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2008
IEEE
15 years 6 months ago
Approximation Algorithms for Single-minded Envy-free Profit-maximization Problems with Limited Supply
We present the first polynomial-time approximation algorithms for single-minded envy-free profit-maximization problems [13] with limited supply. Our algorithms return a pricing sc...
Maurice Cheung, Chaitanya Swamy
AMC
1999
102views more  AMC 1999»
15 years 6 months ago
Analysis and approximation of optimal control problems for first-order elliptic systems in three dimensions
We examine analytical and numerical aspects of optimal control problems for firstorder elliptic systems in three dimensions. The particular setting we use is that of divcurl syste...
Max Gunzburger, Hyung-Chun Lee
CHI
2002
ACM
16 years 6 months ago
Effects of structure and label ambiguity on information navigation
We present experimental results showing that search for target items in a three-tiered categorization structure (approximately 8 links per page) is faster than a comparable two-ti...
Craig S. Miller, Roger W. Remington
DKE
2008
96views more  DKE 2008»
15 years 6 months ago
Fragment-based approximate retrieval in highly heterogeneous XML collections
Due to the heterogeneous nature of XML data for internet applications exact matching of queries is often inadequate. The need arises to quickly identify subtrees of XML documents ...
Ismael Sanz, Marco Mesiti, Giovanna Guerrini, Rafa...
TSP
2010
15 years 1 months ago
Double sparsity: learning sparse dictionaries for sparse signal approximation
Abstract--An efficient and flexible dictionary structure is proposed for sparse and redundant signal representation. The proposed sparse dictionary is based on a sparsity model of ...
Ron Rubinstein, Michael Zibulevsky, Michael Elad