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11 articles for “positive definite”
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Research ArticleOpen accessIn the keywordsMathematical Genesis of the Spatio-Temporal Covariance FunctionsGema Fernández-Avilés, Jose-María Montero, Jorge MateuProblem statement: Obtaining new and flexible classes of nonseparable spatio-temporal covariances have resulted in a key point of research in the last years within the context of spatiotemporal Geostatistics. Approach: In general, the literature has focused on the problem of full symmetry and the problem of anisotropy has been overcome. Results: By exploring mathematical properties of positive definite functions and … …Journal of Mathematics and Statistics, Vol. 7, Issue 1 · 31 Jan 2011 · 7,938 accessesView PDFCite
Research ArticleOpen accessIn the keywordsInversion of Covariance Matrix for High Dimension DataSamruam ChongcharoenProblem statement: In the testing statistic problem for the mean vector of independent and identically distributed multivariate normal random vectors with unknown covariance matrix when the data has sample size less than the dimension n≤p, for example, the data came from DNA microarrays where a large number of gene expression levels are measured on relatively few subjects, the p×p sample … …Journal of Mathematics and Statistics, Vol. 7, Issue 3 · 27 Jul 2011 · 7,869 accessesView PDFCite
Research ArticleOpen accessIn the abstractExterior and Body Types of Cows with Different Levels of Dairy ProductivityDastanbek Asylbekovich Baimukanov, Anuarbek Temirbekovich Bissembayev, Stepan Dmitrievich Batanov et al.The research aimed to study the dynamics of changes in the selection and genetic parameters of the body, to determine the relationship between the productive qualities and the exterior of cows in the population of Holsteinized black-and-white and Kholmogory cattle of the Udmurt Republic. Cows with a productivity level of more than 8000 kg of milk for 305 days of … …American Journal of Animal and Veterinary Sciences, Vol. 17, Issue 2 · 8 Jun 2022 · 6,013 accessesView PDFCite
Research ArticleOpen accessIn the abstractClinical Analysis of Pulmonary Mycobacterium kansasii DiseaseYoshihiro Kobashi, Masaaki Abe, Daisuke Yoshioka et al.To investigate the clinical aspects of pulmonary Mycobacterium kansasii (M. kansasii) disease. In 25 patients who satisfied the diagnostic criteria of the American Thoracic Society, we retrospectively evaluated the background, diagnostic methods, laboratory findings, radiological findings, treatment and prognosis. The median age was 61 years old (20 males, 5 females). Nine patients (36%) had no underlying diseases. The definite diagnosis … …American Journal of Infectious Diseases, Vol. 16, Issue 1 · 21 Jan 2020 · 7,111 accessesView PDFCite
Research ArticleOpen accessIn the abstractImpact Assessment of Soil Contamination with Antibiotics (for Example, an Ordinary Chernozem)Yuliya Viktorovna Akimenko, Kamil Shagidullovich Kazeev, Sergey Ilyich KolesnikovThe environmental behavior of antibiotics is not well known and the precise environmental risk assessment is not practical. We studied the impact antibiotics (benzylpenicillin, pharmasin and nystatin) at different concentrations (100 and 600 mg kg-1) on population densities of microorganisms and enzymatic activity of ordinary chernozems in model experiments. The applied doses of antibiotics had definite suppressing effects on population … …American Journal of Applied Sciences, Vol. 12, Issue 2 · 29 Apr 2015 · 7,852 accessesView PDFCite
Research ArticleOpen accessIn the abstractPROCALCITONIN AS A MARKER FOR EARLY DIAGNOSIS OF SEPSISRahim Raoofi, Zahra Salmani, Fatemh Moradi et al.Sepsis is a critical condition often caused by bacterial infection and associated with death and mortality. The prognosis of this disease depends on early diagnosis and proper treatment. Definite diagnosis of sepsis is positive blood culture and this test needs a long time to perform, so other biochemical parameters such as procalcitonin serum level has been introduced. To determine sensitivity, … …American Journal of Infectious Diseases, Vol. 10, Issue 1 · 23 Dec 2013 · 7,476 accessesView PDFCite
Research ArticleOpen accessIn the abstractChlamydia trachomatis in Women with Full-Term Deliveries and Women with AbortionAbdolreza Sotoodeh Jahromi, Mohammad Reza Farjam, Farideh Mogharrab et al.Problem statement: There are some documents which support the role of some certain infections such as Chlamydia trachomatis in spontaneous abortion. As there were not data about role this bacterium in abortion in this area of IRAN, this study was conducted to evaluate the prevalence of Chlamydia trachomatis in women with abortion and compare it with healthy women with no … …American Journal of Infectious Diseases, Vol. 6, Issue 3 · 30 Sep 2010 · 8,516 accessesView PDFCite
Research ArticleOpen accessIn the abstractSpecialization of Recursive Predicates from Positive Examples OnlyMoussa DembaProblem statement: Given an overly general (definite) program P and its intended semantics Φ (the programmer’s intentions) where P does not satisfy Φ, find out a new version P’ of P such that P’ satisfies Φ. Approach: We proposed an approach for correcting overly general programs from positive examples by exploiting program synthesis techniques. The synthesized program, P’, is a … …Journal of Computer Science, Vol. 6, Issue 6 · 30 Jun 2010 · 6,854 accessesView PDFCite
Research ArticleOpen accessIn the abstractCytomegalovirus Immunity in Pregnancy in South of IranAbdolreza Sotoodeh Jahromi, Mahin Jamshidi Makiani, Mohammad Reza Farjam et al.Problem statement: Fetal loss and abortion are responsible for significant emotional distress for couples desiring children. There are many documents which support the role of some certain asymptomatic infections such as Cytomegalovirus (CMV) in spontaneous abortion. This study was aimed to evaluate the prevalence of seropositivity for CMV IgG and IgM in women with abortion and compare it with normal … …American Journal of Infectious Diseases, Vol. 6, Issue 1 · 31 Mar 2010 · 8,145 accessesView PDFCite
Research ArticleOpen accessIn the abstractMemoryless Modified Symmetric Rank-One Method for Large-Scale Unconstrained OptimizationFarzin Modarres, Malik Abu Hassan, Wah June LeongProblem statement: Memoryless QN methods have been regarded effective techniques for solving large-scale problems that can be considered as one step limited memory QN methods. In this study, we present a scaled memoryless modified Symmetric Rank-One (SR1) algorithm and investigate the numerical performance of the proposed algorithm for solving large-scale unconstrained optimization problems. Approach: The basic idea is to apply … …American Journal of Applied Sciences, Vol. 6, Issue 12 · 31 Dec 2009 · 7,981 accessesView PDFCite