TR-Dizin İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8652

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A Chain Rule for Reduced Functional Differential Inclusions and Stability Theorems
(2025) Gokgoz, Nurgul
In order to represent real-world problems, modeling and stability concepts of a system are two essential steps, and functional differential inclusions become favorable among other methods because of their flexibility and robustness to handle those problems. Thus, functional differential inclusions (FDIs) provide a solid foundation for engineering problems, and the calculation of their derivatives becomes an important issue in checking the stability of them. Especially, to check the Lyapunov stability, various chain rules for FDIs are defined in the literature. In this work, a new chain rule is introduced in terms of the reduction procedure, a comparison with another one is represented, and the stability theorems in terms of Lyapunov are extended to the reduced functional differential inclusions.
A New Novel Model Proposal For Bond-Slip Behavior Between Angular CFRP Fan Type Anchoraged CFRP Strip and Concrete Surface
(2020) Ghoroubi, Rahim; Mercimek, Ömer; Anıl, Özgür; Özgür, A. C. Anıl
In the reinforced concrete, masonry or steel structures should be strengthened or repaired. Carbon fiber reinforced polymers (CFRP) have been widely used for the last 20 years for repairing and strengthening of inadequate earthquake performance of the structures. One of the most important developed design criteria in the retrofit and strengthening details are using CFRP to delay the debonding of the CFRP reinforcement elements. For this reason, the uses of anchors in the reinforcement details developed by using CFRP and also researches on this subject have increased substantially. In the literature, research on bond-slip models developed for fan type CFRP anchors and anchored CFRP strips used in reinforcement details are limited in comparison to non-anchored strips. However, in studies on this subject, anchors are placed at 90o to the axial tensile force applied to the CFRP strips. Axial force-bearing strength and bond-slip models of CFRP strips with the different anchored angle under axial tensile strengths have not been found in the literature. For this reason, an experimental study was carried out and 28 specimens of angled anchored CFRP strip test specimen, which was bonded to the concrete surface, was tested under the influence of axial tensile force with an experimental setup designed by the authors. The variables studied in the experimental study are the CFRP strip width and the fan type CFRP anchor angle placed on the CFRP strip. As a result of the experimental study, an equation was proposed for calculating the bearing strength values of angled anchored CFRP strips and a new proposal for the bond-slip model was developed.
A Systematic Review on AI Technologies in English as a Foreign Language Education
(2025) Toscu, Saliha
This systematic review reports an analysis of research articles on AI technologies in English as a foreign language education. The review specifically addresses the limitations reported in the studies conducted between 2020 and 2024 and shows the benefits of AI technologies identified in those studies. Hence, the study aims to provide an understanding of the scope of existing research and, depending on the limitations identified, give insights into further research. The research articles were screened and analyzed using qualitative methods based on the predetermined inclusion and exclusion criteria. The findings indicated that AI technologies may positively affect language development, cultural understanding, learner engagement, learning support, and critical thinking. Nonetheless, the limitations identified - categorized as instructional, methodological, and technological - should be taken into consideration for a more robust investigation.
Adaptation of Modern Housing Heritage: A Review through Cultural Significance
(2024) Özmen, Ayça
Modern mimarlık mirasının yıkım tehdidi altındaki sayıca en fazla tipolojilerinden biri olan çok katlı konut mirasını konu alan bu çalışma, bu tipolojinin iyi örnek uygulamaları üzerinden, korumadan dönüşüme kadar farklı adaptasyon stratejilerinin değişim ve süreklilik eşiklerini belirlemeyi amaçlamaktadır. Yirminci yüzyılın çok katlı konut mimarisinde iki dönüm noktasını temsil eden Batı Avrupa'dan üç vaka çalışması kültürel önem hiyerarşisine göre gruplandırılmıştır. Bu doğrultuda küresel öneme sahip Unité d’Habitation Marseille, yerel öneme sahip La Tour Bois-le-Prêtre ve sosyo-kültürel öneme sahip Wallisblok, yerinde gözlem ve literatür araştırması aracılığıyla incelenmiştir. Bulgular, her bir vakanın sırasıyla; mimari değer, sosyal değer ve ekonomik değer gibi farklı değer biçimlerine öncelik verdiğini ve kültürel önem hiyerarşisi azaldıkça değişimin kademeli olarak arttığını göstermektedir.
Adaptation of the Student Expectations of Online Learning Survey Revised (seols-R) Into Turkish
(Karadeniz Technical University, 2020) Dağhan, G.; Akkoyunlu, B.; Arslan, Ö.
The aim of this study is to adapt the Student Expectations of Online Learning Survey Revised [SEOLS-R] developed by Harris, Larrier and Castano-Bishop (2011) into Turkish. For this purpose, the adaptation process of the scale, which consists of 7 factors and 43 items in the 5-point Likert structure, started first with the necessary permissions, and then a translation and cultural adaptation process was carried out. After the cultural adaptation process, the construct validity of the scale was tested with 411 students who study in distance education programs of Amasya University. After the construct validity findings, the reliability values of the scale were examined. In line with the findings, it was concluded that the Turkish version of the SEOLS-R scale is a valid and reliable measurement tool suitable for Turkish culture. © 2020 Karadeniz Technical University. All rights reserved.
Citation - WoS: 1
Citation - Scopus: 1
Adaptive Decision Fusion Based Framework for Short-Term Wind Speed and Turbulence Intensity Forecasting: Case Study for North West of Turkey
(2017) Toreyin, Behcet Ugur; Dinçkal, Çiğdem; Küçükali, Serhat
:In this paper, an online learning framework called adaptive decision fusion (ADF) is employed for short-term wind speed and turbulence intensity forecasting by use of wind speed data for each season for the city of ˙Izmit, located in the northwest of Turkey. Fixed-weight (FW) linear combination is derived and used for comparison with ADF. Wind speeds and turbulence intensities are predicted from the existing wind speed data and computed turbulence intensities, respectively, using the ADF and FW methods. Simulations are carried out for each season and the results are tested on mean absolute percentage error criterion. It is shown that the proposed model captured the system dynamic behavior and made accurate predictions based on the seasonal wind speed characteristics of the site. The procedure described here can be used to estimate the local velocity and turbulence intensity in a wind power plant during a storm.
Citation - WoS: 4
Citation - Scopus: 5
An Algebraic Stability Test for Fractional Order Time Delay Systems
(Ramazan Yaman, 2020) Baleanu, Dumitru; Ozyetkin, Munevver Mine
In this study, an algebraic stability test procedure is presented for fractionalorder time delay systems. This method is based on the principle of eliminatingtime delay. The stability test of fractional order systems cannot be examineddirectly using classical methods such as Routh-Hurwitz, because such systemsdo not have analytical solutions. When a system contains the square roots ofs, it is seen that there is a double value function of s. In this study, a stabilitytest procedure is applied to systems including ps and/or different fractionaldegrees such as s where 0 < α < 1, and αǫR. For this purpose, the integerorder equivalents of fractional order terms are first used and then the stabilitytest is applied to the system by eliminating time delay. Thanks to the proposedmethod , it is not necessary to use approximations instead of time delay termsuch as Pad´e. Thus, the stability test procedure does not require the solutionof higher order equations.
Altyazı Çevirisinde Dildışı Kültürel Referansların Aktarılması: Tarihi Dizi Diriliş: Ertuğrul Üzerine Bir Çalışma
(2022) Kümbül, Tuba; Akat, Bülent
Görsel-İşitsel Çeviri'nin bir türü olan altyazının çeşitli yönleriyle ilgili olan bu makale, özellikle altyazı çevirmeninin karşılaştığı kısıtlamalara, kültürel referansların erek dilde sunulmasında karşılaşılan zorluk ve sorunlarla başa çıkmak için önerilen farklı stratejilere odaklanmıştır. Çalışmanın merkezinde Jorge Díaz-Cintas, Aline Remael ve Santamaria Guinot tarafından önerilen altyazı çeviri stratejileriyle ilgili sınıflandırma bulunmaktadır. İlk aşamada, Diriliş: Ertuğrul adlı Türkçe dizinin İngilizce versiyonunun altyazılarından seçilen Dildışı Kültürel Referanslar bu stratejiler ışığında analiz edilmiştir. Daha sonra, altyazılardaki dildışı kültürel referansların çevirisinin, kaynak kültürdeki filmin izleyicileri üzerinde yarattığı etkinin bir benzerinin hedef izleyiciler üzerinde ne ölçüde yaratabildiğini tespit etmek için altyazı çevirmeninin bu referansları tercüme etmede uyguladığı yöntemler değerlendirilmiştir. Diziden seçilen Dildışı Kültürel Referansların analizi, genel olarak altyazı çevirmeninin hedef dil ve kültür normlarına yakın olma eğiliminde olduğuna işaret etmiş ve bu yaklaşımın daha ziyade transfer esnasında orijinal ifadenin anlamında bozulma olmayacağı durumlarda ağırlık kazandığı gözlenmiştir.
Citation - WoS: 2
Citation - Scopus: 2
An Alternative Mean Reversion Test for Interest Rates
(Central Bank Republic Turkey, 2018) Ozel, Ozgur; Ilalan, Deniz
A number of empirical studies assert that interest rates are governed by unit root processes rejecting any form of reversion to a long term mean by resorting to certain tests, among which the Augmented Dickey Fuller (ADF) is the most widely used one. In this study, we propose an alternative testing methodology that can be applied along with ADF test, in the sense that there are times where it can capture stationarity when the other fails to do so. Moreover, our test has more power than ADF test. As an application to real-data, we consider 10-year US and Turkish T-bond rates. (C) 2017 Central Bank of The Republic of Turkey. Production and hosting by Elsevier B.V.
Citation - WoS: 2
Citation - Scopus: 2
Analysis of Heat Transfer Enhancement in Tubes With Capsule Dimpled Surfaces and Al2o3-Water Nanofluid
(Turkish Soc thermal Sciences Technology, 2022) Ibrahim, Mahmoud Awni A. Haj; Turkoglu, Hasmet; Yapici, Ekin Ozgirgin; Haj Ibrahim, Mahmoud Awni A.
This study aims to numerically investigate and evaluate the enhancement of heat transfer by new capsule dimples on tube surfaces for flow of water and Al2O3-water nanofluid with different concentrations, under uniform surface heat flux. The originality of this work lies in combining two passive heat transfer enhancement methods such as geometrical improvements and nanofluids together. Capsule dimples with different depths were considered. Al2O3- water nanofluid was modeled as a single-phase flow based on the mixture properties. The effects of dimple depth and nanoparticle concentrations on Nusselt number, friction factor and performance evaluation criteria (PEC) were studied. Numerical computations were performed using ANSYS Fluent commercial software for 2000-14000 Reynolds number range. It was found that when laminar, transient and fully developed turbulent flow cases are considered, increase in the dimple depth increases the Nusselt number and friction factor for both pure water and Al2O3-water nanofluids cases. Also, the friction factor increases as dimple depth increases. Results show that increase in PEC is more pronounced in the laminar region than in the transition region, it starts to decrease for turbulent flows. For nanofluid, PEC values are considerably higher than pure water cases. The variation of PEC for capsule dimpled tubes are dependent on flow regimes and dimple depths. Increasing the nano particle volume concentration and dimple depth in laminar flows increase the PEC significantly.
Citation - WoS: 2
Citation - Scopus: 3
Analysis of Mixed-Order Caputo Fractional System With Nonlocal Integral Boundary Condition
(Tubitak Scientific & Technological Research Council Turkey, 2018) Khodabakhshi, Neda; Baleanu, Dumitru; Akman Yildiz, Tugba; Yıldız, Tuğba Akman
This paper deals with a mixed-order Caputo fractional system with nonlocal integral boundary conditions. This study can be considered as an extension of previous studies, since the orders of the equations lie on different intervals. We discuss the existence and uniqueness of the solution using fixed point methods. We enrich the study with an example.
Citation - WoS: 18
Analytic Hierarchy Process (Ahp) as an Assessment Approach for Architectural Design: Case Study of Architectural Design Studio
(Konya Technical Univ, Fac Architecture & design, 2018) Harputlugil, Timucin
Architectural design is complex and can be defined as an effective decision-making activity based on problem solving. This complexity is not based on content and volume of problems, but also heterogeneity and uncertainty of information provided for assessment, subjective approaches, and a large number of the criterion for assessment. The aim of this research paper is to contribute to the researches for assessment of architectural design by providing a novel approach based on Analytic Hierarchy Process (AHP) - a Multi Criteria Decision Making (MCDM) method. The approach supports an effective comparative analysis among the alternative projects based on determined criterion. The methodology is implemented with a case study in one of the design studios of Department of Architecture of Cankaya University on final design projects of a group of students with observation, research and assessment. The data used in the assessment is collected through interviews and surveys which is analysed by the help of a software. Based on the outcomes of the AHP-based approach, it has been seen that this approach can provide numerical results that are comparable, measurable, gradable, consistent and can be reported separately for each assessor. However, it has also been found that the AHP-based method is suitable for evaluating only a limited number of projects. With the research, and by setting thresholds levels for evaluation, it has become clear that successful and unsuccessful projects can be separated for achievement and competence. Consequently, it has been observed that the approach has considerable potentials to be further developed to evaluate architectural projects comparatively, especially for architectural students' projects, and other architectural projects such as architectural design competitions.
Anayasa Değişikliklerinin Yargısal Denetimi -Karşılaştırmalı Anayasa Hukuku Merceğiyle Türkiye Örneği
(2023) Acar, Ali
For the last two decades, there has been growing scholarly interest in the issue of judicial review of constitutional amendments and the lim- its of amending power. The case law provided by various jurisdictions, e.g. India, Germany, Colombia etc. has stimulated this interest. Accordingly, the case law provided by these jurisdictions has been largely dis- cussed by scholars. The Turkish example, however, has received less at- tention from the academic world even though it offers important data re- garding the issue. In this paper, I analyse the Turkish example through the lens of comparative constitutional law. I mainly focus on the legality aspect of the issue of judicial review of constitutional amendments. In terms of legality, I present a general view on whether the judicial review of constitutional amendments can be considered legally possible and permissible. For the analysis of the legality aspect, I follow the footsteps of legal positivism—specifically Hart’s concept of the rule of recognition.
Anısal Bellekte Bilgilerin Kısa-süreli Konsolidasyonu: Dikkatin Rolü
(2021) Ozcelik, Erol; Tekman, Hasan Gürkan
Hızlı seri görsel sunum, dikkat kırpması, ve ikili görev bozulmaları olgularından elde edilen kanıtlar insanoğlunun kısa-süreli konsolidasyon sürecinde anlamlı bir sınırlılığı olduğunu öne sürmektedir. Kısa-süreli konsolidasyon, görsel temsillerin daha kalıcı bellek biçimlerine transfer edilmesidir. Yapılmış çalışmalar hedef uyaranlardan sonra gösterilen maskelerin bilgilerin konsolidasyonunu yarıda kestiğini göstermesine rağmen, bilgilerin anısal bellek için konsolidasyonunda dikkatin rolü hakkında yeterli kanıt yoktur. Dikkatin ve hedef uyaran ile maske arasındaki uyaran başlangıcı senkronizasyonsuzluğunun (UBS) anısal belleğe etkisini incelemek için üç deney yapılmıştır. Maskeler hedef uyaranlardan sonra değişen UBS'lerde sunulmuştur. Bölünmüş dikkat koşulundaki katılımcılar maskelerin sunumundan sonra dikkat gerektiren ikincil bir iş yaparken tam dikkat koşulundaki katılımcılara böyle bir görev verilmemiştir. Sonuçlar göstermiştir ki; hedef uyaranlar ile maskeler arasındaki UBS'yi düşürmek bölünmüş dikkatte bellek performansını düşürürken tam dikkatte performansı etkilememiştir. Bu bulgular kısa-süreli konsolidasyon sürecinde dikkatin gerekliliğini desteklemektedir.
Anisotropic Effects on Topology Optimization for Additive Manufacturing in Aerospace Applications
(2025) Totuk, Onat; Akar, Samet; Özkara, Mustafa
This study investigates the effects of anisotropy on topology optimization in additive manufacturing, with a focus on aerospace applications. Topology optimization, a powerful design method for lightweight structures, is increasingly relevant in aerospace due to the adoption of additive manufacturing techniques. However, the anisotropic nature of materials used in these processes is often overlooked. This research compares isotropic and anisotropic analyses using TiAl4V and Epoxy Carbon UD Prepreg materials, examining stress distributions and optimization times. A cubic sample (40 mm) was subjected to various loading conditions, with a 10% mass retention constraint. Results demonstrate significant differences in stress levels and solution times between isotropic and anisotropic optimizations. For TiAl4V, the anisotropic analysis revealed notable variations in stress distribution and optimization times compared to isotropic assumptions. The composite material analysis further emphasized the importance of considering directional properties in optimization. Additionally, comparing aluminum and titanium components highlighted potential weight savings in certain applications. This study underscores the importance of incorporating anisotropic material properties in topology optimization for additive manufacturing, particularly in aerospace applications where weight reduction and structural integrity are critical. The findings suggest that anisotropic optimization could lead to more efficient designs and reduced computational times in specific loading scenarios.
Ankara Karum Alışveriş Merkezi’nin Kültürel Miras Olarak Değerlendirilmesi
(2024) Nalçacıoğlu, Erdem; Özmen, Ayça; Çıplak, Leyla Etyemez
Sanayi Devrimi’nin ardından bilim ve sanatta yaşanan gelişmeler kaçınılmaz olarak mimari pratiklere de yansımış, böylece mimari eserlerin biçimleri, malzemeleri, yapım yöntemleri ve işlevleri çeşitlenmiştir. Bu durum yeni yapı tipolojilerinin ortaya çıkmasına neden olmuştur. Bunlardan biri de alışveriş merkezi tipolojisidir. Dünyada 1950'lerde, Türkiye'de ise 1980'lerde ortaya çıkan alışveriş merkezleri, perakende satışın yanı sıra kültürel, rekreasyonel ve sosyal donatıların da yer aldığı mekânlardır. Yirminci yüzyılın ikinci yarısında ortaya çıkan bu alışveriş merkezi tipolojisinin yakın gelecekte kültürel miras olarak kabul edilmesi beklenmektedir. Bu çalışma, küreselleşen yaşam tarzlarını ve tüketim eğilimlerini temsil eden yeni bir yapı tipolojisinin Ankara'daki ilk özgün örneklerinden biri olan Karum Alışveriş Merkezi'ne odaklanmaktadır. Bu çalışmanın amacı, Karum Alışveriş Merkezi'ni kültürel mirasın korunması bağlamında analiz etmek, miras değerlerini ortaya çıkarmak, sorunlarını belirlemek ve sürekliliği için stratejiler önermektir.
An Approach For Extending Promethee To Reflect Choice Behaviour Of The Decision Maker
(2019) Bozkurt, Ahmet; Karasakal, Esra; Karasakal, Orhan
Bu çalışmada, karar vericinin fayda teorisi ile açıklanamayan seçim davranışını doğru bir şekilde yansıtabilmek için PROMETHEE yöntemini temel alan bir yaklaşım geliştirilmiştir. Seçim davranışı teorisi, zararların kazançlardan daha yüksek etkisinin olduğunu ileri sürmektedir. Bu teori PROMETHEE yöntemine yeni tercih fonksiyonları tanımlamak suretiyle entegre edilmiştir. Önerilen yaklaşım, davranışsal olarak gerçekçi ve karar vericinin tercihlerinde oluşabilecek geçişsiz değerlendirmelere izin veren bir yöntemdir. Kriter ağırlıklarının belirlenmesinde Analitik Hiyerarşi Süreci yaklaşımındaki ikili karşılaştırma metodu kullanılmıştır. Önerilen yaklaşımın etkinliği bir üniversite sıralama problem üzerinde gösterilmiştir.
Architectural Design Quality Assessment Based On Analytic Hierarchy Process: A Case Study(1)
(2014) Prıns, Matthijs; Topçu, Y. İlker; Gültekin, A. Tanju; Harputlugil, Timuçin
Karmaşıklığından dolayı, mimari tasarım kalitesinin değerlendirilmesi zordur. Ölçütlerin belirlenmesi, yöntemin ortaya konması ve kalitenin kimin için, kimler tarafından ve nasıl değerlendirileceği mimarlık alanında süregelen önemli tartışma konularından biridir. Bu amaçla, devam eden tasarım süreçlerine girdi veremeyen, çoğunluğu kullanım süreci değerlendirmesinde kullanılan pek çok değerlendirme aracı geliştirilmiştir. Bu yazı, tasarımın ilk aşamalarından son aşamalarına kadar kullanılabilecek Analitik Hiyerarşi Süreci (AHS) tabanlı yeni bir yöntem önermeyi amaçlamaktadır. Çok Ölçütlü Karar Verme (ÇÖKV), bireysel ve grup kararlarında soyut ve somut etkenlerin birlikte değerlendirilebildiği güçlü ve anlaşılabilir bir sistemdir. Bir ÇÖKV yöntemi olan AHP karar sorunlarını oluşturduğu hiyerarşik yapı ile tanımlar. Kalite göreli olarak değerlendirilebileceğinden, AHP tabanlı yaklaşım yapı elde etme sürecinin paydaşları gözünden süreç içerisindeki tercihlerini anlamayı amaçlamaktadır. Önerilen yaklaşım, Türkiyenin önde gelen sağlık kuruluşlarının birinde örnek olay çalışması ile sınanmıştır.
An Architectural Reading of Zamyatin’s Intersectional Elements in the Novel “we”
(2021) Çavdar, Rabia Çiğdem
“We” was written by Russian novelist Yevgeny Zamyatin in 1921 after the Soviet Revolution. To be at the edge of the conflicts was scrutinized at the novel, in which the protagonist, labeled as D-503, having a tentative position at the well-defined ground by the power which presented itself as the truth or the law. The narration was constructed via the diary of protagonist; how D-503 perceived the paradigm, which he had lived in, what kind of conflicts and contradictions he had been living with the system was questioned. Zamyatin chose very specific architectural elements to explain and criticize the dominant paradigm of the era -early 1920’s, and the periphery of that dominancy; like Green Wall, Glass Wall, logical labyrinth, cube square, and etc. These intersectional elements were constructed as in the form of blurred voids in order to unfold the ideological positions of the written period of the novel. The materialization and meaning of the walls, could be read as dialectic conceiving of how Zamyatin scrutinized both the revolution and the paradigm. As being a dystopia, the novel “We” criticizes the idealized beliefs that were presented as transparent, lucid and conductive.
Are the Transition Stock Markets Efficient? Evidence From Non-Linear Unit Root Tests
(2007) Omay, Tolga; Hasanov, Mübariz
In this paper we address efficiency of eight transition stock markets, namely, Bulgarian, Chinese, Czech, Hungarian, Polish, Romanian, Russian and Slovakian stock markets by testing whether the price series of these markets contain unit root. For this purpose we employ the nonlinear unit root test procedure recently developed by Kapetanios et al. (2003) that has a better power than standard unit root tests when series under consideration are characterised by a slower speed of mean reversion. The results of nonlinear unit root tests indicate that only Bulgarian, Czech, Hungarian and Slovakian price series contain unit root, consistent with weak form efficiency.

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