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Browsing Mühendislik Fakültesi by Issue Date

Browsing Mühendislik Fakültesi by Issue Date

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  • Equivalent functions for the Fresnel integral 
    Umul, Yusuf Ziya (Optical Soc Amer, 2005-10-17)
    Fresnel integral is modeled with three equivalent functions. The first function is derived by considering the sum of the first term of the Fresnel integral's asymptotic expansion {(F) over cap (x)} and an exponential ...
  • Human face identification using M-PCA augmented with Gabor Wavelet 
    Karaömeroǧlu, Betül; Hassanpour, Reza (2005-11)
    In this paper, a specialized version of PCA augmented with Gabor Wavelet Transform is proposed for face identification. Firstly, to cope with the variations due to illumination and facial expression changes 2D Gabor Wavelet ...
  • Structures and melting of AgN (N = 7, 12–14) clusters 
    Atış, Murat; Aktaş, Hüseyin; Güvenç, Ziya B. (IOP Publishing ltd, 2005-12)
    We have studied the most stable structures of Ag-N (N = 7, 12, 13, 14) clusters and investigated their binding energies and melting behaviours using molecular dynamics and thermal quenching methods based on the Voter-Chen ...
  • Ammonia removal from anaerobically digested dairy manure by struvite precipitation 
    Uludağ Demirer, Sibel; Demirer, G. N.; Chen, S. (Elsevier Science LTD, 2005-12)
    Ammonia is one of the most important contaminants impairing the quality of water resources. When this is considered along with the fact that the global demand for nitrogenous fertilizers is in constant rise, the need for ...
  • 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 ...
  • Marjinal Analiz Yoluyla Güvenilirlik Optimizasyonu 
    Yüceer, Ümit (2005-12-15)
    Marjinal analizin güvenilirlik redandansı optimizasyonuna bir uyarlaması anlatılmaktadır. Amaç fonksiyonu ayrışık hale dönüştürülüp, konkav olduğu gösterilecek ve marjinal analiz metodunun çok seri ve hızlı bir şekilde, ...
  • Beams with arbitrary field profiles in turbulence - art. no. 652209 
    Baykal, Yahya (Spie-Int Soc Optical Engineering, 2006)
    Characteristics of optical beam incidences that have arbitrary field profiles are examined when they propagate in the turbulent atmosphere. Arbitrary source field profile is introduced by decomposing the source into ...
  • Intensity fluctuations for source arrays in turbulent atmosphere - art. no. 630308 
    Baykal, Yahya (Spie-Int Soc Optical Engineering, 2006)
    Intensity fluctuations are formulated for source arrays in weakly turbulent horizontal atmospheric links. Source array is composed of point sources separated by variable distances in the transverse source directions. Formula ...
  • An approach to discrete convexity and its use in an optimal fleet mix problem 
    Cambini, Riccardo; Riccardi, Rossana; Yüceer, Ümit (Springer-Verlag Berlin, 2006)
    A notion of convexity for discrete functions is first introduced, with the aim to guarantee both the increasing monotonicity of marginal increments and the convexity of the sum of convex functions. Global optimality of ...
  • Approaches on the selection of web cameras and calibration targets for stereo vision 
    Eren, Hüseyin; Çelik, Ümit; Poyraz, Mustafa (IEEE, 2006)
    In this paper, it is studied on the calibration by using specified web cameras. The performance of 3D computer vision depends on the accuracy of camera parameters. Therefore, camera calibration is very crucial in stereo ...
  • Relative consistency of projective reconstructions obtained from the same image pair 
    Otlu, Burçak; Atalay, Mehmet Volkan; Hassanpour, Reza (World Scientific, 2006)
    This study obtains projective reconstructions of an object or a scene from its image pair and measures relative consistency of these projective reconstructions. 3D points are estimated from an image pair using projective ...
  • Recent challenges in video coding and streaming 
    Choupani, Roya; Tolun, Mehmet R. (2006)
    Video streaming over the Internet has gained popularity during the recent years which is mainly the result of the introduction of video-conferencing and videotelephony. These in turn have made it possible to bring to life ...
  • Strategy creation, decomposition and distribution in particle navigation 
    Beldek, Ulaş; Leblebicioğlu, Kemal (Elsevier, 2006)
    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 ...
  • Comparison of globoid and cylindrical shearer drums' loading performance 
    Ayhan, Mustafa; Eyyuboğlu, E. Mustafa (South African Inst Mining Metallurgy, 2006-01)
    Drums of a modern longwall shearer are manufactured to include various constructional features conveying extracted material onto the face conveyor as efficiently as possible. Designing a drum with a conical shell or with ...
  • The equivalence of discrete convexity and the classical definition of convexity 
    Yüceer, Ümit (2006-01)
    This article presents a proof of the fact that the classical definition of convexity of nondecreasing (increasing) first forward differences for discrete univariate functions is actually a special case of the concept of ...
  • Scintillation index of flat-topped Gaussian beams 
    Baykal, Yahya; Eyyuboğlu, Halil T. (Optical Soc Amer, 2006-01-01)
    The scintillation index is formulated for a flat-topped Gaussian beam source in atmospheric turbulence. The variations of the on-axis scintillations at the receiver plane are evaluated versus the link length, the size of ...
  • Modified theory of the physical-optics approach to the impedance wedge problem 
    Umul, Yusuf Ziya (Optical Soc Amer, 2006-02-01)
    The problem of a wedge with equal face impedances is examined with a modified theory of physical optics. The surface integral is constructed by use of the impedance boundary condition. The aperture equivalent current is ...
  • Propagation characteristics of higher-order annular Gaussian beams in atmospheric turbulence 
    Eyyuboğlu, Halil T.; Altay Arpalı, Serap; Baykal, Yahya (Elsevier Science, 2006-02-15)
    The propagation characteristics of higher-order annular Gaussian (HOAG) beams in turbulence are investigated. From a HOAG source plane excitation, the average intensity of the receiver plane is developed analytically. This ...
  • Higher order annular Gaussian laser beam propagation in free space (vol 45, art no 038002, 2006) 
    Eyyuboğlu, Halil T.; Yenice, Y. E.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2006-03)
    Propagation of higher order annular Gaussian (HOAG) laser beams in free space is examined. HOAG beams are defined as the difference of two Hermite-Gaussian (HG) beams; thus, they can be produced by subtracting a smaller ...
  • Thermodynamics of small platinum clusters 
    Sebetçi, Ali; Güvenç, Ziya B.; Kökten, Hatice (Elsevier Science, 2006-03)
    Using the Voter and Chen version of an embedded atom model, derived by fitting simultaneously to experimental data of both the diatomic molecule and bulk platinum, we have studied the melting behavior of free, small platinum ...