Elektrik - Elektronik Mühendisliği Bölümü Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/202
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Research Project Mikro Şebeke Dizaynı, Geliştirilmesi Ve Gösterilmesi(TUBİTAK, 2020) Önen, Ahmet; Alan, İrfan; Alboyacı, BoraBu projede Malta da bulunan MCAST (ve daha sonra eklenen Yunanistan da bulunan_x000D_ CERTH araştırma merkezi kampüsünün) üniversitesinin elektrik şebekesini mikro şebeke_x000D_ olarak çalıştırılması konusunda yapılan simülasyonlar ve bu simülasyonların şebekede ki_x000D_ sonuçları gösterilmektedir. Proje de sekonder ve tersiyer kontrol metotları geliştirilerek mikro_x000D_ şebeke optimum işletilmesi amaçlanmıştır. Bu metotlar şebeke bağlantı modundan ada moda_x000D_ geçişlerin başarılı bir şekilde yapılmasından, işletme maliyetini minimuma indirilmesine ve yan_x000D_ hizmetlere sunulan faydaları içermektedir. Bu metodlar geliştirilirken mikro şebekenin_x000D_ davranışı analiz edilmiş ve kesikli ve belirsiz PV entegrasyonuna göre adepte edilerek_x000D_ güncellenmiştir. Pv lerin kesikli ve belirsiz davranışı depolama sistemlerinin durumu, dizel_x000D_ jeneretörlerin varlığı, yüklerin kontrol edilibilir/edilemez olması gibi birçok değişken de dikkate_x000D_ alınarak reel zamanda cevap veren kontrolcülerin geliştirildiği bir çalışma olmuştur. Reel_x000D_ zaman da çalışabilen kontrolcü tasarımında hem MATLAB araçları geliştirilmiş hemde GAMS_x000D_ ortamında da optimizasyon sonuçları ile karşılaştırılmıştır. Bu projenin gerek ülkemiz için_x000D_ gerekse tüm mikro şebeke geliştiricilere örnek olacağı düşünülmektedir. Proje kapsamında bir_x000D_ yüksek lisans tezi, bir tam ve bir de kısmi doktora öğrencisi destklemesi ve birde post-doc_x000D_ araştırmacı için ise temel teşkil etmesi açısından da akademik boyutta istenilen hedeflere_x000D_ ulaşılmıştır.Research Project Kolon Polipleri için Kolonoskopi ve Histopatoloji Görüntülerinden Yapay Zekâ Destekli Prognostik Belirteç Tespiti(ELEKTRİK, ELEKTRONİK VE ENFORMATİK ARAŞTIRMA DESTEK GRUBU GRUBU: EEEAG, 2023) Yılmaz, Bülent; Akay, Ebru; Doğan, Serkan; Aydın, Zafer; Dogan, Refika Sultan; Yengec-Tasdemir, Sena Busra; Güzel, Ömer FarukKolon kanseri vakalarının çoğu kolon mukozasında anormal hücre çoğalmasından kaynaklanan poliplerle başlar. Bu projede Kayseri Şehir Hastanesi gastroenteroloji kliniğine gelen 201 hastada tespit edilen poliplere dair kolonoskopi video ve görüntülerinden ve biyopsi örneklerinden elde edilen patoloji raporu ve immunohistokimyasal (İHK) gen ve protein analizi sonuçlarını içeren kapsamlı bir veri seti oluşturulmuştur. Bu projede, elde ettiğimiz veri setinde yer alan görüntülerden kolon poliplerinin evresini/patolojisini tahmin etmek için yenilikçi derin öğrenme ve makine öğrenmesi yöntemlerini temel alan çevrim içi veya dışı kullanılabilen kapsamlı bir yapay zekâ destekli bilgisayarlı görü sistemi geliştirilmiştir. Bu proje kapsamında; kolonoskopi videolarından gerçek zamanlı polip lokalizasyonu, videolardan görüntülerin elde edilmesi, polip görüntülerinden hiperplastik ve tübüler polip ayrımının otomatik yapılması ve hekim performansıyla karşılaştırılması, bu görüntüler üzerinde ayırt edici özniteliklerin tespit edilmesi, farklı büyütmelerde alınan histopatoloji görüntülerinden adenomatöz olan ve olmayan poliplerin ve poliplerin alt tiplerinin yenilikçi derin öğrenme yöntemleriyle tespiti, Ki-67, p53, VEGF, PDL-lenfosit ve PDL-epitel, BRAF ve cd34 isimli gen ve proteinlerin İHK analizlerinin sonuçlarının polip tipleri ve alt tipleri için yorumlanması ve poliplerin bu bilgilere göre etiketlenmesi gerçekleştirilmiştir.Research Project Elektromanyetik Levitasyon ile Çalışan Biyosensör- Mikrorobot Sistemlerinin Geliştirilmesi ve Kontrolü(TUBİTAK, 2020) Ablay, Gunyaz; İçöz, KutayBu arastırma mikron seviyesinde hareket etme yetenegine sahip manyetik levitasyon ile çalısan biyosensör-mikrorobot tasarımını gerçeklestirmeye çalısmaktadır. Manyetik levitasyon teknigi, mikro/nano manyetik parçacıklar ile kuvvetlendirilmis veya paramanyetik bir ortama serpilmis biyolojik varlıkların (tümör hücresi gibi) tespitinde veya analizinde kullanılabilir. Benzer mantıkla, kontrollü manyetik levitasyon ile mikro-manyetik parçacıklar içeren mikrorobotlar gelistirilerek mikron seviyesindeki tekrarlanan çesitli görevlerin otomatik bir sekilde yapılması saglanabilir. Manyetik levitasyon tahrik sistemleri biyolojik ortamlarda zararsızdır, nahos ortam sartlarında çalısabilmektedir ve sürtünmenin etkisini minimize edebilme özelligine sahiptir. Mikrorobot teknolojisi ile minyatür parçalar belli bir hedef noktaya tasınabilir ve nahos/tehlikeli ortamlarda kurulabilirler. Bu proje, etkin ve otomatik mikro-parçacık manipülasyonu için geribeslemeli kontrol yapılarından olusan ve yatay eksende bir ve iki boyutlu manipülasyon imkanı saglayan bir elektromanyetik aktüatör tabanlı manyetik mikromanipülatör tasarımı ve uygulaması üzerine yapılmıstır. Elektromıknatıs tasarımında, uygulanan kontrol akımı ve elektromıknatıs konfigürasyonu manyetik kuvvet ve tork degerlerini belirlemektedir ve bundan dolayı en uygun, kuvvetli ve hassas bir tasarım için uygun nüve yapılarıyla beraber geribeslemeli kontrol mekanizmasının gelistirilmesine ihtiyaç vardır. Manyetik aktüatörlerin, 1 ila 10 ?m çaplı süperparamanyetik parçacık üzerinde yaklasık olarak 1 ila 25 pN kuvvet üretmesi amaçlanmıstır. Bunun için 6-8 mm boyundaki koni sekilli uca sahip nikel-demir alasımlı nüve ve 2000 bakır sarımından yapılmıs bir, iki ve dört elektromıknatıstan olusan konfigürasyonlar elde edildi. Manyetik mikromanipülatör, ilk prensipler yoluyla modellendi ve bu model yardımıyla iki farklı kontrol metodu önerildi. Ilk kontrolör ofset akım tabanlı lineer kontrolör olup modeldeki lineer olmayan terimleri dogrusallastırabilme özelligine sahiptir. Ikinci kontrolör ise integral geriadımlama tabanlı nonlineer bir kontrolör olup yumusak ve etkin kontrol akımları üretebilmektedir. Tasarlanan kontrolörlerin bir boyutta ve 2-boyutta sistemin kapalı çevrimli dinamigini kararlı hale getirdigi, hızlı geçici rejim yanıtı verdigi ve sıfır kararlı durum hatası verdigi deneysel çalısmalarla gösterilmistir. Tasarlanan elektromanyetik mikromanipülatör özellikle biyolojik ayrıstırma, tıp ve biyosensör gelistirilmesi gibi alanlarda kullanılabilecek genis bir kuvvet aralıgında çalısabilme kapasitesine sahiptir.Review Aerial Swarms: Recent Applications and Challenges(Springer, 2021) Mohamed Abdelkader; Samet GülerPurpose of review: Currently, there is a large body of research on multi-agent systems addressing their different system theoretic aspects. Aerial swarms as one type of multi-agent robotic systems have recently gained huge interest due to their potential applications. However, aerial robot groups are complex multi-disciplinary systems and usually research works focus on specific system aspects for particular applications. The purpose of this review is to provide an overview of the main motivating applications that drive the majority of research works in this field, and summarize fundamental and common algorithmic components required for their development._x000D_ _x000D_ Recent findings: Most system demonstrations of current aerial swarms are based on simulations, some have shown experiments using few 10 s of robots in controlled indoor environment, and limited number of works have reported outdoor experiments with small number of autonomous aerial vehicles. This indicates scalability issues of current swarm systems in real world environments. This is mainly due to the limited confidence on the individual robot's localization, swarm-level relative localization, and the rate of exchanged information between the robots that is required for planning safe coordinated motions._x000D_ _x000D_ Summary: This paper summarizes the main motivating aerial swarm applications and the associated research works. In addition, the main research findings of the core elements of any aerial swarm system, state estimation and mission planning, are also presented. Finally, this paper presents a proposed abstraction of an aerial swarm system architecture that can help developers understand the main required modules of such systems.Article Citation - WoS: 1Citation - Scopus: 2AlN Piezoelectric Quad-Actuators for 2D Optical Micro Scanning(Taylor & Francis Ltd, 2022) Hah, DooyoungPiezoelectric actuation has been one of the frequent choices for optical micro scanning. In most of the cases, lead zirconate titanate (PZT) has been used as the piezoelectric material. However, PZT has a potential issue in biomedical applications due to the content of lead. For this, AlN can be used as an alternative. The main drawback of AlN is its low piezoelectric coefficients. In order to overcome such a drawback, this paper presents a novel actuator configuration, designed for a quasi-static operation mode. Quad-actuators and meander-shaped hinges are the essence of the proposed actuator configuration. Numerical simulation study is carried out to prove the concept of the device. The study also shows that the proposed scanner can have the optical scan angle of 9 degree at a quasi-static mode. Two different scan modes, a raster-like mode and a Lissajous mode are tested, demonstrating the two-dimensional scanning capability of the device.Conference Object Machine Learning Assisted Particle Size and Type Classification Using Wavelength-Dependent Scattering Patterns(Wroclaw University of Science and Technology (WUST), 2021) Sinan Genc; Kutay Icoz; Talha ErdemThe presence of microplastics in oceans and water supplies have increased to critical levels within the last decade [1]. In addition to the huge mass of plastics in the seas, additional contribution to water pollution comes from our chemical wastes including toothpaste, detergents, cosmetics etc. All these pollutants end up in seas or clean water sources, which eventually affects the sea life but also the human health via the water consumption and the food chain [2]. Slowing down the microparticle pollution in water first relies on identifying and tracking these particles in a cost-effective manner so that the microparticles can be easily detected before they accumulate. To address this challenge, in this study, we investigated the scattering patterns of different microplastic samples at different concentrations in aqueous samples. By analyzing these scattering patterns obtained using blue, green, and red low-power lasers, we show that it is possible to classify the microparticles particles in terms of their size, concentration, and first time for the material type in a liquid sample thanks to random forest algorithm that accomplish the limited theoretical calculations. Figure 1: (a) Scattering behavior of 8 um Me samples under green laser with increasing concentration (b) scattering behavior of three different microplastics under red laser with 1.50 fM concentration. The aim of all these experiments was to show that the scattering patterns change for different type and size of the microplastics in liquid samples. As presented in Fig. 1(a), for the same excitation wavelength and material at the same size (green laser operating at 520 nm and 8 um-sized Melamine microparticles) the distance of the observed peaks and valleys from the center does not have any concentration dependence; nevertheless, the scattering intensity increases very strongly as the particle concentration increases. Especially the average intensities of the pixels, farthest away from the center turn out to be clear indicators of the microparticle concentration in water. In Fig. 1(b), we employed a red laser operating at 650 nm to record the scattering patterns of these particles all at 1.50 fM. The comparison between the melamine and polystyrene particles having the same size reveals peaks at different distances from the center and at different intensities originating from the different refractive indices of these particles.Article Ergotropy of Quantum Battery Controlled via Target Attractor Feedback(IOSR Journal Of Applied Physics (IOSR-JAP), 2020) Sergey BorisenokModel: Quantum battery (QB) is a device that is capable to be charged efficiently and store the energy for a long period of time to be transferred to consumption centers. There are many different physical types of such devices and different charging schemes. Here we discuss the single-qubit based QB in the form of quantum oscillator in a Markovian bath environment. The charging of QB is performed via so-called 'coherent' control u(t) in the Hamiltonian and time dependent spectral density n(t) as an 'incoherent' control (number of excitations in the bath). Our goal is to drive the ergotropy of the stored qubit via the certain control algorithm. Methods: For the effective control we apply here Kolesnikov’s ‘target attractor’ (TA) feedback algorithm. In the frame of this approach we form an attractor set targeting the evolution of the basic characteristics of quantum battery. TA method makes the effective design of the control fields charging the battery; the corresponding control signals could be restored explicitly from the dynamical equations. Interestingly, the proposed algorithm applied to our single qubit model of QB has an analytical solution. Results and Discussion: As a result for the control goal, we obtain an exponentially converting behavior for driving the quantum battery ergotopic characteristics. Our algorithm can be extended to the multi-qubit model of QB (for the parallel or collective charging scheme). It could be applied also for different physical realizations of QBs: Dicke QB, spin QB, harmoniс oscillator QB; and for all working stages of the QB (charging, long time storage and the energy transfer to a consumption center or engine). Conclusion: Feedback algorithms, particularly in the form of target attractor approach, can be applied efficiently to control the set of fundamental characteristics of quantum batteries, including the ergotropy, charging power and others. The analytical study of the proposed model and its numerical simulations demonstrate the possibility to imply the developed mathematical algorithm experimentally for a single qubit system and the set of few qubits as well.Article Suppressing Epileptiform Dynamics in Small Hodgkin-Huxley Neuron Clusters via Target Repeller-Attractor Feedback(IOSR Journal of Mathematics (IOSR-JM), 2020) Sergey BorisenokModel: Quantum battery (QB) is a device that is capable to be charged efficiently and store the energy for a long period of time to be transferred to consumption centers. There are many different physical types of such devices and different charging schemes. Here we discuss the single-qubit based QB in the form of quantum oscillator in a Markovian bath environment. The charging of QB is performed via so-called 'coherent' control u(t) in the Hamiltonian and time dependent spectral density n(t) as an 'incoherent' control (number of excitations in the bath). Our goal is to drive the ergotropy of the stored qubit via the certain control algorithm. Methods: For the effective control we apply here Kolesnikov’s ‘target attractor’ (TA) feedback algorithm. In the frame of this approach we form an attractor set targeting the evolution of the basic characteristics of quantum battery. TA method makes the effective design of the control fields charging the battery; the corresponding control signals could be restored explicitly from the dynamical equations. Interestingly, the proposed algorithm applied to our single qubit model of QB has an analytical solution. Results and Discussion: As a result for the control goal, we obtain an exponentially converting behavior for driving the quantum battery ergotopic characteristics. Our algorithm can be extended to the multi-qubit model of QB (for the parallel or collective charging scheme). It could be applied also for different physical realizations of QBs: Dicke QB, spin QB, harmoniс oscillator QB; and for all working stages of the QB (charging, long time storage and the energy transfer to a consumption center or engine). Conclusion: Feedback algorithms, particularly in the form of target attractor approach, can be applied efficiently to control the set of fundamental characteristics of quantum batteries, including the ergotropy, charging power and others. The analytical study of the proposed model and its numerical simulations demonstrate the possibility to imply the developed mathematical algorithm experimentally for a single qubit system and the set of few qubits as well.Article Control over Cavity Assisted Charging for Dicke Quantum Battery(ResearchGate, 2020) Sergey BorisenokWe study feed forward (open-loop) control approach for driving the cavity assisted charging process in the Dicke quantum battery, in which the coupling between the cavity and quantum twolevel subsystem(s) plays a role of control parameter.The dynamics of the system is described with the Tavis - Cummings Hamiltonian. The analytical result is supported with the corresponding numerical simulations to demonstArticle Design and analysis of low profile and low SAR full-textile UWB wearable antenna with metamaterial for WBAN applications(ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2020) Husnu Yalduz; Timucin EmreTabaru; Veli Tayfun Kilic; Mustafa TurkmenIn this paper, a low-profile wearable antenna with metamaterial (MM) for wireless body area network (WBAN) applications is presented. The designed antenna with MM operates in the ultra-wideband (UWB) between 4.55 and 13 GHz and it has a thickness of 4.68 mm. To the best of our knowledge, it is the lowest thickness reported in the literature for UWB antennas with MM. The proposed is designed and manufactured using fully flexible textiles. The designed antenna was simulated in free space and on the human body model. Simulation results show that gain, directionality, and front-to-back ratio of the antenna increase considerably with the placement of the MM. Also, in simulations, it is found that the specific absorption rate (SAR) values for the designed antenna reduce by 98.3% when MM is used. These SAR values calculated for the designed antenna with MM are well below the limits defined in European standards. The designed antenna and metamaterials were manufactured, too, and scattering parameters were measured. Measurement results are in good agreement with the results found in the simulations. It shows that the proposed antenna is very suitable for use in WBAN applications due to its low thickness, having low SAR, and UWB operation.