Search results for "Variable"
showing 10 items of 1674 documents
Optimization of Linearized Belief Propagation for Distributed Detection
2020
In this paper, we investigate distributed inference schemes, over binary-valued Markov random fields, which are realized by the belief propagation (BP) algorithm. We first show that a decision variable obtained by the BP algorithm in a network of distributed agents can be approximated by a linear fusion of all the local log-likelihood ratios. The proposed approach clarifies how the BP algorithm works, simplifies the statistical analysis of its behavior, and enables us to develop a performance optimization framework for the BP-based distributed inference systems. Next, we propose a blind learning-adaptation scheme to optimize the system performance when there is no information available a pr…
Modeling and Mitigating Errors in Belief Propagation for Distributed Detection
2021
We study the behavior of the belief-propagation (BP) algorithm affected by erroneous data exchange in a wireless sensor network (WSN). The WSN conducts a distributed multidimensional hypothesis test over binary random variables. The joint statistical behavior of the sensor observations is modeled by a Markov random field whose parameters are used to build the BP messages exchanged between the sensing nodes. Through linearization of the BP message-update rule, we analyze the behavior of the resulting erroneous decision variables and derive closed-form relationships that describe the impact of stochastic errors on the performance of the BP algorithm. We then develop a decentralized distribute…
Critical power and anaerobic work capacity at high altitude (HA)
2009
The home literacy model in a highly transparent orthography
2019
We investigated the extent to which home literacy activities during the preschool year would predict the development of children’s language and literacy skills in primary school, in a highly transparent Finnish language. Also, the correlates of maternal literacy activities during preschool were examined. Literacy and language skills of 1,880 children (6-year-olds at the baseline) were tested at 5 time points from the beginning of preschool to the end of Year 2; mothers filled in questionnaires at the end of preschool. The results showed that home teaching of reading at preschool age predicted children’s emergent literacy (letter knowledge, word reading fluency) in primary school, while shar…
Variables cognitives i factors de personalitat dels subjectes amb millor control d’una Interfície Cervell Computadora
2022
Objectiu :La interrelació entre l’humà i la màquina en una tasca amb una Interficie Cervell-Computadora ( BCI de les sigles en anglès) es especialment transcendental. Hi ha subjectes incapaços d’aprendre a manipular-la( Illiteracy). El present treball analitza la influència del tipus de paradigma de control , les habilitats atencionals , els trets de personalitat i la resposta d’afrontament de la resposta davant el fracàs a l'hora d’utilitzar-la. Mètode: Hem emprat dues mostres de 89 i 191 estudiants de 1er i 2n curs de la Universitat de València en dos estudis consecutius els anys 2016 i 2017. S’han aplicat test de personalitat i qüestionaris sobre activitats rutinàries, avaluació atencion…
Self-Efficacy Between Previous and Current Mathematics Performance of Undergraduate Students: An Instrumental Variable Approach to Exposing a Causal …
2021
PurposeSelf-efficacy has been argued theoretically and shown empirically to be an essential construct for students’ improved learning outcomes. However, there is a dearth of studies on its causal effects on performance in mathematics among university students. Meanwhile, it will be erroneous to assume that results from other fields of studies generalize to mathematics learning due to the task-specificity of the construct. As such, attempts are made in the present study to provide evidence for a causal relationship between self-efficacy and performance with a focus on engineering students following a mathematics course at a Norwegian university.MethodThe adopted research design in the presen…
Viittomakielet hybridisysteemeinä - hämärärajaisuus ja epäkonventionaalisuus osana viittomakielten rakennetta
2018
Tässä artikkelissa tarkastellaan hämärärajaisuutta ja epäkonventionaalisuutta osana joitakin kaikista viittomakielistä löydettyjä yksiköitä ja rakenteita ja niiden käyttöä. Täsmällisemmin artikkelin fokuksessa ovat tietyt muodoltaan ja merkitykseltään tilanteisesti muuntuvat viittomat (erityisesti niin kutsutut osittain leksikaaliset viittomat) sekä eräänlainen vaihteleva-asteinen näytteleminen (niin kutsuttu konstruoitu toiminta), jota viittojat käyttävät tuottamiensa syntaktisten rakenteiden osana ja niiden sijaan. Käytännössä artikkeli esittelee näkemyksen, jonka mukaan molemmissa tarkastelun kohteena olevissa ilmiöissä on kyse samasta asiasta eli kielen diskreettien ja konventionaaliste…
The feasibility of working memory tablet tasks in predicting scholastic skills in classroom settings
2019
Cognitive assessment in natural group settings facilitates data collection but poses threats to the validity. In this study, tablet‐based working memory (WM) tasks, the counting span, and reading span were used in predicting 12‐year‐old children's (N = 837) scholastic skills and fluid intelligence in a classroom with environmental noise. WM tasks had excellent internal consistency, correlated with scholastic skills, and accounted for more of the variance in cognitive performance (grade point average, fluid intelligence, scholastic skills) compared with individually administered (n = 190) digit span task. Furthermore, the multilevel analysis revealed that compared with the classrooms with no…
The Latent Factors Behind the Urban Travel Behaviour
2014
Abstract This research aims to explore the impact of latent variables, mirroring the users’ preferences, on the individual decision making process regarding the mode of transport. The paper describes the first results of an ongoing research activity, which derives from a pilot study carried out in Palermo. The authors have administered to a sample of travellers a questionnaire and they simulated the mode choice behaviour referring to the random utility theory. Then the transport demand over the entire area of Palermo has been studied in order to design the cordon pricing scenario with the application of an additional cost on private car dedicated to a selected area of the historic centre of…
El papel de la reputación del Consejero Delegado en la reputación de la empresa española
2010
La reputación corporativa se conceptúa como la estimación global de las percepciones que tienen de la empresa sus principales stakeholders. La literatura ha visto en la reputación corporativa uno de los activos intangibles más valioso desde el punto de vista de la creación y sostenimiento de ventajas competitivas, por lo que diversos estudios han tratado de identificiar los antecedentes de la reputación de la empresa. Uno de estos antecedentes destacado son sus directivos, y entre ellos los Consejeros Delegados. En España, los trabajos sobre los antecedentes de la reputación corporativa son muy escasos, e inexistentes los que han abordado el estudio de la influencia de la reputación del Con…