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PODS
2011
ACM
238views Database» more  PODS 2011»
14 years 1 months ago
Beyond simple aggregates: indexing for summary queries
Database queries can be broadly classified into two categories: reporting queries and aggregation queries. The former retrieves a collection of records from the database that mat...
Zhewei Wei, Ke Yi
STOC
2004
ACM
121views Algorithms» more  STOC 2004»
15 years 11 months ago
Lower bounds for dynamic connectivity
We prove an (lg n) cell-probe lower bound on maintaining connectivity in dynamic graphs, as well as a more general trade-off between updates and queries. Our bound holds even if t...
Mihai Patrascu, Erik D. Demaine
ICDT
2010
ACM
219views Database» more  ICDT 2010»
15 years 8 months ago
Aggregate Queries for Discrete and Continuous Probabilistic XML
Sources of data uncertainty and imprecision are numerous. A way to handle this uncertainty is to associate probabilistic annotations to data. Many such probabilistic database mode...
Serge Abiteboul, T.-H Hubert Chan, Evgeny Kharlamo...
ISPD
2010
ACM
195views Hardware» more  ISPD 2010»
15 years 5 months ago
Density gradient minimization with coupling-constrained dummy fill for CMP control
In the nanometer IC design, dummy fill is often performed to improve layout pattern uniformity and the post-CMP quality. However, filling dummies might greatly increase intercon...
Huang-Yu Chen, Szu-Jui Chou, Yao-Wen Chang
CIKM
2009
Springer
15 years 5 months ago
Post-rank reordering: resolving preference misalignments between search engines and end users
No search engine is perfect. A typical type of imperfection is the preference misalignment between search engines and end users, e.g., from time to time, web users skip higherrank...
Chao Liu, Mei Li, Yi-Min Wang