Elektrik- Elektronik Mühendisliği

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Ferroresonance
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1961., 1961.) Sarc, Faruk.
Study of the influence of unbalanced and wave form of the applied voltage systems on the output torque and asynchronous machine
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1961., 1961.) Halıcı, Kemal.
Parametric amplifiers using tunnel diodes as negative resistance element
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1965., 1965.) Karabekir, Mehmet Erhan.; Santur, Mustafa,
Single sideband communication systems
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1965., 1965.) Tunca, Gür.
Speed control of three-phase induction motors by changing air-gap flux
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1965., 1965.) Dinçer, Gönül.; Tanyolaç, Necmi,
In this paper the speed control of three-phase induction motors by changing the air-gap flux is studied with D.C or Singlephase A.C voltage applied to the auxiliary stator winding. In parts A and B the theoretical concept underlying the experimental results had been explained for both D.C and singlephase A.C control cases. In parts C, D and E experimental studies and results are discussed. D.C voltage applied to the auxiliary stator winding with six or twelve poles proved to be more convenient for the speed control. The theoretical and experimental studies indicates the possibility of a smooth speed control method for three-phase induction motors within certain limits.
Evaluation of P-N junction lasers for communication purposes
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1967., 1967.) Önol, Alp.; Santur, Mustafa,
Field effect transistors, theory and applications
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1967., 1967.) Gözüm, Ferize.
A possible electrical equivalent circuit for the electro-odocell
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1967., 1967.) Çelebi, Gürbüz.; Tanyolaç, Necmi,
Distributed amplifiers for wide-band amplification
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1967., 1967.) Kasuto, Josef.; Santur, Mustafa,
A survey of superconductivity
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1969., 1969.) Uluğ, Yusuf.; Santur, Mustafa,
A study of infrared principles with emphasis on thermal detection
(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1969., 1969.) Demirelli, Atanur.; Tanyolaç, Necmi,
A survey of infrared principles is given in an attempt to determine the factors effecting the performance of infrared detection system. Various detection phenomena are discussed in a comparative manner. A full treatment of thermal detection theory is given. Possible experimental procedures are investigated for the construction of thermally sensitive materials. Although an effective experimental procedure cannot be developed with the present facilities, the use of vacuum deposition is shown to give satisfactory results if certain provisions are made.
Light amplification and light amplifiers
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1969., 1969.) Balkan, Deniz.; Santur, Mustafa,
A study of behavior of dielectrics subject to weak electric fields
(Thesis (M.S.)- Robert College. Faculty of Graduate School of Engineering, 1969., 1969.) Göktuna, Erol.; Tanyolaç, Necmi,
The aim of this report is to investigate dielectric behavior at weak electric field. The behavior of permittivity, a defining property of dielectric materials, at weak fields is mostly discussed. The theoretical approach implies that the permittivity is not influenced by the field intensity at relatively weak electric fields. However, the external disturbances such as frequency, temperature, and humidity, play an important role in determining the permittivity. The temperature and frequency dependence of dielectric materials are also considered in connection with the electric field. The behavior of six different dielectric samples at relatively weak electric fields are investigated. These samples are.being used in Electro-Odqcell, an objective odor measuring instrument, on which a research work is going on at Robert College Research Center, under the supervision of Prof. Dr. Necmi Tanyolaç.
Sayısal ve analog holografi ile iletişim ve bilgi işleme için geliştirilen bazı yeni yöntemler
(Thesis (Assoc. Prof.) - Bogazici University. Institute of Sciences and Engineering, 1978., 1978.) Ersoy, Okan.
Two approaches to min-max feedback control and design of uncertain systems
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.) Eksin, İbrahim.; Istefanopulos, Yorgo.
In designing control systems with optjmal performance parameter variations pose a great problem. In prjnciple, it is possible to attain an ideal performance by sensing the uncertain parameters and using an adaptive controller. But such controllers are usually difficult or expensive to realize and there is a strong motivation for considering simpler controllers. The simpler control strategy under parameter uncertajnty is the min-max controller which operate the system according to one control law that minimizes the maximum varjations from the optima corresponding to each parameter. There exist various methods to find the parameters of the min-max controller. In this study two approaches have beeh considered to find the min-max controller parameters: iterative or search procedure, and game theoretic approach.
Nondestructive testing of concrete by ultrasound
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.) Kumcuoğlu, Ali Sina.; Kahveci, Adnan.
In this thesis, nondestructive testing of materials using Ultrasonic techniques has been investigated. Especially the determination of the quality of concrete, how the sonic wave behaves in concrete, relation of acoustic velocity to Elasticity Modulus and to compressive strength, and other problems of testing procedure have been examined. An instrument is built up for this purpose which is designed to measure the transit time of sound propagation in a medium between two Ultrasonic Tansducers and to display it in microseconds. Thus, the velocity of s01md in the medium can easily be derived. If the medium is concrete, then, from the velocity the quality of concrete and other parameters can be determined. The instrument in fact can easily be adapted for transit time measurements of other kinds of materials or media for testing purposes. The instrument basically consists of transmitter and receiver circits, counter, control unit and transducers. With the start pulse the circuit starts counting and at the same time the Ultrasonic wave is transmitted. With the stop pulse which is created after detection of the sonic wave, counting ceases and the time elapsed occursrs on the digital display. The instrument also makes it possible to locate the depths of the flaws inside e. g. cracks, and to determine thickness, if sound velocity in the sample is known.
Digital heart rate monitor and clinical thermometer
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.) Altay, Cemil Müjdat.; Kahveci, Adnan.
In this thesis, a heart rate monitor and digital thermometer has been designed and, built. This instrument has low and high alarms for heart rate and temperature. The device does not need frequent calibration and has an operating range, for the heart rate monitor; from 20 to 200 beats/min with an accuracy of +- 5%, for digital thermometer; from 30 to 4S C with an accuracy of +-1%. The design is realized with usual TTL integrated circuit. The Major goal was to produce a desk-top heart- rate -thermometer monitor which allows to calculate heart rate and temperature with enough accuracy, and to realize this in an economical way. The results obtained are quite satisfactory both in performance and economy.
Design of optimal sampled data linear regulator
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1979., 1979.) Ayzan, Ömer.; Istefanopulos, Yorgo.
Optimal Sampled-data control for linear time invariant processes with quadratic cost criteria are determined through the application of the discrete minimum principle. In order to apply the discrete minimum principle. both continuous system's state equations and integral performance indices are discretized. An extensive work is done to find an analytical expression for the dependance of the optimal control on the sampling period. Thus the effect of changing the sampling time upon the closed loop system's performance is investigated. Based on the theory cited above original numerical methods and a computer program have been developed, to compute optimum sampling period and the matrix of optimum feedback gains. Then for various linear time invariant processes numerical results are obtained for the sampling period and the optimal control and, the associated costs are evaluated. Additionally the trajectories of the states, and the controls are plotted within the time interval of interest.
A harmonic balance method and its implementation for the steady-state analysis of nonlinear networks
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.) Kavaklıoğlu, Ömer.; Göknar, I. Cem.
A method for finding the petiodic solution of nonlinear networks which avoids the time domain solution of the dynamic equations has been investigated. In the method, the network under consideration is decomposed into one linear and several nonlinear subnetworks. Only frequency domain solution of the linear subnetwork is required. Various forms of the Mixed Nodal Tableau equations which are used in formulating the linear subnetwork in the frequency domain are explained through the introduction of a technique for obtaining voltage and current graphs of a network. A new expression for the gradient of the error function in the case that the period T of the oscillations is unknown has been developed and compared to the one derived by Nakhla and Vlach. The method has been, tested on several examples. It is shown. that considerable reduction in the size of the computational problem is achreved by taking advantage of the linearities present in the network.
Modern control problems in linear time-invariant multivariable systems
(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 199., 1981.) Arslanalp, M. Salim.; Göknar, I. Cem.

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