Yüksek Lisans Tezleri

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

Browse

Filters

2003 - 200942010 - 201519

Settings

Access Right: Open AccessDepartment: search.filters.department.Çankaya Üniversitesi, Fen Bilimleri Enstitüsü, Matematik Bilgisayar Bölümü

Search Results

Now showing 1 - 10 of 23
  • Master Thesis
    On discrete fractional calculus with applications
    (Çankaya Üniversitesi, 2015) Hammood, Hayder
    In this thesis, we present the discrete fractional calculus in the frame of the Delta difference operator and discuss the most important properties and theorems. In order to solve delta fractional difference initial value problems, we discuss the Laplace transform related to this calculus and give the main formulas that are needed to solve such problems. The discrete fractional calculus in the frame of the Nabla difference operators and the related Laplace transforms are discussed and some Nabla fractional difference initial value problems are solved as well.
  • Master Thesis
    Crawling the web using Apache Nutch and Lucene
    (Çankaya Üniversitesi, 2014) Abdulwahid, Nibras
    The availability of information in large quantities on the Web makes it difficult for user selects resources about their information needs. The good link between the internet users and this information is Search engine. Search engine is kind of Information Retrieval (IR). It works on data collection from the Web by software program is called crawler, bot or spider. Most of Search Engines users don't know the mechanism of action the Search Engine, like how Search Engine works and how it catch information in the Web and how it rank the results to users. For this reason in this thesis used the open-source Search Engine is researched in detail. In this study, we used each of (Apache Nutch and Lucene) to clarify work of Web crawling open source. They are released under the Apache Software Foundation. Nutch is a web Search Engine working to search and index Web Pages from the World Wide Web (WWW). Nutch is based or built on top of Lucene. It uses in the information retrieval technology. It has more software libraries to indexing of large-size data. Lucene doesn't care about information existing in the Web, like PDF, TEXT, and MS Word. It is working to indexing these documents and convert them to the data can be utilized. The benefit of using both Nutch and Lucene in this study, they are free and we can their development. The Nutch and Lucene are written by Java language, it is a computer programming language. Furthermore, we used Tag Cloud Technology to analysis and view the Lucene content or its index
  • Master Thesis
    Audio watermarking using DWT of second level decomposition of low frequency and using RMS on approximation coefficients
    (Çankaya Üniversitesi, 2014) Maraha, Heyam Essam Jibrael
    Digital media are distributed through the internet system in a magnificent manner due to the efficiency and inexpensiveness of such a system. Audio clips and other digital signals are transmitted, shared and used easily. This causes a real security problem. Solving this problem leads to finding authentication techniques to provide security for these digital media. Digital watermarking is a suggested solution technique to offer such security for these distributed digital signals. Digital watermarking is the art of embedding information (a watermark) in the original signal, taking into consideration preserving the quality of the host digital signal. There are different types of watermarking media such as image, video and audio; our thesis focuses on audio watermarking techniques. Also, there are a variety of techniques using the watermarking algorithm that depends on the type of algorithm that is used to embed the watermark in the original signal. In our thesis, we have used DWT (Discrete Wavelet Transform) of second level decomposition of the approximation coefficients of each frame. These frames are resulted from segmenting the original audio clips into frames, each one equal to 10 seconds. Also, we have applied the RMS (Root Mean Square) to these approximation coefficients which represent the low frequency of each frame. The aim of using the RMS is to find the higher magnitude approximation coefficients among the segmented frames; then to embed the watermark in a quarter of the selected frames according to the magnitude order. A watermark of 256 x 256 pixels was embedded in two tested audio clips (Pop and Classic) according to the former algorithm. We have applied 17 attacks that try to remove or modify the watermark that is hidden in the original audio clips. Also variety of models such as subjective and objective models were applied to evaluate the efficiency of the proposed algorithm results. The results of the proposed watermarking technique show an effective robustness against most of the applied attacks, especially in MP3 Compression, Quantization, Additive Noise, Resample and Low Pass Filter; however, it shows fragile robustness in Time Stretch and Pitch Shift attacks
  • Master Thesis
    Management of electronic commerce and website application in electronic products marketing in Iraq
    (Çankaya Üniversitesi, 2014) Ibrahem, Ahmed
    The consumer -to- consumer is one of electronic commerce (e- commerce) types. The primary aim of an e- commerce site is to buy and sell goods and services online. The purpose of this study is to design a web based interface for online shopping in Iraq. It is an open market between consumers to consumer shows us how to market electronic products. This system designed by using PHP language and MySQL server for database. The finding of this research is the application enables consumers to sell their product online. Also, the website facilitates buying and selling on the Internet, saving time, search for a product, saving the cost of transportation, as well as the possibility of adding a product by the customer. Further, in this website can post buying and selling through social media and sharing information with (Facebook and Twitter). Also, shopping cart is important for every online shopping, it facilitates to add and delete a product with shopping. Finally, customer should participate in the website as a member registering by username and password number for each customer to be able shopping
  • Master Thesis
    Principles of designing adaptable smart computerized system
    (Çankaya Üniversitesi, 2014) Wareed, Musaab Amer
    The aim of this thesis is to design and implement a smart system that used for controlling a number of electronic devices and sensors remotely and to receive alerts when fire, movement and abnormal temperature and humidity are detected by sensors. The controlling operation on devices will be by using a mobile phone through sending SMS to the smart system. Also the alerts will be received as SMS form from the system. Originally, the smart system contains two main parts which are Arduino microcontroller and GSM modem. The Arduino is responsible for controlling electronic devices and sensors which are interfaced with it. The main function of second main part that called GSM is to deliver SMS which exchanged between the mobile phone and microcontroller. The Arduino microcontroller reads the data of sensors, when it detects abnormal values it will inform the GSM which in its turn will send SMS to the mobile phone to inform the user of system about the situation. The smart system can be controlled from any mobile phone model and can be putted in any place. All in all, a security and easier life can be provided by this smart system
  • Master Thesis
    Binary image watermarking on audio signal using wavelet transform
    (Çankaya Üniversitesi, 2014) Rashid, Rakan Saadallah
    Digital watermarking approaches have recently become an important field of study in a number of practical applications. Generally, digital watermarking is the process of embedding particular information data into other signal data in such a way that the quality of the original information data is maintained. Watermarking can be performed on images, video, text, or audio to protect them from copyright violation. Among all of these types of watermarking, audio watermarking is difficult since the quality of such signals is highly affected by the watermark code. This thesis introduces some approaches that have features and may be applicable for audio watermarking. Generally, the digital audio watermarking approaches may be performed in either the special domain or the transform domain. The approaches that are based on the transform domain are gaining more attention due to their robustness or resistance to attackers. The most commonly used transforms for achieving digital audio watermarking are discrete cosine transform (DCT), short-term Fourier transform (STFT), and digital wavelet transform (DWT). In this research work, the main attention is paid toward digital wavelet transforms such as Haar and Daubechies-4. In addition, this thesis investigates the process of embedding a binary image into various audio signals such as speech and music signals. The values of the pixels in the binary images are either 1 or 0. These pixels are inserted into samples of the speech signal in such a way that the quality of the speech signal is preserved. One main reason to consider the audio watermarking approaches in the wavelet domain is that many modern multimedia standards such as JPEG2000 and MPEG-4 are based on the discrete wavelet transform. These common standards have brought new requirements such as low bit-rate transmission, coding, and many other advantages. Finally, experimental results are presented to validate the performance of the proposed watermarking approach and to compare its performance with other related watermarking approaches. The results show that the performance, in terms of signal-to-noise ratio (SNR) and normalized correlation (NC), of the proposed watermarking approach outperforms other approaches based on DCT. In addition, the results show that the extraction process of the hidden code becomes complex when considering any signal processing operations such as MP3 compression and high pass filtering. The worst case is when using a high pass filter where the recovered binary image is not satisfactory
  • Master Thesis
    Developing an efficient stream control transmission protocol (SCTP) multi-streaming using pluggable priority algorithm for network optimization
    (Çankaya Üniversitesi, 2014) Al-Hadeethi, Abdulbaqi Khashea
    This thesis introduces a pluggable priorities algorithm for the SCTP protocol(PP-SCTP) as a method of reducing delay in the transmission of main data during periods of low bandwidth access. The SCTP protocol in the transport layer uses a Round-Robin or First-Come, First-Served method to transfer the data. These methods do not provide efficient and flexible choices. We set the priority of the streams in accordance with client demand. The PP-SCTP is useful for applications that send different types of data, such as still images, video, text, and documents. The goal of this thesis is to obtain a more flexible and more efficient choice for the end user or customer. The problem germane to this thesis lies in the transport layer, examples of which include the SCTP protocol with multi-streaming. Coding was written to test the various combinations and permutations of algorithms and protocols. In Chapter 5, we discuss the results of our work with the PP-SCTP priority algorithm, most notably its greater efficiency and the reduction of average latency in comparison to other algorithms and protocols in various combinations and permutations, including the First-Come, First-Serve data transfer method
  • Master Thesis
    Performance indicators to consider while selecting cloud database service provider
    (Çankaya Üniversitesi, 2014) Ali, Abbas Hussein
    Cloud computing is a new technology that provides software and hardware resources depending on customer specifications. A cloud database is one of the services that a cloud provider may offer. Many service providers are available on the market; however, selecting a qualified provider is an issue for customers. Performance indicators can be used to represent, measure, and compare the quality of service providers, which leads to creating a broad understanding among cloud service providers. This thesis proposes performance indicators to evaluate cloud database service providers. The first general attributes mostly related to software as service depending on the Service Measurement Index (SMI), then cloud database attributes are introduced. As a limitation of the scope of this thesis, the performance indicators have not been tested in an organization using cloud database service. The performance indicators are suggested to help customers while selecting suitable service provider to their requirements
  • Master Thesis
    Investigation of resource usage and video quality with different formats in video broadcasting
    (Çankaya Üniversitesi, 2014) Shamaya, Hazar Jalal Yaqo
    Transfer of video through an Internet network is one of the greatest challenges faced by the users, especially when dealing with broadcasting e.g. online broadcasting, and large video sizes. Video codecs make this operation easier. In this thesis, we submit the video compression issue to bring us closer to a better outcome/solution by asking the question: "Does compressing videos before sending to the client have considerable benefit?" The experiment methodology we follow is to capture video from multiple web cameras, encoding this video in one server in order to transfer it to another server, and from the second server we can transfer this video to all users wirelessly. Moreover, we can apply this operation to send more than one video to multiple users. The literature surveyed has helped the researcher to view ideas such as using the MVC (Multi-View Video Coding) and UDMVT (User Dependent Multi-View Video Transmission) codecs to compress video, and how to carry out multi-video, in addition to see the effectiveness of wired and wireless modes of video transfer. The researcher used the MVC codec to transfer video, and we can see the effectiveness of transferring video via wired and the effectiveness is reduced in the wireless mode. UDMVT was not used due to the fact that a number of algorithms required for this codec and they could not be obtained. However, the UDMVT codec may be an avenue of exploration in future studies
  • Master Thesis
    A modified securtiy approach for web application used for the registration of the student at Çankaya University
    (Çankaya Üniversitesi, 2014) Sosa, Ali Sami
    This thesis goal is to design and implement a modified security approach for web-based system for student's registration in Natural and Applied Science Institute of Çankaya University Web application that help students to register by using the Internet..The employee can also use this application to track follow student status by monitoring the student information and give a report for each user, this proposed application can reduce time and effort for the users.The proposed application system can also be applied on smart devices (Iphone and Ipad)