Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis A Blockchain Application for Payment and Traffic Management in Smart Vehicles(Izmir Institute of Technology, 2022) Yiğitbaşı, Boğaçhan; Ayav, Tolga; Ayav, TolgaThe proposed solution offers an alternative way to our current retail shopping of fuel fees. It can be applied to any retail shopping process but this phase of the project is considered an initiation of upcoming. The next phases of the project, include full integration with smart cars in order to handle all procedures automatically. In the traditional way, when you buy some gas from a station with your credit card, the station owner pays some fee to his bank and it has to wait for some time to be able to get that money. You as an individual have to expose your identity so they can track your shopping habits and follow your expenses. Sometimes they may offer some loyalty discounts or gifts but with really ridiculous rates. Our system offers a digital payment system based on the Ethereum blockchain. It has its own token called TRANT (Transport Token) and by this token, any client with a digital wallet (Metamask) is able to pay their gas fees without exposing their real identity -only their wallet address-, and get some rewards in terms of TRANT for their loyalties and using our DEX (Decentralized Exchange) exchange them into the ether which can be converted into real fiat money easily. On the other hand, the proposed solution also has some advantages for the other party in this equation such as gas station owners, they immediately get their money at that very first moment without any remittance.Master Thesis Evaluation of Scheduling Architectures for Osek/Vdx Compliant Hard Real-Time Operating Systems(Izmir Institute of Technology, 2020) Saydam, Berkay; Ayav, TolgaTechnological advancements are reflected to the vehicles as well, but it brings the challenge of adding new functionalities to vehicles without compromising safety. Tasks are used to provide functionalities which are used in car. These tasks have different characterictics. Safety and performance are two main criteria to determine characterictic of tasks. Characteristics of tasks can be classified according to their safety levels which are known as Automotive Safety Integrity Levels. Designing of hardware and software and also testing them is a long progress in automotive industry. Any changes on the design of hardware is quite costly when an ECU began to be used in field. According to my hypothesis, scheduling algorithms which are used by Central Processing Unit to determine sequences of task executions, should be well known. Besides, designing of hardware and software should be done according to these characteristics and algorithms. If not, tasks will cause serious problem like missing deadline for safety-critical component. In this thesis, the scheduling architectures are evaluated and they are determined which scheduling architectures should be used for which purpose. Besides, the advantages and disadvantages are explained.Master Thesis Blockchain Application on Loyalty Card(Izmir Institute of Technology, 2020) Sönmeztürk, Osman; Ayav, Tolga; Erten, Yusuf MuratToday, traditional loyalty systems are insufficient to meet the needs of users. The users need to stay within the loyalty system for a long time and accumulate points in order to win prizes and besides, the rewards they receive may be out of their interest. In addition, users usually forget the awards they have won in traditional loyalty systems and have difficulty in following up rewards. In addition to that, users usually do not prefer to share their personal information to join loyalty systems due to privacy concerns. Therefore, the number of customers in the loyalty systems is decreasing day by day. The designed loyalty program mentioned in this thesis works with IZTECH Tokens, which works on the Ethereum chain and are created by following ERC20 standards. Thanks to the new generation loyalty system, users can convert their earned tokens to Ethereum on the stock exchange without accumulating them or can receive services or products with the accumulated tokens according to their interests from a market that has been contracted by the manufacturer. Additionally, users in the designed system do not need to carry many cards, it is adequate to have only one Ethereum wallet. Furthermore, users do not need to share any personal data to join the loyalty system. Markets can request Ether from the manufacturer according to the number of tokens they have accumulated. The loyalty system mentioned in this thesis not only aims to establish a win-win relationship between the manufacturer, market, and client but also to find solutions to the customer problems mentioned above.Master Thesis Block-Chain Based Remote Update for Embedded Devices(Izmir Institute of Technology, 2019) Kaptan, Melike; Ayav, Tolga; Erten, Yusuf MuratThis research work is an attempt to devise a platform to send automatic remote updates for embedded devices. In this scenario there are Original Equipment Manufacturers (OEMs), Software suppliers, Block-Chain nodes, Gateways and embedded devices. OEMs and software suppliers are there to keep their software on IPFS (Inter Planetary File System) and send the meta-data and hashes of their software to the Block-Chain nodes in order to keep this information distributed and ready to be requested and used. There are also gateways which are also the members of the Block-Chain and IPFS network. Gateways are responsible for asking for a specific update for specific devices from IPFS database using the meta-data standing on the Block-Chain. And they will send those hashed secure updates to the devices. In order to provide a traceable data keeping platform gateway update operations are handled as a transactions in the second block-chain network which is the clock-chain of the gateways. In this study implementation of the two block chain shows us that, even though the calculation overhead of the member devices, with regulations specific to the applications block-chains provide applicable platforms.Master Thesis Implementation and Performance Analysis of Contex-Aware Role-Based Access Controls for Cloud-Based Iot Platform(Izmir Institute of Technology, 2019) Döşemeci, Mete Merthan; Ayav, TolgaIoT has received substantial attention in both industry and the scholarly world in the recent years. The main idea is to interconnect the physical world with the digital world. Sensors read physical world and present processible data. This data needs to be secured. Currently, most of the cloud based IoT platforms use some sort of Role-Based Access Control (RBAC) , which is one of the approaches to control access to the devices, hence the data. In some cases RBAC is insufficient for fulfilling constantly changing requirements of IoT. ABAC (Attribute Based Access Control) can be flexible enough for fulfilling. However ABAC requires higher level of maintenance. We wanted to implement a access control method that uses both RBAC’s and ABAC’s advantages. We called it OBAC(Operation Based Access Control). Authorization is being implemented in a plug and play manner. We implemented that way because; It is designed for cloud platforms and we wanted to switch between access control methods easily. The results of the experiment shows that proposed access control(OBAC) had minimum latency and management steps across other access control methods.Master Thesis Effectiveness of Using Clustering for Test Case Prioritization(Izmir Institute of Technology, 2019) Günel, Can; Ayav, Tolga; Ayav, TolgaSoftware testing is one of the most important processes in the software development life cycle. As software evolves, previous test cases need to be re-executed to make sure that there is no new bugs introduced and nothing is broken in the existing behaviours. However, re-execution of all test cases could be expensive. That is why, test case prioritization method can be used to detect faults earlier by prioritizing the test cases which could have the higher possibility than others to find faults. Studying different approaches, implementing different techniques or putting these techniques to test on different programs could make it easier to answer which technique should be used for which kind of programs or faults. We address this issue, focusing on selecting different test case prioritization approaches and calculating the average fault detection ratios of prioritized test suites. As a novelty, we propose to perform an optimization algorithm on one of the approaches called `Clustering` to increase its efficiency. To do that, our main objective is determined as maximizing the distance between each clusters by using the coverage information. The distance is measured as the difference of covered functions of test cases in a test suite. In the end, this study will give a hint about selection of test case prioritization technique to be used by checking the empirical results of the experiments.Master Thesis A Learning-Based Demand Classification Service With Using Xgboost in Institutional Area(Izmir Institute of Technology, 2019) Gürakın, Çağrı; Ayav, TolgaThis study, purposes to explain the development stages and methodology of data classification service that has a text-based adaptable programming interface. One of the successful classification algorithms, XGBoost, was preferred in the study. The dataset that is used in the study obtained by 'Digital Business Tracking Application' of a name anonymized company. The dataset is tested by using different classification algorithms and detailed performance evaluation was conducted. As a result, highest accuracy rate is obtained with 'Data Classification Service' which was developed by using XGBoost algorithm.Master Thesis A Dedicated Server Design for Physical Web Applications(Izmir Institute of Technology, 2019) Abdennebi, Anes; Ayav, TolgaWith the huge impressive technological improvements the world is witnessing where giants like Facebook, Google, Apple, Microsoft and other technology companies are offering different services to millions of clients, services which don’t take usually more than seconds to be within the users’ devices besides the Physical Web applications that makes things interacts, having entities and can be reached based on the proximity context without omitting the incoming IoT infrastructure that would make 20.4 billion devices connected by 2020, the amount of data transferred, and services provided will be enormous and along with that, the big energy consumer standing behind providing clients with the needed data and services instantly, the web servers. Although it has a magnificent performance and responds to billions of queries and requests, however, there is still a crucial point which must be highlighted, the remarkable amounts of energy consumption by these servers. Therefore, this work is proposing a new approach in order to reduce the energy consumption in such a scenario where the 18-core energy efficient computer Parallella board will be used in order to create an energy efficient server that can offer many services triggered by various devices or any ordinary web requests across any environment and to prove also that using a cluster of Parallella supercomputers may perform as other similar servers dealing with web content (e.g. Raspberry Pi server). We will show how would these boards work under low energy feeding where users can access a web content hosted on a Parallella cluster. The source codes of the project are available on GitHub.Master Thesis Assessment and Certification of Safety Critical Software(Izmir Institute of Technology, 2018) Uzun Yenigün, Bengisu; Ayav, TolgaBiomedical engineering which consists of combination of various dicipline such as chemical, biology etc. produces remedies to the challenges facing the globalizing world. Therefore, it covers a wide range of area from biosensor to surgical robots. Rapid development of biomedical engineering technology is aimed to research, diagnose and treatment to modern society for providing improved living conditions. Safety critical systems are interested with systems whose failure or malfunction could cause death, serious injury, damage to equipment and environmental harm. NeuRoboScope project is a safety-critical system which navigates the optical-camera system used in the endoscopic pituitary surgery by tracking the surgery tool that the surgeon uses. This thesis gives the information of how we scrutinize NeuRoboScope project depending on standards of medical device which are ISO 14971, IEC 62304, IEC 60601 and DO-178C.Master Thesis Test Case Generation From Cause Effect Graphs(Izmir Institute of Technology, 2016) Kavzak Ufuktepe, Deniz; Ayav, Tolga; Ayav, TolgaCause-effect graphing is a well-known requirement based testing technique. However, since it was introduced by Myers in 1979, there seems not to have been any sufficiently comprehensive studies to generate test cases from these graphs. Yet there are several methods introduced to generate test cases from Boolean expressions. This thesis proposes to convert cause-effect graphs into Boolean expressions and find out the test sets using test input generation techniques for Boolean expressions, such as MI, MAX-A, CUTPNFP, MUMCUT, Unique MC/DC and Masking MC/DC. Generated test sets are compared by using mutation analysis according to their fault detection capabilities. Myers’ original test generation technique is also implemented and included in the mutation analysis. A tool is created which allows to generate test cases by using the implemented algorithms. The tool gets a “.graphml” file representing a cause- effect graph as an input and gives the generated test set as an output. In addition, mutation analysis can be done with the implemented tool. 14 Requirements of TCAS-II are used as an experiment. Results of the mutation testing for these requirements showed that MUMCUT technique has the highest mutant detection success for all fault types. Moreover, Unique MC/DC technique has detected highest number of mutants per test case.