Graduate School of Applied Mathematics, Article

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Modal analysis of elastic vibrations of incompressible materials using a pressure-stabilized finite element method Codina, Ramon; Türk, Önder (2022-09-01) This paper describes a modal analysis technique to approximate the vibrations of incompressible elastic solids using a stabilized finite element method to approximate the associated eigenvalue problem. It is explained why ...
Stochastic discontinuous Galerkin methods with low–rank solvers for convection diffusion equations Çiloğlu, Pelin; Yücel, Hamdullah (2022-02-01) We investigate numerical behaviour of a convection diffusion equation with random coefficients by approximating statistical moments of the solution. Stochastic Galerkin approach, turning the original stochastic problem to ...
The Impact of Large Investors on the Portfolio Optimization of Single-Family Houses in Housing Markets Yılmaz, Bilgi; Korn, Ralf; Kestel, Sevtap Ayşe (2022-02-01) As a consequence of the real estate market crash after 2008, large investors invested a significant amount of wealth into single-family houses to construct a portfolio of rental dwellings, whose income is securitized in th...
Optimal Premium allocation understop-loss insurance using exposure curves Mert, Özenç Murat; Kestel, Sevtap Ayşe (2022-01-01) Determining the retention level in the stop-loss insurance risk premium for both insurerand reinsurer is an important factor in pricing. This paper aims to set optimal reinsurancewith respect to the joint behavior of the i...
Default and prepayment options pricing and default probability valuation under VG model Yilmaz, Bilgi; Hekimoglu, A. Alper; Kestel, Sevtap Ayşe (2022-01-01) In this paper, a new approach, the Variance Gamma (VG) model, which is used to capture unexpected shocks (e.g., Covid-19) in housing markets, is proposed to contribute to the standard option-based mortgage valuation method...
A novel model for sustainable waste collection arc routing problem: Pareto-based algorithms Tirkolaee, Erfan Babaee; Goli, Alireza; Gutmen, Selma; Weber, Gerhard Wilhelm; Szwedzka, Katarzyna (2022-01-01) Municipal solid waste (MSW) management is known as one of the most crucial activities in municipalities that requires large amounts of fixed/variable and investment costs. The operational processes of collection, transport...
Faster characteristic three polynomial multiplication and its application to NTRU Prime decapsulation Yeniaras, Esra; Cenk, Murat (2022-01-01) Efficient computation of polynomial multiplication over characteristic three fields is required for post-quantum cryptographic applications which gain importance upon the recent advances in quantum computers. In this paper...
The prediction power of machine learning on estimating the sepsis mortality in the intensive care unit Selcuk, Mehtap; Koç, Oğuz; Kestel, Sevtap Ayşe (2022-01-01) Background: The prediction of sepsis mortality of intensive care unit (ICU) observations using machine learning (ML) methods is hypothesized to yield better or as good as performance compared to the prognostic scores. This...
Robust optimization of risk-aware, resilient and sustainable closed-loop supply chain network design with Lagrange relaxation and fix-and-optimize Lotfi, Reza; Sheikhi, Zohre; Amra, Mohsen; AliBakhshi, Mehdi; Weber, Gerhard Wilhelm (2021-12-01) This study explores a Robust, Risk-aware, Resilient, and Sustainable Closed-Loop Supply Chain Network Design (3RSCLSCND) to tackle demand fluctuation like COVID-19 pandemic. A two-stage robust stochastic multiobjective pro...
Optimal premium allocation under stop-loss insurance using exposure curves Mert, Özenç Murat; Kestel, Sevtap Ayşe (2021-11-01) Determining the retention level in the stop-loss insurance risk premium for both insurer and reinsurer is an important factor in pricing. This paper aims to set optimal reinsurance with respect to the joint behavior of the...
Viable medical waste chain network design by considering risk and robustness Lotfi, Reza; Kargar, Bahareh; Gharehbaghi, Alireza; Weber, Gerhard-Wilhelm (2021-10-01) Medical waste management (MWM) is an important and necessary problem in the COVID-19 situation for treatment staff. When the number of infectious patients grows up, the amount of MWMs increases day by day. We present medic...
Structure-preserving reduced-order modeling of Korteweg–de Vries equation Uzunca, Murat; Karasözen, Bülent; Yıldız, Süleyman (2021-10-01) Computationally efficient, structure-preserving reduced-order methods are developed for the Korteweg–de Vries (KdV) equations in Hamiltonian form. The semi-discretization in space by finite differences is based on the Hami...
An Introduction to the Special Issue on Numerical Techniques Meet with OR - Part II Gurbuz, Burcu; Weber, Gerhard-Wilhelm (2021-09-01) The special issue: "Numerical Techniques Meet with OR" of the Foundations of Computing and Decision Sciences consists of two parts which are of the main theme of numerical techniques and their applications in multi-discipl...
Time varying control of magnetohydrodynamic duct flow Evcin, Cansu; Uğur, Ömür; Tezer, Münevver (2021-09-01) Optimal control of the unsteady, laminar, fully developed flow of a viscous, incompressible and electrically conducting fluid is considered under the effect of a time varying magnetic field B0(t) applied in the direction m...
Preface: Special Issue on Modeling, Simulation, and Optimization in Operational Research Weber, Gerhard-Wilhelm; Thomas, J. Joshua; Saucedo, Jose Antonio Marmolejo; Fiore, Ugo; Litvinchev, Igor; Vasant, Pandian (2021-09-01)
Gradient-based grey wolf optimizer with Gaussian walk: Application in modelling and prediction of the COVID-19 pandemic Khalilpourazari, Soheyl; Hashemi Doulabi, Hossein; Özyüksel Çiftçioğlu, Aybike; Weber, Gerhard-Wilhelm (2021-09-01) This research proposes a new type of Grey Wolf optimizer named Gradient-based Grey Wolf Optimizer (GGWO). Using gradient information, we accelerated the convergence of the algorithm that enables us to solve well-known comp...
The Impact of Macro-Economic Drivers in Housing Markets: The US Cas Yılmaz, Bilgi; Yerlikaya Özkurt, Fatma; Kestel, Sevtap Ayşe (2021-08-01) This paper analyzes the effect of macro-economic, financial and commodity market indicators on housing markets. We compare the efficiency of the models generated by Generalized Linear Models (GLM) and Multivariate Adaptive...
Reduced order modelling of nonlinear cross-diffusion systems Karasözen, Bülent; Uzunca, Murat; Yıldız, Süleyman (2021-07-15) In this work, we present reduced-order models (ROMs) for a nonlinear cross-diffusion problem from population dynamics, the Shigesada-Kawasaki-Teramoto (SKT) equation with Lotka-Volterra kinetics. The formation of the patte...
On building two-player games with treatment schedules for the sir model Hamidoğlu, Ali; Taghiyev, Mustafa H.; Weber, Gerhard W. (2021-07-01) © 2010 AZJM All rights reserved.In this study, a treatment argument is provided as a discrete two-player game related to an epidemiological dynamics, so-called, Susceptible-Infectious-Recovered (SIR) model. Here, a simple ...
Back-Ordered Inventory Model With Inflation in A Cloudy-Fuzzy Environment Barman, Haripriya; Pervin, Magfura; Roy, Sankar Kumar; Weber, Gerhard Wilhelm (2021-07-01) In this paper, an Economic Production Quantity model for deteriorating items with time-dependent demand and shortages including partially back-ordered is developed under a cloudy-fuzzy environment. At first, we develop a c...

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