Concept

Rotations in 4-dimensional Euclidean space

Related publications (42)

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wannier90: A tool for obtaining maximally-localised Wannier functions

Nicola Marzari

We present wannier90, a program for calculating maximally-localised Wannier functions (MLWF) from a set of Bloch energy bands that may or may not be attached to or mixed with other bands. The formalism works by minimising the total spread of the MLWF in re ...

2008

VLSI implementation of a high-speed iterative sorted MMSE QR decomposition

Andreas Peter Burg

The QR decomposition is an important, but often underestimated prerequisite for pseudo- or non-linear detection methods such as successive interference cancellation or sphere decoding for multiple-input multiple-output (MIMO) systems. The ability of concur ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2007

Soft-output sphere decoding: Performanceand implementation aspects

Andreas Peter Burg, Christoph Studer

Multiple-input multiple-output (MIMO) detection algorithms providing soft information for a subsequent channel decoder pose significant implementation challenges due to their high computational complexity. In this paper, we show how sphere decoding can be ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2006

Calibration of the 6 DOF High-Precision Flexure Parallel Robot "Sigma 6"

Reymond Clavel, Emanuele Lubrano

In this paper, we present a new method for calibrating a 6 degree-of-freedom (DOF) high-precision flexure parallel robot. The innovative contributions of this work are either in the technological challenge of calibrating a 6 DOF robot with sub-micrometer a ...

Fraunhofer2006

Actionneur à deux degrés de liberté pour micro robot mobile

Reymond Clavel, Walter Driesen

Ce projet présente un actionneur à deux degrés de liberté (mouvement verticale et rotation) pour des micro-robots mobiles. L’actionneur possède un encombrement de 12 x 10.4 x 3 mm3 et une course de 5.5 mm. L’actionnement est basé sur le principe du stick-s ...

2005

Variational reconstruction of scalar and vector images from non-uniform samples

Muthuvel Arigovindan

We address the problem of reconstructing scalar and vector functions from non-uniform data. The reconstruction problem is formulated as a minimization problem where the cost is a weighted sum of two terms. The first data term is the quadratic measure of go ...

EPFL2005

Sensor array calibration via tracking with the extended Kalman filter

Volkan Cevher

Starting with a randomly distributed sensor array with unknown sensor orientations, array calibration is needed before target localization and tracking can be performed using classical triangulation methods. In this paper, we assume that the sensors are on ...

2001

Interaction of D-branes on orbifolds and massless particle emission

Claudio Scrucca

We discuss various D-brane configurations in 4-dimensional orbifold compactifications of type II superstring theory which are point-like 0-branes from the 4-dimensional space-time point of view. We analyze their interactions and compute the amplitude for t ...

World Scientific Publ Co Inc, 687 Hartwell St, Teaneck, Nj 07666 Usa1998

Method and Apparatus for Generating Halftone Images by Discrete One-to-one Dither Tile Rotation

Roger Hersch

The invention relates to a method and apparatus for automatic high-speed generation of digital angled halftone screens, specially suited for obtaining screens approximating the irrational angles which are generally required by high-quality colour reproduct ...

1995

A look-ahead block Schur algorithm for Toeplitz-like matrices

Ali H. Sayed

We derive a look-ahead recursive algorithm for the block triangular factorization of Toeplitz-like matrices. The derivation is based on combining the block Schur/Gauss reduction procedure with displacement structure and leads to an efficient block-Schur co ...

Society for Industrial and Applied Mathematics1995