DSpace@Çankaya

Yazar "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği" için Mühendislik Fakültesi listeleme

Yazar "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği" için Mühendislik Fakültesi listeleme

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  • Scintillation properties of dark hollow beams in a weak turbulent atmosphere 
    Chen, Y.; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Springer, 2008-01)
    The on-axis scintillation index for a circular dark hollow beam (DHB) propagating in a weak turbulent atmosphere is formulated, and the scintillation properties of a DHB are investigated in detail. The scintillation index ...
  • Scintillations of cos-Gaussian and annular beams 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2007-01)
    Based on the generalized beam formulation, we derive the scintillation index and selectively evaluate it for cos-Gaussian and annular beams propagating in weak atmospheric turbulence. Dependence of the scintillation index ...
  • Scintillations of higher-order laser beams in non-Kolmogorov medium 
    Baykal, Yahya (Optical Soc Amer, 2014-04-01)
    In an atmospheric medium that shows a non-Kolmogorov turbulence behavior, the variation of the on-axis scintillation index is evaluated when higher-order laser modes are used as the excitation. The Rytov method is employed ...
  • Scintillations of Laguerre Gaussian beams 
    Eyyuboğlu, Halil T.; Baykal, Yahya; Ji, X. (Springer, 2010-03)
    By using the Rytov method, we formulate and numerically evaluate the scintillations of Laguerre Gaussian beams in weak atmospheric turbulence. Our results indicate that at on-axis positions, Laguerre Gaussian beams with ...
  • Scintillations of laser array beams 
    Eyyuboğlu, Halil T.; Baykal, Yahya; Cai, Yangjian (Springer, 2008-05)
    The scintillation index of a laser array beam is analytically derived and numerically evaluated for weak turbulence conditions. On-axis as well as off-axis positions of the receiver plane are considered. Our graphical ...
  • Scintillations of multiwavelength Gaussian, cos, cosh and annular Gaussian beams 
    Eyyuboğlu, Halil T. (Springer, 2012-01)
    We provide the scintillation formulation for a multiwavelength source. Within this context, the scintillation aspects of Gaussian, cos, cosh and annular Gaussian beams are investigated. For all situations examined, it is ...
  • Scintillations of optical plane and spherical waves in underwater turbulence 
    Ata, Yalçın; Baykal, Yahya (Optical Soc Amer, 2014-07-01)
    The scintillation indices of optical plane and spherical waves propagating in underwater turbulent media are evaluated by using the Rytov method, and the variations in the scintillation indices are investigated when the ...
  • Scintillations of partially coherent Laguerre Gaussian beams 
    Yüceer, Mehmet; Eyyuboğlu, Halil T.; Lukin, I. P. (Springer, 2010-12)
    Scintillations of Laguerre-Gaussian (LG) beams for weak atmospheric turbulence conditions are derived for on-axis receiver positions by using Huygens-Fresnel (HF) method in semi-analytic fashion. Numerical evaluations ...
  • Scintillations of partially coherent multiple Gaussian beams in turbulence 
    Baykal, Yahya; Eyyuboğlu, Halil T.; Cai, Yangjian (Optical Soc Amer, 2009-04-01)
    For an incidence composed of partially coherent multiple Gaussian beams, Huygens-Fresnel principle-based on-axis scintillation index is formulated in a weakly turbulent homogeneous horizontal atmospheric path. Our general ...
  • Simulator for general-type beam propagation in turbulent atmosphere 
    Arpalı, Çağlar; Yazıcıoğlu, Canan; Eyyuboğlu, Halil T.; Altay Arpalı, Serap; Baykal, Yahya (Optical Society of America, 2006-10)
    A simulator is designed in MATLAB code which gives the propagation characteristics of a general-type beam in turbulent atmosphere. When the required source and medium parameters are entered, the simulator yields the average ...
  • Sinusoidal Gaussian beam field correlations 
    Baykal, Yahya (IOP Publishing Ltd, 2012-07)
    Field correlations of sinusoidal Gaussian beams are formulated in turbulence, and specifically cos Gaussian (cG) and cosh Gaussian (chG) beam field correlations are evaluated versus the diagonal length at the receiver ...
  • SNR bounds of FSO links and its evaluation for selected beams 
    Eyyuboğlu, Halil T.; Bayraktar, Mert (Taylor&Francis Ltd, 2015)
    We formulate the signal-to-noise ratio (SNR) for free-space optical links. Upon inserting typical operating parameters, it is seen that SNR well approximates to the inverse of aperture averaged scintillation parameter. By ...
  • Speckle contrast for flat-topped field profiles 
    Baykal, Yahya (Elsevier Science Ltd, 2013-02)
    Speckle contrast is evaluated for flat-topped field profiles where the characterization and evaluation of speckle contrast are based on mathematical formulation and theoretical parameter variation. The speckle field which ...
  • Spectral shifts of general beams in turbulent media 
    Eyyuboğlu, Halil T.; Cai, Yangjian; Baykal, Yahya (IOP Publishing Ltd, 2008-01)
    Using the concept of generalized beam, by applying the extended Huygens-Fresnel principle, we derive the spectrum for partially coherent cosh-Gaussian, cos-Gaussian, Gaussian and annular Gaussian beams propagating in ...
  • Spectrum-aware and energy-adaptive reliable transport for internet of sensing things 
    Biçen, A. Ozan; Ergül, Özgür; Akan, Özgür B. (IEEE-Inst Electrical Electronics Engineers Inc, 2018-03)
    Wireless sensors equipped with cognitive radio, i.e., cognitive radio sensor networks (CRSN), can access the spectrum in an opportunistic manner and coexist with licensed users to mitigate the crowded spectrum problem and ...
  • State of polarization of a stochastic electromagnetic beam in an optical resonator 
    Korotkova, Olga; Yao, Min; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2008-11)
    On the basis of the unified theory of coherence and polarization, we investigate the behavior of the state of polarization of a stochastic electromagnetic beam in a Gaussian cavity. Formulations both in terms of Stokes ...
  • Strategy creation, decomposition and distribution in particle navigation 
    Beldek, Ulaş; Leblebicioğlu, Kemal (Elsevier Science, 2007-02-01)
    Strategy planning is crucial to control a group to achieve a number of tasks in a closed area full of obstacles. In this study, genetic programming has been used to evolve rule-based hierarchical structures to move the ...
  • Structural forms and energies of Nin, n = 12-14, clusters 
    Güvenç, Ziya B.; Güvenç, Dilek; Jellinek, Julius (1999)
    Equilibrium structural forms of the Nin, n = 12-14, clusters, as defined by an embedded-atom potential, are obtained using molecular dynamics and thermal quenching simulations. The isomers (locally stable geometric forms) ...
  • Structure and energetic of Bn (n 2–12) clusters: electronic structure calculations 
    Atış, Murat; Özdoğan, Cem; Güvenç, Ziya B. (Wiley-Blackwell, 2007-03-05)
    The electronic and geometric structures, total and binding energies, first and second energy differences, harmonic frequencies, point symmetries, and highest occupied molecular orbital–lowest unoccupied molecular orbital ...
  • Structure functions for optical wave propagation in underwater medium 
    Ata, Yalçın; Baykal, Yahya (Taylor&Francis Ltd, 2014-04-03)
    The features of the wave structure function (WSF) derived for spherical excitation in turbulent water are investigated. It is found that as the rate of the dissipation of turbulent kinetic energy e decreases, WSF increases. ...