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ACM Transactions on Information Systems (TOIS), Volume 25 Issue 3, July 2007

Answering XML queries by means of data summaries
Elena Baralis, Paolo Garza, Elisa Quintarelli, Letizia Tanca
Article No.: 10
DOI: 10.1145/1247715.1247716

XML is a rather verbose representation of semistructured data, which may require huge amounts of storage space. We propose a summarized representation of XML data, based on the concept of instance pattern, which can both provide succinct...

Online supervised spam filter evaluation
Gordon V. Cormack, Thomas R. Lynam
Article No.: 11
DOI: 10.1145/1247715.1247717

Eleven variants of six widely used open-source spam filters are tested on a chronological sequence of 49086 e-mail messages received by an individual from August 2003 through March 2004. Our approach differs from those previously reported in that...

Discovering personally meaningful places: An interactive clustering approach
Changqing Zhou, Dan Frankowski, Pamela Ludford, Shashi Shekhar, Loren Terveen
Article No.: 12
DOI: 10.1145/1247715.1247718

The discovery of a person's meaningful places involves obtaining the physical locations and their labels for a person's places that matter to his daily life and routines. This problem is driven by the requirements from emerging location-aware...

On setting the hyper-parameters of term frequency normalization for information retrieval
Ben He, Iadh Ounis
Article No.: 13
DOI: 10.1145/1247715.1247719

The setting of the term frequency normalization hyper-parameter suffers from the query dependence and collection dependence problems, which remarkably hurt the robustness of the retrieval performance. Our study in this article investigates three...

Temporal profiles of queries
Rosie Jones, Fernando Diaz
Article No.: 14
DOI: 10.1145/1247715.1247720

Documents with timestamps, such as email and news, can be placed along a timeline. The timeline for a set of documents returned in response to a query gives an indication of how documents relevant to that query are distributed in time. Examining...