Found 624410 result(s)
Found 6245 page(s)

Reproductive patterns and human-influenced behavior in brown bears: implications for the conservation of large carnivores = Reproduksjonsmønster og menneskeskapt atferdsendring hos brunbjørn: konsekvenser for bevaringen av store rovdyr

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Ordiz Fenández, Andrés

140 p., Los objetivos de esta tesis fueron 1) mejorar un método de seguimiento de poblaciones de oso pardo (Ursus arctos) basado en el conteo de osas con crías, incluyendo un estudio sobre patrones de reproducción, y 2) explorar algunos efectos de actividades humanas sobre el comportamiento de los grandes carnívoros, con los osos como especie modelo. Seis de los trabajos fueron descriptivos, basados en datos empíricos, y sus resultados esenciales, en relación con los objetivos expuestos, son los…



Proteomics and secretomics of Penicillium chrysogenum: Molecular characterization of proteins relevant for penicillin biosynthesis = Proteómica y secretómica de "Penicillium chrysogenum": caracterización molecular de proteínas importantes para la biosíntesis de penicilina

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Jami, Mohammad Saeid

366 p., Eighty years after the discovery of penicillin, the interest of this ß-lactam antibiotic at industrial level is still remarkable. Despite the good background knowledge, little is known on how Penicillin chrysogenum became a good penicillin overproducer, and much of the molecular basis for improved productivity remains obscure. Some light has been shed on this issue after the recent publication of the P. chrysogenum genome (van den Berg et al., 2008). These authors reported that transcription of…



Academic book reviews of literature in English and Spanish: writers’ visibility and invisibility strategies for expressing critical comments

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Moreno Fernández, Ana Isabel, Suárez, Lorena

345 p., One important academic writing skill is the ability of writers to construe an appropriate representation of themselves and their work through their textual voice. One way in which writers achieve this is by intruding into their text in order to explicitly signal or conceal their personal responsibility for the ideas referenced in it. However, writers’ decisions in this respect have shown to be highly problematic in English for Academic Purposes (EAP), especially for non-native English speakers…



On the universality of the politeness concept of ‘face’: Evaluation strategies for construing ‘good face’ across writing cultures: writers’ voice in academic book reviews

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Moreno Fernández, Ana Isabel

One important academic writing skill is the ability of writers to construe an appropriate representation of themselves and their work through their textual voice. One way in which writers achieve this is by intruding into their text in order to explicitly signal or conceal their personal responsibility for the ideas referenced in it. However, writers’ decisions in this respect have shown to be highly problematic in English for Academic Purposes (EAP), especially for non-native English speakers…



Asymmetry as element of federalism: a theoretical speculation fifty years later. Readrres Spanish case

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Seijas Villadangos, Esther

Estudio teórico y práctico de la modalidad federal conocida como asimétrica



The films of Pedro Almodóvar: translation and reception in the United States

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rox Barasoain, María

390 p., Análisis de las estrategias seguidas por los traductores audiovisuales de las películas de Pedro Almodóvar comercializadas en los Estados Unidos y estudio de la recepción de su cine por una audiencia estadounidense



The communication problems of Spanish researchers to get research articles published in Applied Linguistics English-medium journals: proposal and analysis

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Moreno Fernández, Ana Isabel

This paper is a revised version of a three-hour seminar given in Spanish at the VIII Semana de la Ciencia en Madrid, Spain, 18 November 2008, under the title: ¿Es el discurso científico universal en su contenido y forma?. The purpose of this seminar was to introduce a non-specialised audience to a relatively new field of research within Applied Linguistics, known as Intercultural Rhetoric. This research field mainly seeks to describe and explain the communication problems encountered by writers…



Spanish Researchers Publishing In Scientific Journals: Motivations, Views, Strategies, Experiences and Training Needs

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Moreno Fernández, Ana Isabel, Rey-Rocha, Jesús, Burgess, Sally, Martín-Martín, Pedro, Gea-Valor, Mª Lluisa, López-Navarro, Irene, Garzón, Belén, Sachdev, Itesh

In recent decades, there has been a growing move towards publication in English-medium journals among multilingual researchers and a growing demand for materials (Swales and Feak, 2004) and courses in skills relevant to publishing in English for Research Publication Purposes (ERPP) (Moreno 2011). Research into academic writing has also flourished world-wide (Swales 2004), with crosscultural and intercultural studies of academic discourse across various languages and English being an area of…



Effect of the river disturbance regime on floodplain structure and organic matter accretion at the Middle Ebro River = Efecto del régimen de variación de caudales en la estructura de las llanuras de inundación y la acumulación de materia orgánica en el tramo medio del Ebro

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Cabezas Beaumont, Álvaro

133 p., Con el objetivo de evaluar la influencia del régimen de alteración fluvial tanto sobre la estructura de las llanuras de inundación como sobre la acumulación de materia orgánica en el sustrato, todo ello en un contexto de fuerte alteración antrópica, se seleccionó una sección del tramo medio del Río Ebro, considerándo múltiples escalas espaciotemporales para el estudio. Además, se evaluó el estado ecológico del tramo de estudio, sugiriendo una serie de propuestas para rehabilitar el sistema…



Cantabrian Capercaillie signs dissapeared after a wind farm construction

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
González González, Manuel Antonio, Ena Álvarez, Vicente

P. 65-74, Capercaillie (Tetrao urogallus) is a grouse highly sensitive to human activities and declining throughout most of its European range. The Cantabrian subespecies Tetrao urogallus cantabricus is the most endangered and the only inhabiting caducifolious forests. Although many causes have been suggested as possible reasons for its alarming decline, no definite evidence supports any of them. Hence, the only effective measure so far is habitat conservation. In this sense, wind farms development is an…, NO



The Mediterranean Quercus pyrenaica oak forest: a new habitat for the Capercaillie?

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
González González, Manuel Antonio

P. 901-906, We described an extension of the known distribution range of the Cantabrian Capercaillie Tetrao urogallus cantabricus into an atypical area and habitat for the species. Nine Capercaillie leks and 14 cocks were registered in Mediterranean Quercus pyrenaica forests in an area of 1,500 km2, of which 4,500 forest hectares were surveyed. At present, this population represents both the southern-most distribution for Capercaillie and the only one inhabiting Mediterranean Q. pyrenaica forests, what…, SI



Habitat selection and diet of Western Capercaillie

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Olea, Pedro P., Mateo-Tomás, Patricia, García-Tejero, Sergio, Robles, Luis, González González, Manuel Antonio, Frutos Tena, Ángel de, Purroy, Francisco J., 1946-, Ena Álvarez, Vicente

P. 260-272, Ecological features and conservation requirements of populations at the latitudinal limits of a species’ geographical range frequently differ from those in other parts of the range. Identifying such differences is key to implementing effective conservation strategies for threatened range-edge populations especially, in the context of rapid global warming, at the lower-latitude range edge. We studied habitat selection and diet of the endangered Cantabrian Capercaillie Tetrao urogallus…, SI



Studying the evolution of libre software projects using publicly available data

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente

Libre software projects offer abundant information about themselves in publicly available storages (source code snapshots, CVS repositories, etc), which are a good source of quantitative data about the project itself, and the software it produces. The retrieval (and partially the analysis) of all those data can be automated, following a simple methodology aimed at characterizing the evolution of the project. Since the base information is public, and the tools used are libre and readily…



Designing a minimal reactive goalie for the RoboCup SPL

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
García, Juan F., Rodríguez, Francisco J., Fernández Llamas, Camino, Matellán Olivera, Vicente

This paper presents the basic design and implementation of a goalkeeper made according to the regulations of the two-legged Standard Platform League of the RoboCup Federation. The paper describes the perceptive schemas created using the architecture of the TeamChaos-URJC team as well as the action schemes designed to create a minimal reactive goalie. This player was tested in the 2009 German Open international competition. The results obtained there are analyzed and the future works derived…



Combining Classical and Reactive Planning: the ABC Model

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Borrajo, Daniel

Systems that must plan, act, and probably learn using a rational, flexible behavior in real time present a challenge to current integrated schemas of planning and acting. Classical planning is still far from solving problems on such short time as needed in dynamic domains, such as Robosoccer, even with new approaches such as graph-based techniques. Reactive systems on the other hand, are hard to configure and do not work well when high level flexible reasoning is required.This paper presents an…



Comparing Bayesian and Montecarlo localization for a robot with local vision

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Crespo, María A., Cañas, José María, Matellán Olivera, Vicente

Position estimation is one of the classic problems in mobile robotics. The goal of this paper is to compare two probabilistic localization methods based on local vision for a mobile robot. The experimental set up is based on the Aibo league of the RoboCup, where the robotic dogs major sensor is the on-board camera. Two localization algorithms, Bayesian and Montecarlo (MCL), have been implemented and compared, and their behaviour studied in several situations using a simulator



Identifying Spanish researchers’ needs for training in English for Research Publication Purposes: Methodological aspects of a large-scale online survey

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Moreno Fernández, Ana Isabel, Rey-Rocha, Jesús, Burgess, Sally, López-Navarro, Irene, Sachdev, Itesh

This paper mainly aims to report on the survey method employed in Phase 1 of the ENEIDA project to fulfil the following aims: a) locating those researchers at the five institutions participating in the project who might be interested in receiving ERPP training and in collaborating in subsequent phases of the project; b) identifying their specific needs vis-à-vis ERPP; and c) providing a context for future studies of Spanish-English intercultural rhetoric for research publication purposes. The…



Introduction to the Spanish national team for intercultural studies of academic discourse (ENEIDA) project and research group

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Moreno Fernández, Ana Isabel

In recent decades, there has been a growing move towards publication in English-medium journals among multilingual researchers and a growing demand for materials (Swales and Feak, 2004) and courses in skills relevant to publishing in English for Research Publication Purposes (ERPP) (Moreno 2011). Research into academic writing has also flourished world-wide (Swales 2004), with crosscultural and intercultural studies of academic discourse across various languages and English being an area of…



Programming Model Based on Concurrent Objects for the AIBO Robot

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Martín Rico, Francisco, Cañas, José María, González-Careaga, Rafaela, Matellán Olivera, Vicente

This paper presents the object-oriented programing envir- onment for the AIBO robot, focusing in its concurrency model. Con- currency problems arise when programming a robot due to the various sensors and actuators that the programmers must manage. As this man- agement has some aspects of real time and communication, involves some coplexity. In order to deal with this complexity Sony has developed a framework for programming the AIBO Robot. The description of this API called OPEN-R is presented…



Advantages and shortcomings of migrating cartography from ArcViewTM to ArcGisTM. Conclusions and practical recommendations

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Álvarez Taboada, María Flor, Rodríguez Pérez, José Ramón, 1968-

P. 1-11, En este artículo se exponen de un modo práctico las ventajas e inconvenientes de la migración de la cartografía de ArcViewTM 3.x a ArcGISTM 8.x y se incluyen recomendaciones y sugerencias basadas en la experiencia práctica de los autores, para hacer esta tarea más sencilla. Los usuarios SIG se encontrarán con un nuevo sistema y nuevos conceptos, más allá de un simple cambio de versión. Diseñar un nuevo SIG en lugar de adaptar el existente puede ser incluso la solución más sencilla, puesto que…, SI



Agent-based Adaptive Selection and Interaction to Z39.50 Servers

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Fernández Llamas, Camino, Aedo Cuevas, Ignacio, Díaz Pérez, Paloma, Matellán Olivera, Vicente

Digital libraries and OPACs are offering an enormous collection of information resources which can be accessed through Internet by quite different users thanks to the existence of standard protocols for information retrieval such as Z39.50. However, some users may find difficult to get the items they are looking for in such a huge bulk of heterogeneous resources since they have to know where and how they have to search for. Thus, one of the main reasons for the disregard of the Z39.50 service…



Learning Fuzzy Reactive Behaviors in Autonomous Robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Molina, José Manuel, Sánz, Javier, Fernández Llamas, Camino

This paper is concerned with the learning of basic behaviors in autonomous robots. In this way, we present a method for the adaptation of basic reactive behaviors implemented as fuzzy controllers applying a genetic algorithm to the evolution of the fuzzy rule system. In this sense, we show our experiments in the evolution of control rules based on symbolic concepts represented as linguistic labels. The rules will be formulated in a fuzzy way and in order to test the rules obtained in each…



Different robotics platforms for different teaching needs

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Cañas, José María, González-Careaga, Rafaela

When facing the problem of teaching the basis of robot control programming to computer science students, apart from the syllabus of the course, some other requirements have to be taken into account. For instance, which are the most appropriate robotic platforms, and which are the best programming tools for teaching it. In this paper we describe the platforms and programming environments chosen for different senior and graduate robotic courses at Rey Juan Carlos University, focusing on the…



Using visual attention in a Nao humanoid to face the RoboCup any-ball challenge

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
García Sierra, Juan Felipe, Rodríguez, Francisco J., Martín Rico, Francisco, Matellán Olivera, Vicente

Visual attention is a natural tool which allows animals to locate relevant objects or areas in a given scene, discarding the rest of elements present and thus reducing the amount of information to deal with. In this paper we present the design an implementation of a visual attention mechanism based on a saliency map and its implementation in the Nao humanoid. This control mechanism is applied to solve one of the challenges proposed in the RoboCup competition named ”any-ball”. The results…



Multi-camera 3-D tracking using particle filter

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Barrera González, Pablo, Cañas, José María, Matellán Olivera, Vicente, Martín Rico, Francisco

Determining the 3D location of a moving object, and tracking it from a sequence of different camera images is a classical but still challenging problem. In our approach neither explicit triangulation, nor precise motion model are used; only the colour of the object to be tracked is required. We use a particle filter, where the observation model we have developed avoids the colour filtering of the entire image. Preliminary experiments are presented and lessons learned are commented. The approach…



ABC2: An Architecture for Intelligent Autonomous Systems

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Borrajo, Daniel

This paper presents an architecture for the control of autonomous systems that allows cooperation among them This paper focuses on the description of the upper layers of the model The control structure is based on a general purpose multi agent architecture based on a two levels approach One level is composed of reactive skills capable of achieving simple actions by their own The other one is an agenda used as an opportunistic planning mechanism to compound activate and coordinate the…



Dynamic Schema Hierarchies for an Autonomous Robot

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Cañas, José María, Matellán Olivera, Vicente

P. 902-913, This paper proposes a behavior based architecture for robot control which uses dynamic hierarchies of small schemas to generate autonomous behavior. Each schema is a ow of execution with a target, can be turned on and o , and has several parameters which tune its behavior. Low level schemas are woken up and modulated by upper level schemas, forming a hierarchy for a given behavior. At any time there are several awake schemas per level, running concurrently, but only one of them is activated by…



Libre software role in edutainment robotics market

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Centeno González, José, Heras Quirós, Pedro de las, González Barahona, Jesús

Some of the most succesful products in the market of robots for edutainment have made manufactures realize that software for controlling the robots is one of the key elements of the success. Some of them have also conclude that libre software is the best way to produce, maintain and distribute their software. This paper will summarize the fundamentals of the libre software model and their benefits for the edutainment robot market as well as some examples of companies currently supporting it



VQQL: a model to generalize in reinforcement learning

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Fernández, Fernando, Borrajo, Daniel, Matellán Olivera, Vicente

Reinforcement learning har proven to be very successful for finding optimal policies on uncertian and/or dynamic domains. One of the problems on using such techniques appears with large state and action spaces. This problem appears very frequently given that most information in the type of tasks to which these techniques have been applied is continuous. In the paper, we describe a new mechanism for solving the states generalization problem in reinforcement learning algorithms, the VQQL technique



An agenda-based multi-agent architecture

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Borrajo, Daniel

This paper presents an architecture for the control of simulated robots for the RoboCup that allows explicit cooperation among them. The structure of the software agents controlling the robots is based on a general porpuse multiagent architecture based on a two level approach. One level is composed of reactive skills capable of archieving simple actions by their own. The other is based on a agenda used as an opportinistic planning mechanism to compound, activate and coordinate the basic skills…



Libre software for computer science classes

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
González Barahona, Jesús, Heras Quirós, Pedro de las, Centeno González, José, Matellán Olivera, Vicente, Ballesteros Cámara, Francisco J.

P. 76-80, During 1991 and 1992, the landscape of libre software, and of software development in general, was ready for a change. In two D different communities, two very exciting events were taking place: 386BSD, a libre derivative of the BSD code, was born, and Linus Torvalds distributed the first versions of the Linux kernel. Soon after, the software community had two libre operating systems at its disposal (for some basic references to online information on libre products and…, SI



Downsizing robotics: Autonomy vs. intelligence

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Fernández Llamas, Camino, García Sierra, Juan Felipe, Rodríguez Lera, Francisco Javier

Research on Mobile robotics is in our opinion more focused on generating autonomous behaviors than on the development of basic technologies (locomotion, localization, navigation, etc.). However, this issue is really a complex problem where many technologies converge: artificial perception, electronics, even philosophy and there are no general theories generally accepted in the research community. Historically, Cybernetics was the first subjacent theory, then artificial intelligence…



Impact of libre software tools and methods in the robotics field

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Barrera González, Pablo, Robles Martínez, Gregorio, Cañas, José María, Martín Rico, Francisco, Matellán Olivera, Vicente

Software is one of the major components of robots; in fact, it is the main bottleneck for the proliferation of robotics in our everyday lives. In the last years the field of robotics has been an emerging application area of the libre (free/open source) software phenomenon. Libre software tools have been traditionally popular among the robotics research and teaching community. Even companies whose main business model is to sell robots have found convenient to share the software in order to…



PERA: Ad-hoc routing protocol for mobile robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Agüero, Carlos, Matellán Olivera, Vicente, Heras Quirós, Pedro de las, Cañas, José María

Mobile robots need to be able to communicate among them, and with other hosts participating in a given task. Traditional wired networks are obviously not suitable for mobile robots. Current wireless networks are usually based on a fixed network infrastructure (base stations) to route packets. The best alternative for mobile robots are Ad-Hoc networks, which are wireless networks that do not need a fixed infrastructure. This paper describes PERA, an adaptation of an adhoc routing protocol that…



Visual object tracking in 3D with color based particle filter

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Barrera González, Pablo, Matellán Olivera, Vicente, Cañas, José María

This paper addresses the problem of determining the current 3D location of a moving object and robustly tracking it from a sequence of camera images. The approach presented here uses a particle lter and does not perform any explicit triangulation. Only the color of the object to be tracked is required, but not any precise motion model. The observation model we have developed avoids the color ltering of the entire image. That and the MonteCarlo techniques inside the particle lter provide real…



Fusion of fuzzy behaviors for autonomous robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Molina, José Manuel, Fernández Llamas, Camino

A new methodological approach to solve the problem of integrating different behaviors in autonomous robots is developed in this paper. It relies on the succesful integration of several fuzzy relational algorithms (Zadeh73), each one specialized in a different task. The whole system is based on a continiously act on sensor data (reactive) approach. The problem is how to got an intelligent behavior from low level reactive controllers. Our assumption is that we can obtain adecuate response to…



Distributed fuzzy decision making system

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Molina, José Manuel, Matellán Olivera, Vicente, Fernández Llamas, Camino

This paper deals with the decision making process, using fuzzy information, in a distributed environment. In order to deal with the complexity of this problem we have used the agent model approach. In this way we have apply this model to the problem of transportation in a non-centralized environment. The internal decosion process inside each agent is archieved through a fuzzy reasoning system



ABC2 an agenda based multi-agent model for robots control and cooperation

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Borrajo, Daniel

This paper presents a model for the control of autonomous robots that allows cooperation among them. The control structure is based on a general purpose multi-agent architecture using a hybrid approach made up by two levels. One level is composed of reactive skills capable of achieving simple actions by their own. The other one uses an agenda used as an opportunistic planning mechanism to compound, activate and coordinate the basic skills. This agenda handles actions both from the internal…



Visual based localization of a legged robot with a topological representation

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Martín Rico, Francisco, Matellán Olivera, Vicente, Agüero, Carlos, Cañas, José María

In this chapter we have presented the performance of a localization method of legged AIBO robots in not-engineered environments, using vision as an active input sensor. This method is based on classic markovian approach but it has not been previously used with legged robots in indoor office environments. We have shown that the robot is able to localize itself in real time even inenvironments with noise produced by the human activity in a real office. It deals with uncertainty in its…



Communications for cooperation: the RoboCup 4-legged passing challenge

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Agüero, Carlos, Matellán Olivera, Vicente, Martín Rico, Francisco, Cañas, José María, Ortuño, Miguel

Communications are the basis for the collaborative activities in the TeamChaos 4-legged team. In this paper we present the communications architecture developed both to let teammates communicate, and to easy the debugging of robot behaviors from external computers. Details of its implementation on the aiBo robots are also given. Using this infrastructure we describe a protocol for role exchange named Switch! that we have created. We also describe the use of both the communication architecture,…



Genetic learning of fuzzy reactive controllers

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Fernández Llamas, Camino

P. 33-41, This paper concerns the learning of basic behaviors in an autonomous robot. It presents a method to adapt basic reactive behaviors using a genetic algorithm. Behaviors are implemented as fuzzy controllers and the genetic algorithm is used to evolve their rules. These rules will be formulated in a fuzzy way using prefixed linguistic labels. In order to test the rules obtained in each generation of the genetic evolution process, a real robot has been used. Numerical results from the…, SI



Multi-agent versus multi-robot and other byzantine discussions

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente

P. 1-3, This special issue of the Journal of Physical Agents is devoted to multi-robot systems. Some might perhaps argue that the term should have been ”multi-agent systems” or ”physical multi-agent systems”, in accordance with the title of the journal. In any language, there are clusters of several words with closely similar meanings. Expressions in science and technology are no exceptions, although they are supposed to be more specific. In particular, in the world of computer science, the term ”agent…, SI



Dynamic gridmaps: comparing building techniques

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Cañas, José María

P. 5-22, Mobile robots need to represent obstacles in their surroundings, even moving ones, to make right movement decisions. For higher autonomy the robot should automatically build such representation from its sensory input. This paper compares the dynamic character of several gridmap building techniques: probabilistic, fuzzy, theory of evidence and histogramic. Two criteria are defined to rank such dynamism in the representation: time to show a new obstacle and time to show a new hole. The update…, SI



Fuzzy adaptation for information acces to digital libraries

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Fernández Llamas, Camino, Aedo Cuevas, Ignacio, Díaz Pérez, Paloma, Matellán Olivera, Vicente

P. 287-297, Different models have been proposed to build systems that adapt to the user reducing the complexity in the information browsing process, saving user time and offering personalised interfaces. The work described in this paper, named Way-Z39.50, is an example of adaptive system specially built for accessing digital libraries. A fuzzy decision mechanism is used to implement the adaptation of both the user interface and the information searching process. This paper describes how this system has been…, SI



SWITCH! Dynamic roles exchange among cooperative robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Agüero, Carlos, Matellán Olivera, Vicente, Gómez Gómez, Víctor Manuel, Cañas, José María

In this article we propose a dynamic role exchange algorithm for mobile robots. The heuristics used to alternate among the different roles is based on utility functions. We have utilize the Sony Aibo ERS-7 for testing our design and implementation. The RoboCup 4-legged competition environment has been chosen for proving our work



Visual based localization for a Legged Robot

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Martín Rico, Francisco, Matellán Olivera, Vicente, González-Careaga, Rafaela, Barrera González, Pablo, Cañas, José María

P. 708-715, This paper presents a visual based localization mechanism for a legged robot. Our proposal, fundamented on a probabilistic approach, uses a precompiled topological map where natural landmarks like doors or ceiling lights are recognized by the robot using its on-board camera. Experiments have been conducted using the AIBO Sony robotic dog showing that it is able to deal with noisy sensors like vision and to approximate world models representing indoor of ce environments. The two major…, SI



Design an evaluation of RoboCup humanoid goalie

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
García Sierra, Juan Felipe, Rodríguez Lera, Francisco Javier, Fernández Llamas, Camino, Matellán Olivera, Vicente

P. 19-26, In this article we describe the ethological inspired architecture we have developed and how it has been used to implement a humanoid goalkeeper according to the regulations of the two-legged Standard Platform League of the RoboCup Federation. We present relevant concepts borrowed from ethology that we have successfully used for generating autonomous behaviours in mobile robotics, such as the use of ethograms in robotic pets or the ideas of schemata, or the use of fixed actions patterns to…, SI



Using genetic algorithms for real-time object detection

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Martínez Gómez, Jesús, Gámez Martín, José Antonio, García Varea, Ismael, Matellán Olivera, Vicente

P. 1-12, This article presents a new approach to mobile robot vision systems based on genetic algorithms. The major contribution of the proposal is the real-time adaptation of genetic algorithms, which are generally used offline. In order to achieve this goal, the execution time must be as short as possible. The scope of the System is the robotic football competition Robocup whitin the Standard Platform category. The system developed detects and estimates distance and orientation to key elements on a…, SI



Visual based localization for a Legged Robot

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Martín Rico, Francisco, Matellán Olivera, Vicente, Cañas, José María, Barrera González, Pablo

This paper presents a visual based localization mechanism for a legged robot in indoor office environments. Our proposal is a probabilistic approach which uses partially observable Markov decision processes. We use a precompiled topological map where natural landmarks like doors or ceiling lights are recognized by the robot using its on-board camera. Experiments have been conducted using the AIBO Sony robotic dog showing that it is able to deal with noisy sensors like vision and to approximate…



Using ABC2 in the RoboCup domain

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Borrajo, Daniel, Fernández Llamas, Camino

P. 475-483, This paper presents an architecture for the control of autonomus agents that allows explicit cooperation among them. The structure of the software agents controlling the robots is based an a general purpose multi-agent architecture based on a two level approach. One level is composed of reactive skills capable of archieving simple actions by their own. The other is based an an agenda used as an opportunistic planning mechanism to compound, activate and coordinate the basic skills. This agenda…, SI



Communications and basic coordination of robots in TeamChaos

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Agüero, Carlos, Martín Rico, Francisco, Martínez Barbera, Humberto, Matellán Olivera, Vicente

How to coordinate a set of robots is still an open issue. It is a problem made up by several sub-problems. One of them is how to share information among the members of a team without compromising the basic requirements of the application. In this paper we show the communication architecture we have designed to let a team of robots communicate. We present an application of this architecture to implement a simple ball booking protocol to share the information about the ball among the robotic team…



Vision based behaviors for a legged robot

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Ruiz, Juan V., Montero, Pablo, Martín Rico, Francisco, Matellán Olivera, Vicente

This article describes two vision-based behaviors designed for an autonomous legged robot. These behaviors have been designed in a modular way in order to be able to integrate them in an architecture named DSH (Dynamic Schema Hierarchies), which is also briefly described. These behaviors have been tested in office indoor environments and experiments carried out are also described in this paper. The platform used in these experiments carried out are also described in theis paper. The platform…



Robot localization using WiFi signal without intensity map

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Serrano, Oscar, Rodero Merino, Luis, Matellán Olivera, Vicente, Cañas, José María

This paper describes a method to estimate the position of a mobile robot in an indoor scenario using the odometric calculus and the WiFi energy received from the wireless infrastructure. This energy will be measured by wireless network card on-board a mobile robot, and it will be used as another regular sensor to improve position estimation. The Bayes rule will be used to accumulate localization probability as the robot moves on. In this paper several experiments in a university building are…



Vision-based schemas for an autunomous robotic soccer player

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Gómez Gómez, Víctor Manuel, San Martín, Félix, Matellán Olivera, Vicente, Cañas, José María

This article describes two vision-based behaviors designed for an autonomous robot. These behaviors have been designed and implemented using schemas according to an architecture named DSH (Dynamic Schema Hierarchies), which is also briefly described. The reactive behaviors implemented have been tested in our robotic soccer players, running in EyeBot commercial platforms. The developed behaviors provide the robot with the follow ball, and the follow border capabilities, using only the local…



Implementing human-acceptable navigational behavior and fuzzy controller for an autonomous robot

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Simmons, Reid

Robots are just starting to appear in peopled environments but in order to be accepted by humans, they should obey basic people’s social rules. In particular, they have to be able to move around without disturbing people. This means that they have to obey the social rules that manage the movement of people, for example following virtual lanes when moving through corridors, not crossing in front of moving people, etc. In this paper some of these aspects are explained, as well as the…



The Definition of Damage Resulting from Transboundary Movements of Living Modified Organisms in Light of the Cartagena Protocol on Biosafety

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Escudero Espinosa, Juan Francisco

P. 319-342, The concept of risk requires preventative measures as well as measures of liability and redress in the case that damage is actually caused. The Cartagena Protocol on Biosafety limits itself in Article 27 to the establishment of a mandate for the elaboration of norms and procedures in regard to liability and redress. The development of this Article 27 requires firstly a definition of the concept of damage to the conservation and sustainable use of biological diversity, secondly a survey of the…, SI



Sidebar- Programming Commercial Robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, McDonal, Bruce, Biggs, Geoffrey, Cañas, José María

P. 125-132, Manual systems require the user/programmer to directly enter the desired behaviour of the robot, usually using a graphical or text-based programming language, as shown in Fig. 1. Text-based systems are either controller-specific languages, generic procedural languages, or behavioural languages, which typically differ by the flexibility and method of expression of the system. Graphical languages [BKS02, BI01] use a graph, flow-chart or diagram based graphical interface to programming, sacrificing…



Fuzzy multi agent interaction

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Molina, José Manuel, Matellán Olivera, Vicente, Sommaruga, Lorenzo

In this paper a fuzzy communication protocol among agents in a group is presented as an alternative solution to the classical ones used in architectures for the cooperation of agents. In order to achieve this goal, the integration of previous works carried out on fuzzy behaviors and on cooperative architectures at the Intelligent Agents Lab. (LAI) has been used. This cooperation/coordination protocol is necessary to successfully control a group of autonomous robots. The protocol will take into…



Fuzzy cooperation of autonomous robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Molina, José Manuel, Sommaruga, Lorenzo

In this paper a fuzzy interaction among robots in a group is presented as an alternative solution to the classical protocols used in architectures for the cooperation of robots. In order to achieve this goal, the integration of previous works carried out on fuzzy behaviors and on cooperative architectures at the Intelligent Agents Lab. (LAI) has been used. This cooperation/coordination protocol is necessary to successfully control a group of autonomous robots. The protocol will take into…



Libre software environment for robot programming

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Centeno González, José, Heras Quirós, Pedro de las, González Barahona, Jesús

When facing the problem of teaching the basis of robot control programming to computer sciences students, apart from the syllabus of the course, some other requeriments have to be considered as which is the most appropiate robot, and which are the rigt tools we have chosen for teaching robotics, focussing on the environment that support the practical assignements. We also analyze the reasons that make us chosse each of the tools, making special emphasis on the Libre requirement that we have…



Abbreviated dynamic souce ruoting: source routing with not-unique network identifiers

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Rodero Merino, Luis, Robles Martínez, Gregorio, Ortuño, Miguel

Current ad-hoc network protocols are designed for host similar to those used in fixed networks. Those protocols are not adequate for some applications of ad-hoc networks, where used resources are very scarce. One example is the size of the network addresses, which may be a critical issue, specially whit the use of IPv6 in DRS. This is due to the fact that this protocol uses souece ruoting, so each datagram must carry the sddresses of all the machines in its path. In this paper a new protocol…



Saliency map based attention control for the RoboCup SPL

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
García Sierra, Juan Felipe, Rodríguez Lera, Francisco Javier, Fernández Llamas, Camino, Matellán Olivera, Vicente

Attention mechanism can be used both for reducing the amount of perceptual information to be processed and for restricting all available actions to only those useful for a given scenario. Information reduction improves performance and action restriction allows for a more precise interaction with our environment. In this paper we present the design of an attention control mechanism based on a saliency map and its implementation in the SPL's Nao robot. The results obtained are analysed and…



Distributed perfection for a group of legged robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Agüero, Carlos, González, Antonio L., Martín Rico, Francisco, Matellán Olivera, Vicente

Perception problem in robotics has been usually faced from the individual perspective, in this work we present preliminary results of a shared perception mechanism for a group of legged robots working is a dynamic scenario. The experiments has been conducted using a group of aiBo robots in the RoboCup environment. Each individual robot has its own perception of a common interesting feature, the ball, and they al together build a shared perception



VIGICOP: autonomous surveillance robots with Sodar detection and autonomous navigator

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Durán, Javier, Abril, Evaristo J., Rodríguez Lera, Francisco Javier, García Sierra, Juan Felipe, Matellán Olivera, Vicente, Villacorta, Juan J., Izquierdo, Alberto, Cerezal, Sergio, Calvo, Miguel

The main goal of the project described in this paper is to create a security system using autonomous surveillance robots that use SODAR-like detection system sensors, working with acoustic signals in air environment and navigation base on Geographic Information System and Markov's models. The surveillance system based on SONAR provides great information from the environment, even lets you see behind objects (rebounds effects) whose manipulation offers a…



Graphical user interface in JDE robots applications

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Matellán Olivera, Vicente, Cañas, José María

JDE is an ethology inspired architecture for designing applications both in autonomous and teleoperated robots. In this paper we will outline the JDE architecture, present some tools included in the JDE suite and show several examples of different applications built using it. Experiments carried out using this suite will be described and the obtained results discussed. We will make emphasis on the Graphical User Interfaces of the examples, like those in Fig. 1. JDE suite provides a exible way…



Nancy Huston: The Ways of Self-Translating = Nancy Huston: estrategias de autotraducción

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Richters, Marlisa Amanda

321 p., Este trabajo contiene una biografía y una bibliografía detalladas de Nancy Huston. A continuación se analizan tres novelas de la autora que han sido autotraducidas - Plainsong, Slow Emergencies y L'Empreinte de l'ange - para analizar la casuistica que se pueda encontrar en cuanto a la autotraducción de Nancy Huston



Localization issues in the design of a humanoid goalkeeper for the RoboCup SPL

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez, Víctor, Rodríguez, Francisco J., Matellán Olivera, Vicente

This article exposes the localization issues faced during the implementation of a humanoid goalkeeper to take part in the RoboCup SPL standardized soccer robot competition. For this task, we have used BICA, a state-driven, component-based architecture created by our counterparts in the URJC, to allow a much easier behavior design process. The use of BICA let us choose different self-localization methods in configuration time, and the possibility of using none in running time if some type of…



Design and implementation of an ad-hoc routing protocol for mobile robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Agüero, Carlos, Cañas, José María, Ortuño, Miguel, Matellán Olivera, Vicente

P. 307-320, Mobile robots need to be able to communicate among themselves, as well as with hosts participating in the task that they are all involved in. Wired networks are obviously not suitable for mobile robots. Current wireless networks based on a fixed infrastructure (GSM, WiFi, etc.) to route packets may not be suitable because this infrastructure does not cover every place and the requirements of its resources. The best choice for mobile robots are Ad-Hoc networks, which are wireless and do not need…, SI



Using fuzzy logic to implement adaptability in WAY-Z39.50

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Fernández Llamas, Camino, Matellán Olivera, Vicente, Aedo Cuevas, Ignacio, Díaz Pérez, Paloma

The design and implementation of adaptive systems for accessing information is a sophisticated task. Different models have been proposed to build systems that adapt to the user reducing the complexity in the information browsing process, saving user time and offering personalized interfaces. The work described in this paper, named WAY-Z39.50, is an example of fuzzy adaptive system specially built for accessing digital libraries



Augmented reality to improve teleoperation of mobile robots

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez Lera, Francisco Javier, García Sierra, Juan Felipe, Fernández Llamas, Camino, Matellán Olivera, Vicente

In this article we want to discuss the skills required for human teleoperators of mobile robots. We show the classical problems related with teleoperation but focus our discussion in not specialized operators. We want to show how a proposal based on augmented reality interfaces can improve the performance of operators controlling the robot. We present the validation of our solution in two experiments: one in a controlled circuit and another one in a real environment. To carry out our…



Computer surgery 3D simulations for a new teaching-learning model

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Esteban Costales, Gonzalo, Fernández Llamas, Camino, Matellán Olivera, Vicente, Gonzalo Orden, José Manuel

Using 3D computer simulations for training surgeons is not new. Using e-learning for improving students knowledge acquisition is not new. What we propose is to use 3D computer simulations in such a versatile way that those simulations could act as learning objects designed directly by those who own the experience we want to be transmitted. In order to achieve this goal, it is necessary to create a model in charge of communications between the learning objects and the simulation. This model…



Alternatives for programming a low-cost UAV in robotics

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Castro de Lera, Mario, Matellán Olivera, Vicente

The aim of this paper are to present different alternatives to program a commercially available ffying platform, and to discuss what we consider more convenient to be used by our under-graduate students in a regular robotics course to teach them basic vision based control. Due to the background of our students, we will focus more on the description of the software application interface, than on the hardware, although we will describe also both. We also will describe



Robotics and augmented reality for elderly assistance

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez Lera, Francisco Javier, Botas Muñoz, Álvaro, García Sierra, Juan Felipe, Rodríguez, Carlos, Matellán Olivera, Vicente

This article presents a tele-assistance system based on augmented reality for elderly people that is integrated in a mobile platform. We propose the use of augmented reality for simplifying interaction with its users. The first prototype has been designed to help in medication control for ederly people. In this paper, both hardware and software architectures are described.The robotic platform is a slightly modified version of the Turtlebot platform. The software is based on ROS for the platform…



Monitoring, identification, genotyping and inactivation of enteric viruses in de food chain = Monitorización, identificación, genotipado e inactivación de virus entéricos en la cadena alimentaria

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Díez Valcarce, Marta

265 p., En esta tesis se ha trabajado en la estandarización de la metodología de análisis, desde la toma de muestras de alimento, hasta la concentración, extracción y detección de los virus de origen alimentario y se ha evaluado la eficacia de tecnologías emergentes de inactivación vírica que pueden ser aplicadas en la industria alimentaria



Some facts concerning the epizootiology of trichinellosis in Spain

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Cordero del Campillo, Miguel, Martínez Fernández, Antonio R., Aller Gancedo, Benito

P. 315-328, La triquinelosis sigue teniendo gran interés en España, a pesar de los progresos de la producción e industrialización del cerdo, pues persiste el hábito del consumo de productos cárnicos porcinos crudos y, en el medio rural, el cerdo sigue siendo la principal fuente de proteinas de origen animal para el campesino. La revisión histórica demuestra el decisivo papel que tuvieron las epidemias de finales del siglo XIX en España, para el establecimiento de la inspección microscópica de carnes de…



Workflow to improve the forest management of Eucalyptus globulus stands affected by Gonipterus scutellatus in Galicia (Spain) using remote sansing and GIS

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Álvarez Taboada, María Flor, Lorenzo Cimadevilla, Henrique, Rodríguez Pérez, José Ramón, 1968-, Picos Martín, Juan

In Spain there are more than 500.000 ha. of Eucalyptus plantations. There represent 3,5 % of the national forest and the 25 % of the timber harvested. Galicia monocultures of Eucalyptus globulus Labill. plantations cover 177.679 ha. and mixed stands of eucalyptus cover 200.000 ha. more. This high productivity has been powered by the absence of pests and pathogens. However, since 1991 the health and productivity of these stands has been threatened by the Eucalyptus snout beetle, which causes a…



Integration of DEM data with satellite imagery for forest change detection

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Álvarez Taboada, María Flor, Rodríguez Pérez, José Ramón, 1968-, Asenjo Gómez, A

In a standard supervised clasification, increases in land map classification accuracy have been obtained by including topographic attributes as inputs to the classification algorithm. In this study we investigate the potential of such data as a means to increase the accuracy of supervised forest change detection using Landsat 5 imagery in a target area located in El Bierzo (León). Pinus radiata plantations are the most important forest stands in this area, concening stocks and the economic…



Comparison of GPS receiver accuracy and precision in forest environments. Practical recommendations regarding methods and receiver selection

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez Pérez, José Ramón, 1968-, Álvarez Taboada, María Flor, Sanz Ablanedo, Enoc, Gavela, Antonio

Selecting the appropriate receiver and methods might be complicated when a major portion of GPS data collection is below forest canopies. This study compares recreational GPS receivers. It was aimed to determine the most suitable method and receiver for position assessment under different forest canopy covers, in terms of easiness of use, accuracy, realibility, and the ratio accuracy/cost. Data were collected in 17 forest locations and consisted of 3 measurements with each receiver per plot and…



An operational protocol for post-fire evaluation at landscape scale in an object-oriented environment.

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Álvarez Taboada, María Flor, Rodríguez Pérez, José Ramón, 1968-, Vega Nieva, D., Castedo Dorado, Fernando

Post-fire effect assessment and mapping in a very fragmented and diverse landscape is crucial to prioritize management actions, mainly when fires are very numerous and disperse. The processing protocol should be affordable and operational, in order to be applied when management decisions were required by the administration. The consistency and quality of the results in linked to the image processing stages to adress image radiometry, normalization, and computation of the spectral indices.



Problem Based Learning (PBL) and E-learning in geodetic engineering, cartography and surveying education in the European Higher Education Area (EHEA) frame. A case study in the University of Leon (Spain): experiences and results

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Álvarez Taboada, María Flor, Fernández Martínez, Marta, Rodríguez Pérez, José Ramón, 1968-, Sanz Ablanedo, Enoc

The concepts and strategies defined in the Bologna Process to develop a European Higher Education Area, involve a change in the educative programs, wich have to be adapted to innovative teaching and learning processes based on achieving specific knowledge according to the professional field of work. Thus, the method has to be focused in the learning process and not in the teaching process. Probelm Based Learning emphasises learning activities which are student-centred,interdisciplinary,…



Radiometric calibration and evaluation of ultracam X and XP using portable reflectance targets and spectometer data. Aplication to estract thematic data from imagery gathered by the national plan of aerial orthophotography (PNOA)

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Álvarez Taboada, María Flor, Catanzarite Torres, Tainy, Rodríguez Pérez, José Ramón, 1968-, Nafría, D.

Digital photogrammetric cameras obtain multispectral images with a high geometric accuracy and radiometric information which can be used for multiple purpose. The optimal use of this information requires a calibration and validation of the photogrammetric systems. Calibration is the process of defining the sensor response quantitatively to a known and controlled input signal.



Radiometric calibration of images from digital photogrammetric cameras to estimate biomass

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Álvarez Taboada, María Flor, Rodríguez Pérez, José Ramón, 1968-, Blanco Medina, Vicente del

Estimating and modelling biomass can be helpful for biomass management. It as also interesting to calculate the amount of biomass in a certain area for carbon implications, as indicated by the Kyoto protocol. In the past, remote sensing techniques have been able to estimate biomass by using reflectance in the both the red and the near infrared wavelengths. Nowadays the sensors in the digital photogrammetric cameras gather information not only in the visible wavelengths but also in the near…



Geometric stability and lens decentering in compact digital cameras

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Sanz Ablanedo, Enoc, Rodríguez Pérez, José Ramón, 1968-, Armesto, Julia, Álvarez Taboada, María Flor

P. 1553-1572, A study on the geometric stability and decentering present in sensor-lens systems of six identical compact digital cameras has been conducted. With regard to geometrical stability, the variation of internal geometry parameters (principal distance, principal point position and distortion parameters) was considered. With regard to lens decentering, the amount of radical and tangential displacement resulting from decentering distortion was related with the precision of the camera and with the…, SI



Metric potential of a 3D measurement system based on digital compact cameras

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Sanz Ablanedo, Enoc, Rodríguez Pérez, José Ramón, 1968-, Arias Sánchez, Pedro, Armesto, Julia

P. 4178-4194, This paper presents an optical measuring system based on low cost, hogh resolution digital cameras. Once the cameras are synchronised, the portable and adjuntable system can be used to observe living beings, bodies in motion, or deformations of very different sizes. Each of the cameras has been modelled individually and studied with regard to the photogrammetric potential of the system. We have investigated the photogrammetric precision obtained from the crossing of rays, the repeatability of…, SI



Technological Solutions for Electronic Voting and Guarantees of the Integrity of the Electoral Process. A Case Study

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Torre, Mario, Panizo Alonso, Luis

This paper attempts to show, on the basis of a specific example, that a balanced simple and transparent design for the process of identification and in-person electronic voting is essential to safeguard the basic rights of voters



Role of P73 and P53 in the biology of neural stem cells and in the architecture of the neurogenic niches in mouse brain = Función de P73 y P53 en la biología de las células troncales neuronales y en la arquitectura de los nichos neurogénicos en cerebro de ratón

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
González Cano, Laura

170 p., En su conjunto el presente trabajo de tesis doctoral demuestra que p73 desempeña un papel fundamental en la biología de las células troncales neurales: p73 es un regulador positivo en el mantenimiento de la capacidad de auto-renovación de las células troncales neurales, así como un regulador esencial en la transformación de las células de glia radial en los diferentes tipos celulares que componen los nichos neurogénicos y en los procesos de organización que culminan con la arquitectura típica…



Biocatalyzed electrolysis for wastewater treatment and hydrogen production = Tratamiento de aguas residuales con producción de hidrógeno por medio de electrolisis biocatalítica

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Escapa, Adrián

185 p., El objetivo principal de esta tesis es el estudio de la capacidad de la electrolisis biocatalítica (EB) para eliminar materia orgánica y generar energía durante el tratamiento de aguas residuales urbanas e industriales. Asimismo, se plantea la realización de una estimación de la viabilidad de una planta de tratamiento de aguas residuales urbanas en la cual se combina la EB con un tratamiento convencional de lodos activos



Application of satellite images to locate and inventory vineyards in the designation of origin "Bierzo" in Spain

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez Pérez, José Ramón, 1968-, Miranda Barrós, David, Álvarez, C. J.

P. 277-290, With a view to contributing to the improvement of the current vineyard registers, this study presents a methodology for vineyard mapping based on satellite remote sensing systems. The procedure was validated for the Designation of origin "Bierzo" in Spain. Different supervised classifications were performed besed on two Landsat images acquired in the same year. The objetives of the present study were to determine which classification yielded the best results and to quantify the…, SI



Efecto del ácido carnósico añadido a la dieta de corderos sobre el bienestar animal y la calidad de la carne = Effect of carnosic acid included in the diet of lambs on animal welfare and meat quality

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Morán Lobato, Lara

175 p., En los sistemas de producción animal intensivos actuales, el manejo y otras condiciones del ambiente, pueden inducir el incremento de la frecuencia cardíaca, presión sanguínea u otro conjunto de ajustes, que finalmente, promueven la ruptura del equilibrio existente entre la producción de especies reactivas del oxígeno y los mecanismos antioxidantes del propio animal, dando lugar a estrés oxidativo. El estrés oxidativo en el animal también puede ser promovido por el consumo de altos niveles de…



Evaluation of hyperspectral reflectance indexes to detect gravepine water status in vineyards

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez Pérez, José Ramón, 1968-, Riaño, David, Carlisle, Eli, Ustin, Susan L., Smart, David R.

P. 302-317, Irrigation scheduling is critical as it affects both fruit yield and composition. We examined the potential to use field-measured hyperspectral remote sensing data to stimate leaf water content, equivalent water thickness, and leaf water potential in a commercial vineyard of Vitis vinifera cv. Pinot noir, SI



Estimation of shub height for fuel-type mapping combining airborne LiDAR and simultaneous color infrared ortho imaging

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Riaño, David, Chuvieco Solnero, Emilio, Ustin, Susan L., Salas, Javier, Rodríguez Pérez, José Ramón, 1968-, Ribeiro, Luis M., Viegas, Domingos X., Moreno, José M., Fernández, Helena

P. 341-348, A fuel-type map of a predominantly shub-land area in central Portugal was generated for a fire research experimental site, by combining airborne light detection and ranging (LiDAR), and simultaneous color infrared ortho imaging. Since the vegetation canopy and the ground are too close together to be easily discerned by LiDAR pulses, standard of processing LiDAR data did not provide an accurate estimate of shrub height, SI



Assessment of low-cost GPS receiver accuracy and precision in forest environments

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez Pérez, José Ramón, 1968-, Álvarez Taboada, María Flor, Sanz Ablanedo, Enoc

P. 159-167, Selecting the apppropriate receiver is an issue when a major portion of global positioning system (GPS) data collection is below forest canopies. This study compares four low-cost GPS receivers, in order to determine the most suitable receiver for position assessment under differnt forest canopy covers, in terms of ease of use, accuracy, and relability. A total of 33 positional assessments were gathered per receiver, plot, and method, in 18 forest location., SI



Vineyard area estimation using medium spatial resolution satellite imagery

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rodríguez Pérez, José Ramón, 1968-, Álvarez López, Carlos José, Miranda Barrós, David, Álvarez Taboada, María Flor

P. 441-452, The European Union requires member states to estimate their wine growing potential. For this porpose, most member states have developed or updated vineyard registers. The present study suggests locating vineyards using medium spatial resolution satellite imagery. The work was carried out using Landsat images that were validated for the Designation of Origin "Bierzo", León, Spain, SI



Functional statistical techniques applies to vine leaf water content

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Ordoñez, C., Matías, J. M., Reyes, A. N., Rodríguez Pérez, José Ramón, 1968-, Martínez, Javier

P. 1116-1122, A statistical analysis of functional data, obtained as reflectance values measured using a hyperspectral sensor, was used to determine water content in vine leaves. Our study was conducted using a sample of 80 vine leaves whose water content was determined by calculating the weight difference between leaves before and after drying in an oven., SI



Use of WebQuest to improve Operating Systems learning

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Panizo Alonso, Luis, Fernández Díaz, Ramón Ángel, Sánchez, Lidia

The impact of the Internet on the Society also affects the learning at the University. Students not only use printed books and their own notes, but also the information available in the Net. WebQuests are learning tools that help the students use the Internet, but under the supervision of the professor, who have previously selected the most interesting sites to visit. An experience of using WebQuests with first year Computer Science students is shown, as well as the good results obtained, both…



Using Java and C# for educational simulators: the case of SIMPLE-2

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Fernández Díaz, Ramón Ángel, Panizo Alonso, Luis, Sánchez, Lidia

P. 77-92, Due to the impact of the new technologies in our Society, special efforts to use them for teaching-learning computer architectures have been done. This work presents a simulator of a simple architecture (Simple-2) using two different technologies: Java and C#. In the one hand, the Java version is an applet which runs inside a web browser; in the other hand, the C# version runs as an application that needs a virtual machine be installed in the system. The impact of both technologies on first…



A WebQuest Framework to Improve the Study of Deadlock and Process Synchronization

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Panizo Alonso, Luis, Fernández, Ramón, Sánchez, Lidia

P. 932-937, The impact of the Internet on Society also affects learning at University. Students use not only printed books and their own notes, but also the information available on the Net. WebQuests are learning tools that help the students use the Internet, but under the supervision of the lecturer, who has previously selected the most interesting sites to visit. An experience of using WebQuests with first year Computer Science students is shown, as well as the good results obtained both in the…, SI



Technical Audit of an Electronic Polling Station: A Case Study

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Alaiz Moretón, Héctor, Panizo Alonso, Luis, Fernández Díaz, Ramón Ángel, Alfonso Cendón, Javier

P. 16-30, This paper shows the lack of standard procedures to audit e-voting systems and also describes a practical process of auditing an e-voting experience based on a Direct-recording Electronic system (D.R.E). This system has been tested in a real situation, in the city council of Coahuila, Mexico, in November 2008. During the auditing, several things were kept in mind, in particular those critical in complex contexts, as democratic election processes are. The auditing process is divided into three…, SI



INTECO Webmessenger: Study of the Usability in Instant Messaging Systems

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Rivas, Lorena, Prieto, Juan, Lopez, Ana I., Riesco Granadino, Raúl, Alaiz Moretón, Héctor, Panizo Alonso, Luis

The main aim of this project is dual. Firstly, it is to achieve a complete analysis of the necessities of disabled people on the Internet. Secondly, it is intended to develop an instant messaging system based on the Windows Live Messenger whose requirements are defined over the previous analysis. This software is called INTECO Webmessenger



Asymmetry as an element of federalism: a theoretical speculation fifty years later-readress the Spanish case

Repositorio: BULERIA: Repositorio Institucional de la Universidad de León
Seijas Villadangos, Esther

P. 679-690, To define elements of asymmetry for Constitutional Law. Differentiated constitutional treatment legitimized for the positive recognition of having different types of singularities 8linguistic, juridical, fiscal)