Now showing items 21-40 of 2195

    • 3D human pose search using oriented cylinders 

      Pehlivan, S.; Duygulu P. (2009)
      In this study, we present a representation based on a new 3D search technique for volumetric human poses which is then used to recognize actions in three dimensional video sequences. We generate a set of cylinder like 3D ...
    • 3D model compression using connectivity-guided adaptive lifting transform 

      Köse K.; Çetin, A. E.; Güdükbay U.; Onural, L. (2007)
      Two compression frameworks that are based on a Set Partitioning In Hierarchical Trees (SPIHT) and JPEG2000 methods are proposed. The 3D mesh is first transformed to 2D images on a regular grid structure. Then, this image-like ...
    • 3d modeling of on-chip acoustophoretic particle manipulation in a polymer microfluidic device 

      Çaǧatay E.; Özer M.B.; Çetin B. (Chemical and Biological Microsystems Society, 2016)
      This study focuses on understanding of the sensitivities of the acoustophoretic process on uncertainties/errors in the geometric properties of the chip material and the piezoelectric actuators. The sensitivity of the ...
    • 3D printed microfluidic reactor for high throuhput chitosan nanoparticle synthesis 

      Aşik M.D.; Çetin B.; Kaplan M.; Erdem Y.; Saǧlam N. (Chemical and Biological Microsystems Society, 2016)
      The major bottleneck for the commercialization of nanoparticle related technologies is the mass production of the nanoparticles. One approach to overcome this bottleneck is use of microfluidic devices. In this paper, a 3D ...
    • 3D thumbnails for mobile media browser interface with autostereoscopic displays 

      Gundogdu, R.B.; Yigit, Y.; Capin, T. (2009)
      In this paper, we focus on the problem of how to visualize and browse 3D videos and 3D images in a media browser application, running on a 3D-enabled mobile device with an autostereoscopic display. We propose a 3D thumbnail ...
    • 4,8 T/m manyetik parçacık görüntüleme tarayıcı tasarımı ve yapımı 

      Ütkür, M.; Muslu, Y.; Sarıtaş, E. Ü. (Institute of Electrical and Electronics Engineers, 2018)
      Manyetik Parçacık Görüntüleme (MPG), ilk yayımlandığı 2005 yılından bu yana hızla gelişerek anjiyografi, kök hücre takibi ve kanser görüntüleme gibi uygulama alanlarında ciddi ilerlemeler kaydetmiştir. İyonlaştırıcı ışıma ...
    • 45 GHz bandwidth-efficiency resonant cavity enhanced ITO-Schottky photodiodes 

      Biyikli, N.; Kimukin, I.; Aytur, O.; Ozbay, E.; Gokkavas, M.; Unlu, M. S. (Optical Society of America, 2001)
      We demonstrated high-performance resonant cavity enhanced ITO-Schottky photodiodes. We achieved a peak efficiency of 75% around 820 nm with a 3-dB bandwidth of 60 GHz resulting in a bandwidth-efficiency product of 45 GHz.
    • 50-W, 1.6-GHz pulse repetition rate from a burst-mode Yb-doped fiber laser 

      Elahi P.; Ertek A.C.; Eken K.; Ömer Ilday F. (Institute of Electrical and Electronics Engineers Inc., 2017)
      We report a 50-W average power Yb-doped fiber laser amplifier system. The laser system produces bursts at a minimum rate of 200 kHz, with 1.6 GHz intraburst repetition rate. The total energy delivers in a burst is 250 μJ ...
    • A 60 GHz beam-steering reconfigurable antenna 

      Khalat, A.; Towfiq, Md. A.; Cetiner, B. A.; Ceylan, Ö.; Biyikli, N. (Institute of Electrical and Electronics Engineers Inc., 2016)
      We present the design, microfabrication, and characterization of a multifunctional reconfigurable antenna (MRA) with beam steering capability operating at 60 GHz band (59-66 GHz). The MRA provides 3 different beam directions ...
    • 83 W, 1 ns, 3.1 MHz all-fiber laser for micromachining 

      Özgören, K.; Oktem, B.; Yilmaz, S.; Ömer Ilday F.; Pasin, E.; Eken, K. (2011)
      Fiber lasers are commonly used for various material processing applications. The advantages (such as simplicity of the system, high material removal rate) and disadvantages (larger heat-affected zone, reduced precision) ...
    • Ab initio modeling of elastic and optical properties of Sb and Bi sesquioxides 

      Koc, H.; Akhundov, C. G.; Mamedov, A. M.; Ozbay, E. (Institute of Physics Publishing, 2018)
      First-principle calculations performed the structural, mechanical, electronic, and optical properties of Sb2O3 and Bi2O3 compounds in monoclinic (claudetite and α-Bi2O3) and orthorhombic (valentinite) structures. Local ...
    • ABC: A Double-Conversion Compiler / Solver For Nanoscience Calculus 

      Kulik, I. O. (2003)
      "CompLab" ("Compiler Laboratory") or "ABC" ("Advanced Basic-C") is a double conversion compiler working in two parallel regimes (A and B) one of which is similar to that of MATLAB while the other is a professional compilation ...
    • Ablation-cooled material removal at high speed with femtosecond pulse bursts 

      Kerse, C.; Kalaycioglu H.; Elahi P.; Akcaalan Ö.; Yavaş, S.; Aşik, M.D.; Kesim, D.K.; Yavuz, K.; Çetin, B.; Ilday F.Ö. (Optical Society of America (OSA), 2015)
      We report exploitation of ablation cooling, a concept well-known in rocket design, to remove materials, including metals, silicon, hard and soft tissue. Exciting possibilities include ablation using sub-microjoule pulses ...
    • About the Wigner distribution of a graded index medium and the fractional fourier transform operation 

      Ozaktas, H. M.; Mendlovic, D.; Lohmann, A. W. (S P I E - International Society for Optical Engineering, 1993)
      Upon propagation through quadratic graded index media, the Wigner distribution of the wavefunction of light rotates uniformly. As a consequence, a definition of fractional Fourier transforms based on rotating the functions ...
    • Accuracy and efficiency considerations in the solution of extremely large electromagnetics problems 

      Gürel, L.; Ergül O. (2011)
      This study considers fast and accurate solutions of extremely large electromagnetics problems. Surface formulations of large-scale objects lead to dense matrix equations involving millions of unknowns. Thanks to recent ...
    • Accuracy: The Frequently Overlooked Parameter in the Solution of Extremely Large Problems 

      Ergul, O.; Gurel, L. (2011)
      We investigate error sources and their effects on the accuracy of solutions of extremely large electromagnetics problems with parallel implementations of the multilevel fast multipole algorithm (MLFMA). Accuracy parameters ...
    • Accurate modeling of metamaterials with MLFMA 

      Ergül Ö.; Ünal, A.; Gürel, L. (2006)
      Electromagnetic modelling of large metamaterial (MM) structures employing multilevel fast multipole algorithm (MLFMA) is reported. MMs are usually constructed by periodically embedding unit cells, such as split-ring ...
    • Accurate plane-wave excitation in the FDTD method 

      Gürel, L.; Oğuz, U.; Arikan, O. (IEEE, Piscataway, NJ, United States, 1997)
      Different techniques are developed to implement plane-wave excitation on the finite-difference time-domain (FDTD) method, such as the initial-condition, the hard-source, and the connecting-condition techniques, for the ...
    • Accurate solutions of scattering problems involving low-contrast dielectric objects with surface integral equations 

      Ergül Ö.; Gürel, L. (2007)
      We present the stabilization of the surface integral equations for accurate solutions of scattering problems involving low-contrast dielectric objects. Unlike volume formulations, conventional surface formulations fail to ...
    • Achieving inclusion in public spaces: A shopping mall case study 

      Afacan, Y. (Springer-Verlag London Ltd, 2012)
      [No abstract available]