Now showing items 1-20 of 5691

    • Focusing surface waves using an axicon 

      Koymen, H.; Atalar, Abdullah (A I P Publishing, 1985-12)
      Axicons are generators of waves which focus on a line. They are used in various imaging and nondestructive testing applications as bulk wave focusing devices with a very long depth of focus. In this letter, a new type of ...
    • Generation of focused surface waves with a solid wedge 

      Atalar, Abdullah; Köymen, Hayrettin (IEEE, 1987)
      Focusing of surface acoustic waves on material surfaces was achieved by axicons in liquid immersion. The system consisted of a plane acoustic wave generator obliquely insonifying a cylindrical mirror placed perpendicularly ...
    • Modelling and control of a wind energy conversion system 

      Saribatir, B. M.; Sezer, M. E. (Taylor & Francis, 1987)
      The dynamical model of a novel low power wind energy conversion system consisting of a wind turbine, an induction generator, a PWM a.c. inverter and a d.c. battery group is obtained. A feedback control law is developed to ...
    • Digital decoding of in-line holograms 

      Onural, L.; Scott, P. D. (SPIE, 1987)
      Digitally sampled in-line holograms may be linearly filtered to reconstruct a representation of the original object distribution, thereby decoding the information contained in the hologram. The decoding process is performed ...
    • An Input/Output control system for the dynamic job shop 

      Onur, L.; Fabrycky, W. J. (Taylor & Francis, 1987)
      A combined input/output control system is presented for periodically determining the set of jobs to be released (input variables) and the capacities of processing centers (output variables) in the dynamic job shop, so that ...
    • Increasing the sensitivity of the scanning acoustic microscope to anisotropy 

      Atalar, Abdullah (IEEE, 1987)
      The response of the scanning acoustic microscope to anisotropic materials is theoretically investigated. For this purpose, the reflection coefficient of plane acoustic waves incident on a liquid-anisotropic-solid interface ...
    • Measurement of sensitivity of different wave modes to subsurface defects 

      Atalar, Abdullah; Köymen, Hayrettin; Yemişçiler, O. (IEEE, 1988)
      Excitation of acoustic wave modes in a layered solid is investigated when the solid is immersed in a liquid. This is done by computing the reflection coefficient of acoustic plane waves at the liquid-layered-solid interface. ...
    • Continuous processing of images through user sketched functional blocks 

      Kaya, A.; Ozguc, B. (Wiley-Blackwell, 1988)
      Our aim is to implement an image processing system with previously defined algorithms through the use of functional blocks connected together to form a diagram that we call a schematic. A functional block means the ...
    • A fast method of calculating diffraction loss between two facing transducers 

      Atalar, Abdullah (IEEE, 1988)
      A fast method of calculating the diffraction loss between two facing circular ultrasonic transducers of unequal size is presented. This problem is directly applicable for minimization of diffraction loss in acoustic lens ...
    • A transportation type aggregate production model with bounds on inventory and backordering 

      Erenguc, S. S.; Tufekci, S. (Elsevier, 1988)
      We consider a certain T period aggregate production planning model, where the two sources of production are regular and overtime. The model allows for time varying production, holding and backordering costs and includes ...
    • Seabed propagation of ULF/ELF electromagnetic fields from harmonic dipole sources located on the seafloor 

      Fraser-Smith, A. C.; lnan, A. S.; Villard, O. G.; Joiner, R. G. (Wiley-Blackwell Publishing, 1988)
      he amplitudes of the quasi-static electromagnetic fields generated at points on the seafloor by harmonic dipole sources (vertically directed magnetic dipoles, horizontally directed magnetic dipoles, vertically directed ...
    • Iterative algorithms for solution of large sparse systems of linear equations on hypercubes 

      Aykanat, C.; Özgüner, F.; Ercal, F.; Sadayappan, P. (IEEE, 1988)
      Finite-element discretization produces linear equations in the form Ax=b, where A is large, sparse, and banded with proper ordering of the variables x. The solution of such equations on distributed-memory message-passing ...
    • An algorithmic proof of the polyhedral decomposition theorem 

      Akgül, M. (John Wiley & Sons, 1988)
      It is well‐known that any point in a convex polyhedron P can be written as the sum of a convex combination of extreme points of P and a non‐negative linear combination of extreme rays of P. Grötschel, Lovász, and Schrijver ...
    • A sequential dual simplex algorithm for the linear assignment problem 

      Akgül, M. (Elsevier, 1988)
      We present a sequential dual-simplex algorithm for the linear problem which has the same complexity as the algorithms of Balinski [3,4] and Goldfarb [8]: O(n2) pivots, O(n2 log n + nm) time. Our algorithm works with the ...
    • Coding method for discrete noiseless channels with input constraints 

      Arıkan, Erdal (IEEE, 1988)
      Summary form only given. Two coding algorithms for discrete noiseless channels with input constraints have been analyzed. The first algorithm, which requires infinite-precision arithmetic and is mainly of theoretical ...
    • An Upper Bound on the Cutoff Rate of Sequential Decoding 

      Arikan, E. (1988)
      An upper bound is given on the cutoff rate of discrete memoryless channels. This upper bound, which coincides with a known lower bound, determines the cutoff rate, and settles a long-standing open problem. © 1988 IEEE
    • Sequential decoding for multiple access channels 

      Arıkan, E. (Institute of Electrical and Electronics Engineers, 1988)
      The use of sequential decoding in multiple access channels is considered. The Fano metric, which achieves all achievable rates in the one-user case, fails to do so in the multiuser case. A new metric is introduced and an ...
    • A simple animation package 

      Coşar, A.; Özgüç, B. (Pergamon Press, 1988)
      This paper discusses a simple animation package that animates sketches drawn by the user through a simple set of operations. The purpose of the animation package is to demonstrate various computer graphics principles to ...
    • A heuristic procedure for a single-item dynamic lot sizing problem 

      Benli, O. S.; Sabuncuoglu, I.; Tufekci, S. (Pergamon Press, 1988)
      An O(T) heuristic proceudre for a single-item dynamic lot sizing problem is introduced in this paper. The algorithm tries to establish the regeneration points of the problem whether either the production or the beginning ...
    • Robust stability of discrete systems 

      Sezer, M. E.; Šiljak, D. D. (Taylor & Francis, 1988-01)
      The objective of this paper is to show how to choose a Liapunov function to obtain the best and sometimes exact estimates of the degree of exponential stability for linear time-invariant discrete systems. The choice is ...