DSpace Repository

Browsing Mühendislik Fakültesi by Author "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği"

Browsing Mühendislik Fakültesi by Author "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği"

Sort by: Order: Results:

  • Fast decodable turbo codes 
    Gazi, Orhan; Yılmaz, Ali Özgür (IEEE-Inst Electrical Electronics Engineers Inc, 2007-02)
    Decoding delay is an important consideration for the use of turbo codes in practical applications. We propose a new structure for turbo codes which is very suitable for parallel decoding. It is shown by union bound analysis ...
  • Fictitious diffracted waves in the diffraction theory of Kirchhoff 
    Umul, Yusuf Ziya (Optical Soc Amer, 2010-01)
    The diffraction theory of Kirchhoff is applied to the semi-infinite aperture of a black half-screen. The derivative of the spherical Green's function is taken into account without any approximation. The uniformly evaluated ...
  • Field correlations of annular beams in extremely strong turbulence 
    Baykal, Yahya; Cai, Yangjian; Ji, Xiaoling (Elsevier Science Bv, 2012-10-01)
    The field correlations of annular beams are formulated when the atmosphere assumes extremely strong turbulence. Thicker and larger ring sized annular beams are found to exhibit larger absolute field correlations. For the ...
  • Field correlations of flat-topped Gaussian and annular beams in turbulence 
    Baykal, Yahya (Elsevier Science Ltd, 2011-05)
    Starting from the second order moment formulation for multi-beam incidence, field correlations at the receiver plane of flat-topped Gaussian and annular beams are found in turbulence. Reflecting the information on both the ...
  • 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 ...
  • Flat topped beams and their characteristics in turbulent media 
    Eyyuboğlu, Halil T.; Arpalı, Çağlar; Baykal, Yahya (Optical Society of America, 2006-05)
    The source and receiver plane characteristics of flat topped (FT) beam propagating in turbulent atmosphere are investigated. To this end, source size, beam power and M(2) factor of source plane FT beam are derived. For a ...
  • Formulation of correlations for general-type beams in atmospheric turbulence 
    Baykal, Yahya (Optical Soc Amer, 2006-04)
    Log-amplitude and phase correlations of general-type beams are formulated in atmospheric turbulence. A general beam is described as the superposition of many sets of multimode contents, each mode being off-axis Hermite-Gaussian. ...
  • Fringe waves in an impedance half-plane 
    Başdemir, Hüsnü Deniz (E M W Publishing, 2013)
    The uniform expressions of scalar fringe waves which are based on the physical theory of diffraction (PTD) were obtained for the impedance half plane in terms of the Fresnel integrals. Asymptotic and uniform forms of the ...
  • Fringe waves in wedge diffraction 
    Umul, Yusuf Ziya (Elsevier GMBH, 2012)
    Explicit expressions for the non-uniform currents of the physical theory of diffraction are derived in terms of Fresnel functions for wedge diffraction by taking into account the surface integrals of the modified theory ...
  • 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 ...
  • Fringe waves radiated by a half-plane for the boundary conditions of Neumann 
    Umul, Yusuf Ziya (Springer, 2008-12)
    The fringe waves of the physical theory of diffraction are obtained in terms of Fresnel integrals for a half-plane satisfying the Neumann boundary condition. The approximate expressions of the radiated waves are also ...
  • General formulation of the edge-diffracted paraxial waves 
    Umul, Yusuf Ziya (Elsevier Science, 2009-09)
    A general formula for edge-diffracted paraxial waves is derived in terms of the Fourier integral transform. It is observed that the scattered paraxial wave can be divided into components of the geometrical optics and ...
  • Generalized beams in ABCDGH systems 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Elsevier Science, 2007-04-01)
    For a generalized beam at the source plane passing through co-located aperture and a propagation path consisting of an off-axis x-y asymmetric ABCDGH system, the receiver plane irradiance expression is derived using the ...
  • Generalized tensor ABCD law for an elliptical Gaussian beam passing through an astigmatic optical system in turbulent atmosphere 
    Cai, Yangjian; Lin, Q.; Eyyuboğlu, Halil T.; Baykal, Yahya (Springer, 2009-02)
    The propagation of an elliptical Gaussian beam (EGB) through an astigmatic ABCD optical system in a turbulent atmosphere is investigated. An analytical formula for the average intensity of an EGB and a generalized tensor ...
  • H(D) -> D(H)+Cu(111) collision system: Molecular dynamics study of surface temperature effects 
    Vurdu, Can D.; Güvenç, Ziya B. (Amer Inst Physics, 2011-04-28)
    All the channels of the reaction dynamics of gas-phase H (or D) atoms with D (or H) atoms adsorbed onto a Cu(111) surface have been studied by quasiclassical constant energy molecular dynamics simulations. The surface is ...
  • Hermite hyperbolic/sinusoidal Gaussian beams in ABCD systems 
    Eyyuboğlu, Halil T. (Elsevier GMBH, 2007)
    For a Hermite hyperbolic/sinusoidal Gaussian beam with focusing properties, passing through an arbitrarily shaped rectangular aperture on the source plane and an on-axis x-y asymmetric ABCD system, the receiver plane ...
  • Hermite-sine-Gaussian and Hermite-sinh-Gaussian laser beams in turbulent atmosphere 
    Eyyuboğlu, Halil T.; Baykal, Yahya (Optical Soc Amer, 2005-12)
    Hermite-sine-Gaussian and Hermite-sinh-Gaussian laser beam intensities in a turbulent atmosphere are investigated. The received intensity is formulated by applying the extended Huygens-Fresnel principle to generalized ...
  • Hierarchical Control With Partial Observations: Sufficient Conditions 
    Boutin, Olivier; Komenda, Jan; Masopust, Tomas; Schmidt, Klaus Werner; Van Schuppen, Jan H. (IEEE, 2011)
    In this paper, hierarchical control of both monolithic and modular discrete-event systems under partial observations is studied. Two new conditions, called observation consistency and local observation consistency, are ...
  • High-throughput screening of large volumes of whole blood using structured illumination and fluorescent on-chip imaging 
    Altay Arpalı, Serap; Arpalı, Çağlar; Coşkun, Ahmet F.; Chiang, Hsin-Hao; Özcan, Aydoğan (Royal Soc Chemistry, 2012)
    Undiluted blood samples are difficult to image in large volumes since blood constitutes a highly absorbing and scattering medium. As a result of this limitation, optical imaging of rare cells (e.g., circulating tumour ...
  • Hybrid Single Walled Carbon Nanotube Fets for High Fidelity Dna Detection 
    Wang, Xu; Özkan, Mihri; Budak, Gürer; Güvenç, Ziya B.; Özkan, Cengiz S. (Springer-Verlag Berlin, 2010)
    A novel application for detecting specific biomolecules using SWNT-ssDNA nanohybrid is described. SWNT-ssDNA hybrid is formed by conjugating amino-ended single strand of DNA (ssDNA) with carboxylic group modified SWNTs ...