...

Operations management for double-ended queues

Talay, Işılay (Izmir Katip Celebi University Faculty of Economics and Administrative Sciences, 2019)

In this paper we have presented the double-ended queueing model with its generic form, abstract modeling extensions, different types of controls to be assumed by the management of the system, as well as optimization via ...

Optimal payment scheme selection in global supply chains

Talay, Işılay; Bayram, Orkun (EURO 2019 - Dublin Congress Board, 2019)

Cross-border payments are one of the main terms in an international trade contract, and blockchain technology started to challenge the traditional intermediary channels for making such payments, e. g. the SWIFT network. ...

Optimal payment scheme selection in global supply chains

Talay, Işılay; Bayram, Orkun (EURO 2019 - Dublin Congress Board, 2019)

Cross-border payments are one of the main terms in an international trade contract, and blockchain technology started to challenge the traditional intermediary channels for making such payments, e. g. the SWIFT network. ...

Optimal procurement and production planning for multi-product multi-stage production under yield uncertainty

Talay, Işılay; Özdemir Akyıldırım, Öznur (European Journal of Operational Research, 2019)

Many products with several types are produced in more than one production stage subject to various potential complications, yield uncertainty being a very costly one. This study investigates the input procurement and ...

Optimal staffing of specialized programme trainees under uncertainty

Özdemir Akyıldırım, Öznur; Talay Değirmenci, Işılay (Journal of the Operational Research Society, 2015)

We propose a stochastic model and provide an easy-to-implement optimization tool for admission decisions to specialized training programmes designed for service industries. The model can be applied for staffing of trainees ...

Optimization of hydrothermal synthesis of Ce3+ co-doped NaYF4, Yb3+, Er3+upconversion nanoparticles and investigation of their size, morphology, and phase transitions.

Demirel Topel, Seda (ICENS, 2019)

In this study, the synthesis of water-soluble polyethyleneimine (PEI) modified UCNPs which were prepared by a hydrothermal method have been reported. The resultant UCNPs were small size and hexagonal β-phase structure ...