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The early prediction of mortality is one of the unresolved tasks in intensive care medicine. This contribution models medical symptoms as observations cased by transitions between hidden markov states. Learning the underlying state transition probabilities results in a prediction probability success of about 91%. The results are discussed and put in relation to the model used. Finally, the rationales for using the model are reflected: Are there states in the septic shock data?
This article examines the expression of natural gender in Icelandic nouns denoting human beings. Particular attention will be paid to the system's symmetry with regards to nouns denoting women and men. Our society consists more or less exactly of half women and half men. One would therefore assume that systems for terms denoting persons would also be symmetrically organised. Yet this assumption could not be further from the truth, and not just in single isolated cases, but in many languages: I will attempt to show that Icelandic has numerous methods for referring to women, but also many barriers and idiosyncrasies.
The present study poses the question on what phonetic and phonological grounds postalveolar fricatives in Polish can be analyzed as retroflex and whether postalveolar fricatives in other Slavic languages are retroflex as well. Velarization and incompatibility with front vowels are introduced as articulatory criteria for retroflexion, based on crosslinguistic data. According to these criteria, Polish and Russian have retroflex fricatives, whereas Bulgarian and Czech do not. In a phonological representation of these Slavic retroflexes, the necessity of perceptual features is shown. Lastly, it is illustrated that palatalization of retroflex fricatives both in Slavic languages and more generally causes a phonetic and phonological change to a non-retroflex sound.
Vortrag gehalten an der Tagung "The XVI International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, organized by SUBATECH Laboratory", in Nantes, France, 18-24 Juli 2002.
Düsseldorf is the capital of North Rhine-Westphalia, the state with the highest number of inhabitants in Germany. The city has a rich cultural history: The theatre history started in 1485 (the festivities in the context of a princely marriage at Düsseldorf). Theatre historiography marks three great periods for Düsseldorf (Immermann, 1834-1837; Dumont-Lindemann, 1905-1933; Gründgens, 1947-1955). The city has a long history of involvment with film, too. For instance the first German film journal „Der Kinematogaph“ began publishing here in 1907. Düsseldorf became after 1945 a distribution center and served for decades as site of all major German and foreign distributors‘ headquartes. It offers still a lot of cultural events: performing arts in different forms (theatre at the Düsseldorfer Schauspielhaus, musical at the Capitol, opera and ballet at the German Opera Düsseldorf-Duisburg, dance at the Tanzhaus (Dance House) North Rhine-Westphalia, free and independant theatre groups, private theatres, cinema, media, museums, cultural institutions, representing other countries like France, Poland ...
Rating agencies state that they take a rating action only when it is unlikely to be reversed shortly afterwards. Based on a formal representation of the rating process, I show that such a policy provides a good explanation for the puzzling empirical evidence: Rating changes occur relatively seldom, exhibit serial dependence, and lag changes in the issuers’ default risk. In terms of informational losses, avoiding rating reversals can be more harmful than monitoring credit quality only twice per year.
In the last years, much effort went into the design of robust anaphor resolution algorithms. Many algorithms are based on antecedent filtering and preference strategies that are manually designed. Along a different line of research, corpus-based approaches have been investigated that employ machine-learning techniques for deriving strategies automatically. Since the knowledge-engineering effort for designing and optimizing the strategies is reduced, the latter approaches are considered particularly attractive. Since, however, the hand-coding of robust antecedent filtering strategies such as syntactic disjoint reference and agreement in person, number, and gender constitutes a once-for-all effort, the question arises whether at all they should be derived automatically. In this paper, it is investigated what might be gained by combining the best of two worlds: designing the universally valid antecedent filtering strategies manually, in a once-for-all fashion, and deriving the (potentially genre-specific) antecedent selection strategies automatically by applying machine-learning techniques. An anaphor resolution system ROSANA-ML, which follows this paradigm, is designed and implemented. Through a series of formal evaluations, it is shown that, while exhibiting additional advantages, ROSANAML reaches a performance level that compares with the performance of its manually designed ancestor ROSANA.
Glue semantics for HPSG
(2002)
The glue approach to semantic interpretation has been developed principally for Lexical Functional Grammar. Recent work has shown how glue can be used with a variety of syntactic theories and this paper outlines how it can be applied to HPSG. As well as providing an alternative form of semantics for HPSG, we believe that the benefits of HPSG glue include the following: (1) simplification of the Semantics Principle; (2) a simple and elegant treatment of modifier scope, including empirical phenomena like quantifier scope ambiguity, the interaction of scope with raising, and recursive modification; (3) an analysis of control that handles agreement between controlled subjects and their coarguments while allowing for a property denotation for the controlled clause; (4) re-use of highly efficient techniques for semantic derivation already implemented for LFG, and which target problems of ambiguity management also addressed by Minimal Recursion Semantics.
I present a treatment of the Dutch R-pronouns in HPSG drawing on Linearization Theory as developed in Reape (1996) and Kathol (1995,2000). R-pronouns in Dutch are a set of locatives which also serve as pronominal arguments of prepositions, and as such may form non-local dependencies. Linearization and techniques of domain union, compaction and partial compaction allow for a straightforward analysis of these dependencies. I focus my analysis on the light R-pronoun er, and its iteration with two homophonous items, the quantitative and expletive ers.
Using the sign/construction distinction developed in Donohue and Sag (1999) and Sag (2001), I implement Kathol's notion of partial compaction in constraints on constructions of type prepositional-phrase, noun-phrase, etc. This places the phonological content of the R-pronoun or quantitative er in the DOMAIN list as a free agent, able to appear in the clause disconnected from the original selector. This use of linearization also permits a haplology rule to capture the idiosyncratic co-occurrence behavior that occurs when multiple functions of er appear together within a clause.
This paper proposes an HPSG account of the French tense and aspect system, focussing on the analysis of the passé simple (simple past) and imparfait (imperfective) tenses and their interaction with aspectually sensitive adjuncts. Starting from de Swart's (1998) analysis of the semantics of tense and aspect, I show that while the proposed semantic representations are appropriate, the analysis of implicit aspectual operators as coercion operators is inadequate.
The proposed HPSG analysis relies on Minimal Recursion Semantics to relate standard syntactic structures with de Swart-style semantic representations. The analysis has two crucial features: first, it assumes that the semantic contribution of tense originates in the verb's semantic representation, despite the fact that tense can get wide scope over other semantic elements. Second, it allows the occurrence of implicit aspectual operators to be controlled by the verb's inflectional class, which accounts for their peculiar distribution.
Departing from the exhaustive indexation, syntax-driven approach to binding, we argued for an alternative, semantics-oriented rationale for binding principles. Under this new understanding of the nature of grammatical constraints on anaphoric binding, these principles are viewed as contributing to circumscribe the contextually determined semantic value of anaphoric nominals. This conceptual shift helps to find a fully fledged formal specification of binding principles with the HPSG lean description formalism where these constraints are entered in the grammar as part of the information kept at the lexical entries of anaphoric expressions.
One of the controversial issues in English stylistic inversion (SI) construction (e.g., Into the room walked a woman) is the functional status of preverbal PP and postverbal NP. Based on the distributional parallels among the PP, NP, ordinary subject and topic, this paper proposes that the PP in SI has a dual function as a subject and topic, while the NP also has some subject properties that the PP does not have. These mixed functional properties of the PP and the 'double' subject properties of SI are analyzed in the theory of HPSG, especially with the versions recently developed by Sag 1997, Manning and Sag 1999 and Ginzburg and Sag 2001, which posit the notions of the multiple type inheritance hierarchy and dissociation between the argument and valence structures. This analysis claims that the SI construction needs to simultaneously satisfy two general, independent constraints, head-subject-phrase and head-filler-phrase, as well as the construction specific lexeme-level constraint. This view suggests that the English SI construction is an instance of peripheral phenomena whose construction specific constraints are inherited from more general core constraints.
(Ingria 1990)'s claims that both feature neutrality, where a sign acts in a sentence as though it simultaneously had multiple values for a single feature, and the coordination of unlike categories, where the features of two or more conjuncts differ from each other, pose fundamental problems for unification-based theories of grammar do not apply to constraint-based theories like HPSG.
New types can be introduced into the hierarchy of appropriate values for any given feature that directly represent neutralizations and coordinations. In this manner, feature neutralization and the coordination of unlikes are seen to be different aspects of the same problem: how to determine the values of a coordinate mother's features from those of its conjuncts.
This paper challenges the assumption that the nature of apparent word order and verb form irregularities in the German verbal complex is that of an irreducible cluster of idiosyncrasies surrounding an exceptional word order possibility. I discuss two lesser known sets of data which raise serious problems for the traditional 'idiosyncrasy-based' analysis. I conclude that the verbs in the upper-field are exceptional in a 'deeper' sense, in that they do not construct as ordinary syntactic heads. Instead they seem to behave more like functional elements as characterized by Abney (1987). On the basis of such a revised syntactic analysis most of the unexpected word order and verb form irregularities resurface as related regular properties.
This paper investigates the syntax of head-marking constructions, specifically those with nominals heads. The data are drawn from Luiseño, a Uto-Aztecan language from Southern California. The first construction involves the morphological marking of possessors on possessed nouns. I show that a natural account can be given if possessed nouns are considered lexeme-level expressions derived from underspecified nominal lexemes. A separate mapping is responsible for relating nouns (possessed or unpossessed) to fully case-inflected word-level expressions. I then show how elements of this analysis can be adapted to account for periphrastic expressions of oblique cases with animate nouns. In such cases, the head is a case-inflected pronominal head that takes a full noun phrase as an optional specifier. I conclude with some remarks on the relationship between the proposed analysis for nominal head-marking constructions and the treatment of nonconfigurational properties more generally.
In this paper, we use lattice theory to present an account of neutralization and coordination of unlikes that can easily be incorporated into current HPSG, where linguistic objects are modelled as totally well-typed, sort resolved feature structures. The account draws on the analysis of Levy 2001 and is consistent with the HPSG analysis of neutralization proposed by Levine et al. 2001. We show the essential properties required of a coordination/neutralization lattice, and argue that our analysis is the minimal lattice satisfying these requirements. The HPSG-based account of the same phenomena presented in Daniels 2001 of this collection is shown by lattice-theoretic methods to be essentially equivalent to ours.
Case-matching effects in in German VP coordination and German free relatives have received a fair amount of attention in recent syntactic theorizing and have been cited by Ingria (1990) as a potential challenge to constraint-based and unification-based approaches to syntax such as HPSG and LFG.
This paper considers another construction in question: case-matching phenomena in Bavarian relative clauses, for which Bayer (1983) develops an inherently derivational account. The present paper offers a purely declarative account of Bavarian relative clauses in HPSG and shows that the analytical tools provided by unification-based or constraint-based grammar formalisms completely suffice to provide a fully adequate and comprehensive analysis of the data.