5,182 research outputs found
Automaton-based parsing for lexicalized grammars
In wide-coverage lexicalized grammars many of the elementary structures have substructures in common. This means that during parsing some of the computation associated with different structures is duplicated. This paper explores ways in which the grammar can be precompiled into finite state automata so that some of this shared structure results in shared computation at run-time. 1 Introduction This paper investigates grammar precompilation techniques aimed at improving the parsing performance of lexicalized grammars. In a wide-coverage lexicalized grammar, such as the XTAG grammar (XTAG-Group, 1995), many of the elementary structures 1 have substructures in common. If such structures are viewed as independent by a parsing algorithm, the computation associated with their shared structure may be duplicated. This paper explores ways in which the grammar can be precompiled so that some of this shared structure results in shared computation at run-time. We assume as a starting point a co..
Encoding Lexicalized Tree Adjoining Grammars with a Nonmonotonic Inheritance Hierarchy
This paper shows how DATR, a widely used formal language for lexical
knowledge representation, can be used to define an LTAG lexicon as an
inheritance hierarchy with internal lexical rules. A bottom-up featural
encoding is used for LTAG trees and this allows lexical rules to be implemented
as covariation constraints within feature structures. Such an approach
eliminates the considerable redundancy otherwise associated with an LTAG
lexicon.Comment: Latex source, needs aclap.sty, 8 page
Integrable Lattice Models for Conjugate
A new class of integrable lattice models is presented. These are
interaction-round-a-face models based on fundamental nimrep graphs associated
with the conjugate modular invariants, there being a model for each
value of the rank and level. The Boltzmann weights are parameterized by
elliptic theta functions and satisfy the Yang-Baxter equation for any fixed
value of the elliptic nome q. At q=0, the models provide representations of the
Hecke algebra and are expected to lead in the continuum limit to coset
conformal field theories related to the conjugate modular
invariants.Comment: 18 pages. v2: minor changes, such as page 11 footnot
Supporting text mining for e-Science: the challenges for Grid-enabled natural language processing
Over the last few years, language technology has moved rapidly from 'applied research' to 'engineering', and from small-scale to large-scale engineering. Applications such as advanced text mining systems are feasible, but very resource-intensive, while research seeking to address the underlying language processing questions faces very real practical and methodological limitations. The e-Science vision, and the creation of the e-Science Grid, promises the level of integrated large-scale technological support required to sustain this important and successful new technology area. In this paper, we discuss the foundations for the deployment of text mining and other language technology on the Grid - the protocols and tools required to build distributed large-scale language technology systems, meeting the needs of users, application builders and researchers
Eductive stability in real business cycle models
We re-examine issues of coordination in the standard RBC model. Can the unique rational expectations equilibrium be “educed” by rational agents who contemplate the possibility of small deviations from equilibrium? Surprisingly, we find that coordination along this line cannot be expected. Rational agents anticipating small but possibly persistent deviations have to face the existence of retroactions that necessarily invalidate any initial tentative “common knowledge” of the future. This "impossibility" theorem for eductive learning is not fully overcome when adaptive learning is incorporated into the framework.standard RBC model ; coordination
Texas Fresh Citrus Shipments by Containers 1972-73
Texas, Citrus, Shipments, Containers, Crop Production/Industries, Food Consumption/Nutrition/Food Safety, Productivity Analysis,
Texas Fresh Citrus Shipments by Market Areas, 1973-74
Texas Citrus, Citrus, Shipments, Market Areas, Crop Production/Industries, Marketing,
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