Summary Throughout the last few years the model used to provide office work environments has rema... more Summary Throughout the last few years the model used to provide office work environments has remained unchanged. It consists in the use of a personal computer, and the respective operating system and configuration per work place.
The second cause of death in the world is cancer. Although breast cancer is the more common cause... more The second cause of death in the world is cancer. Although breast cancer is the more common cause of death among women, the chance of survival can be increased by detecting cancer in the early stages. For this aim, there are different tests such as Magnetic Resonance Imaging (MRI), mammogram, ultrasound, thermogram and among these tests, the mammogram is the one which is used more frequently. Regarding the advantages and the results, which are achieved by thermogram, it can be a good alternative or complement for the mammogram if we can improve the weaknesses of the thermogram. For this reason, in this research, we work on a thermogram to see the possibility of having a good performance. On the other hand, we train another model by sending personal patients' information to see the effect of these data to improve the performance of breast cancer detection. In the end, we plan to separate the process between edge and core host to do the process faster, safer, and cost-effective.
Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estab... more Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estabilitzats de finestra (window stabilized ALOHA, WSA). Aquests protocols d'acces aleatori tenen resolucio dinamica i probabilistica i es poden seguir aplicant encara que el model de Poisson para el proces d'arribades no sigui valid. De partida, s'ha conjuntat la idea simple dels protocols ALOHA, amb l'eficiencia dels protocols de resolucio de col·lisions amb acces bloquejat, resultant una nova familia de protocols que tenen unes prestacions millorades respecte als existents amb el mateix model de sistema. Aquests protocols presentats i analitzats son una variant millorada del protocol Slotted-ALOHA estabilitzat, proposat per nombrosos autors, que aconseguien d'aquesta forma que l'algorisme arribes de forma estable a aconseguir un throughput de 0,36. El calcul analitic dels seus parametres: throughput i retard, permet quantificar la bondat d'aquests algorismes i comparar-los amb els ja existents. Els algorismes presentats aqui aconsegueixen un throughput de 0,4335 per al cas del feedback binari, 0,4365 per al cas del feedback ternario, i de 0,5052 per a un feedback optim.
Nowadays, video streaming applications are the most bandwidth-hungry applications and this tenden... more Nowadays, video streaming applications are the most bandwidth-hungry applications and this tendency is envisaged to grow exponentially. With the proliferation of multimedia capable devices, multimedia services have to deal with heterogeneous environments where very different types of terminals wish to receive content anywhere and anytime. This situation motivates the appearance of multimedia services that adapt contents to the specific context of users. These services can benefit from the use of different technologies for content delivery (e.g. Peer-to-Peer and Network Coding), media signalling (e.g. SIP and P2P protocols), media representation (e.g. MPEG-7 and MPEG-21) or multimedia scalable and robust codification (e.g. Multiple Description Coding and Scalable Video Coding). However, current Internet architecture is based on a rigid layered model (TCP/IP-based) following the, no longer valid, end-to-end argument, which makes difficult to introduce new functionalities efficiently. To solve this, Service Oriented Architectures (SOA) principles seem to fit in the proposal of new architectures for a more flexible Future Internet based on services that can be invoked when and where necessary. The objectives of this PhD. Thesis are exploring and validating different mechanisms for enabling Future Media Internet communications. To achieve this, we apply the SOA paradigm to provide efficient context-aware multimedia communications in the Future Internet. This work proposes solutions to enable the seamless provisioning of multimedia services in the Future Internet by means of context-aware service discovery and composition processes which are integrated in a novel service-oriented clean-slate architecture. One goal is to provide adapted and personalized services, dealing with high dynamic and heterogeneous environments. For this reason, this thesis includes research on novel media coding techniques (Multiple Description Coding, Scalable Video Coding) and distribution techniques (Peer-to-Peer, Network Coding) that can be applied to achieve seamless media communications. Moreover, context-aware service composition will address the requirements of media services (and any service in general), access methods, devices and interactions. This work presents a radical view of the Future Internet, where the necessary functionalities for accomplishing communications, in user devices, in the network and at all levels are considered as services. Services are not fixed but dynamically composed where and when necessary, with respect to user service requirements, network transfer capabilities and surrounding context in the user and the network environments. Composition of basic network-level services calls for a clean-slate approach to the Internet, while composition of higher level (transport and application) services prompts for an evolutionary approach. Nevertheless, composition of communication services manifests itself as a revolutionary way of looking communications and building communication systems. This PhD. Thesis introduces two main architectural innovations clearly beyond current state of the art. Firstly, a Service- Oriented framework able to deal with (existing) functionality at all levels (connectivity, transport, application) by considering the provided service and not the technology behind the functionality. All these service functionalities can be seen as services thanks to suitable service-oriented abstractions that allow including existing functionality/protocols as well as new functionality in a flexible way. Secondly, we present a novel service-oriented clean-slate architecture generalizing Information- Centric Networking (ICN) approaches. This work would propose the first clean-slate architecture completely aligned with the work done within the ISO Future Networks working group
Descripció: El objetivo es diseñar y administrar una Intranet para su posterior implantación en l... more Descripció: El objetivo es diseñar y administrar una Intranet para su posterior implantación en la empresa. Se tratará de elegir el gestor de contenidos (CMS) que mejor se adapte a los requisitos de la empresa. Para empezar se hará un estudio comparativo de los gestores ...
Page 1. EDICIONS VIRTUALS Jesus Alcober Simulació de models de teletrànsit mitjançant Java EDICIO... more Page 1. EDICIONS VIRTUALS Jesus Alcober Simulació de models de teletrànsit mitjançant Java EDICIONS UPC Page 2. Jesus Alcober Simulació de models de teletrànsit mitjançant Java Page 3. Aquest llibre correspon ...
Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estab... more Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estabilitzats de finestra (window stabilized ALOHA, WSA). Aquests protocols d'acces aleatori tenen resolucio dinamica i probabilistica i es poden seguir aplicant encara que el model de Poisson para el proces d'arribades no sigui valid. De partida, s'ha conjuntat la idea simple dels protocols ALOHA, amb l'eficiencia dels protocols de resolucio de col·lisions amb acces bloquejat, resultant una nova familia de protocols que tenen unes prestacions millorades respecte als existents amb el mateix model de sistema. Aquests protocols presentats i analitzats son una variant millorada del protocol Slotted-ALOHA estabilitzat, proposat per nombrosos autors, que aconseguien d'aquesta forma que l'algorisme arribes de forma estable a aconseguir un throughput de 0,36. El calcul analitic dels seus parametres: throughput i retard, permet quantificar la bondat d'aquests algorismes i comparar-los amb els ja existents. Els algorismes presentats aqui aconsegueixen un throughput de 0,4335 per al cas del feedback binari, 0,4365 per al cas del feedback ternario, i de 0,5052 per a un feedback optim.
En la actualidad, el modelo para proporcionar servicios basados en alojar cada aplicacion en un s... more En la actualidad, el modelo para proporcionar servicios basados en alojar cada aplicacion en un servidor fisico no es el modelo optimo, ya que los avances tecnologicos tanto en hardware como en software hacen que se produzca un desaprovechamiento de los recursos ofrecidos. Por este motivo, este trabajo presenta un nuevo modelo basado en un cluster de servidores con sistema de ficheros distribuido en red y virtualizacion de sistemas operativos que mejora la utilizacion de los recursos disponibles. Esta nueva arquitectura ofrece una nube privada que simplifica la gestion de los servicios y aporta una disminucion del coste de mantenimiento, ademas de anadir flexibilidad, dinamismo y escalabilidad al sistema.
In 2004, the Universitat Politècnica de Catalunya decided to change one of its critical and strat... more In 2004, the Universitat Politècnica de Catalunya decided to change one of its critical and strategic information services: the online teaching support platform. An Open Source software, Moodle, was adopted and the previous proprietary software was abandoned. In 2020, the home confinement of the population due to the pandemic caused by COVID-19 has been a stress test for the entire university community, and very specifically by those responsible for providing the support of the online teaching support platform. The increase in activity and the prospect of the generalization of online assessment raised the concerns of possible scalability issues with the quiz functionality during the examination period. The solution applied involved using Moodle’s IMS LTI interoperability features to deploy a high-performance version of the Moodle Quizz Module As A Service (SaaS), to plug-and-play within the university’s LMS without drawing on its internal resources. This solution combined with a sys...
Summary Throughout the last few years the model used to provide office work environments has rema... more Summary Throughout the last few years the model used to provide office work environments has remained unchanged. It consists in the use of a personal computer, and the respective operating system and configuration per work place.
The second cause of death in the world is cancer. Although breast cancer is the more common cause... more The second cause of death in the world is cancer. Although breast cancer is the more common cause of death among women, the chance of survival can be increased by detecting cancer in the early stages. For this aim, there are different tests such as Magnetic Resonance Imaging (MRI), mammogram, ultrasound, thermogram and among these tests, the mammogram is the one which is used more frequently. Regarding the advantages and the results, which are achieved by thermogram, it can be a good alternative or complement for the mammogram if we can improve the weaknesses of the thermogram. For this reason, in this research, we work on a thermogram to see the possibility of having a good performance. On the other hand, we train another model by sending personal patients' information to see the effect of these data to improve the performance of breast cancer detection. In the end, we plan to separate the process between edge and core host to do the process faster, safer, and cost-effective.
Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estab... more Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estabilitzats de finestra (window stabilized ALOHA, WSA). Aquests protocols d'acces aleatori tenen resolucio dinamica i probabilistica i es poden seguir aplicant encara que el model de Poisson para el proces d'arribades no sigui valid. De partida, s'ha conjuntat la idea simple dels protocols ALOHA, amb l'eficiencia dels protocols de resolucio de col·lisions amb acces bloquejat, resultant una nova familia de protocols que tenen unes prestacions millorades respecte als existents amb el mateix model de sistema. Aquests protocols presentats i analitzats son una variant millorada del protocol Slotted-ALOHA estabilitzat, proposat per nombrosos autors, que aconseguien d'aquesta forma que l'algorisme arribes de forma estable a aconseguir un throughput de 0,36. El calcul analitic dels seus parametres: throughput i retard, permet quantificar la bondat d'aquests algorismes i comparar-los amb els ja existents. Els algorismes presentats aqui aconsegueixen un throughput de 0,4335 per al cas del feedback binari, 0,4365 per al cas del feedback ternario, i de 0,5052 per a un feedback optim.
Nowadays, video streaming applications are the most bandwidth-hungry applications and this tenden... more Nowadays, video streaming applications are the most bandwidth-hungry applications and this tendency is envisaged to grow exponentially. With the proliferation of multimedia capable devices, multimedia services have to deal with heterogeneous environments where very different types of terminals wish to receive content anywhere and anytime. This situation motivates the appearance of multimedia services that adapt contents to the specific context of users. These services can benefit from the use of different technologies for content delivery (e.g. Peer-to-Peer and Network Coding), media signalling (e.g. SIP and P2P protocols), media representation (e.g. MPEG-7 and MPEG-21) or multimedia scalable and robust codification (e.g. Multiple Description Coding and Scalable Video Coding). However, current Internet architecture is based on a rigid layered model (TCP/IP-based) following the, no longer valid, end-to-end argument, which makes difficult to introduce new functionalities efficiently. To solve this, Service Oriented Architectures (SOA) principles seem to fit in the proposal of new architectures for a more flexible Future Internet based on services that can be invoked when and where necessary. The objectives of this PhD. Thesis are exploring and validating different mechanisms for enabling Future Media Internet communications. To achieve this, we apply the SOA paradigm to provide efficient context-aware multimedia communications in the Future Internet. This work proposes solutions to enable the seamless provisioning of multimedia services in the Future Internet by means of context-aware service discovery and composition processes which are integrated in a novel service-oriented clean-slate architecture. One goal is to provide adapted and personalized services, dealing with high dynamic and heterogeneous environments. For this reason, this thesis includes research on novel media coding techniques (Multiple Description Coding, Scalable Video Coding) and distribution techniques (Peer-to-Peer, Network Coding) that can be applied to achieve seamless media communications. Moreover, context-aware service composition will address the requirements of media services (and any service in general), access methods, devices and interactions. This work presents a radical view of the Future Internet, where the necessary functionalities for accomplishing communications, in user devices, in the network and at all levels are considered as services. Services are not fixed but dynamically composed where and when necessary, with respect to user service requirements, network transfer capabilities and surrounding context in the user and the network environments. Composition of basic network-level services calls for a clean-slate approach to the Internet, while composition of higher level (transport and application) services prompts for an evolutionary approach. Nevertheless, composition of communication services manifests itself as a revolutionary way of looking communications and building communication systems. This PhD. Thesis introduces two main architectural innovations clearly beyond current state of the art. Firstly, a Service- Oriented framework able to deal with (existing) functionality at all levels (connectivity, transport, application) by considering the provided service and not the technology behind the functionality. All these service functionalities can be seen as services thanks to suitable service-oriented abstractions that allow including existing functionality/protocols as well as new functionality in a flexible way. Secondly, we present a novel service-oriented clean-slate architecture generalizing Information- Centric Networking (ICN) approaches. This work would propose the first clean-slate architecture completely aligned with the work done within the ISO Future Networks working group
Descripció: El objetivo es diseñar y administrar una Intranet para su posterior implantación en l... more Descripció: El objetivo es diseñar y administrar una Intranet para su posterior implantación en la empresa. Se tratará de elegir el gestor de contenidos (CMS) que mejor se adapte a los requisitos de la empresa. Para empezar se hará un estudio comparativo de los gestores ...
Page 1. EDICIONS VIRTUALS Jesus Alcober Simulació de models de teletrànsit mitjançant Java EDICIO... more Page 1. EDICIONS VIRTUALS Jesus Alcober Simulació de models de teletrànsit mitjançant Java EDICIONS UPC Page 2. Jesus Alcober Simulació de models de teletrànsit mitjançant Java Page 3. Aquest llibre correspon ...
Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estab... more Aquesta tesi presenta una nova familia de protocols basats en contesa, els algorismes ALOHA estabilitzats de finestra (window stabilized ALOHA, WSA). Aquests protocols d'acces aleatori tenen resolucio dinamica i probabilistica i es poden seguir aplicant encara que el model de Poisson para el proces d'arribades no sigui valid. De partida, s'ha conjuntat la idea simple dels protocols ALOHA, amb l'eficiencia dels protocols de resolucio de col·lisions amb acces bloquejat, resultant una nova familia de protocols que tenen unes prestacions millorades respecte als existents amb el mateix model de sistema. Aquests protocols presentats i analitzats son una variant millorada del protocol Slotted-ALOHA estabilitzat, proposat per nombrosos autors, que aconseguien d'aquesta forma que l'algorisme arribes de forma estable a aconseguir un throughput de 0,36. El calcul analitic dels seus parametres: throughput i retard, permet quantificar la bondat d'aquests algorismes i comparar-los amb els ja existents. Els algorismes presentats aqui aconsegueixen un throughput de 0,4335 per al cas del feedback binari, 0,4365 per al cas del feedback ternario, i de 0,5052 per a un feedback optim.
En la actualidad, el modelo para proporcionar servicios basados en alojar cada aplicacion en un s... more En la actualidad, el modelo para proporcionar servicios basados en alojar cada aplicacion en un servidor fisico no es el modelo optimo, ya que los avances tecnologicos tanto en hardware como en software hacen que se produzca un desaprovechamiento de los recursos ofrecidos. Por este motivo, este trabajo presenta un nuevo modelo basado en un cluster de servidores con sistema de ficheros distribuido en red y virtualizacion de sistemas operativos que mejora la utilizacion de los recursos disponibles. Esta nueva arquitectura ofrece una nube privada que simplifica la gestion de los servicios y aporta una disminucion del coste de mantenimiento, ademas de anadir flexibilidad, dinamismo y escalabilidad al sistema.
In 2004, the Universitat Politècnica de Catalunya decided to change one of its critical and strat... more In 2004, the Universitat Politècnica de Catalunya decided to change one of its critical and strategic information services: the online teaching support platform. An Open Source software, Moodle, was adopted and the previous proprietary software was abandoned. In 2020, the home confinement of the population due to the pandemic caused by COVID-19 has been a stress test for the entire university community, and very specifically by those responsible for providing the support of the online teaching support platform. The increase in activity and the prospect of the generalization of online assessment raised the concerns of possible scalability issues with the quiz functionality during the examination period. The solution applied involved using Moodle’s IMS LTI interoperability features to deploy a high-performance version of the Moodle Quizz Module As A Service (SaaS), to plug-and-play within the university’s LMS without drawing on its internal resources. This solution combined with a sys...
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