Creating and sharing knowledge for telecommunications
... Rui Jorge Morais Tomaz Valadas

Researcher

Rui Valadas

Academic position: Full Professor
Joining date: 01-03-1998
Roles in IT: Researcher
Scientific Area: Networks and Multimedia
Group: Network Architecture and Protocols – Lx

Email: Send Email
Address: IT – Lisboa
Instituto Superior Técnico - Torre Norte - Piso 10
Av. Rovisco Pais, 1
1049 - 001 Lisboa
Tel: +351 21 841 84 54
Fax: +351 21 841 84 72

Personal page


Scientific Achievements

  • Agregação, Universidade de Aveiro, 01-01-2004
  • PhD, Universidade de Aveiro, 01-01-1996
  • Universidade de Aveiro, 01-01-1986, Professor Associado c/ Agregação
Co-Supervision of theses
  • Mecanismos de Avaliação da Qualidade de Serviço das Redes IP, Research Grant, João Silva, 09-2007
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, Markovian Modelling of Internet Traffic, Chapter in, Performance Handbook in Next Generation Internet: Performance Evaluation & Applications, D. Kouvatsos, Springer, Berlin-Heidelberg, 2011
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, A Hierarchical Approach based on MMPPs for Modelling Self-similar Traffic over Multiple Time Scales, Chapter in, Heterogeneous Networks: Vol. I - Traffic Engineering, Performance Evaluation Studies & Tools, Demetres Kouvatsos, Elsevier Science, 2009
  • J. Gonçalves, P. Salvador, A. N. Nogueira, R. Valadas, Peer-Level Analysis of Distributed Multimedia Content Sharing, Chapter in, Traffic Management and Traffic Engineering for the Future Internet, Rui Valadas and Paulo Salvador, Springer, Berlin Heidelberg New York, 2009
  • R. Oliveira, A. Pacheco, C. Pascoal, R. Valadas, P. Salvador, On the Dependencies between Internet Flow Characteristics, Chapter in, Traffic Management and Traffic Engineering for the Future Internet, Rui Valadas and Paulo Salvador, Springer, Berlin Heidelberg New York, 2009
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, Modeling IP Traffic Behavior through Markovian Models, Chapter in, Encyclopedia of Internet Technologies and Applications, Mário Freire and Manuela Pereira, Idea-Group Inc., Hershey, 2007
  • A. N. Nogueira, P. Salvador, R. Valadas, A Framework for Detecting Internet Applications, Chapter in, Lecture Notes in Computer Science, Springer-Verlag Berlin, Springer, Berlin, 2007
  • R. Valadas, M.R.O de Oliveira, S. Leal, Anomaly Detection of Internet Traffic using Robust Feature Selection based on Kernel Density Estimation, European Conf. on Networks and Communications - EUCNC, Paris, France, Vol., pp. -, June, 2015 | BibTex
  • M.R.O de Oliveira, J.J.D.N Neves, R. Valadas, P. Salvador, Do we need a perfect ground-truth for benchmarking Internet traffic classifiers?, IEEE International Conf. on Computer Communications - INFOCOM, Hong Kong, China, Vol. 0, pp. 0 - 0, April, 2015 | BibTex
  • C. Pascoal, R. Oliveira, R. Valadas, P. F. Filzmoser, A. Pacheco, P. Salvador, Robust Feature Selection and Robust PCA for Internet Traffic Anomaly Detection, IEEE INFOCOM, Orlando, United States, Vol. 2012, pp. 1755 - 1763, March, 2012,
    | Abstract
    | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, Joint Modeling of Network Related Events with Multi-Dimensional Markov Modulated Deterministic Processes, IEEE International Conf. on Software, Telecommunications and Computer Networks - SoftCOM, Hvar, Croatia, Vol. --, pp. -- - --, September, 2011 | BibTex
  • A. N. Nogueira, P. Salvador, E. Rocha, R. Valadas, Emulation Environment for Ground Truth Establishment, International Conf. on Emerging Network Intelligence - Emerging, Florence, Italy, Vol. --, pp. -- - --, October, 2010 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Markovian Models for Medical Signals on Wireless Sensor Networks, IEEE International Workshop on Medical Applications Networking - MAN 2009, Dresden, Germany, Vol. -, pp. - - -, June, 2009 | BibTex
  • P. Salvador, A. N. Nogueira, U.F. França, R. Valadas, Framework for Zombie Detection using Neural Networks, IARIA International Conf. on Internet Monitoring and Protection - ICIMP, Venice, Italy, Vol. -, pp. - - -, May, 2009 | BibTex
  • C. Monteiro, P. Salvador, A. N. Nogueira, R. Valadas, Integrated System for Collecting, Processing and Storing Network Information, Conf. on Telecommunications - ConfTele, Santa Maria da Feira, Portugal, Vol. -, pp. - - -, May, 2009 | BibTex
  • JG Gonçalves, P. Salvador, A. N. Nogueira, R. Valadas, Peer Level Analysis of Distributed Multimedia Content Sharing, International Workshop on Traffic Management and Traffic Engineering for the Future Internet (FITraMEn 08), Porto, Portugal, Vol. -, pp. - - -, December, 2008 | BibTex
  • P. Salvador, A. N. Nogueira, U.F. França, R. Valadas, Detection of Illicit Traffic using Neural Networks, International Conf. on Security and Cryptography - SECRYPT, Porto, Portugal, Vol. --, pp. -- - --, July, 2008 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Identifying Differentiating Characteristics of Internet Applications using Principal Component Analysis, International Symp. on Communication Systems and Digital Signal Processing, Graz, Austria, Vol. 1, pp. 1 - 1, July, 2008 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Identification of Peer-to-peer Applications' Flow Patterns, International Conf. on Next Generation Internet Networks - NGI, Krakow, Poland, Vol. -, pp. - - -, April, 2008 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Framework for Wireless Networks Management based on Network and Traffic Modeling with QoS Objectives, Forth EuroFGI Workshop on Wireless and Mobility, Barcelona, Spain, Vol. -, pp. - - -, January, 2008 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Modeling Access Networks for QoS Prediction, Workshop on IP QoS and Traffic Control, Lisboa, Portugal, Vol. -, pp. - - -, December, 2007 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Local Area Network Modeling for Performance Prediction, IEEE Conf. on Local Computer Networks, Dublin, Ireland, Vol. -, pp. - - -, October, 2007 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Module for Identifying Internet Applications and its Integration in a Peer-to-peer Measurement Tool, IADIS International Conf. – Telecommunications, Networks and Systems, Lisboa, Portugal, Vol. -, pp. - - -, July, 2007 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Joint Modeling of MANET Characteristics for QoS Prediction, IEEE International Symp. on Computers and Communications - ISCC, Aveiro, Portugal, Vol. -, pp. - - -, July, 2007 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Predicting QoS Characteristics on Wireless Networks, International Conf. on Networking and Services - ICNS, Athens, Greece, Vol. -, pp. - - -, June, 2007 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Predicting the Quality of Service of Wireless LANs using Neural Networks, ACM/IEEE International Symp. on Modeling, Analysis International Symp. on Modeling, Analysis and Simulation of Wireless and Mobile Systems - MSWIM, Torremolinos, Spain, Vol. 1, pp. 52 - 60, October, 2006 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Detecting Internet Applications Using Neural Networks, IARIA International Conf. on Networking and Services - ICNS, Silicon Valey, United States, Vol. 1, pp. 1 - 10, June, 2006 | BibTex
  • S. Sargento, R. Valadas, Cross-Traffic Estimation in IP Networks, IFIP TC6 Networking Conf., Coimbra, Portugal, Vol. 1, pp. 1 - 1, May, 2006 | BibTex
  • S. Sargento, R. Valadas, Capacity and Cross-Traffic Estimation of All Links in a Path Using ICMP Timestamps, International Conf. on Networking - ICN, 1, Mauritius, Vol. 1, pp. 1 - 1, April, 2006 | BibTex
  • H.V. Veiga, R. Valadas, P. Salvador, A. N. Nogueira, T.P. Pfeiffenberger, F.S. Strohmeier, OWAMP Performance and Interoperability Tests, International Workshop on Internet Performance, Simulation, Monitoring and Measurement - IPS-MOME, Salzburg, Austria, Vol. -, pp. - - -, February, 2006 | BibTex
  • A. N. Nogueira, R. Oliveira, P. Salvador, R. Valadas, Using Neural Networks to Classify Internet Users, Advanced International Conf. on Telecommunications, Lisbon, Portugal, Vol. --, pp. -- - --, July, 2005 | BibTex
  • A. N. Nogueira, R. Oliveira, P. Salvador, R. Valadas, A. Pacheco, Classification of Internet users using discriminant analysis and neural networks, Conf. on Computer Networks, Rome, Italy, Vol. 1, pp. 1 - 1, April, 2005 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, Multilayer Markov modulated Poisson process for modeling self-similar traffic, International Conf. on Telecommunications - ICT, Tomar, Portugal, Vol. 1, pp. 1 - 1, April, 2005 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, A. Pacheco, Multi-time-scale traffic modeling using Markovian and L-Systems models, European Conf. on Universal Multiservice Networks - ECUMN, Porto, Portugal, Vol. 3262, pp. 297 - 306, October, 2004 | BibTex
  • TP Pinho, J. L. Oliveira, R. Valadas, P. Salvador, A. N. Nogueira, Implementação, validação e exploração do sistema de monitorização activa OWAMP, Conf. sobre Redes de Computadores - CRC, Leiria, Portugal, Vol. ??, pp. ?? - ??, October, 2004 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, Markovian approach for modeling IP traffic behavior on different time scales, SPIE Conf. on Performance and Control of Next Generation Communication Networks, Orlando, United States, Vol. 5244, pp. 29 - 40, September, 2003 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Framework based on stochastic L-Systems for modeling IP traffic with multifractal behavior, SPIE Conf. on Performance and Control of Next Generation Communication Networks, Orlando, United States, Vol. 5244, pp. 18 - 28, September, 2003 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Joint Characterization of the Packet Arrival and Packet Size Processes of Multifractal Traffic based on Stochastic L-Systems, International Teletraffic Congress, Berlin, Germany, Vol. cdrom, pp. cdrom - cdrom, August, 2003 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, Modeling Self-Similar Traffic through Markov Modulated Poisson Processes over Multiple Time Scales, IEEE International Conf. on High-Speed Networks and Multimedia Communications - HSNMC, Estoril, Portugal, Vol. 1, pp. 550 - 560, July, 2003 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, A. Pacheco, A Hierarchical Approach Based on MMPPs for Modeling Self-Similar Traffic over Multiple Time Scales, International Working Conf. on Performance Modeling and Evaluation of Heterogeneuous Networks - HET-NETs, Ilkley, United Kingdom, Vol. 1, pp. 37/1 - 37/13, July, 2003 | BibTex
  • R. Oliveira, R. Valadas, A. Pacheco, P. Salvador, Cluster Analysis of Internet Users Based on Hourly Traffic Utilization, International Working Conf. on Performance Modeling and Evaluation of Heterogeneuous Networks - HET-NETs, Ilkley, West Yorkshire, United Kingdom, Vol. 1, pp. 37/1 - 37/13, July, 2003 | BibTex
  • L. Gouveia, P. Patrício, A. F. Sousa, R. Valadas, MPLS over WDM Network Design with Packet Level QoS Constraints based on ILP Models, IEEE INFOCOM, San Francisco, United States, Vol. 1, pp. 576 - 586, April, 2003 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Modeling Network Traffic with Multifractal Behavior, International Conf. on Telecommunications - ICT, Papeete, French Polynesia, Vol. II, pp. 1071 - 1077, February, 2003 | BibTex
  • S. Sargento, R. Valadas, Tradeoffs between Signaling and Resource Utilization in DiffServ Networks with Hierarchical Aggregation, Joint International Workshops on Interactive Distributed Multimedia Systems and Protocols for Multimedia Systems - IDMS/PROMS., Coimbra, Portugal, Vol. 1, pp. 1 - 1, November, 2002 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Modeling Multifractal Traffic with Stochastic L-Systems, IEEE Global Telecommunications Conf. - GLOBECOM, Taipei, Taiwan, Vol. Cdrom, pp. Cdrom - Cdrom, November, 2002 | BibTex
  • S. Sargento, R. Valadas, Performance of Hierarchical Aggregation in Differentiated Services Networks, International Conf. on Telecommunication Systems, Modeling and Analysis - ICTSM, Monterey, United States, Vol. 1, pp. 1 - 1, October, 2002 | BibTex
  • P. Salvador, R. Valadas, A. Pacheco, Multiscale Fitting Procedure for Markov Modulated Poisson Processes, International Conf. on Telecommunication Systems, Modeling and Analysis - ICTSM, Monterey, United States, Vol. 1, pp. 304 - 318, October, 2002 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Modeling Multifractal IP Traffic: Characterization of Packet Arrivals and Packet Sizes using Stochastic L-Systems, International Conf. on Telecommunication Systems, Modeling and Analysis - ICTSM, Monterey, United States, Vol. 2, pp. 577 - 587, October, 2002 | BibTex
  • R. Salgado, R. Valadas, S. Sargento, R. Cadime, J. Gonçalves, A Demonstrator of an IP-based Access Network for Broadband Multimedia Services, International Conf. on Telecommunication Systems, Modeling and Analysis - ICTSM, California, United States, Vol. N/A, pp. N/A - N/A, October, 2002 | BibTex
  • L. Cardoso, J. Patrão, A. F. Sousa, R. Valadas, Combining Node and Link Dimensioning for MPLS Networks, International Telecommunication Network Strategy and Planning Symp. - Networks, Munich, Germany, Vol. 1, pp. 1 - 1, June, 2002 | BibTex
  • S. Sargento, R. Salgado, M. Carmo, V. Marques, R. Valadas, An Experimental Study of Probing-Based Admission Control for DiffServ Architectures, IFIP TC6 Networking Conf., Pisa, Italy, Vol. 1, pp. 1 - 1, May, 2002 | BibTex
  • S. Sargento, R. Valadas, E. Knightly, Resource Stealing in Endpoint Controlled Multi-class Networks, International Workshop on Digital Communications, Taormina, Italy, Vol. 1, pp. 1 - 1, September, 2001 | BibTex
  • R. Aguiar, A. Tavares, L. Alves, R. Valadas, D. Santos, A Test Bed for Wireless Optical LANs, IEEE Conf. on Electronics, Circuits and System, Malta, Malta, Vol. 1, pp. 1 - 1, September, 2001 | BibTex
  • C. B. Lopes, A. F. Sousa, R. Valadas, Heuristics for dimensioning large-scale MPLS networks, SPIE – Internet Performance and Control of Network Systems, Denver, Colorado, United States, Vol. 4523, pp. 27 - 34, August, 2001 | BibTex
  • S. Sargento, R. Valadas, J. Gonçalves, IP Access Networks with QoS Support, SPIE – Technologies, Protocols, and Services for Next-Generation Internet, Denver, United States, Vol. 1, pp. 1 - 1, August, 2001 | BibTex
  • P. Salvador, R. Valadas, A Framework based on Markov Modulated Poisson Processes for Modeling Traffic with Long-Range Dependence, SPIE – Internet Performance and Control of Network Systems, Denver, United States, Vol. 4523, pp. 221 - 232, August, 2001 | BibTex
  • L. Cardoso, J. Patrão, C. B. Lopes, A. F. Sousa, R. Valadas, PTPlan MPLS: A Tool for MPLS Network Dimensioning, IEEE - International Symp. on Modeling, Analysis and Simulation of Computer and Telecommunication Systems, Cincinati, Ohio, United States, Vol. 1, pp. 1 - 1, August, 2001 | BibTex
  • A. N. Nogueira, R. Valadas, Analysing the relevant time scales in a network of queues, SPIE – Internet Performance and Control of Network Systems, Denver, United States, Vol. 4523, pp. 243 - 252, July, 2001 | BibTex
  • P. Salvador, R. Valadas, Modelling A Fitting Procedure for Markov Modulated Poisson Processes with an Adaptive Number of States, IFIP Working Conf. on Performance Modelling and Evaluation of ATM &IP Networks, Budapest, Hungary, Vol. 1, pp. 62 - 73, June, 2001 | BibTex
  • A. Tavares, R. Aguiar, R. Valadas, D. Santos, Advanced Technologies for Infrared Wireless Indoor Local Area Networks, International Conf. on Telecommunications - ICT, Figueira da Foz, Portugal, Vol. 1, pp. 68 - 72, April, 2001 | BibTex
  • S. Sargento, R. Valadas, E. Knightly, Call Admission Control in IP networks with QoS support, Conf. on Telecommunications - ConfTele, Figueira da Foz, Portugal, Vol. 1, pp. 1 - 1, April, 2001 | BibTex
  • L. Cardoso, J. Patrão, C. B. Lopes, A. F. Sousa, R. Valadas, A Tool for MPLS Traffic Engineering, Conf. on Telecommunications - ConfTele, Figueira da Foz, Portugal, Vol. 1, pp. 10 - 14, April, 2001 | BibTex
  • P. Salvador, A. N. Nogueira, R. Valadas, Modelling Local Area Network Traffic with Markovian Traffic Models, Conf. on Telecommunications - ConfTele, Figueira da Foz, Portugal, Vol., pp. -, March, 2001 | BibTex
  • A. F. Sousa, R. Valadas, L. Gouveia, Dimensioning ATM Networks using 2-Layer Hierarchical Virtual Path Layouts, International Conf. on Telecommunication Systems, Modeling and Analysis - ICTSM, Dallas, Texas, United States, Vol. 1, pp. 496 - 505, March, 2001 | BibTex
  • L. Cardoso, C. B. Lopes, A. F. Sousa, R. Valadas, A Tool for Multi-Hour ATM Network Design considering Mixed Peer-to-Peer and Client-Server based Services, International Telecommunication Network Strategy and Planning Symp. - Networks, Toronto, Canada, Vol. 1, pp. 1 - 1, September, 2000 | BibTex
  • A. N. Nogueira, R. Valadas, Analysing the Versatility of the 2-MMPP Traffic Model, International Symp. on Communication Systems and Digital Signal Processing, Bornemouth, United Kingdom, Vol. 1, pp. 261 - 266, July, 2000 | BibTex
  • A. N. Nogueira, P. Salvador, R. Valadas, Fitting Algorithms for ATM Traffic Models, Broadband Access Conf., Cracow, Poland, Vol. 1, pp. 167 - 174, October, 1999 | BibTex
  • S. Sargento, R. Valadas, A. F. Sousa, Dimensioning Methodologies for the BBL (BroadbandLoop) and FSAN (Full Services Access Networks) Access Networks, Broadband Access Conf., Krakow, Poland, Vol. 1, pp. 1 - 1, October, 1999 | BibTex
  • S. Sargento, R. Valadas, A. F. Sousa, Dimensioning Methodologies for the BroadbandLoop Access Network, European Conf. on Networks and Optical Communications - NOC, Delft, Netherlands, Vol. 1, pp. 1 - 1, June, 1999 | BibTex
  • R. Aguiar, A. Tavares, J. Cura, E. Vasconcelos, L. Alves, R. Valadas, D. Santos, Considerations on the design of transceivers for wireless optical LANs, IEE Colloquium on Optical Wireless Communications, London, United Kingdom, Vol. 2, pp. 1 - 17, June, 1999 | BibTex
  • A. F. Sousa, R. Valadas, L. Cardoso, A. M. O. D. Duarte, ATM Network Dimensioning for Mixed Symmetrical and Asymmetrical Services with Dynamic Reconfiguration in a Multi-Network Provider Environment, IFIP - Workshop on Traffic Management and Design of ATM Networks, London, United Kingdom, Vol. 1, pp. 5/1 - 5/15, April, 1999 | BibTex
  • R. Aguiar, R. Valadas, A. Moreira, C. Lomba, A. Tavares, A. F. Sousa, A. M. O. D. Duarte, Contribuições da Universidade de Aveiro para a Especificação da Rede de Área Local Não-Cablada IEEE 802.11, Conf. on Telecommunications - ConfTele, Aveiro, Portugal, Vol. 1, pp. 65 - 70, April, 1997 | BibTex

Currently running projects3

Acronym Name Funding Agency Start date Ending date
DARTEG Deteção de Ataques de Redirecionamento de Tráfego a uma Escala Global FCT/PTDC 01-05-2016 01-05-2018
DP-PMI Doctoral Programme in the Physics and Mathematics of Information: Foundations of Future Information Technologies (DP-PMI) FCT 01-01-2014 01-12-2021
QuNet QuNet - Quantum Telecommunication Networks IT 01-11-2016 01-10-2018

Closed Projects12

Acronym Name Funding Agency Start date Ending date
Aconselhamento quanto à evolução do estudo de aferição da Qualidade dos Serviços de Acesso à Internet do ICP-ANACOM ANACOM 01-01-2011 01-12-2011
AWARE2 Traffic analysis, modeling and measurements for the management of the future Internet FCT 01-01-2011 01-06-2013
Bots PTDC/EEA-TEL/101880/2008 - Design and Implementation of a BotNet Detection System FCT/PTDC 01-03-2010 01-09-2012
DMeSTrES Distributed Measurement System with Traffic Engineering Support IT/LA 01-06-2005 31-05-2007
EURO-NF EURO-NF – Anticipating the Network of the Future – From Theory to Design 01-01-2008 01-06-2012
Euro-NGI Design and Engineering of the Next Generation Internet, Towards Convergent Multi-Service Networks EU/FP6 01-12-2003 30-11-2006
MULTIDIM Dimensioning Multi-Service and Multi-Layer Networks: Optimization Models FCT/POSI 01-01-2002 31-12-2004
SCALE Statistical Characterization of Telecommunications Traffic FCT/POSI 01-01-2001 31-07-2001
SCALE II Trafic Modelling and Performance Evaluation of Multiservice Networks FCT/POSI 01-02-2002 31-01-2005
SCALE III Internet Traffic Measurements, Modelling and Statistical Analysis FCT/POSC 01-01-2005 31-12-2006
Sureté Security in TCP/IP Networks PT Inovação 01-06-2002 31-05-2003
TELEMAT Traffic Engineering for DiffServ/MPLS Networks PT Inovação 01-04-2001 31-03-2002