Results 281 to 290 of about 5,706,267 (307)

READER'S FORUM. [PDF]

Korean J Orthod
Ahn HW.
europepmc   +1 more source

Some of the next articles are maybe not open access.

Related searches:

A wavelet transform with point-symmetric extension at tile boundaries

IEEE Transactions on Image Processing, 2002
This paper presents a low-complexity wavelet transform that utilizes point-symmetric extension at the image tile boundaries. The proposed approach is considered as an alternative to the well-known symmetric signal extension in dealing with the boundary artifacts that manifest when tiles of images are lossy compressed. The new solution developed for odd-
Igor, Kharitonenko, Xing, Zhang, Sue, Twelves   +2 more
openaire   +3 more sources

Optimal navigation in a planar time-varying point-symmetric flow-field

IEEE Conference on Decision and Control and European Control Conference, 2011
This paper is concerned with time-optimal navigation for flight vehicles in a planar, time-varying point-symmetric flow-field — such as inside vortices or regions of eddy-driven upwelling/downwelling—where the objective is to find the fastest trajectory between initial and final points.
L. Techy
openaire   +2 more sources

Two-point symmetrization and convexity

Archiv der Mathematik, 2004
For a hyperplane \(H\) in \(\mathbb{R}^n\), let \(\sigma_H\) denote the reflection in \(H\), and let \(H^-\), \(H^+\) be the two closed halfspaces bounded by \(H\). The two-point-symmetrization with respect to \(H\) transforms a set \(A\subset \mathbb{R}^n\) into the set \[ ((A\cap \sigma_H A)\cap H^-)\cup((A\cup (\sigma_H A)\cap H^+).
Aubrun, Guillaume, Fradelizi, Matthieu
openaire   +1 more source

Decomposition of Bivariate Point-Symmetric Density Function

Calcutta Statistical Association Bulletin, 1998
For the analysis of contigency tables, it is known that the point-symmetry model holds if and only if both the quasi-point symmetry and the marginal point-symmetry models hold (Tomizawa, 1985). This paper shows that a similar decomposition for bivariate density function (instead of cell probabilities) holds.
Tomizawa, Sadao, Konuma, Tomono
openaire   +1 more source

A Point-Symmetric Graph that is Nowhere Reversible

SIAM Journal on Algebraic Discrete Methods, 1982
It is the purpose of this note to investigate the relationships among four concepts relating to symmetry in graphs: point-symmetry, line-symmetry, arc-symmetry and reversibility; especially which of the first three properties do not imply reversibility.
Harary, Frank, Vince, Andrew, Worley, Dale   +2 more
openaire   +2 more sources

Polychromatic MTF of electrostatic point symmetric electron lenses

Applied Optics, 1983
Electrostatic electron lenses have been evaluated in terms of their image transfer characteristics. The effect of polychromatic radiation with different spectral energy distributions on the performance of an electron emitter-lens combination has been studied.
O P, Nijhawan, S K, Gupta, R, Hradaynath
openaire   +2 more sources

Glide-Symmetric Holey Leaky-Wave Antenna With Low Dispersion for 60 GHz Point-to-Point Communications

IEEE Transactions on Antennas and Propagation, 2020
In this article, two novel efficient leaky-wave antennas (LWAs) with stable radiation patterns operating in the 60 GHz band are proposed. The LWAs are implemented in groove-gap waveguide (GGW) technology. To mitigate the beam squint due to the dispersive
Qiao Chen, O. Zetterstrom, E. Pucci, Á. Palomares‐Caballero, P. Padilla, O. Quevedo–Teruel   +5 more
semanticscholar   +1 more source