Özbek, Mehmet Efe

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Profile URL
https://hdl.handle.net/20.500.14411/8156
Name Variants
Mehmet Efe, Özbek
Ozbek, Mehmet Efe
M.E.Ozbek
O.,Mehmet Efe
M.,Özbek
Ö.,Mehmet Efe
O., Mehmet Efe
Özbek, Mehmet Efe
Ozbek,M.E.
M.E.Özbek
Mehmet Efe, Ozbek
M., Ozbek
Özbek,M.E.
Efe, MÖ
Efe, MO
Job Title
Doktor Öğretim Üyesi
Email Address
efe.ozbek@atilim.edu.tr
Main Affiliation
Department of Electrical & Electronics Engineering
Status
Former Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID

Sustainable Development Goals

NO POVERTY1
NO POVERTY
0
Research Products
ZERO HUNGER2
ZERO HUNGER
0
Research Products
GOOD HEALTH AND WELL-BEING3
GOOD HEALTH AND WELL-BEING
0
Research Products
QUALITY EDUCATION4
QUALITY EDUCATION
3
Research Products
GENDER EQUALITY5
GENDER EQUALITY
0
Research Products
CLEAN WATER AND SANITATION6
CLEAN WATER AND SANITATION
0
Research Products
AFFORDABLE AND CLEAN ENERGY7
AFFORDABLE AND CLEAN ENERGY
4
Research Products
DECENT WORK AND ECONOMIC GROWTH8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
INDUSTRY, INNOVATION AND INFRASTRUCTURE9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
REDUCED INEQUALITIES10
REDUCED INEQUALITIES
0
Research Products
SUSTAINABLE CITIES AND COMMUNITIES11
SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
RESPONSIBLE CONSUMPTION AND PRODUCTION12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
Research Products
CLIMATE ACTION13
CLIMATE ACTION
1
Research Products
LIFE BELOW WATER14
LIFE BELOW WATER
0
Research Products
LIFE ON LAND15
LIFE ON LAND
0
Research Products
PEACE, JUSTICE AND STRONG INSTITUTIONS16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
PARTNERSHIPS FOR THE GOALS17
PARTNERSHIPS FOR THE GOALS
0
Research Products
This researcher does not have a Scopus ID.
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Scholarly Output

41

Articles

16

Views / Downloads

216/2118

Supervised MSc Theses

13

Supervised PhD Theses

1

WoS Citation Count

120

Scopus Citation Count

192

Patents

0

Projects

0

WoS Citations per Publication

2.93

Scopus Citations per Publication

4.68

Open Access Source

5

Supervised Theses

14

JournalCount
2010 9th International Conference on Information Technology Based Higher Education and Training, ITHET 2010 -- 2010 9th International Conference on Information Technology Based Higher Education and Training, ITHET 2010 -- 29 April 2010 through 1 May 2010 -- Cappadocia -- 809242
Journal of Petroleum Science and Engineering2
Measurement and Control2
Electronic Design1
Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi1
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Scholarly Output Search Results

Now showing 1 - 10 of 16
  • Thumbnail Image
    Article
    Citation - WoS: 40
    Citation - Scopus: 52
    Variable Structure Control of a Class of Uncertain Systems
    (Pergamon-elsevier Science Ltd, 2004) Efe, MÖ; Ünsal, C; Kaynak, O; Yu, XH
    This brief paper proposes a method for tuning the parameters of a variable structure controller. The approach presented extracts the error at the output of the controller and applies a nonlinear tuning law using this error measure. The adaptation mechanism drives the state tracking error vector to the sliding hypersurface and maintains the sliding mode. In the simulations, the approach presented has been tested on the control of Dulling oscillator and the analytical claims have been justified under the existence of measurement noise, uncertainty and large nonzero initial errors. (C) 2003 Elsevier Ltd. All rights reserved.
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    Article
    Piezoelectric Driver Finds Buzzer's Resonant Frequency
    (2008) Ozbek,M.E.
    [No abstract available]
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    Article
    Citation - WoS: 7
    Citation - Scopus: 8
    Robust and Adaptive Control Design of a Drilling Rig During the Operating Modes
    (Sage Publications Ltd, 2019) Sadeghi, Amir Nobahar; Arikan, Kutluk Bilge; Ozbek, Mehmet Efe; Baranoglu, Besim; Nobahar Sadeghi, Amir
    Oil well drilling towers have different operating modes during a real operation, like drilling, tripping, and reaming. Each mode involves certain external disturbances and uncertainties. In this study, using the nonlinear model for the modes of the operation, robust and/or adaptive control systems are designed based on the models. These control strategies include five types of controllers: cascaded proportional-integral-derivative, active disturbance rejection controller, loop shaping, feedback error learning, and sliding mode controller. The study presents the design process of these controllers and evaluates the performances of the proposed control systems to track the reference signal and reject the uncertain forces including the parametric uncertainties and the external disturbances. This comparison is based on the mathematical performance measures and energy consumption. In addition, three architectures are presented to control the weight on bit during drilling process, and also to maintain a preset constant weight on bit, two control approaches are designed and presented.
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    Article
    Citation - WoS: 25
    Citation - Scopus: 34
    Modelling and Controlling of Drill String Stick Slip Vibrations in an Oil Well Drilling Rig
    (Elsevier, 2022) Sadeghi, Amir Noabahar; Arikan, Kutluk Bilge; Ozbek, Mehmet Efe; Noabahar Sadeghi, Amir
    Mitigating of drill string vibrations, plays a distinctive role in increase of rate of penetration and consequently decrease of the operation costs, prevent of severe damages to drill string and bit, increase of drilling operation quality and safety, and enhance the performances of the controllers. This study deals with modelling and controlling of drill string vibrations with focus on stick slip vibrations in vertical wells. The approach taken to subdivide the drill string into smaller torsional sections and model the complete system dynamically and employ the extracted torsional model to model the stick slip vibrations mathematically. To mitigate and or active control of stick slip vibrations, three architectures are developed and proposed, manipulation of the rotational speed, manipulation of the weight on bit, and increasing of the damping in the bottom of the drill string. The performance of each strategy is analysed individually as well as relative to each other, using a mathematical measure when the drill string length is divided into smaller torsional sections. By the aid of the simulations and mathematical measures, it is shown that manipulation of rotational speeds at the surface may not be an effective solution to reduce the stick slip vibrations, however manipulation of weight on bit and increasing of damping at the bottom of string can be two effective solutions to mitigate these kinds of vibrations. As a general conclusion, it is proved that the manipulation of bottom side drilling parameters is more effective than the manipulation of surface drilling parameters.
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    Article
    Citation - WoS: 4
    Citation - Scopus: 4
    Multi Input Dynamical Modeling of Heat Flow With Uncertain Diffusivity Parameter
    (Taylor & Francis inc, 2003) Efe, MÖ; Özbay, H
    This paper focuses on the multi-input dynamical modeling of one-dimensional heat conduction process with uncertainty on thermal diffusivity parameter. Singular value decomposition is used to extract the most significant modes. The results of the spatiotemporal decomposition have been used in cooperation with Galerkin projection to obtain the set of ordinary differential equations, the solution of which synthesizes the temporal variables. The spatial properties have been generalized through a series of test cases and a low order model has been obtained. Since the value of the thermal diffusivity parameter is not known perfectly, the obtained model contains uncertainty. The paper describes how the uncertainty is modeled and how the boundary conditions are separated from the remaining terms of the dynamical equations. The results have been compared with those obtained through analytic solution.
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    Article
    Citation - WoS: 1
    Citation - Scopus: 3
    A robust on-line learning algorithm for intelligent control systems
    (John Wiley & Sons Ltd, 2003) Efe, MÖ; Kaynak, O; Wilamowski, BM; Yu, XH
    This paper describes a novel error extraction approach for exploiting the strength of Levenberg-Marquardt (LM) optimization technique in intelligent control systems: Since the target value of the control signal is unknown, tuning of the controller parameters becomes a tedious task if the knowledge about the system and the environment is limited. The suggested methodology utilizes the sliding model control (SMC) technique. The error extraction scheme postulates the form of error on the applied control signal using the discrepancy from the prescribed reaching dynamics. The devised approach has been tested on the non-linear Duffing oscillator, which has been forced to follow a periodic orbit radically different from the natural one. The results obtained through a series of simulations have confirmed the high precision and robustness advantages without knowing the analytical details of the system under investigation. The issues of observation noise and the stability in the parametric space have approximately been addressed from the point of SMC perspective. Copyright (C) 2003 John Wiley Sons, Ltd.
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    Article
    Citation - WoS: 3
    Citation - Scopus: 3
    Assessments of World and National Level Wrestling Teams at a Pre World Championship Competition: Hydration, Body Composition and Body Mass Alterations
    (Edizioni Minerva Medica, 2015) Kutlu, M.; Demirkan, E.; Ozbek, M. E.; Department of Electrical & Electronics Engineering
    Aim. This study examined the changes in hydration status, body composition and body mass alterations during the camping period a pre world championship, World (N.=14) and National (N.=38) senior wrestlers (N.=52) preparing for the World Championships. Methods. Urine specific gravity, conductivity and color measurements with, body composition analyses were conducted at the beginning of the camp and the end of the camp. Results. In general, no significant differences were obtained between the world and national wrestlers in body mass and fat percentage (83.3 +/- 20-84.9 +/- 18 kg; 12 +/- 6%-11.2 +/- 4%, respectively). However, a significant difference was detected in the changes of body mass between groups (world decreased [800 +/- 1 g] - national increased [600 +/- 1 g] [P<0.05]). Body fat percentage was also observed to have a similar bias with a decrease and increase, but the changes were not significantly different (P>0.05). No significant differences (P>0.05) were observed between pre- and post-test values of urine specific gravity, conductivity or color for both national team wrestlers. Conclusion. Wrestlers achieved to adjust to weight category in a close of period through competition weigh in. Dehydration training programs should be sustained during the whole camp seasons including the last days before the weighing process for matches.
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    Article
    Citation - WoS: 1
    İndüksiyon Ön Isıtmalı Bir Elektromanyetik Darbe Şekillendirme Sisteminin Deneysel Analizi
    (Gazi Univ, Fac Engineering Architecture, 2020) Baranoğlu, Besim; Özbek, Mehmet Efe; Aydın, Elif
    Bu çalışmada, özellikle otomotiv, uçak, uzay ve savunma sanayinde kullanımları giderek artmakta olanalüminyum, magnezyum, titanyum ve nikel alaşımları gibi gevrek malzemeleri şekillendirebilmek amacıylatasarımı yapılan bir indüksiyon ısıtma sistemi ve bir elektromanyetik şekillendirme sistemi kurulmuştur.Devreye alınan sistemler Al7075 levhaları ile test edilmiştir. İndüksiyon ısıtma sistemi ile ön ısıtması yapılanfarklı kalınlıktaki sac malzemeler elektromanyetik şekillendirme sistemi ile şekillendirilmiş ve bu sürecinetkinliği değerlendirilmiştir. Sistemin, uygun kalıp ve bobin tasarımları ile değişik sanayi uygulamalarındakullanılan metal alaşımlarını ılık ve sıcak olarak nitelendirilecek sıcaklıklarda şekillendirebilecek birkapasiteye sahip olduğu gözlemlenmiştir.
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    Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Discrete Time Neuro Sliding Mode Control With a Task-Specific Output Error
    (Springer, 2004) Efe, MO; Department of Electrical & Electronics Engineering
    The problem of obtaining the error at the output of a neuro sliding mode controller is analyzed in this paper. The controller operates in discrete time and the method presented describes an error measure that can be used if the task to be achieved is to drive the system under control to a predefined sliding regime. Once the task-specific output error is calculated, the neurocontroller parameters can be tuned so that the task is achieved. The paper postulates the strategy for discrete time representation of uncertain nonlinear systems belonging to a particular class. The performance of the proposed technique has been clarified on a third order nonlinear system, and the parameters of the controller are adjusted by using the error backpropagation algorithm. It is observed that the prescribed behavior can be achieved with a simple network configuration.
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    Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Design of a System Solution That Modernizes Legacy Supervisory Control and Data Acquisition Systems as an Early Detection System
    (Sage Publications Ltd, 2018) Demir, Besir; Tumay, Ahmet; Ozbek, Mehmet Efe; Cavus, Enver
    Background: In industrial disasters, early detection of problems and crisis management are critical for saving the lives of people and reducing the impact of disasters. Purpose: In this study, we design a special gateway system that bridges the gap between different communication protocols and enables legacy supervisory control and data acquisition systems to function early detection systems for potential industrial disasters. Methods: The system uses a new queue mechanism to substantially improve the problem of data loss found in conventional supervisory control and data acquisition systems and utilizes identification (ID) prioritization to enable early detection of problems. The proposed system is implemented and tested on a Linux-based, 3G-capable Modbus gateway system. Modbus is used as the communication protocol and 3G technology is utilized to provide high-speed wireless data transfer components. The Modbus gateway device uses an ARM-based EP9302 processor and has digital input/output, relay outputs, and RS485 outputs. Conclusion: This study is significant as it is the first work to show the application of the priority query execution method for Modbus gateway devices.