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The decimation-Hadamard transform of two-level autocorrelation sequences

by Guang Gong, Solomon W. Golomb - IEEE Trans. Inform. Theory , 2002
"... Abstract—A new method to study and search for two-level autocorrelation sequences for both binary and nonbinary cases is developed. This method iteratively applies two operations: deci-mation and the Hadamard transform based on general orthogonal functions, referred to as the decimation-Hadamard tra ..."
Abstract - Cited by 7 (7 self) - Add to MetaCart
Abstract—A new method to study and search for two-level autocorrelation sequences for both binary and nonbinary cases is developed. This method iteratively applies two operations: deci-mation and the Hadamard transform based on general orthogonal functions, referred to as the decimation

New Ternary and Quaternary Sequences with Two-Level Autocorrelation

by Honggang Hu, Guang Gong
"... Pseudorandom sequences with good correlation properties are widely used in communications and cryptography. The search of new sequences with two-level autocorrelation has been a very interesting problem for decades. In 2002, Gong and Golomb proposed the iterative decimation-Hadamard transform (DHT) ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
Pseudorandom sequences with good correlation properties are widely used in communications and cryptography. The search of new sequences with two-level autocorrelation has been a very interesting problem for decades. In 2002, Gong and Golomb proposed the iterative decimation-Hadamard transform (DHT

Realizations of Decimation Hadamard Transform for Special Classes of Binary Sequences with Two-level Autocorrelation

by Nam Yul Yu, Guang Gong
"... In an effort to search for a new binary two-level autocorrelation sequence, the decimation-Hadamard transform (DHT) based on special classes of known binary sequences with two-level autocorrelation is investigated. It is theoretically proved that some realizations of a binary generalized Gordon-Mill ..."
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In an effort to search for a new binary two-level autocorrelation sequence, the decimation-Hadamard transform (DHT) based on special classes of known binary sequences with two-level autocorrelation is investigated. It is theoretically proved that some realizations of a binary generalized Gordon

Realizations from Decimation Hadamard Transform for Special Classes of Binary Sequences with Two-level Autocorrelation

by Nam Yul Yu, Guang Gong
"... Abstract. In an eort to search for a new binary two-level autocorre-lation sequence, the decimation-Hadamard transform (DHT) based on special classes of known binary sequences with two-level autocorrela-tion is investigated. In the second order DHT of a binary generalized Gordon-Mills-Welch (GMW) se ..."
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Abstract. In an eort to search for a new binary two-level autocorre-lation sequence, the decimation-Hadamard transform (DHT) based on special classes of known binary sequences with two-level autocorrela-tion is investigated. In the second order DHT of a binary generalized Gordon-Mills-Welch (GMW

SCOP: a structural classification of proteins database for the investigation of sequences and structures.

by Tim J P Hubbard , Bart Ailey , Steven E Brenner , Alexey G Murzin , Cyrus Chothia - J. Mol. Biol. , 1995
"... ABSTRACT The Structural Classification of Proteins (SCOP) database provides a detailed and comprehensive description of the relationships of all known proteins structures. The classification is on hierarchical levels: the first two levels, family and superfamily, describe near and far evolutionary ..."
Abstract - Cited by 1552 (24 self) - Add to MetaCart
ABSTRACT The Structural Classification of Proteins (SCOP) database provides a detailed and comprehensive description of the relationships of all known proteins structures. The classification is on hierarchical levels: the first two levels, family and superfamily, describe near and far evolutionary

A combined corner and edge detector

by Chris Harris, Mike Stephens - In Proc. of Fourth Alvey Vision Conference , 1988
"... Consistency of image edge filtering is of prime importance for 3D interpretation of image sequences using feature tracking algorithms. To cater for image regions containing texture and isolated features, a combined corner and edge detector based on the local auto-correlation function is utilised, an ..."
Abstract - Cited by 2453 (2 self) - Add to MetaCart
Consistency of image edge filtering is of prime importance for 3D interpretation of image sequences using feature tracking algorithms. To cater for image regions containing texture and isolated features, a combined corner and edge detector based on the local auto-correlation function is utilised

How much should we trust differences-in-differences estimates?

by Marianne Bertrand, Esther Duflo, Sendhil Mullainathan , 2003
"... Most papers that employ Differences-in-Differences estimation (DD) use many years of data and focus on serially correlated outcomes but ignore that the resulting standard errors are inconsistent. To illustrate the severity of this issue, we randomly generate placebo laws in state-level data on femal ..."
Abstract - Cited by 828 (1 self) - Add to MetaCart
into account the auto-correlation of the data) works well when the number of states is large enough. Two corrections based on asymptotic approximation of the variance-covariance matrix work well for moderate numbers of states and one correction that collapses the time series information into a “pre” and “post

Determining Optical Flow

by Berthold K. P. Horn, Brian G. Schunck - ARTIFICIAL INTELLIGENCE , 1981
"... Optical flow cannot be computed locally, since only one independent measurement is available from the image sequence at a point, while the flow velocity has two components. A second constraint is needed. A method for finding the optical flow pattern is presented which assumes that the apparent veloc ..."
Abstract - Cited by 2404 (9 self) - Add to MetaCart
Optical flow cannot be computed locally, since only one independent measurement is available from the image sequence at a point, while the flow velocity has two components. A second constraint is needed. A method for finding the optical flow pattern is presented which assumes that the apparent

Analysis, Modeling and Generation of Self-Similar VBR Video Traffic

by Mark Garrett, Walter Willinger , 1994
"... We present a detailed statistical analysis of a 2-hour long empirical sample of VBR video. The sample was obtained by applying a simple intraframe video compression code to an action movie. The main findings of our analysis are (1) the tail behavior of the marginal bandwidth distribution can be accu ..."
Abstract - Cited by 548 (6 self) - Add to MetaCart
be accurately described using "heavy-tailed" distributions (e.g., Pareto); (2) the autocorrelation of the VBR video sequence decays hyperbolically (equivalent to long-range dependence) and can be modeled using self-similar processes. We combine our findings in a new (non-Markovian) source model

UCSF Chimera—a visualization system for exploratory research and analysis

by Eric F. Pettersen, Thomas D. Goddard, Conrad C. Huang, Gregory S. Couch, Daniel M. Greenblatt, Elaine C. Meng, Thomas E. Ferrin - J. Comput. Chem , 2004
"... Abstract: The design, implementation, and capabilities of an extensible visualization system, UCSF Chimera, are discussed. Chimera is segmented into a core that provides basic services and visualization, and extensions that provide most higher level functionality. This architecture ensures that the ..."
Abstract - Cited by 504 (7 self) - Add to MetaCart
Abstract: The design, implementation, and capabilities of an extensible visualization system, UCSF Chimera, are discussed. Chimera is segmented into a core that provides basic services and visualization, and extensions that provide most higher level functionality. This architecture ensures
Results 1 - 10 of 9,544