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ENSTİTÜLERİzmir Katip Çelebi Üniversitesi Kurum Koleksiyonu
ENSTİTÜLERİzmir Katip Çelebi Üniversitesi Kurum Koleksiyonu
Erişime Açık

Automatic Detection of Alzheimer’s Disease with Transfer Learning and Image Processing Techniques

Atılay Yeşilada

Alzheimer's disease continues to be a serious public health issue. Alzheimer's disease affects generally old people, and it is a neurological disorder. The most significant sign of Alzheimer's disease is memory loss, which becomes worse over time. Therefore, early identification of Alzheimer's illness can aid in diseased getting the proper care. One of the aims of this thesis is to automate the early detection of Alzheimer's disease and create a self-improving system by utilising previous experiences each time it is detected automatically. In this way, the bad effects of the disease due to the ...Daha fazlası

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Investigation of the Effect of Electrode Material on Antibacterial Activity in Plasma Treatment with Dielectric Barrier Discharge

Merve Gül

Plasma is an ionized gas generated under an electric field that contains photons, free electrons, ions, free radicals, and reactive oxygen/nitrogen species (RONS). Cold atmospheric plasma (CAP) is generated in the cold form under a high electric field at atmospheric pressure. CAP is generated using two methods, Dielectric Barrier Discharge (DBD) and plasma jet. In the DBD method, the electrode configuration, shape, material, and substance from which the dielectric barrier is made are important. Beyond the electrode design and geometry, the barrier and electrode materials can also impact the re ...Daha fazlası

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Surface Roughness Performance Related to the Direction in Composite Structures Produced by the Fused Filament Fabrication Method and Improve to Surface Roughness

Özlem DOĞRU

Additive manufacturing is used today in different industries to produce prototypes and even final products. Additive manufacturing offers solutions for the fabrication of complex geometries and is preferred for manufacturing parts in a wide variety of applications. The fused filament fabrication (FFF) method is the additive manufacturing method with the most users worldwide. With the developing material science, it has been possible to produce composite structures and even metal products by going beyond the production of pure polymers in the FFF method. The mechanical properties of the materia ...Daha fazlası

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Aging Heat Treatment of Additive Manufacturing Maraging Steels in Nitrogen Containing Atmospheres

Derya Çakan

Additive Manufacturing (AM) is a manufacturing method that pushes the limits of imagination and eliminates the question of whether complex industrial products can be produced that cannot be obtained with traditional manufacturing methods. In this study, microstructure and mechanical properties of maraging steels produced by DMLS method and aged in different durations (6 and 9 hours) and atmospheres (Air, N2 and N2/H2) were investigated. When the SEM images were examined, it was ob-served that the molten pool boundaries did not disappear completely but became blur-red with increasing temperatur ...Daha fazlası

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Development of Electromagnetic Wave Absorption Properties of Graphene-Based Nanocomposites by Using Stochastic Optimization Methods

Kemal Bartu Aydın

Today, with the developing telecommunications and electronic technologies for civilian and military purposes, electromagnetic (EM) applications have a wide usage area, including different frequency ranges, such as radar, wireless information transfer, and medical technologies, as well as radio frequencies. However, the broad use of these technologies causes EM wave pollution, so they have a devastating effect not only on the working functionalities of electronic devices but also on human health. Therefore, the need to develop these technologies to prevent EM wave pollution is increasing daily. ...Daha fazlası

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Enhanced Anti-Cancer Photodynamic Activity with Photobiomodulation Therapy at Different Wavelengths

Büşra Sirek

Photodynamic therapy (PDT) is a non-invasive therapy that induces photochemical reactions for treating many diseases including cancer using the advantages of light. It is based on the interaction of light at a specific wavelength and light-sensitive chemical which does not have dark toxicity. Thus, PDT is an anticancer therapeutic modality yielding cancer cell death. As with other anticancer therapies, some drawbacks reduce or limit the efficacy of PDT. To eliminate the disadvantages resulting in increased efficacy of PDT, it is combined with other anticancer treatment methods. Together use of ...Daha fazlası

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Citizen Design Science in the Context of Crowd-Creative Design Practices: Case of Izmir

Pelin Özden

Citizen Design Science is the new co-design strategy for urban systems through active design tools with the help of citizens' observation, experience, and local knowledge, which improves the planning, design, management, and regeneration of cities, urban living spaces, public spaces, and buildings. The approach combines the opportunity of crowdsourcing ideas, concerns, and knowledge by citizens on urban spaces. Urban planning and design need to be human-centered by understanding citizens’ experiences, concerns, and wishes for urban spaces. In the resilient city target, it is important t ...Daha fazlası

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Recycling of Ti-6Al-4V Alloy Chip and Its Potential Uses in Polymer Composites

Erdoğan Teke

Artan dünya nüfusu beraberinde hammadde ihtiyacının artmasına sebep olmaktadır. Bu nedenle, kullan-at kültürüne sahip doğrusal bir ekonomiden, atık plastiklerin verimli bir şekilde yeniden kullanıldığı döngüsel bir ekonomiye geçiş zorunludur. Döngüsel ekonomi kaynakların onarıcı kullanımı yoluyla israfı ortadan kaldırmayı amaçlamaktadır. Bu tezin amacı, Ti-6Al-4V atıklarının mekanik öğütme yöntemiyle toz haline dönüştürülmesi, geri dönüştürülmüş Ti-6Al-4V tozlarının takviye malzemesi olarak araştırılması, epoksi ve polyester kompozit özelliklerinin geliştirilmesine dayanmaktadır. Bu te ...Daha fazlası

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Dynamics of Axisymmetric Drops Impacting onto Heterogeneous Surfaces

Atalay SEÇER

The way a droplet behaves when it lands on a surface depends on the characteristics of the surface and the flow conditions of the droplet. It can deposit, rebound, splash, etc. There is delimited research on how surface roughness and chemical composition affect the deformation of droplets upon impact, in comparison to the studies done on smooth surfaces. Our model uses two-phase flow to simulate the axisymmetric motion of droplets over surfaces with heterogeneities by combining the Navier-Stokes equations for motion with the Cahn-Hilliard equation for tracking the phase-field. We integrate the ...Daha fazlası

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Controlling the Motion of Capillary Driven Interfaces in Channels with Chemical Heterogeneity

Mehmet Alptuğ Boylu

The use of self-driven fluids (e.g., droplets, capillary flows) attracts many researchers as the external driving mechanisms are diminished or eliminated. The contact angle hysteresis generates a driving force (a pressure difference across interfaces). This pressure depends on the interaction with the solid substrates and is controlled if one varies the surface energy of the walls. Self-transport and manipulation of interfaces play an important role in the development of microfluidic devices, self-cleaning, water harvesting and heat transfer enhancement. In this study, we search for the effect ...Daha fazlası

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Exploring the Impact of Different Potential Update Rules on the Performance of Spiking Neural Networks

ELİF SENA ÖZCAN

Son yıllarda, spiking sinir ağlar (SNN'ler), gerçek nöronların faaliyetini taklit edebilme yetenekleri nedeniyle popülerlik kazanmış ve geniş bir makine öğrenimi uygulama yelpazesine uygun hale gelmiştir. Bu çalışmada, farklı potansiyel güncelleme kurallarının SNN'lerin COVID-19 sınıflandırması için performansına olan etkisini araştırıyoruz. COVID-19 pandemisi, sağlık sistemine eşi benzeri görülmemiş zorluklar getirmiş olup, hastalığın yayılmasını kontrol etmek için erken teşhis önemlidir. CT tarama görüntüleme, hastalıkla ilişkili akciğer anormalliklerini gösteren yüksek çözünürlüklü görüntül ...Daha fazlası

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Influence of Lignocellulosic Fillers and Interfaces on Thermal and Mechanical Properties of Biocomposites

MUSTAFA ÖNCÜL

Bu tez çalışması temel olarak beş ana bölümden oluşmaktadır. Çalışmanın birinci bölümünde daha önce çalışılmamış alternatif lignoselülozik dolgu malzemelerinin özellikleri araştırılmıştır. Bu malzemelerin selüloz, hemiselüloz ve lignin oranları kimyasal kompozisyon analiziyle, molekül yapısındaki bağların tanımlanması Fourier dönüşümlü kızılötesi (FTIR) spektroskopisiyle, kristallografik özellikleri Xışını kırınım (XRD) analiziyle, termal kararlılıkları termogravimetik analiz (TGA) ile ve morfolojik özellikleri taramalı elektron mikroskobu (SEM) kullanılarak incelenmiştir. Böylece budama atığı ...Daha fazlası

6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.

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