Browsing by Author "Cengiz, Korhan"
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Item Analyzıng The Performance Of Pure Lateratıon In Indoor Envıronments Wıth Varıous Performance Metrıcs(Ankara Üniversitesi Fen Fakültesi, 2020-12-31) Cengiz, Korhan; Other; OtherNowadays, determining the location of the users and devices in indoor buildings is promising research topic. Accurate position determination of the users for indoor environments is used for numerous applications such as public safety, supermarkets, health care applications, travelling, social networks and tourism. However, global positioning systems created for outdoor localizations cannot be used for indoor positioning systems (IPS) because detecting the exact position of a target is an issue for IPS. For indoor environments, there are several positioning algorithms such as lateration, fingerprinting, dead reckoning etc. Lateration is low cost and easy to deploy when compared to other existing algorithms. Therefore, in this study, received signal strength based pure lateration that uses synthetic data generated from MATLAB is proposed. The performance of pure lateration is investigated in terms of several performance metrics such as effect of varying number of the access points (AP), varying dimensions of the measurement area, varying Gaussian Noise power and varying number of test points in the field. The simulation of the pure lateration algorithm is conducted in MATLAB. The effect of the performance metrics are investigated and discussed in details. According to the results, accuracy performance of lateration is increased when the number of APs increase in the area, however this will bring some hardware costs. In addition, when the number of test points increases in the field, in other words the step size between two test points decreases in the field the error performance of lateration is also enhanced however, this will also cause to computational costs. Finally, enlarging the measurement area causes to decrease the accuracy performance of lateration as expected. The main purpose of this study is to obtain the optimum conditions for lateration to provide a solution for real time applications. For future work, the real time implementations of this study are performed and to improve the accuracy performance, it is aimed to use a curve fitting idea to the measured values.Item Enhanced boost converter with gan based power switches and switched-capacitor(Ankara Üniversitesi Fen Fakültesi, 2021-06-30) Cengiz, Korhan; Other; OtherTo increase the voltage gain of power electronic circuits, several voltage converters have been designed by researchers. Especially, the boost based converters are used by designers for numerous devices and systems because of their reliability. Generally, in these studies, researchers propose to use high frequency transformers, silicon based diodes and inductance based sub-circuits. However, the improvement on new generation power transistors should be considered as an alternative way to provide these goals because of their lower inner resistances, lower switching losses and adoptability for new generation devices. Therefore, in this paper, usage of these kinds of semiconductors to improve the voltage gain performance of traditional boost converter is proposed. With this enhanced design and usage of new semiconductor switches, we obtain approximately 70% more output voltage gain than traditional boost converter. The proposed converter provides significant gain, high scalability in duty cycle vs output voltage usage and portability for weight restricted systems. The enhanced boost based converter is modelled in Simulink to verify the analytical voltage gain equations. Finally, the proposed model is compared with traditional boost converter in term of gain performance.