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ACM Transactions on Information Systems (TOIS), Volume 16 Issue 3, July 1998

Augmenting organizational memory: a field study of answer garden
Mark S. Ackerman
Pages: 203-224
DOI: 10.1145/290159.290160
A growing concern for organizations and groups has been to augment their knowledge and expertise. One such augmentation is to provide an organizational memory, some record of the organization's knowledge. However, relatively little is known...

A study of probability kinematics in information retrieval
F. Crestani, C. J. van Rijsbergen
Pages: 225-255
DOI: 10.1145/290159.290161
We analyze the kinematics of probabilistic term weights at retrieval time for different Information Retrieval models. We present four models based on different notions of probabilistic retrieval. Two of these models are based on classical...

Arithmetic coding revisited
Alistair Moffat, Radford M. Neal, Ian H. Witten
Pages: 256-294
DOI: 10.1145/290159.290162
Over the last decade, arithmetic coding has emerged as an important compression tool. It is now the method of choice for adaptive coding on myltisymbol alphabets because of its speed, low storage requirements, and effectiveness of compression....