Yüksek Lisans Tezleri

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    Citation Count: Mohamed, Mohamed Ali Elghdaffi (2017). A comparative study on residential soundscape perception of Arabic and Turkish people living in Ankara, Turkey / Ankara'da yaşayan Arap ve Türk konut sakinlerinin işitsel peyzaj algıları üzerine karşılaştırmalı bir çalışma. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    A comparative study on residential soundscape perception of Arabic and Turkish people living in Ankara, Turkey
    (Çankaya Üniversitesi, 2017) Mohamed, Ali Elghdaffi; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, İç Mimarlık Anabilim Dalı
    In studying the soundscape perception of the people of a certain acoustic environment, several concepts should be taken into consideration. Studies from the literature suggest that the factors that influence the soundscape perception are the sound environment and the auditory perception mainly. As a person spends most of the time in their houses, understanding the soundscape perception in the residential context is significant. This research investigates the soundscape perception differences of two cultural groups of the same acoustic environment. Therefore, the Arab and Turkish residents of Ankara participated with 405 questionnaires in order to assess their soundscape perception of the sound environment of the city within their house environment. The findings of the study suggest that the sound environment is equally important to both cultural groups, while the Arab residents showed a higher satisfaction level from the sound environment of their houses. Furthermore, the cultural factor demonstrated significant differences in the soundscape perception of the Arab and Turkish groups based on an overall soundscape perception evaluation, sound source loudness, sound frequency of occurrence and sound favourability using statistical analysis such as, one-way ANOVA and t-test.
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    Citation Count: Naji, Hayder Faris (2017). A GIS-based decision support system for locating new train stations in Iraq / Irak'ta yeni̇ tren i̇stasyonu yerleri̇ni̇n beli̇rlenmesi̇ i̇çi̇n CBS destekli̇ bi̇r karar destek si̇stemi̇. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    A GIS-based decision support system for locating new train stations in Iraq
    (Çankaya Üniversitesi, 2017) Naji, Hayder Faris; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, Matematik Bilgisayar Anabilim Dalı
    Railway networks are one of the most necessary infrastructures all around the world. Today, to manage these networks, Geographic Information System (GIS) techniques should be used in order to study and analyze the railway network and its stations. It is very difficult to deal with railway systems by using traditional methods and the results may become inaccurate because of the huge amount of data related to them. In addition, by using GIS techniques in the development of the rail networks, the decision-making process will be improved and supported. Moreover, the results will be accurate because they result from using specific criteria to achieve a defined aim. In this study, the train stations in all of Iraq's provinces were studied and analyzed by using network analysis, which is one of the most powerful techniques within GIS. A GIS-based system was built by using the free trial copy of ArcGIS® software, PYTHON™ programming language, and ASP.Net (C#) programming language in order to develop a full decision-making environment to manage and locate train stations in the country of Iraq. The main methodology for this study is divided into two parts. v The first part identifies the problems in the current stations through the analysis of those stations by using network analysis. The second part determines the best candidate locations for new train stations depending on the number of people around those locations and the distance between those people and the new candidate locations according to the existing road network. In addition, the new locations should be accessible by people who are within a walking time of 20 minutes from the new locations as an accessibility value. The results will be presented as spatial maps, which portray the best locations for new train stations, and tabular data of the areas and the number of people to be served by the new stations.
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    Citation Count: AKKOCAOĞLU, H. (2014). A new customer order scheduling problem on a single-machine with job setup times. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    A new customer order scheduling problem on a single-machine with job setup times
    (2014) Akkocaoğlu Çatmakaş, Hale; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği Bölümü
    In this study, we consider a relatively new class of the customer order scheduling (COS) problem where each order consists of one or more individual jobs. All jobs in the same customer order are processed successively and delivered at the same time to the customer. Thus, the completion time of the last job processed in each customer order defines the completion time of the order. A sequence independent setup is required before the processing of each job in a customer order. However, no setup is necessary before the processing of the first job of a customer order if this first job is the same as the last job of the immediately preceding customer order. We investigate the single-machine problem for two cases in which the makespan, which is the time to complete all customer orders, is minimized in the first case while the total completion time, which is the sum of the completion time of the orders, is minimized in the second case. For some special cases of both problems, we derive the properties of the optimal solution, which can be obtained by priority rules. We show that the makespan problem is polynomially solvable. For the total completion time problem, we develop a mixed integer programming model capable of solving small-sized problem instances optimally and propose a constructive heuristic algorithm that obtains optimal and near-optimal solutions for medium and large sized problem instances. Computational experiments are done to evaluate the performance of our solution approaches in terms of both quality and time. The results show that the mixed integer linear programming model does not seem to be a useful alternative, especially for large-sized problem instances. However, the proposed heuristic algorithms find near-optimal solutions in very short time
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    Citation Count: ASLAN, A. (2014). A performance and functional analysis tool for testing and maintenance of web-based application from the user perspective. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    A performance and functional analysis tool for testing and maintenance of web-based application from the user perspective
    (2014) Aslan, Alper; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Bilgisayar Mühendisliği Bölümü
    This thesis focuses on the performance stability score (PSS) of the Web-Based Application Workflow (WBAW) and gathers the automated virtual user response times, repeated with scheduled periods, to calculate the best successful response interval heuristically. The lack of server-side hardware, network and application resources can affect the end-user Internet browsing experience negatively. This kind of negative effects can be monitored only on the end-user web browser. The virtual user browser scripts can be used to monitor the problems. The name of the application, developed, is called "MyToolset". It is designed and implemented by using the open source technologies. The research on this subject aims to monitor the performance degradation and failures on WBAW weekly, raise appropriate alerts and calculate the performance stability score. Furthermore, MyToolset reports the WBAW failures by taking the snapshot of the end-user browser perspective as evidence. The entire mathematical model is based on the calculation of this idea. Live graphics and comparable charts are used to report the results. After custom consecutive performance degradations and failures occur, MyToolset will raise the alerts. The thesis concludes that the WBAW and PSS is used for monitoring, test automation and helping the capacity planning of server-side resources, WBAW works on, such as hardware, network and applications
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    Citation Count: Müge Gümrah Çoruh (2018). A performance management framework for business analysis / İş analizi için bir performans yönetim çerçevesi. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    A performance management framework for business analysis
    (2018-03-05) Gümrah Çoruh, Müge; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği Bölümü
    A performance management framework for business analysis (BA) is a road map for project managers and business analysts to evaluate their processes while delivering high quality products and services. Performance measurement according to key performance indicators (KPIs) provides insights into how BA process is managed. BA process is one of the supportive processes for project management (PM) and is critical for an information systems (IS) project's overall success. Bottleneck points are highlighted via proper KPIs determined for performance management. The objectives of this thesis are (1) to investigate meaningful KPIs measuring the performance of BA process for IS projects, (2) to provide a four-layer (BA Knowledge Area (KA), Project Management (PM) KA, KPIs, and PM Process Groups) performance management framework, and (3) to investigate requirements engineering elicitation process and create process flow diagrams. Proposed performance management framework is validated by Delphi method and illustrated via a real-life software project. Additionally, insights into business practice are provided for the proposed framework.
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    Citation Count: Al-Shaikh, Nawfal Fathi Abdulqader (2018). Active defense strategy against jamming attack in wireless sensor networks / Kablosuz sensör ağlarında karıştırma saldırılarına karşı aktif savunma stratejisi. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Active defense strategy against jamming attack in wireless sensor networks
    (Çankaya Üniversitesi, 2018) Al-Shaikh, Nawfal Fathi Abdulqader; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, Bilgisayar Mühendisliği Anabilim Dalı
    Wireless Sensor Network WSN been utilized increasingly nowadays due to its benefits and its ability of collecting data from reachable or unreachable fields also if fields fixed or movable. Progressive developments in WSN techniques adds efficiency, reliability and better power management but it still vulnerable and sensitive to some kinds security threats. The most effective threat to WSN is DOS attacks which is detectable but unpreventable yet. An authentication defense approach against DOS attack with additional Jamming attack that prevents transferring data between attacked node in a cluster and cluster head node is considered as a base to develop an algorithm with ability of bypassing attacked path via alternative safe one under control of cluster head to mitigate the False Node Excluding DOS due to jamming attack. Both original and enhanced methods implemented using MATLAB and tested by comparing both results and behavior with arbitrary study case. Enhanced algorithm shows good response in mitigating FNEDOS attack.
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    Citation Count: Hawi, Mohammed Kadhim (2016). An approach to improve the time complexity of dynamic provable data possession / Dinamik kanıtlanabilir veri depolanmasında zaman karmaşıklığını geliştirmek için bir yaklaşım. Yayımlanmamış yüksek lisans tezi. Ankara. Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    An approach to improve the time complexity of dynamic provable data possession
    (Çankaya Üniversitesi, 2016) Hawi, Mohammed Kadhim; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, Bilgisayar Mühendisliği Anabilim Dalı
    In this thesis, we aim to take some actions for alleviating the fears when the data storage over outsourcing, and guarantee the integrity of the files in cloud computing. In this study, we have suggested some ideas to improve FlexDPDP scheme [13]. Particularly, proposed scheme successfully reduces the time complexity for verifying operations between the client and the server. The proposed scheme is a fully dynamic model. We involved some parameters to ensure the integrity of the metadata. In spite of the fact that auxiliary storage expenditure by Client-side (the client stores approximately 0.025% size of the raw file). The remarkable enhancement in this proposed scheme is reducing the complexity. The complexity of the communications and the computations decreased to O(1) in both Client-side and Server-side during the dynamically update (insertion, modification and deletion operations) and challenge operations.
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    Citation Count: ÖZKAPICI, D.B. (2015). An intermodal humanitarian logistics model based on maritime transportation for relief item distribution in Istanbul. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    An intermodal humanitarian logistics model based on maritime transportation for relief item distribution in Istanbul
    (2015) Özkapıcı, Dilsu Binnaz; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği Bölümü
    İstanbul Türkiye'nin ekonomi başkenti ve en kalabalık şehri olup, deprem riski yüksektir. Bir deprem durumunda uluslararası ve ulusal kaynaklardan yardım malzemeleri tedarik edilecektir. Daha önceki çalışmalar, yardım malzemelerinin dağıtımı için, şehri ikiye bölen Boğaz'ı ve İstanbul'da deniz yolu ulaşımının avantajlarını göz önüne almamıştır. Bu çalışmada, İstanbul için, bir deprem durumunda insanların zararlarını azaltmak amacıyla deniz ve karayolu ulaşımını içeren ve bu yolların hasar görebilirlik olasılıklarını da göz önünde bulunduran intermodal bir yardım malzemesi dağıtım modeli geliştirilmiştir. Önerilen matematiksel model denizyolu ulaşımından ve İstanbul'un limanlarından etkin bir biçimde yararlanmakta ve Avrupa ve Anadolu yakaları arasında yardım malzemesi ulaşımına izin vermektedir. Talep noktalarına yardım malzemesi sağlamak için denizde-üs kavramı da kullanılmaktadır. Yerel ve uluslararası kaynaklardan tedarik edilen yardım malzemeleri, ana tedarik noktalarından (Haydarpaşa Limanı, Ambarlı Limanı ve Marmara Denizi'ne yerleştirilmiş bir konteyner gemisinden) doğrudan karayoluyla talep noktalarına (İstanbul'un ilçelerine) taşınmaktadır. Alternatif olarak, yardım malzemeleri denizyoluyla İstanbul'un limanlarına ve daha sonrasında karayoluyla limanlardan ilçelere taşınmaktadır. Tedarik noktalarında mevcut yardım malzemesi miktarına göre değişen çeşitli senaryolar çalıştırılmıştır ve sonuçlar üç performans ölçümü açısından incelenmiştir: (1) bir adet yardım malzemesini taşımak için gerekli ortalama süre, (2) intermodal taşıma yüzdesi ve (3) kullanılan gemi sayısı. Ayrıca, Avrupa ve Anadolu yakaları için tedarik dağılımı oranları üzerine bir analiz ve yalnızca karayolu ulaşımından yararlanan alternatif bir yardım malzemesi dağıtım modeliyle karşılaştırma yapılmıştır. Denizyolu ulaşımı ve denizde-üs kavramlarından yararlanılmasının insani yardım faaliyetlerinde esneklik sağladığı ve önerilen modelin İstanbul için etkili ve güvenilir bir afet yardımı sistemi oluşturduğu görülmüştür
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    Citation Count: Layas, Hetham F. (2017). Analysis of the wayfinding system in a university based tertiary care hospital / Üçüncü basamak üniversite hastanesinde yön bulma sisteminin değerlendirilmesi. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Analysis of the wayfinding system in a university based tertiary care hospital
    (Çankaya Üniversitesi, 2017) Layas, Hetham F.; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, İç Mimarlık Anabilim Dalı
    The ease of wayfinding in a complex environment can be understood by the users of the environment. Wayfinding, as a spatial problem solving activity, in a hospital can become a problem for the first time users. The aim of this study is to analyze the existing wayfinding system of a university based tertiary care hospital from the users' point of views; in other words, to understand the usability of the wayfinding system within the hospital. A questionnaire was administered to the users of the hospital. The results of the study indicated that the majority of the users were familiar with the hospital and spatial familiarity decreased the possibility of getting lost. The users found the number of signs sufficient and they had no difficulty in finding the elevators, staircases, main entrance, departments, information desks, and doctors' rooms since they were legible and visible from the circulation system, except for the academic campus. This study suggests that additional signage and you-are-here maps should be integrated into the wayfinding system of the hospital when an expansion has been done to the hospital layout.
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    Citation Count: Alfalahi, Mohammed Abdulmunem Nsaif (2017).Automatic scoring approach for Arabic short answers essay questions / Arap dilinde metin sorularını kısa sürede cevaplamak için otomatik puanlama yaklaşımı. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Automatic scoring approach for Arabic short answers essay questions
    (Çankaya Üniversitesi, 2017) Alfalahi, Mohammed Abdulmunem Nsaif; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, Bilgisayar Mühendisliği Anabilim Dalı
    There are different types of questions produced by the students in their exams, such as multiple-choice questions, true/false questions, and essay questions which require free text answers. Evaluation and scoring these types of exams traditionally are an exhausting process that takes from the instructors a lot of efforts, time and activities. In this regard, applying automated approaches to evaluate and score exams are essentially required to reduce time and efforts. Although there are many commercial tools for scoring multiple-choice and true/false questions, yet there is lack of approaches and tools for evaluating and scoring essay questions, especially for the Arabic language. In this research, the aim is to propose an automated scoring approach for short answers to Arabic essay questions. The scoring process is based on the similarity between the student's answer and model answer which is provided by the instructor. Cosine similarity measures will be used for this purpose. Cosine similarity is a heuristic evolutionary measure that has succeeded to solve text to text similarity problems. In this research, we will use the word root for each keyword in the student's answer and the model answer in order to achieve accurate results. The proposed approach will be tested on a data set proposed and will be compared to other approaches.
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    Citation Count: GÜNER, N.D. (2013). Balancing and sequencing multi-zone mix model assembly lines. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü
    Balancing and sequencing multi-zone mix model assembly lines
    (2013) Güner, Nizamettin Doğan; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği Bölümü
    Assembly based production has importance for large scale industries of developing countries. Satisfying demand and meeting production due dates of those kind of products are the prime targets of companies. One of the largest bus production facilities of Turkey, MAN Türkiye A.Ş., aims to minimize delivery costs and to meet daily production amounts by preventing delays in assembly operations. In this study, an assembly line design is suggested in order to achieve the company goals by studying single model line balancing and mixed model sequencing problems. Based on the characteristics of real life problem, three mathematical models for line balancing and sequencing are constructed. Furthermore, a heuristic algorithm is proposed for single model line balancing problem. This study is a part of a project that is partially supported by SANTEZ Program of Ministry of Science, Industry and Technology of Republic of Turkey
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    Citation Count: Efkireen, Ahmad B.Musbah (2017). Color preferences of children in a waiting room of a hospital / Hastane bekleme odasında çocukların renk tercihleri. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Color preferences of children in a waiting room of a hospital
    (Çankaya Üniversitesi, 2017) Efkireen, Ahmad B. Musbah; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, İç Mimarlık Anabilim Dalı
    The aim of this study is to understand the children's color preferences in a waiting room of a hospital and to investigate the effect of gender and culture differences on color preferences in the waiting room. The sample group consists of Turkish and Libyan children between the ages 6-17. A questionnaire was administered to the children in order to understand their color preferences and color preferences in the waiting room of the hospital. An original photograph of the waiting room with three different colored alternatives were shown to the children, and the children were asked to indicate their feelings and the most preferred waiting room according to color. The results indicated that the most preferred waiting room for the Libyan children was the green waiting room while the most preferred waiting room for the Turkish children was the white waiting room. The results of this study can be useful for interior architects, designers and hospital owners who give importance to children color preferences in the waiting rooms to reduce stress and anxiety of the children in a hospital.
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    Citation Count: Ahmeida, Gebril Farag (2017). Comparative analysis of ottoman palaces in palestine and Turkey with emphasis on ornamentation / Palatinim ve Türkiye'de Osmanlı saraylarının karşılaştırmalı anasinasyon ile sinema üzerine. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Comparative analysis of ottoman palaces in palestine and Turkey with emphasis on ornamentation
    (Çankaya Üniversitesi, 2017) Ahmeida, Gebril Farag; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, İç Mimarlık Anabilim Dalı
    Ornamentations are a significant part of architecture as it provides information about the structure, its builders and its users. In this research, a review of the ornamentation development in the Eastern Mediterranean region from the Egyptian, Greek, Roman, and Islamic periods is performed, in addition to the specific types of ornamentations in Palestine and Turkey are researched in detail. In order to perform the analysis, a review of symbolism and ornament classification concepts is carried out. Moreover, ornamentations in the Eastern Mediterranean region are rich with affiliations from different civilizations, cultures and communities. Therefore, it is evident from the study that the ornamentations in Palestine and Turkey have been mainly influenced by similar cultural backgrounds, while preserving each country's nature and community. Cases are selected from Turkey and Palestine in which ornamentations are used in four palaces; TopkapiPalace (Istanbul, Turkey), Nemr Palace, Albdulhadi Palace and Toukan Palace (Nablus, Palestine). The results of the analysis show that the styles, classes, types, geometry, and affiliations of ornamentations in both countries have several similarities, while the main differences are found in color, complexity and the impact of the social status.
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    Citation Count: Günce Boran (2018). Customer order scheduling with lot streaming to minimize the total order completion time in a two-machine flow shop / İki makinalı akış tipi üretim hattında müşteri siparişlerinin tamamlanma zamanları toplamının enküçüklenerek kafile kaydırmalı olarak çizelgelenmesi. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Customer order scheduling with lot streaming to minimize the total order completion time in a two-machine flow shop
    (2018-03-05) Boran, Günce; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği Bölümü
    Bu çalışmada, çeşitli ürünleri (işleri) içerebilen müşteri siparişlerini çizelgeleme problemi ele alınacaktır. Bir ürün işlenirken, o ürüne ait her müşteri siparişi alt kafileleri (bir ürünün özdeş grupları) olarak işlenir ve aynı ürünün tüm alt kafileleri aynı makinada aralıksız olarak işlenir ve aynı ürünün diğer alt kafileleri makine 1' de işlenirken, işlenen alt kafileler makine 1'den makine 2'ye aktarılır. Bu durum, aynı ürünün alt kafilelerinin birbirine karışmasına izin vermeksizin iki operasyonun örtüşmesi anlamına gelir (yani bir ürünün ilk alt kafilesi bir makinaya ulaştığında, o ürüne ait tüm alt kafileler tamamlanana kadar başka ürünlerin alt kafileleri bu makinaya atanamaz). Müşteri siparişinde yer alan tüm ürünlerin üretimi tamamlandıktan sonra müşterinin siparişi teslim edilir. Bir müşteri siparişinde son ürün olarak işlem gören son alt kafilenin tamamlanma zamanı, müşteri siparişinin tamamlanma zamanıdır. Amacımız, müşteri siparişlerinin tamamlanma zamanlarının toplamını en küçükleyen iş kafilelerinin sırasını ve her iş kafilesindeki alt kafilelerin sırasını bulmaktır. Küçük ölçekli problemleri optimal olarak çözebilen bir karışık tam sayılı doğrusal programlama modeli ile büyük ve orta ölçekli problemler için optimal veya optimale yakın sonuçlar verebilen tabu arama esaslı sezgisel bir algoritma geliştirdik. Çözüm yöntemlerinin süre ve kalite açısından değerlendirilmesi için yapılan deneylerin sonuçları, önerilen sezgisel algoritmanın çok kısa sürede optimal ya da optimale yakın sonuçlar bulduğunu göstermektedir.
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    Citation Count: ŞİMŞEK, O. (2013). Design and implementation of a 1kw single phase grid tie inverter. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Design and implementation of a 1kw single phase grid tie inverter
    (2013) Şimşek, Oğuz; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Elektronik ve Haberleşme Mühendisliği Bölümü
    Renewable energy sources and their power processing equipments are gaining increasing importance in the market. Excess of energy harvested from a renewable source is either stored for future use or sold to other users that are in need of electrical energy at the time of harvesting. Since storage of excess energy is an ine fficient and costly process, a better way of dealing with excess energy is to transfer the energy to the interconnected power grid by means of appropriate power processing. In this thesis work, design and implementation of a high e - fficiency power processing equipment known as Grid Tie Inverter (GTI) to achieve energy transfer to the grid is studied. The target of this study is to convert low voltage direct current (DC) electrical energy harvested from the photo voltaic (PV) panels to high voltage alternating current (AC). The magnitude and phase of the processed alternating current is then controlled in a way such that the power ows towards the grid with a low DC and low reactive component. To achieve this goal, the voltage of the PV panels is stepped up to an appropriate DC link voltage by using a boost type converter known as the Z-Source. The required DC analysis and transfer functions iv of the Z-Source converter are obtained by the circuit averaging technique and a proportional-integral (PI) regulator is designed and implemented to stabilize the DC link voltage. The stabilized DC link voltage is then converted to alternating current using a full bridge inverter. The required grid voltage and phase information is obtained by digital implementation of a single phase time-delay based synchronous reference frame phase locked loop circuit (TDB-SRF PLL). The control of the current owing into the grid is carried out by using the D-Q synchronous reference frame approach. Hereby, the direct (D) and quadrature (Q) components of the grid current are calculated using Park's transformation. The magnitudes of the D and Q components are stabilized by separate digital PI controllers. The outputs of the PI controllers are then converted back to the rotating reference frame using the inverse Park's transformation. The output of the transformation is used as a control signal to drive the full bridge inverter. The scope of the thesis comprises both the modeling and simulation of the GTI components and the design and implementation of a prototype GTI. A thorough experimental evaluation con rms the practicability of the proposed design
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    Citation Count: Şefika Demirbaş (2018). Determination of identical afad warehouses for faster response in disaster relief / Afetlere daha hızlı müdahale için özdeş afad depolarının kullanımı. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Determination of identical afad warehouses for faster response in disaster relief
    (2018-03-08) Demirbaş, Şefika; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği Bölümü
    Afetzedelere afet sonrasında yardım malzemelerinin önceden konumlandırılmış envanterden sevki sağlanır, bu nedenle depo konumları ve malzemelerin afet öncesi sevke hazır olması afet sonrası müdahalede büyük önem arz eder. Türkiye'nin iklimi, tektonik, sismik ve topoğrafik yapısı nedeni ile sık sık doğal afetler meydana gelmekte ve can kaybı, maddi ve manevi zararlarla sonuçlanmaktadır. Sel, çığ, heyelan ve yangınlar bu doğal afetlere örnek verilebilir, ancak en önemlileri depremdir. Türkiye en aktif sismik bölgelerden biri olan Kuzey Anadolu Fay (KAF) hattı üzerinde yer almaktadır. Depremler, sayılarına ve neden oldukları hasara bağlı olarak Türkiye'de meydana gelen en yıkıcı doğal afetlerdir. T.C. Başbakanlık Afet ve Acil Durum Yönetimi Başkanlığı (AFAD), Türkiye'deki hazırlık seviyesini artırmak,afetlere etkili bir şekilde cevap vermek ve afetzedelere hızlı bir şekilde yardım malzemesi gönderebilmek için 25 farklı ilde konteynır depoları kurmuştur. Depolarda, yatak, çadır, battaniye, kılıf ve mutfak kitleri bulunmaktadır. Mevcut durumda depolar özdeş olarak işletilmemekte ve kapasiteleri verimli olarak kullanılamamaktadır. Depolarda yardım malzemeleri farklı adetlerde stoklanmakta ve bazı depolarda tüm çeşitlerde yardım malzemeleri stoklanmamaktadır. Bu nedenle afet sırasında gereğinden fazla depo kullanımı gerekmekte, müdahale zamanı artmaktadır. Bu çalışmanın amacı, Türkiye'deki afete müdahale operasyonlarında özdeş AFAD depolarının(diğer bir deyişle, her envanter kaleminden yeterli stok seviyesine sahip) kullanımının olası yararlarını araştırmaktır. Geliştirilen konumlandırma ve tekrar atama tipi matematiksel modelle mevcut depo kapasitelerinin etkin ve verimli bir şekilde kullanımı hedeflenmiştir. Kurulan model 3500 farklı senaryo ile 175 adet gerçek geçmiş deprem verisi ile test edilmiş ve sonuçlar üç farklı performans kriteri ile değerlendirilmiştir: (1) talep ağırlıklı toplam mesafe, (2) depo kullanım sıklığı, (3) depoların özdeşe çevrim sıklığı. Bu tez özdeşe çevrilmesi için AFAD depolarının sayısını ve yerlerini önermektedir. Sonuçlar önerilen özdeş depo modelinin önemli kazanımlar sağladığını göstermektedir.
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    Citation Count: ÖZÇETİN, M. (2013). Developing a GIS based crime analysis system. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Developing a GIS based crime analysis system
    (2013) Özçetin, Mustafa; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Bilgisayar Mühendisliği Bölümü
    Geographic Information Systems (GIS) have a lot of applications that are getting more and more importance in our daily life. One of the hot and crucial application areas of GIS is crime mapping. Nowadays, crime rates tend to increase and thus analyzing the crime trends and taking preventive precautions are very important. Often, crimes display spatial or temporal patterns. For instance, some crime types are committed in some areas with a relatively higher density rate. Some others may occur in particular time ranges in a day. Adding geographic support to crime analysis methods can provide extremely valuable and exclusive benefits which tabular or statistical analyses cannot provide. For example, seeing the spatial distribution of a particular crime type or comparing different types of crimes on the map can give critical and important decision making tips for managers. Hence, adding spatial dimension to crime analysis techniques help provide great contributions to police departments. In this study, after doing some researches about crime mapping, a GIS-based crime analysis system, namely Crime Analyzer, has been developed from scratch. Crime Analyzer not only provides various spatial and temporal analysis tools but also presents a flexible method to extract data from various sources such as database systems to solve crime mapping problems. Keywords: GIS Based Crime Analysis, Crime Mapping Software
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    Citation Count: DURMAZ, Ç. (2015). Development of a portable system for the detection of the microorganisms in meat product. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Development of a portable system for the detection of the microorganisms in meat product
    (2015) Durmaz, Çağatay; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Elektronik ve Haberleşme Mühendisliği Bölümü
    This thesis is related to a part of the Ministry of Science, Industry and Technology (MOSIT)'s Industry Thesis (SANTEZ) Program. The specific project number given by MOSIT to the project is 00973.STZ.2011-2. In the thesis, as a part of a Project group, I participated in all the activities of design and development of a new portable device that can detect and identify the food poisoning in a very short time, accurately, and reliably. The research Project Group consisted of the Project Coordinator Prof. Dr. Taner ALTUNOK, who was responsible for the management of the Project and technically all the aspects of the Project, Engin KIRAN, from IDC Company for electronic design and software, Onur ÖÇALAN and Melike AYTÜRK, from IDC company, for software development, and Gamze YAVAŞ and Cansu ÖZDEMİR, from IDC, are the biology experts. My main responsibility was to support the electronic and software design. I developed the image processor software used to identify the bacteria that cause the food poisoning in the images taken by a camera. The device, Biosensor System, was designed, developed and tested by the Project Group successfully. Thus, the SANTEZ Project was successfully completed and was tested and accepted by the MOSIT. The Biosensor System developed within the scope of the SANTEZ Project has extra capabilities to the devices available on the market. The image processing method we developed takes the image of a well where a chemical reaction had taken place by introducing an antigen into the food samples before. When the chemical reaction takes place between the food under test and the antigen in the well, some photons are emitted through the chemiluminescence mechanism. The irradiation intensities of the pixels in the image of the well were measured by an electron-multiplying charge-coupled device (EMCCD) camera. Our method defines the area of the wells identified by a mask, and then calculates the average intensity of all the intensity values belonging to pixels in the well image. A detection of the harmful microorganisms is made if the average intensity pertaining to the well exceeds a limit. A decision indicating a positive detection and identification of the harmful microorganism is made if this average intensity exceeds a threshold value determined
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    Citation Count: Elibiadi, Mohammed S.R. (2017). Effect of daylight on students' behavior in libraries / Günışığının kütüphanelerdeki öğrencilerin davranışları üzerindeki etkisi. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü.
    Effect of daylight on students' behavior in libraries
    (Çankaya Üniversitesi, 2017) Elibiadi, Mohammed S. R.; Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, İç Mimarlık Anabilim Dalı
    Natural lighting is one of the most tried concepts in architecture due to the several psychological and physiological benefits of its utilization on space occupants. Therefore, several studies have shown its positive impacts and superiority to artificial lighting. Moreover, using natural lighting allow owners and facility managers to save up to 40% of the energy used in their buildings. In this research, the perception and impacts of natural lighting is assessed at the library of Çankaya university in Ankara, Turkey. The library has a skylight that allows natural lighting to enter the library during day hours. Through a review of the literature, lighting perception indicators and illuminance measurement techniques are compiled in order to perform a subjective and objective measurement of the lighting in the case space. The library is divided by the researcher into four main zones; A, B, C and D. The findings of the objective illuminance measurement show that cloudy weather reduces the illuminance in the library by 23.1%, while several inadequate illuminances were found in many cases especially in zones A and D. The subjective perception by 120 library users distributed throughout different day periods shows that the lighting perception indicators differed between the different zones. At the end of the study, correlation testing between the subjective perceptions and objective illuminance measurements was performed, which indicated a weak to medium correlation between the two variables.
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    Citation Count: ABDULRAHMAN, B.A. (2014). Effects of e-government and GIS technology for developing services in education sector case study: Schools in Kirkuk City center. Yayımlanmamış yüksek lisans tezi. Ankara: Çankaya Üniversitesi Fen Bilimleri Enstitüsü
    Effects of e-government and GIS technology for developing services in education sector case study: Schools in Kirkuk City center
    (Çankaya Üniversitesi, 2014) Abdulrahman, Bashar Adnan; Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Matematik Bilgisayar Bölümü
    The field of e-government has become an important subject around the globe because it refers to the delivery of government services by means of technology to save resources and bring governments closer to their citizens and to the private sector. This study underlines how most e-government projects require spatial datasets to improve public services. Pertinent examples already found/extant in the literature are examined, and investigating schools locations in Kirkuk city are selected for the case study. In parallel to the literature review, a study of the geographical distribution of schools is shown to be necessary such that land use for educational facilities occupies an unobjectionable part of the Kirkuk urban area, which in turn makes decision makers take this (land) use into account when the government is to establish city master plans. This thesis presents how establishing a working GIS in the education services would improve e-government applications due to the fact that GIS tools and facilities improve flexibility and accuracy in the management of both spatial and non-spatial datasets. As the measurements recognized by the EU and UN show, e-government initiatives need to be prepared above accurate, clean, timely and controlled shared datasets. Therefore, establishing strong databases and making legislative changes to enable data sharing among government agencies are found to be the primary targets of both central and local governments. The thesis shows that establishing a working GIS to provide services to students, teachers, citizens and decision makers in the education sector is technically feasible. However, the starting point ought to be collecting raw data from the field and ensuring that the data is updated in a timely manner, and not acquiring hardware and software. In so doing, Iraq can rank higher in international e-government measurement reports