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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14411/18

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Recognition and Misclassification Patterns of Basic Emotional Facial Expressions: An Eye-Tracking Study in Young Healthy Adults
(MDPI, 2025) Alkan, Neşe; 01. Atılım University; 02. School of Arts and Sciences; Department of Psychology
Accurate recognition of basic facial emotions is well documented, yet the mechanisms of misclassification and their relation to gaze allocation remain under-reported. The present study utilized a within-subjects eye-tracking design to examine both accurate and inaccurate recognition of five basic emotions (anger, disgust, fear, happiness, and sadness) in healthy young adults. Fifty participants (twenty-four women) completed a forced-choice categorization task with 10 stimuli (female/male poser x emotion). A remote eye tracker (60 Hz) recorded fixations mapped to eyes, nose, and mouth areas of interest (AOIs). The analyses combined accuracy and decision-time statistics with heatmap comparisons of misclassified versus accurate trials within the same image. Overall accuracy was 87.8% (439/500). Misclassification patterns depended on the target emotion, but not on participant gender. Fear male was most often misclassified (typically as disgust), and sadness female was frequently labeled as fear or disgust; disgust was the most incorrectly attributed response. For accurate trials, decision time showed main effects of emotion (p < 0.001) and participant gender (p = 0.033): happiness was categorized fastest and anger slowest, and women responded faster overall, with particularly fast response times for sadness. The AOI results revealed strong main effects and an AOI x emotion interaction (p < 0.001): eyes received the most fixations, but fear drew relatively more mouth sampling and sadness more nose sampling. Crucially, heatmaps showed an upper-face bias (eye AOI) in inaccurate trials, whereas accurate trials retained eye sampling and added nose and mouth AOI coverage, which aligned with diagnostic cues. These findings indicate that the scanpath strategy, in addition to information availability, underpins success and failure in basic-emotion recognition, with implications for theory, targeted training, and affective technologies.
Recognition and Misclassification Patterns of Basic Emotional Facial Expressions: An Eye-Tracking Study in Young Healthy Adults
(MDPI, 2025-10-11) Alkan, Neşe; 01. Atılım University; 02. School of Arts and Sciences; Department of Psychology
GC Contents of the Genes May Imply Associations with Coronary Artery Disease, Autism, Obesity, and Type 2 Diabetes
(Wiley, 2025) Adiguzel, Y.; Yekeler, S. E.; Mohamed, A. A.; Turker, D.; Ozcan, L. E.; Sert, G.; Acet, K.; 01. Atılım University
Evaluating Pedicle and Vertebral Artery Relationship in Cervical Pedicle Screw Surgery Using DSA: Preliminary Report
(Wiley, 2025) Altinta, H. M.; Cingoz, G.; Koksal, A.; Demir, B. Tugtag; Bilecenoglu, B.; 01. Atılım University
Outcomes in Elderly Kidney Transplant Recipients: A National Multicentre Study
(Oxford Univ Press, 2025) Dheir, Hamad; Demir, Erol; Ozler, Tuba Elif; Cakir, Ulkem; Sinangil, Ayse; Caglayan, Feyza Bayrakdar; Turkmen, Aydin; 01. Atılım University
Is Preemptive Kidney Transplantation Beneficial in Elderly Kidney Recipients?: A Comparative, Multicentre National Study
(Oxford Univ Press, 2025) Dheir, Hamad; Demir, Erol; Cakir, Ulkem; Kocak, Huseyin; Celtik, Aygul; Sinangil, Ayse; Turkmen, Aydin; 01. Atılım University
Factors Affecting Dentists' Intention To Adopt Artificial Intelligence: An Extension of the Unified Theory of Acceptance and Use of Technology (UTAUT) Model
(Emerald Group Publishing Ltd, 2025) Alqaifi, Faten; Tengilimoglu, Dilaver; Business; 05. School of Business; 01. Atılım University
PurposeAdvancements in science and technology have integrated artificial intelligence (AI) into dentistry, improving treatment processes, operational efficiency, and clinical outcomes. However, AI adoption among dentists remains underexplored, hindering progress in oral healthcare. This study aims to identify key barriers to AI adoption and examine factors influencing dentists' intention to use AI.Design/methodology/approachA quantitative cross-sectional approach was employed, utilizing self-administered questionnaires distributed online and across various dental clinics and hospitals in Ankara, Turkey. A total of 440 dentists participated in the study. Data analysis was conducted using SPSS and SmartPLS.FindingsThe study found that AI-anxiety negatively affects the intention to adopt AI in dentistry, showing a medium (almost large) effect that is stronger than other UTAUT factors such as performance expectancy, effort expectancy, and social influence, which demonstrated only small effects. Dentists with higher anxiety about learning and sociotechnical blindness are less likely to adopt AI, while concerns about job replacement and AI-configuration have less but still significant impact.Research limitations/implicationsThese results contribute to the growing body of knowledge on technology adoption in oral healthcare and provide practical implications for technology developers, policymakers, and other stakeholders seeking to facilitate AI integration in dentistry.Originality/valueThis study provides novel insights into AI adoption in dentistry, offering guidance for future development and integration, and addressing a critical research gap in a growing field-particularly in Turkey, where implementation is still in its early stages.
Queer Lives in the Social Media Prism: Precarious LGBTQIA Plus Visibility and Lateral Surveillance in Azerbaijan
(Sage Publications Inc, 2025) Seyidov, Ilgar; Pentzold, Christian; Public Relations and Advertising; 05. School of Business; 01. Atılım University
In countries where state institutions and the public largely reject LGBTQIA+ identities and issues, queer people struggle with visibility. Next to governments and technology providers, what queer people do, who they connect to, and how they express themselves is being watched and scrutinized by their families and proximate relations. This lateral surveillance is afforded by social media that establish, as we argue in this article, a prism. Here, LGBTQIA+ lives become refracted as extensive though incoherent patterns of digital traces. How queer people respond to this situation where the binary of visible versus invisible falls apart is poorly understood. To address that gap, we interrogate the precarious management of visibility attempted by LGBTQIA+ people in Azerbaijan with its heteropatriarchal, honor-driven culture. Based on our exploratory interview study, we find that queer Azerbaijanis were confronted with a highly ambivalent scopic setup where context collision loomed large. In effect, they supported LGBTQIA+ visibility but had personally decided not to live or promote it. Yet whilst their attempts to remain opaque may contradict their activistic compliancy, this was a logical reaction to too hard to handle terms of visibility.
4D-Printed Continuous Fiber-Reinforced PLA/TPU Auxetic Composites: Mechanical Performance, Energy Absorption, Shape Recovery, and Reusability Evaluation
(SpringerNature, 2025) Alkan, Atakan; Ranjbar Aghjehkohal, Amin; Fallah, Ali; Koc, Bahattin; 01. Atılım University
This study explores the mechanical performance, energy absorption, shape recovery, and reusability of 4D-printed continuous carbon fiber-reinforced auxetic composite structures based on PLA/TPU blends, designed for load-bearing applications. PLA-TPU mixtures with different TPU content were developed to optimize the balance between flexibility and strength, with carbon fibers incorporated to enhance the mechanical properties of the resulting composites. Thermo-mechanical characterization of the blends was conducted, followed by a detailed evaluation of the structures' mechanical behavior and energy absorption capacity under room temperature conditions, simulating practical industrial scenarios. The shape recovery performance of these composite structures was also investigated. To assess reusability, the programming-recovery cycle was repeated five times, analyzing the retention of mechanical properties and shape recovery over multiple cycles to determine durability. Results revealed that TPU integration provided sufficient flexibility for cold programming, while carbon fiber reinforcement significantly enhanced stiffness and strength. The 4D-printed composites exhibited consistent shape recovery and maintained mechanical integrity after five cycles, confirming their reusability. These findings demonstrate the potential of 4D-printed PLA/TPU-based carbon fiber-reinforced composites as smart, durable materials for load-bearing applications in industries such as biomedical engineering, automotive, and aerospace.
PMMA-Based Electrospun Composite Fibers for Dye Adsorption From Water
(Sage Publications Ltd, 2025) Cakar, Ilknur; Yesil, Sertan; Bayram, Goknur; Chemical Engineering; 06. School Of Engineering; 01. Atılım University
Poly (methyl methacrylate) (PMMA) and PMMA/poly (ethylene glycol) (PEG)-based composite fibers were produced using electrospinning technique with two different additives; halloysite nanotubes (HNTs) and boron phosphate (BPO4). The effect of the additives on the morphology, wettability and dye adsorption properties of electrospun fibers were investigated by Scanning Electron Microscopy (SEM), water contact angle measurement and UV-VIS spectrophotometry. The results of SEM analysis indicated that addition of PEG resulted in thinner average fiber diameter and beaded structure. Additionally, it was also observed that incorporating both HNT and BPO4 to the PMMA solution caused increased fiber diameter which might be due to increased solution viscosity. For PMMA fibers containing 3 wt% HNT, the highest average diameter and water contact angle were measured as 2204 +/- 302 nm and 110.29 +/- 3.9 degrees, respectively. The produced fibers were tested for the capability to adsorb methylene blue (MB) and methyl orange (MO) from aqueous solutions. Dye adsorption capacity of the samples increased by addition of HNT and BPO4. According to adsorption capacity results, PMMA/PEG/BPO4 composite sample containing 5 wt% BPO4, with an adsorption capacity of 0.76 mg/g, was determined as adsorbent for kinetic and isotherm studies. The adsorption kinetics were well described by the pseudo-second-order model, and equilibrium data were correlated with the Langmuir model.
A Factory in a Time of Turmoil: The Establishment and Engineering of the Büyükdere Match Factory in 1930s Istanbul
(MDPI, 2025) Tunc, Gokhan; Tunc, Tanfer Emin; Civil Engineering; 06. School Of Engineering; 01. Atılım University
The Republic of Turkey established its first match factory in Sinop in 1929 but had to relocate it even before it was in operation due to severe structural damage caused by ground settlement. In July 1930, through his US-based firm the American-Turkish Investment Corporation (ATIC), the Swedish "Match King" Ivar Kreuger signed a contract with the Republic of Turkey to build and operate a factory in B & uuml;y & uuml;kdere, Istanbul. By 1930, Kreuger had already established a match production monopoly in nearly every country in Europe and that year created a similar financial system for Turkey, gaining control of match production for 25 years. This article explains the events surrounding the establishment of his modern production facility in Turkey, with a particular focus on its engineering aspects. It details the strategically chosen location, the engineering solutions for the factory's construction, its production lines, and what the country gained and lost from it. In order to determine the establishment and production processes of the facility, the authors examined domestic and foreign archival documents, firsthand news reports from the period, articles and theses, and all other available documents. After the contract was terminated by both parties, the Turkish government and ATIC, in May 1943, the factory continued its production and storage activities until May 1989. At that point, the factory and all its equipment were integrated into another existing facility in the & Idot;neg & ouml;l district of Bursa province. Almost all the buildings of the B & uuml;y & uuml;kdere Match Factory were demolished, and the land was repurposed for a 450-bed regional hospital in 2012. In short, this article deploys the B & uuml;y & uuml;kdere Match Factory as a case study to examine what Turkey gained and lost from the establishment and production processes of a modern industrial factory, enabled by US-Turkish collaboration, and equipped with the most advanced manufacturing and engineering technologies of the time.
Estimation of Parameters for a System Equipped with Protection Block
(Elsevier, 2026) Kus, Colkun; Eryilmaz, Serkan; Industrial Engineering; 06. School Of Engineering; 01. Atılım University
This paper studies the problem of estimating unknown parameters involved in a system which is equipped with a protection block. The system has different failure rates depending on whether the protection block is present or not, as the protection block is modeled by its own lifetime distribution and contributes an additional failure component to the system. The model is analyzed under the assumption of exponentially distributed lifetimes, leading to the study of its distributional properties and the estimation problem for its unknown parameters. Closed-form expressions for the maximum likelihood estimators are obtained. Furthermore, theoretical expectations and variances of the estimators are derived. We also discuss the stress-strength reliability estimation problem and construct confidence intervals for the associated reliability measure. Numerical results are provided to demonstrate the implementation of the proposed methods.
Transcatheter Aortic Valve Implantation in Nonagenarians: A Comparative Analysis of Baseline Characteristics and 1-Year Outcomes
(MDPI, 2025) Guney, Murat Can; Bozkurt, Engin; 01. Atılım University
Background: Transcatheter aortic valve implantation (TAVI) is increasingly used in elderly patients with severe aortic stenosis, yet data on nonagenarians remain limited. This study aimed to compare clinical characteristics and outcomes of patients aged >= 90 years with those aged <90 years undergoing TAVI. Methods: We retrospectively analyzed 620 patients who underwent transfemoral TAVI. Patients were divided into two groups: <90 years (n = 545) and >= 90 years (n = 75). Baseline clinical, procedural, and outcome data were compared. Results: Nonagenarians had lower body mass index (BMI) and a lower prevalence of comorbidities such as diabetes, hyperlipidemia, and prior coronary artery bypass grafting CABG (all p < 0.05). All-cause mortality was higher in nonagenarians at 1 month (8.0% vs. 5.5%, p = 0.425), 6 months (9.3% vs. 7.9%, p = 0.838), and 1 year (21.3% vs. 16.7%, p = 0.405), though these differences were not statistically significant. In-hospital stroke occurred more frequently in patients >= 90 years (6.7% vs. 2.2%, p = 0.044). Conclusions: Despite a higher rate of in-hospital stroke, nonagenarians undergoing TAVI had comparable mortality outcomes to younger patients. These findings support the feasibility of TAVI in selected very elderly patients, while highlighting the need for tailored stroke prevention strategies. Trial Registration: The trial is retrospectively registered, and a clinical trial number is not applicable.
Several Outcomes of Fixed-Point Theory in Interpolative Metric Spaces
(Univ Politecnica Valencia, Editorial UPV, 2025) Karapinar, Erdal; Kadioglu, Kaan; Turkmenel, Merve Gulcin; Aksoy, Umit; Mathematics; 02. School of Arts and Sciences; 01. Atılım University
This paper aims to generalize and improve the recent fixed-point theorems in the setting of interpolative metric spaces. More precisely, we investigate the existence and uniqueness of the fixed-point for certain operators of the Ciric-Reich-Rus-type, via admissible mapping in the context of interpolative metric spaces.
Workaholism and Sleep Disorders in Employees: The Moderator Roles of Workaholism in the Relationships Between Insomnia and Affective Symptoms
(Galenos Publ House, 2025) Nalbantoglu, Yagmur; Turkarslan, Kutlu Kagan; Department of Psychology; 02. School of Arts and Sciences; 01. Atılım University
Objective: Sleep disorders are a growing concern in occupational health due to their strong associations with emotional distress and impaired functioning. Employees with severe insomnia symptoms are at increased risk for affective symptoms such as anxiety and depression. However, this relationship may vary depending on work-related behavioral patterns. Workaholism, a compulsive drive to work excessively, may act as a moderator, intensifying the impact of sleep disturbances on affective symptoms and vice versa. This study aimed to assess sleep disorder risk among employees, examine differences in the severity of sleep disorders based on workaholism levels, and investigate the moderating roles of workaholism in the relationships between insomnia severity and affective symptoms. Materials and Methods: The sample consisted of 459 day-working employees (68.41% female, Mage =41.14, standard deviation =10.90) who completed measures of demographics, workaholism, and sleep disorders. Results: Results showed that 40.31% were at risk for at least one sleep disorder, and 28.98% for multiple. Compared to employees with lower workaholism, those with higher workaholism had significantly higher scores of breathing-related sleep disorder, insomnia, narcolepsy, restless legs/periodic limb movement disorder, and circadian rhythm sleep disorder. Moderation analysis revealed that workaholism significantly moderated the relationship between insomnia severity and affective symptoms, but not vice versa. As workaholism increased, the relationship between insomnia severity and affective symptoms became stronger. Conclusion: These findings suggest a high prevalence of sleep disorders among employees and that workaholism can exacerbate the affective burden of insomnia. Targeted interventions addressing both sleep health and workaholism may be critical for improving employee wellbeing.
A New Conservative Numerical Method for Strongly Coupled Nonlinear Schrödinger Equations
(Springer Heidelberg, 2025) Ors, Ridvan Fatih; Koroglu, Canan; Aydin, Ayhan; Mathematics; 02. School of Arts and Sciences; 01. Atılım University
In this paper, a numerical method based on the conservative finite difference scheme is constructed to numerically solve the strongly coupled nonlinear Schr & ouml;dinger (SCNLS) equation. Conservative properties such as energy and mass of the SCNLS equation have been proven. In particular a fourth-order central difference scheme is used to discretize the the spatial derivative and a second-order Crank-Nicolson type discretization is used to discretize the temporal derivative. It has been shown that the proposed scheme preserves the discrete mass and energy. The existence of discrete solution is also investigated. Several numerical results are given to demonstrate the preservation properties of the new method. Also, the effect of the linear coupling parameters on the evolution of solitary waves is investigated.
Microstructure-Based Prediction of Mechanical Properties of Austempered Ductile Iron Using Multiple Linear Regression Analysis
(Springer Int Publ AG, 2025) Yalcin, M. Alp; Davut, Kemal; Department of Metallurgical and Materials Engineering; 15. Graduate School of Natural and Applied Sciences; 01. Atılım University
Multiple linear regression analysis (MLRA) was used to predict the mechanical properties of austempered ductile iron (ADI) including yield and tensile strength, uniform elongation, hardening exponent, as well as fracture energy by building a model that uses characteristic features of microstructural constituents as input parameters. The complex multi-scale microstructure of ADI, which is composed of spherical graphite particles over 10 mu m diameter; and an ausferritic matrix with sub-micron sized features, makes it ideal for prediction of mechanical properties. For that purpose, low alloyed ductile iron samples austempered between 300 and 400 degrees C for 45-180 min were tensile tested, and also multi-scale microstructural characterization were carried out using optical microscope, SEM, and EBSD technique. Moreover, a sensitivity analysis was performed to determine which microstructural parameter(s) each mechanical property is most sensitive to. The results show that tensile and yield strength are most sensitive to size and morphology of matrix phases. Moreover, the size and aspect ratio of acicular ferrite correlate well with those of high-carbon austenite; since both form during transformation of parent austenite into ausferrite during austempering treatment. Equiaxed parent austenite grains transform into ausferrite with acicular morphology during the austempering treatment; and presence of equiaxed austenite grains in the austempered samples indicates untransformed regions during austempering treatment. Ductility was found to be more sensitive to nodularity of graphite particles, and this sensitivity was attributed to the size difference between graphite particles and grain size of matrix phases.
The Role of Evidence-Based Practice in the Field of Physiotherapy and Rehabilitation in Türkiye From the Perspectives of Students, Academics, and Clinicians: A Pilot Study
(Turkey Assoc Physiotherapists, 2025) Akinoglu, Bihter; Arikan, Zeynep; Benguboz, Fatma Busra; 01. Atılım University
Purpose: Evidence-based practice (EBP) isa method based on high-quality clinical research and practice. According to the World Confederation for Physical Therapy, EBP training should be at the forefront of physiotherapy practice recommendations. The aim of our study is to investigate the place of EBP and the barrier to it in the field of physiotherapy and rehabilitation in T & uuml;rkiye from the perspective of students, academicians and clinicians. Methods: The study was planned as a pilot study. The study was carried out with all students, academicians and clinicians in the field of physiotherapy and rehabilitation that could be reached during the study. In the evaluation, the "EBP Scale" consisting of 28 questions and a form prepared by the researchers questioning the opinions, knowledge level and obstacles to EBP were used. The study data were collected by creating a web-based form. Results: Our study was conducted with a total of 97 people, 44 students, 22 academicians and 31 clinicians. In the responses to the factors that prevent EBP, "Obtaining an order (doctor's instructions for treatment)" was stated as the first obstacle by 51.06%of students, 31.57%of academicians and 33.33% of clinicians. When the total EBP scale scores were compared between the three groups, statistically significant differences were found (p=0.000). Conclusion: When the results of our study were examined, it was seen that the knowledge and attitudes of physiotherapists in different fields regarding EBP varied, but in common, the main factor that made EBP difficult for students, clinicians and academicians in the field of physiotherapy and rehabilitation in T & uuml;rkiye was the "taking orders" factor.
The Impact of Quaternization Degree in Polyepichlorohydrin-Based Anion Exchange Membranes on Salinity Gradient Energy Generation by Reverse Electrodialysis
(Elsevier, 2025) Cihanoglu, Aydin; Guler, Enver; Kabay, Nalan; Chemical Engineering; 06. School Of Engineering; 01. Atılım University
Anion exchange membranes with tailored fixed-charge densities can improve monovalent ion selectivity and performance in reverse electrodialysis for salinity gradient power generation. In this study, poly(epichlorohydrin) was blended with polyacrylonitrile and quaternized with 1,4-diazabicyclo[2.2.2]octane at three different molar ratios to produce AEMs with systematically varied quaternization degrees via a one-step amination/ crosslinking procedure. The resulting membranes were characterized for their physicochemical, electrochemical, and RED performance using ATR-FTIR, XPS, SEM, AFM, water uptake, swelling degree, contact angle, surface zeta potential, ion exchange capacity, fixed charge density, and electrical resistance. Higher quaternization increased the IEC, reduced resistance, and shifted surface charge, leading to improved stack power output in model NaCl solutions. In the presence of Na2SO4, power loss was reduced for more highly quaternized membranes, indicating enhanced exclusion of divalent anions (SO42-) and reduced uphill transport. Fouling tests with humic acid/fulvic acid mixtures showed greater stability for quaternized membranes compared to a commercial benchmark. Moreover, stability tests conducted on fouled membranes revealed that the tailor-made membrane exhibits superior durability and lower fouling-induced power loss than commercial Fujifilm Type II AEMs. Overall, these results demonstrate that tuning the degree of quaternization is an effective strategy to balance conductivity and ion selectivity in AEMs for RED applications.
The Effect of Perceived Birth Trauma in Women With Planned Cesarean Section on Maternal and Paternal Attachment: Path Analysis Model
(Sage Publications Ltd, 2025) Mert-Karadas, Merve; Topal, Cansu Akdag; Karakurt, Irem; Boztepe, Handan; Nursing; 07. School of Health Sciences; 01. Atılım University
Perceived birth trauma can disrupt parent-infant bonding and affect family dynamics. This study examined the impact of perceived birth trauma on maternal and paternal attachment using path analysis. An analytical cross-sectional study was conducted with 134 mother-father pairs in Turkey, 6 months postpartum, following planned cesarean sections. Data were collected using the Traumatic Childbirth Perception Scale, Mother-to-Infant Bonding Scale, and Paternal-Infant Attachment Scale. Descriptive statistics and reliability analyses were conducted using R software. Path analysis was performed with the R package "lavaan" to assess direct and indirect relationships. Higher perceived birth trauma was significantly associated with increased maternal bonding difficulties and decreased paternal bonding. A significant negative covariance between maternal and paternal bonding scores indicated interdependent bonding dynamics. The model explained 6% of the variance in maternal bonding and 3.7% in paternal bonding. These findings underscore the need for family-centered, trauma-informed postpartum care to support healthy parent-infant attachment.

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