Yazar "Akgüller, Ömer" için listeleme
-
THE ANALYSIS OF INTERLOCKING DIRECTORS VIA HYPERGRAPHS
Balcı, Mehmet Ali; Akgüller, Ömer (Isik University, 2021)Since the dawn of the modern era, the associations that link companies together in the gathering and control networks have been interconnected. At the level of corporate governance, companies are linked by common stock ... -
Coarse Graining on Financial Correlation Networks
Balcı, Mehmet Ali; Batrancea, Larissa M.; Akgüller, Ömer; Nichita, Anca (MDPI, 2022)Community structure detection is an important and valuable task in financial network studies as it forms the basis of many statistical applications such as prediction, risk analysis, and recommendation. Financial networks ... -
Correlatıons between Network Vulnerabılıty And Laplacıan Energıes
Balcı, Mehmet Ali; Akgüller, Ömer; Kol, Erva (2019)In the network analysis, vulnerability plays key role. Similarly, Laplacian matrices are also effective tools in network analysis. In this study, we examine correlations between those two concepts. We first calculate the ... -
Curvature of curves parameterized by a time scale
Atmaca, Sibel Paşalı; Akgüller, Ömer (Pushpa Publishing House, 2015)Curvature is a fundamental characteristic of curves in differential geometry, as well as in discrete geometry. In this paper we present time scales analogy of the curvature defined by the concept of symmetric derivative ... -
Development of an optimum proliferation medium via the graph kernel statistical analysis method for genetically stable in vitro propagation of endemic Thymus cilicicus (Turkey)
Kaya, Ergun; Akgüller, Ömer; Mercan, Taner; Güldağ, Sevinç; Özkaya, Damla Ekin; Öztürk, Bilge; Çelik, Onur; Aktay, İrem (Department of Biology, Faculty of Science, University of Zagreb, 2021)Thymus cilicicus is an endemic Eastern Mediterranean element that has aromatic-medicinal properties. Its natural population spreads across gravelly ground and open rocky areas of South and Southwest Anatolia. The current ... -
Discrete Geodesic Distribution-Based Graph Kernel for 3D Point Clouds
Balcı, Mehmet Ali; Akgüller, Ömer; Batrancea, Larissa M.; Gaban, Lucian (MDPI, 2023)In the structural analysis of discrete geometric data, graph kernels have a great track record of performance. Using graph kernel functions provides two significant advantages. First, a graph kernel is capable of preserving ... -
Discrete Normal Vector Field Approximation via Time Scale Calculus
Akgüller, Ömer; Paşalı Atmaca, Sibel (Walter de Gruyter GmbH, 2020)The theory of time scales calculus have long been a subject to many researchers from different disciplines. Beside the unification and the extension aspects of the theory, it emerge as a powerful tool for mimetic discretization ... -
Discrete Ricci curvature-based statistics for soft sets
Akgüller, Ömer (Springer, 2020)Soft sets are efficient mathematical structures to model systems in multiple relations. Since a soft set is basically set system, it is possible to endow them with a proper distance function to obtain a metric space. By ... -
Empirical investigation on how wellbeing-related infrastructure shapes economic growth: Evidence from the European Union regions
Batrancea, Larissa M.; Nichita, Anca; Balcı, Mehmet Ali; Akgüller, Ömer (PMC, 2023)One of the most important policies of the European Union is regional development, which comprises measures of enhancing economic growth and citizens' living standards via strategic investment. Considering that economic ... -
Fractality of Borsa Istanbul during the COVID-19 Pandemic
Balcı, Mehmet Ali; Batrancea, Larissa M.; Akgüller, Ömer; Gaban , Lucian; Rus, Mircea-Iosif (MDPI, 2022)Forecasting price changes is very important for the process of estimating and managing market risk in financial markets. Price changes in financial markets may also depend on non-market factors. Considering this situation, ... -
Geodetic convex boundary curvatures of the communities in stock market networks
Akgüller, Ömer; Balcı, Mehmet Ali (Elsevier Science Bv, 2018)We analyze the daily returns of stock market indices of NASDAQ and S&P 500 over the period of 2004-2015. We build network models by using a threshold method that captures strong relations amongst the agents. We also subdivide ... -
Geometric Soft Sets
Akgüller, Ömer (2017)Soft sets are efficient tools to determine uncertainty in systems. In this study, we introduce a new concept called geometric soft sets to present and analyze the geometrical, topological, and structural properties of ... -
Hyperpath Centers
Balcı, Mehmet Ali; Paşalı Atmaca, Sibel; Akgüller, Ömer (Springer-Verlag Berlin, 2016)Path centers play an important role for several kinds of networks. In this study we present a novel approach to find a path center for a spatial data set modelled as a hypergraph. For this purpose, we first present a simple ... -
Jeodezi Dagılımı Temelli Graf Çekirdegi ve 3B Nokta Bulutu Uygulamaları
Akgüller, Ömer; Balcı, Mehmet Ali (EEEAG, 2022)Nokta bulutları, veri kümeleri için en temel çok yönlü temsillerden biridir. Nokta bulutlarının elde edilmesini saglayan kaynaklardan biri, birçok disiplinde de uygulamaları olan lazer menzil tarayıcıları gibi 3B sekil ... -
Mathematical Morphology on Soft Sets for Application to Metabolic Networks
Balcı, Mehmet Ali; Akgüller, Ömer (Springer-Verlag Berlin, 2015)In this paper, we introduce mathematical morphological operators such as dilation and erosion on soft sets. Rather than the common approach which is based on expressing soft set analogues of the classical theory, we use ... -
Network-Induced Soft Sets and Stock Market Applications
Balcı, Mehmet Ali; Batrancea, Larissa M.; Akgüller, Ömer (MDPI, 2022)The intricacy of the financial systems reflected in bilateral ties has piqued the interest of many specialists. In this research, we introduce network-induced soft sets, a novel mathematical model for studying the dynamics ... -
A New Topologıcal Measure for the Communıtıes of Stock Market Networks
Akgüller, Ömer; Öcal, Sinem; Balcı, Mehmet Ali (2017)Gıda ağları, bilimsel alıntılar, sosyal ağlar, haberleşme ağları, Internet ve borsa ağları gibi interaktif aktörleri içeren sistemler, karmaşık sistemlerin içeriği kapsamı altında pek çok araştırmacı tarafından incelenmiştir. ... -
Novel Graph Neighborhoods Emerging from Ideals
Çaksu Güler, Ayşegül; Balcı, Mehmet Ali; Batrancea, Larissa M.; Akgüller, Ömer; Gaban, Lucian (MDPI, 2023)Rough set theory is a mathematical approach that deals with the problems of uncertainty and ambiguity in knowledge. Neighborhood systems are the most effective instruments for researching rough set theory in general. ... -
Path-Based Visibility Graph Kernel and Application for the Borsa Istanbul Stock Network
Balcı, Mehmet Ali; Akgüller, Ömer; Batrancea, Larissa M.; Gaban, Lucian (MDPI, 2023)Using networks to analyze time series has become increasingly popular in recent years. Univariate and multivariate time series can be mapped to networks in order to examine both local and global behaviors. Visibility ... -
Poisson Bracket on Measure Chains and Emerging Poisson Manifold
Akgüller, Ömer (Centre Environment Social & Economic Research Publ-Ceser, 2018)We derive the Poisson manifolds emerging from the Hamiltonian systems defined on measure chains in the context of symmetric calculus of variations which encompass the discrete and continuous case. Precisely, we give a ...
