75,377 research outputs found
Bibliographic Control of Serial Publications
An important problem with serials is bibliographic control. What good
does it do for libraries to select, acquire, record, catalog, and bind large
holdings of serial publications if the contents of those serials remain a mystery
to all except the few who have the opportunity to examine selected journals
of continuing personal interest and have discovered some magic way of
retaining the gist of the contents? Bibliographic control is the indexing and
abstracting of the contents or guts of what is included in the serials. It is this
control, provided by secondary publishing services, which this article will
discuss.
Just as there are problems with serials in general, there are some easily
identifiable problems connected with their bibliographic control including:
volume, overlap, costs, elements and methods, and a few other miscellaneous
considerations. Some history of bibliographic control will also put the current
problems in a helpful perspective. Hereafter "bibliographic control" will be
designated by the term "abstracting and indexing," one of these alone, or the
shorter "a & i." (I do distinguish between abstracting and indexing and believe
that they are not in order of importance and difficulty.) Although a & i do
provide bibliographic control, this paper will not discuss cataloging, tables of
contents, back-of-the-book indexes, year-end indexes, cumulative indexes, lists
of advertisers, or bibliographies.
If there is to be control, there must always be indexing. Abstracting is a
short cut, a convenience, and perhaps a bibliographic luxury which may be
now, or is fast becoming, too rich, in light of other factors to be discussed,
for library blood and for the users of libraries especially for the users of
indexes who may not depend upon the library interface. Abstracting, though,
provides a desirable control, and one which will continue to be advocated.published or submitted for publicatio
Termination of rewriting strategies: a generic approach
We propose a generic termination proof method for rewriting under strategies,
based on an explicit induction on the termination property. Rewriting trees on
ground terms are modeled by proof trees, generated by alternatively applying
narrowing and abstracting steps. The induction principle is applied through the
abstraction mechanism, where terms are replaced by variables representing any
of their normal forms. The induction ordering is not given a priori, but
defined with ordering constraints, incrementally set during the proof.
Abstraction constraints can be used to control the narrowing mechanism, well
known to easily diverge. The generic method is then instantiated for the
innermost, outermost and local strategies.Comment: 49 page
Criminology and penology abstracts: analysis
ReviewAn analysis of Criminology and Penology Abstracts is "An international abstracting service covering the etiology of crime and juvenile delinquency, the control and treatment of offenders, criminal procedure, and the administration of justice
Abstracting the Traffic of Nonlinear Event-Triggered Control Systems
Scheduling communication traffic in networks of event-triggered control (ETC)
systems is challenging, as their sampling times are unknown, hindering
application of ETC in networks. In previous work, finite-state abstractions
were created, capturing the sampling behaviour of LTI ETC systems with
quadratic triggering functions. Offering an infinite-horizon look to all
sampling patterns of an ETC system, such abstractions can be used for
scheduling of ETC traffic. Here we significantly extend this framework, by
abstracting perturbed uncertain nonlinear ETC systems with general triggering
functions. To construct an ETC system's abstraction: a) the state space is
partitioned into regions, b) for each region an interval is determined,
containing all intersampling times of points in the region, and c) the
abstraction's transitions are determined through reachability analysis. To
determine intervals and transitions, we devise algorithms based on reachability
analysis. For partitioning, we propose an approach based on isochronous
manifolds, resulting into tighter intervals and providing control over them,
thus containing the abstraction's non-determinism. Simulations showcase our
developments
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