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CCS
2003
ACM
14 years 18 days ago
Using graphic turing tests to counter automated DDoS attacks against web servers
We present WebSOS, a novel overlay-based architecture that provides guaranteed access to a web server that is targeted by a denial of service (DoS) attack. Our approach exploits t...
William G. Morein, Angelos Stavrou, Debra L. Cook,...
CHI
2004
ACM
14 years 7 months ago
Sharp or smooth?: comparing the effects of quantization vs. frame rate for streamed video
We introduce a new methodology to evaluate the perceived quality of video with variable physical quality. The methodology is then used to assess an existing guideline that high fr...
John D. McCarthy, Martina Angela Sasse, Dimitrios ...
EDBT
2004
ACM
163views Database» more  EDBT 2004»
14 years 7 months ago
Energy-Conserving Air Indexes for Nearest Neighbor Search
A location-based service (LBS) provides information based on the location information specified in a query. Nearest-neighbor (NN) search is an important class of queries supported ...
Baihua Zheng, Jianliang Xu, Wang-Chien Lee, Dik Lu...
MCAM
2007
Springer
125views Multimedia» more  MCAM 2007»
14 years 1 months ago
Fingerprinting Codes for Live Pay-Television Broadcast Via Internet
In recent years, with the rapid growth of the Internet as well as the increasing demand for broadband services, live pay-television broadcasting via internet has become a promising...
Shuhui Hou, Tetsutaro Uehara, Yoshitaka Morimura, ...
IPSN
2005
Springer
14 years 26 days ago
Perpetual environmentally powered sensor networks
— Environmental energy is an attractive power source for low power wireless sensor networks. We present Prometheus, a system that intelligently manages energy transfer for perpet...
Xiaofan Jiang, Joseph Polastre, David E. Culler