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ICML
2008
IEEE
16 years 19 days 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
STOC
2009
ACM
87views Algorithms» more  STOC 2009»
16 years 13 days ago
Randomly supported independence and resistance
We prove that for any positive integer k, there is a constant ck such that a randomly selected set of cknk log n Boolean vectors with high probability supports a balanced k-wise i...
Per Austrin, Johan Håstad
ICC
2007
IEEE
110views Communications» more  ICC 2007»
15 years 6 months ago
Quadratic-Congruence Carrier-Hopping Prime Code for Multicode-Keying Optical CDMA
—In this paper, we study a new family of carrier-hopping prime codes (CHPCs), so-called quadraticcongruence CHPC (QC-CHPC), with expanded code cardinality by relaxing the maximum...
Wing C. Kwong, Cheng-Yuan Chang, Hung-Ta Chen, Guu...
INFOCOM
2007
IEEE
15 years 6 months ago
Anonymous Tracking Using RFID Tags
Abstract—The increasing use of RFID tags in many applications have brought forth valid concerns of privacy and anonymity among users. One of the primary concerns with RFID tags i...
Murali S. Kodialam, Thyaga Nandagopal, Wing Cheong...
SSDBM
2007
IEEE
121views Database» more  SSDBM 2007»
15 years 6 months ago
Cost-based Optimization of Complex Scientific Queries
High energy physics scientists analyze large amounts of data looking for interesting events when particles collide. These analyses are easily expressed using complex queries that ...
Ruslan Fomkin, Tore Risch