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The acoustic environment of the continental shelf slope waveguide is more complex than those with flat bottoms. For a long receiving array in this area, the amplitude and phase of the received signals will be distortional, leading an attenuation in the spatial correlation of the sound field and a degradation in the array gain of beamformers. This paper shows the performances of three beamformers:...
Nonnegative matrix factorization (NMF) is a popular method for source separation. In this paper, an alternating direction method of multipliers (ADMM) for NMF is studied, which deals with the NMF problem using the cost function of beta-divergence. Our study shows that this algorithm outperforms state-of-the-art algorithms on synthetic data sets, but it presents unstable behavior and low accuracy on...
This paper proposes an adaptive algorithm for kernel principal component analysis (KPCA). Compared to existing work: i) the proposed algorithm does not rely on assumptions, ii) combines the up- and downdating step to become a single operation, iii) the adaptation of the eigendecompsition can, computationally, reduce to and iv) the proposed algorithm is more accurate. To demonstrate these benefits,...
This paper presents a novel lexical-similarity-based approach to automatic story segmentation in broadcast news. When measuring the connection between a pair of sentences, we take two factors into consideration, i.e. the lexical similarity and the distance between them in the text stream. Further investigation of pairwise connections between sentences is based on the technique of Laplacian Eigenmaps...
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