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Haystack is a novel personal information management system whose goal is to provide an intuitive interface to a user's documents. This thesis describes the author's eeorts to advance the system in several directions. First, we analyze the problem of metadata representation and present a data model based on a directed graph structure. The data model is(More)
The airline scheduling process used by major airlines today aims to develop optimal schedules which maximize revenue. However, these schedules are often far from optimal" once deployed in the real world because they do not accurately take into account possible weather, air traac control ATC, and other disruptions that can occur during operation. The(More)
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