@conference{11568_465482,

title = {Adaptive fuzzy-valued service selection},

author = {Bacciu Davide and Buscemi Maria Grazia and Mkrtchyan Lusine },

doi = {10.1145/1774088.1774598},

year  = {2010},

date = {2010-01-01},

booktitle = {Proceedings of the 2010 ACM Symposium on Applied Computing - SAC '10},

journal = {PROCEEDINGS OF THE .. ACM SYMPOSIUM ON APPLIED COMPUTING},

pages = {2467--2471},

abstract = {Service composition concerns both integration of heterogeneous distributed applications and dynamic selection of services. QoS-aware selection enables a service requester with certain QoS requirements to classify services according to their QoS guarantees. In this paper we present a method that allows for a fuzzy-valued description of QoS parameters. Fuzzy sets are suited to specify both the QoS preferences raised by a service requester such as 'response time must be as lower as possible and cannot be more that 1000ms' and approximate estimates a provider can make on the QoS capabilities of its services like 'availability is roughly between 95% and 99%'. We propose a matchmaking procedure based on a fuzzy-valued similarity measure that, given the specifications of QoS parameters of the requester and the providers, selects the most appropriate service among several functionally-equivalent ones. We also devise a method for dynamical update of service offers by means of runtime monitoring of the actual QoS performance.},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{11568_466669,

title = {Fuzzy Admission Control with Similarity Evaluation for VoWLAN with QoS Support},

author = {Bacciu Davide and Botta Alessio and Badia Leonardo },

doi = {10.1109/WONS.2008.4459355},

year  = {2008},

date = {2008-01-01},

booktitle = {2008 Fifth Annual Conference on Wireless on Demand Network Systems and Services},

pages = {57--64},

publisher = {IEEE},

abstract = {In this paper, we make use of a fuzzy approach to determine a soft Admission Control mechanism for Voice-over-Internet-Protocol services over Wireless Local Area Network. In such a system, complicated interactions between service provider and clients take place, since the network capacity constraints must be matched with users' preferences and needs. Most of the difficulties in dealing with these interactions stem from the fact that it is very difficult to define both the load condition of the network and the users' requirements in a crisp manner. To this end, we define a framework in which the provider expresses the network status and the clients describe their preferences by means of an approach based on Fuzzy Set Theory. In this way, we are able to develop an Admission Control strategy, based on Similarity Evaluation techniques, that enforces the soft constraints expressed by the two parties. The obtained framework is numerically evaluated, showing the benefit of employing Fuzzy Set Theory with respect to the traditional crisp approach.},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{11568_466672,

title = {A framework for semantic querying of distributed data-graphs via information granules},

author = {BACCIU Davide and BOTTA Alessio and STEFANESCU Dan},

url = {https://pages.di.unipi.it/bacciu/wp-content/uploads/sites/12/2016/04/bbs_ISC07.pdf

http://dl.acm.org/citation.cfm?id=1647449.1647477},

year  = {2007},

date = {2007-01-01},

booktitle = {Proceedings of the 10th IASTED International Conference on Intelligent Systems and Control},

pages = {161--166},

publisher = {ACTA PRESS},

address = {Anaheim, CA, USA},

abstract = {Regular path queries (RPQ) represent a common and convenient way to access and extract knowledge represented as labeled and weighted data-graphs. In this paper, we look to enhance the information representation in data-graphs and RPQs by augmenting their expressive power with the use of semantically meaningful knowledge in the form of information granules. We extended a recent distributed algorithm for the evaluation of RPQs on spatial networks by introducing fuzzy weights in place of crisp values both in the data-graphs and the query formulation. Moreover, we describe two alternative strategies for determining the costs of the paths computed by the fuzzy RPQ evaluation process. A spatial network case-study is used to illustrate the soundness of the approach.},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{11568_466674,

title = {A Fuzzy Approach for Negotiating Quality of Services},

author = {Bacciu Davide and Botta Alessio and Melgratti Hernan },

doi = {10.1007/978-3-540-75336-0_13},

year  = {2007},

date = {2007-01-01},

booktitle = {TRUSTWORTHY GLOBAL COMPUTING, Lecture Notes in Computer Science},

journal = {LECTURE NOTES IN COMPUTER SCIENCE},

volume = {4661},

pages = {200--217},

publisher = {Springer Verlag},

abstract = {A central point when integrating services concerns to the description, agreement and enforcement of the quality aspect of service interaction, usually known as Service Level Agreement (SLA). This paper presents a framework for SLA negotiation based on fuzzy sets. We propose (i) a request language for clients to describe quality preferences, (ii) a publication language for providers to define the qualities of their offered services, and (iii) a decision procedure for granting any client request with a SLA contract fitting the requestor requirements. We start with a restricted framework in which the different qualities of a service are handled independently (as being orthogonal) and then we propose an extension that allows clients and providers to express dependencies among different qualities.},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{11568_466673,

title = {Augmenting the Distributed Evaluation of Path Queries via Information Granules},

author = {BACCIU Davide and BOTTA Alessio and STEFANESCU Dan},

url = {http://mlg07.dsi.unifi.it/pdf/16_Botta.pdf},

year  = {2007},

date = {2007-01-01},

booktitle = {Proceedings of the 5th International Workshop on Mining and Learning with Graphs (MLG'07)},

pages = {105--109},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{11568_466675,

title = {Fuzzy Agreement for Network Service Contracts},

author = {BACCIU Davide and BADIA Leonardo and BOTTA Alessio},

year  = {2007},

date = {2007-01-01},

booktitle = {Proceedings of the 6th International Conference on Computational Intelligence in Economics & Finance (CIEF 2007)},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}