WoS

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

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Citation - WoS: 3
An Agent-based Trading Infrastructure for Combinatorial Reverse Auctions
(Ieee, 2014) Bayindir, Hakan; Kilic, Hurevren; Rehan, Mohammed
A Combinatorial Reverse Auction Trading Infrastructure - CRATI is designed and implemented as an agent-based system. Two basic building blocks Java Agent Development Framework (JADE) and an Open Source Java Constraint Programming Library (Choco Solver) are used to facilitate agent interactions and an optimization task. For our purpose, it is shown that auction Winner Determination Problem (WDP) can suitably be represented as a weighted set covering problem instance whose solution gives the decided winners of the auction process. In order to realize the system, a variation of Contract Net protocol is designed and implemented to handle auctions that occur in the platform from start to finish.
The American Dream: Cultural and Social Downfall in John Steinbeck's of Mice and Men
(Literary Voice, 2022) Aras, Goksen; Takva, Serdar
As known, throughout history, most societies have experienced hard times that have made life difficult to bear. Among these hard times are political, social and economic conditions which shape the ways human beings perceive the world and lead their lives. The Great Depression, that ravaged American society in the 1929s, is one of the most catastrophic economic events in the history of America and it is considered to be a calamity resulting in unemployed, desperate and even homeless people. John Steinbeck, being one of the foremost representatives of American writers, handles the devastating effects of the Great Depression and how it affected numerous people from different parts of the community. In this period, from women to the black, from the old to the disabled. most people wanted to lead a life based on humanly standards but what they expected turned into a frustration paving the way for the impossibility of the American dream and thus cultural and social downfall of such people no matter how hard they try to achieve their goals. Steinbeck's novel titled Of Mice and Men in this context is a touching representation of frustration, hopelessness, despair to have a place to live in, and a portrayal of unattainable happiness and the impossible American dream. This paper explores the futile efforts to realize the American dream and thus unhappiness and failure from Steinbeck's point of view and it presents the reflections of such a concept through the fictionalized characters in the novel.
Analytic Hierarchy Process in Determining Aircraft Basic Maintenance Training Durations
(Emerald Group Publishing Ltd, 2026) Acikel, Gurkan; Temel, Mine Alemdaroglu; Alemdaroğlu Temel, Mine
Purpose - Currently, in aircraft basic maintenance training, it is determined that various aircraft basic maintenance training organizations around the world apply different basic maintenance durations for the same modules of the same licence categories. Aircraft basic maintenance training organizations are lacking a common curriculum with standard durations for the basic maintenance training modules. To remedy the problems associated with this issue, the purpose of this study is to develop and demonstrate a quantifiable reference (i.e. theoretical training and evaluation content intensity) based scientific theoretical method to determine the durations of the basic theoretical maintenance trainings held for B1.1 and B2 licence categories in aircraft basic maintenance training organizations. Design/methodology/approach - The total basic maintenance training duration was first allocated to basic, theoretical and practical maintenance trainings. The obtained basic theoretical maintenance training duration was then allocated to related modules and submodules by using weighted theoretical training content intensity and weighted theoretical evaluation content intensity, which were obtained by applying a multi-criteria decision-making approach using the analytic hierarchy process (AHP). Findings - In this study, it was found that there is no standardization upon aircraft basic maintenance training organizations for the allocation of the basic maintenance training durations to modules. To remedy this problem, a scientific method, which relies on quantifiable reference bases rather than subjective reasoning, is needed. The reference bases of the proposed theoretical method (i.e. theoretical training and evaluation content intensity) can be tuned with the inclusion of the effect of basic knowledge requirements through multi-criteria decision-making (AHP). The theoretical method proposed in this work is robust in terms of resulting in close proximity values of the basic theoretical maintenance training durations for the common modules of B1.1 and B2 licence categories. The theoretical method is proven to yield greater basic theoretical maintenance training durations for modules having greater theoretical training and evaluation content intensity and lower basic theoretical maintenance training durations for modules having less theoretical training and evaluation content intensity. A distinct similarity in terms of basic theoretical maintenance training durations and the ranking of the modules (in terms of durations) is not present when the average of the training organizations is compared to the results of the theoretical method. A quantifiable reference (i.e. theoretical training and evaluation content intensity) based scientific theoretical method to determine basic theoretical maintenance training durations was developed and demonstrated. Practical implications - Results of this study would especially be useful in an international effort to standardize the different basic theoretical maintenance training durations applied in various aircraft basic maintenance training organizations. Originality/value - To the best of the authors' knowledge, this study is the first in providing and demonstrating a scientific theoretical method based on a systematic, multi-criteria decision-making approach to determine the durations of the basic theoretical maintenance trainings.
Citation - WoS: 2
Anti-Immigration Conspiracy Beliefs Are Associated With Endorsement of Conventional and Violent Actions Opposing Immigration and Attitudes Towards Democracy Across 21 Countries
(SpringerNature, 2025) Thomas, Emma F.; Stothard, Christina; Besta, Tomasz; Akbas, Gulcin; Becker, Julia C.; Becker, Maja; van Zomeren, Martijn
Despite widespread speculation that conspiracy beliefs foster anti-democratic outcomes, the empirical picture is inconsistent. To clarify this literature, we examine the relationships that conspiracy beliefs have with commitment to reactionary action and criticism of democracy, focusing on a global issue: immigration. We expected that people who believe that their government uses immigration to diversify the population against citizens' wishes (anti-migration conspiracy beliefs) would be more committed to conventional and violent action to oppose immigration, and more critical of democracy. However, societal-level factors - economic performance and democratic functioning - were expected to influence (strengthen, weaken) these links. As hypothesized, multi-level analyses (N = 4353) from 21 countries revealed that economic prosperity attenuated the positive link between anti-migration conspiracy beliefs and commitment to reactionary action. Paradoxically, more democratic societies evidenced stronger links between conspiracy beliefs and conventional (but not violent) action to oppose immigration. Thus, more democratic societies appear to invite conventional forms of action to oppose immigration which may, in turn, weaken democratic norms of inclusion. Results highlight the interplay of individual- and societal-level factors underlying illiberal movements.
An Application of Stochastic Maximum Principle for a Constrained System With Memory
(Ankara Univ, Fac Sci, 2025) Savku, Emel
In this research article, we study a stochastic control problem in a theoretical frame to solve a constrained task under memory impact. The nature of memory is modeled by Stochastic Differential Delay Equations and our state process evolves according to a jump-diffusion process with time-delay. We work on two specific types of constraints, which are described in the stochastic control problem as running gain components. We develop two theorems for corresponding deterministic and stochastic Lagrange multipliers. Furthermore, these theorems are applicable to a wide range of continuous-time stochastic optimal control problems in a diversified scientific area such as Operations Research, Biology, Computer Science, Engineering and Finance. Here, in this work, we apply our results to a financial application to investigate the optimal consumption process of a company via its wealth process with historical performance. We utilize the stochastic maximum principle, which is one of the main methods of continuous-time Stochastic Optimal Control theory. Moreover, we compute a real-valued Lagrange multiplier and clarify the relation between this value and the specified constraint.
Bibliometric Analysis of Authors Contributing to the Development of Health Management and Studies Published in WOS in the Field of Health Management
(Sage Publications India Pvt Ltd, 2025) Tengilimoglu, Dilaver; Tas, Merve Ozzeybek; Seyhan, Firat; Younis, Mustafa Z.
In this study, scientific publications on the management of health institutions and health services, which are becoming increasingly important both in the country and in the world agenda, have been analysed, and it is aimed to make a comprehensive determination by analysing the annual publication amounts, most cited works, most relevant and influential source analysis, source co-citation network analysis, most relevant and influential author analysis, cooperation between authors analysis, author co-citation network analysis, and country's scientific production map and cooperation analysis. The result of the analysis showed that 3,940 article-type documents were published from 1,466 different sources between 1977 and 2021. The country that published the highest number of articles in the field of study was the USA, with 3,405 articles. In the analysis of the most relevant and influential sources, the most relevant source was found as 'Health Policy', which has published 80 articles since its first publication in 1986. The most relevant author in the study field was Yasumura who published 63 articles in total and was found to be one of the most influential authors in the study field. This study is evaluated to provide a macroscopic perspective for all stakeholders interested in the subject and those involved in the health system by providing a holistic perspective.
Citation - WoS: 1
BIOINSPIRED CONCEPTUAL DESIGN (BICD): CONCEPTUAL DESIGN OF A GRASSHOPPER-LIKE JUMPING MECHANISM AS A CASE STUDY
(design Soc, 2011) Eroglu, Aylin Konez; Erden, Zuhal; Erden, Abdulkadir
The evolution process of nature creates highly effective, power efficient, and perfectly structured biological systems. These excellent systems provide an inexhaustible source for engineers and scientists who desire to inspire ideas, processes, structures, functions, and behaviors from biological domain and implement them into engineering domain. This approach is called "Bioinspired" and challenging for engineers. However, some problems of the practical approaches are observed. One of the problems is "ad hoc" nature of the process. Each bioinspired design product has resulted in a differing design process and a generalization was not possible. Another problem rises due to the terminology difference between engineers and biologists. To overcome these problems, a need for a systematic bioinspired design (BID) process was realized in early 2000s and since then, considerable research on the BID methodology has been progressed. Within the context of BID, this paper introduces a new approach on bioinspired conceptual design (BICD) procedure for hybrid bioinspired robots which can be inspired from multiple biological systems. An illustrative case study is given in the paper.
Citation - WoS: 3
Biomechanical Design and Control of Lower Limb Exoskeleton for Sit-to-Stand and Stand-to-Sit Movements
(Ieee, 2018) Qureshi, Muhammad Hamza; Masood, Zeeshan; Rehman, Linta; Owais, Muhammad; Khan, Muhammad Umer
In this paper, we present design and development phase of lower limb robotic exoskeleton that can assist paralyzed individuals. Motion of the human wearing exoskeleton is introduced by actuators. Both exoskeleton legs are attached to the supporting frame by passive universal joints. The exoskeleton provides 3 DOFs per limb of which two joints are active and one passive. The control actions i.e., sit-to-stand and stand-to-sit movements are triggered using Double Pole Double Throw (DPDT) toggle switch. The control scheme is implement using Switch control method and the feedback is provided by means of current measurement. This assistive device can be utilized for the disabled persons. The simulation results are provided that evaluates the performance of the control actions on exoskeleton.
Citation - WoS: 1
Characterization of Satellite Transponder Impairments Based on Simulations with Test Data
(Ieee, 2015) Ulubey, Orhan; Gulgonul, Senol; Kara, Ali
A satellite transponder simulator based on actual test data of TURKSAT 3A satellite has been developed to analyze degradation in multicarrier scenarios. Communication impairment sources through a transponder are explained in conjunction with a methodology defined to characterize total degradation resulting from them. Several transponder utilization scenarios are studied with respect to total degradation and optimum operation conditions are demonstrated.
Cluttered Thoughts
(Forum Literary Voice, 2024) Aras, Goksen
[No Abstract Available]
Comparative Analysis of Vibration Axis Effects on Ultrasonic Vibration-Assisted Machining of Inconel 718
(Multidisciplinary Digital Publishing Institute (MDPI), 2026) Namlu, R.H.; Kilic, Z.M.
Inconel 718 is widely utilized in critical engineering sectors, particularly aerospace, owing to its exceptional creep resistance, corrosion resistance, and retention of mechanical strength at elevated temperatures. However, its high hardness, low thermal conductivity, and strong work-hardening tendency make it extremely difficult to machine using conventional techniques. Ultrasonic Vibration-Assisted Machining (UVAM) has emerged as an effective strategy to overcome these limitations by superimposing high-frequency, low-amplitude vibrations onto the cutting process. Depending on the vibration direction, UVAM can significantly change chip formation, tool–workpiece interaction, and surface integrity. In this study, the influence of three UVAM modes—longitudinal (Z-UVAM), feed-directional (X-UVAM), and multi-axial (XZ-UVAM)—on the machining behavior of Inconel 718 was systematically investigated. The findings reveal that XZ-UVAM provides the most advantageous outcomes, primarily due to its intermittent cutting mechanism. Compared with Conventional Machining (CM), XZ-UVAM reduced cutting forces by up to 43% and areal surface roughness by 37%, while generating surfaces with more uniform topographies and smaller peak-to-valley variations. Furthermore, UVAM enhanced subsurface microhardness as a result of the surface hammering effect, which may improve fatigue performance. XZ-UVAM also effectively minimized burr formation, demonstrating its potential for high-quality, sustainable, and efficient machining of Inconel 718. © 2026 by the authors.
COMPARISON OF COMPUTER-BASED PROPAGATION MODELS WITH EXPERIMENTAL DATA COLLECTED IN AN URBAN AREA AT 1800 MHz
(Ieee, 2015) Acar, Tarik; Caliskan, Fatma; Aydin, Elif
Nowadays a lot of models are set for the efficient and economic usage of frequency band since the band is a limited source. Therefore, the propagation models created for this purpose were studied in the literature. These models are Free Space Path Loss (Fspl) + Reflection plus Multiple Diffraction (RMD), COST-Hata and COST-WI models. In order to compare the success of the models, electric field strength measurements were taken in a chosen district (Mustafa Kemal Mahallesi Ankara, Turkey) where an irregular structure style can be observed. First set of measurements were recorded at random coordinates and second set of measurements were collected by the following coordinates tracking on a single line. As a conclusion, measured values were compared with the results which were taken from the mentioned models with graphical presentations. The most appropriate model was tried to be found and as another aim of the study, a correction factor was generated as a modification for COST-Hata propagation model.
A Comparison of Wavelet Family of Transforms from Image Forensics Perspective
(Turgut Ozal Univ, 2012) Ozparlak, Levent; Avcibas, Ismail
In this study, we compare wavelet based transforms for the cases of different image forensics problems. We extract wavelet based features and make experiments for different problems. The results show that a mixture of wavelet based features give the best performance in each experiment. In the absence of such a classifier with mixed features, the best performing features were obtained from contourlet transform coefficients.
A Computationally Efficient Approximation for Fractional Differencing: First-Order Operators
(Pergamon-Elsevier Science Ltd, 2026) Omay, Tolga; Baleanu, Dumitru
This paper introduces the First-Order Fractional Differencing (FOFD) operator that substantially reduces the computational burden of fractional differencing for large-scale applications. While the standard Gr & uuml;nwald-Letnikov (GL) operator requires O(T2) operations for a series of length T, and recent FFT-based methods achieve O(T log T), our FOFD operator requires only O(T) operations through a simple two-point recursion. We develop an optimal weight calibration framework that ensures this computational efficiency does not compromise statistical accuracy, deriving a general formula wopt = d & sdot; (1-0.9 rho)beta(p) that adapts to the persistence structure of autoregressive processes. Empirical applications demonstrate substantial improvements: for the Chicago Fed National Financial Conditions Index with extreme persistence (rho= 0.992), optimal weight calibration reduces approximation error by 93% while preserving the autocorrelation structure of the GL operator. For a series of 10,000 observations, our method requires 20,000 operations compared to 530,000 for FFT-based methods and 50 million for standard implementations-enabling fractional differencing in real-time and high-frequency contexts previously infeasible due to computational constraints. The method's simplicity, requiring no specialized libraries and providing direct implementation through our calibration formula, makes it immediately accessible to practitioners while maintaining the long-memory properties essential for financial time series modeling.
Crack Detection on Asphalt Runway Using Unmanned Aerial Vehicle Data with Non-Crack Object Removal and Deep Learning Methods
(Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2025) Tapkin, Serkan; Tercan, Emre; Bostan, Atila; Sengul, Gokhan
Unmanned aerial vehicles are extensively utilized for image acquisition in a cheap, fast, and effective way. In this study, an automatic crack detection method with non-crack object removal and deep learning-based approaches are developed and tested on images captured by unmanned aerial vehicle. The motivation of this study is to detect either a crack exists or not in the asphalt-runway. The novelty of this study lies in integrating a non-crack artifact removal process with six classical edge detectors and comparing the resulting performance with four lightweight CNN models on the same UAV-acquired runway image dataset, enabling a unified evaluation of classical and learning-based approaches. For deep learning-based approach, four lightweight CNN models, namely GoogleNet, SqueezeNet, MobileNetv2, and ShuffleNet, are trained and the best accuracy of %87.9 is obtained whenever GoogleNet model is used. For the non-crack object removal approach, exclusion of non-crack objects from the images is the first step, where crack-detection which makes use of edge-detection techniques is the latter. In the study, Sobel, Prewitt, Canny, Laplacian of Gaussian, Roberts and Zero Cross edge detection algorithms are examined and their success rates in detecting cracks are comparatively presented. With sensitivity=0.981, specificity=0.744, accuracy=0.917, precision=0.912 and F-score=0.945 values Canny algorithm performs significantly better than others in detecting the cracks. This study provides enough evidence for the practicability of automated crack detection on unprocessed digital photographs by the results of the study conducted on asphalt runway.
Creative Pattern Trials for Above the Keyboard Wear With Trompe L'oeil Illusion
(Anadolu Univ, 2022) Aydeniz, Sena Surmeli; Cegindir, Nese Yasar
The design scenario of this study is based on seeking answers to the question "How can we produce different, extraordinary and original shirts for working women with the Trompe l'oeil (illusion) technique?". The sample of the study, in which the user-oriented design research method was used, is women working above the keyboard. Within the scope of the study, three women's shirts were produced with creative pattern applications. The classical techniques known in garment production have been reconstructed with the Trompe l'oeil technique. The findings were discussed in two dimensions as the process carried out for these three shirts and the prototype evaluation. Osborn's checklist was used to create the design value of the shirts. For the evaluations of the marketability of the products, measurement was made in the form of voting over Google Forms. As a result of the voting, the first prototype was found to be more suitable for the target audience. Based on the individual comments received, it has been observed that originality varies when the position and needs of the target audience come into play. The importance of the user profile in creative product design has been understood.
Diagnostic Value of Thyroid Physical Examination in the Elderly and Comparison with Ultrasonography
(UK Scientific Publishing Ltd, 2025) Gulmez, Mehmet Ihsan; Aydin, Canset
This study is part of the health project called "Health screening for the elderly in Ankara" for patients aged 65 and over, with 1200 participants. Patients with missing laboratory tests (n = 59), movement disorders and/or bedridden (n = 54) were excluded from the study. PE was performed by a geriatrician or an ear, nose, and throat surgeon, and ultrasonographic evaluation was performed by a radiologist. PE and USG findings were compared. We aimed to investigate the diagnostic accuracy of physical examination (PE) of the thyroid gland (TG) in patients over 65 years of age and to assess the reliability by comparing PE with ultrasonographic (USG) examination. The median age of the patients participating in the study was 71.17. When the differences between thyroid nodules (TN), the number of TN size, and goiter detection were compared in terms of PE and USG, all values were statistically signifi- cant, and P values were < 0.001. The sensitivity of PE of TG was calculated as 31.0%. In our study, the sensitivity of PE of TG in terms of TN and goiter was found to below. The diagnostic accuracy of PE of TG is low, and therefore, its impact on clinical decision-making is limited. Furthermore, detected nodules rarely progress to clinically relevant disease, leading to overdiagnosis and overtreatment. Especially in groups at risk for nodules and malignancy, PE must be combined with imaging methods and, if necessary, pathological examination, even if nodules or goiter are not palpable in PE.
Driving Conditions Leading To Thermal Runaway in Li-Ion Battery EV's
(IEEE, 2024) Ertan, H. Bulent; Azuaje-Berbeci, Bernardo J.
The adoption of high-energy-density lithium-ion batteries (LIB) as the energy source in electric vehicles (EV) introduces significant safety concerns. Thermal runaway (TR), a self-accelerating rise in battery temperature resulting in catastrophic failure, is a significant safety concern. Cooling system failure within the EV's thermal management system is one of several factors that can trigger TR. Typically, TR is initiated by exceeding a critical temperature threshold under abusive conditions. Understanding the operating conditions that lead to the path of TR is essential for ensuring EV and occupant safety. Recently, a detailed electrochemical-thermal model that incorporates the chemical reactions within the battery until TR is introduced. This paper aims to illustrate how this model can be used to identify the conditions leading to TR under realistic EV driving scenarios. For this purpose, an Advisor/Matlab-based model of a hybrid EV is developed and verified by tests, is used to estimate the current required from the vehicle's battery pack at a given driving condition. This is followed by the prediction of battery thermal response using the mentioned finite-element-analysis-based battery model. Several scenarios are tested in this paper to determine whether TR occurs and to identify the factors contributing to TR. This study aids in comprehending the factors that contribute to TR and the development of preventative measures for battery management system design.
Dual Zn/Zr Hybrid Framework-Integrated Membranes With Enhanced Proton Conductivity and Durability for High-Temperature PEM Fuel Cells
(John Wiley and Sons Inc, 2026) Altınışık, H.; Devrim, Y.
This study proposes an innovative strategy for fabricating advanced composite membranes based on a poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole] (PBI) matrix for high-temperature proton exchange membrane fuel cells (HT-PEMFCs). A co-synthesized hybrid porous framework incorporating both Zn- and Zr-based nanostructures was integrated into the PBI backbone, ensuring uniform dispersion and strong interfacial bonding, as verified by comprehensive structural and morphological characterizations. This dual-framework architecture promoted the formation of continuous proton-conductive channels and enhanced membrane stability under demanding operating conditions. Furthermore, the membranes were utilized after acid doping, and the hybrid structure effectively mitigated the acid leaching issue, ensuring stable long-term proton conductivity. At 0.6 V and 170°C, the membranes achieved a current density of ≈630 mA/cm2, demonstrating the critical role of structural optimization in improving fuel cell efficiency. These findings offer valuable insights into designing scalable, durable, and thermally stable membranes for next-generation HT-PEMFC applications. © 2025 Society of Plastics Engineers.
Effect of Training Based on Travelbee's Human-To Relationship Model on Prenatal Attachment, Fear of Childbirth, and Anxiety in Pregnant Women With Fear of Childbirth a Randomized Controlled Trial
(Slack Inc, 2025) Sari, T.; Gürhan, N.; Guerhan, Nermin
PURPOSE: To investigate the effects of education provided to pregnant women with fear of childbirth according to Travelbee's Human-to-Human Relationship Model on fear of birth, prenatal attachment, and anxiety. METHOD: This prospective, randomized controlled study was conducted between June and August 2023. Participants included 62 pregnant women divided into intervention and control groups. Pregnant primiparous women who had fear of childbirth were selected for the intervention group, receiving an eight-session educational program based on Travelbee's model. RESULTS: At the end of the educational program, decreased fear of childbirth, lower anxiety, and higher prenatal attachment were detected in the intervention group. Results showed a statistically significant difference in the intervention group compared to the control group. CONCLUSION: Birth preparation education prepared according to Travelbee's model is an effective method for reducing pregnant women's fear of childbirth and anxiety and increasing prenatal attachment level.

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