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Matrix multiplication (GEMM) is a core operation to numerous scientific applications. Traditional implementations of Strassen-like fast matrix multiplication (FMM) algorithms often do not perform well except for very large matrix sizes, due to the increased cost of memory movement, which is particularly noticeable for non-square matrices. Such implementations also require considerable workspace and...
We dispel with “street wisdom” regarding the practical implementation of Strassen's algorithm for matrix-matrix multiplication (DGEMM). Conventional wisdom: it is only practical for very large matrices. Our implementation is practical for small matrices. Conventional wisdom: the matrices being multiplied should be relatively square. Our implementation is practical for rank-k updates, where k is relatively...
With the heavily increasing of the number of space debris, research of positioning for space target image gradually becomes a hot topic. Generally, results of sub-pixel positioning will directly affect the orbit positioning accuracy of space targets. Centroid method, median method, one-dimensional and two-dimensional Gaussian fitting are commonly used positioning methods. Positioning performance for...
Nearest neighbor search is a cornerstone problem in computational geometry, non-parametric statistics, and machine learning. For N points, exhaustive search requires quadratic work, but many fast algorithms reduce the complexity for exact and approximate searches. The common kernel (kNN kernel) in all these algorithms solves many small-size problems exactly using exhaustive search. We propose an efficient...
Small sample space target recognition is a difficult problem in applications because the limited training samples cannot lead to satisfactory recognition accuracy. Combined with novel compression perception theory, we propose a new space target recognition method based on compressive sensing. This method avoids the sophisticated image preprocessing and feature extraction process. Firstly, a sparse...
Axial Ge/Si heterostructure nanowires allow energy band-edge engineering along the axis of the nanowire, which is the charge transport direction, and allows the realization of novel asymmetric device architectures. This work reports on two advances in the area of heterostructure nanowires and tunnel FETs: (i) the realization of 100 % compositionally modulated Si/Ge axial heterostructure nanowires...
This paper focuses on the main interference signals of the civil aviation air-to-ground communication, which characteristics is constant modulus. An interference suppression receiver based on constant modulus algorithm (CMA) and adaptive cancelling technique is developed in this paper. The constant modulus algorithm is used to extract the reference signal from mixed signal and adaptive canceller is...
An algorithm of interference suppression for the Very High Frequency (VHF) air-ground communication in civil aviation is presented in this paper. Based on the analysis of the civil aviation VHF air-ground communication characteristics, the blind signal extraction (BSE) model for the civil aviation VHF air-ground communication is established, and the interference suppression scheme is proposed. The...
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