Agenda de eventos

22 Mar
2013

RIA-ICCS: Intercell Coordinated Scheduling Exploiting Application Reservation Information

Vincenzo Sciancalepore, Estudiante de doctorado, IMDEA Networks Institute & Universidad Carlos III de Madrid (UC3M)
Intercell coordination and cooperation techniques are some of the most promising approaches to increase the spectral efficiency of future wireless systems as required by the forecasted market needs. Among them, intercell coordinated scheduling (ICCS) arises as a near-term feasible solution due to its lower inter-BS communication requirements when compared to full cooperative approaches. In this paper we present our proposed Reservation Information Aware Intercell Coordinated Scheduling (RIA-ICCS) solution which considers application reservation information when constructing an interference graph for ICCS purposes.
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14 Mar
2013

Modeling Systems from Logs of their Behavior

Ivan Beschastnikh, PhD student, University of Washington, USA
Logged messages are invaluable for debugging and diagnosing problems. Unfortunately, many execution logs are inscrutable in their raw form. For example, a production Google system may generate a billion-line log file in a single day. In my talk, I will detail two log-analysis tools that I developed to deal with this problem. These tools infer concise and precise models from large execution logs of sequential and distributed systems. Both tools enable new kinds of program analyses and make logs more useful to developers.
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13 Mar
2013

Short guidelines for writing scientific papers

Arturo Azcorra, Director, Institute IMDEA Networks; Catedrático, Departamento de Ingeniería Telemática, Universidad Carlos III de Madrid, España
Arturo Azcorra presentará cuáles son, en su experiencia personal, las mejores prácticas para la redacción de un documento técnico. La conferencia cubrirá algunas ideas a seguir y algunos problemas a evitar al escribir un artículo.
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12 Mar
2013

Optimization in optical networks

Prof. Shmuel Zaks, Cátedra de Excelencia, Departamento de Ingeniería Telemática, Universidad Carlos III de Madrid; Investigador Visitante, Institute IMDEA Networks; Chair Professor of Computer Science, Technion, Israel
In the talk I overview some recent results for optimization problems that originate in optical networks. They deal with optimizing the utilization of regenerators (switching components that regenerate a signal after a certain distance) and ADMs (Add-Drop Multiplexers).
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25 Feb
2013

The hidden costs of mobile applications

Narseo Vallina-Rodriguez, PhD candidate in Computer Science, Computer Lab, University of Cambridge, Reino Unido
Mobile phones and tablets can be considered as the first incarnation of the post-PC era. Their explosive adoption rate has been driven by a number of factors, with the most significant influence being touch-screens, sensors, app markets, and better cellular technologies.
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20 Feb
2013

All-path and Torii-HLMAC: beyond link-state routing protocols in shortest path bridges for campus and data center networks

Elisa Rojas. Introduction by Guillermo Ibáñez. University of Alcalá de Henares, Madrid, Spain
The dominant paradigm in both IETF and IEEE 802.1 standards for shortest path bridges is based on link-state routing in layer two. This results on hybrid devices of router and switch.
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13 Feb
2013

Online Testing of Distributed Systems

Dejan Kostić, Senior Researcher, IMDEA Networks Institute
It is notoriously difficult to make distributed systems reliable. This becomes even harder in the case of the widely-deployed systems that are heterogeneous (multiple implementations) and federated (multiple administrative entities).
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7 Feb
2013

Defensa Tesis Doctoral: Experimental Analysis of the Socio-Economic Phenomena in the BitTorrent Ecosystem

Michal Kryczka, Estudiante de doctorado, IMDEA Networks Institute & Universidad Carlos III de Madrid (UC3M)
BitTorrent is the most successful Peer-to-Peer (P2P) application and is responsible for a major portion of Internet traffic. It has been largely studied using simulations, models and real measurements. Although simulations and modelling are easier to perform, they typically simplify analysed problems and in case of BitTorrent they are likely to miss some of the effects which occur in real swarms.​
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6 Feb
2013

Silver-lining: a firsthand vision of launching a technological start-up

Vishal Misra, Co-founder & CEO, Silver Lining
Vishal Misra together with Dan Rubinstein launched at the beginning of 2011 the company Silver Lining. This company is a very ambitious tech start-up arising from two professors of Columbia University, and has already attracted a lot of interest and a substantial amount of funding from investors. Silver Lining is developing a very advanced product in the area of content distribution networks that is expected to have high impact. Vishal Misra, co-founder and its current CEO, will give a first-hand account on the development of this interesting initiative.
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4 Feb
2013

Corridor-based routing using opportunistic forwarding in OFDMA multi-hop networks

Alexander Kuehne, Post-doc Researcher, Communications Engineering Lab, Technische Universität Darmstadt, Germany
In multi-hop networks, conventional unipath routing approaches force the data transmission to follow a fixed sequence of nodes. In this talk, we widen this path to create a corridor of forwarding nodes. Within this corridor, data can be split and joined at different nodes as the data travels through the corridor towards the destination node. To split data, decode-and forward OFDMA is used since with OFDMA, one can exploit the benefits of opportunistically allocating different subcarriers to different nodes according to their channel conditions. To avoid interference, each subcarrier is only allocated once per hop. For the presented scheme, the problem of optimizing the network throughput by means of resource and power allocation is formulated and two suboptimal algorithms are proposed to solve this problem with feasible effort. Simulations show that in multi-hop networks corridor-based routing using opportunistic forwarding outperforms conventional unipath routing approaches in terms of achievable throughput.
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