Yazar "Dilaver, Kamil Fatih" seçeneğine göre listele

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    Luenberger based Observer Design in Time Delay Systems
    (IEEE, 2016) Yilmaz, Bayram Melih; Canevi, Mehmet; Dilaver, Kamil Fatih
    Observers are necessary to use in case of an urge to control a linear single input-single output system with feedback control or in a necessity to measure states of the system which are not avaliable for measurement or the high cost of the state measurements. Even though simple electrical system states are not effected very much from time delay, the mechanical systems and electrical transmission lines are more effected. To observe the states of a time delay system a time delay observer is necesarry. In this paper we have proposed a new observer for time delay systems via linearizing the delay term in the Laplace domain and we have compared the results with previous observer designs with simulations.
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    Proportional-Derivative Observer Design via BMI Approach using BARON Optimization
    (IEEE, 2016) Canevi, Mehmet; Yilmaz, Bayram Melih; Dilaver, Kamil Fatih
    This work begins with LMI formulations of Proportional and Derivative observer designs and continues with derivation of the error dynamics of the Proportional-Derivate observer. Proportional observer and Derivative observer are combined to acquire the Proportional-Derivative observer. The observers which are combined can be designed via LMI methods but the new observer can only be designed via BMI formulations. A substitution is used for a term in the error dynamics in order to obtain the BMI formulation of the proposed observer. The performance is optimized via gain minimization, decay rate maximization and L-2 gain minimization. BARON is used to solve the BMI problem to design a PD observer for the given example. BARON is a software that solves nonconvex optimization problems for global optimality via Branch and Bound optimization algorithm. A comparision of three different designs are given to verify that the optimization criteria are valid.
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    Variable Window Size for Stereo Image Matching Based on Edge Information
    (IEEE, 2017) Emlek, Alper; Peker, Murat; Dilaver, Kamil Fatih
    Fixed window sized methods have usually poor performance compared to variable window size methods due to the noise and context of the scene. In this work, a new variable window size method is proposed for the cost aggregation step of stereo matching. The main idea is to find the depth change regions and match them correctly. Based on the observations, it was seen that the depth changes occurred around the edges of an image. Due to this, the proposed method is designed to determine the window size based on the edge information and match the variable areas of an image. The experimental results are analyzed with the Middlebury stereo evaluation dataset. The proposed method is compared with the sum of absolute differences (SAD) method in different window sizes.
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    Variable window size for stereo image matching based on edge information
    (Institute of Electrical and Electronics Engineers Inc., 2017) Emlek, Alper; Peker, Murat; Dilaver, Kamil Fatih
    Fixed window sized methods have usually poor performance compared to variable window size methods due to the noise and context of the scene. In this work, a new variable window size method is proposed for the cost aggregation step of stereo matching. The main idea is to find the depth change regions and match them correctly. Based on the observations, it was seen that the depth changes occurred around the edges of an image. Due to this, the proposed method is designed to determine the window size based on the edge information and match the variable areas of an image. The experimental results are analyzed with the Middlebury stereo evaluation dataset. The proposed method is compared with the sum of absolute differences (SAD) method in different window sizes. © 2017 IEEE.
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    Yer altına gömülü üç boyutlu cisimlerin bozulmuş born iteratif yöntemi ile tespitedilmesi
    (2021) Akdoğan, Rıza Erhan; Dilaver, Kamil Fatih; Durukan, Tülün; Altuncu, Yasemin
    Bu çalışmada, yer altında gömülü üç boyutlu (3B) cisimlerin geometrik ve elektriksel özelliklerinin yer üstünden yapılan ölçümlerle belirlenmesine yönelik bir elektromanyetik ters saçılma problemi ele alınmıştır. Problemin çözümü bozulmuş born iteratif yöntemi (Distorted Born Iterative Method - DBIM) kullanılarak yapılmıştır. Hava ve toprak ortamlarını birbirinden ayıran ara yüzey yukarıdan bir elektromanyetik dalga kaynağı ile aydınlatılmış ve yine yukarıdaki bir bölge boyunca elektrik alan ölçümleri yapılmıştır. Elektromanyetik dalga kaynağı olarak peş peşe farklı geliş açılarıyla gönderilen düzlem dalgalar kullanılırken ölçümler bir düzlem boyunca birden fazla noktada alınmıştır. İlgilenilen hacimsel bir bölgede bulunan cisimlerin geometrik ve elektrikselözellikleri, bu bölgenin kompleks dielektrik sabitinin belirlenmesi sonucu ortaya çıkartılmaktadır. Sunulan yöntemin, yer altındaki rastgele geometrili üç boyutlu nesnelerin tespitindeki başarısını göstermek için çeşitli sayısal sonuçlar sunulmuştur. Elde edilen sonuçlar, bozulmuş born iteratif yönteminin düşük ve orta düzeyde kontrasta sahip cisimlerin hem geometrik hem de dielektrik özelliklerinin belirlenmesinde oldukça başarılı olduğunu ortaya koymaktadır. Yüksek kontrastlı cisimlerin ise yeri ve geometrik özellikleri başarıyla bulunurken bağıl dielektrik sabiti ve iletkenlikleri gerçek değerlerinden daha düşük seviyelerde bulunmuştur.