Carreira-Perpinan and Williams (2003) conjectured that a homoscedastic Gaussian mixture of M components in d 1 dimensions has at most M modes. Prof. J. J. Duistermaat (personal communication, 2003) provided the counterexample of a 3–component mixture in d = 2 where the Gaussians are located at the vertices of an equilateral triangle; for a certain range of variances modes are present near to th...

The problem of clustering data can be formulated as a graph partitioning problem. In this setting, spectral methods for obtaining optimal solutions have received a lot of attention recently. We describe Perron Cluster Cluster Analysis (PCCA) and establish a connection to spectral graph partitioning. We show that in our approach a clustering can be efficiently computed by mapping the eigenvector...

An accurate high performance liquid chromatography method for the separation and quantification of a solution mixture of nitrazepam, diazepam and medazepam and medazepam was developed. The modified simplex program has been utilized for the optimization of the chemical and chromatographic parameters using the chromatographic response function as the quality criterion and a photodiode array as a ...

normal 0 false false false en-us x-none ar-sa background: this study was aimed to evaluate protective and therapeutic effects of a specific mixture, containing vitamin c, lysine, proline, epigallocatechin gallate and zinc, as well as alpha-1-antitrypsin protein on lung tumorigenesis induced by benzo(a) pyrene (b (a) p) in mice. materials and methods: swiss albino mice were divided into two main...

This paper explores the interaction between conceptual structure and morpho-syntax. In particular, we show that ontology-based conceptual classification can be used to predict internal relations in compounds. We propose an ontology-based approach to predict the semantic relation between the two component words in Mandarin VV compounds. A Mandarin VV compound is classified according to the event...

Two masked priming experiments examined behavioural and event-related potential responses to simplex target words (e.g., flex) preceded by briefly presented, masked, derived word primes (flexible-flex), complex nonword primes formed by an illegal combination of the target word and a real suffix (flexify-flex), and simplex nonword primes formed by adding a nonsuffix word ending to the target (fl...

background: human pathogens that can cause infertility may also affect sperm count and quality. viral infections can be considered as direct and/or indirect cause of male factor infertility. objective: our goal was to investigate the prevalence of herpes simplex virus in the semen of infertile men attending the avicenna infertility clinic, and to compare it with the herpes virus serology result...