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Identification of the viscoelastic properties of soft materials using a convenient dynamic indentation system and procedure
No full textThe responses of soft structures such as tissue depend on their viscoelastic properties. Therefore, the knowledge of the elastic and damping properties of soft materials is of great interest. This paper presents the identification of the viscoelastic properties of soft materials using a convenient dynamic indentation system and procedure. Using an electromagnet, a force is applied to a rigid sphere located at the soft-material interface and the dynamic response of the sphere is recorded using a high-speed camera. The recorded video is processed to identify the displacement of the sphere as a function of time. The dynamic response of the sphere located at the soft-material interface is predicted using an analytical model that considers the shear modulus and density of the soft sample, the radiation damping due to shear waves, and the radius and density of the sphere. By matching the measured and predicted steady-state displacements of the sphere, the shear modulus of the soft sample is determined. The viscous damping ratio of the soft sample is identified by using an equivalent viscous damping ratio for the soft sample in the analytical model and matching the measured and predicted oscillation amplitudes of the sphere. Experiments and analyzes are performed using gelation phantoms with different mechanical properties, spheres of different materials and sizes, and different force levels to verify the system and procedure. Three experiments are performed for each gelation phantom, sphere, and external force, and the repeatability of the results is presented. The results show that the dynamic indentation system and procedure presented in this study can be conveniently used to determine the viscoelastic properties of soft materials in practical applications.WOS:0007976001000222-s2.0-85130221971Conference Proceedings Citation IndexProceedings PaperUluslararası işbirliği ile yapılmayan - HAYIRYÖK - 2021-22Oca
Extension of capital budgeting techniques using interval-valued Fermatean fuzzy sets
No full textCapital budgeting requires dealing with high uncertainty from the unknown characteristics of cash flow, interest rate, and study period forecasts for future periods. Many fuzzy extensions of capital budgeting techniques have been proposed and used in a wide range of applications to deal with uncertainty. In this paper, a new fuzzy extension of the most used capital budgeting techniques is proposed. In this content, first interval-valued Fermatean fuzzy sets (IVFFS s) are defined, and the algebraic and aggregation operations are determined for interval-valued Fermatean fuzzy (IVFF) numbers. The formulations of IVFF net present value, IVFF equivalent uniform annual value, and IVFF benefit-cost ratio (B/C) methods are generated. To validate the proposed methods, proposed formulations are illustrated with a hypothetical example, and the results are compared with classical fuzzy capital budgeting techniques.WOS:0007413639000272-s2.0-85122820808Science Citation Index ExpandedArticleUluslararası işbirliği ile yapılan - EVETJanuaryYÖK - 2021-22Oca
Teacher educators in k-12 classrooms: how to nurture professional development and research
No full textFour mathematics teacher educators taught 5th grade mathematics for one year at a disadvantaged public school in a metropolitan city in Turkey. Teacher educators (TE) met every week for 10 months where they discussed what to teach, how to teach and reflected on implementation of their shared planning (Regular Meetings). In some meetings, there was a special focus on teaching and learning of fractions (Fraction Research Meetings). Videotapes of the first six Regular Meetings and six of the Fraction Research Meetings were analyzed. The focus of qualitative analyses was on how the pedagogical content knowledge (PCK) was constructed during meetings. References evidencing TEs' knowledge of students, instructional strategies and assessment were revealed more frequently during the Fraction Research Meetings compared to the Regular Meetings. Findings showed that TEs were more focused on what questions to ask in the classroom and shared their experiences about students' mathematical thinking more frequently. Framing planning and reflection discussions with a focus on conducting research was a productive way of nurturing professional development for TEs.
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No full textKH00040MEF Kütüphane bilişim ve iletişim teknolojileri birim sorumlusu Ramazan Çelik, 18/06/2021 tarihinde ÜNAK/TKD çevrimiçi staj programı kapsamında Marmara Üniversitesi Bilgi ve Belge Yönetimi bölümü öğrencilerine “MEF Üniversitesi Kütüphanesi Kurumsal Akademik Arşiv Sistemi “DSpace” Uygulama Örneği” başlıklı eğitimi verdi.Nisa
Kripto varlıklar üzerinde rehin hakkı kurulabilir mi?
No full textBlokzincir üzerinde var olan dijital unsurlar olarak görülebilecek kripto varlıklar farklı alt türlere ayrılmakta ve kimi zaman yüksek ekonomik değerleri haiz olabilmektedirler. Bu varlıkların hukuki bakış açısıyla nitelendirilmesi, onlarla yapılabilecek işlemler düşünüldüğünde önem arz eder. İlgili bağlamda kripto varlık denilince karşımıza tekil ve homojen bir yapı çıkmayacağından çeşitli ayrımlar yapılarak sonuçlara ulaşılmalıdır. Diğer taraftan rehin hakkı, eşya hukukundaki klasik ayni teminat haklarından biri olarak karşımıza çıkar. Belirli bir hak veya eşya üzerinde kurulan bu hak, belirli bir (asıl) alacağı teminat altına alır ve hak sahibine, bu (asıl) alacak karşılanmadığı vakit ilgili hak veya eşyayı paraya çevirerek teminat altına alınan alacağın karşılanması yetkisini bahşeder. İşbu çalışmamızın amacı, farklı kripto varlık türleri üzerinde rehin hakkı kurulabilmesinin mümkün olabilip olmadığı sorusunun cevabını bulmaya odaklanmaktadır.Aralı
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No full textKH00105MEF Kütüphane Direktörü Ertuğrul Çimen, İstanbul Üniversitesi’nin ev sahipliğinde, 26/03/2018 tarihinde gerçekleşen “Geleceğin Dijital Okuru” başlıklı panelde moderatör olarak yer aldı.Mayı
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No full textKH00098MEF Üniversitesi Kütüphanesi Kullanıcı Hizmetleri Kütüphanecisi İpek Yarar ve MEF Üniversitesi Kütüphanesi Bilişim ve İletişim Teknolojileri Birim Sorumlusu Ramazan Çelik, 08/10/2018 tarihinde Koç Üniversitesi Suna Kıraç Kütüphanesi’nde düzenlenen Greek-Turkish Library Staff Week’e MEF Kütüphane adına katılım sağladı.Mayı
İş hukuku (2022)
No full textÖzellikle öğrencilerin ders notu gereksinimini karşılamaya yönelik hazırlanan kitapta konular genel hatlarıyla ama özlü biçimde incelenmiş, geniş bilgi için başvurulacak kaynaklar dipnotlarda belirtilmiştir. Bu yapılırken de çoğu kez Türk yargı kararlarına, ulaşılabilen en son tarihli örnekleriyle yer verilmiştir. Böylece açıklamalar soyut düzeyden somuta indirgenmiş ve iş hukukunun uygulamada nasıl algılandığı ortaya konulmuştur. Kitapta önceki basıdan bu yana mevzuat/uygulama ve öğretideki son gelişmelere de işaret edilmiştir.Eylü
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No full textKH00110MEF Kütüphane Direktörü Ertuğrul Çimen, 25/11/2017 tarihinde gerçekleşen Gelecek için Bilgi GIB17 Çalıştayı’nda “Uzaktan Eğitim ile Bilgi İhtiyacının Karşılanması” başlıklı oturumda başkan ve konuşmacı olarak yer aldı.Mayı
Steel Surface Defect Classification Via Deep Learning
No full textDeep learning and image processing methods have taken place in many parts of our lives, as well as in the quality control stages of production lines. The aim of this study is to train and use a deep learning model to improve quality management using limited data and computing power. To achieve that, deep learning for quality control models were trained by classifying six different steel surface defect images in the NEU-DET dataset. Xception, ResNetV2 152, VGG19 and InceptionV3 architectures were used to train the model. High accuracy was obtained with both Xception and ResNetV2 152. © 2022 IEEE.2-s2.0-8514188110