Rektörlüğe Bağlı Birimler

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Combustion synthesis and photoluminescence properties of CaAl2O4 : Eu2+, Y3+ based long lasting nanophosphors
(KOREAN ASSOC CRYSTAL GROWTH, INCSUNGDONG POST OFFICE, P O BOX 27, SEOUL 133-600, SOUTH KOREA, 2014) Halefoglu, Yusuf Ziya; Serindağ, Osman; AGÜ; Serindağ, Osman
Phosphorescent materials are known as long lasting materials including lanthanide atom doped nano particles which recently have found wide application field. Phosphorescent, classically, is the materials which have light emission in visible region of electromagnetic spectrum on removal of excitation effect such as radiation, electron beam, electrical field, temperature etc. A novel red long lasting phosphor CaAl2O4 : Eu2+, Y3+ nano phosphors have been prepared using a combustion method. The crystallization, particle sizes and luminescence properties of the samples have been investigated systematically by using powder X-ray diffraction, scanning electron microscopy, luminescence spectrophotometer and FT-IR.
Course of unborn baby's heart by wireless baby tracking system
(IEEE Computer Society, 2013) Özbilen, Metin Mete; Yigit, Enes; Isiker, Hakan; Kaplanoglu, Mustafa; AGÜ; Özbilen, Metin Mete
The most important problem for pregnant and gynecologist is tracking of unborn baby. An important part of infant deaths occur in the last months of pregnancy. For this reason, by using an external fetal monitor non-stress test (NST) measurements are done for gathering information about the baby's condition. This method is a procedure that requires specialist from a medical center. The proposed study aims wirelessly transmission of NST measurement results to the specialist or health center. Thus, in case of any particular problems by giving notice to the patient, it is intended to provide her being shipped to the nearest medical facility.
Cumhurbaşkanı Abdullah Gül Demokrasi ve Hukuk Yolunda Meclis Konuşmaları
(Cumhurbaşkanlığı Yayınları, 2014) Gül, Abdullah; AGÜ; Gü, Abdullah
Cumhurbaşkanı Abdullah Gül Diplomaside Erdemli Güç Dış Politika Konuşmaları
(Cumhurbaşkanlığı Yayınları, 2014) Gül, Abdullah; AGÜ; Gül, Abdullah
Cumhurbaşkanı Abdullah Gül Gelecek Yakın Üniversite Konuşmaları
(Cumhurbaşkanlığı Yayınları, 2014) Gül, Abdullah; AGÜ; Gül, Abdullah
Cumhurbaşkanı Abdullah Gül Global Perspektif Yurtdışı Basın Mülakatları
(Cumhurbaşkanlığı Yayınları, 2014) Gül, Abdullah; AGÜ; Gül, Abdullah
Cumhurbaşkanı Abdullah Gül Türkiye’yi ve Dünyayı Yeniden Düşünmek Vizyon Konuşmaları
(Cumhurbaşkanlığı Yayınları, 2014) Gül, Abdullah; AGÜ; Gül, Abdullah
Directional Solidification of Al-Si-Ti Irregular Ternary Eutectic Alloy and Thermophysical Properties
(SPRINGER, 2022) Bayram, Umit; 0000-0001-8760-8024; AGÜ; Bayram, Ümit
Directional solidification of Al–11.75 wt pct Si–2.15 wt pct Ti irregular eutectic alloy which has an 843.83 K melting point, was done with different growth rates (V = 8.51 to 2065.18 µm s−1) at a temperature gradient (G) of 8.36 K mm−1 using Bridgman-type directional solidification apparatus (BTDSA). Scanning electron microscopy (SEM)—Energy dispersive X-ray (EDX) and X-ray diffraction (XRD) were used to characterize all phases forming the alloy. The average values of interflake spacing (λT) were measured from transverse sections of the directionally solidified samples with standard techniques. The dependency of λT was experimentally obtained using linear regression analysis for low, high, and all growth rates. It was observed that the λT values tended to decrease with increasing V values; therefore, the interflake structures came closer. The fusion enthalpy (ΔHf) and specific heat difference between solid and liquid (ΔCp) for the Al–Si–Ti eutectic alloy were found as 376.12 J g−1and 0.659 J g−1 K−1, respectively, by the differential scanning calorimetry (DSC). All results obtained in the present work were compared with the eutectic theory and the Al-based similar experimental results in the literature.
The effect of seed sludge type on aerobic granulation via anoxic-aerobic operation
(TAYLOR & FRANCIS LTD2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND, 2014) Erşan, Yusuf Çağatay; Erguder, Tuba Hande; 0000-0003-4128-0195; 0000-0003-4128-0195; AGÜ; Erguder, Tuba Hande
The effects of two seed sludge types, namely conventional activated sludge (CAS) and membrane bioreactor sludge (MBS), on aerobic granulation were investigated. The treatment performances of the reactors were monitored during and after the granulation. Operational period of 37 days was described in three phases; Phase 1 corresponds to Days 1-10, Phase 2 (overloading conditions) to Days 11-27 and Phase 3 (recovery) to Days 28-37. Aerobic granules of 0.56 +/- 0.23 to 2.48 +/- 1.28mm were successfully developed from both MBS and CAS. First granules appeared on Day 9 in both reactors, indicating that there was no difference between two seed sludge types in terms of the time period for granulation initiation. The results revealed that the granules developed from MBS performed better than CAS in terms of settleability, stability, biomass retention, adaptation, protection of granular structure at high loading rates (0.86 gN/L d and 3.92 gCOD/Ld) and low COD/TAN ratio (5). Granules of MBS were also found to be capable of providing better protection for nitrifiers at toxic free-ammonia concentrations (38-46 mg/L NH3-N), thus showing better treatment recovery than those of CAS.
Examining Tongue Movement Intentions in EEG-Based BCI with Machine and Deep Learning: An Approach for Dysphagia Rehabilitation
(Sciendo, 2024) Aslan, Sevgi Gökçe; Yılmaz, Bülent; 0000-0001-9425-1916; AGÜ; Aslan, Sevgi Gökçe
Dysphagia, a common swallowing disorder particularly prevalent among older adults and often associated with neurological conditions, significantly affects individuals' quality of life by negatively impacting their eating habits, physical health, and social interactions. This study investigates the potential of brain-computer interface (BCI) technologies in dysphagia rehabilitation, focusing specifically on motor imagery paradigms based on EEG signals and integration with machine learning and deep learning methods for tongue movement. Traditional machine learning classifiers, such as K-Nearest Neighbors (KNN), Support Vector Machine (SVM), Decision Tree, Naive Bayes, Random Forest, AdaBoost, Bagging, and Kernel were employed in discrimination of rest and imagination phases of EEG signals obtained from 30 healthy subjects. Scalogram images obtained using continuous wavelet transform of EEG signals corresponding to the rest and imagination phases of the experiment were used as the input images to the CNN architecture. As a result, KNN (79.4%) and SVM (63.4%) exhibited lower accuracy rates compared to ensemble methods like AdaBoost, Bagging, and Random Forest, all achieving high accuracy rates of 99.8%. These ensemble techniques proved to be highly effective in handling complex EEG datasets, particularly in distinguishing between rest and imagination phases. Furthermore, the deep learning approach, utilizing CNN and Continuous Wavelet Transform (CWT), achieved an accuracy of 83%, highlighting its potential in analyzing motor imagery data. Overall, this study demonstrates the promising role of BCI technologies and advanced machine learning techniques, especially ensemble and deep learning methods, in improving outcomes for dysphagia rehabilitation.
Exploring transdisciplinary interaction in higher education: urbanism through informal learning environment
(EMERALD GROUP PUBLISHING LTD, 2025) Kesim, Berk; Bengu, Elif; 0000-0001-8772-4084; 0000-0001-9817-7207; AGÜ; Bengu, Elif
PurposeThis study aims to explore interdisciplinary and transdisciplinary interactions around sustainability, focusing on the United Nations sustainable development goals (SDGs). By using the city as an informal learning space, it presents a case study to raise SDG awareness, promote interdisciplinarity, foster critical thinking and empower students.Design/methodology/approachUsing qualitative content analysis, this study explores students' interdisciplinary engagements. The research centers on student-created Logbooks, combining field data for analysis via open coding.FindingsThe informal setting facilitates transdisciplinary interaction and enriches interdisciplinary skills while retaining individuals' disciplinary tendencies.Research limitations/implicationsFactors like local geographical conditions and participant numbers could lead to minor variations in future course applications. Although initial problem topics and discussions are confined to local urban geography, they might diversify during implementation.Practical implicationsThe Logbook serves as a guide for local urban issues and embodies interdisciplinary outcomes. It can be enhanced with maps and problem zoning.Social implicationsDemonstrates effective SDG integration into higher education.Originality/valueThis study spotlights interdisciplinary learning within an unconventional context - urbanism - bridging student gaps. Supported by a paradigm shift from sustainability to unsustainability, it underscores the significance of critical engagement with SDGs.
Investigation of corrosion inhibition effect of 3-[(2-hydroxy-benzylidene)-amino]-2-thioxo-thiazolidin-4-one on corrosion of mild steel in the acidic medium
(ELSEVIER, 2013) Döner, Ali; Şahin, Ece Altunbaş; Kardaş, Gülfeza; Serindaĝ, Osman; AGÜ; Serindaĝ, Osman
The corrosion behavior of mild steel (MS) in 0.5M H2SO4 was studied using 3-[(2-hydroxy-benzylidene)-amino]-2-thioxo-thiazolidin-4-one (HBTT) as inhibitor using the conventional potentiodynamic polarization studies, linear polarization studies (LPR), electrochemical impedance spectroscopy studies (EIS). SEM was utilized for surface characterization. The results showed that HBTT posses excellent inhibition effect towards MS corrosion. The inhibitor molecules were first adsorbed on the MS surface and blocking the reaction sites available for acid attack. Adsorption of inhibitor was found to obey Langmuir isotherm and was more chemical than physical.
A mathematical model with piecewise constant arguments of colorectal cancer with chemo-immunotherapy
(PERGAMON-ELSEVIER SCIENCE LTD, 2023) Bozkurt, Fatma; Yousef, Ali; Bilgil, Halis; Baleanu, Dumitru; AGÜ; Yousef, Ali
We propose a new mathematical model with piecewise constant arguments of a system of ODEs to investigate the growth of colorectal cancer and its response to chemo-immunotherapy. Our main target in this paper is to analyze and represent the I.S.'s (immune system) efficiency during the chemotherapeutic process. Therefore, we proved and illustrated the necessity of IL-2 that supports the immune system, especially in early-detected cases of tumor density. Thus, the constructed model has been divided into sub-systems: the cell populations, the effects of the medications doxorubicin, and IL-2 concentration.Firstly, we analyze the stability of the equilibrium points (disease-free and co-existing) using the RouthHurwitz criteria. In addition, our study has shown that the system undergoes period-doubling, stationary and Neimark-Sacker bifurcations based on specific conditions. In the end, we illustrate some simulations to assist the theory of the manuscript.
Staging of the liver fibrosis from CT images using texture features
(2012) Kayaalti, Ömer; Aksebzeci, Bekir Hakan; Karahan, Ibrahim Ö.; Deniz, Kemal; Öztürk, Menmet; Yilmaz, Bülent; Kara, Sadik; Asyali, Musa Hakan; 0000-0003-2954-1217; 0000-0001-7476-8141; AGÜ; Aksebzeci, Bekir Hakan; Yilmaz, Bülent; Asyali, Musa Hakan
Even though liver biopsy is critical for evaluating chronic hepatitis and fibrosis, it is an invasive, costly, and difficult to standardize approach. The developments in medical image processing and artificial intelligence methods have advanced the potential of using computer-aided diagnosis techniques in the classification of liver tissues. The aim of this study was to develop a non-invasive, cost-effective, and fast approach to specify fibrosis stage using the texture properties of computed tomography images of liver. Gray level co-occurrence matrix, discrete wavelet transform, and discrete Fourier transform were the image analysis tools in the feature extraction phase. Following dimension reduction of the texture features support vector machines and k-nearest neighbor methods were used in the classification phase of this study. Our results showed that our approach is feasible in fibrosis staging especially in pairwise stage comparisons with success rate of approximately 90%.
Vision-Based Autonomous Aerial Refueling
(American Institute of Aeronautics and Astronautics Inc, AIAA, 2022) Erkin, Tevfik; Abdo, Omer; Sanli, Yilmaz; Celik, Harun; Isci, Hasan; AGÜ; Sanli, Yilmaz
Aerial refueling tasks are very challenging due to the high risk of aircraft close proximity. Currently, within the drogue-probe method, the receiver aircraft pilot manages the refueling task in accordance with the tanker aircraft pilot. Therefore, autonomous aerial refueling is still an unaccomplished task for aircrafts. In this paper, a fully automated aerial refueling procedure based on digital visual inspection is proposed. A nonlinear dynamic model of receiver aircraft is derived to track the motion of drogue. In order to control the receiver aircraft affected by tanker aircraft vortex during approach, and ensure the receiver aircraft to automatically track and dock the tanker aircraft, an autopilot system that considers visual sensing of drogue motion is designed. The receiver aircraft is controlled by the autopilot system via translational motion of tanker aircraft projected by a camera mounted on the receiver aircraft. Thanks to this vision-based controllers, the need of tanker aircraft positioning is denied since camera projection has the capability of perception of three-dimensional direction of tanker aircraft. In order to test the autopilots include vision-based controllers and algorithms, the vision-based autonomous aerial refueling is operated under presence of turbulence and vortex. Finally, the simulation results demonstrate that the proposed guidance-navigation-control system achieve aerial refueling autonomously, and make it feasible and realizable for aircrafts.
Within our walls: White-collar crime in Greek academia
(Taylor and Francis, 2015) Georgoulas, Stratos; Voulvouli, Aimilia; AGÜ; Voulvouli, Aimilia
The study of white-collar crime remains a central concern for criminologists around the world and research concentrates on its nature, prevalence, causes and responses. However, most books on white-collar crime tend to focus on Anglo-American examples, which is surprising given the amount of rich data and research taking place in mainland Europe. This new handbook seeks to reset the balance and, for the first time, presents an overview of state-of-the-art research on white-collar crime in Europe. Adding to the existing Anglo-American body of knowledge, the Handbook will discuss specific European topics and typical European features of white-collar crime. The Routledge Handbook of White-Collar and Corporate Crime in Europe consists of more than thirty chapters on topics ranging from the Icelandic Banking Crisis, to the origins of the study of white collar crime, to contemporary topics, such as white-collar crime in countries post-transition from communist regimes; the illegal e-waste trade and white-collar crime in professional football. Furthermore, the book contains extensive case study analyses of landmark European cases of white-collar crime. The editors have gathered together the leading voices in the field and a final section offers commentaries on white-collar crime in Europe from eminent criminologists David Friedrichs and Hazel Croall. This Handbook will thus serve as a work of reference for all scholars and students engaged in the study of corporate and white-collar crime and will also set out directions for new research in the future.
YENİ YÜZYILDA TÜRK DIŞ POLİTİKASININ UFUKLARI
(T.C. DIŞİŞLERİ BAKANLIĞI YAYINLARI, 2007) Gül, Abdullah; AGÜ; Gül, Abdullah
Türkiye, uluslararası sistem içinde herhangi bir ülke değildir. Tek bir coğrafi bölgeyle tanımlanamayan, kıtaların ve havzaların kesişme noktasını oluşturan jeostratejik konumumuz, Osmanlı mirasımız, Doğu'yla Batı'yı meczeden sosyo-kültürel yapımız ve transatlantik ittifak içindeki özel konumumuz nedeniyle, ulusal çıkarlarımız çok farklı coğrafyalara ve alanlara yayılmış durumdadır. Türkiye'nin bölgesine ve uluslararası sisteme dar kalıplar tanımlanmış güvenlik çıkarları açısından bakan değil, çıkarlarını daha geniş bir çerçevede, uluslararası ve bölgesel işbirliği çerçevesinde tanımlayan bir ülke olarak 21. yüzyıla damgasını vurmasını hedefliyoruz. Statükocu, tepkisel, ve agresif değil, uzlaşma kültürüne açık ve çevresinde olumlu değişiklikleri teşvik eden bir politikayla çıkarlarımızı daha iyi savunabileceğimizi düşünüyoruz. Artık ''çevremiz hasımlarla çevrili'' varsayımına dayanan çatışma psikolojisinden çıkarak, ''çevremizle işbirliği ve diyalog ortamının kurucu aktörü'' rolünü benimsemek zorundayız. Büyük ülke ideali, ancak böyle bir özgüvenle gerçekleştirilebilir.

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