Now showing items 1-20 of 45

    • Accurate simulation of reflector antennas by the complex source-dual series approach 

      Oğuzer, T.; Altıntaş, A.; Nosich, A. I. (Institute of Electrical and Electronics Engineers, 1995-08)
      The radiation from circular cylindrical reflector antennas is treated in an accurate manner for both polarizations. The problem is first formulated in terms of the dual series equations and then is regularized by the ...
    • Active pixel merging on hypercube multicomputers 

      Kurç, Tahsin M.; Aykanat, Cevdet; Özgüç, Bülent (Springer, Berlin, Heidelberg, 1996)
      This paper presents algorithms developed for pixel merging phase of object-space parallel polygon rendering on hypercube-connected multicomputers. These algorithms reduce volume of communication in pixel merging phase by ...
    • Circular-planned diagrid systems and an interrelated technique using planar elements 

      Kinayoğlu, Gökhan; Şenyapılı, Burcu (Birkhaeuser Science, 2018)
      This paper presents the development of circular-planned diagrid systems in architecture and varying approaches in patents in relation to these developments, together with a technique introduced for producing diagrid ...
    • Closed-form Green's functions for general sources and stratified media 

      Dural, G.; Aksun, M. I. (Institute of Electrical and Electronics Engineers, 1995-07)
      The closed-form Green's functions of the vector and scalar potentials in the spatial domain are presented for the sources of horizontal electric, magnetic, and vertical electric, magnetic dipoles embedded in general, ...
    • Combined-field solution of composite geometries involving open and closed conducting surfaces 

      Ergül, Özgür; Gürel, Levent (IEEE, 2005-04)
      Combined-field integral equation (CFIE) is modified and generalized to formulate the electromagnetic problems of composite geometries involving both open and closed conducting surfaces. These problems are customarily ...
    • Comparative evaluation of absorbing boundary conditions using Green's functions for layered media 

      Aksun, M. İrşadi; Dural, G. (Institute of Electrical and Electronics Engineers, 1996-02)
      Absorbing boundary conditions are comparatively studied using the Green's functions of the vector and scalar potentials for multilayer geometries and general sources. Since the absorbing boundaries are introduced as ...
    • Comparative study of acceleration techniques for integrals and series in electromagnetic problems 

      Kinayman, Noyan; Aksun, M. I. (IEEE, 1995-06)
      Most of the electromagnetic problems can be reduced down to either integrating oscillatory integrals or summing up complex series. However, limits of the integrals and the series usually extend to infinity. In addition, ...
    • Design and determination of stator geometry for axial flux permanent magnet free rod rotor synchronous motor 

      Kalender O.; Ege, Y.; Nazlibilek, S. (2011)
      During designing a new axial flux permanent magnet free rod rotor synchronous motor, it is important to know before hand in which phase the largest angular velocity can occur, what is the ways to reduce the power consumption, ...
    • Effect of cross-sectional geometry on the RPA plasmons of quantum wires 

      Bennett, C. R.; Tanatar, Bilal; Constantinou, N. C.; Babiker, M. (Pergamon Press, 1994)
      The effect of cross-sectional geometry on both the intrasubband plasmon and intersubband plasmon of a quantum wire is investigated within a two-subband RPA scheme. Exact analytical electronic wavefunctions for circular, ...
    • Efficient use of closed-form Green's functions for three-dimensional problems involving multilayered media 

      Aksun, M. Irsadi; Mittra, R. (IEEE, 1994-06)
      With the use of casting the spatial domain Green's functions into closed forms approach, it was demonstrated that the computational efficiency of the method of moments (MoM) for the solution of the mixed potential integral ...
    • European collaboration in conformal antenna research 

      Sipus, Z.; Persson P.; Lanne, M.; Heckler, M.; Maci, S.; Campos, J. L. M.; Knott, P.; Ertürk, Vakur; Vandenbosch, G. (IEEE, 2007-09)
      The work carried out within Work Package 2.4-3 of the EU network "Antenna Centre of Excellence" (ACE) is presented in this paper. This work package is concerned with structuring research on conformal antennas. In more ...
    • Evolution of the Hofstadter butterfly in a tunable optical lattice 

      Yllmaz, F.; Ünal, F. N.; Oktel, M. O. (American Physical Society, 2015)
      Recent advances in realizing artificial gauge fields on optical lattices promise experimental detection of topologically nontrivial energy spectra. Self-similar fractal energy structures generally known as Hofstadter ...
    • Examining the annealing schedules for RNA design algorithm 

      Erhan, H. E.; Sav, Sinem; Kalashnikov, S.; Tsang, H. H. (IEEE, 2016-07)
      RNA structures are important for many biological processes in the cell. One important function of RNA are as catalytic elements. Ribozymes are RNA sequences that fold to form active structures that catalyze important ...
    • Extraction of target features using infrared intensity signals 

      Aytaç, Tayfun; Barshan, Billur (IEEE, 2005-09)
      We propose the use of angular intensity signals obtained with low-cost infrared (IR) sensors and present an algorithm to simultaneously extract the geometry and surface properties of commonly encountered features or targets ...
    • Finite element modeling of micro-particle separation using ultrasonic standing waves 

      Büyükkoçak, S.; Çetin, Barbaros; Özer, M. B. (ASME, 2014)
      Acoustophoresis which means separation of particles and cells using acoustic waves is becoming an intensive research subject. The method is based on inducing an ultrasonic compression standing wave inside a microchannel. ...
    • Fitting matrix geometric distributions by model reduction 

      Akar, N. (Taylor and Francis Inc., 2015)
      A novel algorithmic method is proposed to fit matrix geometric distributions of desired order to empirical data or arbitrary discrete distributions. The proposed method effectively combines two existing approaches from two ...
    • Fresnel lamb wave and V-groove lenses with tunable mode selectivity 

      Yaralıoğlu, Göksen Göksenin; Atalar, Abdullah; Köymen, Hayrettin (IEEE, 1995)
      The Lamb wave and V-groove lenses are distinguished by their high surface wave excitation efficiencies. However, due to the fixed incidence angle, a particular lens can only be used for materials having surface wave ...
    • Gate bias characterization of CNT-TFT DNA sensors 

      Aktaş, Özgür; Töral, Taylan (IEEE, 2009-12)
      This paper follows the approach in the works of Gui et al. (2007), that use the change in the current of carbon nanotube thin film transistors (CNT-TFT) with DNA attachment and DNA hybridization. The authors have studied ...
    • The geometry of sheaves on sites 

      Parsizadeh, Pejman (Bilkent University, 2021-01)
      In this work, we study doing geometry on sheaves on sites. Categories of our sites consist of objects that are building blocks for a given geometry. Generalized spaces then will be sheaves on these sort of sites. Next we ...
    • A graph based approach for naming faces in news photos 

      Ozkan, D.; Duygulu, P. (I E E E Computer Society, 2006)
      We propose a method to associate names and faces for querying people in large news photo collections. On the assumption that a person's face is likely to appear when his/her name is mentioned in the caption, first all the ...