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RISS 인기검색어
- 검색키워드
- 저자 : Serhat İkizoğlu (검색결과 2 건)
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Batuhan Günaydın,Serhat İkizoğlu 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.4
The vestibular system (VS) is a sensory system that has a vital function in human life by serving to maintain balance. In thisstudy, multifractal detrended fluctuation analysis (MFDFA) is applied to insole pressure sensor data collected from subjectsin order to extract features to identify diseases related to VS dysfunction. We use the multifractal spectrum width as thefeature to distinguish between healthy and diseased people. It is observed that multifractal behavior is more dominant andthus the spectrum is wider for healthy subjects, where we explain the reason as the long-range correlations of the small andlarge fluctuations of the time series for this group. We directly process the instantaneous pressure values to extract featuresin contrast to studies in the literature where gait analysis is based on investigation of gait dynamics (stride time, stance time,etc.) requiring long walking time. Thus, as the main innovation of this work, we detrend the data to give meaningful informationeven for a relatively short walk. Extracted feature set was input to fundamental classification algorithms where theSupport-Vector-Machine (SVM) performed best with an average accuracy of 98.2% for the binary classification as healthy orsuffering. This study is a substantial part of a big project where we finally aim to identify the specific VS disease that causesbalance disorder and also determine the stage of the disease, if any. Within this scope, the achieved performance gives highmotivation to work more deeply on the issue.
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İlkcan Coşkun,Serhat İkizoğlu 한국전자파학회 2023 Journal of Electromagnetic Engineering and Science Vol.23 No.4
Today, a number of engineering issues require electromagnetic compatibility (EMC) tests, in turn triggering the need for EMC-antenna calibrations. In this framework, experimenters seek accurate and time-saving solutions. Basically, standard site method (SSM) ANSI C63.5-2006 stipulates the near-to-ideal conditions on an empty and vast land, where three antennas are used for antenna factor determination. In our previous work, we investigated the suitability of narrow test sites for antenna calibration according to three-antenna SSM-ANSI- C63.5-2006, whose usability was validated under certain conditions. In the present study, we expand our research by applying the sub-cases of using a known antenna and identical antennas specified in the standard in order to shorten the calibration process. The results reveal that the methods for various calibrations are useful for successfully running the process even in non-ideal sites and help significantly reduce the experimentation time, considering the uncertainty limits specified in EMC test standards.
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