The bee genus Lasioglossum Curtis is a model taxon for studying the evolutionary origins of and reversals in eusociality. This paper presents a phylogenetic analysis of Lasioglossum species and subgenera based on a data set consisting of 1240 bp of the mitochondrial cytochrome oxidase I (COI) gene for seventy-seven taxa (sixty-six ingroup and eleven outgroup taxa). Maximum parsimony was used to...

The paper describes our participation in monolingual tasks at CLEF 2006. We have submitted results for the following languages: English, French, Portuguese and Hungarian. We focused on studying different weighting schemes (okapi and dfr) and retrieval strategies (passage retrieval and document retrieval) to improve retrieval performance. After an analysis of our experiments and of the official ...

Weighted Hosoya polynomials have been developed by Diudea, in ref. Studia Univ. "Babes-Bolyai", 2002, 47, 131-139. Among various weighting schemes, those polynomials obtained by using Diudea's Shell matrix operator are far more interesting. We present here the Shell-Distance and Shell-Degree-Distance polynomials and close formulas to calculate them and derived Cluj-Tehran CT index in the family...

This report describes the experiments we have conducted on the ad hoc retrieval task of Genomics track at TREC 2005. In the experiment, a number of different techniques were employed, including Porter stemming, MeSH term and gene name identification, Okapi, weighting schemes, query expansion, and concept-based ranking strategy. The results on sample topics are reported. Future improvements, suc...

We consider the problem of adaptation to the margin and to complexity in binary classification. We suggest an exponential weighting aggregation scheme. We use this aggregation procedure to construct classifiers which adapt automatically to margin and complexity. Two main examples are worked out in which adaptivity is achieved in frameworks proposed by Scovel and Steinwart (2004, 2005) and Tsyba...

This paper describes the language identification method presented in Twitter Language Identification Workshop (TweetLID-2014). The proposed method represents tweets by weighted character-level trigrams. We employed three different weighting schemes used in Text Categorization to obtain a numerical value that represents the relation between trigrams and languages. For each language, we add up th...

A novel block diagonalisation (BD)-based Multiuser multiple input multiple output (MU-MIMO)-aided relaying scheme is proposed for downlink transmissions, which does not require any channel state information at the base station (BS) and decomposes a MU-MIMO-aided relaying system into several parallel single-user MIMO-assisted relaying schemes. Furthermore, based on the proposed algorithm the opt...

This paper proposes two kinds of relevance measures to rank documents by geographic restriction: scope-based and type-based. The non-geographic and geographic relevance scores are combined using a weighted harmonic mean. The proposed relevance measures and weighting schemes are evaluated on GeoCLEF 2007 dataset with encouraging performance over the standard IR performance. The best performance ...

The CFO destroys the orthogonality among subcarriers and hence causes ICI in MIMO-OFDM systems. The ICI self-cancellation schemes, available in literature for SISO-OFDM systems, reduce the effect of ICI at the cost of spectral efficiency or system throughput. In this paper a new scheme is presented to reduce the effect of ICI with system throughput higher than that of ICI self-cancellation sche...

This article classifies petrol retail companies in Spain based on their financial ratios using the compositional data analysis (CoDA) methodology. methodology solves most common distributional problems encountered statistical of ratios. The main purpose this is to show that with CoDA methodology, accounting figures presenting low values can have a disproportional influence classification. probl...