Germán Madinabeitia

Experiences applying RM-ODP principles and techniques to intelligent transportation system architectures

This paper shows the early experiences transferring architectural knowledge from Academic to Industry within an R+D+I project. This is done through the design and development of an Intelligent Transportation System (ITS) Architecture following SOA and RM-ODP principles, to facilitate openness, reusability, scalability and interoperability. Rationale selection of standards, technologies and platforms, considering systems requirements (real time, cost ellipsis) has been done. An iterative agile development process, with incremental stages from design to final prototype, has been used. Early outcomes are centered in two services; multimedia flow management and notification. They have been developed using CORBA and are embedded in systems devices.

TVSP: A Tool for Validation Software Projects in programming labs

This work shows a testing tool used in Fundamentals of Programming II laboratory in Telecommunication Technologies Engineering Degree at University of Sevilla to check the student project. This tool allows students to test the proper operation of their project in autonomous way. This is a flexible and useful tool for testing the project because the tool identifies when the student has carried out a project that meet the given specifications of the project. This implies a high rate of success when the student delivers its project to the teacher.

Virtualization environment in telematics labs

The aim of this paper is to show the common scenario for practical content of subjects in the Department of Telematics Engineering by means of virtualization. This Department is responsible for a high number of laboratory groups, requiring many teachers and a high workload. A common environment for all practice groups is desired. A virtual machine was built with the same environment of the Computing Centre at School of Engineering at University of Seville. Then, this virtual machine was provided to students and is used to do practices. This article describes this experience and shows the improvements obtained.

A Productivity-Based Approach to LAN Topology Design

Over the useful life of a LAN, network downtimes will have a negative impact on organizational productivity not included in current Network Topological Design (NTD) problems. We propose a new approach to LAN topological design that includes the impact of these productivity losses into the network design, minimizing not only the CAPEX but also the expected cost of unproductiveness attributable to network downtimes over a certain period of network operation.

Adaptative control of packetization to improve the energy efficiency of VoIP applications in IEEE 802.11 networks

This paper presents an adaptive algorithm that improves the energy efficiency of VoIP applications over IEEE 802.11 networks. The algorithm seeks to achieve the largest energy savings subject to reaching a minimum speech quality under the prevailing network conditions. The control mechanism used is the dynamic selection of the packet size during the communication. Three different variants of the algorithm a presented. Our proposal has been implemented in a VoIP application and experimentally validated in a testbed, and the results demonstrate that our packetization period control algorithm can provide energy savings in uncongested IEEE 802.11 networks (up to 30%). Furthermore, under poor network conditions the algorithm can prolong the duration of the call before it is dropped at the expense of a higher energy consumption during such conditions. Each variant of the algorithm provides a unique balance between keeping quality and saving energy.

Improving the energy efficiency of VoIP applications in IEEE 802.11 networks through control of the packetization rate

This paper presents an adaptive algorithm that improves the energy efficiency of VoIP applications over IEEE 802.11 networks. The algorithm seeks to achieve the largest energy savings subject to reaching a minimum speech quality under the prevailing network conditions. The control mechanism used is the dynamic selection of the packet size during the communication. This algorithm has been implemented in an experimental testbed and the results demonstrate that our packetization rate control algorithm can provide energy savings in uncongested IEEE 802.11 networks (up to 30%). Furthermore, under poor network conditions the algorithm can prolong the duration of the call before it is dropped at the expense of a higher energy consumption.

Modeling the healthcare assistance process for comorbidity patients compliant with prEN12967

The increment of life expectancy in our society, and the consequent population ageing, anticipate that the health sector must face the challenges associated with a growing population group of elderly patients with numerous disorders, generally chronic. In this work we introduce a framework to support the communication and information management tasks involved in a coordinated care of this kind of patients. This framework has been developed in the European context, it is compliant with CENs prEN12967, and follows ITU-Ts ODP methodology, that facilitates its integration in any system following this standard

Providing Real Time Applications with a Seamless Handover Using a Combination of Hierarchical Mobile IPv6 and Fast Handover

Users of real time applications expect to roam between fixed and different wireless networks without notice, therefore handovers are expected to be seamless. The use of IP, and specifically Mobile Ipv6, as a transport technology solves some of the internetworking problems, but not the seamless handover. Although some extensions, as Hierarchical Mobile Ipv6 and Fast Handover, were introduced, these extensions, and combinations of them, do not offer an optimal handover performance. In this article, a new combination of these two extensions is proposed. This solution tries to solve the problems of seamless handoff for real time applications.