Atılım Üniversitesi / Atılım University
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Article Citation Count: 0-(2022) Boztepe, Handan; Boztepe, Handan; Özcebe, Hilal; NursingAmaç: Bu çalışmada, adölesan yaş grubundaki e-sağlık okuryazarlık düzeylerinin, adölesan karar verme süreçleri ile\radölesanların ve ebeveynlerin sosyal ve ekonomik belirleyicileri ile ilişkisinin ortaya çıkarılması amaçlanmıştır.\rMethods: Katılımcılar Türkiye’deki farklı sosyoekonomik yerleşimlerdeki liselerin 9-12. sınıflarında okuyan 14-18 yaş\rgrubudur. Veriler, adölesanların ve ebeveynlerinin sosyo-demografik özelliklerine ilişkin sorulardan oluşan veri toplama\rformu, Ergen Karar Verme Ölçeği ve Adölesanlar için E-Sağlık Okuryazarlığı Ölçeği kullanılarak toplanmıştır. Veriler, 14 ila\r18 yaşları arasındaki 1.082 adölesandan toplanmıştır.\r Results: Adölesanların yaşı, ailenin aylık geliri, karar verme puanları arttıkça e-sağlık okuryazarlığı düzeyi artmaktadır.\rAdolesanların ekonomik durumu ve yaşı, e-sağlık okuryazarlığını oluşturan temel faktörlerdir.\rConclusions: Adölesanlara güvenilir sağlık bilgilerini nasıl bulacaklarını ve kendi sağlıklarını korumak için uygun\rkararları nasıl alacaklarını öğretmeyi amaçlayan e-sağlık okuryazarlığı eğitiminin acilen iyileştirilmesine ihtiyaç vardır.\rGelişmekte olan ülkelerde hükümetlerin sosyal politikaları olarak düşük sosyoekonomik statüdeki ergenlere e-sağlık bilgi\rokuryazarlığı ve hizmetleri sağlanmalıdırArticle Citation Count: 13[1,2,5]thiadiazolo[3,4-g]quinoxaline acceptor-based donor-acceptor-donor-type polymers: Effect of strength and size of donors on the band gap(Wiley, 2017) Cihaner, Atilla; Karabay, Baris; Cihaner, Atilla; Ozkut, Merve Icli; Chemical EngineeringElectrochromic polymers based on [1,2,5]thiadiazolo[3,4-g]quinoxaline acceptor and thiophene, 3,4-ethylenedioxythiophene and 3,3-didecyl-3,4-proylenedioxythiophene donors, namely poly(6,7-diphenyl-4,9-di(thiophen-2-yl)-[1,2,5]thiadiazolo[3,4-g]quinoxaline) (P1), poly(4-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-9-(2,3-dihydrothieno[3,4-b][1,4]dioxin-7-yl)-6,7-diphenyl-[1,2,5]thiadiazolo[3,4-g]quinoxaline) (P2), and poly(4-(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)-9-(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-8-yl)-6,7-diphenyl-[1,2,5]thiadiazolo[3,4-g]quinoxaline) (P3), respectively, were electrochemically and/or chemically synthesized and characterized. Electrochemical and optical properties of the polymers were then investigated. The results, which were obtained electrochemically and optically, indicate that the polymers bearing the same acceptor and different donor units have a band gap range of 0.59-1.24 eV depending on the strength and size of the donor units and band gap determination method. A significant finding in this study was the phenomenon that when the acceptor is physically huge, the general rule that a weak donor would have a high band gap whereas a strong donor would have low band gap can be broken due to the torsional angles/steric hindrances involved with physically large donor molecules. (c) 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3483-3493Article Citation Count: 102A 1.6-mm, metal tube ultrasonic motor(Ieee-inst Electrical Electronics Engineers inc, 2003) Cagatay, S; Koc, B; Uchino, KA miniaturized metal tube ultrasonic motor, the dimensions of which are 1.6 mm in diameter and 6 rum in length, was developed. Two flattened surfaces with 90-degrees were ground on the outer surface of the stator. Two PZT-based piezoelectric ceramics were bonded onto these flat surfaces. The asymmetrical surface of the stator developed the split of the two degenerated orthogonal bending modes, resulting in a wobble motion. The working frequency of the 1.6-mm motor with 6 mm in length was 130 kHz. A torque of 0.5 mNm was reached at a maximum power of 45 mW with a speed of 45 rad/sec. The maximum efficiency was 16%.Article Citation Count: 016S Bacterial Metagenomic Analysis of Herby Cheese (Otlu Peynir) Microbiota(Istanbul Univ-cerrahpasa, 2021) Sudağıdan, Mert; Yurt, Mediha Nur Zafer; Taşbaşı, Behiye Büşra; Acar, Elif Esma; Ömeroğlu, Esra Ersoy; Uçak, Samet; Aydın, AliCheese microbiota may contain various bacterial species due to the use of different types of milk, rennet, and herbs. In this study, the distribution of the dominant bacteria present in the microbiota of herby cheese samples (n = 13) were examined by the next generation sequencing (NGS) technique. DNA was extracted both directly from cheese samples and after pre-enrichment. The metagenomic analysis of the NGS results revealed that Firmicutes were dominant both in DNA directly extracted from herby cheese (KOP), and pre-enriched samples (OP), at the phylum level. At the genus level, Lactobacillus, Lactococcus, and Streptococcus were dominant in the KOP samples, whereas in the OP samples, Enterococcus, Streptococcus, and Bacillus were determined as the dominant bacterial genera. Although Lactococcus raffinolactis and Streptococcus salivarius were dominant in the KOP samples, Enterococcus faecalis and S. salivarius were dominant in the OP samples. The Shannon species diversity index and principal coordinates analysis (PCoA) were used to determine the distribution in KOP and OP samples at the genus level. The PCoA of KOP-10, KOP-11, KOP-2, and KOP-7, KOP-3, and KOP-6 samples showed the wide distribution, whereas KOP-5, KOP-8, KOP-9, and KOP-14 herby cheese samples were closely related. The OP samples, especially OP-7 and OP-14, showed wide distribution in comparison to other OP samples. Finally, the dominant bacterial communities were identified by DNAbased metagenomic analysis, and this is the first report to elucidate the microbiota of herby cheese produced in Turkey using the NGS technique.Article Citation Count: 52-D digital filter realization without overflow oscillations(Pergamon-elsevier Science Ltd, 2013) Sıngh, Vımal; Department of Mechatronics EngineeringA novel criterion for the elimination of overflow oscillations in 2-D state-space digital filters described by the Roesser model employing two's complement overflow arithmetic is presented. The criterion takes the form of linear matrix inequality (LMI) and, hence, is computationally tractable. The criterion is a generalization and improvement over an earlier criterion. An example shows the effectiveness of the new criterion. (C) 2012 Elsevier Ltd. All rights reserved.Article Citation Count: 02014-2019 YILLARI ARASINDA GERÇEKLEŞEN ENDÜSTRİYEL TASARIM EĞİTİMİNDE ORTAK TEMEL TASARIM ÇALIŞTAYLARININ ETKİLERİ(2021) Özsuca, Fatma Filiz; Industrial DesignTüm tasarım disiplinlerinde olduğu gibi Endüstriyel Tasarım eğitimi de “Temel Tasarım” ile başlar. Orta öğretimin sonuna kadar hiç karşılaşılmayan bir yöntemle ders yapmak, uygulamalı olarak soyut konuları görselleştirmek, öğrencilerin en çok zorlandığı aşamadır. Türkiye’de günümüz verilerine göre 32 üniversitede Endüstriyel Tasarım eğitimi verilmektedir. Bu üniversitelerin 5 tanesinin bulunduğu Ankara’da 2014 yılında başlatılan bir çalıştay formatı ile eğitim öğretimde ortak, farklı yöntemler ile öğrenci profillerinin eğitimdeki etkileri gözlenmiştir. Çalıştay formatının amacı öğrenciler, öğretim elemanları ve ders içerikleri ile işleniş yöntemlerinin karşılıklı tanıtılması ve aynı eğitimi alan öğrencilerin ortak zeminde iş yapma becerisi elde edebilmesine yardımcı olmaktır. Çalıştay çıktısı olarak yapılan işlerin sergilenmesi de önemlidir. Aynı formatta toplam 3 çalıştay gerçekleşmiştir. 2017 sonrasında gerek üniversitelerdeki kontenjanın artması ve gerekse mekânsal sınırlılıklar sonucu farklı bir formatta çalıştaylar gerçekleşmiştir. Bu makalede ortak çalıştaylar ve farklı okullar ile Atılım Üniversitesi Endüstriyel Tasarımı Bölümü olarak katılım sağlanan ortak çalıştaylar incelenmiştir. Burada incelenen çalıştaylar dışında farklı okullar arasında ortak çalışmaların yapıldığı bilinmektedir.Article Citation Count: 023 Ekim 2011 Van, Türkiye Depremi Sırasında Gedikbulak Okul Binasının Yıkılması(2023) Mertol, Halit Cenan; Civil Engineering23 Ekim 2011 tarihinde Türkiye'nin doğusunda Mw = 7,2 (ML = 6,7) büyüklüğünde bir deprem meydana gelmiştir. Yer hareketinin en yüksek yer ivmesi 0.18×g olarak ölçülmüştür. Deprem, yığma ve betonarme yapılarda küçük çatlaklardan tamamen göçmeye kadar değişen hasarlara neden olmuştur. Bu depremde, Gedikbulak Köyü'ndeki 4 katlı betonarme okul binası tamamen yıkılmıştır. Bu okul binası Türkiye Cumhuriyeti Milli Eğitim Bakanlığı tarafından hazırlanan tipik bir projedir (No: 10370) ve bu tipik proje Türkiye'nin çeşitli yerlerinde okul binalarının yapımında yaygın olarak kullanılmıştır. Bu makalede, Atılım Üniversitesi Keşif Takımının ana şoktan birkaç gün sonra okul binasının yıkıldığı yerde yaptığı saha gözlemleri ve okul binasının yıkılma nedenleri üzerinde durularak detaylı analizleri anlatılmaktadır. Analiz sonuçları göçmenin, düz donatı çubuklarının yetersiz kenetlenme ve bindirme boyu nedeniyle perde duvarların tabanının (hem x- hem de y- yönlerinde) temelden ayrılmasından kaynaklandığını göstermiştir. Yapılan inceleme ve analizler sonucunda benzer mevcut okul binalarının gelecekteki depremlerde yıkılmaması için önerilerde bulunulmuştur.Article Citation Count: 53-D Dynamic UAV Base Station Location Problem(informs, 2021) Çiçek, Cihan Tuğrul; Shen, Zuo-Jun Max; Gultekin, Hakan; Tavli, Bulent; Industrial EngineeringWe address a dynamic covering location problem of an unmanned aerial vehicle base station (UAV-BS), in which the location sequence of a single UAV-BS in a wireless communication network is determined to satisfy data demand arising from ground users. This problem is especially relevant in the context of smart grid and disaster relief. The vertical movement ability of the UAV-BS and nonconvex covering functions in wireless communication restrict utilizing classical planar covering location approaches. Therefore, we develop new formulations to this emerging problem for a finite time horizon to maximize the total coverage. In particular, we develop a mixed-integer nonlinear programming formulation that is nonconvex in nature and propose a Lagrangean decomposition algorithm (LDA) to solve this formulation. Because of the high complexity of the problem, the LDA is still unable to find good local solutions to large-scale problems. Therefore, we develop a continuum approximation (CA) model and show that CA would be a promising approach in terms of both computational time and solution accuracy. Our numerical study also shows that the CA model can be a remedy to build efficient initial solutions for exact solution algorithms. Summary of Contribution: This paper addresses a facet of mixed integer nonlinear programming formulations. Dynamic facility location problems (DFLPs) arise in a wide range of applications. However, classical DFLPs typically focus on the two-dimensional spaces. Emerging technologies in wireless communication and some other promising application areas, such as smart grids, have brought new location problems that cannot be solved with classical approaches. For practical reasons, many research attempts to solve this new problem, especially by researchers whose primary research area is not OR, have seemed far from analyzing the characteristics of the formulations. Rather, solution-oriented greedy heuristics have been proposed. This paper has two main objectives: (i) to close the gap between practical and theoretical sides of this new problem with the help of current knowledge that OR possesses to solve facility location problems and (ii) to support the findings with an exhaustive computational study to show how these findings can be applied to practice.Article Citation Count: 0A 30-year journey of hospitality and tourism research: a comprehensive topic modeling analysis(Emerald Group Publishing Ltd, 2024) Tuzlukaya, Şule; Assefa, Feven Zewdie; Tuzlukaya, Sule Erdem; Karatepe, Osman M.; BusinessPurposeThe purpose of this study is to provide an overview of the research conducted on hospitality and tourism articles published in Q1 category journals from 1990 to 2023. This study also aims to measure the topic prevalence in selected journals throughout the years, their change over time and similarities of journals.Design/methodology/approachLatent dirichlet allocation algorithm is used as a topic modeling method to identify and analyze topics in hospitality and tourism research over the past 30 years.FindingsThe results of the study indicate that hospitality and tourism research has recently focused on topics such as employee behavior, customer satisfaction, online reviews, medical tourism and tourist experience. However, the results also indicate a negative trend in topics such as hotel management, sustainability, profession, economic growth and tourist destination.Practical implicationsThis study can be used to examine the evolution of research patterns over time, find hot and cold themes and uncover untapped or understudied areas. This can aid academics in their investigations and practitioners in making sound strategic decisions.Originality/valueThis study contributes to the existing literature by providing a new approach and comprehensive analysis of hospitality and tourism research topics. It delineates an overview of the progression of hospitality and tourism research over the past 30 years, identifies the trending topics and explores the potential impacts that these identified topics may have on future studies.Article Citation Count: 0359 Türkçe Kişilik Sıfatının Beğenirlik Değerlendirmeleri(2018) Demirutku, Kürşad; Orta, İrem Metin; Metin Orta, İrem; Department of PsychologyPsikolojinin farklı altalanlarında değişik konu başlıklarında yapılan çalışmalarda kişilik sıfatları uyaran olarak kullanılagelmiştir. Bu tür çalışmalarda sözcüklerin beğenirlik normlarının bilinmesi, olası karıştırıcı etkileri kontrolaltına almak için önemlidir. Ancak, ilgili alanyazında Türkçe kişilik sıfatlarının beğenirlik normlarını içeren böylesibir veritabanı yoktur. Bu çalışmanın amacı bu eksiği giderecek bir veritabanı oluşturmaktır. Ardışık dört çalışmada,öncelikle Türkçe kişilik sıfatlarını içeren bir sözcük havuzu oluşturulmuştur. Ardından, bu ilk listedeki sıfatların anlamlılık düzeyleri incelenmiş ve 359 kişilik sıfatını içeren nihai liste hazırlanmıştır. Bu liste bir üniversite öğrencisiörneklemine sunularak her bir sıfat için beğenirlik ölçümleri alınmıştır. Son olarak, farklı bir üniversite öğrencisiörnekleminde test-tekrar test güvenirlik katsayıları hesaplanmıştır. Buna ek olarak, beğenirlik ölçümlerinin geçerliğini sınamak için iki denence geliştirilmiştir. Birinci denenceyi destekler şekilde havuzdaki kişilik sıfatlarınınTürkçe’deki kullanım sıklığı ile çalışmada ölçülen beğenirlik puanları arasında pozitif korelasyon gözlenmiştir.Ayrıca, ikinci denencede önerildiği üzere, olumsuz kişilik sıfatlarının düşük beğenirlik değerlendirmelerinin, olumlukişilik sıfatlarının yüksek beğenirlik değerlendirmelerinden daha güçlü olduğu da etki büyüklüğü ölçümleriyle tespit edilmiştir. Çalışmanın sınırlılıkları göz önünde bulundurularak, oluşturulan veritabanının Türkiye’de yapılacakbenlik kavramı, kalıpyargılar, prototipler, izlenim oluşturma ve bellek süreçleri gibi çeşitli başlıklardaki çalışmalarayöntemsel bir kaynak olacağı düşünülmektedir.Review Citation Count: 43D Bioprinting tissue analogs: Current development and translational implications(Sage Publications inc, 2023) Liu, Suihong; Cheng, Lijia; Liu, Yakui; Zhang, Haiguang; Song, Yongteng; Park, Jeong-Hui; Ramalingam, MuruganThree-dimensional (3D) bioprinting is a promising and rapidly evolving technology in the field of additive manufacturing. It enables the fabrication of living cellular constructs with complex architectures that are suitable for various biomedical applications, such as tissue engineering, disease modeling, drug screening, and precision regenerative medicine. The ultimate goal of bioprinting is to produce stable, anatomically-shaped, human-scale functional organs or tissue substitutes that can be implanted. Although various bioprinting techniques have emerged to develop customized tissue-engineering substitutes over the past decade, several challenges remain in fabricating volumetric tissue constructs with complex shapes and sizes and translating the printed products into clinical practice. Thus, it is crucial to develop a successful strategy for translating research outputs into clinical practice to address the current organ and tissue crises and improve patients' quality of life. This review article discusses the challenges of the existing bioprinting processes in preparing clinically relevant tissue substitutes. It further reviews various strategies and technical feasibility to overcome the challenges that limit the fabrication of volumetric biological constructs and their translational implications. Additionally, the article highlights exciting technological advances in the 3D bioprinting of anatomically shaped tissue substitutes and suggests future research and development directions. This review aims to provide readers with insight into the state-of-the-art 3D bioprinting techniques as powerful tools in engineering functional tissues and organs.Book Part Citation Count: 03D Printing and Bioprinting Technologies in Pharmaceutics: Commercial Perspectives and Market Analytics.(CRC Press, 2023) Liu,S.; Liu,Y.; Hu,Q.; Zhang,H.; Park,J.-H.; Dashnyam,K.; Ramalingam,M.Three-dimensional (3D) printing is a fast-emerging applied technology that has had a major impact on healthcare applications, particularly the pharmaceutical field, over the last decades. 3D printing, also known as additive manufacturing (AM), has been used for building a wide range of 3D structures and complex geometries layer by layer through a computer-aided design since the early 1980s [1]. 3D printing widens the manufacturing window, allowing the production of customized medical devices from metals, ceramics, and polymers without the need for molds or machining which was typically used in conventional formative and subtractive manufacturing [1,2]. Since the early 2000s, 3D printing has been successfully applied in pharmaceutics, tissue engineering, and regenerative medicine due to its capability for the fabrication of 3D biological constructs with high shape complexity and fidelity [3,4]. 3D printing involving biological substances is called 3D bioprinting, where bioinks, which comprise a choice of biomaterials, cells, drugs, proteins, or growth factors, play a major role in printing desired constructs or devices [5]. 3D bioprinting could transform the future of medicine, that is, the way drugs and complex living tissues are made. © 2024 selection and editorial matter, Jose Luis Pedraz Muñoz, Laura Saenz del Burgo Martínez, Gustavo Puras Ochoa, Jon Zarate Sesma; individual chapters, the contributorsConference Object Citation Count: 24-Stage Target Detection Approach in Hyperspectral Images(IEEE Computer Society, 2018) Güneş, Ahmet; Gunes,A.; Esin,Y.E.; Ozturk,S.; Demirel,B.; Department of Mechatronics EngineeringPractical target detection systems require an automatic way to detect targets with high accuracy. Detection errors is not tolerable and they should be reduced as much as possible. In classical detection systems, generally single target detection algorithm is performed and the result will be evaluated according to the thresholding techniques. However, in these uncontrolled systems, false alarm rate strongly depends on the thresholding technique success. It is very hard to find a general and constant threshold value for images taken at different conditions and practical detection systems needs reliable threshold value. In this paper, we propose a new multi-stage target detection system which is the combination of different detection algorithms and thresholding technique. This system compose of 4-stages, i.e. namely 1-initial target detection (ACE, GLRT), 2-adaptive Constant False Alarm Rate (CFAR) thresholding, 3-spatially grouping, 4-statistical confidence operation. This system configuration removes the need for interactive user and it automatically implements confirmation and rejection steps. Moreover, this system can be used both for pure pixel and subpixel target detection purposes and it reduces computational processing time considerably with the implementation of consequtive processing stages. © 2018 IEEE.Article Citation Count: 06 Şubat 2023 Depremlerinde Gözlenen Betonarme Binalardaki Sorunların Hiyerarşik Bir Üçgen ile Açıklanması(2023) Mertol, Halit Cenan; Civil EngineeringÜlkemiz 6 Şubat 2023 tarihinde, saat 04:17’de merkez üssü Kahramanmaraş’ın Pazarcık ilçesi olan $M_w=7.74 büyüklüğünde bir depremle sarsılmıştır. Yaklaşık dokuz saat sonra, saat 13:24’te, bu sefer merkez üssü Kahramanmaraş’ın Elbistan ilçesi olan $M_w=7.6$ büyüklüğünde ikinci bir deprem oluşmuştur. Depremlerin çevresinde bulunan 11 şehir afet bölgesi kapsamına alınmıştır. Çevre, Şehircilik ve İklim Değişikliği Bakanlığı’nın verilerine göre bölgede 582000 bağımsız bölüm ve 202000 binanın acil yıkılacak, ağır hasarlı veya yıkık olduğu saptanmıştır. Bu makalede, deprem bölgesine yapılan, depremin olduğu gün başlayan ve 5 gün süren incelemeler neticesinde, betonarme binalarda yıkılmaya neden olan sorunlar hiyerarşik bir üçgen şeklinde, önem sırasına göre anlatılmıştır. Yetersiz kenetlenme boyu, etriye uçlarının 135° derece bükülmemesi, malzeme ile ilgili sorunlar, kolon ve kiriş uç bölgelerinde sarılma bölgelerinin bulunmaması, güçlü kiriş-zayıf kolon, vb. sorunların yıkımların önemli bir kısmını oluşturduğu gözlemlenmiştir. Yıkılan yapıların, yapıldıkları dönemde yürürlükte olan deprem yönetmeliklerinin şartlarını yerine getirmediği görülmüştür.Article Citation Count: 2Ab initio study of structural and electronic properties of single crystal and core/shell II-VI semiconductor nanowires(Elsevier, 2016) Ronganakis, Rengin Peköz; Department of Electrical & Electronics EngineeringStructural and electronic properties of pristine and H-passivated wurtzite type ZnSe, ZnTe nanowires and ZnX/ZnY (X = Se(Te) and Y = Te(Se)) core/shell nanowires oriented along the [0001] direction have been investigated using first-principles calculations. The changes in the electronic structure of the nanowires due to the quantum confinement and morphology have been searched. Quantum confinement increases the band gap energy as the diameters of ZnSe and ZnTe nanowires decrease. Both homostructured and heterostructured nanowires are found to show a semiconducting character with direct band gaps at Gamma-point. Changing the morphology from homostructured nanowires to heterostructured core/shell nanowires has an important impact on the electronic structure. For instance, the charge separation of electrons and holes along the infinite direction of core/shell nanowires shows a strong preference for electron(hole) states localized inside ZnSe(ZnTe) regions. (C) 2016 Elsevier B.V. All rights reserved.Article Citation Count: 0AB VE TÜRKİYE’NIN BATI BALKAN POLİTİKALARININ BİR DEĞERLENDİRMESİ: ELEŞTİREL BİR BAKIŞ VE GELECEKTEKİ İŞBİRLİĞİNE DAİR BEKLENTİLER(Trakya Univ Balkan Yerlesesi Enstituler Binasi, 2019) Koç, Zeynep Elif; Önsoy, Murat; Koç, Zeynep Elif; International RelationsBir yumuşak güç olan AB, başta Batı Balkanlar olmak üzere uluslararası alanda etkinliğini kısıtlayıcı birçok problemle karşı karşıyadır. Bu gölgede yumuşak gücünün dönüştürücülüğü azımsanmayacak ölçüde azalmıştır. Bu makale AB’nin yakın çevresinde ve özellikle de Batı Balkanlar’da uyguladığı yumuşak güç politikalarının önündeki problemler tartışılacak ve Birliğin etkinliğini sürdürebilmesi ve bu etkinliğe yeni boyutlar katabilmesinin muhtemel yolları tartışılacaktır. Makalenin araştırma sorusu AB’nin acil olarak yüzleşmek zorunda olduğu konuların neler olduğudur. AB mekanizmalarının Birliğin yakın çevresinde istikrarı, demokrasiyi ve barışı arttırmakta başarılı olamadığı düşünüldüğünde, alternatiflerin dikkate alınması gerektiği bir gerçektir. Bu şekilde düşünüldüğünde Türkiye on yıl önceki performansıyla Batı Balkanlarda etkili olabildiğini göstermştir. Fakat ekonomik olarak zayıflayan günümüz Türkiyesi on yıl önce olduğu gibi bölge üzerinde egemenlik kurmak değil sadece bölge devletleriyle ilişkilerini güçlendirmek istemektedir.Article Citation Count: 8Absorption and optical conduction in InSe/ZnSe/InSe thin film transistors(World Scientific Publ Co Pte Ltd, 2016) Qasrawı, Atef Fayez Hasan; Qasrawi, A. F.; Department of Electrical & Electronics EngineeringIn this work, (n)InSe/(p)ZnSe and (n)InSe/(p)ZnSe/(n)InSe heterojunction thin film transistor (TFT) devices are produced by the thermal evaporation technique. They are characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion X-ray spectroscopy and optical spectroscopy techniques. While the InSe films are found to be amorphous, the ZnSe and InSe/ZnSe films exhibited polycrystalline nature of crystallization. The optical analysis has shown that these devices exhibit a conduction band offsets of 0.47 and valence band offsets of 0.67 and 0.74 eV, respectively. In addition, while the dielectric spectra of the InSe and ZnSe displayed resonance peaks at 416 and 528 THz, the dielectric spectra of InSe/ZnSe and InSe/ZnSe/InSe layers indicated two additional peaks at 305 and 350 THz, respectively. On the other hand, the optical conductivity analysis and modeling in the light of free carrier absorption theory reflected low values of drift mobilities associated with incident alternating electric fields at terahertz frequencies. The drift mobility of the charge carrier particles at femtoseconds scattering times increased as a result of the ZnSe sandwiching between two InSe layers. The valence band offsets, the dielectric resonance at 305 and 350 THz and the optical conductivity values nominate TFT devices for use in optoelectronics.Article Citation Count: 5Absorption edge and optical constants of Tl2Ga2S3Se crystals from reflection and transmission, and ellipsometric measurements(Elsevier, 2012) Işık, Mehmet; Gasanly, N. M.; Department of Electrical & Electronics EngineeringThe optical properties of Tl2Ga2S3Se layered crystalline semiconductors were investigated from transmission, reflection and ellipsometric measurements. The experimental results of the room temperature transmission and reflection measurements performed in the wavelength range of 400-1100 nm showed the presence of both indirect and direct transitions in the band structure of the crystals with 2.38 and 2.62 eV band gap energies. Spectroscopic ellipsometry measurements on Tl2Ga2S3Se crystals were carried out on the layer-plane (0 0 1) surfaces with light polarization E perpendicular to c* in the 1.20-4.70 eV spectral range at room temperature. The real and imaginary parts of the dielectric function as well as refractive and absorption indices were found as a result of analysis of ellipsometric data. The Wemple-DiDomenico single-effective-oscillator model was used to study the dispersion of the refractive index in the below band gap energy range. The structures of critical points have been characterized from the second derivative spectra of the dielectric function. The analysis revealed four interband transition structures with 3.14, 3.40, 3.86 and 4.50 eV critical point energies. (C) 2012 Elsevier B.V. All rights reserved.Article Citation Count: 1Acceptance of Educational Use of AI Chatbots in the Context of Self-Directed Learning with Technology and ICT Self-Efficacy of Undergraduate Students(Taylor & Francis inc, 2024) Küçükergin, Kemal Gürkan; Gokcearslan, Sahin; Eşiyok, Elif; Tourism Management; Public Relations and AdvertisingFor long now, the use of Artificial Intelligence (AI) chatbots in higher education to support and engage learners in classroom learning activities has been attracting the attention of researchers. The acceptance of this technology for learning purposes is indicative of learners' intentions and actual use in the future. Hence, this study aims to test the educational use of AI chatbots in the context of self-directed learning with technology (SDLT) along with information and communication technology (ICT) self-efficacy, using the extended Technology Acceptance Model (TAM). The study involved 414 undergraduate students, and the research model was tested by utilizing the Partial Least Square Structural Equation Model (PLS-SEM). The results indicate that ICT self-efficacy affects only the perceived ease of use (PEU), whereas PEU and perceived usefulness have a positive effect on the intention to use AI chatbots. Moreover, SDLT is shown to affect both the intention and the actual use of AI chatbots. As such, it is suggested - among other notes - that universities update their curricula and activities to support SDLT, and also organize activities in order to increase ICT self-efficacy among students.Article Citation Count: 28Accessibility evaluation of top university websites: a comparative study of Kyrgyzstan, Azerbaijan, Kazakhstan and Turkey(Springer Heidelberg, 2018) İnal, Yavuz; Inal, Yavuz; Information Systems EngineeringIt is important that university websites and services offered through their sites are used effectively, efficiently and satisfactorily by the whole target group of the university, including disabled users. However, universities in many countries are still unable to meet the criteria for web accessibility. This study aimed to test the websites of the top universities in Kyrgyzstan, Kazakhstan, Azerbaijan and Turkey using automated assessment tools. The results showed that university websites are more popular in Turkey, and in Turkish universities developers pay more attention to the performance of websites, followed by websites of Azerbaijani, Kyrgyz and Kazakh universities. The majority of the university websites in the study did not meet the WCAG 2.0 accessibility criteria. Only two Kyrgyz and two Kazakh university websites attained conformance level A, and only three, one Kyrgyz and two Kazakh, achieved accessibility conformance level AAA. Based on the results, it was determined that universities included in the present study need to devote more effort to making their websites more accessible for their users.