In this paper a novel configuration for multichannel teleconferencing with multi spatial region acoustic echo cancellation is developed. In the proposed configuration, the transmission and receiving rooms are divided into equivalent number of spatial regions and adaptive filters are attached to each spatial region for the purpose of echo cancellation. This multi spatial region acoustic echo can...

Multi-Model Adaptive Spatial Hypertext. (December 2004) Luis Francisco-Revilla, B.S., Universidad Iberoamericana; M.S., Texas A&M University Chair of Advisory Committee: Dr. Frank M. Shipman, III Information delivery on the Web often relies on general purpose Web pages that require the reader to adapt to them. This limitation is addressed by approaches such as spatial hypermedia and adaptive hy...

SUMMARY Due to user requirements, it is very common to encounter situations where multi-scale spatial data is necessary. Data integration is highly desired due to the decreasing long-term costs of obtaining and maintaining data, as well as its beneficial effects on data consistency and accuracy within agencies. Paradoxically, complete and integrated multi-scale spatial databases are very rare. ...

For computer software, the semantics of spatial information is not a trivial issue. Due to the differences between human spatial cognition, reasoning, and communication, and its computerised counterpart, a number of difficulties persist in bringing the two paradigms together. While the qualitative way in which humans reason about space enables them to solve all kinds of spatial problems in thei...

Internally cured (IC) concrete is frequently produced in North America using pre-wetted lightweight aggregate (LWA). One important aspect associated with the production of quality IC concrete is the accurate determination of the moisture content, including absorbed moisture and surface moisture of the LWA. Knowledge of the moisture content enables aggregate moisture corrections to be made for t...

Geo-referenced information is characterised by the fact that it may be represented on maps at different levels of detail or generalisation. Ideally a spatial database will provide access to spatial data across a continuous range of resolution and multiple levels of generalisation. Existing work on multiresolution databases has treated generalisation control as one-dimensional. Here we extend th...