WoS İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8653

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Citation - WoS: 2
Academic Mobbing in Turkey and Suggestions for Solutions: Content Analysis of Graduate Theses
(Tuba-turkish Acad Sciences, 2019) Erdemir, Burcu; 192351
The effects of globalization on various sectors around the world are reflected in academia through competition, diminishing job security and faculty collegiality, and changing managerial understanding which causes academics to feel pressured to maintain the balance between teaching and research. This transformation inevitably has made the concepts explained by Foucault as "the power exerciser" and "the subject of power" more apparent, as demonstrated by conflicts and mobbing cases. The aim of this study is to review all the master's theses and doctoral dissertations written in Turkey to pin down what has been done until now on mobbing and to form a reference point. Upon searching for certain key words on the website of Council of Higher Education Thesis Center in June 2017, 655 theses on mobbing in various sectors with diverse participant groups were detected. After examining these theses in terms of their participants, it was found out that 29 of them, written between 2005 and 2017, addressed the issue of mobbing among academics. Of these, 26 theses, written between 2006 and 2016, were included in the study. The findings of these theses indicate that while there is 4-100% mobbing in the state and the foundation universities, younger people, singles, and women are more vulnerable to mobbing regarding self-expression, social relations, and communication, and they prefer to remain silent in the face of this issue. Besides, there is a negative relationship between mobbing and seniority, title, organisational justice, trust, commitment, and job-satisfaction. The primary causes of mobbing in academia are nepotism, poor leadership, unhealthy organisational culture, solidarity, andlack of communication. This study is expected to contribute to the formation of a conceptual framework about academic mobbing for the future studies and to expediting the process of taking measures for the eradication of the problem.
Citation - WoS: 1
Addressing Earthquake Risk and Climate Crisis Together in Spatial Planning
(Kare Publ, 2021) Orhan, Ezgi; Peker, Ender; 34038
Cities' vulnerability to natural and man-made threats are ever increasing. Cities are under the threat of both natural disasters such as earthquakes, avalanches and landslides; and climate-driven challenges such as excessive precipitation, heatwaves and droughts. This calls for a need of handling natural and human systems together for the future of cities. However, climate and earthquake action plans which naturally present a direct link to spatial planning, are often produced separately in the Turkish planning practice. This study advocates that strategies for combating earthquake and climatic challenges should be harmonized together within the spatial planning system, and respectively, aims at presenting a holistic planning approach. For this purpose, the study first examines the ways in which disaster and climate issues are addressed in the current laws and national action plans. Then, in line with the 'Regulation on the Preparation of Spatial Plans', it examines the spatial planning scales with an aim of determining the potential areas in which disaster and climate issues could be planned together. Taking this as a point of departure, the paper presents a set of planning strategies responding to earthquake risk and climate crisis at regional, city, neighbourhood and building scales. It discusses synergies and conflicts among these strategies at different scales. This study targets to develop a holistic perspective for earthquake and climate change induced disasters, for the decision-makers and practitioners operating in spatial planning processes.
Citation - Scopus: 1
Alevism in Recent Researches Written in English
(Gazi Univ, Turk Kulturu ve Haci Bektas veli, 2010) Kurt, Zeynep; Yilmaz Kurt, Zeynep; 103796; İngilizce Mütercimlik ve Tercümanlık
As a religious ethnic group that covers a considerable number of Turkish population, the history of Alevis goes back to the Ottoman-Safavid conflict in the 16(th) and 18(th) centuries. The history of Alevis, however, has not been well recorded, and relevantly researched. Starting from the 1980s, and due to the developing communication technologies and globalization, it has been possible to talk about an "Alevi revival" since the 1980s. This study aims to review the large bulk of research that is done on Alevism since the 1980s. The achieved results display a deep concern with Alevis in contemporary life, their history, traditions and beliefs as well as identity and integration problems of the Diasporas.
Americanization of Political Campaigns: a Comparison of the Cases of Forza Italia and the Young Party
(Turkiye Orta Dogu Amme Idaresi Enstitusu, 2010) Turk, Hasan Bahadir; Türk, Hasan Bahadır; 18664; Siyaset Bilimi ve Uluslararası İlişkiler
Similar to political institutions and structures, political campaigns have also undergone dramatic transformations. The Americanization of political campaigns, which are characterized by certain peculiarities, such as the personalization of politics, weakening of party organizations, wide use of media channels in the political marketing process, need for specialization, primacy of opinions over ideologies and conceptualization of citizens as policy consumers, is a by-product of these dramatic transformations. This paper aims to compare Forza Italia and the Young Party through the Americanization of political campaigns with special emphasis on the connection between the transformation of political campaigns and the crisis of representative democracy.
An Analysis on the Effect of Skip Connections in Fully Convolutional Networks for License Plate Localization
(Institute of Electrical and Electronics Engineers Inc., 2019) Uzun, E.; Akagunduz, E.; 233834
In this study, the effect of the skip connections, which are seen in fully convolutional networks, on object localization is analyzed. For this purpose, a local data set for plate detection is created. Experiments are carried out using this data set. Due to the small size of the image set, data augmentation method is used to overcome the danger of over-fitting. The learning rates of the first layers are frozen for analysis and finetuning is applied to only the last layer and deconvolution layers. The results obtained are compared with the results of other image sets. The results indicate the importance of the information provided by the skip connections on object localization. © 2019 IEEE.
Citation - WoS: 3
Citation - Scopus: 4
An Analytical Investigation of Rigid Plastic Beams Under Impact Loading
(Gazi Univ, Fac Engineering Architecture, 2015) Gultop, Tekin; Gültop, Tekin; Yilmaz, Mahmut Cem; Alyavuz, Bahadir; 5168; İnşaat Mühendisliği
Beams might be subjected to impact loading which is a particular type of dynamic loading during their service lives. In this study the behaviour of beams under low speed impact loading has been investigated analytically. Simply supported and fixed ended beams have been analyzed with the assumption of rigid plastic behaviour. The collapse mechanism has been assumed to emerge by the instant formation of plastic hinges, hence, a limit analysis has been performed under dynamic loading considering the conservation principles of energy and momentum. The behaviour of rigid plastic beams under impact loading has been compared to the behaviour of elastic beams under similar loading conditions.
Citation - WoS: 5
Citation - Scopus: 5
Ann and Anfis Performance Prediction Models for Francis Type Turbines
(Turkish Soc thermal Sciences Technology, 2020) Aylı, Ülkü Ece; Ayli, Ece; Ulucak, Oguzhan; 265836; Makine Mühendisliği
Turbines can be operated under partial loading conditions due to the seasonal precipitation fluctuations and due to the needed electrical demand over time. According to this partial working need, designers generate hill chart diagrams to observe the system behavior under different flow rates and head values. In order to generate a hill chart, several numerical or experimental studies have been performed at different guide vane openings and head values which are very time consuming and expensive. In this study, the efficiency prediction of Francis turbines has been performed with ANN and ANFIS methods under different operating conditions and compared with simulation results. The obtained results indicate that it is possible to obtain a hill chart using ANFIS method instead of a costly experimental or numerical tests. ANN and ANFIS parameters which effect the output, have been optimized with trying 100 different cases. 75% of the numerical data set is used for training and 25 % is used for validation as testing data. To asses and compare the performance of multiple ANN and ANFIS models several statistical indicators have been used. Insight to the performance evaluation, it is seen that ANFIS can predict the efficiency distribution with higher accuracy than the ANN model. The developed ANFIS model predicts the efficiency with 1.41% mean average percentage error and 0.999 R-2 value. To the best of the author's knowledge, this is the first study in the literature that ANN and ANFIS are used in order to predict the efficiency distribution of the turbines at different loading conditions.
Citation - Scopus: 2
Approaches on the Selection of Web Cameras and Calibration Targets for Stereo Vision
(Ieee, 2006) Eren, Haluk; Celik, Umit; Poyraz, Mustafa
In this paper, it is studied on the calibration by using specified web cameras. The performance of 3D computer vision depends on the accuracy of camera parameters. Therefore, camera calibration is very crucial in stereo vision. In this study, the options and selection of the target object that is used by the process of camera calibration are reviewed and evaluated some results obtained by web cameras. Webcams' costs are low relatively to the other digital consumer cameras but cannot be acquired a high resolution image.
Architectural Design - Structural System Conformity Problems Encountered in the Design and Application Processes of Stick Aluminium Curtain Wall Systems in Turkey
(Gazi Univ, Fac Engineering Architecture, 2022) Ozmen, Cengiz; Saban, Muge; 56939
Stick aluminium curtain wall (SACW) systems are common curtain wall systems in Turkey. These sytems offer many advantages including architectural variation, modular design, ease of production and assembly. Beside their architectural properties SACW systems create significant load effects on structural systems. These load effects include lateral loads such as seismic and wind loads as well as static vertical loads. This load transfer is not one way. The vertical and lateral displacements of building structures also act on curtain walls. Healthy load transfer between the SACW and the building depends on architectural decisions during the design and construction process. Due to their wide use SACW systems are prone to architectural mistakes. These mistakes often represent themselves at latter stages of the construction and require solutions which will affect the architectural characteristics and structural behavior of buildings. This study focuses on SACW design and construction processes to find the effects of architectural decisions on curtain wall behavior. Case studies that include architectural design mistakes are selected to classify and study the reasons and the solutions of these mistakes. The importance of cooperation between all the stakeholders including the architects and engineers is emphasized for the prevention of these mistakes.
Citation - WoS: 11
Citation - Scopus: 16
Artificial Intelligence Applications in Earthquake Resistant Architectural Design: Determination of Irregular Structural Systems With Deep Learning and Imageai Method
(Gazi Univ, Fac Engineering Architecture, 2020) Bingol, Kaan; Akan, Asli Er; Ormecioglu, Hilal Tugba; Er, Arzu; 154406
Although the architectural design process is carried out with the collaboration of experts who are experienced in many different areas from the main preferences to the detailing stage, the major decisions such as plan organization, mass design etc. are taken by the architect. Computer Aided Design (CAD) programs are generally effective after the major decisions of the design are taken. For this reason, it is common for the main decisions, taken during the design process, to be changed during the analysis of the structural system. In order to prevent this, in the early stages of architectural design, earthquake system awareness and structural system design should be included as an design input; as, the failure of the structural system which did not considered well in the architectural design phase leads to unexpected revisions in the implementation project phase and thus leads to serious losses in both time and cost. The aim of this study is to create an Irregularity Control Assistant (IC Assitant) that can provide architects general information about the appropriateness of structural system decisions to earthquake regulations in the early stages of design process by using the deep learning and image processing methods. In this way, correct decisions will be made in the early stages of the design and unexpected revisions that may occur during the implementation project phase will be prevented.
An Assessment of Reconciliation Processes and Completion of the International Tribunal
(International Relations Council of Turkey, 2016) Çoban Öztürk, E.; 105587
After the 1994 Rwandan genocide, solution and social reconciliation processes has started in this country. These processes are being conducted in terms of politics, economics, social psychology and law both in international and national levels. The most important and substantial contribution to the reconciliation process has taken place mainly from the International Criminal Tribunal for Rwanda. The Tribunal was established as an ad hoc Tribunal but its contributions to the social reconciliation and international law is permanent. The Tribunal has completed its twenty first year for now and as an ad hoc tribunal, its mission is going to be terminated at the end of 2015 after completing its proceedings. The Tribunal’s mission was completed at December 31, 2015. The jurisdiction of the Tribunal and the ongoing cases will be assigned to national courts and to the newly established International Residual Mechanism for Criminal Tribunals. This study presents the structure and completion strategy of the Tribunal and the contribution of it to the reconciliation processes of Rwanda. Then criticisms about the legal systems and social reconciliation are going to be discussed. © 2016, International Relations Council of Turkey. All rights reserved.
Authorship Modelling Approach for Authorship Verification on the Turkish Texts
(Ieee, 2018) Akcapinar Sezer, Ebru; Sever, Hayri; Canbay, Pelin; 11916
Authorship attribution which aims to extract information about an author by analyzing the text of the author is a challenging field that has been studied for years. This study becomes even more difficult when there is limited data on this field. The need for this study carried out under the name of Authorship Verification is increasing day by day with the increase of anonymous authors in the electronic environments. In this study, a model-based solution approach is presented for the authorship verification problem. With the presented approach, it was determined what should be the success interval to be considered in the authorship verification problem.
Citation - WoS: 2
Citation - Scopus: 6
Barış Eğitimi: Evrimleşmiş bir Şiddetsizlik Bilinci için Eğitim
(Center Foreign Policy & Peace Research, 2016) Yemenici, Alev; 100753
Bu makale beyin temelli ön bir barış eğitimi modeli sunmayı amaçlamaktadır. Günümüzdeki barış eğitimi modellerinin vurguladığı insan hakları eğitimi, çevre eğitimi ve çatışma çözümü eğitimi konularının yanısıra, bu model şiddetin nörobiyolojik nedenleri ve erken önlenmesi meselelerinin ele alınabileceği yeni bir seviye -hücresel seviye- öne sürmektedir. Özellikle, bu model, şiddetin nörobiyolojik sebepleri ve önlenmesi ile erken travmanın doğum öncesi, doğum sırasında ve sonrasında gelişmekte olan beyin üzerindeki etkisi hakkındaki bilgileri yayılmasını savunmaktadır. Sevgi ve şiddete ilişkin kimyasallara dair temel ve beynin esas yapısı bu erken dönemlerde oluşmaktadır. Diğer bir deyişle bu model, çocuklar, ergenler ve yetişkinlerin eğitimi yoluyla şiddetin önlenebileceği hücresel bir boyut olduğunu ortaya koymaktadır.
Citation - WoS: 2
Citation - Scopus: 2
Ber Anaylsis for Super Lorentz-Gaussian Laser Beams Propagating in Turbulent Media
(Gazi Univ, Fac Engineering Architecture, 2013) Gokce, Muhsin C.; Gökçe, Muhsin Caner; Sari, Filiz; Ozek, Faruk; 28643; Elektronik ve Haberleşme Mühendisliği
In this work, BER-SNR variation of super Lorentz-Gaussian laser beam that propagating horizontally path in turbulent media is analyzed. Using scintillation index which is obtained by extented Huygens-Fresnel principle, BER - SNR value is calculated. Matlab program is used to show BER - SNR variation depending on link distance and beamwidth. To conclude, in short link range, super Lorentz-Gaussian beam is proven to be better link performance superior to commercially available Gaussian beam.
Citation - WoS: 6
Citation - Scopus: 7
Blocked-Dwt Based Vector Image Watermarking
(Ieee, 2015) Dincer, Kivanc; Sever, Hayri; Elbasi, Ersin; Senol, Ahmet
Image watermarking is in use for proving ownership for a fairly long time. For most of the study on this area, a pseudo random number sequence PRSN or a binary image logo is embedded as watermark. Nowadays the owner's face or sound is also embedded as biometric watermark. Image is transferred to discrete wavelet transform domain, watermark is embedded to DWT values, then DWT values are retransformed to spatial domain to obtain watermarked image. Embedding a vector image logo as watermark was not tried in previous works. In this work, non-blind robust watermarking is applied using a vector image as watermark. Various attacks are applied to watermarked images and for each of these attacks vector image watermark is obtained equal or almost equal to the original. Embedding vector image as watermark will bring a new discipline for image watermarking and a new development will arise in this perspective.
The Bright and Dark Sides of Work Life" Tpd Work and Organizational Psychology Special Issue
(Turkish Psychologists Assoc, 2019) Sumer, H. Canan; Goncu-Kose, Asli; Toker, Yonca; Ok, A. Basak; Gokalp, Aysu; Mete, Ipek; Demircioglu, Zeynep Isil; 166202
Citation - WoS: 50
Citation - Scopus: 69
Cep Telefonu Yardımıyla Dil Öğrenme: İngilizce Telaffuz Öğrenimi Parmaklarınızın Ucunda
(Ani Yayincilik, 2009) Cagiltay, Kursat; Saran, Murat; Seferoğlu, Gölge
Problem Durumu: Yabancı dil edinimi alan yazınında telaffuz ile ilgili yapılan araştırmalar göreceli olarak az sayıdadır ve dil ediniminin diğer boyutlarıyla karşılaştırıldığında bu konu ihmal edilmektedir. Benzer şekilde, sınıf ortamlarında da diğer dil bileşenleri ve becerileri ile karşılaştırıldığında başarılı bir iletişim için daha arka planda olduğuna inanıldığı için telaffuz öğretimine daha az ilgi gösterilmektedir. Bununla birlikte son zamanlarda telaffuz araştırmalarına olan ilginin artmakta olduğu da gözlenmektedir. Yabancı dil öğretimi ile ilgili alan yazında sınıf içi aktivitelerin etkili dil öğrenimi için, özellikle de kelime kazanımı için yeterli olmadığı, sınıf dışında da alıştırma ve uygulama çalışmaları yapılması gerektiği vurgulanmaktadır. Bu telaffuz öğrenimi için de geçerlidir. Sınıf içinde yapılan öğretim tek başına öğrencilerin konuşma yeteneğini çok az geliştirebilmektedir. Cep telefonlarının sahip olduğu ulaşılabilirlik, kişiselleştirilebilirlik ve taşınabilirlik gibi kendine özgü nitelikler, sınıf dışında yapılması gereken alıştırma ve uygulama çalışmalarının gerçekleştirilmesinde büyük bir potansiyele sahiptir ve birçok yarar sağlayabilir. Örneğin, öğrencilerin/kullanıcıların ders çalışmaya başlamalarını zorlaştıran motivasyon ile ilgili problemlerin ortadan kaldırılmasında cep telefonlarının çoklu ortam veya kısa mesaj özelliği kullanılabilir. Bu çalışmada, öğrencilere çoklu ortam mesajları ile alıştırma ve uygulama materyalleri gönderilerek çalışmaya teşvik edilmektedirler. Bu sayede öğrenciler ders notu ya da ders kitabını açmadan, herhangi bir web sitesine bağlanmadan ya da bilgisayar karşısına geçmeden, özel bir öğretim yazılımı kullanmadan yer ve zamandan bağımsız olarak konu tekrarı, alıştırma ve uygulama yapabilmektedirler. Böylece, birçok öğrenci için aşması zor olan ders çalışmaya başlama motivasyonu dış kaynaktan gelen bir itici uyaran aracılığıyla aşılmaktadır. Yukarıda bahsedilen potansiyelleri kullanarak dil öğreniminde cep telefonlarının kullanımını araştıran çok az sayıda çalışma vardır. Aynı zamanda öğrencilerin telaffuzlarının geliştirilmesinde cep telefonlarının kullanılması üzerine yapılan araştırmalar yok denecek kadar azdır. Bu çalışma bu eksikliği gidererek alan yazına anlamlı katkılar sağlamayı hedeflemektedir. Araştırmanın Amacı: Bu çalışmanın temel amacı cep telefonu teknolojisini kullanarak eğitim ve öğretim süreçlerinin etkin ve verimli hale getirilmesine katkıda bulunmaktadır. Bu çalışma ile İngilizce eğitiminde, cep telefonlarının kullanımı ile ilgili potansiyelleri ortaya çıkarmak ve özellikle cep telefonlarının telaffuz öğrenimine olan etkilerinin araştırması hedeflenmektedir. Araştırmanın Yöntemi: Bu araştırmada nitel veriler, nicel verilerle elde edilen bulguları desteklemede kullanılmıştır. Toplanan nitel ve nicel veriler hibrit yöntemler kullanılarak analiz edilmiştir. Nicel veriler ANOVA analizine tabi tutulmuş; nitel verilen analizinde ise örüntü analizi işe koşulmuştur. Araştırmanın nicel kısmında ön-test/son-test yarı-deneysel tasarım deseni kullanılmıştır. Nitel kısmında ise araştırma sonunda öğrencilerle yarı-yapılandırılmış görüşmeler yapılmış ve açık uçlu soruların yer aldığı değerlendirme anketi uygulanmıştır. Çalışmanın katılımcıları Ankara’da bulunan bir üniversitemizin İngilizce hazırlık okulundaki öğrencilerdir. Cep telefonlarının etkinliğini araştırmak için aynı içeriğin cep telefonu yoluyla, web sayfası üzerinden ve çalışma notları dağıtılması ile işlenmesinin kelimelerin doğru telaffuzlarının öğrenilmesinde etkililiği karşılaştırılmıştır. Araştırmanın Bulguları: Nicel verilerin analiz sonuçları cep telefonu kullanımının telaffuz öğreniminde olumlu etkileri olduğunu göstermiştir. Bu çalışmada kullanılan üç farklı yöntem ile telaffuz öğrenimleri desteklenen cep telefonu, web sayfası ve çalışma notları gruplarının sontest ile ön-test arasındaki farklarının ortalamaları diğer bir ifadeyle telaffuz kazanımları sırasıyla şu şekildedir: 11.94, 6.81 ve 6.81. Bu sonuçlara göre cep telefonu grubundaki öğrencilerin telaffuz testi ile ölçülen telaffuz kazanımları diğer gruplara göre daha yüksektir. Varyans analizi (one-way ANOVA) testi analiz sonuçları da cep telefonu ve kontrol gruplarının telaffuz kazanımları arasındaki farkın istasistiksel olarak anlamlı olduğunu göstermektedir (F (2, 21) = 5.000, p = .017). Bu anlamlı farkın hangi gruplar arasında olduğunu anlamak için Tukey HSD testi kullanılarak Post hoc karşılaştırmalar yapılmış ve bu test sonucunda cep telefonu grubu öğrencilerinin telaffuz kazanımlarının diğer iki gruptaki öğrencilerin kazanımlarından anlamlı olarak farklı olduğu (p=.032) ortaya çıkmıştır. Diğer taraftan web sayfası ve çalışma notu gruplarındaki öğrencilerin birebir aynı sayıda kelimenin telaffuzlarını öğrendikleri ortaya çıkmıştır (p=1.000). Özet olarak, bu sonuçlar cep telefonu üzerinden öğrencilere gönderilen ek materyallerin telaffuz kazanımı için daha etkili olduğunu göstermektedir. Görüşmelerde ve açık uçlu anket sorularına verilen cevaplar bu sonucu desteklemektedir. Bütün katılımcılar kullanılan cep telefonu uygulaması hakkında olumlu geri bildirimler vermişlerdir. Örneğin bir öğrenci bu uygulamanın faydaları ile ilgili görüşlerinin istendiği soruya şu şekilde cevap vermiştir: “Sesli boyut kelimelerin telaffuzunu düzgün öğrenmemizi sağlıyor. Görsel efektlerle desteklendiği için daha kalıcı olabiliyor” Benzer bir cevap olarak başka bir öğrenci de“Telaffuzları kolay bir şekilde öğrenebildim. MMS şeklinde yollanması sayesinde görsel ve işitsel olarak gördüğümüz kelimelerin telaffuzları daha hafızada kalıcı oldu.” ifadelerini kullanmıştır. Araştırmanın Sonuçları ve Önerileri: Cep telefonları genç nüfus için teknolojik aygıtlar arasında en popüler olanıdır ve çoğu kişinin yaşamında önemli bir yer tutmaktadır. Bu çalışmada temel hedeflerden bir tanesi genç nüfus tarafından cep telefonlarına gösterilen büyük ilgiden faydalanarak, ülkemizde bu teknolojinin eğitimde kullanımının önünü açmaktır. Bu
Citation - WoS: 8
Cittaslow Movement From a Critical Point of View
(Kare Publ, 2018) Can, Mehmet Cengiz; Ozmen, Ayca; 143106
The Cittaslow Movement, shaped upon the idea of slowness, emerged as a reaction to the negative effects of globalization on small cities. It was founded in 1999 in Italy through initiatives implemented by the mayors of 4 small towns (Greve in Chianti, Orvieto, Positano, Bra) and the founder of Slow Food. This movement, which aims to increase the quality of life by preserving and sustaining the local values of settlements, was quickly embraced by more than 200 small cities and towns in 30 countries. However, Cittaslow is still relatively new and developing movement, and the long-term results are not yet fully known. Cittaslow provides practical guidelines for a more livable settlement, rather than relying on theoretical concerns. It emerged as a result of social reflection rather than scientific research. Therefore, concomitant problems may arise in the implementation process. Nevertheless, in the near future, the concept is expected to continue to grow socially and scientifically through the efforts of Cittaslow International to improve the movement and as a result of the increasing interest of researchers and local authorities. It is therefore important to understand and interpret the essence of the Cittaslow Movement properly at this time. The aim of this article was to provide a framework for the founding ideas and goals of the Cittaslow Movement and to describe its development and progress. The outcomes thus far were evaluated from a critical point of view in order to make new proposals. The goal of this research was to raise awareness of the Cittaslow Movement among all stakeholders, particularly local authorities and residents.
Citation - WoS: 2
Citation - Scopus: 3
Classification of Fmri Data by Using Clustering
(Ieee, 2015) Mogultay, Hazal; Alkan, Sarper; Yarman-Vural, Fatos T.
Recognition of the the cognitive states by using functional Magnetic Rezonans Imaging (fMRI) data is a challenging problem that has been a focus of scientific research for a long time. In this study the effectiveness of clustering and the ensemble learning techniques on fMRI dataset is investigated and different paramaters are compared. Moreover, the performance of these techniques are tested on both raw voxel intensity values and meshes formed by multiple voxels. Clusters are compared to the functional brain regions, however higher performances are obtained when the number of clusters is higher than the number of functional brain regions.
Citation - WoS: 1
Citation - Scopus: 2
Classification of Low Probability of Intercept Radar Waveforms Using Gabor Wavelets
(Gazi Univ, Fac Engineering Architecture, 2021) Ergezer, Halit; 29339
Low Probability of Intercept (LPI Radar) is a class of radar with specific technical characteristics that make it very difficult to intercept with electronic support systems and radar warning receivers. Because of their properties as low power, variable frequency, wide bandwidth, LPI radar waveforms are difficult to intercept by ESM systems. In recent years, studies on the classification of waveforms used by these types of radar have been accelerated. In this study, Time-Frequency Images (TFI) has been obtained from the LPI radars waveforms by using Choi-Williams Distribution method. From these images, feature vectors have been generated using Gabor Wavelet transform. In contrast to many methods in the literature, waveform classification has been performed by directly comparing the feature vectors obtained without using any machine learning method. With the method we propose, classification accuracies were obtained at intervals of 2 dB between -20 dB and 10 dB and performed at reasonable classification accuracy rates up to -8 dB SNR value. Better results than the best reported in the literature were obtained for some signal types. The results obtained for all waveform types are given in comparison with the results of the existing methods in the literature.

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