8 Search Results for "Mascolo, Cecilia"

Document
DOI: 10.4230/DagMan.11.1.19
Conversational Agents: A Framework for Evaluation (CAFE) (Dagstuhl Perspectives Workshop 24352)

Authors: Christine Bauer, Li Chen, Nicola Ferro, Norbert Fuhr, Avishek Anand, Timo Breuer, Guglielmo Faggioli, Ophir Frieder, Hideo Joho, Jussi Karlgren, Johannes Kiesel, Bart P. Knijnenburg, Aldo Lipani, Lien Michiels, Andrea Papenmeier, Maria Soledad Pera, Mark Sanderson, Scott Sanner, Benno Stein, Johanne R. Trippas, Karin Verspoor, and Martijn C. Willemsen

Published in: Dagstuhl Manifestos, Volume 11, Issue 1 (2025)

Abstract
During the workshop, we deeply discussed what CONversational Information ACcess (CONIAC) is and its unique features, proposing a world model abstracting it, and defined the Conversational Agents Framework for Evaluation (CAFE) for the evaluation of CONIAC systems, consisting of six major components: 1) goals of the system’s stakeholders, 2) user tasks to be studied in the evaluation, 3) aspects of the users carrying out the tasks, 4) evaluation criteria to be considered, 5) evaluation methodology to be applied, and 6) measures for the quantitative criteria chosen.
Cite as

Christine Bauer, Li Chen, Nicola Ferro, Norbert Fuhr, Avishek Anand, Timo Breuer, Guglielmo Faggioli, Ophir Frieder, Hideo Joho, Jussi Karlgren, Johannes Kiesel, Bart P. Knijnenburg, Aldo Lipani, Lien Michiels, Andrea Papenmeier, Maria Soledad Pera, Mark Sanderson, Scott Sanner, Benno Stein, Johanne R. Trippas, Karin Verspoor, and Martijn C. Willemsen. Conversational Agents: A Framework for Evaluation (CAFE) (Dagstuhl Perspectives Workshop 24352). In Dagstuhl Manifestos, Volume 11, Issue 1, pp. 19-67, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2025)

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@Article{bauer_et_al:DagMan.11.1.19,
  author =	{Bauer, Christine and Chen, Li and Ferro, Nicola and Fuhr, Norbert and Anand, Avishek and Breuer, Timo and Faggioli, Guglielmo and Frieder, Ophir and Joho, Hideo and Karlgren, Jussi and Kiesel, Johannes and Knijnenburg, Bart P. and Lipani, Aldo and Michiels, Lien and Papenmeier, Andrea and Pera, Maria Soledad and Sanderson, Mark and Sanner, Scott and Stein, Benno and Trippas, Johanne R. and Verspoor, Karin and Willemsen, Martijn C.},
  title =	{{Conversational Agents: A Framework for Evaluation (CAFE) (Dagstuhl Perspectives Workshop 24352)}},
  pages =	{19--67},
  journal =	{Dagstuhl Manifestos},
  ISSN =	{2193-2433},
  year =	{2025},
  volume =	{11},
  number =	{1},
  editor =	{Bauer, Christine and Chen, Li and Ferro, Nicola and Fuhr, Norbert and Anand, Avishek and Breuer, Timo and Faggioli, Guglielmo and Frieder, Ophir and Joho, Hideo and Karlgren, Jussi and Kiesel, Johannes and Knijnenburg, Bart P. and Lipani, Aldo and Michiels, Lien and Papenmeier, Andrea and Pera, Maria Soledad and Sanderson, Mark and Sanner, Scott and Stein, Benno and Trippas, Johanne R. and Verspoor, Karin and Willemsen, Martijn C.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagMan.11.1.19},
  URN =		{urn:nbn:de:0030-drops-252722},
  doi =		{10.4230/DagMan.11.1.19},
  annote =	{Keywords: Conversational Agents, Evaluation, Information Access}
}
Document
DOI: 10.4230/LIPIcs.TIME.2025.8
Heuristics for Covering the Timeline in Temporal Graphs

Authors: Riccardo Dondi, Rares-Ioan Mateiu, and Alexandru Popa

Published in: LIPIcs, Volume 355, 32nd International Symposium on Temporal Representation and Reasoning (TIME 2025)

Abstract
We consider a variant of the Vertex Cover problem on temporal graphs, called Minimum Timeline Cover (k-MinTimelineCover). Temporal graphs are used to model complex systems, describing how edges (relations) change in a discrete time domain. The k-MinTimelineCover problem has been introduced in complex data summarization and synthesis jobs. Given a temporal graph G, k-MinTimelineCover asks to define k activity intervals for each vertex, such that each temporal edge is covered by at least one active interval. The objective function is the minimization of the sum of interval lengths. k-MinTimelineCover is NP-hard and even hard to approximate within any factor for k > 1. While the literature has mainly focused on the cases k = 1, in this contribution we consider the case k > 1. We first present an ILP formulation that is able to solve the problem on moderate size instances. Then we develop an efficient heuristic, based on local search which is built on top of the solution of an existing literature method. Finally, we present an experimental evaluation of our algorithms on synthetic data sets, that shows in particular that our heuristic has a consistent improvement on the state-of-the art method.
Cite as

Riccardo Dondi, Rares-Ioan Mateiu, and Alexandru Popa. Heuristics for Covering the Timeline in Temporal Graphs. In 32nd International Symposium on Temporal Representation and Reasoning (TIME 2025). Leibniz International Proceedings in Informatics (LIPIcs), Volume 355, pp. 8:1-8:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2025)

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@InProceedings{dondi_et_al:LIPIcs.TIME.2025.8,
  author =	{Dondi, Riccardo and Mateiu, Rares-Ioan and Popa, Alexandru},
  title =	{{Heuristics for Covering the Timeline in Temporal Graphs}},
  booktitle =	{32nd International Symposium on Temporal Representation and Reasoning (TIME 2025)},
  pages =	{8:1--8:13},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-401-7},
  ISSN =	{1868-8969},
  year =	{2025},
  volume =	{355},
  editor =	{Vidal, Thierry and Wa{\l}\k{e}ga, Przemys{\l}aw Andrzej},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TIME.2025.8},
  URN =		{urn:nbn:de:0030-drops-244542},
  doi =		{10.4230/LIPIcs.TIME.2025.8},
  annote =	{Keywords: Temporal Networks, Activity Timeline, Vertex Cover, Heuristic, Dynamic Programming}
}
Document
DOI: 10.4230/DagRep.1.11.39
Analysis of Dynamic Social and Technological Networks (Dagstuhl Seminar 11452)

Authors: Vito Latora, Cecilia Mascolo, and Mirco Musolesi

Published in: Dagstuhl Reports, Volume 1, Issue 11 (2012)

Abstract
With the growing popularity of online communication tools, researchers have turned their attention to the study of the networks arising between users of social networking services, between mobile phone callers and, in general, between individuals connected by technological means. Thanks to the rich set of techniques and methods developed by complex network science, and joining forces with sociologists and psychologists, the analysis of dynamic social and technological networks has sparked many important results, attracting even more interest as the importance of such systems grows over time. This Dagstuhl seminar brought together researchers and practitioners from computer science, physics and psychology, covering the diverse areas of social and technological network analysis. The goal of the seminar was to bring together people from different areas of expertise, focusing on both mathematical aspects and practical applications of theoretical models and techniques. In particular, the evolution of this research field and of its future perspectives was a major theme of the seminar. This seminar was attended by 25 participants.
Cite as

Vito Latora, Cecilia Mascolo, and Mirco Musolesi. Analysis of Dynamic Social and Technological Networks (Dagstuhl Seminar 11452). In Dagstuhl Reports, Volume 1, Issue 11, pp. 39-49, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@Article{latora_et_al:DagRep.1.11.39,
  author =	{Latora, Vito and Mascolo, Cecilia and Musolesi, Mirco},
  title =	{{Analysis of Dynamic Social and Technological Networks (Dagstuhl Seminar 11452)}},
  pages =	{39--49},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2012},
  volume =	{1},
  number =	{11},
  editor =	{Latora, Vito and Mascolo, Cecilia and Musolesi, Mirco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.1.11.39},
  URN =		{urn:nbn:de:0030-drops-33744},
  doi =		{10.4230/DagRep.1.11.39},
  annote =	{Keywords: complex networks, network analysis, network data mining}
}
Document
DOI: 10.4230/DagSemProc.10403.1
10403 Abstracts Collection – Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation

Authors: Kevin C. Almeroth, Gunnar Karlsson, Cecilia Mascolo, and Jörg Ott

Published in: Dagstuhl Seminar Proceedings, Volume 10403, Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation (2011)

Abstract
From 06.10.2010 to 09.10.2010, the Dagstuhl Seminar 10403 ``Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation'' was held in Schloss Dagstuhl~--~Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.
Cite as

Kevin C. Almeroth, Gunnar Karlsson, Cecilia Mascolo, and Jörg Ott. 10403 Abstracts Collection – Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation. In Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation. Dagstuhl Seminar Proceedings, Volume 10403, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2011)

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@InProceedings{almeroth_et_al:DagSemProc.10403.1,
  author =	{Almeroth, Kevin C. and Karlsson, Gunnar and Mascolo, Cecilia and Ott, J\"{o}rg},
  title =	{{10403 Abstracts Collection – Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation}},
  booktitle =	{Impact of Human Mobility on Communications : Measurement, Analysis, Modeling, and Simulation},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2011},
  volume =	{10403},
  editor =	{Kevin C. Almeroth and Gunnar Karlsson and Cecilia Mascolo and J\"{o}rg Otto},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10403.1},
  URN =		{urn:nbn:de:0030-drops-29222},
  doi =		{10.4230/DagSemProc.10403.1},
  annote =	{Keywords: Human Mobility, Vehicular Mobility, Social Interactions, Mobile Networking}
}
Document
DOI: 10.4230/DagSemProc.09071.1
09071 Abstracts Collection – Delay and Disruption-Tolerant Networking (DTN) II

Authors: Kevin Fall, Cecilia Mascolo, Jörg Ott, and Lars Wolf

Published in: Dagstuhl Seminar Proceedings, Volume 9071, Delay and Disruption-Tolerant Networking (DTN) II (2009)

Abstract
From 08.02. to 11.02.2009, the Dagstuhl Seminar 09071 ``Delay and Disruption-Tolerant Networking (DTN) II '' was held in Schloss Dagstuhl~--~Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.
Cite as

Kevin Fall, Cecilia Mascolo, Jörg Ott, and Lars Wolf. 09071 Abstracts Collection – Delay and Disruption-Tolerant Networking (DTN) II. In Delay and Disruption-Tolerant Networking (DTN) II. Dagstuhl Seminar Proceedings, Volume 9071, pp. 1-8, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{fall_et_al:DagSemProc.09071.1,
  author =	{Fall, Kevin and Mascolo, Cecilia and Ott, J\"{o}rg and Wolf, Lars},
  title =	{{09071 Abstracts Collection – Delay and Disruption-Tolerant Networking (DTN) II}},
  booktitle =	{Delay and Disruption-Tolerant Networking (DTN) II},
  pages =	{1--8},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9071},
  editor =	{Kevin Fall and Cecilia Mascolo and J\"{o}rg Ott and Lars Wolf},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09071.1},
  URN =		{urn:nbn:de:0030-drops-23603},
  doi =		{10.4230/DagSemProc.09071.1},
  annote =	{Keywords: DTN, simulations, mobility, MANET, delay-tolerant networking, ad-hoc networking, routing}
}
Document
DOI: 10.4230/DagSemProc.09071.2
09071 Executive Summary – Delay and Disruption-Tolerant Networking (DTN) II

Authors: Kevin Fall, Cecilia Mascolo, Jörg Ott, and Lars Wolf

Published in: Dagstuhl Seminar Proceedings, Volume 9071, Delay and Disruption-Tolerant Networking (DTN) II (2009)

Abstract
Today's Internet architecture and protocols, while perfectly suitable for well- connected users, may easily experience serious performance degradation and entirely stop working in more challenged networking environments. These correspondong scenarios all share two commonalities: that an end-to-end path between two communicating nodes may not exist at any single point in time and that communication delay may be significant. With the continued expansion of the Internet into new areas, these environments become commonplace and are no longer restricted to exotic sensing applications but are quickly becoming relevant to consumers in everyday life. Many attempts over recent years of incrementally fixing the Internet protocols in a bottom up fashion have only achieved partial successes, and a more fundamental approach is needed to address networking environments in which delays and disconnections may last for significant periods of time, and are the rule rather than the exception. Delay-tolerant Networking (DTN) has taken a more encompassing approach to dealing with virtually all types of connectivity challenges, from bit rate to errors to delays to disruptions. By providing a novel communication abstraction that relies exclusively on asynchronous hop-by-hop message passing with no need for instant end-to-end connectivity, DTN concepts enable communications even under adverse conditions. This comes, however, at the cost of interactivity of communications, rendering any kind state synchronization or validation more difficult and raising new challenges. These include routing protocols – that need to operate under often unknown future conditions, security mechanisms – that can no longer carry out instant key derivation or validation even if a security infrastructure was in place, and applica- tion protocols and paradigms – that can no longer rely on simple lower layer abstrac- tions promising (mostly) instant and reliable interactions.
Cite as

Kevin Fall, Cecilia Mascolo, Jörg Ott, and Lars Wolf. 09071 Executive Summary – Delay and Disruption-Tolerant Networking (DTN) II. In Delay and Disruption-Tolerant Networking (DTN) II. Dagstuhl Seminar Proceedings, Volume 9071, pp. 1-5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{fall_et_al:DagSemProc.09071.2,
  author =	{Fall, Kevin and Mascolo, Cecilia and Ott, J\"{o}rg and Wolf, Lars},
  title =	{{09071 Executive Summary – Delay and Disruption-Tolerant Networking (DTN) II}},
  booktitle =	{Delay and Disruption-Tolerant Networking (DTN) II},
  pages =	{1--5},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9071},
  editor =	{Kevin Fall and Cecilia Mascolo and J\"{o}rg Ott and Lars Wolf},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09071.2},
  URN =		{urn:nbn:de:0030-drops-23574},
  doi =		{10.4230/DagSemProc.09071.2},
  annote =	{Keywords: DTN, simulations, mobility, MANET, delay-tolerant networking, ad-hoc networking, routing}
}
Document
DOI: 10.4230/DagSemProc.09071.3
On the Performance of Pedestrian Content Distribution

Authors: Gunnar Karlsson, Olafur Ragnar Helgason, and Vladimir Vukadinovic

Published in: Dagstuhl Seminar Proceedings, Volume 9071, Delay and Disruption-Tolerant Networking (DTN) II (2009)

Abstract
Mobile communication devices may be used for spreading multimedia data without support of an infrastructure. Such a scheme, where the data is carried by people walking around and relayed from device to device by means of short range radio, could potentially form a public content distribution system that spans vast urban areas. There are basically only three system parameters that can be determined in the design: the transmission range of the nodes, the setup time when nodes make a contact, and their storage capacity. The transport mechanism is the flow of people and it can be studied but not engineered. The question addressed in this paper is how well pedestrian content distribution may work. We answer this question by modeling the mobility of people moving around in a city, constrained by a given topology. The model is supplemented by simulation of similar or related scenarios for validation and extension. Our conclusion is that contents spread well with pedestrian speeds already at low arrival rates into a studied region. Our contributions are both the results on the feasibility of pedestrian content distribution and the queuing analytic model that captures the flow of people.
Cite as

Gunnar Karlsson, Olafur Ragnar Helgason, and Vladimir Vukadinovic. On the Performance of Pedestrian Content Distribution. In Delay and Disruption-Tolerant Networking (DTN) II. Dagstuhl Seminar Proceedings, Volume 9071, pp. 1-23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{karlsson_et_al:DagSemProc.09071.3,
  author =	{Karlsson, Gunnar and Helgason, Olafur Ragnar and Vukadinovic, Vladimir},
  title =	{{On the Performance of Pedestrian Content Distribution}},
  booktitle =	{Delay and Disruption-Tolerant Networking (DTN) II},
  pages =	{1--23},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9071},
  editor =	{Kevin Fall and Cecilia Mascolo and J\"{o}rg Ott and Lars Wolf},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09071.3},
  URN =		{urn:nbn:de:0030-drops-23597},
  doi =		{10.4230/DagSemProc.09071.3},
  annote =	{Keywords: Content distribution, mobile peer-to-peer, ad hoc network, wireless network, mobile communication}
}
Document
DOI: 10.4230/DagSemProc.09071.4
Wireless Epidemic Spread in Dynamic Human Networks

Authors: Eiko Yoneki, Pan Hui, and Jon Crowcroft

Published in: Dagstuhl Seminar Proceedings, Volume 9071, Delay and Disruption-Tolerant Networking (DTN) II (2009)

Abstract
The emergence of Delay Tolerant Networks (DTNs) has culminated in a new generation of wireless networking. New communication paradigms, which use dynamic interconnectedness as people encounter each other opportunistically, lead towards a world where digital traffic flows more easily. We focus on humanto- human communication in environments that exhibit the characteristics of social networks. This paper describes our study of information flow during epidemic spread in such dynamic human networks, a topic which shares many issues with network-based epidemiology. We explore hub nodes extracted from real world connectivity traces and show their influence on the epidemic to demonstrate the characteristics of information propagation.
Cite as

Eiko Yoneki, Pan Hui, and Jon Crowcroft. Wireless Epidemic Spread in Dynamic Human Networks. In Delay and Disruption-Tolerant Networking (DTN) II. Dagstuhl Seminar Proceedings, Volume 9071, pp. 1-16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{yoneki_et_al:DagSemProc.09071.4,
  author =	{Yoneki, Eiko and Hui, Pan and Crowcroft, Jon},
  title =	{{Wireless Epidemic Spread in Dynamic Human Networks}},
  booktitle =	{Delay and Disruption-Tolerant Networking (DTN) II},
  pages =	{1--16},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9071},
  editor =	{Kevin Fall and Cecilia Mascolo and J\"{o}rg Ott and Lars Wolf},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09071.4},
  URN =		{urn:nbn:de:0030-drops-23585},
  doi =		{10.4230/DagSemProc.09071.4},
  annote =	{Keywords: Time Dependent Networks, Connectivity Modelling and Analysis, Network Measurement, Delay Tolerant Networks, Social Networks}
}
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