Elżbieta Hajnicz

Extended phraseological information in a valence dictionary for NLP applications

The aim of this paper is to propose a far-reaching extension of the phraseological component of a valence dictionary for Polish. The dictionary is the basis of two dierent parsers of Polish; its format has been designed so as to maximise the readability of the information it contains and its re-applicability. We believe that the extension proposed here follows this approach and, hence, may be an inspiration in the design of valence dictionaries for other languages.

Similarity-Based method of detecting diathesis alternations in semantic valence dictionary of polish verbs

In order to create semantic valence dictionary, in which semantically related syntactic verb schemata are connected, the information of diathesis alternations of verbs is needed. In this paper, first experiments concerning a method of automatic detection of alternation base on similarity between semantically interpreted (by means of selectional preferences) verb frames are presented.

Problems with Pruning in Automatic Creation of Semantic Valence Dictionary for Polish

In this paper we present the first step towards the automatic creation of semantic valence dictionary of Polish verbs. First, resources used in the process are listed. Second, the way of gathering corpus-based observations into a semantic valence dictionary and pruning them is discussed. Finally, an experiment in the application of the method is presented and evaluated.

Semantic Annotation of Verb Arguments in Shallow Parsed Polish Sentences by Means of the EM Selection Algorithm

The ultimate goal of our work is to extend a syntactic valence dictionary of Polish verbs by adding some semantic information to verb arguments. This information consists of wordnet semantic categories of words. In order to provide syntactic slots of dictionary entries with lists of appropriate semantic categories of corresponding nouns, we need a treebank with all nouns semantically annotated with such categories, as both syntactic (i.e., argument structure) and semantic information is required. We aim here at Word Sense Disambiguation (WSD). To solve this task for our specific application, we adapt EM selection algorithm elaborated for extraction of syntactic valence frames. In the paper, the whole process of data processing is shown. The main focus is put on WSD task. Three versions of the EM selection algorithm are presented: the original one and its two modifications. Finally, the evaluation and comparison of the algorithms is performed.

Absolute dates and relative dates in an inferential system on temporal dependencies between events

In this paper a calculus of relations between intervals and points is recalled. The notions of absolute and relative dates are introduced and their application in an inferential system is described. The notions of the current moment (now) and event duration are discussed by means of the concept of relative dates.

Mapping Named Entities from NKJP Corpus to Składnica Treebank and Polish Wordnet

In this paper a method of mapping named entities from NKJP corpus, where their annotation is rather coarse, to Skladnica treebank, where their annotation is wordnet-based, is discussed. The method is based on the fact that Skladnica is a subcorpus of the one-million-word manually annotated balanced subcorpus of NKJP. The method to find a corresponding node in a parse tree is presented. Next, several heuristics to match the lemma of an NE in Polish Wordnet and to choose the most probable semantic interpretation of ambiguous ones are suggested. The results of the mapping are evaluated.

Some considerations on non-linear time intervals

Most of the descriptions of interval time structures in the first order predicate calculus are based on linear time. However, in the case of intervals, abandoning the condition oflinearity (e.g.LIN in van Benthems systems) is not sufficient. In this paper, some properties of non-linear time structures are discussed. The most important one is the characterization of location of intervals in a fork of branches. This is connected with the fact that an interval can contain non-collinear subintervals. As a result of non-linearity, some basic properties of interval structures must be formulated in a weaker form. Moreover, time must be filled by intervals to indicate that time cannot pass without events occurring in it. Finally, it is shown that when intervals cannot contain non-collinear subintervals, most of the conditions described in the paper are satisfied.

A formalization of absolute and relative dates based on the point calculus

Abstract In this paper we present a formalization of absolute and relative dates based on a formalization of the point calculus. We discuss three extensions of the point calculus, namely absolute dates, relative dates and both kinds of dates. An approach to translate the point calculus with relative dates to a tense logic is suggested.

Another approach to formalizing the point and interval calculus

Abstract In this paper a formalization of point calculus (Vilain & Kautz) and interval calculus (Allen) is presented. Semantics for this formalization is based on the point and interval temporal structures described by van Benthem. Finally, and attempt to translate these calculi into the instant tense logic and the extended tense logic accordingly is suggested.

Grouping alternating schemata in semantic valence dictionary of polish verbs

In this paper a method for grouping semantically related schemata is proposed. It is based on the participation of verbs in diathesis alternations. The process of aggregating schemata in four steps is presented.