Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/15956

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2016 - 20177

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Access Right: Open AccessDepartment: search.filters.department.Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, Matematik Bilgisayar Anabilim Dalı

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Now showing 1 - 7 of 7
  • Master Thesis
    On left-definite sturm-liouville equations
    (Çankaya Üniversitesi, 2017) Aras, Atilla
    Sturm-Liouville equations are very important to understand the nature of the real-world problems and have been investigated by many authors. To investigate the spectral properties of these problems it is convenient to construct the Hilbert space. Such a construction is done with the help of the weight function. In 1992, A.M. Krall studied on the second order equation -(pg′)′ + qg =λwg, where p, q, w are real-valued functions with 1/p, q, w > 0 on the given interval [c,d] subject to some boundary conditions in the Sobolev space. Such equations are called left-definite equations. He also investigated the left definite fourth order equations and Hamiltonian systems on the finite intervals. Moreover, Race and Krall studied on the Weyl theory for a left-definite second order equation. Using these obtained results second-order, fourth-order equations and Hamiltonian systems are studied on finite and infinite intervals in this thesis.
  • Master Thesis
    An evaluation of three search engines (google, yahoo, bing) based on arabic user perception
    (Çankaya Üniversitesi, 2017) Azeez, Suad Shatti
    With the rapid increase of Arabic users around the world, a need of understanding the preferences of this wide Stratum of society is important. To do so we designed a questionnaire to evaluate three search engines (Google, Yahoo, and Bing) to reveal the Arabic user's perception of these three search engines. Each engine has its own features and it is own search methods to achieve the main purpose of search engines which is retrieving relevant results. This study exposes the pros and cons of the three tested search engines which give the opportunities to search engine developers to enhance their products. The results showed that Google performs very well comparing with Yahoo and Bing in some kind of data (text and video search) whereas image and advertisements Yahoo seems to be more accurate, Bing captivated many participants with its attractive homepage and useful features except supporting Arabic language in Bing map. Our results will help engineers and designers to improve their search engines in term of the design of homepages and result, improving their search engines algorithms for Arabic queries.
  • Master Thesis
    A systematic review of interactive information retrieval evaluation studies, 2007-2016
    (Çankaya Üniversitesi, 2017) Alyaseen, Haider Ali Hasan
    Since the last mid-century researchers start investigate in the performance of IIR (interactive information retrieval). Many methods and measures were innovated and used in this field studies. To ensure the replication of maturation researches there are several factors that effect on the maturation of researches such as introducing standards for measurement and analysis, and understand past endeavors. In this study, we analyzed a vast range of papers within the period (2007-2016), where 1110 papers were examined manually and only 78 articles were included. Based on the achieved results in our study, we found that the researchers increased their concentration on IIR evaluation. Due this expansion of researching in this topic, we noticed that researches used some new techniques and datasets for evaluation of IIR systems. Most of the included papers were conducted based on the help of participants and questionnaires.
  • Master Thesis
    A comprehensive comparison of NOSQL and relational database management systems
    (Çankaya Üniversitesi, 2017) Taha, İhsan Ahmed
    In the last four 'decades, relational database management systems have been used widely to manage structured data in different disciplines. Nowadays, data resources increase rapidly in different forms (including structured, semi-structured and even unstructured data), requiring us to find another way to manage data. NoSQL database management systems previously were exhibited a few years ago, to meet the requirements of a variety of data forms. Many papers, and blogs have claimed that there is a trade-off between using relational database systems and non-relational database systems (NoSQL). In this study, we propose a novel investigation of the performance of relational and non-relational database systems in terms of the main operations that every database performs, such as insertion, reading, updating, and deleting by using the recent version of Yahoo Cloud Serving Benchmark (YCSB-0.9.0) in order to evaluate the performance of MySQL (RDBM) versus Mongo DB and Apache Cassandra (NoSQL). A testing environment is set up for each workload and the responses for each database management system used in the study are examined for each workload. It is worth mentioning that, although we use the latest version of Yahoo Cloud Serving Benchmark, it does not support the latest release of most database management systems, be they relational or non-relational. The results of this study show that the performance of each system differs due to the differences in their respective data storing mechanisms. In addition, the results of this study present the weaknesses and strengths of each database system used in the study.
  • Master Thesis
    Sentiment analysis of Arabic students feedback throughout the semester
    (Çankaya Üniversitesi, 2016) Khudhair, Ali Hadi
    Nowadays, sentiment analysis has become a significant area of research related to machine learning and natural language processing, where sentiments and opinions about several topics are available on the Internet. This allows many parties such as companies, customers or governments to gauge and assess thousands of online opinions automatically. Sentiment on Arabic text is still some way behind that of English, mainly due to the inherent challenges in the language. We apply sentiment analysis to higher level education, by taking feedback from Arabic-speaking students every week during the semester in the form of 'Tweet'-like comments. This also has the benefit of allowing the students to express their opinion in their mother language to obtain a good quality feedback and alert the lecturer to any issues. The research shows that using sentiment analysis gives realistic sentiment values for the students' feedback, mainly due to the high accuracy of the Arabic sentiment lexicon. Over time the sentiment fluctuated in a plausible manner given the order of content presented.
  • Master Thesis
    Analysis of hybrid dynamical systems with an application in biological systems
    (Çankaya Üniversitesi, 2017) Tahar, Noura A. Abdulrazaq
    There are many complex dynamics appearing in nature science and technology one of the most useful approaches to model these phenomena is hybrid dynamical systems hybrid dynamic systems describe the interactions of continuous and discrete variables regulating each other ın this work we have looked at different types of hybrid systems that have been used in the modeling of biological systems we have also looked at the stability analysis of these systemsandhave given an example of a subclass of hybrid piecewise linear systems and checked the stability of these systems through an example
  • Master Thesis
    Mathematical models and heuristic algorithms for a multi-product lot streaming problem in a two-machine flowshop
    (Çankaya Üniversitesi, 2017) Akdoğan, Şahika
    In this study, we consider a multi-product lot streaming problem to minimize the makespan on a two-machine flowshop environment in which all product lots are processed by Machine 1 and then by Machine 2. Most of the current studies in the literature of the multi-product lot streaming problem assume that the number of sublots for each product is known in advance, and determines the size for each sublot of every product and the sequence of sublots of all products. However, in our study we assume that the total number of sublots for all products is known advance, although the number of sublots for each product is not known in advance. Our problem is to determine the number of sublots for each product, the size of each sublot and the sequence of sublots that gives the minimum makespan. We investigate this multi-product lot streaming problem for two cases in which sublots of each product are equal sized in the first case while sublots of each product are unequal sized in the second case. We develop mixed integer linear mathematical models and heuristic algorithms for solving each case. We compare these solutions of mathematical models and heuristic algorithm. We design computational experiments to evaluate the performance of our solutions approaches in terms of makespan time. The results show that the mixed integer programming models do not seem to be a useful alternative, especially for large scale problem instances. However, our proposed heuristic algorithms find optimal or near-optimal solutions in very short time