Nazlıbilek, Sedat

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Nazlıbilek, Sedat

Name Variants

S.,Nazlibilek
N., Sedat
Nazlıbilek,S.
Sedat, Nazlıbilek
N.,Sedat
Nazlibilek,S.
S., Nazlibilek
S.,Nazlıbilek
Sedat, Nazlibilek
Nazlıbilek, Sedat
Nazlibilek, Sedat

Job Title

Doçent Doktor

Main Affiliation

Department of Mechatronics Engineering

Status

Former Staff

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Scholarly Output

19

Articles

14

Citation Count

211

Supervised Theses

3 Scholarly Output Search Results

Now showing 1 - 10 of 19

Citation - WoS: 21
Citation - Scopus: 26
Discrete Lissajous Figures and Applications
(Ieee-inst Electrical Electronics Engineers inc, 2014) Karacor, Deniz; Nazlibilek, Sedat; Sazli, Murat H.; Akarsu, Eyup S.; Department of Mechatronics Engineering
In this paper, an innovative method based on an algorithm utilizing discrete convolutions of discrete-time functions is developed to obtain and represent discrete Lissajous and recton functions. They are actually discrete auto- and cross-correlation functions. The theory of discrete Lissajous figures is developed. The concept of rectons is introduced. The relation between the discrete Lissajous figures and autocorrelation functions is set. Some applications are described including phase, frequency, and period determination of periodic signals, time-domain characteristics (such as damping ratio) of a control system, and abnormality and spike detection within a signal, are described. In addition, an electrocardiogram signal with an abnormality of atrial fibrillation is given for abnormality detection by means of recton functions. An epileptic activity detection within an electroencephalography signal is also given.
Citation - WoS: 10
Citation - Scopus: 12
Anomaly Detection With Low Magnetic Flux: a Fluxgate Sensor Network Application
(Elsevier Sci Ltd, 2016) Ege, Yavuz; Coramik, Mustafa; Kabadayi, Murat; Citak, Hakan; Kalender, Osman; Yuruklu, Emrah; Nazlibilek, Sedat; Department of Mechatronics Engineering
Recent studies on remote detection methods were mostly for improving variables like sensing distance, sensitivity and power consumption. Especially using anisotropic magneto-resistive sensors with low power consumption and high sensitivity for detecting subsurface magnetic materials became very popular in last decades. In our study, for detecting subsurface materials, we have used fluxgate sensor network for having even higher sensitivity and also minimizing the power consumption by detecting the changing rates of horizontal component of earth's magnetic flux which is assumed to be very low. We have constituted a magnetic measurement system which comprises a detector system, which has a mechanism enables sensors to move in 3-D space, a data acquisition module for processing and sending all sensor information, and a computer for running the magnetic flux data evaluation and recording software. Using this system, tests are carried out to detect anomalies on horizontal component of earth's magnetic flux which is created by different subsurface materials with known magnetic, chemical and geometric properties. The harmonics of horizontal component of earth's magnetic flux in scanned area are analyzed by the help of DSP Lock-In amplifier and the amplitudes of high variation harmonics are shown as computer graphics. Using the graphic information, the upside surface geometry of subsurface material is defined. For identifying the magnetic anomalies, we have used the scale-invariant feature transform (SIFT)-binary robust invariant scalable keypoints (BRISKs) as keypoint and descriptor. We used an algorithm for matching the newly scanned image to the closest image in database which is constituted of mines and possible other metal objects like cans, etc. Results show that, if the proposed detection system is used instead of metal detectors which cannot distinguish mines from other metal materials and alert for every type of metal with different geometries, it can be said that miss alarm count, work force and time can be decreased dramatically. In this paper, mostly the setup of the system is described and in Appendix A some experimental outputs of the system for different geometries of metal samples are given. And also for comparing the results of the proposed system, additional experiments are carried out with a different type of sensor chip, namely KMZ51, and also given in Appendix A. (C) 2015 Elsevier Ltd. All rights reserved.
Citation - WoS: 1
Citation - Scopus: 1
Autonomous Multiple Teams Establishment for Mobile Sensor Networks by Svms Within a Potential Field
(Elsevier Sci Ltd, 2012) Nazlibilek, Sedat; Department of Mechatronics Engineering
In this work, a new method and algorithm for autonomous teams establishment with mobile sensor network units by SVMs based on task allocations within a potential field is proposed. The sensor network deployed into the environment using the algorithm is composed of robot units with sensing capability of magnetic anomaly of the earth. A new algorithm is developed for task assignment. It is based on the optimization of weights between robots and tasks. The weights are composed of skill ratings of the robots and priorities of the tasks. Multiple teams of mobile units are established in a local area based on these mission vectors. A mission vector is the genetic and gained background information of the mobile units. The genetic background is the inherent structure of their knowledge base in a vector form but it can be dynamically updated with the information gained later on by experience. The mission is performed in a magnetic anomaly environment. The initial values of the mission vectors are loaded by the task assignment algorithm. The mission vectors are updated at the beginning of each sampling period of the motion. Then the teams of robots are created by the support vector machines. A linear optimal hyperplane is calculated by the use of SVM algorithm during training period. Then the robots are classified as teams by use of SVM mechanism embedded in the robots. The support vector machines are implemented in the robots by ordinary op-amps and basic logical gates. Team establishment is tested by simulations and a practical test-bed. Both simulations and the actual operation of the system prove that the system functions satisfactorily. (C) 2012 Elsevier Ltd. All rights reserved.
Citation - WoS: 2
Citation - Scopus: 2
Optimization of Parameters Acting on a Projectile Velocity Within a Four Stage Induction Coil-Gun
(Elsevier Sci Ltd, 2010) Coskun, Ismail; Kalender, Osman; Ege, Yavuz; Nazlibilek, Sedat; Department of Mechatronics Engineering
In this work, a four stage induction coil-gun has been designed and the parameters acting on the bullet velocity has been investigated. The mutual inductance variation depending on the bullet coil position, determination of firing point exposed to the maximum force with respect to the length, and appropriate material selection for the bullet coil have been analyzed. Optimum solutions for these parameters have been presented. (C) 2010 Elsevier Ltd. All rights reserved.
Citation - WoS: 8
Citation - Scopus: 13
White Blood Cells Classifications by SURF Image Matching, PCA and Dendrogram
(Allied Acad, 2015) Nazlibilek, Sedat; Karacor, Deniz; Erturk, Korhan Levent; Sengul, Gokhan; Ercan, Tuncay; Aliew, Fuad; Department of Mechatronics Engineering; Information Systems Engineering; Computer Engineering; Department of Mechatronics Engineering; Information Systems Engineering; Computer Engineering
Determination and classification of white blood cells are very important for diagnosing many diseases. The number of white blood cells and morphological changes or blasts of them provide valuable information for the positive results of the diseases such as Acute Lymphocytic Leucomia (ALL). Recognition and classification of white cells as basophils, lymphocytes, neutrophils, monocytes and eosinophils also give additional information for the diagnosis of many diseases. We are developing an automatic process for counting, size determination and classification of white blood cells. In this paper, we give the results of the classification process for which we experienced a study with hundreds of images of white blood cells. This process will help to diagnose especially ALL disease in a fast and automatic way. Three methods are used for classification of five types of white blood cells. The first one is a new algorithm utilizing image matching for classification that is called the Speed-Up Robust Feature detector (SURF). The second one is the PCA that gives the advantage of dimension reduction. The third is the classification tree called dendrogram following the PCA. Satisfactory results are obtained by two techniques.
Citation - Scopus: 0
Attitude Control of Cubesat in Single Axis by Fuzzy Logic Controller
(Avestia Publishing, 2017) Nazlibilek,S.; Kilickaya,O.G.; Tanyer,S.G.; Department of Mechatronics Engineering
Over the last two decades, satellites are getting smaller with increasing capabilities for space research. Small satellites (between 1 and 15 kg) show great promise as a low-cost option both in production and launching. In this work, attitude control problem for a cubesat is examined. A physical testbed is designed for simulation and testing in a single axis. Cubesat reaction wheel and the testbed are integrated, and fuzzy logic control software in Arduino Mega microprocessor environment is developed. The cubesat floor at the same axis of reaction wheel is tested and real-time measurement data are obtained. Step response and ramp response behaviours are analysed. © 2016 Avestia Publishing.
Tepki Tekeri Uygulaması, Tasarımı ve Performans Analizi
(2019) Özer, Ulus Töre; Nazlıbilek, Sedat; Department of Mechatronics Engineering
Bu tezin amacı bir Tepki Tekeri tasarlamaktır. Bir tepki tekeri, belirlenmiş sabit noktalara göre yönlendirme sağlayan uydu sistemleri içindeki bir operatördür. Bu nedenle tez, küp uydularda kullanılabilecek tek eksenli bir reaksiyon tekerleğinin tasarımını ve geliştirilmesini göstermektedir.
Citation - WoS: 116
Citation - Scopus: 148
Automatic Segmentation, Counting, Size Determination and Classification of White Blood Cells
(Elsevier Sci Ltd, 2014) Nazlibilek, Sedat; Karacor, Deniz; Ercan, Tuncay; Sazli, Murat Husnu; Kalender, Osman; Ege, Yavuz; Department of Mechatronics Engineering
The counts, the so-called differential counts, and sizes of different types of white blood cells provide invaluable information to evaluate a wide range of important hematic pathologies from infections to leukemia. Today, the diagnosis of diseases can still be achieved mainly by manual techniques. However, this traditional method is very tedious and time-consuming. The accuracy of it depends on the operator's expertise. There are laser based cytometers used in laboratories. These advanced devices are costly and requires accurate hardware calibration. They also use actual blood samples. Thus there is always a need for a cost effective and robust automated system. The proposed system in this paper automatically counts the white blood cells, determine their sizes accurately and classifies them into five types such as basophil, lymphocyte, neutrophil, monocyte and eosinophil. The aim of the system is to help for diagnosing diseases. In our work, a new and completely automatic counting, segmentation and classification process is developed. The outputs of the system are the number of white blood cells, their sizes and types. (C) 2014 Elsevier Ltd. All rights reserved.
Citation - WoS: 19
Citation - Scopus: 19
Identification of Materials With Magnetic Characteristics by Neural Networks
(Elsevier Sci Ltd, 2012) Nazlibilek, Sedat; Ege, Yavuz; Kalender, Osman; Sensoy, Mehmet Gokhan; Karacor, Deniz; Sazh, Murat Husnu; Department of Mechatronics Engineering
In industry, there is a need for remote sensing and autonomous method for the identification of the ferromagnetic materials used. The system is desired to have the characteristics of improved accuracy and low power consumption. It must also autonomous and fast enough for the decision. In this work, the details of inaccurate and low power remote sensing mechanism and autonomous identification system are given. The remote sensing mechanism utilizes KMZ51 anisotropic magneto-resistive sensor with high sensitivity and low power consumption. The images and most appropriate mathematical curves and formulas for the magnetic anomalies created by the magnetic materials are obtained by 2-D motion of the sensor over the material. The contribution of the paper is the use of the images obtained by the measurement of the perpendicular component of the Earth magnetic field that is a new method for the purpose of identification of an unknown magnetic material. The identification system is based on two kinds of neural network structures. The MultiLayer Perceptron (MLP) and the Radial Basis Function (RBF) network types are used for training of the neural networks. In this work, 23 different materials such as SAE/AISI 1030, 1035, 1040, 1060, 4140 and 8260 are identified. Besides the ferromagnetic materials, three objects are also successfully identified. Two of them are anti-personal and anti-tank mines and one is an empty can box. It is shown that the identification system can also be used as a buried mine identification system. The neural networks are trained with images which are originally obtained by the remote sensing system and the system is operated by images with added Gaussian white noises. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
Optik Teleskoplar için İki Serbestlik Dereceli Çatal Kurgu Tasarımı
(2015) Yıldıran, Yaşar; Nazlıbilek, Sedat; Department of Mechatronics Engineering
Bu tez ile optik teleskoplar için iki serbestlik derecesinde hareket mekanizmasına sahip çatal kollu teleskop montürünün elektronik, mekanik ve yazılımsal tasarımının ve prototipinin yapılması amaçlanmıştır. Teleskop montürü küçük sınıf teleskoplar için tasarlanmış ve prototiplenmiştir. Protatiplenen teleskop montürü; 35 kg ağırlığındaki optik teleskopları yönlendirebilecek kapasitededir. Teleskop montürünün çatal kolları arasındaki mesafe; 20 cm ile 40 cm ayna çapına sahip optik teleskopların takılmasına imkan verecek niteliktedir. Sistem mekanik gereksinimleri tespit edilmiş buna uygun mekanik tasarım yapılmıştır. Hareketi sağlayacak eyleyiciler ve sistem kontrolü için gerekli elektronik altyapı temin edilmiştir. Sistemin kontrolü Simulink'te oluşturulmuş iki katmanlı blok model ile yapılmaktadır. Simulink harici modda ana kartımız olan Arduino Mega üzerinden eyleyicilerin kontrolüne imkan vermektedir. Sistemin kapalı devre kontrolü iyi bilinen PID kontrolcü ile yapılmıştır. Yapılan prototipin hedefleme ve takip kabiliyeti test edilmiş, elde edilen test sonuçları değerlendirilmiştir. Anahtar Kelimeler: Teleskop Kurgusu, Teleskop Montürü, Alt-Az Teleskoplar, Teleskop kontrol mimarisi, MATLAB – Simulink ile Arduino kart kullanımı

Nazlıbilek, Sedat

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Scholarly Output

19

Articles

14

Citation Count

211

Supervised Theses

3

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