Information retrieval is the selection of documents relevant to a query. Inverted index is the conventional way to store the index of the collection. Because of the large amounts of data, compression techniques are commonly used in information retrieval systems to reduce the size of the inverted index. We experimentally evaluate the result of the mapping of such techniques on the Compressed Spa...

In this paper a variant of partially mapped crossover (VPMX) is designed using cut point positions and is tested for its performance with the existing partially mapped crossover (PMX).In order to test the performance ,two mutation operators are used. These mutation operators are inverted displacement and inversion mutations. Partially mapped crossover (PMX) with inversion and with inverted disp...

The Enders and Granger (1998) unit-root test against stationary alternatives with asymmetric adjustment is applied to the extended Nelson and Plosser dataset. The test rejects roughly as frequently as does the ADF test on these data. In only one of these cases, for the S&P500 index, does further testing suggest that the adjustment mechanism is asymmetric.

We examined the relationship between satellite measurements of solar-induced chlorophyll fluorescence (SIF) and several meteorological drought indices, including the multi-time-scale standard precipitation index (SPI) and the Palmer drought severity index (PDSI), to evaluate the potential of using SIF to monitor and assess drought. We found significant positive relationships between SIF and dro...

The traditional measure of market power is the HHI, which gives implausible results given the low elasticity of demand in electricity spot markets, unless it is adapted to take account of contracting. In its place the Residual Supply Index has been proposed as a more suitable index to measure potential market power in electricity markets, notably in California and more recently in the EU Sector...

Ranking techniques are effective at finding answers in document collections but can be expensive to evaluate. We propose an evaluation technique that uses early recognition of which documents are likely to be highly ranked to reduce costs; for our test data, queries are evaluated in 2% of the memory of the standard implementation without degradation in retrieval effectiveness. cpu time and disk...

Document-centric static index pruning methods provide smaller indexes and faster query times by dropping some within-document term information from inverted lists. We present a method of pruning inverted lists derived from the formulation of unigram language models for retrieval. Our method is based on the statistical significance of term frequency ratios: using the two-sample two-proportion (2...

The aim of the study is to review current trends in English Language Teaching (ELT) technologies and methodologies to analyze affordances of an approach proposed by Finardi (in press) and called the Inverted CLIL approach. With that aim, the study reviews ELT technologies and methodologies in general and the Content and Language Integrated Learning (CLIL) approach with the use of Massive Online...

A query algebra is presented that expresses searches on structured text. In addition to traditional full-text boolean queries that search a pre-defined collection of documents, the algebra permits queries that harness document structure. The algebra manipulates arbitrary intervals of text, which are recognized in the text from implicit or explicit markup. The algebra has seven operators, which ...

The article describes a new data structure called neuro-index. It is an alternative to wellknown file indexes. The neuro-index is fundamentally different because it stores weight coefficients in neural network. It is not a reference type like ”keyword–position in a file”.