http://hdl.handle.net/2117/3881 2013-05-25T13:43:05Z http://hdl.handle.net/2117/17412 Title: More hybrid and secure protection of statistical data sets Authors: Herranz Sotoca, Javier; Nin Guerrero, Jordi; Solé Simó, Marc Abstract: Different methods and paradigms to protect data sets containing sensitive statistical information have been proposed and studied. The idea is to publish a perturbed version of the data set that does not leak confidential information, but that still allows users to obtain meaningful statistical values about the original data. The two main paradigms for data set protection are the classical one and the synthetic one. Recently, the possibility of combining the two paradigms, leading to a hybrid paradigm, has been considered. In this work, we first analyze the security of some synthetic and (partially) hybrid methods that have been proposed in the last years, and we conclude that they suffer from a high interval disclosure risk. We then propose the first fully hybrid SDC methods; unfortunately, they also suffer from a quite high interval disclosure risk. To mitigate this, we propose a postprocessing technique that can be applied to any data set protected with a synthetic method, with the goal of reducing its interval disclosure risk. We describe through the paper a set of experiments performed on reference data sets that support our claims 2013-01-17T18:24:07Z http://hdl.handle.net/2117/16561 Title: Kd-trees and the real disclosure risks of large statistical databases Authors: Herranz Sotoca, Javier; Nin Guerrero, Jordi; Solé Simó, Marc Abstract: In data privacy, record linkage can be used as an estimator of the disclosure risk of protected data. To model the worst case scenario one normally attempts to link records from the original data to the protected data. In this paper we introduce a parametrization of record linkage in terms of a weighted mean and its weights, and provide a supervised learning method to determine the optimum weights for the linkage process. That is, the parameters yielding a maximal record linkage between the protected and original data. We compare our method to standard record linkage with data from several protection methods widely used in statistical disclosure control, and study the results taking into account the performance in the linkage process, and its computational effort 2012-09-25T11:53:08Z http://hdl.handle.net/2117/14434 Title: Architectures and technologies for adapting secured content in governed multimedia applications Authors: Carreras, Anna; Rodríguez Luna, Eva; Dogan, Safak; Arachchi, Hemantha Kodikara; Perramon, Xavier; Delgado Mercè, Jaime; Kondoz, Ahmet M. Abstract: This article analyzes existing initiatives and proposes new technologies for the governed adaptations of secured content in heterogeneous environments. These technologies are integrated into an architecture for the secure management of multimedia content. 2012-01-09T16:19:47Z http://hdl.handle.net/2117/12605 Title: Interoperable digital rights management based on the MPEG Extensible Middleware Authors: Rodríguez Doncel, Víctor; Delgado Mercè, Jaime; Chiariglione, Filippo; Preda, Marius; Timmerer, Christian Abstract: This paper describes an interoperable Digital Rights Management architecture promoted by the MPEG standardization group in its new standard known as MPEG-M or MPEG Extensible Middleware (MXM). The goal of this standard is to promote the packaging and reusability ofMPEG technologies, and for this it specifies a software middleware platform and a complete set of APIs and protocols. These APIs allow uniformly handling digital content and developing generic multimedia applications, through a set of modules communicated with standard protocols. The MXM standard provides the necessary mechanisms to digitally manage the rights over Intellectual Property, the tools to protect the media and the means to grant the rights enforcement, besides a rich set of libraries to reproduce the content. 2011-05-18T14:56:15Z http://hdl.handle.net/2117/12004 Title: The Impact of Context Information on User Privacy in Social Networks Authors: Carreras Coch, Anna; Delgado Mercè, Jaime; Rodríguez Luna, Eva; Tous, Ruben Abstract: Context-aware applications are becoming very popular as they are a mean of enriching users' experiences in multimedia scenarios. Nevertheless, the acquisition, representation, and protection of contextual information are still open issues that need to be addressed. These are significant topics of interest mainly due to today's growing concern on user privacy, and are particularly relevant in the context of Social Networks. In this paper, we briefly present our work development within the Visnet-II Network of Excellence (NoE) on context acquisition and protection for context-based content adaptation. We identify the sensitive contextual information used within Social Network application scenario, and then specify a suitable privacy model. Finally, we describe how this model could be implemented through the use of the MPEG-21 Rights Expression Language (REL) Standard. 2011-03-21T18:32:23Z http://hdl.handle.net/2117/11647 Title: Follow-up and feedback processes in the EHEA Authors: Valero García, Miguel; Santamaria Barnadas, Eduard; Salamí San Juan, Esther; Canto Rodrigo, Pablo del; Gallego Fernández, María Isabel; López Canalda, José Manuel; Medina, Esunly; Mochón Duro, Francisco; Mora Serrano, Javier; Reyes Muñoz, María Angélica; Rodríguez Luna, Eva Abstract: In the present paper, we describe the work being carried out by a group of professors so as to implement the follow-up and feedback processes of the activities students do throughout the first academic years in their Engineering studies. Not to mention, this project is within the EHEA (European Higher Education Area) framework. Our results show that these processes are key to enhance students learning, they can also have an impact in their academic performance and can be optimized in such a way that professors can assume the time it requires. 2011-03-03T15:50:58Z http://hdl.handle.net/2117/11297 Title: Approaching the rights management interoperability problem using intelligent brokerage mechanisms Authors: Serrão, Carlos; Rodríguez Luna, Eva; Delgado Mercè, Jaime Abstract: The digital content industry is facing significant challenges. One of the most significant challenges is the Intellectual Property protection. This challenge has been addressed technologically by using Digital Rights Management (DRM) systems that on a first stage ensured the appropriate management over digital content. However, rights management systems, as they are today, are completely non-interoperable, creating immense problems to the digital content final users. Perhaps one of the biggest problems is the fact that the same digital content that is governed by different rights management systems cannot be exchanged between different rights governance systems. This paper presents some of the work that has been performed under the framework of the VISNET-II Network of Excellence (NoE) to address some of the rights management systems interoperability problems. The approach followed by the proposed work consists on the usage of service description and service-oriented architectures as a mean to create a common and interoperable environment between the different systems. 2011-02-07T15:47:43Z http://hdl.handle.net/2117/9117 Title: La evaluación en el contexto del Espacio Europeo de Educación Superior. Authors: Valero García, Miguel; Santamaria Barnadas, Eduard; Canto Rodrigo, Pablo del; Gallego Fernández, María Isabel; López Canalda, José Manuel; Mochón Duro, Francisco; Mora Serrano, Javier; Reyes Muñoz, María Angélica; Rodríguez Luna, Eva; Sanjeevan, Kanapathipillai Abstract: La evaluación es un elemento que preocupa siempre a todos los implicados en el proceso educativo (profesores, alumnos, responsables académicos, etc.). Sin embargo, la evaluación es un concepto muy amplio y no todas sus facetas preocupan de igual manera ni reciben la misma atención. Evaluar, desde luego, es asignar una calificación que refleje el nivel de aprendizaje. Pero evaluar es también identificar lo que debe mejorarse de cara al curso siguiente. En nuestro artículo, partiendo del modelo de Donald Kirkpatrick sobre los diferentes enfoques de la evaluación, describimos las estrategias y técnicas que utilizamos en la actualidad para desplegar un sistema de evaluación de amplio alcance, en el contexto del proceso de adaptación de nuestras asignaturas de primeros cursos de ingeniería a los requerimientos del Espacio Europeo de Educación Superior (EEES). Precisamente en el contexto del EEES algunos enfoques de la evaluación a los que normalmente se presta poca atención, como es el caso de la evaluación del seguimiento de la actividad del alumno, adquieren una relevancia muy importante. 2010-09-27T17:31:19Z http://hdl.handle.net/2117/8916 Title: Cómo usamos Moodle en nuestras asignaturas adaptadas al EEES Authors: Valero García, Miguel; Canto Rodrigo, Pablo del; Gallego Fernández, María Isabel; López Canalda, José Manuel; Mora Serrano, Javier; Reyes Muñoz, María Angélica; Rodríguez Luna, Eva; Sanjeevan, Kanapathipillai; Santamaria Barnadas, Eduard Abstract: This paper describes how do we use our digital campus based on Moodle as a key tool in our subjects. These subjects belong to a first course in an engineering degree and have been adapted to the requirements of the European Higher Education Area in accordance with an educational model whose essential elements are the detailed planning of student work, both in class and out of class, and the evaluation of student work with frequent feedback. Our experience indicates that the digital campus has become an essential tool that allows us to be very productive in implementing the educational model, in a scenario with several groups of class and several teachers teaching the same program. This paper describes our educational model and how few resources our Moodle based digital campus are used to support key elements of this model. 2010-09-16T13:38:36Z http://hdl.handle.net/2117/7812 Title: Guest editorial special issue: multimodal multimedia retrieval Authors: Döller, Mario; Chang, Wo; Delgado Mercè, Jaime; Brunie, Lionel 2010-06-23T12:58:08Z