Web of Science Indexed Publications
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Öğe Diffeomorphism invariance breaking in gravity and cosmological evolution(Springer, 2025) Aydemir, Ufuk; Elbistan, MahmutDiffeomorphism invariance breaking has been investigated in the literature in several contexts, including emergent General Relativity (GR). If GR emerges from an underlying theory without diffeomorphism invariance, there may be small violations of this symmetry at low energies. Since such small violations should not cause instabilities in cosmological evolution, it is a suitable framework for examining such symmetry-breaking effects. In this paper, the cosmological evolution with broken diffeomorphism invariance is investigated in the (modified) FLRW spacetime in the effective theory framework. The GR Lagrangian is augmented with all diffeomorphism-breaking but Lorentz-invariant terms in the leading order, namely, those involving two derivatives. The magnitudes of (minor) violations are kept general modulo the conditions arising in the linearized theory. The analytic solutions of the scale factor in the full non-linear theory for the single-component universes are attempted; the radiation and vacuum solutions are found analytically, whereas the matter solution is worked out numerically since an analytic solution does not exist in the required form. It is observed that the solutions smoothly connect to those of GR in the limit of vanishing symmetry-breaking. The more realistic, two-component, and three-component universes are numerically studied, and no signs of singular behavior are observed: minor diffeomorphism-violating modifications to GR at the level of two derivatives do not cause instabilities in the basic cosmological evolution.Öğe Trajectory Generation and Control for UAVs Using Quintic PH Curves and Kolmogorov-Arnold Networks (KANs)(Ieee, 2025) Ciftci, Fatma Senguler; Oniz, YesimThis paper presents a novel methodology that utilizes quintic Pythagorean-Hodograph (PH) curves for trajectory generation of unmanned aerial vehicles (UAVs) and Kolmogorov-Arnold Networks (KANs) for tracking problem. PH curves enable exact arc length computation and ensures smooth transitions in positions, velocities, and accelerations throughout the trajectory. The UAV's movements along the generated trajectory are regulated by KAN-based controllers. A separate controller is designed for each axis. We validate through simulations, indicating that a 40% improvement in tracking accuracy can be attained with KANs over conventional multilayer perceptrons (MLPs) under wind disturbances.Öğe Karachay-Balkar converb clauses(Harrassowitz Verlag, 2024) Gurer, AsliThis study investigates the internal and external syntax of {-(I)b) converb clauses in the Karachay-Balkar variety spoken in Konya, Turkey. It proposes that (i) converb clauses with {-(1)b) do not form a homogeneous group, (ii) the different and same-subject {-(I)b) con- verbs are not reduced and can include CP-level projections, (iii) the external syntax of the converbs differs, and converbs can attach at the CP, TP, or VP level, (iv) verb forms in {-(I)b), as predicates in finite clauses, express postterminality, and resultatives.Öğe Sincerity and the Ideal of the Authentic Self: Melville's Bartleby(Johns Hopkins Univ Press, 2025) Turner, Zeynep TalayThe figure of Bartleby has puzzled many thinkers. Interpretations vary, but the common point in many accounts is that Bartleby is beyond any conceptualization. In this paper I will ask whether he can nevertheless be understood in terms of the problem of authenticity. I will initially follow Lionel Trilling's famous argument, that is, the ethical ideal of the authentic self had replaced an earlier one he called sincerity, and that Bartleby, being an authentic figure, can be treated as an illustration of this. Then, I will take the discussion further by examining Bartleby via Giorgio Agamben's account of ethics.Öğe Cognitive Difficulties, Coping Strategies and Barriers to Participation in Cognitive Rehabilitation in People with Multiple Sclerosis: A Qualitative Study Across Different Disability Levels(Sage Publications Ltd, 2025) Karakas, Hilal; Yavas, Ipek; Gokcen, Rabia; Celik, Gozubatik; Cansiz, Melek; Ertekin, Ozge; Kahraman, Turhan[Abstract Not Available]Öğe Lower Urinary Tract Symptoms in Pregnant Women: The Silent Burden on Quality of Life(Springer London Ltd, 2025) Celebi, E. Z.; Cansizlar, Artug G.; Demirtas, Aslan F.; Aslan, E.[Abstract Not Available]Öğe P-O fit based on SDGs and willingness to work: A moderation model examining the regulatory focus(John Wiley & Sons Ltd, 2024) Senol, Aleyna B.; Cinar, Cemre; Czukor, Gergely[Abstract Not Available]Öğe Understanding the experiences of adult care-leavers from a resilience perspective(Taylor & Francis Ltd, 2025) Benli, Sezin; Gocek, Elif Akdag[Abstract Not Available]Öğe Transnational Indistinctions: Bir Zamanlar Anadolu'da/Once Upon a Time in Anatolia (2011) and Kis Uykusu/Winter Sleep (2014)(Edinburgh Univ Press, 2023) Diken, Ebru Thwaites[Abstract Not Available]Öğe Defining hybrid EMT states in carcinomas: molecular signatures and candidate molecules for EMT reversal(Wiley, 2025) Manto, K.; Taymaz-Nikerel, H.; Ulucan, O.[Abstract Not Available]Öğe An exploratory study of dialogic communication on mobile gaming company websites: The Turkish context(Scoala Natl Studii Politice Adm - Snspa, Fac Cominicare Realti Publice, 2025) Meric, Emre; Cakici, Zindan; Goncu, Barika; Dogan, SahikaDialogic communication remains an essential strategy for companies to build ways to interact with the relevant publics in the most effective and ethical approach. The current study aims to explore the dialogic communication potential of mobile gaming companies' websites via quantitative content analysis. The sample includes the websites of international mobile gaming companies that virtually communicate with their visitors in English as the primary language. The sample includes websites of mobile gaming companies producing the most popular games among Turkish gamers. Findings indicate that there is still room for such companies to increase their potential for dialogic communication with mobile gamers via their websites by increasing user interaction and enhancing user experience. Given the absence of research on dialogic communication strategies in mobile gaming company websites, this study provides foundational insights for both scholars and practitioners.Öğe Determinants of Tax Compliance: Ethical and Economic Values, Social Norms and Perception of Corruption(Maliye Bakanligi, 2025) Yelboga, Alim; Ozdemir, HakanUsing data from the World Values Survey (2017-2021), this study examines the impact of factors such as ethical values, social norms, and perceived corruption on tax compliance, employing an ordered logistic regression analysis. The findings indicate that individuals' ethical values are the strongest determinant of tax compliance, whereas perceived corruption has a statistically significant but comparatively weaker effect. While a significant portion of the findings are consistent with existing literature, the study's clearer demonstration of the relative impact of ethical values compared to other factors constitutes a complementary contribution to the literature. Overall, the results confirm that tax compliance is shaped not only by economic incentives but also by individuals' values and perceptions. The findings demonstrate the importance of strengthening ethical values and social trust in enhancing voluntary tax compliance.Öğe Endogenous and imported populism vs local citizenship in marginalised and remote places of Europe(Policy Press, 2025) Kaya, Ayhan; Krasteva, Anna; Membretti, Andrea[Abstract Not Available]Öğe Beyond binary: University student perceptions of online, hybrid and face-to-face learning, post-pandemic in Türkiye(Western Australian Inst Educational Research Inc, 2025) Aydin, Oya TamtekinBetween 2020 and 2024, higher education students experienced diverse instructional methods. The Covid-19 pandemic triggered a rapid transition to online education in 2020, which persisted in many regions until 2022. By then, universities largely returned to face-to-face instruction without consulting students' preferences. Although this was initially welcomed as normalcy, students who had experienced online education began questioning the necessity of daily campus attendance. This study, conducted in Istanbul, T & uuml;rkiye, explores whether students would have preferred changes in delivery modes if given a choice, their preferences for face-to-face, online, or hybrid education, and the factors shaping these views. A mixed-methods approach was employed, combining surveys and semi-structured interviews. Of 232 students invited, 195 completed the survey, and 37 participated in interviews. All procedures were voluntary and anonymous. Survey and interview results revealed conflicting opinions. Students emphasised the benefits of both online and face-to-face education, but often followed these with reservations, reflecting an internal dilemma. The frequent use of but in their statements illustrates their struggle to fully align with either model. Rather than rejecting traditional methods or fully embracing online alternatives, most favoured hybrid systems. Notably, students reframed work-life balance as education-life-work balance. Overall, the study signals a growing demand for adaptive teaching and offers insights for policymakers seeking to align higher education with contemporary needs.Öğe Fast Contiguous Somatic Hypermutations for Single-Objective Optimisation and Multi-Objective Optimisation Via Decomposition(Assoc Advancement Artificial Intelligence, 2025) Corus, Dogan; Oliveto, Pietro S.; Yazdani, DonyaSomatic Contiguous Hypermutations (CHM) are a popular variation operator used in artificial immune systems for optimisation tasks. Theoretical studies have shown that CHM operators can lead to considerable speed-ups in the expected optimisation time compared to the traditional standard bit mutation (SBM) operators used in evolutionary computation for both single-objective and multi-objective problems where it is advantageous to mutate large contiguous areas of the genotype representing the candidate solutions. These speed-ups can make the difference between polynomial and exponential runtimes, but come at the expense of the CHM operator being considerably slower than the SBM operator in easy hillclimbing phases of the optimisation process, when small areas of the genotype have to be mutated for progress to be made. In this paper we present a Fast CHM operator that is asymptotically just as fast as traditional SBM for hillclimbing yet maintains the efficacy of the standard CHM operator when large jumps in the search space are required to make progress efficiently. We demonstrate such efficacy on all applications where CHM has been previously studied in the literature.Öğe Energy Management System Strategy Evaluation for E-Vehicles Using Proportional Pythagorean Fuzzy AHP(Old City Publishing Inc, 2026) Otay, Irem; Sari, Irem Ucal; Tolga, A. Cagri; Cebi, Selcuk; Onar, Sezi Cevik; Oztaysi, BasarThe shift from conventional vehicles to electric vehicles (EVs) is essential for sustainability. Energy management strategies play a crucial role in this transition, as they affect battery performance, extend lifespan, and ensure cost-effectiveness. This study evaluates energy management system (EMS) strategies for EVs using the Proportional Pythagorean Fuzzy Analytical Hierarchy Process (PPF-AHP) to prioritize decision criteria. To achieve this, a decision model is constructed involving four main criteria-sustainability and resilience, cost efficiency, performance and reliability, and competitiveness-as well as sixteen sub-criteria. Then, pairwise evaluations from five experts are collected and aggregated leading to the prioritization of decision criteria. In order to show the robustness of the methodology, the PPF-AHP results are compared with Buckley's Fuzzy AHP and Decomposed Fuzzy AHP.Öğe The Derivation of System Parameters for a Ground Source Heat Pump (GSHP)(Int Journal Renewable Energy Research, 2025) Camdali, Unal; Tunc, Murat; Erdem, Mehmet Emre; Tuncel, Erhanwell known the widespread use of nonrenewable energy sources such as fossil fuels cause environmental problems. Ground source heat pumps (GSHP) are highly efficient renewable energy system used for heating and cooling where cool deep ground source is used for higher efficiency. In this study, a new simulation model has been developed and used for heat pumps for low global warming potential (GWP) refrigerants such as R134a and validated by the experimental data. Also, the system parameters of a GSHP are obtained theoretically for heating and cooling modes of a building, located in Bolu City, Turkey. For this purpose, non-linear equations are determined by considering GSHP models in relevant literatures for heating and cooling capacity of 1.4 and 2.2 kW respectively for a building having dimensions as 4.4 m x 2.2 m x 3.6 m. In this respect, COPs for heating and cooling are calculated and obtained results are depicted. An algorithm is generated to design the R134a refrigerant heat exchanger to maximize the efficiency.Öğe The investigation of fermented food consumption on gastrointestinal symptoms: a cross-sectional study in university students(Peerj Inc, 2025) Seven Avuk, Hande; Aydin, Oyku; Kocatepe, Neslihan; Sahin, Sude Melis; Akdogan, Irem; Cavus, EserBackground Fermented foods (FFs) are a valuable source of live microorganisms that can enhance human health, particularly gastrointestinal health, akin to probiotics. This study investigated the relationship between FFs consumption habits and gastrointestinal system findings in university students. Methods A cross-sectional anonymous survey included 546 university students, collecting data on sociodemographic characteristics, the Gastrointestinal Symptom Rating Scale (GSRS), and the Bristol Stool Form Scale (BSFS). FFs consumption habits were recorded using a food frequency questionnaire. Results Results showed that the average GSRS score was 33.66 +/- 16.89. According to the BSFS, 15% of students experienced constipation, 72.7% had moderate stool consistency, and 12.3% had diarrhea. Notably, kefir, vinegar, and sourdough bread were never consumed by 56.8%, 44.3%, and 41.9% of students, respectively. Significant differences were found between the frequency of yogurt, kefir, vinegar, cheese, pickle consumption, and gastrointestinal symptoms (p < 0.05). Students with normal stool consistency had fewer dyspepsia, abdominal pain, reflux symptoms, and overall gastrointestinal symptoms than those with constipation (p < 0.05). Conclusion The study concludes that FFs such as yogurt, cheese, pickles, and kefir may offer health benefits, reducing symptoms of reflux, dyspepsia, abdominal pain, and general gastrointestinal issues in young adults.Öğe INVESTIGATING THE DUAL QUATERNION EXTENSION OF THE DGC LEONARDO SEQUENCE(Honam Mathematical Soc, 2024) Yilmaz, Cigdemigdem zeynep; Sacli, Gulsum yelizIn this study, we introduce a new generalization of the Leonardo sequence, dual quaternions with the DGC Leonardo sequence coefficients, depending on the parameter p is an element of R. This generalization gives dual quaternions with the dual-complex Leonardo sequence for p = -1, dual quaternions with the hyper-dual Leonardo sequence for p = 0, and dual quaternions with the dual-hyperbolic Leonardo sequence for p = 1. The basic algebraic structures and some special characteristic relations are presented, as well as the Binet's formula, generating function, d'Ocagne's, Catalan's, Cassini's, and Tagiuri's identities.Öğe PLASMA COENZYME Q10 LEVELS OF INDIVIDUALS WITH NEWLY DIAGNOSED TYPE 2 DIABETES AND DIABETES INDIVIDUALS WITH ADVANCED MICROALBUMINURIA: A COMPARATIVE STUDY(Nobel Ilac, 2024) Yildirim, Osman; Demirel, Birsen; Guendogan, Erdal; Avuk, Hande SevenObjective: Diabetes is a chronic disease that causes the development of microalbuminuria. CoQ10 deficiency is common in people with type 2 diabetes. This study aims to evaluate whether coenzyme Q10 (CoQ10) levels are a risk factor for diabetes and microalbuminuria in newly diagnosed diabetes and advanced microalbuminuria. Material and Method: The study was conducted with patients who came to the internal medicine outpatient clinic. Plasma CoQ10 and malondialdehyde (MDA) values of 90 people in total, including 30 people in each group, newly diagnosed Type 2 diabetes (Group D), diabetes mellitus with microalbuminuria (Group M), and the control group (Group C) were examined. Results: There was no difference between plasma CoQ10 and MDA levels of newly diagnosed type 2 diabetes patients and those with microalbuminuria (p>0.05). There was a negative correlation between CoQ10 and fasting glucose and HbA1c in all groups (p<0.05). A positive correlation was observed between CoQ10 and MDA (p<0.05). CoQ10 level of the control group was found to be higher than Group D and M (p<0.05); the difference between Group M and Group D was not significant (p>0.05). As a result of regression analysis, increasing the CoQ10 value was found to have a protective effect on the risk of diabetes (95 %CI: p=0.005). Conclusion: This study showed that individuals with low blood sugar and HbA1c had high CoQ10 levels. We think that CoQ10 can be considered a risk factor for diabetes, and further studies examining total CoQ10 and ubiquinol/ ubiquinone ratio would be beneficial.
