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179 results on '"Sebé, Francesc"'

1. Measuring privacy in smart metering anonymized data

Author

Martínez, Santi, Sebé, Francesc, and Sorge, Christoph

Subjects
Computer Science - Cryptography and Security
Abstract

In recent years, many proposals have arisen from research on privacy in smart metering. In one of the considered approaches, referred to as anonymization, smart meters transmit fine-grained electricity consumption values in such a way that the energy supplier can not exactly determine procedence. This paper measures the real privacy provided by such approach by taking into account that at the end of a billing period the energy supplier collects the overall electricity consumption of each meter for billing purposes. An entropy-based measure is proposed for quantifying privacy and determine the extent to which knowledge on the overall consumption of meters allows to re-identify anonymous fine-grained consumption values.

Published
2020

7. Endorsement Deduction and Ranking in Social Networks

Author

Pérez-Rosés, Hebert, Sebé, Francesc, and Ribó, Josep Maria

Subjects
Computer Science - Social and Information Networks, H.3.3, H.3.4
Abstract

Some social networks, such as LinkedIn and ResearchGate, allow user endorsements for specific skills. In this way, for each skill we get a directed graph where the nodes correspond to users' profiles and the arcs represent endorsement relations. From the number and quality of the endorsements received, an authority score can be assigned to each profile. In this paper we propose an authority score computation method that takes into account the relations existing among different skills. Our method is based on enriching the information contained in the digraph of endorsements corresponding to a specific skill, and then applying a ranking method admitting weighted digraphs, such as PageRank. We describe the method, and test it on a synthetic network of 1493 nodes, fitted with endorsements., Comment: 32 pages

Published
2015
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8. Synthetic Generation of Social Network Data With Endorsements

Author

Pérez-Rosés, Hebert and Sebé, Francesc

Subjects
Computer Science - Social and Information Networks, Physics - Physics and Society, 68U20, 65C10, 90C27, 90C59, I.6.8, I.2.8, G.3
Abstract

In many simulation studies involving networks there is the need to rely on a sample network to perform the simulation experiments. In many cases, real network data is not available due to privacy concerns. In that case we can recourse to synthetic data sets with similar properties to the real data. In this paper we discuss the problem of generating synthetic data sets for a certain kind of online social network, for simulation purposes. Some popular online social networks, such as LinkedIn and ResearchGate, allow user endorsements for specific skills. For each particular skill, the endorsements give rise to a directed subgraph of the corresponding network, where the nodes correspond to network members or users, and the arcs represent endorsement relations. Modelling these endorsement digraphs can be done by formulating an optimization problem, which is amenable to different heuristics. Our construction method consists of two stages: The first one simulates the growth of the network, and the second one solves the aforementioned optimization problem to construct the endorsements., Comment: 5 figures, 2 algorithms, Journal of Simulation 2015

Published
2014

9. Mobile terrestrial laser scanner vs. UAV photogrammetry to estimate woody crop canopy parameters – Part 2: Comparison for different crops and training systems

Author

Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Torres-Sánchez, Jorge [0000-0003-1420-0145], Escolà, Alexandre [0000-0002-9775-5471], Castro, Ana Isabel de [0000-0002-6699-2204], López Granados, Francisca [0000-0001-9165-7558], Rosell-Polo, Joan R. [0000-0001-6746-2830], Sebé, Francesc [0000-0002-7217-5227], Jiménez-Brenes, Francisco Manuel [0000-0002-9062-4911], Sanz, Ricardo [0000-0002-2381-933X], Gregorio, Eduard [0000-0003-0553-1006], Peña Barragán, José Manuel [0000-0003-4592-3792], Torres-Sánchez, Jorge, Escolà, Alexandre, Castro, Ana Isabel de, López Granados, Francisca, Rosell-Polo, Joan R., Sebé, Francesc, Jiménez-Brenes, Francisco Manuel, Sanz, Ricardo, Gregorio, Eduard, Peña Barragán, José Manuel, Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Torres-Sánchez, Jorge [0000-0003-1420-0145], Escolà, Alexandre [0000-0002-9775-5471], Castro, Ana Isabel de [0000-0002-6699-2204], López Granados, Francisca [0000-0001-9165-7558], Rosell-Polo, Joan R. [0000-0001-6746-2830], Sebé, Francesc [0000-0002-7217-5227], Jiménez-Brenes, Francisco Manuel [0000-0002-9062-4911], Sanz, Ricardo [0000-0002-2381-933X], Gregorio, Eduard [0000-0003-0553-1006], Peña Barragán, José Manuel [0000-0003-4592-3792], Torres-Sánchez, Jorge, Escolà, Alexandre, Castro, Ana Isabel de, López Granados, Francisca, Rosell-Polo, Joan R., Sebé, Francesc, Jiménez-Brenes, Francisco Manuel, Sanz, Ricardo, Gregorio, Eduard, and Peña Barragán, José Manuel

Abstract

The measurement of geometric canopy parameters in woody crops is an important task in Precision Agriculture because of their correlation with crop condition and productivity. In recent years, several technological approaches have been developed as an alternative to manual measurements, which are time- and labour-consuming. Two of the most commonly used 3D canopy characterization technologies are mobile terrestrial laser scanning (MTLS) based on light detection and ranging (LiDAR) sensors, and digital aerial photogrammetry (DAP) using imagery from uncrewed aerial vehicles (UAVs). Although both are state-of-the-art and have been fully tested and validated, a complete comparison between their geometric canopy parameter estimations in different woody crops and training systems has not been carried out. For this reason, a set of geometric parameters (canopy height, projected area, and volume) of a vineyard, an intensive peach orchard, and an intensive pear orchard were measured using UAV-DAP and MTLS-LiDAR. A comparison between both kinds of measurements was performed, accounting for the length of the sections in which the crop hedgerows were divided to extract the geometric parameters. Measurements from the UAV and the MTLS were highly correlated (R2 from 0.82 to 0.94) when considering the data from the three crops together, and the correlations were higher when analysing longer row sections. The canopy geometric parameters estimated using the MTLS-LiDAR always had higher values than those from the UAV-DAP. The results presented in this work provide useful data for a more informed selection of technological approaches for 3D crop characterization in Precision Fruticulture and high-throughput phenotyping.

Published
2023

10. An e-Coin Based Construction for Unlinkable Priced Oblivious Transfer.

Author

Borges, Ricard and Sebé, Francesc

Abstract

A '1-out-of-n' oblivious transfer (OT) protocol involves two participants: a sender, who provides a set of items as input, and a receiver. The protocol guarantees that the receiver gets exactly one of the items of the input set, while the sender is unable to determine which. Priced OT (POT) protocols further allow each item of the input set to be assigned a price in such a way that, after a proper execution of the protocol, the receiver gets the requested item if and only if the corresponding sum of money has been paid. In this paper, we present a construction which takes a '1-out-of-n' OT protocol and transform it into a POT one. Moreover, the resulting system is unlinkable in the sense that the sender is unable to determine whether two executions of the protocol were run by the same receiver or not. When compared to existing unlinkable POT protocols, our construction offers a lower conceptual complexity as it does not involve the use of zero-knowledge proofs. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Privacy-Preserving Electricity Trading for Connected Microgrids.

Author

Alàs, Oriol and Sebé, Francesc

Subjects
ELECTRICITY markets, ELECTRICITY, ENERGY consumption, SYSTEMS design, MICROGRIDS, ENVIRONMENTAL impact analysis
Abstract

The electricity market is evolving from the traditional unidirectional model into a bidirectional one in which households also generate and sell energy. This new scenario requires technology able to manage the available energy and guarantee that all the participants pay or are paid appropriately. Unfortunately, fine-grained monitoring of energy production and consumption makes it possible to infer sensitive information about confidential aspects of people's private life. In this paper, we propose a system designed for privacy-preserving electricity trading in a connected microgrid. The system guarantees that at the end of a billing period, the distribution system operator can compute the quantity to be charged or paid to each household while being unable to trace its consumption details. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Mobile terrestrial laser scanner vs. UAV photogrammetry to estimate woody crop canopy parameters – Part 1: Methodology and comparison in vineyards

Author

Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Peña Barragán, José Manuel [0000-0003-4592-3792], López Granados, Francisca [0000-0001-9165-7558], Castro, Ana Isabel de [0000-0002-6699-2204], Jiménez-Brenes, Francisco Manuel [000-0002-9062-4911], Torres-Sánchez, Jorge [0000-0003-1420-0145], Escolà, Alexandre, Peña Barragán, José Manuel, López Granados, Francisca, Rosell-Polo, Joan R., Castro, Ana Isabel de, Gregorio, Eduard, Jiménez-Brenes, Francisco Manuel, Sanz, Ricardo, Sebé, Francesc, Llorens, Jordi, Torres-Sánchez, Jorge, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Peña Barragán, José Manuel [0000-0003-4592-3792], López Granados, Francisca [0000-0001-9165-7558], Castro, Ana Isabel de [0000-0002-6699-2204], Jiménez-Brenes, Francisco Manuel [000-0002-9062-4911], Torres-Sánchez, Jorge [0000-0003-1420-0145], Escolà, Alexandre, Peña Barragán, José Manuel, López Granados, Francisca, Rosell-Polo, Joan R., Castro, Ana Isabel de, Gregorio, Eduard, Jiménez-Brenes, Francisco Manuel, Sanz, Ricardo, Sebé, Francesc, Llorens, Jordi, and Torres-Sánchez, Jorge

Abstract

Characterizing crop canopies is especially important in the management of woody crops. In this article, two systems were compared to characterise a 50 m long vineyard row section. One of the systems was a mobile terrestrial laser scanner based on a light detection and ranging (LiDAR) sensor (MTLS-LiDAR). The other was an uncrewed aerial vehicle (UAV) based system using digital aerial photogrammetry (UAV-DAP). The resulting 3D point clouds were assessed qualitatively and quantitatively. Canopy heights, widths and volumes were obtained in 0.1 m long sections along the studied row. All the parameters derived from the two systems presented statistically significant differences. The coefficients of determination between systems were 0.619 for canopy maximum heights above ground level (agl), 0.686 for 90th percentile (P90) heights agl, and 0.283 and 0.274 for maximum and P90 vegetated heights, respectively. Coefficients of determination between averaged maximum canopy width and P90 canopy width were 0.328 and 0.317, respectively. Coefficients of determination between cross-sectional areas determined from maximum widths, P90 widths and from the occupancy grid method were 0.423, 0.409 and 0.334, respectively. Total canopy volume for the entire row obtained from the three cross section estimation methods differed between 19 m3 and 25 m3. The reasons found were that the MTLS-LiDAR-derived point cloud captured the canopy top and side variability but could be affected by occlusions, mixed pixels and tall grass-like weeds present in the surveyed area. For its part, the UAV-DAP-derived point cloud tended to miss top and side shoots and somewhat smoothed canopy variability. As neither of the systems is optimal, a balance needs to be found according to the specific requirements of the survey. For this purpose, a list of pros and cons is presented to support the selection of one of the two systems for canopy monitoring. The MTLS-LiDAR system should be chosen when high detail is requ

Published
2023

19. Degree Sequences of PageRank Uniform Graphs and Digraphs with Prime Outdegrees

Author

López, Nacho, Sebé, Francesc, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lecroq, Thierry, editor, and Mouchard, Laurent, editor

Published
2013
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23. An Anonymity Model Achievable Via Microaggregation

Author

Domingo-Ferrer, Josep, Sebé, Francesc, Solanas, Agusti, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Jonker, Willem, editor, and Petković, Milan, editor

Published
2008
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25. Secure and Private Incentive-Based Advertisement Dissemination in Mobile Ad Hoc Networks

Author

Viejo, Alexandre, Sebé, Francesc, Domingo-Ferrer, Josep, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Miyaji, Atsuko, editor, Kikuchi, Hiroaki, editor, and Rannenberg, Kai, editor

Published
2007
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27. Optimal Multivariate 2-Microaggregation for Microdata Protection: A 2-Approximation

Author

Domingo-Ferrer, Josep, Sebé, Francesc, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Domingo-Ferrer, Josep, editor, and Franconi, Luisa, editor

Published
2006
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28. A Smart Card-Based Mental Poker System

Author

Castellà-Roca, Jordi, Domingo-Ferrer, Josep, Sebé, Francesc, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Dough, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Domingo-Ferrer, Josep, editor, Posegga, Joachim, editor, and Schreckling, Daniel, editor

Published
2006
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30. Noise-Robust Watermarking for Numerical Datasets

Author

Sebé, Francesc, Domingo-Ferrer, Josep, Solanas, Agustí, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Torra, Vicenç, editor, Narukawa, Yasuo, editor, and Miyamoto, Sadaaki, editor

Published
2005
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31. Dropout-Tolerant TTP-Free Mental Poker

Author

Castellà-Roca, Jordi, Sebé, Francesc, Domingo-Ferrer, Josep, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Katsikas, Sokratis, editor, López, Javier, editor, and Pernul, Günther, editor

Published
2005
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32. Secure Many-to-One Transmission of q-ary Symbols

Author

Martínez-Ballesté, Antoni, Sebé, Francesc, Domingo-Ferrer, Josep, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Aagesen, Finn Arve, editor, Anutariya, Chutiporn, editor, and Wuwongse, Vilas, editor

Published
2004
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33. Large-Scale Pay-As-You-Watch for Unicast and Multicast Communications

Author

Martínez-Ballesté, Antoni, Sebé, Francesc, Domingo-Ferrer, Josep, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Katsikas, Sokratis, editor, Lopez, Javier, editor, and Pernul, Günther, editor

Published
2004
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34. Outlier Protection in Continuous Microdata Masking

Author

Mateo-Sanz, Josep Maria, Sebé, Francesc, Domingo-Ferrer, Josep, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Domingo-Ferrer, Josep, editor, and Torra, Vicenç, editor

Published
2004
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35. On the Security of Noise Addition for Privacy in Statistical Databases

Author

Domingo-Ferrer, Josep, Sebé, Francesc, Castellà-Roca, Jordi, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Domingo-Ferrer, Josep, editor, and Torra, Vicenç, editor

Published
2004
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36. Secure Reverse Communication in a Multicast Tree

Author

Domingo-Ferrer, Josep, Martínez-Ballesté, Antoni, Sebé, Francesc, Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Mitrou, Nikolas, editor, Kontovasilis, Kimon, editor, Rouskas, George N., editor, Iliadis, Ilias, editor, and Merakos, Lazaros, editor

Published
2004
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48. WLC Preface

Author

Miret, Josep M., Sebé, Francesc, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sion, Radu, editor, Curtmola, Reza, editor, Dietrich, Sven, editor, Kiayias, Aggelos, editor, Miret, Josep M., editor, Sako, Kazue, editor, and Sebé, Francesc, editor

Published
2010
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