New algorithms and techniques for microprocessor-controlled PWM induction drives

Kükrer, Osman


Improvements in DOA estimation by array interpolation in non-uniform linear arrays
Yaşar, Temel Kaya; Tuncer, Temel Engin; Department of Electrical and Electronics Engineering (2006)
In this thesis a new approach is proposed for non-uniform linear arrays (NLA) which employs conventional subspace methods to improve the direction of arrival (DOA) estimation performance. Uniform linear arrays (ULA) are composed of evenly spaced sensor elements located on a straight line. ULA's covariance matrix have a Vandermonde matrix structure, which is required by fast subspace DOA estimation algorithms. NLA differ from ULA only by some missing sensor elements. These missing elements cause some gaps in...
Potential Utilization of Building Information Models for Planning Maintenance Activities
Akçamete Güngör, Aslı; Garrett, James H (2010-06-30)
The opportunities for leveraging Building Information Models (BIMs) for facility operations are compelling and yet utilization of BIMs during building operation and maintenance is falling behind the BIM implementations for design and construction. Current studies of BIMs used for the operations phase and commercially available technologies focus on transferring information from the design and construction phases to the operations phase by enabling creation and capturing of digital facility information throu...
Improvements to neural network based restoration in optical networks
Türk, Fethi; Bilgen, Semih; Department of Electrical and Electronics Engineering (2008)
Performance of neural network based restoration of optical networks is evaluated and a few possible improvements are proposed. Neural network based restoration is simulated with optical link capacities assigned by a new method. Two new improvement methods are developed to reduce the neural network size and the restoration time of severed optical connections. Cycle based restoration is suggested, which reduces the neural network structure by restoring the severed connections for each optical node, iterativel...
New Pulse Shapes for CPM Signals
Doyuran, Enis; Tanık, Yalçın (2006-05-10)
A study on finding new pulse shapes for binary CPM (Continuous Phase Modulation) signals to achieve better spectral and detection performance is carried out. Under the constraint that the power spectral density stays below the GSM spectral envelope, pulse shape is optimized to minimize the error probability. Polynomials are utilized in representing pulse shapes. The performance depends on the degree of the polynomials and the pulse length (L). With 8(th) degree polynomials having 4 free parameters, optimiza...
Modification of single walled carbon nanotube thin films for supercapacitor electrodes
Durukan, Mete Batuhan; Ünalan, Hüsnü Emrah; Department of Metallurgical and Materials Engineering (2017)
Electrochemical capacitors, or supercapacitors, attracted a lot of attention in recent years due to their stability under numerous charge-discharge cycles, high charge discharge rates, and high power density when compared to batteries and conventional capacitors. Since their energy density is much lower than batteries, current research on supercapacitors is focused on improving the energy density through the development of novel active materials and innovative design of the electrodes. Carbon nanotubes are ...
Citation Formats
O. Kükrer, “New algorithms and techniques for microprocessor-controlled PWM induction drives,” Ph.D. - Doctoral Program, Middle East Technical University, 1987.