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Öğe Detection of respiratory signals according to different positions using acceleration sensor(Institute of Electrical and Electronics Engineers Inc., 2015) Sumbul, H.; Yuzer, A.H.In this study, a data acquisition system that recording of the movement of diaphragm was designed. At this microcontroller circuit, an acceleration which has ability to define position by using 3-axis Cartesian coordinate systems was used. The information obtained from the sensor, saved to the internal eeprom and transferred to the computer via USB. These data which were received to the computer, were grouped to the axis and plotted by the computer program which is developed at C # programming language. Patient position can be detected as well as the breathing signals form corresponding graph. Hence, it is easy to monitor, at which position and at which duration the patient is making effort. This ability gives us advantage to use this system for sleep apnea study. Meantime, the data transferred to the computer can also be saved in a text file in order to use in Matlab program to investigate both time and frequency analyzes. Since the developed system is portable, it can be used for a number of other study and research. © 2015 IEEE.Öğe Measuring of diaphragm movements by using iMEMS acceleration sensor(Institute of Electrical and Electronics Engineers Inc., 2016) Sumbul, H.; Yuzer, A.H.With the development of technology, in the diagnosis of many diseases, electrical signals measured from different points on the human body, offered to doctors by making meaningful with the help of different algorithms. This is quite important for both safer for the patient to be diagnosed more quickly. This paper presents a data acquisition system which has ability to measure and record the movement of diaphragm. The developed measuring device was connected on the five patients whose have different features (age, tall, weight) and the diaphragm movements were monitored. It is showed that the shape of recorded data by the developed system is similar to shape of recorded data by using industrial spirometer instrument. Besides breathing signal, some parameters (FVC, TVC) that play an important role in the detection of some diseases such as COPD also has been obtained and shared at the measurement results section. As a results, our developed system seems to measure and record the breathing movements and some respiratory parameters with great reliability and inexpensive, portable, easy to use. © 2015 Chamber of Electrical Engineers of Turkey.Öğe Memory polynomial with shaped memory delay profile and modeling the thermal memory effect(Institute of Electrical and Electronics Engineers Inc., 2013) Yuzer, A.H.; Bassam, S.A.; Ghannouchi, F.M.; Demir, S.This paper presents a proposal for a new memory polynomial modeling technique with non-uniform delay taps to capture the thermal memory effects in power amplifiers. In the proposed modeling structure, each order of the memory polynomial is assigned a different memory delay. The delay profile is an exponentially shaped function, instead of equal unit delays for all memory polynomial branches. Three different metrics, the memory effect modeling ratio (MEMR) and the normalized mean square error (NMSE) and spectrum error (SE) are used to benchmark the proposed exponentially shaped delay profile memorial polynomial model performance against previously published models, namely the memoryless, the unit delay and sparse delay memory based polynomial models. The model coefficients of four models are extracted for three different excitation signals, which were selected as a 64-QAM signal around 2.14 GHz with 20 kHz, 30 kHz and 40 kHz bandwidths, ensuring that the thermal memory effects dominate the electrical memory effects. It is shown that the proposed model outperforms all the previously published models for all three excitation signals used in the experiment. © 2013 IEEE.Öğe Wearable textile fabric based 3D metamaterials absorber in X-band(Applied Computational Electromagnetics Society (ACES), 2020) Delihasanlar, E.; Yuzer, A.H.In this paper, a new wearable (flexible) textile fabric-based 3D metamaterials absorber (MMA) structure is proposed. The proposed MMA was created from three layers; weft-knitted fabric, silicone, and plain weave fabric and then, it was simulated in Computer Simulation Technology (CST). It was obtained maximum absorption power (99.66%) at 9.38 GHz, and the average absorption power of 81-95% was obtained in the frequency range of 8 to 12 GHz depending on the incident angle in the simulation. The effect of the wearable textile structure on absorption was investigated. When compared with other materials, it can be said that the proposed MMA is broadband, incident angle independent, TE and TM polarization-independent, flexible, breathable, wearable, ease of fabrication, practical, low weight, and cost advantage. With this designed the textile fabric-based MMA, it can be obtained both low reflection coefficients and low transmission coefficients at broadband X-band frequencies. This provides a good solution for the cloaking of radar systems. © ACESÖğe A wide-band and good gain flatness class AB power amplifier design for mobile communication(Institute of Electrical and Electronics Engineers Inc., 2017) Kaplan, A.; Yuzer, A.H.In this study, Class AB power amplifier was designed for use 3G and 4G mobile communication systems. Agilennt EEsof ADS(Advanced Design System) program was used for the design. BLF621-10G model transistor of NXP company was used as active element and Murata brand of coils and capacitors was used as passive elements. As a result of the design, a power amplifier design and simulation with 200 MHz bandwidth at 2.1 GHz was realized. When the designed power amplifier is exited with 17.5 dBm input power, a stable and good gain flatness(±0.36dBm swing in the 20dB dynamic range) was obtained by obtaining 38 dBm oputput power. © 2017 IEEE.
