Dedicatory Entry

Dedicatory essay on John C. Fletcher.

Entry Entry Entry

A new kind of data model has recently emerged in which the database is not constrained by a conventional schema. Systems like ACeDB, which has become very popular with biologists, and the recent Tsimmis proposal for data integration organize data in tree-like structures whose components can be used equally well to represent sets and tuples. Such structures allow great exibility in data represen...

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For certain database tasks that require great exibility, some people are turning to a new kind of data representation in which the database is not constrained by a schema. Instead, each component of the database carries its own description, which is independent of other components. Systems like ACeDB, which has become very popular with biologists, and the recent Tsimmis proposal for data integr...

Indoor radon entry: 30 years later

The paper discusses the results of 30 years of radon indoor entry research. While some progress has been made, many discrepancies between current theories and experimental data still remain. Misconceptions of radon transport mechanisms in homes are analyzed. The role of US Environmental Protection Agency in radon indoor entry research is examined and the agency's policies are criticize...

Free entry versus socially optimal entry

This paper reconsiders the well known comparison of equilibrium entry levels into a Cournot industry under free entry and under the two commonly used socially optimal schemes. Allowing for the possibility of increasing returns to scale in production, this paper generalizes the conclusion of [Mankiw and Whinston, Rand J. 1986], that free entry yields more …rms than the second-best socially optim...