Autonomous and Self-sufficient Groups: Ad hoc Collaborative Environments

Asynchronous collaborative applications and systems have to deal with complexities associated with interaction nature, idiosyncrasy of groups and technical and administrative issues of real settings. Existing solutions address asynchronous collaboration via simplified and centralized models. In this paper we present LaCOLLA, a fully decentralized middleware for building collaborative applications that provides general purpose collaborative functionality without requiring anyone to provide resources for the whole group. This helps applications to incorporate collaboration support and deal with most complexities derived from groups and its members. The implementation of LaCOLLA follows the peer-to-peer paradigm and pays special attention to the autonomy of its members and to the self-organization of its components. Resources (e.g. storage, task execution) and services (e.g. authorization) are provided by its members, avoiding dependency from third party agents or servers. This work was first validated by simulation. Then we built the middleware and adapted some collaborative applications

Privacy in microblogging online social networks: issues and metrics

In the era of digital life, privacy is threatened by the rapid expansion of online social media, especially Microblogging Online Social Networks (MOSNs). Whether users are connected in real life or not, microblogging systems are a popular form of Online Social Networks (OSNs) that allow users to post short messages, share interests, and communicate with each other. Despite this popularity, they have a poor reputation in terms of protecting the privacy of users. The present paper examines different types of privacy threats and concerns in MOSNs. The threats can be either classic and common to other online platforms or specific to the environment of OSNs. In addition, this article describes various models that assess and quantify privacy in OSNs and finally proposes a new generic framework to evaluate the privacy in MOSNs. The proposed framework indicates the level of privacy protection provided by the system and helps to compare different MOSNs

Improving the Introduction to a Collaborative Project-Based Course on Computer Network Applications

Abstract. In engineering studies, there is a shift to new teaching methodologies with focus on the student involvement, like project-based learning. Projectbased learning courses, however, often relay on a previous course where the technical background to be used in the projects is taught, requiring this way two terms for an area. In this paper, we consider a project-based course on computer network applications, which has been designed to cover both the technical and non-technical content in only one term. In the three years we have been teaching this course, our observation based on questionnaires is that the organization of the course allows to successfully reaching the course objectives. We feel, however, that we do not fully exploit the learning potential the course could have in the first few weeks of the course. We describe how the course is organized and the problems we have identified. We propose a project demonstration tool and describe how our solution improves towards our goals. With the proposed tool, the students should better obtain already in the very first days of the course a clear vision about the projects, allowing fully taking advantage of the opportunities which the course offers

Privacy in microblogging online social networks: issues and metrics

In the era of digital life, privacy is threatened by the rapid expansion of online social media, especially Microblogging Online Social Networks (MOSNs). Whether users are connected in real life or not, microblogging systems are a popular form of Online Social Networks (OSNs) that allow users to post short messages, share interests, and communicate with each other. Despite this popularity, they have a poor reputation in terms of protecting the privacy of users. The present paper examines different types of privacy threats and concerns in MOSNs. The threats can be either classic and common to other online platforms or specific to the environment of OSNs. In addition, this article describes various models that assess and quantify privacy in OSNs and finally proposes a new generic framework to evaluate the privacy in MOSNs. The proposed framework indicates the level of privacy protection provided by the system and helps to compare different MOSNs

Redes Multimedia, setiembre 2010

L'assignatura Xarxes multimèdia, de 6 crèdits ECTS, és una assignatura obligatòria dels Estudis del Grau de Multimèdia. En ella es presenta una visió global i introductòria de les xarxes de computadors. Es du a terme una aproximació de dalt a baix, fent més èmfasi en els aspectes més relacionats amb la titulació i deixant de banda aquells aspectes més relacionats amb la comunicació des del punt de vista físic a la teoria del senyal. En aquesta assignatura es presenten les bases de les xarxes de comunicacions, com s'estructuren, quins dispositius les integren, quines són les normes i protocols que regeixen la comunicació, quines són les seves aplicacions i serveis, i tot prenent com a exemple la xarxa d'Internet.La asignatura Redes multimedia, de 6 créditos ECTS, es una asignatura obligatoria de los estudios del Grado de Multimedia. En ella se presenta una visión global e introductoria de las redes de computadores. Se lleva a cabo una aproximación de arriba abajo enfatizando los aspectos más relacionados con la titulación y dejando de lado aquellos relacionados con la comunicación en el ámbito físico en la teoría de la señal. Esta asignatura presenta las bases de las redes de comunicaciones, cómo se estructuran, qué dispositivos las integran, cuáles son las normas y protocolos que rigen la comunicación, cuáles sus aplicaciones y servicios, y todo tomando como ejemplo la red de Internet.Multimedia Networking Course is a compulsory subject in the UOC's Multimedia Degree program. It presents an overview and introduction to computer networks. It is shown in a top-down approach emphasizing the aspects related to the degree and leaving aside those related to telecommunication related with signal theory. This course presents the basis in communications networks, how they are structured, which devices integrate them, which are the standards and protocols for communication, what are their applications and services, using the Internet as an example

Xarxes multimèdia, setembre 2010

L'assignatura Xarxes multimèdia, de 6 crèdits ECTS, és una assignatura obligatòria dels Estudis del Grau de Multimèdia. En ella es presenta una visió global i introductòria de les xarxes de computadors. Es du a terme una aproximació de dalt a baix, fent més èmfasi en els aspectes més relacionats amb la titulació i deixant de banda aquells aspectes més relacionats amb la comunicació des del punt de vista físic a la teoria del senyal. En aquesta assignatura es presenten les bases de les xarxes de comunicacions, com s'estructuren, quins dispositius les integren, quines són les normes i protocols que regeixen la comunicació, quines són les seves aplicacions i serveis, i tot prenent com a exemple la xarxa d'Internet.La asignatura Redes multimedia, de 6 créditos ECTS, es una asignatura obligatoria de los estudios del Grado de Multimedia. En ella se presenta una visión global e introductoria de las redes de computadores. Se lleva a cabo una aproximación de arriba abajo enfatizando los aspectos más relacionados con la titulación y dejando de lado aquellos relacionados con la comunicación en el ámbito físico en la teoría de la señal. Esta asignatura presenta las bases de las redes de comunicaciones, cómo se estructuran, qué dispositivos las integran, cuáles son las normas y protocolos que rigen la comunicación, cuáles sus aplicaciones y servicios, y todo tomando como ejemplo la red de Internet.Multimedia Networking Course is a compulsory subject in the UOC's Multimedia Degree program. It presents an overview and introduction to computer networks. It is shown in a top-down approach emphasizing the aspects related to the degree and leaving aside those related to telecommunication related with signal theory. This course presents the basis in communications networks, how they are structured, which devices integrate them, which are the standards and protocols for communication, what are their applications and services, using the Internet as an example

Xarxes multimèdia, setembre 2010

L'assignatura Xarxes multimèdia, de 6 crèdits ECTS, és una assignatura obligatòria dels Estudis del Grau de Multimèdia. En ella es presenta una visió global i introductòria de les xarxes de computadors. Es du a terme una aproximació de dalt a baix, fent més èmfasi en els aspectes més relacionats amb la titulació i deixant de banda aquells aspectes més relacionats amb la comunicació des del punt de vista físic a la teoria del senyal. En aquesta assignatura es presenten les bases de les xarxes de comunicacions, com s'estructuren, quins dispositius les integren, quines són les normes i protocols que regeixen la comunicació, quines són les seves aplicacions i serveis, i tot prenent com a exemple la xarxa d'Internet.La asignatura Redes multimedia, de 6 créditos ECTS, es una asignatura obligatoria de los estudios del Grado de Multimedia. En ella se presenta una visión global e introductoria de las redes de computadores. Se lleva a cabo una aproximación de arriba abajo enfatizando los aspectos más relacionados con la titulación y dejando de lado aquellos relacionados con la comunicación en el ámbito físico en la teoría de la señal. Esta asignatura presenta las bases de las redes de comunicaciones, cómo se estructuran, qué dispositivos las integran, cuáles son las normas y protocolos que rigen la comunicación, cuáles sus aplicaciones y servicios, y todo tomando como ejemplo la red de Internet.Multimedia Networking Course is a compulsory subject in the UOC's Multimedia Degree program. It presents an overview and introduction to computer networks. It is shown in a top-down approach emphasizing the aspects related to the degree and leaving aside those related to telecommunication related with signal theory. This course presents the basis in communications networks, how they are structured, which devices integrate them, which are the standards and protocols for communication, what are their applications and services, using the Internet as an example

An architecture for decentralized service deployment

Peer-reviewedIn this paper we present a proposal of the architecture for a system which allows the deployment of services in a group of computers, connected in a peer-to-peer fashion. This architecture is divided in layers, and each of them contains some components which offer specific functions. By putting them together, we obtain a system with desirable characteristics such as scalability, decentralization, ability to deal with heterogeneity, fault tolerance, load-balancing, and self-* properties

DyMRA : Dynamic Market Deployment for Decentralized Resource Allocation

Preprin

Computing the error linear complexity spectrum of a binary sequence of period 2"n

SIGLEAvailable from British Library Document Supply Centre-DSC:4335.26205(1999-128-R1) / BLDSC - British Library Document Supply CentreGBUnited Kingdo