Recent advances in non-monotonic semantics of deductive databases provide a simple framework for modeling the even-condition-action rules of active databases. This approach unifies the semantics of active and deductive databases and yields several benefits.

We provide a logic-based semantics for active database rules under the immediately-after, tuple-level activation policy of SQL3. This result allows us to characterize and analyze the behavior of complex rule systems using the declarative framework of stable models, and to lay the theoretical

with diminishing returns to scale. The adjusted R 2 in model (3) is 13.6%. Because fund sequence number appears to have little effect on fund performance in our dataset, and because it is frequently unavailable in the Venture Economics database, we replace it with a dummy equaling one for first-time funds. We also

Fuzzy logic has been successfully applied in various fields. However, as fuzzy controllers increase in size and complexity, the number of control rules increases exponentially and real-time behavior becomes more difficult. This thesis introduces an any-time fuzzy controller. Much work has been done

In modern logic, a model is a structure that makes all sentences of a theory true, where a theory is taken to be a (usually deductively closed) set of sentences in a formal language (see Bell and Machover 1977 or Hodges 1997 for details). The structure is a 'model' in the sense that it is what

of knowledge and a book in Her lotus hands. Dedicated to the Lotus Feet of the revered Sadguru. This thesis presents a new active mask (AM) framework and an algorithm for segmenta-tion of digital images, particularly those of punctate patterns from fluorescence microscopy. Fluorescence microscopy has greatly

serious alternative. This work analyzes the implementation of both a client-server and a peer-to-peer networking model for the prototype shooter game Planet π4. Initially, a survey introduces recent academic approaches to peer-to-peer systems specifically designed for games. Of those, one system

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The recent discovery of dark energy has prompted an investigation of ways in which the accelerated expansion of the universe can be realized. In this dissertation, we present two separate projects related to dark energy. The first project analyzes a class of braneworld models in which multiple

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