Computer Technology Institute and Press

Pátra, Greece

Computer Technology Institute and Press

Pátra, Greece
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PubMed | University of Cantabria, Intel Corporation, Computer Technology Institute and Press, Institute for Advanced Architecture of Catalonia IAAC and Imperial College London
Type: Journal Article | Journal: Sensors (Basel, Switzerland) | Year: 2016

In recent years, the evolution of urban environments, jointly with the progress of the Information and Communication sector, have enabled the rapid adoption of new solutions that contribute to the growth in popularity of Smart Cities. Currently, the majority of the world population lives in cities encouraging different stakeholders within these innovative ecosystems to seek new solutions guaranteeing the sustainability and efficiency of such complex environments. In this work, it is discussed how the experimentation with IoT technologies and other data sources form the cities can be utilized to co-create in the OrganiCity project, where key actors like citizens, researchers and other stakeholders shape smart city services and applications in a collaborative fashion. Furthermore, a novel architecture is proposed that enables this organic growth of the future cities, facilitating the experimentation that tailors the adoption of new technologies and services for a better quality of life, as well as agile and dynamic mechanisms for managing cities. In this work, the different components and enablers of the OrganiCity platform are presented and discussed in detail and include, among others, a portal to manage the experiment life cycle, an Urban Data Observatory to explore data assets, and an annotations component to indicate quality of data, with a particular focus on the city-scale opportunistic data collection service operating as an alternative to traditional communications.

Soumplis P.,University of Patras | Soumplis P.,Computer Technology Institute and Press | Papanikolaou P.,University of Patras | Papanikolaou P.,Computer Technology Institute and Press | And 5 more authors.
2014 IEEE 19th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks, CAMAD 2014 | Year: 2014

Core networks offer high capacities by harvesting the high bandwidth-distance product of optical technologies. However they consume a non-negligible amount of power, while their traffic volume is forecasted to grow at very high rates for the 10 or 15 coming years. Thus, energy-efficiency in core and metro networks is mandatory for the sustainability of the future Internet. In this context, in this work we used Mantis, our network planning and operation tool, to design and carry out a comparative study of energy efficiency of current and next generation optical networks. In particular, we examined the cases of fixed-grid single-line-rate (SLR) Wavelength Division Multiplexing (WDM) optical networks, which are now deployed in the core, and next-generatoin mixed-line-rates (MLR) WDM and flex-grid networks. Under realistic network scenarios we profiled the total energy consumption of the optical layer and showed that through energy-aware algorithms we can achieve significant power savings. © 2014 IEEE.

Iliopoulou-Georgudaki J.,University of Patras | Kalogeras A.,Industrial Systems Institute | Konstantinopoulos P.,Computer Technology Institute and Press | Theodoropoulos C.,University of Patras
International Journal of Sustainable Development and World Ecology | Year: 2016

A process is presented to facilitate the sustainable management and development of tourist destinations. Based on a specific reforming of the Limits of Acceptable Change planning system and combined with the Tourism Carrying Capacity concept into a common framework, specific steps are described to integrate environmental, social and economic information of a tourist destination into indicators, which are afterwards compared with reference conditions. The Leopold matrix is applied to identify and classify restrictions of development and provide the basis for negotiations between managers, stakeholders and local communities. Through a feedback process of continuous monitoring and adjustment, the aim is to focus developmental activities on restricting factors until all indicators upgrade to reference. A case study at a Greek coastal municipality (Ilida - western Greece) is applied to demonstrate the process. Activity zones are identified and 18 indicators are selected. Results suggest high potential for tourism development of the area. However, low scores are assigned to 8/18 indicators, reflecting restrictions, requiring priority under a sustainable development plan. The proposed process offers managers and stakeholders the ability to easily visualize/identify restrictions and assign developmental priorities within a step-by-step upgrading process, toward the sustainable management and development of tourist destinations. © 2015 Taylor & Francis.

Perikos I.,Computer Technology Institute and Press | Perikos I.,University of Patras | Angelopoulos P.,Computer Technology Institute and Press | Angelopoulos P.,University of Patras | And 4 more authors.
Proceedings - 17th IEEE International Conference on Computational Science and Engineering, CSE 2014, Jointly with 13th IEEE International Conference on Ubiquitous Computing and Communications, IUCC 2014, 13th International Symposium on Pervasive Systems, Algorithms, and Networks, I-SPAN 2014 and 8th International Conference on Frontier of Computer Science and Technology, FCST 2014 | Year: 2015

This study presents the utilization of a Hybrid Education Platform for the realization of a versatile blended learning model oriented to computer engineering and science educators. Furthermore, a data mining approach is introduced to analyze the questionnaires that learners submit concerning the learning activities they have participated in. Specifically, a clustering and classification methodology framework is followed in order to efficiently examine and extract behavioral trends of the participants. Preliminary results indicate the robustness of the proposed methodology scheme which can potential be applied to various evaluation tasks. © 2014 IEEE.

Vikatos P.,University of Patras | Vikatos P.,Computer Technology Institute and Press | Theodoridis E.,University of Patras | Theodoridis E.,Computer Technology Institute and Press | And 4 more authors.
Proceedings - 2011 Panhellenic Conference on Informatics, PCI 2011 | Year: 2011

This work discusses PatrasSense, a system utilizing a range of technologies for monitoring environmental conditions, based on the concept of participatory monitoring. We discuss here the main issues in this category of applications, and its relation to the Real World Internet vision. We are interested in the use of sensors for collecting data related to the quality of life in urban areas, making it publicly available. We describe a possible architecture for such a system and a plan for deployment in the city of Patras, Greece. We have thus far implemented a set of features and conducted an initial set of small-scale experiments using sensor devices mounted on vehicles. We report on the respective results. © 2011 IEEE.

Antoniou A.,Computer Technology Institute and Press | Theodoridis E.,Computer Technology Institute and Press | Chatzigiannakis I.,Computer Technology Institute and Press | Mylonas G.,Computer Technology Institute and Press
Proceedings of IEEE Sensors | Year: 2011

In this work, we explore context-aware application scenarios that become possible utilizing semantically-rich information derived from real-world mobility and presence traces. Traces produced by people carrying personal mobile devices, capturing social and contextual interactions, serve as enables for Future Internet applications. We discuss the fundamental concepts, technical issues and related research challenges. We propose a reference architecture for setting up a system that collects such traces in a Smart City environment. We present the algorithms used to process the traces and infer interactions and interests for the observed populations. We conduct two 3-day trial deployments: one in an office environment and the other in the context of a Smart Conference application. We discuss our findings regarding the system's capability to track interactions and the overall efficacy of the application. © 2011 IEEE.

Michail O.,Computer Technology Institute and Press | Spirakis P.G.,University of Liverpool
Proceedings of the Annual ACM Symposium on Principles of Distributed Computing | Year: 2014

In this work, we study protocols so that populations of distributed processes can construct networks. In order to highlight the basic principles of distributed network construction we keep the model minimal in all respects. In particular, we assume finite-state processes that all begin from the same initial state and all execute the same protocol. Moreover, we assume pairwise interactions between the processes that are scheduled by a fair adversary. In order to allow processes to construct networks, we let them activate and deactivate their pairwise connections. When two processes interact, the protocol takes as input the states of the processes and the state of their connection and updates all of them. Initially all connections are inactive and the goal is for the processes, after interacting and activating/deactivating connections for a while, to end up with a desired stable network. We give protocols (optimal in some cases) and lower bounds for several basic network construction problems such as spanning line, spanning ring, spanning star, and regular network. The expected time to convergence of our protocols is analyzed under a uniform random, scheduler. Finally, we prove several universality results by presenting generic protocols that are capable of simulating a Turing Machine (TM) and exploiting it in order to construct a large class of networks. We additionally show how to partition the population into k supernodes, each being a line of log k nodes, for the largest such k. This amount of local memory is sufficient for the supernodes to obtain unique names and exploit their names and their memory to realize nontrivial constructions. Copyright is held by the owner/author(s). Publication rights licensed to ACM.

Paraskevas M.,Computer Technology Institute and Press | Stergatu H.,Computer Technology Institute and Press
Proceedings of the IADIS International Conference e-Learning 2012 | Year: 2012

In this paper, we present the Greek School Network (GSN) and describe the blogging and social networking service, which is designed to facilitate learning and collaboration. The paper focus on the challenges raised on installation, configuration and upgrading a private educational service social network application, using WordPress and BuddyPress and the solutions given for such a large-scale users group. Finally, we provide some statistical data that confirm the high use of this service. © 2012 IADIS.

Akribopoulos O.,Computer Technology Institute and Press | Logaras M.,Computer Technology Institute and Press | Mylonas G.,Computer Technology Institute and Press | Chatzigiannakis I.,Computer Technology Institute and Press | Mavrommati I.,Hellenic Open University
Proceedings - 9th International Conference on Intelligent Environments, IE 2013 | Year: 2013

A collection of pervasive street games is presented in this paper, that constitute a new social form of play taking place in public spaces, such as city parks, public spaces and streets. The main characteristic of these games is the ability to scale to a large number of players (in some cases involving more than 40 players) and can engage players located simultaneously in dispersed areas. Players interact with each other using a wide range of hardware devices that are either generic (such as smart phones) or specific (such as wireless sensor devices). We discuss a set of fundamental issues related to game design emphasizing on the one hand the interaction of the players with the ubiquitous computing environment and on the other hand the embedding of the game rules within the environment. The games are developed using open source technologies and evaluated in a series of events such as the Athens Plaython 2012 festival. The feedback received from the players indicates that this new form of gaming is indeed very promising. © 2013 IEEE.

Antoniou A.,Computer Technology Institute and Press | Theodoridis E.,Computer Technology Institute and Press | Chatzigiannakis I.,Computer Technology Institute and Press | Mylonas G.,Computer Technology Institute and Press
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

Recent activity in the field of Internet-of-Things experimentation has focused on the federation of discrete testbeds, thus placing less effort in the integration of other related technologies, such as smartphones; also, while it is gradually moving to more application-oriented paths, such as urban settings, it has not dealt in large with applications having social networking features. We argue here that current IoT infrastructure, testbeds and related software technologies should be used in such a context, capturing real-world human mobility and social networking interactions, for use in evaluating and fine-tuning realistic mobility models and designing human-centric applications. We discuss a system for producing traces for a new generation of human-centric applications, utilizing technologies such as Bluetooth and focusing on human interactions. We describe the architecture for this system and the respective implementation details presenting two distinct deployments; one in an office environment and another in an exhibition/conference event with 103 active participants combined, thus covering two popular scenarios for human centric applications. Our system provides online, almost real-time, feedback and statistics and its implementation allows for rapid and robust deployment, utilizing mainstream technologies and components. © 2012 Springer-Verlag Berlin Heidelberg.

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