Now showing items 21-40 of 48859

    • Conditions that Force an Orthomodular Poset to Be a Boolean Algebra 

      Author: Tkadlec, Josef
      We introduce two new classes of orthomodular posets—the class of weakly Boolean orthomodular posets and the class of orthomodular posets with the property of maximality. The main result of this paper is that the ...
    • Upper Cut-Off Frequency of the Bound Wave and New Leaky Wave on the Slotline 

      Author: Zehentner, Ján; Macháč, Jan; Migliozzi, Maurizio
      (IEEE, 1997-06)
      This paper contributes to a more profound understanding of uniplanar circuit behaviour. A simple closed-form formula providing the upper cut-off frequency of the bound wave propagating over the slotline is presented. A new ...
    • Evolution of New Real and Complex Improper Solutions of the Slotline Dispersion Equation 

      Author: Zehentner, J.; Macháč, J.; Migliozzi, M.
      (IEEE, 1997-09)
      An attempt is made in this paper to reach a better understanding of the behaviour of open uniplanar circuits, particularly the slotline. A new second leaky wave has been revealed in addition to the dominant bound and leaky ...
    • Concrete Quantum Logics with Generalised Compatibiliy 

      Author: Tkadlec, Josef
      We present three results stating when a concrete (= set-representable) quantum logic with covering properties (generalization of compatibility) has to be a Boolean algebra. These results complete and generalize some ...
    • On Combining Classifiers 

      Author: Kittler, Josef; Hatef, Mohamad; Duin, Robert P.W.; Matas, Jiří
      (IEEE, 1998-03)
      We develop a common theoretical framework for combining classifiers which use distinct pattern representations and show that many existing schemes can be considered as special cases of compound classification where all the ...
    • Performance of the slotline in the mm-wave range 

      Author: Zehentner, Ján; Macháč, Jan; Migliozzi, Maurizio
      (IEEE, 1998-05)
      This paper deals with an investigation of the dispersion characteristics of the slotline in the mm-wave range. Attention is paid to the possible excitation of the surface leaky waves on the slotline. Higher order leaky ...
    • Dispersion characteristics of leaky waves on lossless and lossy slotlines 

      Author: Zehentner, Ján; Macháč, Jan; Migliozzi, Maurizio
      (IEEE, 1998-06)
      This paper deals with the dependence of the type of solution of the determinantal slotline dispersion equation on the location of the poles of its matrix elements. A number of possible solutions above the cut-off frequencies ...
    • Fluxgate: Tuned vs. Untuned Output 

      Author: Ripka, Pavel; Billingsley, S.W.
      (IEEE, 1998-07)
      Fluxgate voltage output contains information about the measured DC magnetic field in amplitude of even harmonic components. Tuning the sensor output causes the concentration of output energy to specific harmonics (usually ...
    • Selection of Speaker Independent Feature for a Speaker Verification System 

      Author: Pandit, M.; Kittler, J.; Matas, J.
      (IEEE, 1998-08)
      In this paper we propose an optimisation technique to choose a user independent feature subset from the input feature set for a dynamic time-warping (DTW) based text-dependent speaker verification system. The results ...
    • Hypothesis selection for scene interpretation using grammatical models of scene evolution 

      Author: Young, R.; Kittler, J.; Matas, J.
      (IEEE, 1998-08)
      A major bottleneck in dynamic scene interpretation is the search that is required through a database to find a model that best matches the observed data. We show that the problem can be alleviated if the object model ...
    • Object-Detection With a Varying Number of Eigenspace Projections 

      Author: Reiter, Michael; Matas, Jiří
      (IEEE, 1998-08)
      We present a method allowing a significant speed-up of the eigen-detection method (detection based on principle component analysis). We derive a formula for an upper bound on the class-conditional probability (or equivalently ...
    • Recognition Using Labelled Objects 

      Author: Soh, L. M.; Matas, J.; Kittler, J.
      (IEEE, 1998-08)
      General object recognition is a difficult problem. We (1997) proposed a solution for object recognition in an unconstrained environment. We simplified the recognition problem by attaching a special planar pattern on objects ...
    • Surface leaky waves and their measurement 

      Author: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan; Sarnowski, Marcin K.; Polívka, Jiří
      (IEEE, 1998-10)
      A new approach to experimental identification of surface leaky waves on printed-circuit lines is presented in this paper. Active radiometry is used for field probing even in the near field zone. The measurement is adjusted ...
    • A novel vector network analyzer 

      Author: Hoffmann, Karel; Skvor, Zbyněk
      (IEEE, 1998-12)
      A calibration procedure for a perturbation two-port vector network analyzer is presented. It consists of a variable perturbation two-port placed between a device-under-test and a scalar network analyzer. A measured vector ...
    • The Distributed Oscillator at 4 GHz 

      Author: Divina, Lukáš; Škvor, Zbyněk
      (IEEE, 1998-12)
      This paper describes the design and experimental verification of a tunable oscillator based on a microwave distributed amplifier. The oscillator met design expectations, being capable of continuous tuning over the range ...
    • Progressive Probabilistic Hough Transform for line detection 

      Author: Galambos, C.; Matas, J.; Kittler, J.
      (IEEE, 1999)
      We present a novel Hough Transform algorithm referred to as Progressive Probabilistic Hough Transform (PPHT). Unlike the Probabilistic HT where Standard HT is performed on a pre-selected fraction of input points, PPHT ...
    • Audio-Visual Person Verification 

      Author: Ben-Yacoub, S.; Luttin, J.; Jonsson, K.; Matas, J.; Kittler, J.
      (IEEE, 1999)
      In this paper we investigate benefits of classifier combination (fusion) for a multimodal system for personal identity verification. The system uses frontal face images and speech. We show that a sophisticated fusion ...
    • Spurious leaky mode solutions and experimental verification of the second leaky wave 

      Author: Zehentner, J.; Macháč, J.; Mrkvica, J.; Vacek, P.; Polívka, J.
      (IEEE, 1999)
      This paper presents the revelation of spurious leaky mode solutions of the dispersion equation, and experimental confirmation of the occurrence of the second leaky wave on the slotline. The appearance of the spurious ...
    • Triangular Norms with Continous Daigonals 

      Author: Tkadlec, Josef
      It is an old open question whether a t-norm with a continuous diagonal must be continuous [7]. We give a partial positive answer for t-norms with noncontinuous additive generators (constructed by the technique of [1, ...