01. Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed

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Citation - Scopus: 5
18 - Acoustic and Mechanical Properties of Biofibers and Their Composites
(Elsevier, 2022) Koç, Büşra; Genç, Garip; Körük, Hasan
In this study, the acoustic and mechanical properties of many biofibers and their composites are presented. First, the sound absorption coefficients and transmission losses of commonly used natural fibers and their composites are presented, by clearly reporting the thickness of the samples, for three different frequency ranges (<500 Hz: low, 500–2000 Hz: medium, and >2000 Hz: high). In addition, the sound absorption coefficients (for low- and medium-frequency ranges) and noise reduction coefficients of some 40-cm-thick samples are overlaid in order to directly compare their performances. Second, the physical properties, such as the density, diameter, and length of biofibers, and mechanical properties, such as the damping (or loss factor) and Young’s modulus of biofibers and their composites, are presented in detail. For comparison purposes, the acoustic and mechanical properties of some conventional materials, such as carbon and glass fibers, are included in the tables and figures. Finally, the effects of some parameters, such as pretreatment, fiber diameter, fiber/matrix ratio, moisture content, manufacturing and machining parameters/techniques, and measurement conditions/methods, on the acoustic and mechanical properties of natural materials are presented. Furthermore, current applications and potential usage areas of natural fibers are briefly discussed.
Citation - Scopus: 3
19 - Identification of the Elastic and Damping Properties of Jute and Luffa Fiber-Reinforced Biocomposites
(Elsevier, 2022) Genç, Garip; Saygılı, Yusuf; Körük, Hasan; Şanlıtürk, Yusuf Kenan
Although there are many studies in the literature on the static mechanical properties of biomaterials such as tensile strength, the dynamic mechanical properties of biomaterials such as modal loss factors have not been investigated in detail. In this study, the Young’s moduli and damping (or loss factors) of some jute and luffa fiber-reinforced biocomposites are investigated. The effects of fiber/resin ratio and thickness on the mechanical properties of the jute and luffa composites are identified via an experimental approach. For this purpose, acoustic and structural frequency response functions of some homogeneous and hybrid jute and luffa composite plates with different fiber/resin ratios and thicknesses are measured. By analyzing the measured frequency response functions using the circle-fit method, the modal frequencies and loss factors of the homogeneous and hybrid composite plates are determined. By assuming that the homogeneous plates are isotropic, the same plates are modeled using the finite element method, and by comparing the experimental and theoretical natural frequencies, the elastic properties of the homogeneous plates are determined. In addition, the same homogeneous plates are modeled by considering an anisotropic material model, and the associated material properties are determined. By using the identified material properties, the finite element models of the hybrid composite plates are developed, and by comparing their experimental and theoretical natural frequencies, the identified elastic material properties are evaluated and validated.
2019 Yılında Türk Dış Politikasının Manevra Alanı Genişleyebilir
(BİLGESAM, 2019) Kibaroğlu, Mustafa
Bu yazımızda, Türkiye’nin ABD, Rusya, AB ve İran ile olan ilişkilerinde hassas bir denge yakalaması yoluyla, dış politika ve güvenlik konularında kendini daha avantajlı bir konuma getirmesine katkı yapabilecek siyasi, iktisadi ve askeri unsurları ele alacağız.
Citation - WoS: 7
Citation - Scopus: 4
2D Modeling Temperature Development of Mass Concrete Structures at Early Age
(FIB. The International Federation for Structural Concrete, 2018) Yikici, T.A.; Chen, R.H.L.
In this paper, a 2D finite volume analysis methodology was used to predict temperature development within three different bridge pier caps. MATLAB® was employed to generate a program that solves the governing heat transfer equation where development of thermo-physical concrete properties was defined as a function of degree of hydration. The rate of heat generation was obtained experimentally via adiabatic calorimetry and the activation energy was determined following the ASTM C 1074 procedure to implement equivalent age concept. 2D finite volume analysis results were presented in comparison with the recorded concrete temperatures from the field. Accordingly, temperature time histories at the center and the side surface of the bridge pier caps were predicted reasonably well using the concrete mixture information and the measured concrete hydration properties. © 2022 Elsevier B.V., All rights reserved.
A Bibliometric Analysis of Greenwashing and Firm Value
(2025) Öz, Merve; Alagöz, Hilal Merve; Menderes, Cansu Korkmaz
Purpose – Greenwashing, traditionally a marketing concept, has gained increasing relevance in economics, finance, accounting, and law. As a result, bibliometric analyses on greenwashing have attracted growing scholarly interest. This study conducts a bibliometric analysis of the literature on greenwashing and firm value, identifying key trends, productive countries, institutions, influential authors, and collaborative networks while examining the relationship between greenwashing and firm value. Design/methodology/approach – Data were collected from the Web of Science (WoS) database through systematic searches. The analysis includes 473 publications from 2003 to 2024 in disciplines such as environmental sciences, business, management, finance, communication, and ethics. Among these, 170 studies explicitly address both greenwashing and firm value. Results – The findings indicate a substantial increase in research output, particularly after 2020, with nearly 50 publications per year by 2023. Sustainability, performance evaluation, and transparency emerge as dominant themes. While China leads in research output, European countries exhibit higher collaboration rates. Influential authors, such as Li W and Zhang D, and leading journals, including the Journal of Business Ethics, have significantly shaped the field. Thematic developments indicate a shift from management-centered discussions to a stronger emphasis on sustainability and financial performance. Discussion – The study provides theoretical and practical insights into the impact of greenwashing on firm value, offering implications for managers, stakeholders, policymakers, and researchers. While greenwashing remains a relatively new research area, its scholarly attention is expanding rapidly. This study contributes by examining both greenwashing and its financial implications, particularly how stakeholders perceive greenwashing and its effects on firm value.
A Comparative Analysis on the Relationship Between Institutional Environment and Entrepreneurship in Emerging Economies
(2018) Karadağ, Hande
Institutional environment plays an important role in the quality and nature of entrepreneurial activities and the development of entrepreneurship ecosystem. The aim of this research is to evaluate institutional factors of selected emerging markets with Global Entrepreneurship and Development Index data. Findings of the study indicate that Turkey has one of the lowest scores among other emerging markets for the institutional variable of staff training and also has comparably low scores in venture capital, business strategy, and technology transfer. Results of the study show that except South Korea, all the selected economies have scored low on the institutional variable of gross domestic expenditure on research and development as a percentage of the gross domestic product. The study is expected to make valuable contributions to the literature with its novel approach of using comparative Global Entrepreneurship and Development Index scores for analyzing the institutional environment and entrepreneurship relationship in emerging economies.
Citation - Scopus: 4
A Framework for Automatic Generation of Spoken Question-Answering Data
(Association for Computational Linguistics (ACL), 2022) Manav, Y.; Menevşe, M.Ü.; Özgür, A.; Arısoy, Ebru
This paper describes a framework to automatically generate a spoken question answering (QA) dataset. The framework consists of a question generation (QG) module to generate questions automatically from given text documents, a text-to-speech (TTS) module to convert the text documents into spoken form and an automatic speech recognition (ASR) module to transcribe the spoken content. The final dataset contains question-answer pairs for both the reference text and ASR transcriptions as well as the audio files corresponding to each reference text. For QG and ASR systems we used pre-trained multilingual encoder-decoder transformer models and fine-tuned these models using a limited amount of manually generated QA data and TTS-based speech data, respectively. As a proof of concept, we investigated the proposed framework for Turkish and generated the Turkish Question Answering (TurQuAse) dataset using Wikipedia articles. Manual evaluation of the automatically generated question-answer pairs and QA performance evaluation with state-of-the-art models on TurQuAse show that the proposed framework is efficient for automatically generating spoken QA datasets. To the best of our knowledge, TurQuAse is the first publicly available spoken question answering dataset for Turkish. The proposed framework can be easily extended to other languages where a limited amount of QA data is available. © 2022 Association for Computational Linguistics.
A Historical Perspective To Fabrication in Architecture for Preserving Heritage
(Education and research in Computer Aided Architectural Design in Europe, 2019) Özgan, Sibel Yasemin; Özkar, Mine; Hamzaoğlu, Begüm
Digital technologies have recently been at the forefront of the causal link between making and design. A growing number of architecture programs of universities incorporates fabrication to the educational environment, and even to the curriculum. Fabrication technology is now considered among the set of tools students are expected to acquire a basic knowledge of and skills in. Nevertheless, the pedagogical potential of fabrication in communicating traditions of making is underused in an oversight of the continuity of the relevant know-how. Our position is that traditions of making can be the subject matter of fabrication with the objective to remedy the role of fabrication tools in architectural history, sustainable architectural production, and in the field of digital heritage. In this paper, we report on two comparative studies that illustrate how the instrumental factors of two historical crafts can be articulated using fabrication. © 2019, Education and research in Computer Aided Architectural Design in Europe. All rights reserved.
Citation - Scopus: 1
A Microwave Imaging Scheme for Detection of Pulmonary Edema and Hemorrhage
(IEEE, 2022) Ertek, Didem; Kucuk, Gokhan; Bilgin, Egemen
The microwave imaging systems have the potential to present a cost effective and less hazardous alternative to conventional medical imaging techniques. In this paper, a Contrast Source Inversion method based microwave imaging scheme is proposed and tested for the detection of pulmonary edema and hemorrhage. To this end, a realistic human torso phantom is used, and the electromagnetic parameters of the human tissues is determined via Cole-Cole model. The scattered field is simulated via Method of Moments at the operating frequency of 350 MHz, and a 50 dB white Gaussian noise is added to model a realistic measurement setup. The numerical tests performed with the proposed technique suggest that the method can be used to locate the pulmonary edema and hemorrhage, and it is capable of distinguishing these two medical conditions successfully.
A Practical PCB-Based Framework for Spiking Neural Networks with a Half-Adder Example
(IEEE, 2025) Cikikci, Sevde Vuslat; Orek, Eren; Aysoy, Ayhan; Ozgen, Ali Kagan; Yavuz, Arda; Ayhan, Tuba
This paper addresses the half-adder problem using Spiking Neural Networks (SNNs). In a previous study, the XOR operation was successfully realized on a breadboard and in this study it is integrated into the half-adder structure. The system uses input signals at frequencies of 50 Hz and 100 Hz and the neurons are generated by the Leaky Integrate and Fire (LIF) model. Unlike other neuron models, the LIF model is less complex. In addition, it was preferred because of its biological meaningfulness compared to the Integrate and Fire model. The network, consisting of 18 neurons in total, shows that basic arithmetic operations can be performed with SNN. Overall, this study demonstrates that basic logic operations can be implemented in neural networks, thus providing new perspectives for digital calculation. The successful solution of the Half Adder problem using SNNs not only proves the calculation capabilities of SNNs, but also opens new perspectives for the development of more complex logical circuits using these biologically inspired neural circuits.
Citation - Scopus: 1
A Ran/Sdn Controller Based Connectivity Management Platform for Mobile Service Providers
(Institute of Electrical and Electronics Engineers Inc., 2017) Ayhan, Gökhan; Koca, Melih; Zeydan, Engin; Tan, A. Serdar
In this demo, we demonstrate the integration of radio access network (RAN)/Software-Defined Networking (SDN) controller with a connectivity management platform designed for mobile wireless networks. This is an architecture designed throughout the EU Celtic-Plus project SIGMONA1. OpenDaylight based RAN/SDN controller and the application server are capable of collecting infrastructure and client related parameters from OpenFlow enabled switches and Android based phones respectively. The decision on the best access network selection is computed at the application server using a Multiple Attribute Decision Making (MADM) algorithm and instructed back to Android-based mobile client for execution of access network selection. © 2017 IFIP.
A Resonator Design For Mutual Coupling Reduction Between Microstrip Antennas In Mımo Applications At 28 Ghz
(Institute of Electrical and Electronics Engineers Inc., 2024) Gollu, A.A.; Polat, B.; Semerci, D.; Bilgin, E.
A simple resonator structure is proposed to reduce the mutual coupling between rectangular microstrip patch antennas positioned close to each other for MIMO applications at 28 GHz center frequency. Here, the frequency of 28 GHz is chosen because it is one of middle bands for 5G communication in USA. Two microstrip patch antennas with gaps using a common dielectric substrate and a ground plane are employed as antennas and the patches are closely placed with an edge-to-edge distance of 0.6 mm (approximately λ/18). In order to reduce the mutual coupling between these radiating elements and increase the isolation, a resonator is positioned between them and its parameters are optimized. In the simulations, it is observed that the proposed resonator reduces the coupling by approximately 10 dB. By this result, it can be concluded that the proposed structure may be suitable for tightly packed MIMO systems. © 2024 IEEE.
A Strategic Management Approach To Financial Management Practices in Small and Medium Sized Businesses
(Emerald Group Publishing Ltd., 2015) Karadağ, Hande
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Citation - Scopus: 2
A Visualization Platfom for Disk Failure Analysis
(IEEE, 2018) Arslan, Şuayb Şefik; Yiğit, İbrahim Onuralp; Zeydan, Engin
It has become a norm rather than an exception to observe multiple disks malfunctioning or whole disk failures in places like big data centers where thousands of drives operate simultaneously. Data that resides on these devices is typically protected by replication or erasure coding for long-term durable storage. However, to be able to optimize data protection methods, real life disk failure trends need to be modeled. Modelling helps us build insights while in the design phase and properly optimize protection methods for a given application. In this study, we developed a visualization platform in light of disk failure data provided by BackBlaze, and extracted useful statistical information such as failure rate and model-based time to failure distributions. Finally, simple modeling is performed for disk failure predictions to alarm and take necessary system-wide precautions.
Citation - Scopus: 1
Adaptive Boosting of Dnn Ensembles for Brain-Computer Interface Spellers
(IEEE, 2021) Çatak, Yiğit; Aksoy, Can; Özkan, Hüseyin; Güney, Osman Berke; Koç, Emirhan; Arslan, Şuayb Şefik
Steady-state visual evoked potentials (SSVEP) are commonly used in brain computer interface (BCI) applications such as spelling systems, due to their advantages over other paradigms. In this study, we develop a method for SSVEP-based BCI speller systems, using a known deep neural network (DNN), which includes transfer and ensemble learning techniques. We test performance of our method on publicly available benchmark and BETA datasets with leave-one-subject-out procedure. Our method consists of two stages. In the first stage, a global DNN is trained using data from all subjects except one subject that is excluded for testing. In the second stage, the global model is fine-tuned to each subject whose data are used in the training. Combining the responses of trained DNNs with different weights for each test subject, rather than an equal weight, provide better performance as brain signals may differ significantly between individuals. To this end, weights of DNNs are learnt with SAMME algorithm with using data belonging to the test subject. Our method significantly outperforms canonical correlation analysis (CCA) and filter bank canonical correlation analysis (FBCCA) methods.
Adi Konkordatoda Çekişmeli Alacaklar Hakkında Dava (iik M. 308/b)
(Türkiye Barolar Birliği, 2021) Yazıcı, Çiğdem
Alacağı çekişmeli hale getirilen alacaklı, İcra ve İflâs Kanunu’muzun 308/b maddesi hükmüne göre alacağının maddî hukuk hükümlerine göre belirlenmesi amacıyla konkordatonun tasdiki kararının ilânı tarihinden itibaren bir ay içinde dava açabilir. Ayrıca tasdik kararını veren mahkeme, konkordato projesi uyarınca çekişmeli alacaklara isabet eden payın, kararın kesinleşmesine kadar borçlu tarafından mahkemece belirlenen bir bankaya yatırılmasına karar verebilir. Alacaklı süresi içinde dava açmazsa, kendisi için ayrılmış paydan ödeme yapılmasını talep edemez. Bu çalışmada çekişmeli alacaklar hakkında açılacak davanın özellikleri ele alınacaktır.
Adın Ne Değeri Var? Evliliğin Kadının Soyadına Etkisi
(Legal Hukuk, 2017) Başoğlu, Başak
Türk pozitif hukukunda ailede ad birliğini sağlama amacıyla ortak soyadı olarak kocanın soyadı belirlenmiş, buna bağlı olarak hem evlenen kadının hem de evlilik içinde dünyaya gelen çocuğun aile soyadı olarak belirlenen kocanın/babanın soyadını taşıyacağı düzenlenmiştir. Bir başka deyişle Türk hukukunda kadının soyadı evlilik ile değişerek kocasının soyadına, dolayısıyla onun soyuna, kimliğine, statüsüne tabi kılınmıştır. Ancak bu düzenleme oldukça tartışmalıdır ve hatta bu ilk derece mahkemelerinin, Yargıtay'ın, Anayasa Mahkemesi'nin ve hatta İnsan Hakları Avrupa Mahkemesi'nin çeşitli kararlarına konu olmuştur. Söz konusu yargı kararları ışığında durum daha da tartışmalı bir hal almıştır. Şüphesiz evliliğin kadının soyadına etkisine ilişkin tüm sorunların ve tartışmaların çözümü pozitif hukukun değiştirilmesinden geçeceğinden bu çalışma ile amaçlanan olası bir pozitif hukuk değişikliğine ışık tutmaktır.
Adli Para Cezasının Bireyselleştirilmesinde Bir Gün Karşılığı Para Miktarından Kaynaklanan Sorunlar
(Seçkin Yayıncılık, 2016) Çınar, Ali Rıza
Para cezası, suç karşılığı olarak yasada öngörülen sınırlar arasında belirlenerek, hükümlüden alınan bir miktar paranın, yasanın belirlediği yere (devlet hazinesine) ödenmesidir.Para cezası en eski cezalardandır. Bölünebilmesi nedeniyle para cezaları, bireyselleştirmeye çok yatkın bir ceza türünü oluşturmaktadır. Adli hata durumunda onarımı olanaklıdır. Para cezasının olumsuz nitelikleri de bulunmaktadır. Para cezası, ekonomik durumları birbirinden farklı insanlarda çok değişik etkiler yapar. Böylece de cezalarda yasallık ve eşitlik ilkesine aykırı sonuçlar doğurur. Çağdaş ceza hukukunda, bu sakıncaları giderici sistem ve yöntemler saptanarak uygulanmaktadır.Para cezalarının belirlenmesinde 765 sayılı Türk Ceza Yasası klasik sistemi benimsemişti. Bu sistemde yargıca alt ve üst sınırlar arasında bir ceza belirleme konusunda takdir yetkisi verilmişti. Klasik para cezası sistemine yönelik olarak bu sistemin eşitlik ilkesine uygun olmadığı zengin ve yoksul hükümlüler üzerinde aynı etkiyi göstermediği ileri sürülmüştür. Ayrıca bu sisteme yönelik önemli bir eleştiri ise yüksek enflasyon nedeniyle Türk parasının değerindeki düşmeden dolayı zaman içerisinde para cezasının caydırıcılığını yitirmesiydi.Bu sakıncaları gidermek amacıyla Türk hukukunda yeni 5237 sayılı Türk Ceza Yasası'yla gün para cezası sistemine geçilmiştir. Türk Ceza Yasası'nda adli para cezasını düzenleyen hükümle ilgili gerekçede, "Gün para cezası sisteminin temel amacı, para cezasının kişinin ödeme gücüne göre belirlenmesi yoluyla, suç işleyen zengin ile fakir arasındaki eşitsizliği gidermektir" denilmektedir. Bundan dolayı da ödeme gücü olan kişi üzerinde etkisi olmayan, ödeme gücü olmayanın ise sonuçta yine infaz kurumuna gönderilmesini sonuçlayan "klasik para cezası" sisteminden vazgeçilerek, "gün para cezası" sistemine geçildiği belirtilmektedir.Türk Ceza Yasası'nın "Adli Para Cezası" ile ilgili hükmün gerekçesinde açıklananlara katılıyoruz (m.52). "Gün para cezası" sisteminin benimsenmesi de yerindedir.Ancak "bir günün parasal miktarı" için öngörülen alt ve üst sınırlara göre, gerekçede açıklananların gerçekleştirilme olanağı bulunmamaktadır. Çünkü Yasamızda, bir gün karşılığı birim para cezasının üst sınırının parasal miktarının alt sınırın beş katı olarak düzenlendiğini görmekteyiz. Halbuki alt ve üst sınırlar arasında oran (makas) arttıkça, para cezasının bireyselleştirilmesi, bölünebilmesi daha olanaklı duruma gelecektir. Ayrıca enflasyon nedeniyle para değerindeki düşmeden dolayı kaynaklanacak sakıncalar da önlenmiş olacaktır. Böylece cezanın genel ve özel önleme etkisi de gerçekleştirilecektir.Gerekçede açıklananların gerçekleşebilmesi ve çalışmamızın konuyla ilgili bölümlerinde ayrıntılı olarak açıkladığımız sorunların yaşanmaması için "bir günün parasal miktarının" yasadaki alt sınırı mümkün olduğunca az, üst sınırı ise yüksek öngörülmelidir.
Aile Hukukunun Özellikleri, İlkeleri ve Gelişimi
(İstanbul Kültür Üniversitesi, 2016) Kapancı, Kadir Berk; Serozan, Rona; Başoğlu, Başak
Aile Hukuku, sağlıklı ve huzurlu bireyler arasındaki ilişkiler söz konusu olduğunda müdahalenin mümkün olduğunca az olması gereken “minimalist” bir hukuk dalıdır. Bununla birlikte, Aile Hukuku ilişkilerin ve özellikle ailedeki zayıf bşireylerin korunması gerektiğinde de müdehale kaçınılmazdır.
An Analytic Look at a Language Course Design Model
(2017) Mutlu, Gülçin; Ece Sarıgül
This study aims to qualitatively examine and elaborate on the characteristics of the course design model devised by Graves (2000). Drawing upon the traditional components and principals of instructional design, Graves' course design model is innovative or different in that it has been more specially developed for language course design purposes and thus is believed to be more suited to the nature of language courses with its consideration of the main elements or characteristics of language teaching and learning processes. This descriptive study centers upon the seven main examination criteria, which are in fact the main procedures as suggested by Graves (2000). These are a) defining context, b) conceptualizing content, c) organizing the course, d) formulating goals and objectives, e) assessing needs, f) developing materials and finally g) designing an assessment plan. In this essence, each criterion was first introduced and explained in detail before the researchers extend their critical outlook into the functionality and practical use of the relevant steps and strategies recommended by Graves (2000). This critical analysis and review on the Graves' course design model revealed that the model employs the traditional components of the ADDIE generic and lends itself well also to be used in the other disciplines other than foreign languages. The final part of this report will provide suggestions as regards the potential application of the model specifically in English language curriculum development and more broadly in the curriculum and course development procedures pertaining to other discipline areas.

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