Sevda GUl

Work place: Electrical-Electronics Engineering, Sakarya University, Esentepe, Sakarya 54187, Turkey



Research Interests: Image Processing, Image Manipulation, Image Compression, Computational Learning Theory, Computer systems and computational processes


Sevda GÜL was born in Istanbul, Turkey. She received her Electronics Teacher and Electronics Engineering Degrees at Sakarya University, Turkey in 2012 and in 2016, respectively. Currently, she is a master student in Electrical and Electronics Engineering, at Sakarya University, Turkey. Her research areas include machine learning, signal and image processing.

Author Articles
Breast Lesion Segmentation and Area Calculation for MR Images

By Gokcen Cetinel Sevda GUl

DOI:, Pub. Date: 8 Oct. 2018

In this paper, our goal is to determine the boundaries of lesion and then calculate the area of existing lesion in breast magnetic resonance (MR) images to provide a useful information to the radiologists. For this purpose, at first stage region growing (RG) method and active contour model (Snake) is applied to the images to make the boundaries of lesion visible.  
RG method is one of the simplest approaches for image segmentation and provides accurate results with lower computation time due to its seed point initialization step. Snake method molds a closed contour to the boundary of a region in an image and is also popular in medical image segmentation studies. In the presented study, both of these methods are utilized to determine the lesion boundaries. 
After determining the boundaries of lesion accurately in the second stage of the study, bit-quad method is applied to the segmented images. Bit quad method is used to compute the area and perimeter of binary lesion images based on matching the logical state of regions of image to binary patterns. Finally, to evaluate the performance of the proposed study, computer simulations are performed. It is demonstrated via computer simulations that the lesion area and parameter values are very close to real values. By means of this study it is aimed to support radiologists during diagnosis and assessment of breast lesions.

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Automated Pre-Seizure Detection for Epileptic Patients Using Machine Learning Methods

By Sevda GUl Muhammed K. UCAR Gokcen Cetinel Erhan BERGIL Mehmet R. BOZKURT

DOI:, Pub. Date: 8 Jul. 2017

Epilepsy is a neurological disorder resulting from unusual electrochemical discharge of nerve cells in the brain, and EEG (Electroencephalography) signals are commonly used today to diagnose the disorder that occurs in these signals. In this study, it was aimed to use EEG signals to automatically detect pre-epileptic seizure with machine learning techniques. EEG data from two epileptic patients were used in the study. EEG data is passed through the preprocessing stage and then subjected to feature extraction in time and frequency domain. In the feature extraction step 26 features are obtain to determine the seizure time. When the feature vector is analyzed, it is observed that the characteristics of the pre-seizure and non-seizure period are unevenly distributed. A systematic sampling method has been applied for this imbalance. For the balanced data, two test sets with and without Eta correlation are established. Finally, the classification process is performed using the k-Nearest Neighbor classification method. The obtained data are evaluated in terms of Eta-correlated and uncorrelated accuracy, error rate, precision, sensitivity and F-criterion for each channel. 

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