Geographic objects associated with descriptive texts are becoming prevalent. This gives
prominence to spatial keyword queries that take into account both the locations and textual …

After decades of effort working on database performance, the quality and the usability of
database systems have received more attention in recent years. In particular, the feature of …

This is an introduction to multicast routing, which is the study of methods for routing from one
source to many destinations, or from many sources to many destinations. Multicast is …

Given a set of objects, each with multiple numeric attributes, a (preference) top-k query
retrieves the k objects with the highest scores according to a user preference, defined as a …

Recommender systems have become an essential instrument to connect people to the items
that they need. Online grocery shop** is one scenario where this is very clear. So-called …

Nowadays, most applications return to the user a limited set of ranked results based on the
individual user's preferences, which are commonly expressed through top-k queries. From …

Reverse k nearest neighbor (RkNN) queries have a broad application base such as
decision support, profile-based marketing, and resource allocation. Previous work on RkNN …

Top-k queries return to the user only the k best objects based on the individual user
preferences and comprise an essential tool for rank-aware query processing. Assuming a …

This work considers why-not questions in the context of top-k queries and score-based
ranking functions. Following the popular linear scalarization approach for multi-objective …

A regret minimizing set Q is a small size representation of a much larger database P so that
user queries executed on Q return answers whose scores are not much worse than those on …