Carlos Angel Iglesias

118 papers A 1B 8C 9Misc 4Journal 45Unranked 51
YearRankTypeTitle / Venue / Authors
2026 — conf
Evaluation of Diversity in LLM-Based News Discovery through an Agent-Based System.
ICAART (1)
Sergio Muñoz, Carlos Angel Iglesias
2024 J jnl
Exploiting Content Characteristics for Explainable Detection of Fake News.
Big Data Cogn. Comput.
Sergio Muñoz, Carlos Angel Iglesias
2024 J jnl
FRELSA: A dataset for frailty in elderly people originated from ELSA and evaluated through machine learning models.
Int. J. Medical Informatics
Matteo Leghissa, Álvaro Carrera, Carlos Angel Iglesias
2024 — conf
JobKG: A Knowledge Graph of the Romanian Job Market based on Natural Language Processing.
RuleML+RR (Companion)
Petre Caraiani, Liviu-Adrian Cotfas, Flavius Cosmin Darie, Camelia Delcea, Carlos Angel Iglesias, Radu Prodan
2023 J jnl
Applications of Knowledge Graphs in Telecommunication Systems Management.
IEEE Internet Comput.
F. Javier Zorzano Mier, Carlos Angel Iglesias
2023 J jnl
Machine learning approaches for frailty detection, prediction and classification in elderly people: A systematic review.
Int. J. Medical Informatics
Matteo Leghissa, Álvaro Carrera, Carlos Angel Iglesias
2023 C conf
SLIWC, Morality, NarrOnt and Senpy Annotations: four vocabularies to fight radicalization.
LDK
J. Fernando Sánchez-Rada, Oscar Araque, Guillermo García-Grao, Carlos Angel Iglesias
2022 J jnl
A text classification approach to detect psychological stress combining a lexicon-based feature framework with distributional representations.
Inf. Process. Manag.
Sergio Muñoz, Carlos Angel Iglesias
2022 J jnl
An Ensemble Method for Radicalization and Hate Speech Detection Online Empowered by Sentic Computing.
Cogn. Comput.
Oscar Araque, Carlos Angel Iglesias
2022 J jnl
GSITK: A sentiment analysis framework for agile replication and development.
SoftwareX
Oscar Araque, J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2022 J jnl
Prediction of stress levels in the workplace using surrounding stress.
Inf. Process. Manag.
Sergio Muñoz, Carlos Angel Iglesias, Oscar Mayora, Venet Osmani
2021 J jnl
An agent based simulation system for analyzing stress regulation policies at the workplace.
J. Comput. Sci.
Sergio Muñoz, Carlos Angel Iglesias
2021 — conf
GSI-UPM at IberLEF2021: Emotion Analysis of Spanish Tweets by Fine-tuning the XLM-RoBERTa Language Model.
IberLEF@SEPLN
Daniel Vera, Oscar Araque, Carlos Angel Iglesias
2020 J jnl
A Big Data Reference Architecture for Emergency Management.
Inf.
Carlos Angel Iglesias, Alfredo Favenza, Álvaro Carrera
2020 Misc conf
A Practical Demonstration of a Variable Incentive Model for Bike-Sharing Systems Based on Agent-Based Social Simulation.
PAAMS
Alberto López Santiago, Carlos Angel Iglesias, Álvaro Carrera
2020 J jnl
An Approach for Radicalization Detection Based on Emotion Signals and Semantic Similarity.
IEEE Access
Oscar Araque, Carlos Angel Iglesias
2020 B conf
Gamified Smart Objects for Museums Based on Automatically Generated Quizzes Exploting Linked Data.
Intelligent Environments
Alejandro López-Martínez, Carlos Angel Iglesias, Álvaro Carrera
2020 Misc conf
Improving Sustainable Mobility with a Variable Incentive Model for Bike-Sharing Systems Based on Agent-Based Social Simulation.
PAAMS
Alberto López Santiago, Carlos Angel Iglesias, Álvaro Carrera
2020 B ed.
Intelligent Environments 2020 - Workshop Proceedings of the 16th International Conference on Intelligent Environment, Madrid, Spain, 20-23 July 2020
Intelligent Environments (Workshops)
Carlos Angel Iglesias, Jose Ignacio Moreno Novella, Alessandro Ricci, Diego Rivera Pinto, Dumitru Roman
2020 J jnl
JAICOB: A Data Science Chatbot.
IEEE Access
Daniel Carlander-Reuterfelt, Álvaro Carrera, Carlos Angel Iglesias, Oscar Araque, J. Fernando Sánchez-Rada, Sergio Muñoz
2020 C conf
Radical Text Detection based on Stylometry.
ICISSP
Álvaro de Pablo, Oscar Araque, Carlos Angel Iglesias
2020 J jnl
Senpy: A framework for semantic sentiment and emotion analysis services.
Knowl. Based Syst.
J. Fernando Sánchez-Rada, Oscar Araque, Carlos Angel Iglesias
2019 J jnl
A Bayesian Argumentation Framework for Distributed Fault Diagnosis in Telecommunication Networks.
Sensors
Álvaro Carrera, Eduardo Alonso, Carlos Angel Iglesias
2019 J jnl
A framework for fake review detection in online consumer electronics retailers.
CoRR
Rodrigo Barbado, Oscar Araque, Carlos Angel Iglesias
2019 J jnl
A framework for fake review detection in online consumer electronics retailers.
Inf. Process. Manag.
Rodrigo Barbado, Oscar Araque, Carlos Angel Iglesias
2019 J jnl
A semantic data lake framework for autonomous fault management in SDN environments.
Trans. Emerg. Telecommun. Technol.
Fernando Benayas, Álvaro Carrera, Manuel García-Amado, Carlos Angel Iglesias
2019 J jnl
A semantic similarity-based perspective of affect lexicons for sentiment analysis.
Knowl. Based Syst.
Oscar Araque, Ganggao Zhu, Carlos Angel Iglesias
2019 — conf
GSI-UPM at SemEval-2019 Task 5: Semantic Similarity and Word Embeddings for Multilingual Detection of Hate Speech Against Immigrants and Women on Twitter.
SemEval@NAACL-HLT
Diego Benito, Oscar Araque, Carlos Angel Iglesias
2019 J jnl
Social context in sentiment analysis: Formal definition, overview of current trends and framework for comparison.
Inf. Fusion
J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2018 — conf
A Big Linked Data Toolkit for Social Media Analysis and Visualization Based on W3C Web Components.
OTM Conferences (2)
J. Fernando Sánchez-Rada, Alberto Pascual, Enrique Conde, Carlos Angel Iglesias
2018 — conf
A Cognitive Agent for Mining Bugs Reports, Feature Suggestions and Sentiment in a Mobile Application Store.
Innovate-Data
Sergio Muñoz, Oscar Araque, Antonio F. Llamas, Carlos Angel Iglesias
2018 J jnl
A cognitive assistant for learning java featuring social dialogue.
Int. J. Hum. Comput. Stud.
Miguel Coronado, Carlos Angel Iglesias, Álvaro Carrera, Alberto Mardomingo
2018 — conf
An Agent-Based Simulation Model for Emergency Egress.
DCAI (Special Sessions)
Álvaro Carrera, Eduardo Merino, Pablo Aznar, Guillermo Fernández, Carlos Angel Iglesias
2018 J jnl
An Emotion Aware Task Automation Architecture Based on Semantic Technologies for Smart Offices.
Sensors
Sergio Muñoz, Oscar Araque, J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2018 — conf
Analyzing Radicalism Spread Using Agent-Based Social Simulation.
EMAS@AAMAS
Tasio Méndez, J. Fernando Sánchez-Rada, Carlos Angel Iglesias, Paul Cummings
2018 J jnl
Editorial for the Special Issue on "Love & Hate in the Time of Social Media and Social Networks".
Inf.
Carlos Angel Iglesias, Viviana Patti
2018 J jnl
Exploiting semantic similarity for named entity disambiguation in knowledge graphs.
Expert Syst. Appl.
Ganggao Zhu, Carlos Angel Iglesias
2018 — conf
How Well Do Spaniards Sleep? Analysis of Sleep Disorders Based on Twitter Mining.
SNAMS
Daniel Suarez, Oscar Araque, Carlos Angel Iglesias
2018 J jnl
MixedEmotions: An Open-Source Toolbox for Multimodal Emotion Analysis.
IEEE Trans. Multim.
Paul Buitelaar, Ian D. Wood, Sapna Negi, Mihael Arcan, John P. McCrae, Andrejs Abele, Cécile Robin, Vladimir Andryushechkin, Housam Ziad, Hesam Sagha, Maximilian Schmitt, Björn W. Schuller, J. Fernando Sánchez-Rada, Carlos Angel Iglesias, Carlos Navarro, Andreas Giefer, Nicolaus Heise, Vincenzo Masucci, Francesco A. Danza, Ciro Caterino, Pavel Smrz, Michal Hradis, Filip Povolný, Marek Klimes, Pavel Matejka, Giovanni Tummarello
2018 — conf
Towards an autonomic Bayesian fault diagnosis service for SDN environments based on a big data infrastructure.
SDS
Fernando Benayas, Álvaro Carrera, Carlos Angel Iglesias
2017 J jnl
A modular architecture for intelligent agents in the evented web.
Web Intell.
J. Fernando Sánchez-Rada, Carlos Angel Iglesias, Miguel Coronado
2017 J jnl
Computing Semantic Similarity of Concepts in Knowledge Graphs.
IEEE Trans. Knowl. Data Eng.
Ganggao Zhu, Carlos Angel Iglesias
2017 J jnl
Enhancing deep learning sentiment analysis with ensemble techniques in social applications.
Expert Syst. Appl.
Oscar Araque, Ignacio Corcuera-Platas, J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2017 Misc conf
Modeling Social Influence in Social Networks with SOIL, a Python Agent-Based Social Simulator.
PAAMS
Eduardo Merino, Jesús M. Sánchez, David García, J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2017 — conf
Multimodal multimodel emotion analysis as linked data.
ACII Workshops
J. Fernando Sánchez-Rada, Carlos Angel Iglesias, Hesam Sagha, Björn W. Schuller, Ian D. Wood, Paul Buitelaar
2017 — conf
Neural domain adaptation of sentiment lexicons.
ACII Workshops
Oscar Araque, Marco Guerini, Carlo Strapparava, Carlos Angel Iglesias
2017 J jnl
Sematch: Semantic similarity framework for Knowledge Graphs.
Knowl. Based Syst.
Ganggao Zhu, Carlos Angel Iglesias
2017 Misc conf
Soil: An Agent-Based Social Simulator in Python for Modelling and Simulation of Social Networks.
PAAMS
Jesús M. Sánchez, Carlos Angel Iglesias, J. Fernando Sánchez-Rada
2016 J jnl
A Participatory Agent-Based Simulation for Indoor Evacuation Supported by Google Glass.
Sensors
Jesús M. Sánchez, Álvaro Carrera, Carlos Angel Iglesias, Emilio Serrano
2016 — conf
Mining the Opinionated Web: Classification and Detection of Aspect Contexts for Aspect Based Sentiment Analysis.
ICDM Workshops
Oscar Araque, Ganggao Zhu, Manuel García-Amado, Carlos Angel Iglesias
2016 — conf
Mixed Emotions - Social Semantic Emotion Analysis for Innovative Multilingual Big Data Analytics Markets.
EPS
Carlos Angel Iglesias, J. Fernando Sánchez-Rada, Paul Buitelaar, Francesco A. Danza
2016 J jnl
Onyx: A Linked Data approach to emotion representation.
Inf. Process. Manag.
J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2016 B conf
Senpy: A Pragmatic Linked Sentiment Analysis Framework.
DSAA
J. Fernando Sánchez-Rada, Carlos Angel Iglesias, Ignacio Corcuera, Oscar Araque
2016 B conf
Smart Office Automation Based on Semantic Event-Driven Rules.
Intelligent Environments (Workshops)
Sergio Muñoz, Antonio F. Llamas, Miguel Coronado, Carlos Angel Iglesias
2016 — conf
SmartSim: Improving Visualization on Social Simulation for an Emergency Evacuation Scenario.
AmILP@ECAI
Antonio M. Diaz, Ganggao Zhu, Álvaro Carrera, Carlos Angel Iglesias, Oscar Araque
2016 J jnl
Task Automation Services: Automation for the Masses.
IEEE Internet Comput.
Miguel Coronado, Carlos Angel Iglesias
2016 J jnl
Validating viral marketing strategies in Twitter via agent-based social simulation.
Expert Syst. Appl.
Emilio Serrano, Carlos Angel Iglesias
2015 — conf
A Linked Data Model for Multimodal Sentiment and Emotion Analysis.
LDL@IJCNLP
J. Fernando Sánchez-Rada, Carlos Angel Iglesias, Ronald Gil
2015 — conf
A Novel Agent-Based Rumor Spreading Model in Twitter.
WWW (Companion Volume)
Emilio Serrano, Carlos Angel Iglesias, Mercedes Garijo
2015 — conf
A Survey of Twitter Rumor Spreading Simulations.
ICCCI (1)
Emilio Serrano, Carlos Angel Iglesias, Mercedes Garijo
2015 C conf
A personal agents hybrid architecture for question answering featuring social dialog.
INISTA
Miguel Coronado, Carlos Angel Iglesias, Alberto Mardomingo
2015 J jnl
A systematic review of argumentation techniques for multi-agent systems research.
Artif. Intell. Rev.
Álvaro Carrera, Carlos Angel Iglesias
2015 — conf
Aspect Based Sentiment Analysis of Spanish Tweets.
TASS@SEPLN
Oscar Araque, Ignacio Corcuera, Constantino Román, Carlos Angel Iglesias, J. Fernando Sánchez-Rada
2015 J jnl
Modelling rules for automating the Evented WEb by semantic technologies.
Expert Syst. Appl.
Miguel Coronado, Carlos Angel Iglesias, Emilio Serrano
2015 — conf
Sematch: Semantic Entity Search from Knowledge Graph.
SumPre-HSWI@ESWC
Ganggao Zhu, Carlos Angel Iglesias
2015 — conf
Towards fault diagnosis based on agent technology for wireless sensor networks.
FGCT
Álvaro Carrera, Carlos Angel Iglesias
2014 J jnl
A Framework for Goal-Oriented Discovery of Resources in the RESTful Architecture.
IEEE Trans. Syst. Man Cybern. Syst.
José Ignacio Fernández-Villamor, Carlos Angel Iglesias, Mercedes Garijo
2014 — conf
A Linked Data Approach to Sentiment and Emotion Analysis of Twitter in the Financial Domain.
WaSABi-FEOSW@ESWC
J. Fernando Sánchez-Rada, Marcos Torres, Carlos Angel Iglesias, Roberto Maestre, Esther Peinado
2014 J jnl
A real-life application of multi-agent systems for fault diagnosis in the provision of an Internet business service.
J. Netw. Comput. Appl.
Álvaro Carrera, Carlos Angel Iglesias, F. Javier García Algarra, Dusan Kolarík
2014 — conf
Ambient Intelligence Services Personalization via Social Choice Theory.
UCAmI
Emilio Serrano, Pablo Moncada, Mercedes Garijo, Carlos Angel Iglesias
2014 J jnl
Beast methodology: An agile testing methodology for multi-agent systems based on behaviour driven development.
Inf. Syst. Frontiers
Álvaro Carrera, Carlos Angel Iglesias, Mercedes Garijo
2014 — conf
EUROSENTIMENT: Linked Data Sentiment Analysis.
ISWC (Posters & Demos)
J. Fernando Sánchez-Rada, Gabriela Vulcu, Carlos Angel Iglesias, Paul Buitelaar
2014 J jnl
Evaluating social choice techniques into intelligent environments by agent based social simulation.
Inf. Sci.
Emilio Serrano, Pablo Moncada, Mercedes Garijo, Carlos Angel Iglesias
2014 — conf
MAIA: An Event-Based Modular Architecture for Intelligent Agents.
WI-IAT (3)
J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2013 J jnl
Classifying and comparing community innovation in Idea Management Systems.
Decis. Support Syst.
Adam Westerski, Theodore Dalamagas, Carlos Angel Iglesias
2013 — conf
Linguistic Linked Data for Sentiment Analysis.
LDL
Paul Buitelaar, Mihael Arcan, Carlos Angel Iglesias, J. Fernando Sánchez-Rada, Carlo Strapparava
2013 — conf
Onyx: Describing Emotions on the Web of Data.
ESSEM@AI*IA
J. Fernando Sánchez-Rada, Carlos Angel Iglesias
2012 J jnl
A Metadirectory of Web Components for Mashup Composition.
J. Univers. Comput. Sci.
José Ignacio Fernández-Villamor, Carlos Angel Iglesias, Mercedes Garijo
2012 — conf
A Semantic Metadirectory of Services Based on Web Mining Techniques.
AAAI Spring Symposium: Intelligent Web Services Meet Social Computing
José Ignacio Fernández-Villamor, Tilo Zemke, Carlos Angel Iglesias, Mercedes Garijo
2012 — conf
Application of semantic search in Idea Management Systems.
ICITST
Geovanny Poveda, Adam Westerski, Carlos Angel Iglesias
2012 — conf
B2DI - A Bayesian BDI Agent Model with Causal Belief Updating based on MSBN.
ICAART (2)
Álvaro Carrera, Carlos Angel Iglesias
2012 J jnl
First-Order Logic Rule Induction for Information Extraction in Web Resources.
Int. J. Artif. Intell. Tools
José Ignacio Fernández-Villamor, Carlos Angel Iglesias, Mercedes Garijo
2012 J jnl
From Mashups to Telco Mashups: A Survey.
IEEE Internet Comput.
Hendrik Gebhardt, Martin Gaedke, Florian Daniel, Stefano Soi, Fabio Casati, Carlos Angel Iglesias, Scott Wilson
2012 C conf
Hardware Reuse Improvement through the Domain Specific Language dHDL.
ISPA
Miguel Angel Sánchez, Marisa López-Vallejo, Carlos Angel Iglesias
2012 C conf
Idea relationship analysis in open innovation crowdsourcing systems.
CollaborateCom
Adam Westerski, Carlos Angel Iglesias, Javier Espinosa Garcia
2012 B conf
Improving Hardware Reuse through XML-based Interface Encapsulation.
ICECCS
Miguel Angel Sánchez, Marisa López-Vallejo, Carlos Angel Iglesias, Carlos A. López-Barrio
2012 B conf
Ranking Web Services using Centralities and Social Indicators.
ENASE
Tilo Zemke, José Ignacio Fernández-Villamor, Carlos Angel Iglesias
2012 — conf
Vulnerapedia: Security Knowledge Management with an Ontology.
ICAART (1)
Francisco J. Blanco, José Ignacio Fernández-Villamor, Carlos Angel Iglesias
2011 — conf
A Semantic Scraping Model for Web Resources - Applying Linked Data to Web Page Screen Scraping.
ICAART (2)
José Ignacio Fernández-Villamor, Jacobo Blasco-García, Carlos Angel Iglesias, Mercedes Garijo
2011 — conf
Exploiting Structured Linked Data in Enterprise Knowledge Management Systems: An Idea Management Case Study.
EDOCW
Adam Westerski, Carlos Angel Iglesias
2011 C conf
Improving Diagnosis Agents with Hybrid Hypotheses Confirmation Reasoning Techniques.
EUMAS
Álvaro Carrera, Carlos Angel Iglesias
2011 — conf
Linked Opinions: Describing Sentiments on the Structured Web of Data.
SDoW@ISWC
Adam Westerski, Carlos Angel Iglesias, Fernando Tapia Rico
2011 — conf
Multi-agent Architecture for Heterogeneous Reasoning under Uncertainty Combining MSBN and Ontologies in Distributed Network Diagnosis.
IAT
Álvaro Carrera, Carlos Angel Iglesias
2011 J jnl
The road from community ideas to organisational innovation: a life cycle survey of idea management systems.
Int. J. Web Based Communities
Adam Westerski, Carlos Angel Iglesias, Tadhg Nagle
2010 — conf
A Model for Integration and Interlinking of Idea Management Systems.
MTSR
Adam Westerski, Carlos Angel Iglesias, Fernando Tapia Rico
2010 — conf
A Pattern Approach to Modeling the Provider Selection Problem.
ICAART (2)
José Javier Durán, Carlos Angel Iglesias
2010 B conf
A Vocabulary for the Modelling of Image Search Microservices.
ENASE
José Ignacio Fernández-Villamor, Carlos Angel Iglesias, Mercedes Garijo
2010 C conf
A component library to improve the reusability in the development of converged services.
iiWAS
Laura Díaz-Casillas, Carlos Angel Iglesias, Miguel Nieto
2010 — conf
Microservices - Lightweight Service Descriptions for REST Architectural Style.
ICAART (1)
José Ignacio Fernández-Villamor, Carlos Angel Iglesias, Mercedes Garijo
2010 — conf
ROMULUS: Domain Driven Design and Mashup Oriented Development Based on Open Source Java Metaframework for Pragmatic, Reliable and Secure Web Development.
CSMR
Boni García, Juan C. Dueñas, José Ignacio Fernández-Villamor, Adam Westerski, Mercedes Garijo, Carlos Angel Iglesias
2010 — conf
The Provider Rating Agreement Pattern for Solving the Provider Selection Problem.
ICAART (Revised Selected Papers)
José Javier Durán, Carlos Angel Iglesias
2009 B conf
A Hybrid Collaborative Filtering System for Contextual Recommendations in Social Networks.
Discovery Science
Jorge Gonzalo-Alonso, Paloma de Juan, Elena Garcí-a-Hortelano, Carlos Angel Iglesias
2009 — conf
Agreement Patterns.
WAT
Carlos Angel Iglesias, Mercedes Garijo, José Ignacio Fernández-Villamor, José Javier Durán
2009 C conf
Improving Searchability of a Music Digital Library with Semantic Web Technologies.
SEKE
Paloma de Juan, Carlos Angel Iglesias
2009 — conf
VMAP: A Dublin Core Application Profile for Musical Resources.
MTSR
Carlos Angel Iglesias, Mercedes Garijo, Daniel Molina, Paloma de Juan
2008 C conf
A comparison model for agile web frameworks.
EATIS
José Ignacio Fernández-Villamor, Laura Díaz-Casillas, Carlos Angel Iglesias
2002 — conf
Engineering Agent Systems for Decision Support.
ESAW
Sascha Ossowski, Josefa Z. Hernández, Carlos Angel Iglesias, Alberto Fernández
2000 — conf
An agent architecture to fulfill real-time requirements.
Agents
Ignacio Soto, Mercedes Garijo, Carlos Angel Iglesias, Manuel Ramos
1999 — conf
An Agent-Based Operational Model for Hybrid Connectionist-Symbolic Learning.
IWANN (2)
José Centeno-González, Juan R. Velasco, Carlos Angel Iglesias
1999 J jnl
Hardware-Software Partitioning at the Knowledge Level.
Appl. Intell.
Marisa Luisa López-Vallejo, Juan Carlos López, Carlos Angel Iglesias
1998 — conf
A Fuzzy-neural Multiagent System for Optimisation of a Roll-mill Application.
IEA/AIE (Vol. 1)
Carlos Angel Iglesias, José Centeno-González, Juan R. Velasco
1998 A conf
A Knowledge-based System for Hardware-Software Partitioning.
DATE
Marisa Luisa López-Vallejo, Carlos Angel Iglesias, Juan Carlos López
1998 — conf
A Survey of Agent-Oriented Methodologies.
ATAL
Carlos Angel Iglesias, Mercedes Garijo, José Centeno-González
1998 — conf
Applying the Propose&Revise Strategy to the Hardware-Software Partitioning Problem.
IEA/AIE (Vol. 1)
Marisa Luisa López-Vallejo, Carlos Angel Iglesias, Juan Carlos López
1998 J jnl
Metodologías orientadas a agentes.
Inteligencia Artif.
Carlos Angel Iglesias, Mercedes Garijo, José Centeno-González
1997 — conf
Analysis and Design of Multiagent Systems Using MAS-Common KADS.
ATAL
Carlos Angel Iglesias, Mercedes Garijo, José Centeno-González, Juan R. Velasco
1997 — conf
PENCACOLAS: Groupware for Learning.
CRIWG
O. M. González, María Jesús Verdú, Yannis A. Dimitriadis, César A. Osuna, Carlos Angel Iglesias, J. López
1995 — conf
MIX: A General Purpose Multiagent Architecture.
ATAL
Carlos Angel Iglesias, José Centeno-González, Juan R. Velasco