Matematik ve Bilgisayar Bölümü Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/222

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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.
A GIS-based decision support system for locating new train stations in Iraq
(Çankaya Üniversitesi, 2017) Naji, Hayder Faris
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.
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.
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.
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
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
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.
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.
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.
Unified threat management (UTM): A comparative study
(Çankaya Üniversitesi, 2017) Ahmad, Ahmad Ayid
Network security has been the foremost need of the technologically advanced world, when considering the implications in the business environment. It has been affirmed that the business enterprises have intensively become susceptible to the data theft or data breaching attacks over the internet; thus, credibility of the processes has been affected. Businesses that lack in being considerate towards the competitive needs of the strategies tend to face declining performance. It leads to the assertion that the decision making process of the businesses must be based on the deployment of continuous improvement prospects. In this thesis, we assessed the business stance of an Imaginary Organisation that led to the assertion that the current network infrastructure of traditional firewall needs to be upgraded. The existing traditional firewall has been disabled to standing against security threats such as Denial of Service, SQL injection, email viruses ..etc. Therefore, the study has been proposed to the migration plan of an Imaginary Organisation network that serve 200 users with developed security services. The plan has been presented to the UTM as advanced features security solution. In order to select the best UTM that satisfied the demands of an Imaginary Organization security requirements, a comparison study among four commercial UTMs has been held. This study achieved by using a virtual lab that consistent from a multi virtual machines that was used as a test environment. The four UTMs have been assessed based on the attributes of visions, execution, ease of use, web-interfaces, device performance, throughput capacity, intrusion prevention system features along with the guaranteed elements of security and many other factors. The experimental work includes installation and test of the software's such as SONICWALL, SOPHOS XG Firewall, WarchGuard, and Palo Alto Networks. The researcher also analyses the impacts of Gartner's reviews along with testing lab result to come out with conclusions that the UTM device called SOPHOS XG Firewall was the best tested device based on study criteria. This device provides the most significant security features affordably. SOPHOS XG Firewall provides the security features such as email protection, Unknown Application Identification, along with the element of Full-Featured Web Application Firewall that able to prevent SQL injection attacks and Denial of service ..etc which traditional firewalls and other UTMs may not be capable of doing. Moreover, the study has presented details in this regard, along with the clearly articulated recommendations as well.

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Browsing Matematik ve Bilgisayar Bölümü Tezleri by Department "Çankaya Üniveristesi, Fen Bilimleri Enstitüsü, Matematik Bilgisayar Anabilim Dalı"