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Bulunan: 24 Adet 0.001 sn
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A new step size control technique for blind and non-blind equalization algorithms

Ali Özen

A new variable step size (VSS) control technique employing cross correlation between channel output and error signal has been proposed as a solution to the problem of slow convergence of blind and non-blind equalization algorithms. The new method resolves the conflict between the convergence rate and low steady state error of the fixed step-size conventional blind and non-blind equalization algorithms, such as Constant Modulus Algorithm (CMA) and Least Mean Squares (LMS) algorithm. Computer simulations have been performed to verify the performance of the proposed method in frequency selective ...Daha fazlası

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Yapay arı koloni algoritması üzerine kurulan yeni bir modülasyon tanıma yöntemi A new modulation recognition method based on artificial bee colony algorithm

Ali ÖZEN

Bu bildiride, toplanır beyaz Gauss gürültülü (Additive White Gaussian Noise, AWGN) kanala maruz kalmış temel bant sinyallerinin sınıflandırılması için yeni bir sayısal modülasyon tanıma yöntemi önerilmektedir. Önerilen yöntem (ABC-ANN), yapay arı koloni (Artificial Bee Colony, ABC) algoritması ile eğitilmiş yapay sinir ağları (Artificial Neural Networks, ANN) modelidir. ABC-ANN sınıflayıcıda alınan sinyallerin yüksek dereceli logaritmik momentlerinden yararlanılmaktadır ve yapay sinir ağlarının başarımını doğrudan etkileyen optimum ağırlık kümesinin bulunmasında ABC algoritması kullanılmaktadı ...Daha fazlası

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A novel modulation recognition technique based on artificial bee colony algorithm in the presence of multipath fading channels

Ali ÖZEN

In this paper, a novel automatic modulation recognition (AMR) method has been proposed for classifying of the transmitted signals by observing the received data samples in the presence of additive white Gaussian noise (AWGN) and multipath fading channel. The proposed method (ABC-ANN) is based on artificial neural network (ANN) which is trained by artificial bee colony (ABC) algorithm. Because high order statistics are very interesting features to solve the problem of AMR, the high order cumulants have been employed in the proposed ABC-ANN classifier. ABC algorithm is used in finding the optima ...Daha fazlası

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Hybrid tracking controller with attached tuned mass damper

Ali BOZER

The optimization of tuned mass damper (TMD) involves the attachment of a damper to a TMD unit. Although thissupplementary damping renders TMD to be operational under broad bandwidth inputs (i.e., wind excitation), italso considerably decreases the efficiency. In this paper, an alternative approach is suggested to eliminate therequirement for supplementary damping, hence to utilize TMD in full efficiency. For this purpose, combinedstructure/undamped TMD system is equipped with an active controller to track the response of an oscillatorwith natural frequency set to the operating frequency of the ...Daha fazlası

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Algebraic Current-voltage and Voltage Dependent Resistance Expressions for Ballistic Nano Conductors and Their Low Voltage Nonlinearity

Serhan YAMAÇLI

In this study, an algebraic current-voltage (I-V ) equation suitable for the hand-calculation of ballistic nano conductors is derived from Landauer’s formulation. A voltage and temperature dependent resistance expression is also obtained. It is shown that the presented algebraic I-V expression and the original Landauer’s formula give the same characteristics as expected. Moreover, the I-V characteristics of ballistic nano conductors are investigated and it is concluded that there is an inescapable nonlinearity originating from the curvature of Fermi-Dirac distribution function in low voltage r ...Daha fazlası

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Accurate SPICE compatible CNT interconnect and CNTFET models for circuit design and simulation

Serhan YAMAÇLI

SPICE compatible CNT interconnect and CNTFET models in Verilog-A hardware description language are presented in this paper. Metallic CNTs are shown to have current saturation characteristics above a threshold voltage and then modelled with piecewise linear functions. On the other hand, the CNTFET model developed utilizes the calculation of the self-consistent potential of the CNT channel depending on gate and drain voltages. Unlike the previous SPICE-enabled CNTFET models using approximations and curve fittings, the proposed model employs a self-consistent method for the calculation of the cha ...Daha fazlası

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Kayseri ilinde yaşayan 65 yaş ve üzeri bireylerde beslenme durumu ve yaşam kalitesinin saptanması

Neriman İNANÇ | Neşe KAYA

Girifl: Malnütrisyon yafll›larda s›k görülmekte ve yaflam kalitesini düflürmektedir. Bu araflt›rman›n amac›; Kayseri’de yaflayan yafll› bireylerde, beslenme durumu ile yaflam kalitesi aras›ndaki iliflkinin saptanmas›d›r. Gereç ve Yöntem: Araflt›rmaya Kayseri’de yaflayan 1343 erkek, 1262 kad›n olmak üzere toplam 2605 yafll› dahil edilmifltir. Yüz yüze görüflme yöntemiyle; sosyo-demografik özellikleri, Mini Nütrisyonel De¤erlendirme, WHOQOL-OLD yaflam kalitesi formlar›n› içeren anket uygulanm›flt›r. Boy uzunlu¤u, vücut a¤›rl›¤›, bel ve kalça çevresi ölçümleri yöntemine uygun olarak yap›lm›fl ve ...Daha fazlası

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Staff nurses knowledge and perceived responsibilities for delivering care to patients with ıntestinal ostomies

Hülya UÇAR

PURPOSE: The purpose of this study was to explore the opinions of nurses regarding their knowledge of and perceived responsibility for providing ostomy care. SUBJECTS AND SETTING: The target population of this descriptive study was staff nurses working in an acute care hospital in Ankara, Turkey. METHODS: Data were collected by a questionnaire that included 2 sections. The fi rst section queried descriptive information about the nurses, the perceived responsibility for providing ostomy care for patients. The second section included 54 items that focused on knowledge about stoma care. RESULTS: ...Daha fazlası

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