The most frequently used local database system failure recovery techniques are logging, shadowing and differential files. In a distributed database these, local system failure recovery techniques may be utilized for recovery ...
Most statically typed Algol-style languages were designed to conform with the view that a value belongs to one and only one type. The adoption of this view bought compiler simplicity at the expense of language expressivity. ...
Statecharts were developed by Harel et al [10] to specify complex reactive systems.
In this paper we report on our application of statecharts as a design and specification
tool for an X-Windows based Graphical User ...
There is, as yet, no single formal definition for the object-oriented approach. The object-oriented paradigm is described in terms of the concepts accentuated by the approach, namely classes, objects, methods, messages and ...
Recently, there have been various attempts to combine the strengths of
similarity-based learning (SBL) and explanation-based learning (EBL) in a single learning system.
We describe a graph-based learning method called ...
In current database systems the responsibility for enforcing security is often given to the various application programs. Even where the Database Management System (DBMS) does supply security mechanisms, a single application ...
CommunIcations networks with sporadically available links pose particular problems
in terms of delay analysis. This paper presents an approach to determining the effectiveness of various routing strategies when applied ...
Parallel simulation, if it is to become a mainstream technology, must become reasonably accessible to programmer s without unusual skills. Since low-cost shared memory machines are becoming an increasing possibility a ...
An object-orientated framework for the design of distributed virtual memory consistency is presented. It is shown that custom designed protocols for different types of applications are easy to construct and use within this ...
The MultiServer centre with Hierarchical Concurrency Constraints
(MSHCC) is an exponential multiserver with a queueing discipline which imposes restrictions on the number of customers of different types and subtypes that ...
A kernel has been developed which can be used to simplify the development of control software. It can be used to control several physical machines which are interconnected via a fast local area network. One or more virtual ...
In a process control environment, batch processes, as opposed to continuous processes, are characterised by multi-product manufacturing lines producing relatively small quantities which often involves frequent product ...
We discuss the implementation of Rhoda, our Linda-like Tuple Space server which runs under the Helios operating system. The approach analyses and partitions tuple space at compile time in order to reduce the run time ...
In conventional systems, transaction management has been thoroughly investigated and is
now considered to be well understood. Transaction management in multidatabase systems,
however, is less well understood. A multidatabase ...
This paper presents a formal technique for enforcing deterministic execution in Petri nets, and proceeds to demonstrate how the resultant topology may be used to enforce partial sequencing so that various ...
The current generation of widely-used, multi-user, general-purpose operating systems have evolved from versions that were designed when many of the issues that are important today were unimportant or not even thought of. ...
A method is presented whereby the interior of boundary-defined regions on vector type devices may be shaded using regular line, cross-hatch and dot patterns. Different shades are realized by changing ...
Numerous concurrency control methods have been proposed for distributed databases. Various criteria are used to compare these methods. The comparisons range from qualitative overviews through quantitative analyses ...
Difference equation methods are used to develop redundant (n-version) programs required for high reliability computing systems. The n-version programs are developed by exploiting the iterative nature of real time software.
The ...