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ICML
2008
IEEE
16 years 7 months ago
Expectation-maximization for sparse and non-negative PCA
We study the problem of finding the dominant eigenvector of the sample covariance matrix, under additional constraints on the vector: a cardinality constraint limits the number of...
Christian D. Sigg, Joachim M. Buhmann
ISBI
2006
IEEE
16 years 7 months ago
Mixture principal component analysis for distribution volume parametric imaging in brain PET studies
In this paper, we present a mixture Principal Component Analysis (mPCA)-based approach for voxel level quantification of dynamic positron emission tomography (PET) data in brain s...
Peng Qiu, Z. Jane Wang, K. J. Ray Liu
WWW
2006
ACM
16 years 7 months ago
GoGetIt!: a tool for generating structure-driven web crawlers
We present GoGetIt!, a tool for generating structure-driven crawlers that requires a minimum effort from the users. The tool takes as input a sample page and an entry point to a W...
Altigran Soares da Silva, Edleno Silva de Moura, J...
KDD
2009
ACM
204views Data Mining» more  KDD 2009»
16 years 7 months ago
DOULION: counting triangles in massive graphs with a coin
Counting the number of triangles in a graph is a beautiful algorithmic problem which has gained importance over the last years due to its significant role in complex network analy...
Charalampos E. Tsourakakis, U. Kang, Gary L. Mille...
KDD
2009
ACM
141views Data Mining» more  KDD 2009»
16 years 7 months ago
Meme-tracking and the dynamics of the news cycle
Tracking new topics, ideas, and "memes" across the Web has been an issue of considerable interest. Recent work has developed methods for tracking topic shifts over long ...
Jure Leskovec, Lars Backstrom, Jon M. Kleinberg
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