A database to be used by electrical circuit design, test, and repair expert systems must support both structural data and inferential data about the circuit. It is well known that engineering databases must support dynamic schema (re)definition of the structural data and entity-based access to it. We analyze this requirement...
Tbc expanding complexity of database application worlds, and the accelerating pace of change of these worlds mandate data models which support some of the tasks of data interpretation which formerly were borne by the applications programs. Chief among these are the support for virtual data, definition of transactions, and enforcement...
A software system to study network algorithms was implemented on UNIX. Each part of a network algorithm can be written as a single C program which becomes a virtual node in the network. During a simulation all virtualized nodes run as separate processes on a single PDP 11/44. Inter-node communication...
This paper presents a model for deterministic parsing which was designed to simplify the task or writing and understanding a deterministic grammar. While retaining structures and operations similar to those or Marcus's PARSIFAL parser [Marcus 80] the grammar language incorporates the following changes. (1) The use or productions operating in...