Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu: Recent submissions

  • Radius of curvature of Bessel and modified Bessel Gaussian beams 
    Eyyuboğlu, Halil T.; Ji, Xiaoling (Elsevier Science Bv, 2013-07-01)
    We analyze the radius of curvature of Bessel Gaussian (BG) and modified Bessel Gaussian (mBG) beams. The study is based on the results of analytic derivation as well as those of the random phase screen approach. Our results ...
  • Scattering of waves by a half-screen with different face impedances: closed form series solution 
    Umul, Yusuf Ziya (Taylor&Francis Ltd, 2013-07-01)
    A novel series solution is obtained for the scattering problem of waves by a half-plane with different face impedances. The impedance condition is expressed in terms of the sum of Dirichlet and Neumann conditions, multiplied ...
  • Video fire detection - Review 
    Çetin, A. Enis; Dimitropoulos, Kosmas; Gouverneur, Benedict; Grammalidis, Nikos; Günay, Osman; Habiboğlu, Y. Hakan; Töreyin, Behçet Uğur; Verstockt, Steven (Academic Press Inc Elsevier Science, 2013-12)
    This is a review article describing the recent developments in Video based Fire Detection (VFD). Video surveillance cameras and computer vision methods are widely used in many security applications. It is also possible to ...
  • Fall detection using single-tree complex wavelet transform 
    Yazar, Ahmet; Keskin, Furkan; Töreyin, Behçet Uğur; Çetin, A. Enis (Elsevier Science Bv, 2013-11-01)
    The goal of Ambient Assisted Living (AAL) research is to improve the quality of life of the elderly and handicapped people and help them maintain an independent lifestyle with the use of sensors, signal processing and ...
  • Fringe waves on an impedance cylinder 
    Başdemir, Hüsnü Deniz (Elsevier GMBH, 2013)
    Surface diffraction of the plane waves from an impedance cylinder was investigated by the method of physical theory of diffraction (PTD). Physical optics (PO) method was used to gain the uniform scattered fields which are ...
  • The MTPO/Malyughinetz hybrid method for the scattering analysis of parabolic impedance reflectors 
    Umul, Yusuf Ziya (Elsevier GMBH, 2013)
    The scattering process of cylindrical waves, radiated by a line source, from a parabolic reflector is investigated with the MTPO/Malyughinetz hybrid method. The geometrical optics and diffracted waves are evaluated ...
  • The photon momentum 
    Umul, Yusuf Ziya (Elsevier GMBH, 2013)
    The momentum expression of a photon is derived by taking into account the absorption process by an electron. The defect of the actual momentum representation is shown by using the equations of energy and momentum conservation. ...
  • Scintillation analysis of truncated Bessel beams via numerical turbulence propagation simulation 
    Eyyuboğlu, Halil T.; Voelz, David; Xiao, Xifeng (Optical Soc Amer, 2013-11-20)
    Scintillation aspects of truncated Bessel beams propagated through atmospheric turbulence are investigated using a numerical wave optics random phase screen simulation method. On-axis, aperture averaged scintillation and ...
  • Scattering of inhomogeneous plane waves by a resistive half-screen 
    Umul, Yusuf Ziya (Optical Soc Amer, 2013-12-01)
    The scattering process of inhomogeneous plane waves by a resistive half-plane is investigated by using the exact diffracted field expressions. The uniform field representations are obtained with the aid of the uniform ...
  • Changes of the centroid position of laser beams propagating through an optical system in turbulent atmosphere 
    Ji, Xiaoling; Baykal, Yahya; Jia, Xinhong (Elsevier Science Ltd, 2013-12-30)
    In this paper, the effects of atmospheric turbulence, initial field amplitude, optical system and thermal blooming on the centroid position of laser beams propagating through the atmosphere are studied in detail. With the ...
  • Coherence length in non-Kolmogorov satellite links 
    Baykal, Yahya (Elsevier Science Bv, 2013-11-01)
    Behavior of the coherence length in non-Kolmogorov satellite links is investigated. Equivalent structure constants for non-Kolmogorov spectra are employed in order to make relevant comparisons for different non-Kolmogorov ...
  • Scintillation analysis of hypergeometric Gaussian beam via phase screen method 
    Eyyuboğlu, Halil T. (Elsevier Science Bv, 2013-11-15)
    We give a scintillation treatment of hypergeometric Gaussian beams via the use of random phase screens. In particular, we analyse the on-axis, point-like and aperture averaged power scintillation characteristics of this ...
  • Diffraction of waves by a perfectly conducting half-plane between two dielectric media 
    Umul, Yusuf Ziya (Elsevier Science Bv, 2014-01-01)
    The scattered fields by a perfectly conducting half-plane, located at the interface of two dielectric media, are investigated. The diffracted fields are defined with novel reflection and transmission coefficients that are ...
  • Average transmittance in non-Kolmogorov turbulence 
    Ata, Yalçın; Baykal, Yahya; Gerçekçioğlu, Hamza (Elsevier Science Bv, 2013-09-15)
    Average transmittance in non-Kolmogorov turbulence is evaluated. Our recently published equivalent structure constant formulation is employed in our numerical evaluations. At the fixed propagation distance and wavelength, ...
  • Türbülanslı ortamda yayılan super Lorentz-Gauss laser demetleri için ber analizi 
    Gökçe, Muhsin Caner; Sarı, Filiz; Özek, Faruk (Gazi Univ, Fac Engineering Architecture, 2013-12)
    Çalışmada, türbülanslı ortamda yayılan super Lorentz-Gauss laser demetlerinin yatay iletim uzaklıklarındaki BER - SNR değişimi hesaplandı. BER hesaplamalarında kullanılan pırıldama indisleri, genişletilmiş HuygensFresnel ...
  • Receiver-aperture averaging of annular beams propagating through turbulent atmosphere 
    Kamacıoğlu, Canan; Baykal, Yahya; Yazgan, Erdem (Spie-Soc Photo-Optical Instrumentation Engineers, 2013-12)
    For an annular beam incidence, the power scintillation index in a weakly turbulent atmosphere is derived at the receiver plane, which has a Gaussian aperture. Employing this derivation, the receiver-aperture averaging ...
  • Field correlations of laser arrays in atmospheric turbulence 
    Baykal, Yahya (Optical Soc Amer, 2014-03-01)
    Correlations of the fields at the receiver plane are evaluated after a symmetrical radial laser array beam incident field propagates in a turbulent atmosphere. The laser array configuration is composed of a number of the ...
  • Transmission of a Bessel beam through a circular aperture in an impedance screen 
    Umul, Yusuf Ziya (IOP Publishing Ltd, 2014-03)
    The scattering effect of a circular aperture, located in an impedance plane, on a Bessel beam is investigated by decomposing the scattered wave into two subcomponents, namely the geometrical optics and diffracted fields. ...
  • Diffraction of waves by a resistive half-plane 
    Umul, Yusuf Ziya (Elsevier Science Bv, 2014-07-15)
    The scattered waves by a resistive half-plane are investigated with defining reflection and transmission coefficients for the diffracted waves. The coefficients are determined according to suitable conditions that are ...
  • Bit error rate analysis of Gaussian, annular Gaussian, cos Gaussian, and cosh Gaussian beams with the help of random phase screens 
    Eyyuboğlu, Halil T. (Optical Soc Amer, 2014-06-10)
    Using the random phase screen approach, we carry out a simulation analysis of the probability of error performance of Gaussian, annular Gaussian, cos Gaussian, and cosh Gaussian beams. In our scenario, these beams are ...