Dr. Alberto Sanchez
Universidad Rey Juan Carlos, Madrid - Spain
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Academic Career Length
23Years (2004-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 October 2013 in Future Generation Computer Systems
Journal Article
JMJesús Montes
Jesús MontesAlberto SanchezBMBunjamin Memishi
Bunjamin Memishi
MPMaría S. Pérez
María S. PérezGAGabriel Antoniu
Gabriel Antoniu
International audienceThe inherent complexity of modern cloud infrastructures has created the need for innovative monitoring approaches, as state-of-the-art solutions used for other large-scale environments do not address specific cloud features. Although cloud monitoring is nowadays an active research field, a comprehensive study covering all its aspects has not been presented yet. This paper provides a deep insight into cloud monitoring. It proposes a unified cloud monitoring taxonomy, based on which it defines a layered cloud monitoring architecture. To illustrate it, we have implemented GMonE, a general-purpose cloud monitoring tool which covers all aspects of cloud monitoring by specifically addressing the needs of modern cloud infrastructures. Furthermore, we have evaluated the performance, scalability and overhead of GMonE with Yahoo Cloud Serving Benchmark (YCSB), by using the OpenNebula cloud middleware on the Grid’5000 experimental testbed. The results of this evaluation demonstrate the benefits of our approach, surpassing the monitoring performance and capabilities of cloud monitoring alternatives such as those present in state-of-the-art systems such as Amazon EC2 and OpenNebula
7 May 2019 in IEEE Transactions on Emerging Topics in Computing
Journal Article
In recent years, virtual reality has experienced notorious technological advances in a quite short time. In an attempt to quickly response to this technical developments, some designs and developments of inmersive environments have caused different symptoms such as dizziness or disorientation. This work aims to analyze different methods of interaction and locomotion used in inmersive environments (Point of Interest, Gamepad, Teleport and Room-Scale) in three different aspects: presence, cybersickness and usability. We have designed and developed an experimental environment to carry out an empirical analysis with 48 subjects comparing the results obtained in different perceptual experiments. As a result, we provide a guideline for the use of these methods of interaction and locomotion in virtual reality.
12 August 2015 in IEEE Transactions on Visualization and Computer Graphics
Journal Article
MRManuel Rubio-Sanchez
Manuel Rubio-Sanchez
LRLaura Raya
Laura RayaFDFrancisco Diaz
Francisco Diaz
Alberto SanchezRadViz and star coordinates are two of the most popular projection-based multivariate visualization techniques that arrange variables in radial layouts. Formally, the main difference between them consists of a nonlinear normalization step inherent in RadViz. In this paper we show that, although RadViz can be useful when analyzing sparse data, in general this design choice limits its applicability and introduces several drawbacks for exploratory data analysis. In particular, we observe that the normalization step introduces nonlinear distortions, can encumber outlier detection, prevents associating the plots with useful linear mappings, and impedes estimating original data attributes accurately. In addition, users have greater flexibility when choosing different layouts and views of the data in star coordinates. Therefore, we suggest that analysts and researchers should carefully consider whether RadViz's normalization step is beneficial regarding the data sets' characteristics and analysis tasks.
1 June 2018 in Expert Systems with Applications
Journal Article
Alberto Sanchez
Cristina Soguero-RuizIMI. Mora-Jiménez
I. Mora-Jiménez
FRF.J. Rivas-Flores
F.J. Rivas-FloresDLD.J. Lehmann
D.J. Lehmann
MRM. Rubio-Sánchez
M. Rubio-Sánchez
26 June 2024 in Virtual Reality
Journal Article
The personalization of user experiences through recommendation systems has been extensively explored in Internet applications, but this has yet to be fully addressed in Virtual Reality (VR) environments. The complexity of managing geometric 3D data, computational load, and natural interactions poses significant challenges in real-time adaptation in these immersive experiences. However, tailoring VR environments to individual user needs and interests holds promise for enhancing user experiences. In this paper, we present Virtual Reality Environment Adaptation through Recommendations (VR-EAR), a framework designed to address this challenge. VR-EAR employs customizable object metadata and a hybrid recommendation system modeling implicit user feedback in VR environments. We utilize VR optimization techniques to ensure efficient performance. To evaluate our framework, we designed a virtual store where product locations dynamically adjust based on user interactions. Our results demonstrate the effectiveness of VR-EAR in adapting and personalizing VR environments in real time. domains.
1 January 2007 in Future Generation Computer Systems
Journal Article
MPMaría S. Pérez
María S. PérezAlberto SanchezVRVíctor Robles
Víctor Robles
Pilar Herrero-MartínJPJosé M. Peña
José M. Peña
About Me
Researcher with more than 15 years of experience in high-performance computing, parallelism, data analysis, information visualization and big data. He is the author of more than 50 international publications, including 22 publications included in the SCI JCR, most of them in Q1 and 5 articles in prestigious international congresses included in the CORE with 'A' ranking.
He has actively participated in different research projects, not only in national calls (PI of three of them) but also in international projects (for instance, the Human Brain Project, flagship of the European Union). In addition, he has carried out four research stays abroad at different recognized research centers: CERN (Switzerland), NeSC (United Kingdom), National Research Council (Canada) and University of Melbourne (Australia).
He has actively participated as a member of the scientific community, as a reviewer in multiple journals indexed in the JCR and congresses, and participating in multiple (more than 25) scientific and organization committees (IDA 2005, TrustCom 2010, HPCS 2012, CLUSTER 2014, CEIG 2018).
Finally, he has carried out different university management tasks, occupying positions of responsibility such as Head of the Master in Computer Graphics, Games and Virtual Reality, Vice-dean of students affairs or Vice Rector of Dogital Learning and IT.