Search results for " statistics"
showing 10 items of 1891 documents
2014
This paper proposes an observer-based robust guaranteed cost control method for thrust-limited rendezvous in near-circular orbits. Treating the noncircularity of the target orbit as a parametric uncertainty, a linearized motion model derived from the two-body problem is adopted as the controlled plant. Based on this model, a robust guaranteed cost observer-controller is synthesized with a less conservative saturation control law, and sufficient condition for the existence of this observer-based rendezvous controller is derived. Finally, an illustrative example with immeasurable velocity states is presented to demonstrate the advantages and effectiveness of the control scheme.
Measuring the social impact of research in Paediatric Dentistry: An Altmetric study.
2019
Background: Traditional metrics have been extensively used to evaluate the scientific performance. Despite being widespread accepted, citation-based metrics are not able to describe the social impact of research. A diverse metric, Altmetric, was proposed to overcome those limitations. Aim: This study aims to analyse the social impact of research in the field of paediatric dentistry and to assess if a correlation exists between the JCR citations, the AAS score, and the recently released Dimensions citation count. Design: A bibliometric study was conducted on the four journals related to Paediatric Dentistry listed in the JCR from 2014 to 2017. Descriptive statistics was used to describe the …
The Human Biodiversity in the Middle of the Mediterranean. Study of native and settlers populations on the Sicilian context
2020
[IT] Negli ultimi 200.000 anni, la specie umana si è diffusa in tutta la Terra, adattando la sua morfologia e fisiologia a un'ampia gamma di habitat. Lo scheletro umano ha quindi registrato i principali effetti ambientali e di conseguenza i reperti scheletrici assumono grande importanza nell'indagine dei processi evolutivi. Oggi le moderne tecniche di indagini quantitative delle principali caratteristiche morfologiche consentono di metterle in relazione con la variabilità genetica. La posizione geografica della Sicilia, l'isolamento e la sua lunga e dinamica storia di colonizzazione (diversi e numerosi contributi culturali e biologici) hanno creato un contesto peculiare che consente uno stu…
Graduate of Riga Polytechnic Institute, Athletics Statistician Andris Staģis
2020
The article summarizes the achievements of Andris Staģis, a graduate of the Faculty of Civil Engineering of Riga Polytechnic Institute (RPI; 1968), in the profession of an engineer, as well as reveals his contribution to the history and statistics of Latvian sports, achievements in athletics and their promotion. This is the first study on the activities and life of engineer, officer of the Order of the Three Stars, Latvian champion in athletics and the author of sports history books, and journalist A. Staģis. The aim of the research is to reveal the contribution of A. Staģis and the significance of his personality to Latvia using his and the authors’ personal archives, documents of the Stat…
Menores, víctimas directas de la violencia de género
2016
La violencia de género se suele ejercer en el ámbito privado o familiar, motivo por el cual, los hijos pueden considerarse tanto víctimas directas por sufrir violencia física o psicológica, como indirectas al ser testigos de la violencia ejercida sobre sus progenitoras por parte de la persona vinculada afectivamente. En los últimos años, y a pesar de los esfuerzos institucionales en aras de proteger a los menores, la violencia ejercida sobre los mismos ha elevado a 41 el número de víctimas mortales en España desde 2008 hasta septiembre de 2015. El objetivo del presente trabajo es divulgar la cifra de menores fallecidos víctimas de violencia de género, así como elaborar un posible perfil vic…
Análisis del riesgo de exclusión social en el medio rural: el índice Z como solución «lowcost» a la falta de indicadores sintéticos municipales
2019
Tras la crisis de 2008 el estudio de la exclusión social resulta un objeto recurrente para las investigaciones rurales. Pero las aproximaciones habituales suelen emplear perspectivas de análisis macro (como la tasa AROPE), algo inadecuado cuando el medio rural se caracteriza por su heterogeneidad. Si no reconocemos esta, difícilmente se puede lograr la inclusión social de los individuos y/o familias excluidas en este. Luego resulta clave evidenciar las diferencias territoriales de los fenómenos de exclusión social a nivel micro. Para ello trabajamos con la delimitación que de ruralidad emplean los PDR, y tomamos como casos de estudio los municipios de los GAL-LEADER de la provincia de Valen…
Predicting the environmental suitability for onchocerciasis in Africa as an aid to elimination planning
2021
Recent evidence suggests that, in some foci, elimination of onchocerciasis from Africa may be feasible with mass drug administration (MDA) of ivermectin. To achieve continental elimination of transmission, mapping surveys will need to be conducted across all implementation units (IUs) for which endemicity status is currently unknown. Using boosted regression tree models with optimised hyperparameter selection, we estimated environmental suitability for onchocerciasis at the 5 × 5-km resolution across Africa. In order to classify IUs that include locations that are environmentally suitable, we used receiver operating characteristic (ROC) analysis to identify an optimal threshold for suitabil…
Apolipoprotein E genotype does not influence the progression of multiple sclerosis
2003
OBJECTIVE: To investigate the association between apolipoprotein E (APOE) polymorphisms and the progression of MS. METHODS: We investigated 428 subjects affected by clinically defined MS, with a disease duration of at least three years. We collected data concerning the age at onset of MS, clinical type, disease duration and disability according to the expanded disability status scale (EDSS). We also calculated the progression index (PI) to evaluate disease progression. APOE genotyping and the -491 A/T polymorphism of the APOE promoter were determined. RESULTS: No association was observed between the APOE epsilon4 allele and clinical characteristics of our study population. We also investiga…
Association between the interleukin-1beta polymorphisms and Alzheimer's disease: a systematic review and meta-analysis.
2008
Abstract The pro-inflammatory cytokine interleukin(IL)-1β is a main component in inflammatory pathways and is overexpressed in the brain of Alzheimer's disease (AD) patients. Several studies report associations between IL-1β polymorphisms and AD, but findings from different studies are controversial. Our aim was to verify the correlation between the single nucleotide polymorphisms (SNPs) of the IL-1β, at sites − 511 and + 3953, and AD by meta-analysis. Computerized bibliographic searches of PUBMED and AlzGene database ( http://www.alzgene.org ) were supplemented with manual searches of reference lists. There is evidence for association between IL-1β + 3953 SNP and AD, with an OR = 1.60 (95%…
Revised risk estimation and treatment stratification of low- and intermediate-risk neuroblastoma patients by integrating clinical and molecular progn…
2014
Abstract Purpose: To optimize neuroblastoma treatment stratification, we aimed at developing a novel risk estimation system by integrating gene expression–based classification and established prognostic markers. Experimental Design: Gene expression profiles were generated from 709 neuroblastoma specimens using customized 4 × 44 K microarrays. Classification models were built using 75 tumors with contrasting courses of disease. Validation was performed in an independent test set (n = 634) by Kaplan–Meier estimates and Cox regression analyses. Results: The best-performing classifier predicted patient outcome with an accuracy of 0.95 (sensitivity, 0.93; specificity, 0.97) in the validation coh…