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Real-time functional magnetic resonance imaging (rtfMRI) is an emerging approach for studying the functioning of the human brain. Computational challenges combined with high data velocity have to this point restricted rtfMRI analyses to studying regions of the brain independently. However, given that neural processing is accomplished via functional interactions among brain regions, neuroscience could...
The scale of functional magnetic resonance image data is rapidly increasing as large multi-subject datasets are becoming widely available and high-resolution scanners are adopted. The inherent low-dimensionality of the information in this data has led neuroscientists to consider factor analysis methods to extract and analyze the underlying brain activity. In this work, we consider two recent multi-subject...
Accounting mechanisms based on credit are used in peer-to-peer systems to track the contribution of peers to the community for the purpose of deterring freeriding and rewarding good behavior. Most often, peers earn credit for uploading files, but other activities might be rewarded in the future as well, such as making useful comments or reporting spam. Credit earned can be used for accessing new content,...
In this paper we present the scaling of BTWorld, our MapReduce-based approach to observing and analyzing the global BitTorrent network which we have been monitoring for the past 4 years. BTWorld currently provides a comprehensive and complex set of queries implemented in Pig Latin, with data dependencies between them, which translate to several MapReduce jobs that have a heavy-tailed distribution...
The commoditization of big data analytics, that is, the deployment, tuning, and future development of big data processing platforms such as MapReduce, relies on a thorough understanding of relevant use cases and workloads. In this work we propose BTWorld, a use case for time-based big data analytics that is representative for processing data collected periodically from a global-scale distributed system...
P2P communities that use credits to incentivize their members to contribute have emerged over the last few years. In particular, private BitTorrent communities keep track of the total upload and download of each member and impose a minimum threshold for their upload/download ratio, which is known as their sharing ratio. It has been shown that these private communities have significantly better download...
Peer-to-peer systems owe much of their success to user contributed resources like storage space and bandwidth. At the same time, popular collaborative systems like Wikipedia or StackExchange are built around user-contributed knowledge, judgement, and expertise. In this paper, we combine peer-to-peer and collaborative systems to create Open2Edit, a peer-to-peer platform for collaboration.
BitTorrent is a peer-to-peer computer network protocol for sharing content in an efficient and scalable way. Modeling and analysis of the popular private BitTorrent communities has become an active area of research. In these communities users are strongly incentivized to contribute their resources, i.e., to share their files. In BitTorrent terminology, users who have finished downloading files and...
Tribler is an open-source software project facilitating searching, streaming and sharing content using P2P technology that has been used by over 800 000 people. The Tribler P2P core supports BitTorrent-compatible downloading, video on demand and live streaming. We continuously work on extensions and test out novel research ideas within our user base, resulting in sub-second content search, a reputation...
A considerable body of research shows that Bit-Torrent provides very efficient resource allocation inside single swarms. Many BitTorrent clients also allow users to participate in multiple swarms simultaneously, and implement inter-swarm resource-allocation mechanisms that are used by millions of people. However, resource allocation across multiple swarms in BitTorrent has received much less attention...
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