Results 121 to 130 of about 2,134,041 (173)

The Robin problems for the coupled system of reaction–diffusion equations

Boundary Value Problems
This article investigates the local well-posedness of Turing-type reaction–diffusion equations with Robin boundary conditions in the Sobolev space. Utilizing the Hadamard norm, we derive estimates for Fokas unified transform solutions for linear initial ...
Po-Chun Huang, Bo-Yu Pan
doaj   +1 more source

Projective surfaces not as Hadamard products and the dimensions of the Hadamard joins [PDF]

arXiv
We study the dimensions of Hadamard products of $k\ge 3$ varieties if we allow to modify $k-1$ of them by the action of a general projective linear transformation. We also prove that the join of a variety not contained in a coordinate hyperplane with a ``nice'' curve always has the expected dimension.
arxiv  

Lagrange multiplier selection based on SATD for H.265/HEVC

Tongxin xuebao, 2017
In order to improve the coding performance of intra rough mode decision,a SATD-based Lagrange multiplier selection algorithm was proposed for H.265/HEVC.The characteristic of Hadamard transform was first analyzed,and following the new Lagrange multiplier
Wei LI, Fan ZHAO, Er-hu ZHANG, Peng REN
doaj   +2 more sources

An audio encryption scheme based on Fast Walsh Hadamard Transform and mixed chaotic keystreams

Applied Computing and Informatics, 2020
F. J. Farsana, V. R. Devi, K. Gopakumar
semanticscholar   +1 more source

PAPR reduction of optical OFDM signals in visible light communications

ICT Express, 2019
Orthogonal frequency division multiplexing (OFDM) is extensively used in optical communications to achieve high rate transmission. In this paper, Vandermonde like matrix (VLM) pre-coding approach is offered to reduce the high peak-to-average power ratio (
Abbas Ali Sharifi
doaj  

A chaotic colour image encryption scheme combining Walsh–Hadamard transform and Arnold–Tent maps

Journal of Ambient Intelligence and Humanized Computing, 2019
P. Sneha, S. Sankar, Ashok S. Kumar
semanticscholar   +1 more source

Semi-fragile watermark algorithm based on Walsh-Hadamard transformand and convolution coding

Tongxin xuebao, 2009
A semi-fragile watermark algorithm based on the Walsh-Hadamard transform and convolution coding was proposed. In this algorithm, the watermark content of the host image was extracted by differential coding and convolution coding respectively based on the
ZHAO Feng1, LI Jian2, LI Sheng-hong2
doaj  

A partial Hadamard transform approach to the design of cancelable fingerprint templates containing binary biometric representations

Pattern Recognition, 2017
Song Wang, G. Deng, Jiankun Hu
semanticscholar   +1 more source

Design and Implementation of Sequency-Ordered Fast Walsh-Hadamard Transform (FWHT) in WCDMA

Tikrit Journal of Engineering Sciences, 2014
Safaa M. Z. Al-Ubaidi
doaj  

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Fast reconstructed and high-quality ghost imaging with fast Walsh–Hadamard transform

Photonics Research, 2016
In this paper, we propose a ghost imaging scheme with fast Walsh–Hadamard transform, named GIFWHT. In the scheme, Walsh–Hadamard pattern pairs are used to illuminate an object to generate pairs of detection results, and the corresponding differential ...
Le Wang, Shengmei Zhao
exaly   +2 more sources