Kurum Yazarı "Gerek, Ömer Nezih" Scopus İndeksli Yayınlar Koleksiyonu İçin Listeleme
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Covariance analysis of voltage waveform signature for power-quality event classification
Gerek, Ömer Nezih; Ece, Doğan Gökhan; Barkana, Atalay (IEEE-Inst Electrical Electronics Engineers Inc, 2006)In this paper, covariance behavior of several features (signature identifiers) that are determined from the voltage waveform within a time window for power-quality (PQ) event detection and classification is analyzed. A ... -
Çevresel Aykırılığa Dayalı Bir Hedef Tespit Algoritması
Automatic target detection algorithms enable in military and civilian applications the detection of low-contrast and spatially small targets that can not be detected by a human operator and remove the requirement of permanent ... -
Detection of disturbances in energy system signals using gaussian distribution fitness test [Enerji Sisitemi Sinyallerinde Bozucularin Gauss Dagilim Uyumlulugu Testi ile Tespiti]
Gerek, Ömer Nezih; Ece, D. G. (2004)In this work, a method based on higher order statistics (HOS) is proposed to detect disturbances in energy system voltage and current waveforms due to faults and various system events. During the normal operation of the ... -
Detection of Voltage Flicker and Voltage Harmonic Using Hilbert Huang Transform
Önal, Yasemin; Gerek, Ömer Nezih; Ece, Doğan Gökhan (IEEE, 2014)Hilbert Huang Transform, which was suggested by Huang and improved by Flandrin and his group, is a new signal processing method. The analysis of nonlinear and non stationary signals can use HHT. This paper deals with the ... -
An Edge-Sensing Predictor in Wavelet Lifting Structures for Lossless Image Coding
Gerek, Ömer Nezih; Çetin, A. Enis (Springer, 2007)The introduction of lifting implementations for image wavelet decomposition generated possibilities of several applications and several adaptive decomposition variations. The prediction step of a lifting stage constitutes ... -
Editorial for Special Issue on Reproducible Research
Gerek, Ömer Nezih; Boashash, Boualem; Leszczuk, Mikolaj; Tsaftaris, Sotirios A.; Armour, Wes; Wallom, David (Academic Press Inc Elsevier Science, 2018)… -
The Effect of Markov Chain State Size for Synthetic Wind Speed Generation
Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih; Kurban, Mehmet (IEEE, 2008)In this study hourly wind speed time series data of Eskisehir region, Turkey have been used for stochastic generation of wind speed data using the transition matrix approach of the Markov chain process. Previous work on ... -
The effect of model generated solar radiation data usage in hybrid (wind-PV) sizing studies
Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih; Kurban, Mehmet (Pergamon-Elsevier Science LTD, 2009)Wind speed and solar radiation characteristics belonging to past years of a region are the main input parameters in wind-photovoltaic hybrid system (WPHS) sizing studies. Classically, these data are fed to several scenarios ... -
Effects of temperature and pressure information in a hybrid (fourier series / neural networks) solar radiation model
Solar radiation modeling is a critical step in efficient management of solar energy. In this study, a novel solar radiation modeling procedure is developed with the a-priori information of temperature and pressure values, ... -
Empirical mode decomposition application for short-term flicker severity
Önal, Yasemin; Gerek, Ömer Nezih; Ece, Doğan Gökhan (Tubitak Scientific & Technical Research Council Turkey, 2016)In this article, an approach based on empirical mode decomposition (EMD) is suggested in order to calculate short-term flicker severity, Pst, in power systems. EMD is a new signal processing method used for the analysis ... -
An eye-glasses-like wearable eye gaze tracking system [Gözlük tabanli bir göz hareket takip sistemi]
Topal, Cihan; Doğan, Atakan; Gerek, Ömer Nezih (2008)In this study, a new eye tracking system that works by wearing an eye-glasses-like apparatus with attached sensors, is introduced. Due to the working principle of the system, the device is called the Eye Touch system. The ... -
A fast method for the implementation of common vector approach
Koç, Mehmet; Barkana, Atalay; Gerek, Ömer Nezih (Elsevier Science Inc, 2010)In this paper a novel computation method is proposed to perform the common vector approach (CVA) faster than its conventional implementation in pattern recognition. While conventional CVA calculations perform the classification ... -
Feature extraction, selection and classification code for power line scene recognition
Yetgin, Ömer Emre; Gerek, Ömer Nezih (Elsevier Science BV, 2018)Detection and avoiding of power lines and cables is a critical issue in aircraft flight safety. Despite various improvements in image analysis literature, most of the safety issues depend on visual capabilities of pilots. ... -
Feature selection for power quality event classification [Güç kalitesi olaylarinin siniflandirilmasi için öznitelik seçimi]
Günal, Serkan; Edizkan, R.; Gerek, Ömer Nezih; Ece, D. G. (2008)Power quality events may result in interruption or malfunctioning of electrical equipments that are fed through the voltage line. Detection of such cases by monitoring the voltage waveform remains an important engineering ... -
GERİLİM KIRPIŞMASININ HILBERT-HUANG DÖNÜŞÜMÜ İLE ANALİZİ
Önal, Yasemin; Ece, D. G.; Gerek, Ömer Nezih (2011)Hilbert Huang Dönüşümü (HHT) Huang tarafından önerilen, Flandrin ve ekibi tarafından geliştirilen lineer ve durağan olmayan sinyallerin analizinde kullanılan yeni bir sinyal işleme yöntemidir. Bu çalışmada, güç ... -
Harmonic analysis based hourly solar radiation forecasting model
Fidan, Mehmet; Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih (Inst Engineering Technology-Iet, 2015)In this study, a novel two-step hourly solar radiation modelling procedure is developed. In the first step, hourly solar radiation data of a single day is considered and its periodic Fourier series coefficients are calculated. ... -
A Head-Mounted Sensor-Based Eye Tracking Device: Eye Touch System
Topal, Cihan; Gerek, Ömer Nezih; Doğan, Atakan (Assoc Computing Machinery, 2008)In this study, a new eye tracking system, namely Eye Touch, is introduced. Eye Touch is based on an eyeglasses-like apparatus on which IrDA sensitive sensors and IrDA light sources are mounted. Using inexpensive sensors ... -
Hilbert-Huang Transform Based Approach for Measurement of Voltage Flicker Magnitude and Frequency
Önal, Yasemin; Ece, Doğan Gökhan; Gerek, Ömer Nezih (Taylor & Francis Inc, 2015)Voltage flicker is a non-stationary waveform for which direct spectral analysis is not appropriate. To overcome this difficulty, a Hilbert-Huang transform based technique is proposed here. Hilbert-Huang transform is a new ... -
Hourly Forecasting of Long Term Electric Energy Demand Using Novel Mathematical Models and Neural Networks
Başaran Filik, Ümmühan; Gerek, Ömer Nezih; Kurban, Mehmet (Icic Int, 2011)In this work, hourly forecasting of long term electric energy demand is achieved using mathematical models and Artificial Neural Network (ANN) approaches. Previous works regarding energy demand forecasting either treated ... -
Hourly solar radiation forecasting using optimal coefficient 2-D linear filters and feed-forward neural networks
Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih; Kurban, Mehmet (Pergamon-Elsevier Science LTD, 2008)In this work, the hourly solar radiation data collected during the period August 1, 2005-July 30, 2006 from the solar observation station in Iki Eylul campus area of Eskisehir region are studied. A two-dimensional (2-D) ...