Yazar "Cengiz, Caner" seçeneğine göre listele

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    Öğe
    A New Waveform Design based on Sequentially Connected ILWT and FWHT Transforms
    (Institute of Electrical and Electronics Engineers Inc., 2020) Cengiz, Caner; Bilbay, Ozcan; Akilli, Ahmet Halit; Sert, Serhat; Özen, Ali
    In this study, zero tail inverse Lifting wavelet transform spread fast Walsh Hadamard transformed OFDM (ZT-ILWTs FWHT OFDM) is recommended as an alternative to the OFDM waveform for the new generation of wireless transmission systems. The recommended waveform is composed of a combination of inverse Lifting wavelet transform (ILWT) and fast Walsh Hadamard transform (FWHT) with OFDM waveform. The proposed waveform is tested with computer simulation studies for bit error rate (BER), peak to average power ratio (PAPR) and out of band emission (OOBE) performance criteria. From the attained results, it is observed that the recommended waveform is better than classical OFDM and zero-tail discrete Fourier transform spread OFDM (ZT-DFT-S OFDM) waveforms for all three performance criteria. © 2020 IEEE.
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    Öğe
    Huzurevinde kalan yaşlılarda düşme korkusu ve ilişkili faktörler
    (Türk Fizyoterapi ve Rehabilitasyon Dergisi, 2015) Soyuer, Ferhan; Cankurtaran, Feyzan; Sert, Serhat; Akıllı, Ahmet Halit; Bilbay, Özcan; Cengiz, Caner
    This study was designed to determine fear of falling and its related variables in elderly people living in rest home.85 elderly people staying at Hacı Rukiye Gazioğlu Rest Home are included. Elderly people, are evaluated by mental state; Standardized Mini Mental Test , balance; Berg Balance Scala, mobility; Time up and go test, depression; Geriatric Depression Scale, daily of living activities; Katz’s Daily ofLiving Activities Index, fear of fall; Tinetti’s effect scale of fall and visualanalog scale.38 elderly people are (44.7%) female, 47 are male ( 55.3%). Age average is 77.36±8,68 (65-98). Due to VAS evaluation 61 of elderly people (71.8%) are effected by fear of fall. There was a statistically significant correlations only between Tinetti’s effect scale of fall and visualanalog scale and age, Katz’s Daily of Living Activities Index, Geriatric Depression Scale, Berg Balance Scala, Time up and go test (p<0,05, p<0,001). There was a statistically significant difference in Tinetti’s effect scale of fall and visualanalog scale scores between female and male, use of help equipment and not use of help equipment (p<0,01). There was a statistically significant difference in Tinetti’s effect scale of fall scores between the groups of depression and non-depression (p<0,05).Fear of fall is a very important health issue in elderly people living in rest homes. There are lots of factors detected to be in relation with fear of fall like age, gender, use of help equipment, daily of living activities, balance, mobility and depression. In order to make elderly people live like active people program for preventing fear of fall and limiting activities improving physical activities like balance and mobility and improving depression programs should be used. Huzurevinde yaşayan yaşlılarda, düşme korkusunu ve ilişkili olabilecek değişkenleri belirlemek amacıyla bu çalışma planlanmıştır.Çalışmaya Hacı Rukiye Gazioğlu Huzurevi’nde kayıtlı, alınma kriterlerine uyan 85 yaşlı dahil edilmiştir. Yaşlılar; mental durum, Standardize Mini Mental Test (SMMT), denge, Berg Denge Skalası (BDÖ), mobilite, Süreli Kalk ve Yürü Testi (SKYT), depresyon, Geriatrik Depresyon Ölçeği (GDÖ), günlük yaşam aktivitesi, Katz’in Günlük Yaşam Aktiviteleri İndeksi (GYA), düşme korkusu, Tinetti’ nin Düşmenin Etkisi Ölçeği (TDEÖ) ve Görsel Analog Skala (GAS) kullanılarak değerlendirilmiştir.Çalışmaya katılan yaşlıların 38 (%44,7)’si kadın, 47 (%55,3)’ü erkektir. Yaş ortalamaları 76,36±8,68 (65-98) yıldır. GAS değerlendirmesine göre, yaşlıların 61 (%71,8)’inin düşme korkusu yaşadığı tespit edilmiştir. TDEÖve GAS’la, yaş, Katz GYA, GDÖ, BDÖ veSKYT arasında istatistiksel olarak anlamlı bir ilişki tespit edilmiştir (p<0,05, p<0,001). TDEÖ ve GAS değerleri, kadın ve erkekler arasında ve yardımcı cihaz kullanan ve kullanmayanlar arasında istatistiksel olarak anlamlı fark göstermiştir (p<0,01). TDEÖ değerleri, depresyonu olan ve olmayan yaşlılar arasında, istatistiksel olarak anlamlı fark göstermiştir (p<0,05).Huzurevinde yaşayan yaşlılarda düşme korkusu önemli bir sağlık problemidir. Düşme korkusu ile ilişkili olduğu tespit edilmiş, yaş, cinsiyet, yardımcı cihaz kullanımı, günlük yaşam aktivitesi, denge, mobilite, depresyon gibi birçok faktör vardır. Yaşlıların, aktif bireyler olarak yaşamalarını sağlamak için, düşme korkusu ve aktivite kısıtlanmasını önleyici programlarla, denge ve mobilite gibi fiziksel becerilerini geliştirici, depresyonu iyileştiren girişimler sağlanmalıdır.
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    Öğe
    Improving the Performance of Flip OFDM Systems for Visible Light Communication Systems
    (Institute of Electrical and Electronics Engineers Inc., 2020) Bilbay, Ozcan; Cengiz, Caner; Akilli, Ahmet Halit; Sert, Serhat; Özen, Ali
    Optical wireless communication technology is one of the most important alternative schemes for radio frequency communication. Flip orthogonal frequency division multiplexing OFDM (Flip-OFDM) is a type of indoor optical wireless communication that transmits the positive and the absolute values of negative parts of the signal in two successive OFDM symbols. In this paper, the Fast Walsh Hadamard Transform (FWHT) based Flip-OFDM method (FWHT Flip-OFDM) is proposed to improve the performance of the Flip-OFDM system. Computer simulation studies are performed to test the performance of the proposed method over the bit error rate (BER) and peak to average power ratio (PAPR) performance criteria. From the obtained simulation results, it is observed that the proposed method is better than both VLC-OFDM and Flip-OFDM methods for both performance metrics. © 2020 IEEE.
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    Öğe
    Improving the Performance of Optical Single Carrier Frequency Domain Channel Equalizer for Visible Light Communications
    (Institute of Electrical and Electronics Engineers Inc., 2020) Sert, Serhat; Akilli, Ahmet Halit; Bilbay, Ozcan; Cengiz, Caner; Özen, Ali
    In this study, it is recommended to use Turbo channel coding (TC) technique to increase the performance of optical single carrier frequency domain channel equalizer (OSCFDCE) used to repair the data that is distorted in multipath optical channel environment of single carrier (SC) visible light communication (VLC) systems. Computer simulations are performed to verify the performance of the proposed Turbocoded OSC-FDCE method in the 5, 6, and 10 taps multipath optical channel environment based on the bit error rate (BER) performance criterion. From the obtained simulation results, it is seen that the error base of the OSC-FDCE method is eliminated with TC OSC-FDCE method and has a better performance than TC VLC orthogonal frequency division multiplexing (OFDM) frequency domain equalizer (FDE) method (TC VLC-OFDM-FDE). © 2020 IEEE.