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Jia, L. (author), Shen, S. (author), van de Bovenkamp, R. (author), Iosup, A. (author), Kuipers, F.A. (author), Epema, D.H.J. (author)
Multiplayer Online Games (MOGs) like Defense of the Ancients and StarCraft II have attracted hundreds of millions of users who communicate, interact, and socialize with each other through gaming. In MOGs, rich social relationships emerge and can be used to improve gaming services such as match recommendation and game population retention, which...
journal article 2015
document
Capota, M. (author), Pouwelse, J.A. (author), Epema, D.H.J. (author)
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...
conference paper 2015
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Shen, S. (author), Iosup, A. (author), Israel, Assaf (author), Cirne, Walfredo (author), Raz, Danny (author), Epema, D.H.J. (author)
Data enters are at the core of a wide variety of daily ICT utilities, ranging from scientific computing to online gaming. Due to the scale of today's data enters, the failure of computing resources is a common occurrence that may disrupt the availability of ICT services, leading to revenue loss. Although many high availability (HA) techniques...
conference paper 2015
document
Shen, S. (author), Iosup, A. (author), Epema, D.H.J. (author), Hu, Shun-Yun (author)
Although Multi-Avatar Distributed Virtual Environments (MAVEs) such as Real-Time Strategy (RTS) games entertain daily hundreds of millions of online players, their current designs do not scale. For example, even popular RTS games such as the StarCraft series support in a single game instance only up to 16 players and only a few hundreds of...
journal article 2015
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Jia, L. (author), Schoon, P.B. (author), Pouwelse, J.A. (author), Epema, D.H.J. (author)
User interactions are indispensable for any online network to thrive, especially for BitTorrent‐like and Web real‐time communication‐based distributed online networks that rely on users' collective contributions instead of the help of central servers. User interactions provide fine‐grained information for many applications, such as security...
journal article 2015
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Gkorou, D. (author), Pouwelse, J.A. (author), Epema, D.H.J. (author)
Distributed reputation systems establish trust among strangers in online communities and provide incentives for users to contribute. In these systems, each user monitors the interactions of others and computes the reputations accordingly. Collecting information for computing the reputations is challenging for the users due to their vulnerability...
conference paper 2015
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Ilyushkin, A.S. (author), Epema, D.H.J. (author)
Many fields of modern science require huge amounts of computation, and workflows are a very popular tool in e-Science since they allow to organize many small, simple tasks to solve big problems. They are used in astronomy, bioinformatics, machine learning, social network analysis, physics, and many other branches of science. Workflows are...
conference paper 2015
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Ilyushkin, A.S. (author), Ghit, B.I. (author), Epema, D.H.J. (author)
Workflows are important computational tools in many branches of science, and because of the dependencies among their tasks and their widely different characteristics, scheduling them is a difficult problem. Most research on scheduling workflows has focused on the offline problem of minimizing the makespan of single workflows with known task...
conference paper 2015
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Ghit, B.I. (author), Capota, M. (author), Hegeman, T.M. (author), Hidders, A.J.H. (author), Epema, D.H.J. (author), Iosup, A. (author)
conference paper 2014
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Jia, L. (author), Chen, X (author), Chu, X (author), Pouwelse, J.A. (author), Epema, D.H.J. (author)
Many private BitTorrent communities employ Sharing Ratio Enforcement<br/>(SRE) schemes to incentivize users to contribute. It has been demonstrated<br/>that users in private communities are highly dedicated and that they seed much<br/>longer than users in communities where SRE is not employed. While most pre-<br/>vious studies focus on showing...
journal article 2014
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Jia, L. (author), Rahman, R (author), Vinko, T. (author), Pouwelse, J.A. (author), Epema, D.H.J. (author)
Many peer-to-peer communities, including private BitTorrent Communities that serve hundreds of thousands of users, utilize<br/>credit-based or sharing ratio enforcement schemes to incentivize their members to contribute. In this paper, we analyze the performance<br/>of such communities from both the system-level and the user-level perspectives....
journal article 2013
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Epema, H.K. (author), Van den Brand, S. (author), Gregoor, W. (author), Kooijman, J.D.G. (author), Pereboom, H.P. (author), Wielemaker, D.C. (author), Van der Zweep, C.J. (author)
The current International Human Powered Vehicle Association world records for faired bicycles stand at 133.284km/h for the 200m flying start speed record and 91.562 km for the hour record. Traditionally the recumbent bicycles that have been developed for breaking one of either of these records have been optimized around a specific, relatively...
journal article 2012
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Epema, D. (author)
This report presents a combination of two new medical instruments which can be used to treat Cystic Echinococcosis safely and without spilling hydatid cyst content.
master thesis 2011
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Jia, L. (author), d' Acunto, L. (author), Meulpolder, M. (author), Pouwelse, J.A. (author), Epema, D.H.J. (author)
Enhancing reciprocity has been one of the primary motivations for the design of incentive policies in BitTorrent-like P2P systems. Reciprocity implies that peers need to contribute their bandwidth to other peers if they want to receive bandwidth in return. However, the over-provisioning that characterizes today’s BitTorrent communities and the...
conference paper 2011
document
Jia, L. (author), Rahman, R (author), Vinko, T. (author), Pouwelse, J.A. (author), Epema, D.H.J. (author)
Many private BitTorrent communities employ Sharing Ratio Enforcement (SRE) schemes to incentivize users to contribute their upload resources. It has been demonstrated that communities that use SRE are greatly oversupplied, i.e., they have much higher seeder-to-leecher ratios than communities in which SRE is not employed. The first order effect...
conference paper 2011
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Mol, J.J.D. (author), Pouwelse, J.A. (author), Meulpolder, M. (author), Epema, D.H.J. (author), Sips, H.J. (author)
Centralised solutions for Video-on-Demand (VoD) services, which stream pre-recorded video content to multiple clients who start watching at the moments of their own choosing, are not scalable because of the high bandwidth requirements of the central video servers. Peer-to-peer (P2P) techniques which let the clients distribute the video content...
conference paper 2008
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Pouwelse, J.A. (author), Garbacki, P. (author), Epema, D.H.J. (author), Sips, H.J. (author)
journal article 2008
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Meulpolder, M. (author), Pouwelse, J.A. (author), Epema, D.H.J. (author), Sips, H.J. (author)
<br/>Peer-to-peer (p2p ) file sharing systems rely on the sharing of resources by large fractions of partic- ipants. Sharing-ratio enforcement provides a very strong incentive for peers to contribute, leading to a higher performance for all peers in the system. One way of implementing this is by banning peers that do not share enough, determined...
report 2008
document
Iosup, A. (author), Epema, D. (author)
The Grid promise is starting to materialize today: largescale multi-site infrastructures have grown to assist the work of scientists from all around the world. This tremendous growth can be sustained and continued only through a higher quality of the middleware, in terms of deployability and of correct functionality. A potential solution to this...
conference paper 2007
document
Garbacki, P. (author), Epema, D.H.J. (author), Van Steen, M. (author)
conference paper 2007
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