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» On the Covering Steiner Problem
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SIGECOM
2008
ACM
94views ECommerce» more  SIGECOM 2008»
15 years 6 months ago
Optimizing query rewrites for keyword-based advertising
We consider the problem of query rewrites in the context of keyword advertisement. Given a three-layer graph consisting of queries, query rewrites, and the corresponding ads that ...
Azarakhsh Malekian, Chi-Chao Chang, Ravi Kumar, Gr...
DEXA
2009
Springer
153views Database» more  DEXA 2009»
15 years 10 months ago
Three Approximation Algorithms for Energy-Efficient Query Dissemination in Sensor Database System
Abstract. Sensor database is a type of database management system which offers sensor data and stored data in its data model and query languages. In this system, when a user poses ...
Zhao Zhang, Xiaofeng Gao, Xuefei Zhang, Weili Wu, ...
NPL
2008
68views more  NPL 2008»
15 years 6 months ago
On Nonparametric Residual Variance Estimation
In this paper, the problem of residual variance estimation is examined. The problem is analyzed in a general setting which covers non-additive heteroscedastic noise under non-iid s...
Elia Liitiäinen, Francesco Corona, Amaury Len...
WWW
2006
ACM
16 years 7 months ago
Visualizing tags over time
We consider the problem of visualizing the evolution of tags within the Flickr (flickr.com) online image sharing community. Any user of the Flickr service may append a tag to any ...
Micah Dubinko, Ravi Kumar, Joseph Magnani, Jasmine...
IJSNET
2008
138views more  IJSNET 2008»
15 years 6 months ago
Energy-efficient connected-coverage in wireless sensor networks
Abstract: This paper addresses the target coverage problem in wireless sensor networks. Communication and sensing consume energy, therefore efficient power management can extend ne...
Ionut Cardei, Mihaela Cardei