The problem of information overload is hot issue with growth of worldwide web. The need for the tools those should be able to absorb this huge information and eliminate this problem is evident especially for IR systems. Text is not a simple sequence of words but carries a structure. It is essential to handle these uncontrollable complex structures of sentence, grammatical and lexical irrelevanc...

On-line information retrieval systems often offer their users some means to tune the query to match the level of granularity of the information request. Users can be offered a far greater range of possibilities, however, if documents are indexed with coordinated index concepts. Coordinated index concepts are compound index concepts that express a relation between concepts that function as simpl...

This paper explores the effectiveness of index terms more complex than single words used in conventional information retrieval systems. Retrieval is performed in two phases. In the first phase, a conventional retrieval method (the Okapi system) is used and in the second phase, complex index terms such as syntactic relations and single words with part of speech information are introduced to rera...

1. Abstract We present an evaluation of domainindependent natural language tools for use in the identification of significant concepts in documents. Using qualitative evaluation, we compare three shallow processing methods for extracting

The extraction of the keywords that characterize each document in a given collection is one of the most important components of an Information Retrieval system. In this article, we propose to apply shallow parsing, implemented by means of cascades of finite-state transducers, to extract complex index terms based on an approximate grammar of Spanish. The effectiveness of the index terms extracte...

Using new data on market-based transactions we construct real estate price indexes for Manhattan between 1920 and 1939. During the 1920s prices reached their highest level in the third quarter of 1929 before falling by 67% at the end of 1932 and hovering around that value for most of the Great Depression. The value of high-end properties strongly co-moved with the stock market between 1929 and ...

We consider the question of how information from the textual context of citations in scientific papers could improve indexing of the cited papers. We first present examples which show that the context should in principle provide better and new

We continue the study of multidimensional operator multipliers initiated in [12]. We introduce the notion of the symbol of an operator multiplier. We characterise completely compact operator multipliers in terms of their symbol as well as in terms of approximation by finite rank multipliers. We give sufficient conditions for the sets of compact and completely compact multipliers to coincide and...

This paper explores the effectiveness of index terms more complex than single words in conventional information retrieval systems. Retrieval is performed in two phases. In the first phase, a conventional retrieval method (the Okapi system) is used and in the second phase, complex index terms such as syntactic relations and single words with part of speech information are introduced to rerank th...

Throughout the ground field is always supposed to be algebraically closed of characteristic zero. Let X be a smooth projective threefold of general type, denote by φm the m-canonical map of X which is nothing but the rational map naturally associated with the complete linear system |mKX |. Since, once given such a 3-fold X , φm is birational whenever m ≫ 0, thus a quite interesting thing is to ...