@booklet {57, title = {Energy Sustainability in Cooperating Clouds}, journal = {CLOSER 2013 - 3rd International Conference on Cloud Computing and Services Science}, year = {2013}, month = {10 May}, pages = {83{\textendash}89}, publisher = {SCITEPRESS}, address = {Setubal}, author = {Celesti A. and Puliafito A. and Tusa F. and Villari M.} } @proceedings {256, title = {Evaluating wireless sensor node longevity through Markovian techniques}, journal = {COMPUTER NETWORKS}, volume = {56}, year = {2012}, pages = {521{\textendash}532}, abstract = {

Wireless sensor networks are constituted of a large number of tiny sensor nodes randomly distributed over a geographical region. In order to reduce power consumption, nodes undergo active-sleep periods that, on the other hand, limit their ability to send/receive data. The aim of this paper is to analyze the longevity of a battery-powered sensor node. A battery discharge model able to capture both linear and non linear discharge processes is presented. Then, two different models are proposed to investigate the longevity, in terms of reliability, of sensor nodes with active-sleep cycles. The first model, well known in the literature, is based on the Markov reward theory and on the evaluation of the accumulated reward distribution. The second model, based on continuous phase type distributions and Kronecker algebra, represents the main contribution of the present work, since it allows to relax some assumptions of the Markov reward model, thus increasing its applicability to more concrete use cases. In the final part of the paper, the results obtained by applying the two techniques to a case study are compared in order to validate and highlight the benefits of our approach and demonstrate the utility of the proposed model in a quite complex and real scenario.

}, keywords = {Battery discharge process, Continuous phase type distributions, Energy consumption, Kronecker algebra, Markov reward models, Reliability}, doi = {10.1016/j.comnet.2011.10.003}, author = {Bruneo D. and Distefano S. and Longo F. and Puliafito A. and Scarpa M.} } @booklet {58, title = {How The Dataweb Can Support Cloud Federation: Service Representation And Secure Data Exchange}, journal = {Proceedings of The Second IEEE Symposium on Network Cloud Computing and Applications (NCCA {\textquoteright}12)}, year = {2012}, month = {5 Dicembre}, pages = {73{\textendash}79}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA}, doi = {10.1109/NCCA.2012.26}, author = {Celesti A. and Tusa F. and Villari M. and Puliafito A.} } @proceedings {255, title = {Software Rejuvenation in the Cloud}, journal = {Proceedings of the 5th International ICST Conference on Simulation Tools and Techniques (SIMUTOOLS 12)}, year = {2012}, month = {23 marzo 2012}, pages = {8{\textendash}16}, publisher = {ICST}, abstract = {

In this paper, we investigate how software rejuvenation can be used in a Cloud environment to increase the availability of a virtualized system composed of a single virtual machine monitor (VMM) on top of which a certain number of virtual machines (VMs) can be instantiated. We start from the assumption that the aging of a VMM increases with the number of VMs it is managing, thus characterizing the problem in terms of dynamic reliability. Therefore, by identifying the age of the VMM with its reliability and based on the conservation of reliability principle, we characterize the time to failure of the VMM through continuous phase type distributions. The system availability is thus modeled by an expanded continuous time Markov chain expressed in terms of Kronecker algebra in order to face the state space explosion and to keep memory of the age reached by the VMM in case the number of the hosted VMs change. Time-based rejuvenation is taken into consideration and the optimal timer is evaluated in order to maximize the VMM availability.

}, keywords = {cloud computing, Dynamic Availability, Phase Type Distributions., Rejuvenation, Virtualized Environments}, author = {Bruneo D. and Longo F. and Puliafito A. and Scarpa M. and Distefano S.} } @proceedings {257, title = {Monitoring Energy Consumption in an Industrial Site}, journal = {Advances in Computer, Communication, Control and Automation}, volume = {121}, year = {2011}, month = {20, 2011}, pages = {53{\textendash}60}, publisher = {Springer}, address = {Heidelberg}, abstract = {

The Smart Grid vision imposes a new approach towards energy supply that is more affordable, reliable and sustainable. The core of this new vision is the use of advanced technology to monitor power system dynamics in real time and identify system in stability. In this pa-per we present a real time analysis tool specifically designed to monitor an industrial site with particular attention to power consumption. This solution, based on Wireless Sensor Networks, is able to produce useful results and to provide statistic analysis useful for the future choices of the industrial company.

}, keywords = {middleware., routing protocols, sensor networks}, author = {Bruneo D. and Cucinotta A. and Longo Minnolo A. and Puliafito A. and Scarpa A.} } @booklet {305, title = {Design and Implementation of a Performance Plug-in for the ArgoUML Tool}, journal = {IASTED Conf. on Software Engineering}, year = {2005}, month = {17 Febbraio}, pages = {337{\textendash}342}, publisher = {ACTA Press}, address = {Calgary}, author = {S. Distefano and D. PACI and Marco Scarpa and Puliafito A.} } @booklet {310, title = {From Client/Server to Mobile Agents: An in-depth Analysis of the Related Performance Aspects}, journal = {ISCC 2002: SEVENTH INTERNATIONAL SYMPOSIUM ON COMPUTERS AND COMMUNICATIONS, PROCEEDINGS}, year = {2002}, month = {4 Luglio 2002}, pages = {768{\textendash}773}, publisher = {IEEE}, address = {New York}, abstract = {This paper provides an experimental and analytical evaluation of the Client-Server, Remote Evaluation and Mobile Agent communication paradigms. Our purpose is that of identifying the environmental situations in which such paradigms should be preferred or combined in order to optimize the performances of a distributed system. The scenario selected for the analysis is the Information Retrieval on the WWW. An analytical evaluation throughout the solution of non-Markovian Petri net models is provided.}, keywords = {REMOTE EVALUATION}, doi = {10.1109/ISCC.2002.1021760}, author = {Marco Scarpa and M. Villari and A. Zaia and Puliafito A.} } @booklet {311, title = {Which paradigm should I use? An analytical comparison of the client-server, remote evaluation and mobile agent paradigms}, journal = {CONCURRENCY AND COMPUTATION}, volume = {13}, year = {2001}, pages = {71{\textendash}94}, author = {Puliafito A. and RICCOBENE S and Scarpa M} } @booklet {312, title = {Design and Evaluation of Replicated Databases for Mobile Systems}, journal = {WIRELESS NETWORKS}, volume = {6}, year = {2000}, pages = {131{\textendash}144}, author = {S. PALAZZO and Puliafito A. and Marco Scarpa} } @booklet {254, title = {Evaluation of Performability Parameters in Client-Server Environments}, journal = {THE COMPUTER JOURNAL}, volume = {39}, year = {1996}, pages = {0{\textendash}0}, author = {Puliafito A. and Riccobene S. and Scarpa M.} }