Feza Kerestecioglu

Feza Kerestecioglu
Kadir Has University | KHU · Computer Engineering

Ph.D.

About

36
Publications
4,864
Reads
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212
Citations
Citations since 2017
10 Research Items
57 Citations
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2017201820192020202120222023051015
Introduction
I received my PhD degree from UMIST, in 1992. Until 2002, I served in the Dept. of Electrical-Electronics Eng’g, Boğaziçi University. Then, I joined Kadir Has University, where I was affiliated with the Dept. of Electronics Eng’g, and after 2012, with the Dept. of Computer Eng’g. My research interests include control systems, fault detection and diagnosis, input and experiment design, robot swarms, blended learning, indoor positioning, and English-medium-instruction.
Additional affiliations
September 1992 - September 2002
Bogazici University
Position
  • Faculty Member
Education
September 1987 - May 1992
University of Manchester Institute of Science and Technology
Field of study
  • Control Systems
October 1983 - July 1985
Bogazici University
Field of study
  • Electrical-Electronics Engineering
October 1978 - July 1983
Bogazici University
Field of study
  • Electrical Engineering

Publications

Publications (36)
Article
In this paper, federated Kalman filter (FKF) is applied for indoor positioning. Position information that is multi-laterated from the distance information obtained using the received signal strengths collected from several access points are processed in a FKF to estimate the position of the target. Two approaches are presented to adjust the informa...
Chapter
Full-text available
"It is the aim of this chapter to problematize EMI in the context of Turkish higher education, approaching the phenomenon by this definition. Following the discussion of EMI from a global perspective, the chapter reviews the body of the body of research conducted in Turkey, highlighting the major issues related to EMI practices in Turkish higher ed...
Data
Please see the following YouTube video in which I present our paper on behalf of my co-authors an invited graduate seminar talk at Kadir Has University on 16 April 2021. https://youtu.be/fQIHpAWokWQ
Technical Report
Full-text available
Ülkemiz öğretim dili İngilizce olan (English Medium Instruction --— EMI) üniversitelerin çok yaygın olduğu ülkeler arasındadır. Bir üniversitenin bugün tüm dünyada ortak iletişim dili haline gelen bir dilde eğitim yapması, mezunlarına uluslararası sektörlerde iş bulma ve akademik bilgi üretimine doğrudan katkıda bulunabilme açısından avantaj sağlay...
Technical Report
Full-text available
Final Report of the symposium "English as the Medium of Instruction in Universities: A Holistic Approach" held on June 19th, 2018 in Istanbul. English translation: Yavuz Kurt
Conference Paper
Full-text available
In this paper, we present the results of the second phase of a study that we have been conducting since the 2016–2017 academic year at a private university in Turkey. This phase of the study was conducted in a compulsory sophomore-level core engineering course of the Electrical-Electronics Engineering undergraduate programme. The online components...
Conference Paper
Full-text available
Blending On-line Tools in Engineering Courses On-line course materials such as videos, web pages and so on are generally assumed to be more effective with large classes as they provide a unidirectional medium of instruction. On the other hand, some on-line tools, such as, discussion boards and forums that aim to facilitate feedback between student...
Article
Full-text available
We consider the connectivity of autonomous mobile robots. The robots navigate using simple local steering rules without requiring explicit communication among themselves. We show that using only position information of neighbors, the group connectivity can be sustained even in the case of bounded position measurement errors and the occlusion of rob...
Conference Paper
Full-text available
We consider connected navigation of autonomous mobile robots with transitions in the group formation. The robots navigate using simple local steering rules without requiring explicit communication among themselves. The formations are achieved by designing proper cost functions and formation transitions are succeeded by switching among these cost fu...
Conference Paper
Full-text available
This article discusses the connectivity of autonomous mobile robots that do not have communication capabilities. We show that if the group members follow the proposed Local Steering Strategy, which utilizes information only about the relative positions of neighbor robots, they can sustain their connectivity, even in the case of bounded position mea...
Conference Paper
Full-text available
The navigation of autonomous mobile robots as a group is considered in this paper. Definitions adopted from the graph theory are given to characterize the robot group. A local steering strategy is proposed such that when each robot in the group applies this steering scheme, the overall result is that the whole group is displaced without losing its...
Article
Full-text available
In this paper, a controller design method for linear MIMO systems is presented which a sliding mode controller is reconfigured in case of system faults. Faults are detected with the residual vector generated from a standard linear observer. Once a fault has been detected the fault distribution matrix can be obtained and used to update the correctiv...
Article
Full-text available
In this paper, a controller design method for underwater vehicles is presented, which is based on re-configuration of a sliding-mode controller in case of disturbances caused by shallow water conditions. The disturbance distribution information can be obtained and used to update the corrective gain vector of the sliding-mode controller. This increa...
Article
Full-text available
The effects of auxiliary input signals on detecting changes in ARMAX processes via statistical tests are discussed. Two extensions to the Cumulative Sum Test are considered. The first is applicable when the direction of the change in the parameter space is known but its magnitude is unknown. The second is applicable when neither is known. The perfo...
Conference Paper
Full-text available
An indirect adaptive controller is designed for submersibles. The design is developed using a linearized MIMO model of a submarine. Standard recursive least squares estimation method is used to estimate the parameters. Depth and pitch angle of the submarine is controlled by means of the well-known indirect self-tuning method. In case of a system fa...
Article
Full-text available
In this paper, a submarine controller is presented which can accommodate the sea wave effects on a submarine at shallow water operation. Sliding mode method is implemented in a way that the robustness of the controller increased with respect to disturbance distribution vector in order to perform the depth control of a shallow submerged submarine un...
Article
Full-text available
In this work, detection of abrupt changes in continuous-time linear stochastic systems and selection of the sampling interval to improve the detection performance are considered. Cost functions are proposed to optimize both uniform and nonuniform sampling intervals for the well-known cumulative sum algorithm. Some iterative techniques are presented...
Article
Full-text available
Minimum shift keying (MSK) modulation has features such as constant envelope, compact spectrum and good error performance, which are all desirable in many digital applications including mobile radio. Numerous receiver structures to demodulate MSK have been suggested, such as correlation receivers, differential detectors and frequency discriminators...
Article
Full-text available
In this paper, a novel scheme is proposed to adapt the gains of a sliding mode controller (SMC) so that the problems faced in its practical implementations as a motion controller are overcome. A Lyapunov function is selected for the design of the SMC and an MIT rule is used for gain adaptation. The criterion that is minimized for gain adaptation is...
Chapter
Full-text available
The problem of detecting abrupt changes in dynamical systems has gained importance recently as the demand for fault tolerant and reliable engineering systems has increased. The detection of malfunctions and performance degradations in complex automatic systems is crucial to assure safe and low cost operation. This aspect of change detection is refe...
Article
Full-text available
This paper demonstrates the estimation of signals by using a neural network structure composed of cosine neurons. The building blocks of the architecture are cosine components with adjustable amplitude, frequency and phase. The training procedure is based on the mixture of gradient descent with a method utilizing sliding mode control philosophy. Th...
Conference Paper
Full-text available
A discrete-time predictive controller is designed for an aerodynamically controlled missile. In order to keep the actuator outputs within the saturation limits, the cost function underlying the design incorporates penalties on, both, the amplitude and the increments of the control signal. Since the missile has time-varying parameters, to adapt the...
Article
Full-text available
An indirect adaptive controller is designed for aerodynamically driven missiles. The design is developed using a linearized model of a missile. Recursive least squares estimation method with exponential forgetting is used to estimate the time-varying missile parameters. A covariance management algorithm is suggested to prevent the exponential incre...
Article
Full-text available
In this paper the performance of predetection maximal ratio and equal gain combiners are investigated under conditions of correlated branch noise. A statistical model is devised to determine the spatial noise correlation coefficients at metropolitan‐area base stations, and the cases where significant correlation is likely are clarified. Optimal wei...
Conference Paper
Full-text available
The effects of auxiliary input signals on detecting changes in CARMA models via statistical tests are discussed. It is assumed that parameters of the system before the change are known whereas those describing the after-change situation are unknown. The performance criteria for the input design are based on the local and asymptotic properties of th...
Article
Full-text available
The effects of auxiliary input signals on detecting changes in CARMA models via statistical tests are discussed. It is assumed that only the direction of the change in the parameter space is known, whereas the change magnitude is unknown. The performance criteria for the input design is based on the local and asymptotic properties of the test. It i...
Article
Full-text available
The properties of a sequential probability ratio test to decide on the parameter values of a stationary autoregressive process are investigated. An analogue of Wald’s Fundamental Identity is derived for this case. The average sample number and operating characteristics of the test are obtained using this identity and some useful approximate express...
Book
Full-text available
This work is concerned with the detection and diagnosis of abrupt changes in the dynamics of single input single output stochastic systems and the design of auxiliary inputs for this purpose. First, the problem is put in a decision theoretic framework and the concepts of classical decision theory (where no input is available to the decision maker)...
Article
Full-text available
This paper analyzes the sequential decision problem related to failure detection and diagnosis in dynamical systems when an input to the data generating mechanism is available to the decision-maker. The sequential decision rules are augmented by an input design rule. It is shown that some important properties of the decision rules related to the cl...
Conference Paper
Full-text available
—This paper analyzes the sequential decision problem related to failure detection and diagnosis in dynamical systems when an input to the data generating mechanism is available to the decision-maker. The sequential decision rules are augmented by an input design rule. It is shown that some important properties of the decision rules related to the c...
Article
Full-text available
In this work, application of the Cumulative Sum Test in detecting faults on a two-link robot manipulator is considered. A continuous-time analogue of the CUSUM test, rather than the traditional discrete-time version, is used. The detection is based on the errors of the state estimates produced by Kalman filters, which use quasi-linear models of the...
Article
Full-text available
A self-reconfiguring controller is designed for pneumatic servo mechanisms. For safety critical processes, actuators are important elements of the overall system and may not be desirable to shut down the process when a fault occurs in the actuator. To prevent a system shut-down and proceed even if actuator is faulty, a self-constructing controller...

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Projects

Projects (4)
Project
This "THE SCIENTIFIC AND TECHNOLOGICAL RESEARCH COUNCIL OF TURKEY (TÜBİTAK) 1001" Project, which is coordinated by Assoc. Prof. Hale Işık Güler from Middle East Technical University (METU), aims to investigate the teaching and learning procedures at English Medium Instruction (EMI) universities in Turkey with the attempt to explore the effective and ineffective practices. The researchers also aim to report the factors that lead to some interactional breakdowns about achieving their program goals in EMI context because of the fact that the language of instruction is different from that of the national language. The partner universities are: Middle East Technical University (Lead partner) Boğaziçi University Kadir Has University Bilkent University Hacettepe University
Project
ENRICH is coordinated by Hellenic Open University, the project coordinator is Prof. Nicos Sifakis. Partner universities are: Boğaziçi University, Roma Tre University, OsloMet, University of Lisbon and CTI. The ‘English as a Lingua Franca Practices for Inclusive Multilingual Classrooms (ENRICH)’ project aims at developing a high-quality Continuous Professional Development (CPD) infrastructure which will empower English language teachers (ELTs) to integrate in multilingual classrooms the current role of English as a Lingua Franca (ELF), i.e. as the most frequently employed means of international and intercultural communication. Please see the link for more information: http://enrichproject.eu/