Savacı, Ferit Acar
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Savaci, F. A.
Acar Savacı, F.
Acar Savaci, F.
Savacı, F. Acar
Savacı, FA
Savacı, F. A.
Savaci, Ferit Acar
Savaci, F. Acar
Savaci, FA
Acar Savacı, F.
Acar Savaci, F.
Savacı, F. Acar
Savacı, FA
Savacı, F. A.
Savaci, Ferit Acar
Savaci, F. Acar
Savaci, FA
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Email Address
acarsavaci@iyte.edu.tr
Main Affiliation
03.05. Department of Electrical and Electronics Engineering
Status
Former Staff
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3GOOD HEALTH AND WELL-BEING
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4QUALITY EDUCATION
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5GENDER EQUALITY
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7AFFORDABLE AND CLEAN ENERGY
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
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Documents
47
Citations
331
h-index
9
Documents
48
Citations
244
Scholarly Output
55
Articles
26
Views / Downloads
40418/21987
Supervised MSc Theses
6
Supervised PhD Theses
5
WoS Citation Count
218
Scopus Citation Count
287
Patents
0
Projects
3
WoS Citations per Publication
3.96
Scopus Citations per Publication
5.22
Open Access Source
49
Supervised Theses
11
| Journal | Count |
|---|---|
| International Journal of Bifurcation and Chaos | 5 |
| Fluctuation and Noise Letters | 3 |
| AEU - International Journal of Electronics and Communications | 3 |
| IET Communications | 3 |
| 2009 IEEE 17th Signal Processing and Communications Applications Conference, SIU 2009 | 2 |
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Now showing 1 - 10 of 55
Conference Object Citation - WoS: 1Citation - Scopus: 2Dalgacık Tepeleri Kullanarak İ̇şaretlerin Bileşenlerine Ayrılması(Institute of Electrical and Electronics Engineers Inc., 2007) Özkurt, Nalan; Savacı, Ferit AcarÇok bileşenli durağan olmayan bir işaretin enerjisi tüm zaman-frekans alanına yayılır. Kaynak ayrıştırma gibi bazı uygulamalarda, işaretin farklı zaman-frekans özelliklerine sahip bileşenlerini ayırmak gerekli olabilir. Bu çalışmada, çok bileşenli durağan olmayan bir işaretin dalgacık tepeleri bulunarak bu tepeleri oluşturan doğrular Hough dönüşümünü kullanılarak saptanmış ve analitik olarak modellenmiştir. Her bir doğru parçasına ait işaret bileşeni ayrı ayrı yeniden elde edilmiştir.Conference Object Citation - WoS: 3Citation - Scopus: 2Stochastic Bifurcation in Generalized Chua's Circuit Through Alpha-Stable Levy Noise(Institute of Electrical and Electronics Engineers Inc., 2018) Savacı, Ferit Acar; Yılmaz, SerpilIn this study, we investigate the changes in the dynamics of generalized Chua's circuit through a-stable Levy noise in the framework of stochastic bifurcation concept. By choosing the noise intensity, characteristic exponent (impulsiveness parameter) and the skewness parameter of the a-stable Levy noise as the bifurcation parameters we have observed the qualitative changes in the stationary probability distributions and in the structures of the stochastic attractors.Master Thesis Analysis of Stochastic Dynamical Systems(Izmir Institute of Technology, 2007) Güngör, Mesut; Savacı, Ferit Acar; Savacı, Ferit Acar; Savacı, Ferit AcarIn this thesis, analysis of stochastic dynamical systems have been considered in the sense of stochastic differential equations (SDEs). Brownian motion, which can be considered as a first example of stochastic dynamical systems, its derivation and its properties have been investigated, then the analytic and numerical solution methods of SDE have been studied with the examples from the physical world. In order to construct a random variable in a computer environment, random number generation algorithms have also been investigated. Finally a Matlab-Simulink block for numerical solutions of linear SDEs has been newly developed.Doctoral Thesis Random Communication Systems Based on Alpha-Stable Processes(Izmir Institute of Technology, 2018) Ahmed, Areeb; Savacı, Ferit Acar; Ahmed, Areeb; Savacı, Ferit AcarThis thesis presents alpha-stable carrier based random communication systems (RCSs) as an alternate way to perform covert transmission. The first objective is to develop an optimized model of RCS which consists of a receiver that requires less computational complexity and outperforms the previously proposed receivers. Next, in order to solve the existing synchronization issue in RCSs, the general behavior of fractional lower-order covariance method in α-stable noise environments has been evaluated to establish synchronization in RCSs. An optimized range of values for the associated parameters of α-stable carrier has also been presented to optimize the proposed synchronization method. The second objective is to establish criteria for evaluating and quantifying the security and covertness of RCSs. Therefore, the first security performance tradeoff characteristics (SPTC) have been proposed to compare the security of different RCSs. Moreover, the proposed optimized model of RCS has also been analyzed with respect to the developed security scale, i.e. SPTC. Secondly, the criterion to quantify the covertness of RCSs has also been developed to analyze the proposed RCS. Thirdly, an attack for RCS has also been proposed which highlights the potential vulnerabilities of RCSs. However, the counter-measure guidelines have been prescribed to further enhance the security of RCSs. An inverse system approach has been adopted to propose α-stable noise driven linear time invariant system based transmitter and its corresponding inverse system based receiver as a third objective. It can be considered as the most secure model for αstable noise carrier based RCS till now.Article Skewed Alpha-Stable Distributions for Modeling and Classification of Musical Instruments(Türkiye Klinikleri Journal of Medical Sciences, 2012) Özbek, Mehmet Erdal; Çek, Mehmet Emre; Savacı, Ferit AcarMusic information retrieval and particularly musical instrument classification has become a very popular research area for the last few decades. Although in the literature many feature sets have been proposed to represent the musical instrument sounds, there is still need to find a superior feature set to achieve better classification performance. In this paper, we propose to use the parameters of skewed alpha-stable distribution of sub-band wavelet coefficients of musical sounds as features and show the effectiveness of this new feature set for musical instrument classification. We compare the classification performance with the features constructed from the parameters of generalized Gaussian density and some of the state-of-the-art features using support vector machine classifiers.Article Citation - WoS: 5Citation - Scopus: 8Covert Electromagnetic Nanoscale Communication System in the Terahertz Channel(World Scientific Publishing, 2020) Ahmed, Areeb; Savacı, Ferit AcarIn this paper, an electromagnetic nano random communication system (EM-nRCS) has been proposed which ensures covert communication in the terahertz (THz) band. In the proposed system, the skewed alpha-stable noise shift keying method has been used to transmit random noise signals (RNSs) from the nano-transmitter (NT) by utilizing single-walled/carbon nanotubes-based true random number generator (SWCNTs-TRNG) and a graphene-based nano-antenna. A line-of-sight THz transparency window between 0.1 THz and 0.5 THz in the THz channel with spreading loss, molecular absorption loss and molecular absorption noise has been considered. Due to the broadband nature of the RNSs, the proposed EM-nRCS provides efficient transmission by overcoming the high path loss and intense channel noise arising from random fluctuations in the THz band. Non-coherent nano-receiver (NR) consisting of the modified extreme value method (MEVM) estimator has been proposed to extract the hidden binary information in the received RNSs. The bit error rate performance shows that the proposed EM-nRCS ensures high performance and covertness for future EM nanoscale communication devices.Article Citation - WoS: 2Citation - Scopus: 2Estimating Probability Density Functions and Entropies of Chua's Circuit Using B-Spline Functions(World Scientific Publishing Co. Pte Ltd, 2012) Savacı, Ferit Acar; Güngör, Mesutn this paper, first the probability density functions (PDFs) of the states of Chua's circuit have been estimated using B-spline functions and then the state entropies of Chua's circuit with respect to the bifurcation parameter have been obtained. The results of the proposed B-spline density estimator have been compared with the results obtained from the Parzen density estimator. © 2012 World Scientific Publishing Company.Article Citation - WoS: 5Citation - Scopus: 5The Circuit Realization of Mexican Hat Wavelet Function(Urban und Fischer Verlag GmbH und Co. KG, 2005) Özkurt, Nalan; Savacı, Ferit Acar; Gündüzalp, MustafaA wavelet network circuit implementation for Mexican Hat mother wavelet has been proposed for nonlinear function approximation which can also be used for the realization of the algebraic nonlinear components. The Mexican Hat mother wavelet function has been implemented with discrete circuit components and it has been observed that the experimental waveform obtained from the realized circuit is approximately same as the Spice simulation of the original function. The circuit simulations of exemplar functions implemented in Spice are also given. © 2004 Elsevier GmbH. All rights reserved.Article Citation - WoS: 1Citation - Scopus: 1Controlling the Rotor Angle Stability of Single Machine Infinite Bus System in the Presence of Wiener and Alpha-Stable Levy Type Power Fluctuations(World Scientific Publishing, 2020) Yılmaz, Serpil; Savacı, Ferit AcarThe integration of renewable energy sources into the power systems and the growth of electricity consumption leads to a considerable increase in the power fluctuations. In the first part of this study, the control of the rotor angle stability of single machine infinite bus system in the presence of Wiener type power fluctuations has been achieved by minimizing the corresponding stochastic sensitivity function. In the second part, the power fluctuations have been modeled by alpha-stable Levy processes and since stochastic sensitivity function is not available for alpha-stable Levy processes, then the control of the rotor angle stability has been numerically achieved by minimizing the corresponding rotor angle dispersion for the first time in the literature. © World Scientific Publishing CompanyDoctoral Thesis Markov Olmayan Ortamlar ile Etkileşimdeki Süperiletken Transmon Kübitlerin Kesirli Dinamiği(01. Izmir Institute of Technology, 2025) Savacı, Ferit Acar; Erdoğan, Ruha Uğraş; Savacı, Ferit AcarBu tezde, literatürde ilk defa olmak üzere, Mittag-Leffler (ML) tipi ilintilerin Markov bir çevre ile etkileşimde olan transmon kübitlerin eşfazlılık sürelerinin iyileştirilmesine olan etkisini irdeledik. Tez kapsamında gerçekleştirdiğimiz ikinci çalışmada, literatürde ilk defa, amorf bir çevre içindeki kusur ile etkileşimde olan transmon kübitin zaman dinamiğini analiz ettik. Markov karakteristiğine sahip gürültü eksenine dik uygulanan ML ilintili gürültüye ait karakteristik üstelin (KÜ), eşfazlılık süresine ve kubit durum dağılımına etkisini analiz ettik. Bu kapsamda yayıngan ve rastsal telegraf gürültüsünün kesirli genelleştirilmesinden inşaa ettiğimiz iki tip ML ilintili gürültü kullandık. Eşfazlılık süresinin KÜ ile ifade edilen hafızaya bağlı olarak arttığını gözlemledik. Transmon kübit ve üzerinde üretim aşamasında oluşan amorf kaplamadaki tek bir kusur arasında Gaussian olmayan karakteristiğe sahip enerji yayılımına sebep olabilecek, aynı zamanda etkileşimdeki sistem dinamiğinde uzun süreli hafızaya sebep olabilecek ağır kuyruklu Lévy tipi enerji salınımlarını irdeledik. Çevrenin güç tayfı yoğunluğunun zaman bağımlı olma durumunu zamana bağlı kesirli üstel ile betimledik. Bu ifadeye bağlı olarak, transmon kübitin zaman dinamiğini değişken mertebeli kesirli ana denklem ile ifade ettik; zamana bağlı KÜ ile betimlenen ortamın, kübit eşfazlılık süresine etkisinin, açık kuantum sistemlerinde ilk olmak üzere, bilgisayar benzetimlerini gerçekleştirdik.