Call for partners

[sebastien jehan <sebastien.jehan@libertysurf.fr>]

Objet:
        Bulletin of the Electrotechnical Laboratory Vol. 62, No. 8
(1998)
  la date:
        21 Aug 1999 10:42:05 -0700
     De:
        japancs@cs.arizona.edu (Japan CS Project)
 Soci�t�:
        University of Arizona CS Department, Tucson AZ
 Forums:
        comp.research.japan
 Suivi-A:
        comp.research.japan




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     BULLETIN OF THE ELECTROTECHNICAL LABORATORY VOL. 62, NO. 8 (1998)

          published by

     ELECTROTECHNICAL LABORATORY
          (in Japanese)
-------------------------------------------------------------------------------

[Collection and dissemination of this information supported in part by
ONR Grant
 N00014-97-1-0535.]

[The table of contents of this journal and other Japanese journals
related to
computing are available for anonymous FTP from site ftp.cs.arizona.edu,
directory japan/table.contents. They can also be accessed on the WWW
using URL
<http://www.cs.arizona.edu/japan/www/japan.html>.]


CONTENTS


1       An Automatiic Acquisition of Structural Mathematical
        Morphology Procedures by GA

         Ikushi YODA, Kazuhiko YAMAMOTO, Hiromitsu YAMADA

                This paper presents a method to obtain an image
processing
        procedure by showing an original image and a target image,.
There are
        some preceding works concerning automatic acquisition of image
        processing procedures by combining subroutine packages. In our
        approach, we do not use any image processing subroutine
packages, but
        use only hierarchical mathematical morphology procedures, i.e.,
        erosion and dilation operations. We use genetic algorithms to
search
        procedures. Utilizing a parallel searching function of genetic
        algorithms and introducing a concept of era, we construct
        hierarchical procedures of mathematical morphology.

        key words: Image processing sequence, Learnind, Mathematical,
        Genelit algorithms


13      Extraction of Rotational and Reflectional Partial
        Symmetrical Properties Using Directional Features

         Takeshi MASUDA, Kazuhiko YAMAMOTO, Hiromitsu YAMADA

                Symmetry is a structural shape property that is
important in
        the fields of computer vision and visual psychology. In this
paper we
        consider the extraction of rotational, reflectional and glide
        symmetrical properties of planar 2-D figures. Our approach is
based
        on the use of pattern matching method which uses directional
        features.  This is formulated and implemented by correlation and

        voting method. The method does not require any preliminary
        segmentation, and it can extract the symmetrical property from a

        portion of a shape. The method issuitable for parallel
processing.


21      Development of X-ray Optics for High Power Synchrotron Radiation

         Hiroyuki OYANAGI, Motosada KIRI, Masafumi JINNO, Kageyoshi UENO

         Kokichi HAGA

                We have developed a variable exit beam height
double-crystal
        monochromator for high power insertion devices. The second
crystal is
        mounted on a high-precision XY translational stage and its
position
        in the parallel and perpendicular direction to the reflecting
plane
        (x,y) is computer-controlled. In this design, the parameter
which
        determines exit beam height (y) and geometrically required
        positioning of the second crystal (x) are separately controlled.
A
        systematic noise caused by degraded parallelity between the two
        crystals is significantly reduced by a versatile control of (x,
y):
        for a typical scan (-1 keV) only y is allowed to vary while both

        coordinates are controlled when a monochromator is tuned over a
wider
        energy range. Focusing of X-rays based on adaptive mirror and
        sagittal focusing have been evaluated. A new method of reducing
an
        aberation and better focusing is proposed and the results of ray

        tracing confirmed superior focusing performance. The focusing
        performance was also studied for sagittal bending and a
prototype of
        a four-point bending apparatus has been built.

        key words: insertion device, wiggler, XAFS, double-crystal
        monochromator, sagittal focusing, adaptive mirror


35      Negative Thermal Quenching Curves in Photoluminescence of Solids

         Hajime SHIBATA

                We have derived an analytical formula for the
temperature
        dependence of the photoluminescence (PL) intensity when the
        "negative" thermal quenching phenomenon is observed. The formula
was
        examined using available experimental data for GaAs and ZnS, and
the
        agreement of the results was quite good. It was confirmed
        quantitatively that the principal mechanism of negative thermal
        quenching is the thermal excitation of electrons to the initial
state
        of the PL transition from the eigenstates with smaller energy
        eigenvalues. In addition, it was revealed that the real
activation
        energy for the nonradiative recombination processes is given by
when
        the negative thermal quenching phenomenon is observed, where is
the
        activation energy estimated simply from the apparent slope in
the
        experimental data, and is the activation energy for the negative

        thermal quenching phenomenon.