Browsing by Autor "Ricardo Grau"

Now showing 1 - 6 of 6

A Correlation-Based Distance Function for Nearest Neighbor Classification
(Springer Science+Business Media, 2008) Yanet Rodríguez Sarabia; Bernard De Baets; María M. García; Carlos Morell; Ricardo Grau
A reinforcement learning approach to coordinate exploration with limited communication in continuous action games
(Cambridge University Press, 2016) Abdel Rodríguez; Peter Vrancx; Ricardo Grau; Ann Nowé
Abstract Learning automata are reinforcement learners belonging to the class of policy iterators. They have already been shown to exhibit nice convergence properties in a wide range of discrete action game settings. Recently, a new formulation for a continuous action reinforcement learning automata (CARLA) was proposed. In this paper, we study the behavior of these CARLA in continuous action games and propose a novel method for coordinated exploration of the joint-action space. Our method allows a team of independent learners, using CARLA, to find the optimal joint action in common interest settings. We first show that independent agents using CARLA will converge to a local optimum of the continuous action game. We then introduce a method for coordinated exploration which allows the team of agents to find the global optimum of the game. We validate our approach in a number of experiments.
Building Fine Bayesian Networks Aided by PSO-Based Feature Selection
(Springer Science+Business Media, 2007) María del Carmen Chávez; Gladys Casas; Rafael Falcón; Jorge Moreira; Ricardo Grau
Efectividad de hongos entomopatógenos en el manejo de Pseudacysta perseae (Heid.) (Hemiptera: Tingidae) en aguacate (Persea americana Mill.) Effectiveness of entomopathogenic fungi in the management of Pseudacysta perseae (Heid.) (Hemiptera: Tingidae) in avocado (Persea americana Mill.)
(2012) Lilián Morales Romero; Horacio Grillo Ravelo; Nilo Maza Estrada; Ricardo Grau; Villa Clara
The avocado lace bug Pseudacysta perseae (Heid.) constitutes the most important pest in avocado plantations in Cuba. The objective of this paper was to evaluate the entomopathogenic fungi effectiveness in the pest management of avocado plantations. Applications of Beauveria bassiana (Bals.) Bull., Metarhizium anisopliae (Metsch.) Sorok., and Lecanicillium (= Verticillium) lecanii (Zimm.) Zare & Gams (4 l/tree and conidia 4x10 11 /tree) in field conditions provided protection 92 days after application (DAA) in more than 70% of biological effectiveness. The biological application effectiveness was shown in ascending way between 16 and 30 DAA. At 30 dda, all treatments showed a biological efficacy exceeding 90%. The adult populations and lace bug nymphs were lower in trees treated with entomopathogenic fungi in relation to the control. The susceptibility of P. perseae populations to entomopathogenic fungi provides guidelines for the possible implementation of an ecological strategy to control the lace bug.
Making Connections for Our Changing Mountains: Future Directions for the Mountain Research Initiative (MRI)
(International Mountain Society, 2020) Carolina Adler; Jörg Balsiger; Adrienne Grêt‐Regamey; Andreas Heinimann; Christian Huggel; Rolf Weingartner; Irasema Alcántara-Ayala; Aster Gebrekirstos; Ricardo Grau; Elizabeth Jiménez
The Mountain Research Initiative (MRI) promotes basic and applied research to understand how drivers and processes of global change present challenges and opportunities in mountain social-ecological systems. It convenes a global network that collectively generates and synthesizes knowledge on global change in mountains that also supports decisions and actions to enable sustainable development. Building on the considerable social and intellectual wealth fostered by the MRI over its past 20-plus years of existence, we outline future directions aimed at supporting and further developing the network as well as our flagship and community-led activities aimed at linking and scaling interdisciplinary and transdisciplinary research efforts within and across mountain regions worldwide.
Seasonal trends of atmospheric nitrogen dioxide and sulfur dioxide over North Santa Clara, Cuba
(Springer Science+Business Media, 2012) Daniellys Alejo Sánchez; Mayra C. Morales Pérez; Jorge B. de la Torre; Ricardo Grau; László Bencs; René Van Grieken; P. Van Espen; Dismey Sosa; Vladimir Núñez Caraballo