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Lidia M. Pivovarova Saint-Petersburg State University The Ph.D. advisor: prof. Valery Sh. Rubashkin NLDB 2008

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FACTORS - - the system designed to monitor underling characteristics of a subject domain

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General System Description The Ontology TEXTS Lemmatization, part-of-speech tagging, semantic mark-up Morph. analyzer Semantic analyzer Situation State Search Patterns

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The Factors <ul><li>Factors – the required information aspects. </li></ul><ul><li>~ 100 factors </li></ul><ul><li>Factors: </li></ul><ul><li>- qualitative </li></ul><ul><li>e.g. social tension , investment attractiveness, </li></ul><ul><li>level of sovereignty, human rights activity </li></ul><ul><li>- quantitative </li></ul><ul><li>e.g. the number of unemployed, an average salary, </li></ul><ul><li>the inflation level, the ammount of import </li></ul>

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Numerical values <ul><li>Qualitative factors: </li></ul><ul><li>very small , small , less than average , average, more than average , large , very large . </li></ul><ul><li>Quantitative factors: </li></ul><ul><li> the number + <unit> </li></ul><ul><li> e. g. </li></ul><ul><li> an average salary –> monetary unit (ruble, $, … ) </li></ul><ul><li> the number of unemployed -> no units </li></ul><ul><li> </li></ul>

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The Patterns <ul><li>Qualitative factors ->“factor + numerical value” patterns. </li></ul><ul><li>e. g. Social tension <-- spontaneous meeting (large) </li></ul><ul><li>Quantitative factors -> “only factor” patterns. </li></ul><ul><li>e. g. The number of unemployed <-- become unemployed </li></ul><ul><li>Search algorithm </li></ul><ul><li>1) find a pattern </li></ul><ul><li>2) find a number + unit </li></ul><ul><li>if not </li></ul><ul><li>3) find words large, small, increase, decrease etc. </li></ul>

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Pattern Formation Process <ul><li>Pattern is a set of words and ontology concepts. </li></ul><ul><li>Ontology provides: </li></ul><ul><li>- pattern generalization </li></ul><ul><li>- synonym accumulation </li></ul><ul><li>- information about units </li></ul><ul><li>Pattern formation: user marks relevant fragment in a text or chooses concept from the ontology. </li></ul>

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Example <ul><li>As is known, European Union strictly demanded Latvia to close the both generating units of Ignalinskaya nuclear power station. It is also promised to remit 3 billions euro for this goal. </li></ul><ul><li>Factors: </li></ul><ul><li>The EU pressure to Latvia. </li></ul><ul><li>The financial aid of EU to Latvia. </li></ul>