Embedded sensor systems are well suited to provide context data, i.e. any information which allows determining the context of entities (e.g. a user's location, an object's environmental parameters, or the number of people in a room). The additional integration of actuators allows interaction with the real world, e.g. control of heating, ventilation, or lighting. However, the big gap between the heterogeneous set of devices providing sensing and/or actuation needs to be bridged to enable smart context-aware applications. Special consideration hereby needs to be given to the efficient use of the available energy budget and the support for device heterogeneity. In this talk, means towards energy-efficient data transfer by applying header and payload compression for Wireless Sensor and Actuator Networks (WSAN) are presented, as well as our approach towards the seamless integration of WSAN nodes through using semantic self-descriptions and means towards unifying the access to node resources.

Whereas prefix hijacking is usually examined from security perspectives, this paper looks at it from a novel economic angle. Our study stems from an observation that a transit AS (Autonomous System) has a financial interest in attracting extra traffic to the links with its customers. Based on real data about the actual hijacking incident in the Internet, we conduct simulations in the real AS-level Internet topology with synthetic demands for the hijacked traffic. Then, we measure traffic on all inter-AS links and compute the payments of all providers. The analysis of our results from technical, business, and legal viewpoints suggests that hijacking-based traffic attraction is a viable strategy that can create a fertile ground for tussles between providers. In particular, giant top-tier providers appear to have the strongest financial incentives to hijack popular prefixes and then deliver the intercepted traffic to the proper destinations. We also discuss directions for future research in the area of hijacking-based traffic attraction.

Coordinación: Dirección General de Universidades e Investigación, a través de la Fundación madri+d, Comunidad de Madrid

La iniciativa IMDEA participará en la actividad “Por qué soy científico”, por medio de la intervención los directores de cada uno de los ocho institutos que la componen.

Por qué soy científico

Organizador: Instituto Madrileño de Estudios Avanzados (IMDEA)

Horario: De 18:00 a 19:30

Lugar de celebración y accesos:
Medialab Prado
C/ Alameda, 15. Madrid
Metro: Atocha y Cercanías: Atocha
Autobuses: 6, 10, 14, 19, 26, 27, 32, 34, 37 y 45

Disruptive events such as large-scale power outages, undersea cable cuts, or Internet worms could cause the Internet to deviate from its normal state of operation. This deviation from normalcy is what we call the impact on the Internet, which we also refer to as an "Internet earthquake."

Programa:

09:00 - 09:30 Bienvenida y registro de asistentes

09:30 - 09:50 Apertura de la jornada
D. Arturo Azcorra, Director General, CDTI
D. Francisco Marín, Presidente Área de Actuación de Innovación Tecnológica, AETIC
D. Albert Banchs, Director, Institute IMDEA Networks
D. Carlos Balaguer, Vicerrector de Investigación, UC3M

09:50 - 10:15 Presentaciones
Presentación del Institute IMDEA Networks, D. Albert Banchs (  Descargar presentación 2006 Kb )
Presentación del departamento de I+D+i de AETIC, D. Juan Gascón, Director de Contenidos Digitales e I+D+i de AETIC
(  Descargar presentación 2256 Kb )

10:15 - 11:00 Bloque “Eficiencia Energética”
Energy-efficient Networking at Institute IMDEA Networks
D. Antonio Fernández Anta, Senior Researcher, Institute IMDEA Networks (  Descargar presentación 160 Kb )
TELVENT Energía
D. Francisco Romero, Director Desarrollo de Negocio (  Descargar presentación 1.757 Kb )
INDRA
Dña. Marta Arias, Gerente Área de Eficiencia Energética (  Descargar presentación 538 Kb )

The talk consists of two parts. The first part will present an overview on the current research activities of iNEXT (Centre for Innovation in IT applications and Services) at the University of Technology, Sydney. This includes a brief description of our Sensor Grid for Assistive Healthcare project.

Improving the energy-efficiency of core routers is important for ISPs and equipment vendors alike. We tackle this problem by focusing on packet buffers in backbone router line-cards. We broadly classify the talk into two parts - an evolutionary approach and a clean-slate design. In the former, we propose a simple power saving mechanism that turns buffers on/off to save energy. Our scheme can be incrementally deployed today and requires minimal changes to existing line-card design. In the latter, we examine the impact of very small buffers when both real-time and TCP traffic coexist in the network.

BitTorrent is the most popular P2P content delivery appli-cation where individual users share various type of content with tens of thousands of other users. The growing popular-ity of BitTorrent is primarily due to the availability of valuable content without any cost for the consumers. However, apart from required resources, publishing (sharing) valuable (and often copyrighted) content has serious legal implica-tions for users who publish the material (or publishers). This raises a question that whether (at least major) content publishers behave in an altruistic fashion or have other incentives such as financial. In this study, we identify the content publishers of more than 55K torrents in two major BitTorrent portals and examine their behavior. We demonstrate that a small fraction of publishers is responsible for 67% of the published content and 75% of the downloads. Our investigations reveal that these major publishers respond to two dif-ferent profiles. On the one hand, antipiracy agencies and ma-licious publishers publish a large amount of fake files to protect copyrighted content and spread malware respectively. On the other hand, content publishing in BitTorrent is largely driven by companies with financial incentives. Therefore, if these companies lose their interest or are unable to publish content, BitTorrent traffic/portals may disappear or at least their associated traffic will be significantly reduced.

Ponente: 
Lugar: 
Fecha: 19 de octubre, 2010, 16:00h
Organización: 

Since its inception in 2005, YouTube has seen explosive growth in its popularity; today it is indisputably the world’s largest video sharing site. Given the number of viewers and the accompanying traffic volume, its geographical span and scale of operations, the design of YouTube’s content delivery infrastructure is a highly challenging engineering task. In this talk, I will present our recent studies on "reverse-engineering" the YouTube video delivery system through passive and active measurements.