Marianne Winslett Wilkins

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In this paper we consider approaches to updating databases containing null values and incomplete information. Our approach distinguishes between modeling incompletely known worlds and modeling changes in these worlds. As an alternative to the open and closed world assumptions, we propose the expanded closed world assumption. Under this assumption, we(More)
In this paper we consider approaches to updating databases containing null values and incomplete information. Our approach distinguishes between modeling incompletely known worlds and modeling changes in these worlds. As an alternative to the open and closed world assumptions, we propose the modified closed world assumption. Along with the discussion of(More)
Databases have a number of advantages over specialized design files for use in the VLSI design process. Balanced against these advantages is the presumed extra run-time cost of accessing the database. In particular, ordinary relational databases appear to be too slow to be used on-line by engineers in the design process [Eastman 80, Haynie 81, Sidle 80,(More)
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