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Toplam kayıt 218, listelenen: 1-20

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Genişbant Erişim Telekomünikasyon Sistemlerinin Kullanım Kriterleri

Küçükoğlu, Afşin; Baykal, Yahya (1)

Hızla artan bilgisayar ağı ihtiyacını gidermek ve yüksek hızı son kullanıcı noktalarına ulaştırabilmek amacıyla geliştirilmiş olan genişbant erişim sistemlerinin (access systems) teknolojik son durumu incelendi. Herhangi ...
Effects of laser multimode content on the angle-of-arrival fluctuations in free space optics access systems

Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2004)

The effects of the multimode content in a laser beam on the angle-of-arrival fluctuations are examined for free space optics (FSO) access systems. Multimode excitation is represented by coherent addition of Hermite-Gaussian ...
Correlation and structure functions of Hermite-sinusoidal-Gaussian laser beams in a turbulent atmosphere

Baykal, Yahya (Optical Soc Amer, 2004-07)

To study the performance of atmospheric optical links by using Hermite-sinusoidal-Gaussian laser beam sources, we derive the log-amplitude and the phase correlation and structure functions of such beams in a turbulent ...
Propagation of modified Bessel-Gaussian beams in turbulence

Eyyuboğlu, Halil T.; Hardalaç, Fırat (Elsevier Science LTD, 2008-03)

We investigate the propagation characteristics of modified Bessel-Gaussian beams traveling in a turbulent atmosphere. The source beam formulation comprises a Gaussian exponential and the summation of modified Bessel ...
Intensity Fluctuations of Incoherently Superposed Gaussian Beams In Atmospheric Turbulence

Baykal, Yahya (Spie-Int Soc Optical Engineering, 2010)

Intensity fluctuations of incoherently superposed Gaussian beams are formulated in weak turbulence by employing the extended Huygens-Fresnel principle. Each individual beam superposed is taken to be fully incoherent. The ...
Comparative Analysis of Novel Long Life Routing Methods In Mobile Networks

Preveze, Barbaros; Safak, Aysel (IEEE, 2010)

In this study we propose two novel ABR extended Long Life Routing Methods called Alternative enhancement for Enhanced Associativity Based Routing (AEABR) and Associativity Tick Averaged ABR (ATAABR) methods which are also ...
Alternative Enhancement of Associativity Based Routing (Aeabr) for Mobile Networks

Preveze, Barbaros; Safak, Aysel (Springer, 2010)

This study proposes an alternative enhancement for the Enhanced Associativity Based Routing (EABR) method which is a derivation of ABR (Associativity Based Routing) by relative speed and relative distance estimation using ...
Effects of ant colony and fastest path routing algorithms on performance improvement of novel cognitive methods

Preveze, Barbaros; Şafak, Aysel (2010)

This paper demonstrates the usage of novel cognitive methods that improve the throughput of a WIMAX network by minimizing packet loss. The effects of the ant colony and fastest path routing algorithms on the throughput are ...
Effects of type of incidence on the second and fourth order moment parameters evaluated in turbulent atmosphere

Baykal, Yahya Kemal (2010)

Using a general type incidence, the second and fourth order moments are formulated in atmospheric turbulence. Received field and intensity correlations are evaluated and the behaviour of these correlations are compared for ...
Scintillation index of partially coherent asymmetrical multi Gaussian beams in extremely strong turbulence

Öztan, Mehmet Akif; Baykal, Yahya (2010)

It is investigated whether partial coherent asymmetrical annular and flat-topped Gaussian beams provide advantage to decrease the scintillation noise effect when free space optics systems are used in long distance (longer ...
Strong turbulence analysis of sinusoidal and hyperbolic Gaussian beams

Eyyüboğlu, Halil Tanyer (2010)

We formulate the on-axis asymptotic scintillations of sinusoidal and hyperbolic Gaussian beams, namely cos and cosh Gaussian beam, under strong turbulence conditions. Our results are displayed in the form of plots of the ...
Biomedical Device for Early Breast Cancer Detection: Device Performance Improving By Plasmonic-Photonic Mask

Meral, Sanem; Yalçınkaya, Ezel; Eroğlu, Metin; Salmanogli, Ahmad; Geçim, H. Selçuk (SciTePress, 2010)

In this article, a new device to detect breast cancer at an early stage, is presented. The main advantages of the device are its easy operational procedure, portability, high accuracy due to usage of plasmonic-photonic ...
Beam wander of J (0)- and I (0)-Bessel Gaussian beams propagating in turbulent atmosphere

Çil, Celal Zaim; Eyyüboğlu, Halil Tanyer; Baykal, Yahya Kemal; Korotkova, O.; Cai, Y. (2010-01)

Root mean square (rms) beam wander of J (0)-Bessel Gaussian and I (0)-Bessel Gaussian beams, normalized by the rms beam wander of the fundamental Gaussian beam, is evaluated in atmospheric turbulence. Our formulation is ...
Beam wander of J 0- and i 0-Bessel Gaussian beams propagating in turbulent atmosphere

Çil, C.Z.; Eyyuboğlu, H.T.; Baykal, Y.; Korotkova, O.; Cai, Y. (2010-01)

Root mean square (rms) beam wander of J 0-Bessel Gaussian and I 0-Bessel Gaussian beams, normalized by the rms beam wander of the fundamental Gaussian beam, is evaluated in atmospheric turbulence. Our formulation is based ...
Flat-Topped Field Correlations In Extremely Strong Turbulence

Baykal, Yahya (Electromagnetics Acad, 2011)

In extremely strong turbulent horizontal atmospheric optical links, field correlations of flat-topped Gaussian incidence are evaluated. Field correlations are represented versus the diagonal distance at the receiver plane, ...
Fair spectrum sharing in wireless networks

Preveze, Barbaros; Şafak, Aysel (2011)

Efficient utilization of available resources and the avoidance of overload conditions have high importance for any communication network. For a CSMA based VANET the wireless bandwidth must be shared fairly among all nodes. ...
Method of Evaluation of the Mutual Coherence Function of Laser Beams and Its Application for Symmetric Dark Hollow Beams

Banakh, V. A.; Marakasov, D. A.; Rytchkov, D. S.; Baykal, Yahya; Eyyuboğlu, Halil T. (Spie-Int Soc Optical Engineering, 2011)

In our report, a method of evaluation of the mutual coherence function (MCF) of optical wave propagating in turbulent atmosphere is proposed. The method is based on using inverse Fresnel transform and 2-D Fast Fourier ...
Işık hüzmesi profili ölçme sistemi

Bük, Murat; Baki, T.; Çil, Celal Zaim; Cambaz, Göknur; Baykal, Yahya Kemal; Erseven, S.; Karabulut, S.; Ertuğ, A. Mithat (2011)
A New Narrow Band Dual-Mode Microstrip Slotted Patch Bandpass Filter Design Based On Fractal Geometry

Mezaal, Yaqeen S.; Eyyuboğlu, Halil T. (IEEE, 2012)

A narrowband, compact, and easily fabricated microstrip bandpass filter design is introduced in this paper as a candidate for use in modern wireless systems. The proposed filter design is based on the use of dual-mode (two ...
Wavelet based flame detection using differential PIR sensors

Erden, F.; Töreyin, Behçet Uğur; Soyer, E. B.; İnaç, İ.; Günay, O.; Köse, K.; Çetin, A. Enis (IEEE, 2012)

In this paper, a flame detection system using a differential Pyro-electric Infrared (PIR) sensor is proposed. A differential PIR sensor is only sensitive to sudden temperature variations within its viewing range and it ...

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