2,545 research outputs found
Rapid Development of Morphological Descriptions for Full Language Processing Systems
I describe a compiler and development environment for feature-augmented
two-level morphology rules integrated into a full NLP system. The compiler is
optimized for a class of languages including many or most European ones, and
for rapid development and debugging of descriptions of new languages. The key
design decision is to compose morphophonological and morphosyntactic
information, but not the lexicon, when compiling the description. This results
in typical compilation times of about a minute, and has allowed a reasonably
full, feature-based description of French inflectional morphology to be
developed in about a month by a linguist new to the system.Comment: 8 pages, LaTeX (2.09 preferred); eaclap.sty; Procs of Euro ACL-9
Effectively Solving NP-SPEC Encodings by Translation to ASP
NP-SPEC is a language for specifying problems in NP in a declarative way. Despite the fact that the semantics of the language was given by referring to Datalog with circumscription, which is very close to ASP, so far the only existing implementations are by means of ECLiPSe Prolog and via Boolean satisfiability solvers. In this paper, we present translations from NP-SPEC into ASP, and provide an experimental evaluation of existing implementations and the proposed translations to ASP using various ASP solvers. The results show that translating to ASP clearly has an edge over the existing translation into SAT, which involves an intrinsic grounding process. We also argue that it might be useful to incorporate certain language constructs of NPSPEC into mainstream ASP
Partition functions and equilibrium constants for diatomic molecules and atoms of astrophysical interest
Partition functions and dissociation equilibrium constants are presented for
291 diatomic molecules for temperatures in the range from near absolute zero to
10000 K, thus providing data for many diatomic molecules of astrophysical
interest at low temperature. The calculations are based on molecular
spectroscopic data from the book of Huber and Herzberg with significant
improvements from the literature, especially updated data for ground states of
many of the most important molecules by Irikura. Dissociation energies are
collated from compilations of experimental and theoretical values. Partition
functions for 284 species of atoms for all elements from H to U are also
presented based on data collected at NIST. The calculated data are expected to
be useful for modelling a range of low density astrophysical environments,
especially star-forming regions, protoplanetary disks, the interstellar medium,
and planetary and cool stellar atmospheres. The input data, which will be made
available electronically, also provides a possible foundation for future
improvement by the community.Comment: 13 pages, 8 figures, 8 tables. Full tables 1, 2, 4, 5, 6, 7 and 8 to
be made available in electronic form at the CDS via anonymous ftp to
cdsarc.u-strasbg.fr (130.79.128.5) or via
http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A
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