Prof. Michael Logothetis
University of Patras, Patras, Greece
On the Digital Certificate Management in Advanced Metering Infrastructure Networks
Abstract: The smart grid (SG), generally referred to as the next-generation power system, is considered as a revolutionary and evolutionary regime of existing power grids. Among the emerging SG applications, the advanced metering infrastructure (AMI) enables automated, two-way communication between a smart meter (SM) and a public utility company. To authenticate a message, the sender (e.g., a SM) signs the message with its private key using a pre-defined digital signature algorithm. To verify the message, the recipient verifies the sender’s certificate and then the sender’s signature using the sender’s public key. In some cases, however, a previously issued certificate for a network node needs to be revoked. In this paper we investigate two possible approaches for the certificate management of SMs in AMI networks. These are based on the traditional certificate revocation lists (CRLs) and on the Bloom filters. We compare the two approaches in terms of the required packet size for the distribution of the revoked certificate serial numbers. We also discuss the advantages and limitations of each approach.
Biography: Michael D. Logothetis was born in Stenies, Andros, Greece, in 1959. He received his Dipl.-Eng. degree and Doctorate in Electrical Engineering, both from the University of Patras, Patras, Greece, in 1981 and 1990, respectively. From 1982 to 1990, he was a Teaching and Research Assistant at the Laboratory of Wire Communications, University of Patras, and participated in many national and EU research programmes, dealing with telecommunication networks, as well as with office automation (including natural language processing). From 1991 to 1992 he was Research Associate in NTT’s Telecommunication Networks Laboratories, Tokyo, Japan. Afterwards, he was a Lecturer in the Department of Electrical & Computer Engineering of the University of Patras, and since 2009 he has been elected (full) Professor in the same Department. He teaches the courses: Broadband Telecom Networks; Computer Networks, Teletraffic Theory, and Communications Systems. His research interests include teletraffic theory and engineering, traffic/network control, simulation and performance optimization of communications networks (Internet, Wireless, Optical NGN). He has published over 200 conference/journal papers and books/proceedings (more than 21 journals during the last seven years) and has over 767 third-party citations (h=15). He has published a teletraffic book in Greek (2nd issue in 2012). He has organised the 5th IEEE/IET International Conference on Communications Systems, Networks and Digital Signal Processing, CSNDSP 2006, sponsored mainly by IEEE, IET and OTE (Greek PTT), and the 4th IEICE Information and Communication Technology Forum, ICTF 2016, sponsored by IEICE (Japan). Since 2010, he is a member of the Steering Committee of the CSNDSP. He has reviewed many conference and journal papers. He served/is serving on the Technical Program Committee of several international conferences. Also, he has organized and chaired several technical sessions and has offered tutorial lectures in conferences. He has become a Guest Editor in five journals: a) Mediterranean Journal of Electronics and Communications, b) Mediterranean Journal of Computers and Networks, c) IET Circuits, Devices & Systems, d) IET Networks, and e) Ubiquitous Computing and Communication Journal. He participates in the Editorial Board of the following international journals: “IARIA International Journal On Advances in Telecommunications”, “Advances in Electronics and Telecommunications" – Poznan University of Technology, and “Hindawi Communications and Networking”. He is a member of the IARIA (Fellow Member), IEEE (Senior Member), IEICE, FITCE and the Technical Chamber of Greece (TEE).
Using Web of Science resources for research evaluation, publication planning and research monitoring
Abstract: The presentation shows the ways of using research analytics tools such as Web of Science, Endnote and InCites for determining research impact, identifying prospective research areas, choosing organizations and scientists for collaboration and monitoring the results of research activities. Also it touches interesting aspect of using bibliometrical data for creating the publication strategy and management of references and sources.
Biography: Marcin Kapczynski is Solutions and Customer Educationa specialists at Clarivate Analytics formerly Thomson Reuters Intellectual Property & Science. He has a started his career at Cardinal Wyszynski University in Warsaw at Psychology Department. His primary area of interest was measurement of individual differences, intelligence, cognitive styles, interpersonal competence and intellect diagnosis. With bibliometrics with since 2010. He is involved in shaping research evaluation process in Central and Eastern Europe countries such as Poland, Latvia, Lithuania and Slovakia. Member of committees, and participant of numerous scientific conferences. His main role is to provide a support for a research analytical and discovery tools such as Web of Science, InCites or Journal Citation Reports and also share an understanding and promote bibliometrics. He works with researchers, academics and librarians at all levels but also cooperate with governmental and corporate institutions offering his consultancy services.
Dr Adrian Kliks
Poznan University of Technology
Spectrum Management and Radio Resource Virtualization – a COHERENT approach
Abstract: A new and flexible approach to spectrum usage and management is required in order to fulfil the requirements identified by the 5G PPP in their KPIs for 5G networks, e.g., 1000 times higher mobile data volume per geographical area or 10 to 100 times more connected devices. Many spectrum sharing schemes have been proposed so far (such as LSA, CBRS with SAS, LAA/LWA), and some of them have been tested in the field trials providing useful insights into the spectrum sharing issues. From a real implementation perspective, the above solutions can be applied in various contexts (e.g., for TVWS, or with the use of dedicated databases supported by sensing function), however it is envisaged that more flexible approaches to spectrum sharing (such as innovative Pluralistic Licensing or various cognitive radio oriented schemes) should be pursued and investigated further. However, in conjunction with new approaches to spectrum management and sharing, the network architectures are evolving and incorporating concepts of virtualization and software control. A significant push towards Software Defined Networking (SDN) and Network Function Virtualization (NFV) is being made by all major players involved in realizing the 5G vision including researchers, network operators and regulators. In this talk, various spectrum management systems will be presented together with the analysis of prospective spectrum virtualization approaches that utilize network graphs. This talk will also cover selected findings from the COHERENT project.
Biography: Adrian Kliks received his M.Sc. and PhD degree in Telecommunication from Poznań University of Technology in 2005 and 2011, respectively, and since 2011 he is employed at the Chair of Wireless Communication in the position of assistant professor. His research interests cover the wide spectrum of wireless communications, in particular he is interested in new waveforms for future wireless systems (including orthogonal and non-orthogonal, as well as non-contiguous multicarrier schemes), in application of cognitive radio technology, in advanced spectrum management, but also in deployment and resource management in small-cells, and network virtualization. He was involved in preparation of national and international conferences, such as European Wireless 2012 conference (April 2012, Poznan, Poland), as well as workshops like CRAFT workshop at ISWCS 2013, 2014, and 2015, CRAFT workshop at PIMRC’2016, MACNET workshop at PIMRC2013, and a workshop on small-cells at IEEE WCNC’2014. In 2016 he was the main co-chair of the 13th Thirteenth International Symposium on Wireless Communication Systems (September 2016, Poznań, Poland). He was also the leading guest editor of the Special Issue on future heterogeneous networks that was published at EURASIP Journal on Wireless Communications and Networking. In 2012 he reached the status of IEEE Senior Member. He was/is involved in industrial and international projects (like ICT-URANUS, NoE NEWCOM++, NEWCOM#, COGEU, COHERENT, ACROPOLIS, COST Action IC-0902, COST-Terra), where he also acts/acted as the task and work-package leader. Currently, he participates in working groups established for definition of IEEE 1900.x standards on cognitive radio. From 2014 till 2016 he acted as the Membership Development/Web Visibility Chair at the IEEE ComSoc Europe Middle East Africa (EMEA) region.
Dr Ioannis Moscholios
University of Peloponnese, Tripolis, Greece
On the Fixed Channel Reservation Policy in LEO Mobile Satellite Systems
Abstract: In the presentation, the author will study a single link that accommodates Poisson arriving calls of different service-classes with different bandwidth requirements. The link is modelled as a loss system while the call admission mechanism is based on the Bandwidth Reservation (BR) policy. We name this model Erlang Multirate Loss Model (EMLM) under the BR policy (EMLM/BR). The BR policy achieves Call Blocking Probabilities (CBP) equalization among calls of different service-classes by reserving bandwidth units in favor of calls of certain service-classes. The existence of the BR policy in the EMLM/BR destroys reversibility in the corresponding Markov chains and therefore the steady state probabilities cannot be described by a product form solution. To determine CBP, the author studied and evaluated two convolution-based teletraffic loss models that exist in the literature.
Biography: Ioannis D. Moscholios received the Dipl.-Eng. degree in Electrical & Computer Engineering from the University of Patras, Patras, Greece, in 1999, the M.Sc. degree in Spacecraft Technology & Satellite Communications from the University College London, UK, in 2000 and the Ph.D. degree in Electrical & Computer Engineering from the University of Patras in 2005. From 2005 to 2009 he was a Research Associate at the Wire Communications Laboratory, Dept. of Electrical & Computer Engineering, University of Patras. From 2009 to 2013 he was a Lecturer at the Dept. of Telecommunications Science and Technology, University of Peloponnese, Tripolis, Greece. Currently, he is an Assistant Professor at the Dept. of Informatics & Telecommunications, University of Peloponnese. His research interests include teletraffic engineering, simulation and performance analysis of communication networks. He has published more than 130 papers in the context of international journals and conferences. He has served as a Guest Editor for IET Communications, IET Networks and Mobile Information Systems as well as an Associate Editor for IEICE Transactions on Communications. He is an IARIA Fellow and a Member of the Technical Chamber of Greece (TEE).
Dr Osamu Muta
An Analytical Framework for MIMO-OFDM systems with Adaptive Peak Amplitude Suppression
Abstract: Multiple-input multiple-output (MIMO) technology is considered as an effective approach to increase spectrum efficiency in wireless communications. Multi-carrier modulation techniques such as orthogonal frequency division multiplexing (OFDM) are widely investigated with MIMO systems for broadband communication over a frequency-selective fading channel. However, one of the major drawbacks in OFDM based systems is its high peak-to-average power ratio (PAPR). In this talk, an analytical framework for MIMO OFDM systems with a peak amplitude suppression scheme is presented. The results clarified theoretical relationship between PAPR and achievable BER in MIMO-OFDM systems with peak power suppression.
Biography: Osamu Muta received a B.E. degree from Ehime University, Ehime, Japan, in 1996, an M.E. degree from Kyushu Institute of Technology, Fukuoka, Japan, in 1998, and a Ph.D. degree from Kyushu University, Fukuoka, Japan in 2001. In 2001, he joined the Graduate School of Information Science and Electrical Engineering, Kyushu University as an assistant professor. Since 2010, he has been an associate professor in Center for Japan-Egypt Cooperation in Science and Technology, Kyushu University. His current research interests include signal transmission processing techniques for high-speed wireless communications and power-line communications, and nonlinear distortion compensation techniques for high-power amplifiers. He received the 2005 Active Research Award for excellent presentation from IEICE Radio Communication Systems.