Yüksek Lisans Tezleri

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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
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
Trajectory generation for open/close gap maneuvers in vehicle strings
(Çankaya Üniversitesi, 2017) Çankaya, Erkam
Cooperative adaptive cruise control (CACC) is an advanced technology allowing vehicle following at a small inter-vehicle spacing. In its classical usage, CACC assumes that vehicles are arranged in the form of a vehicle string and follow each other at a velocity-dependent distance. Nonetheless, practical driving situations include the case of lane changes, where vehicles can join or leave a vehicle string. In such case, it is required that gaps for joining vehicles are provided or gaps after leaving vehicles are closed in order to ensure safe and efficient driving. This thesis is concerned with gap opening and closing maneuvers in vehicle strings. Introducing a suitable control architecture, gap opening and closing maneuvers can be realized by the generation of feedforward input signals. To this end, the first contribution of the thesis is the development of five methods for the computation and representation of gap opening and closing trajectories that fulfill additional safety and comfort constraints. The first method is based on the solution of an optimal control problem, the second method uses a polynomial trajectory and plant inversion, the third method concatenates three polynomials and uses nonlinear programming to determine the polynomial coefficients, the fourth method uses a high-order polynomial and the fifth method uses concatenated polynomials in order to approximate the optimal control solution. A simulation study shows that the fifth method is particularly useful in practical applications since it computes trajectories that approximate the optimal control solution in real-time. The second contribution of the thesis is the implementation of a vehicle model that realizes CACC and additional feedforward signals in the form of a Matlab S-function.
Improvements in the finite element method and method of moments for the solution of electromagnetic problems
(Çankaya Üniversitesi, 2017) Albayaty, Abdullah Omran Ali
In this thesis, two numerical techniques, the finite element method (FEM) and the method of moments (MoM) are improved for solving electromagnetic boundary value problems governed by differential and integral equations. The FEM is a numerical technique used to solve differential equations. The solution domain is divided into small intervals (elements), and the unknown function is calculated by finding an approximate solution by a truncated series of different shape functions. This approximate solution can be replaced with the original function in the differential equation. As a result, we get the matrix of equations that can be solved to obtain separate solution to the problem. In this thesis, we used the sigmoid function as a novel application, and compare the accuracy of FEM with the sigmoid function against the well-known linear and the step functions. Two examples of electromagnetic problems are presented. It is concluded that the sigmoid function under specific conditions yields the most accurate results. For MoM, this thesis presents a new mathematical algorithm for the solution of electromagnetic problems. This algorithm is schemed to be suitable for solving the singularity that exists in the solution matrix. This adaptive integration algorithm aims to avoid the singularity in the evaluation of the integral so called the Cauchy Principal Value integral. An example electrostatic problem is presented and it is proved that the novel method is accurate.
An intermodal humanitarian logistics model based on maritime transportation for relief item distribution in Istanbul
(2015) Özkapıcı, Dilsu Binnaz
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
Suspension design of an unmanned automatic gun shot system placed on a vehicle
(2018) İşcanoğlu, Serkan
tez çalışması ana bölümler olarak, beş kısımdan meydana gelmektedir. İnsansızlaşmanın önemi başlığının altındaki kısımda günlük hayatta insansızlaşmanın önemi ve sonuçları, askeri sahada insansızlaşmanın değeri ve katkıları dahası sonuçları, insansız sistemlerin üstünlük ve buna karşın zayıf olduğu noktalar ve insansız sistemlerin kullanılmasının ahlaki boyutu konuları irdelenmektedir. Askeri sahada insansızlaşma topiği altındaki kısımda, askeri alanda insansızlaşmanın tarihsel boyutu, insansız sistemlerin tanımlanması ve tasnifi, insansız sistemler ve otonomi, hava, kara, deniz ve uzay araçları sınıflarından meydana gelmiş insansız sistemlerin türleri yapıları ve özellikleri; Türkiye'nin sahip olduğu insansız araçlar konuları incelenmiştir. Modern çağdan beri piyade sınıfının ilerlemesi ve savaşlardaki enformatik gelişmeler topiği altındaki bölümde, piyade sınıfının tarihi savaşlardaki kullanılma durumlarına göre irdelemesi yapılmaktadır. En yeni teknolojik ilerlemeler doğrultusunda piyade sınıfının yeni baştan teşkilatlanması başlığı altındaki bölümde planlama, konsept, kadro, araç, silah, teçhizat, enerji gereksinimi ve eğitim alt başlıkları incelenmektedir. Daha sonraki bölümde ise; Türkiye'nin sahip olduğu insansız araçlar, silah yerleştirilebilen araçlar, parametreler, belirlenen bir silah sisteminin monte edilmesi, taşıtın dinamik olarak modellenmesi, süspansiyon seçimi ve süspansiyon tasarımı yapılarak sonuç ve öneriler irdelenmiştir. Bu çalışmada modelleme Solidworks'de yapıldıktan sonra ANSYS programında dinamik analizimiz yapılmış ve geri tepmeli silah tasarımının ne kadarlık bir kuvvete maruz kaldığı ortaya konulmuştur. Aynı zamanda Matlab yazılımında süspansiyon seçiminin yapılması maksadıyla mekanik simülasyon uygulanmıştır.
An approach to improve the time complexity of dynamic provable data possession
(Çankaya Üniversitesi, 2016) Hawi, Mohammed Kadhim
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.
The spatial analysis and ideal evaluation for the school locations in Hilla city using gis to make the best decision
(Çankaya Üniversitesi, 2017) Alfaras, Mohammed Shukur Mahmood
Educational services are vital community facilities due to their significant impact on the life of a city and community; these represent the foundation on which the cultural and social development of the city are based, and improvements to the educational level of a community depend on appropriate attention being paid to the optimization of the spatial distribution and the correct locations of schools, in terms of the existing bases and standards. The aim of this thesis is therefore to carry out a study and analysis of the efficient spatial distribution of educational services within the city of Hilla, to determine the flaws in this distribution, and to identify how to address these on the basis of planning standards. This study also shows that the distribution of schools within the city of Hilla does not include a clear strategy for the spatial planning of those schools, and that the selection of their locations has depended on the presence of vacant spaces and the available possibilities, regardless of whether these match locations based on the accepted criteria in Iraq. Furthermore, there is a lack of spatial planning and well thought-out distribution for schools in terms of population size. In order to optimize the planning of this service, the use of GIS technology is required. This technology is used for the organization of these services, to find the most suitable solutions and to make better decisions. GIS technology is used to achieve a homogeneous distribution of services for the benefit of all citizens in all sectors of society. This work was carried out using the Spatial Analysis for School Locations (SASL) application. The interfaces of the SASL application are designed using Visual Studio 2013, and the processing code is implemented in the Visual C# programming language, using the tools and methods of spatial analysis in GIS with assistance from the ArcObjects library, and relying on a geo-spatial database built using the ArcCatalog v 10.3.1 application to handle and analyse spatial data and to assess the locations of schools, according to a set of standards. The available data was provided by the Directorate of Education of Babylon and other government departments (including the Municipality of Hilla and the Directorate of Statistics in Babylon), for the design of the geographic database.
Comparative analysis of ottoman palaces in palestine and Turkey with emphasis on ornamentation
(Çankaya Üniversitesi, 2017) Ahmeida, Gebril Farag
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.
Kalker ocaklarında ocak sularının ve delme-patlatma işlemlerinin iş sağlığı ve güvenliği üzerine etkilerinin araştırılması
(Çankaya Üniversitesi, 2018) Aykal, Utku Meriç
Bu çalışma ile kalker sahalarında proses gereği tüm çalışmaların, güvenli sürdürülmesi için gereken proaktif yaklaşımlar incelenmiş, kalker rezervi kazanımı için gereken çalışmalar sırasında meydana gelebilecek risk unsurlarının nasıl en aza indirilebileceği araştırılmıştır. Gerekli saha çalışmaları yapılmış ve iş kazaları, "Mühendislik Metotlar Yöntemi" uygulamaları ile asgariye indirilmeye çalışılmış yani olası iş kazalarına kökten tedbir alınmaya çalışılmıştır.
Development of a portable system for the detection of the microorganisms in meat product
(2015) Durmaz, Çağatay
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
Design and implementation of a 1kw single phase grid tie inverter
(2013) Şimşek, Oğuz
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
Measurement of system security issues of private computer networks for different types of attacks
(2015) Aljadir, Taha
In this thesis, two different types of Remote Access Virtual Private Network protocols (PPTP and SSL) have been established virtually using Virtual Lab. In addition, different types of security attacks have been applied to each protocol under the same conditions. For each attack, different tools were applied separately to each protocol. Moreover, the attacks were used to target different components for each VPN. The results were studied carefully, which led to obtaining a good security analysis used later to compare between those protocols under the test conditions and to give recommendations to use each of those protocols
A performance and functional analysis tool for testing and maintenance of web-based application from the user perspective
(2014) Aslan, Alper
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
Trafo merkezlerinde manyetik alan maruziyetleri üzerine bir inceleme
(Çankaya Üniversitesi, 2018) Sağdıçoğlu, Umut Çetin
Artan enerji ihtiyacı ile sayıları gün geçtikte artan ve enerji iletim sisteminin kalbi olarak görülen trafo merkezlerinde görev yapan işletme teknisyenleri işleri gereği manyetik alana maruz kalmaktadırlar. Bu çalışmada, Türkiye'nin çeşitli bölgelerinde 31 farklı "154kV/34,5kV" trafo merkezinde manyetik alan ölçümü yapılarak çalışanların iş sağlığı ve güvenliği açısından maruziyetleri değerlendirilmiştir. Ölçümler düşük frekansta ölçüm yapan TENMARS TM-192D Üç Eksenli Manyetik Alan Ölçer cihazı ile çalışanların yaptıkları farklı görevler için bulundukları noktalarda yapılmıştır. Elde edilen sonuçlar ölçüm noktalarına göre kategorize edilmiş olup, ölçüm sırasında trafo merkezindeki anlık yük durumu da göz önüne alınarak trafo merkezleri arasında karşılaştırmalar yapılmıştır. Karşılaştırma sonuçları ile ulusal ve uluslararası düzenlemelerle belirlenen limit değerler ışığında trafo merkezi işletme teknisyenleri için yüksek maruziyet teşkil eden bölgeler tespit edilmiştir. Ölçümler sonucunda en yüksek maruziyet değerinin eski tip trafo merkezlerinin kapalı şalt hücre önlerinde olduğu görülmüş olup buradaki en büyük etkenin sistem ile personel arasındaki kısa mesafe olduğu tespit edilmiştir. Manyetik alan maruziyetinin azaltılması için, gelişen teknolojinin sağladığı imkanlar dahilinde işletme teknisyenlerinin tüm işlemleri uzaktan kontrol sistemleri ile kumanda odasından yapması faydalı olacaktır.
Noise cancellation using adaptive filter algorithms
(2015) Almallahmed, Omar Mohyalden
The aim of this research is to study the theoretical adaptive filters for noise canceling problem. Firstly, it describes the notion using adaptive filters. Secondly, it presents three more common adaptive filters the RLS, NLMS and LMS algorithms. In addition, it describes the implementation of adaptive filters. Furthermore, the aim of this study is to solve some of the noise problems that affect the performance of the systems. The use of Noise Canceling theories is the most important solution for this problem, and for that research adaptive filters are used to solve these problems. The most important algorithms for these filters are RLS, NLMS and LMS algorithms. The research tests these algorithms with adaptive filters applications (noise cancellation, signal prediction, system identification, echo cancellation), and have chosen the best algorithm based on the value of Mean Square Error (MSE). The research presents two examples of a solution for the noise problem of the voice signal using Simulink MATLAB for different environments. The first example is active noise canceling theory, where, the color noise and then white noise (Gaussian noise) on the audio signal is used, after that three algorithms RLS, LMS, NLMS are applied to the audio signal to detect and cancel both noises. The second example is Channel Equalization, which also applies the three algorithms to solve the very same problem. Finally, the results of this Simulink are discussed and future work is present
Wireless optical wave propagation in underwater medium
(2013) Keskin, Aysan
In this thesis, the effects of the turbulence on the average transmittance are examined when the lowest order collimated Gaussian optical beam wave propagates in a wireless underwater medium. To observe the oceanic turbulence effect, the power spectrum of homogeneous and isotropic oceanic water combining the effects of salinity and temperature is used. Employing the Rytov method and the numeric integration, the effects of the parameters of power spectrum on the average transmittance are analyzed. Obtaining results with the help of Matlab program indicates that the rate of dissipation of the kinetic energy per unit mass of fluid is directly proportional to the average transmittance while the rate of dissipation of the mean-squared temperature is inversely proportional to the average transmittance. Increase in the link distance and decrease in the wavelength reduce the average transmittance. When the temperature-induced optical turbulence is dominant in the ratio of the salinity and temperature contributions to the refractive index spectrum, the average transmittance almost never decreases. However, the salinity-induced optical turbulence reduces the average transmittance sharply. Increasing the Kolmogorov microscale length, first the turbulence effect increases and the average transmittance decreases, but when the value of Kolmogorov microscale is further increased, the turbulence effect starts to decrease and the average transmittance increases, eventually a saturation is observed
Determination of identical afad warehouses for faster response in disaster relief
(2018) Demirbaş, Şefika
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.
Pricing and remanufacturing decisions with speculators and strategic consumers
(Çankaya Üniversitesi, 2017) Yozgat, Simge
We investigate pricing and remanufacturing decisions with speculators and strategic consumers for a single type of a product over a two-period sales horizon. A monopolist manufacturer produces a fixed quantity in the first period. Some of the sold products are returned at the end of the first period, which are collected by the manufacturer and/or speculators. Returned products are remanufactured, and then sold in the second period, along with any new products remaining from the first period. Mathematical models take into account the behavioral patterns of different types of customers to maximize the manufacturer's expected total profit. Solution to the mathematical models show that one particular customer behavior is optimal. Specifically, the manufacturer should use a fixed-pricing policy for all products –new and remanufactured alike– and set the price at the maximum level that strategic customers are willing to buy. This will force customers to wait for the second period to buy any products, and hence, will yield the maximum profit for the manufacturer. Additionally, the manufacturer is better off remanufacturing. The sensitivity analysis has shown that the profit is most sensitive to the number of strategic customers.
Text categorization based on semantic similarity with word2vector
(Çankaya Üniversitesi, 2017) Alsamurai, Ather Abdulrahem Mohammedsaed
With an increase in online information, which is mostly in the form of a text document, there was a need to organize it so that management and retrieval by the search engine became easier. It is difficult to manually organize these documents, therefore, machine-learning algorithms can be used to classify and organize them. Mostly, they are faster, more accurate and less expensive than manual classification. Most traditional approaches of machine learning algorithms depend on the term frequency in determining the importance of the term within a document and neglect semantically similar words. For this reason, we proposed to build a classifier based on semantically similar words in text classification by using the Word2Vector model as a tool to compute the similarity between documents and capture the correct topic. So we built two models by applying three phases: the first phase, we applied preprocessing steps and the second phase, we created a dictionary for top ten categories of Reuters 21578 datasets and the final phase we trained Word2Vector model on the Wikipedia English dataset and use it to compute similarity v between documents. Depending on the results of our study, we found that the second model (the most similar predicted topic) is better than the first model (average based predicted topic) in all categories. When we compare the results of our study with other studies, we found that result of our study is a parallel to the results of other studies, but not overcome them, although these studies use feature selection in the improvement of their results while we use feature extraction in explaining of our results.
Automatic scoring approach for Arabic short answers essay questions
(Çankaya Üniversitesi, 2017) Alfalahi, Mohammed Abdulmunem Nsaif
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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