Yazar "Gerek, Ömer Nezih" için Makale Koleksiyonu listeleme
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Induction machine condition monitoring using notch-filtered motor current
Günal, Serkan; Ece, Doğan Gökhan; Gerek, Ömer Nezih (Academic Press LTD- Elsevier Science LTD, 2009)This paper presents a new approach to induction motor condition monitoring using notch-filtered motor current signature analysis (NFMCSA). Unlike most of the previous work utilizing motor current signature analysis (MCSA) ... -
Mycielski approach for wind speed prediction
Hocaoğlu, Fatih Onur; Fidan, Mehmet; Gerek, Ömer Nezih (Pergamon-Elsevier Science LTD, 2009)Wind speed modeling and prediction plays a critical role in wind related engineering studies. However, since the data have random behavior, it is difficult to apply statistical approaches with apriori and deterministic ... -
Neural and mathematical modeling approaches for hourly long term loadforecasting
In this work, a mathematical model and an Artificial Neural Network (ANN)approach are constructed for the hourly forecasting of long term electric energydemand. Unlike former studies, these methods produce long term load ... -
A new implementation of common matrix approach using third-order tensors for face recognition
Ergin, Semih; Çakır, Serdar; Gerek, Ömer Nezih; Gülmezoğlu, M. Bilginer (Pergamon-Elsevier Science LTD, 2011)In the classical common matrix approach (CMA), the common matrix for each individual face class is obtained using basis matrices calculated by Gram-Schmidt orthogonalization of the class covariance matrix. This common ... -
A novel fourier based solar radiation model
Solar radiation modeling is an important issue for renewable energyengineering based problems. In this study, a novel solar radiation model isproposed. The model inputs are the solar radiation data belonging to first ... -
A novel hybrid (wind-photovoltaic) system sizing procedure
Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih; Kurban, Mehmet (Pergamon-Elsevier Science LTD, 2009)Wind-photovoltaic hybrid system (WPHS) utilization is becoming popular due to increasing energy costs and decreasing prices of turbines and photovoltaic (PV) panels. However, prior to construction of a renewable generation ... -
A novel modeling approach for hourly forecasting of long-term electric energy demand
Başaran Filik, Ümmühan; Gerek, Ömer Nezih; Kurban, Mehmet (Pergamon-Elsevier Science LTD, 2011)In this study, a novel mathematical method is proposed for modeling and forecasting electric energy demand. The method is capable of making long-term forecasts. However, unlike other long-term forecasting models, the ... -
Novel Models for Hourly Solar Radiation Using a 2-D Approach
Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih; Kurban, Mehmet (Icic Int, 2009)In this work one year hourly solar radiation data are analyzed and modeled using a novel visualization method. Using a 2-D(Dimensional) surface fitting approach, the general behavior of the solar radiation in a year is ... -
A novel wind speed modeling approach using atmospheric pressure observations and hidden Markov models
Hocaoğlu, Fatih Onur; Gerek, Ömer Nezih; Kurban, Mehmet (Elsevier Science BV, 2010)Modeling the wind speed data has important implications in wind studies, providing valuable insight and parametric quantities for further engineering analysis. The classical modeling approach is to fit the probability ... -
On the realization of common matrix classifier using covariance tensors
Ergin, Semih; Gerek, Ömer Nezih; Gülmezoğlu, M. Bilginer; Barkana, Atalay (Academic Press Inc Elsevier Science, 2015)Due to the growing interest in image classifiers, the concept of native two dimensional (2-D) classifiers continues to attract researchers in the field of pattern recognition. In most cases, the 2-D extension of a regular ... -
A power quality analysis scheme using adaptive subband decomposition
Ece, Doğan Gökhan; Gerek, Ömer Nezih (Wiley, 2009)In this work, a new event detection method for power quality analysis based on the statistical analysis of adaptive decomposition signals is presented. The combination of an adaptive prediction filter-based subband ... -
Power-quality event analysis using higher order cumulants and quadratic classifiers
Gerek, Ömer Nezih; Ece, Dugan Gökhan (IEEE-Inst Electrical Electronics Engineers Inc, 2006)In this paper, we present a novel power-quality (PQ) event detection and classification method using higher order cumulants as the feature parameter, and quadratic classifiers as the classification method. We have observed ... -
Salient point region covariance descriptor for target tracking
Çakır, Serdar; Aytaç, Tayfun; Yıldırım, Alper; Beheshti, Soosan; Gerek, Ömer Nezih; Çetin, A. Enis (Spie-Soc Photo-Optical Instrumentation Engineers, 2013)Features extracted at salient points are used to construct a region covariance descriptor (RCD) for target tracking. In the classical approach, the RCD is computed by using the features at each pixel location, which increases ... -
Segmentation based coding of human face images for retrieval
Gerek, Ömer Nezih; Çınar, H (Elsevier Science BV, 2004)A coding method for face images by segmenting face regions Such as eyes, mouth, etc. is introduced. Each region is removed from the face image, leaving a smoothly interpolated background which is suitable for efficient ... -
A subspace based progressive coding method for speech compression
Keser, Serkan; Gerek, Ömer Nezih; Seke, Erol; Gillmezoğlu, Mehmet Bilginer (Elsevier Science BV, 2017)In this study, two novel methods, which are based on Karhunen Loeve Transform (KLT) and Independent Component Analysis (ICA), are proposed for coding of speech signals. Instead of immediately dealing with eigenvalue ...