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Documents authored by Hoßfeld, Tobias

Document
DOI: 10.4230/DagRep.5.11.103
Crowdsourcing and Human-Centred Experiments (Dagstuhl Seminar 15481)

Authors: Daniel Archambault, Tobias Hoßfeld, and Helen C. Purchase

Published in: Dagstuhl Reports, Volume 5, Issue 11 (2016)

Abstract
This report documents the program and the outcomes of Dagstuhl Seminar 15481 "Evaluation in the Crowd: Crowdsourcing and Human-Centred Experiments". Human-centred empirical evaluations play important roles in the fields of human-computer interaction, visualization, graphics, multimedia, and psychology. The advent of crowdsourcing platforms, such as Amazon Mechanical Turk or Microworkers, has provided a revolutionary methodology to conduct human-centred experiments. Through such platforms, experiments can now collect data from hundreds, even thousands, of participants from a diverse user community over a matter of weeks, greatly increasing the ease with which we can collect data as well as the power and generalizability of experimental results. However, such an experimental platform does not come without its problems: ensuring participant investment in the task, defining experimental controls, and understanding the ethics behind deploying such experiments en-masse. The major interests of the seminar participants were focused in different working groups on (W1) Crowdsourcing Technology, (W2) Crowdsourcing Community, (W3) Crowdsourcing vs. Lab, (W4) Crowdsourcing & Visualization, (W5) Crowdsourcing & Psychology, (W6) Crowdsourcing & QoE Assessment.
Cite as

Daniel Archambault, Tobias Hoßfeld, and Helen C. Purchase. Crowdsourcing and Human-Centred Experiments (Dagstuhl Seminar 15481). In Dagstuhl Reports, Volume 5, Issue 11, pp. 103-126, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@Article{archambault_et_al:DagRep.5.11.103,
  author =	{Archambault, Daniel and Ho{\ss}feld, Tobias and Purchase, Helen C.},
  title =	{{Crowdsourcing and Human-Centred Experiments (Dagstuhl Seminar 15481)}},
  pages =	{103--126},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2016},
  volume =	{5},
  number =	{11},
  editor =	{Archambault, Daniel and Ho{\ss}feld, Tobias and Purchase, Helen C.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.5.11.103},
  URN =		{urn:nbn:de:0030-drops-57676},
  doi =		{10.4230/DagRep.5.11.103},
  annote =	{Keywords: Crowdsourcing; Human Computation; Crowdsourcing Design, Mechanisms, Engineering; Practical Experience; Computer Graphics; Applied Perception; HCI; Visualization}
}
Document
DOI: 10.4230/DagRep.3.9.1
Crowdsourcing: From Theory to Practice and Long-Term Perspectives (Dagstuhl Seminar 13361)

Authors: Tobias Hoßfeld, Phuoc Tran-Gia, and Maja Vucovic

Published in: Dagstuhl Reports, Volume 3, Issue 9 (2014)

Abstract
This report documents the program and the outcomes of Dagstuhl Seminar 13361 "Crowdsourcing: From Theory to Practice and Long-Term Perspectives". Crowdsourcing is a newly emerging service platform and business model in the Internet. In contrast to outsourcing, where a job is performed by a designated worker or employee, crowdsourcing means to outsource a job to a large, anonymous crowd of workers, the so-called human cloud, in the form of an open call. Current research in crowdsourcing addresses the following issues: crowdsourcing as a novel methodology for user-centered research; development of new services and applications based on human sensing, computation, and problem solving; engineering of improved crowdsourcing platforms including quality control mechanisms; incentive design and gamification of work; usage of crowdsourcing for professional business; theoretical frameworks for evaluation. The topic on crowdsourcing may have a huge impact on the Internet and its technical infrastructure, on society, and the future of work. In short, crowdsourcing will be a guiding paradigm and form the evolution of work in the next years. Therefore, this seminar helps coordinating research efforts in the different communities. In five presentation and discussion sessions, the diverse aspects of crowdsourcing were elaborated. The topics of the sessions covered (S1) crowdsourcing in general, (S2) industry use cases, (S3) crowdsourcing design and engineering, (S4) programming and implementing crowdsourcing, (S5) applications of crowdsourcing. The major interests of the seminar participants were then focused in four different working groups on (W1) long-term perspectives & impact on economics in five years, (W2) theory -- taxonomy and dimensions of crowdsourcing, (W3) industry use cases, (W4) crowdsourcing mechanisms and design. In parallel to this seminar, a topically related seminar on "Cloud-based Software Crowdsouring", organized by Michael N. Huhns, Wei Li, Martin Schader and Wei-Tek Tsal,(Dagstuhl Seminar 13362) took place. Therefore, a joint late night session was organized to discuss crowdsourcing with respect to ethics and its relation to social computation.
Cite as

Tobias Hoßfeld, Phuoc Tran-Gia, and Maja Vucovic. Crowdsourcing: From Theory to Practice and Long-Term Perspectives (Dagstuhl Seminar 13361). In Dagstuhl Reports, Volume 3, Issue 9, pp. 1-33, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2013)

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@Article{hofeld_et_al:DagRep.3.9.1,
  author =	{Ho{\ss}feld, Tobias and Tran-Gia, Phuoc and Vucovic, Maja},
  title =	{{Crowdsourcing: From Theory to Practice and Long-Term Perspectives (Dagstuhl Seminar 13361)}},
  pages =	{1--33},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2013},
  volume =	{3},
  number =	{9},
  editor =	{Ho{\ss}feld, Tobias and Tran-Gia, Phuoc and Vucovic, Maja},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.3.9.1},
  URN =		{urn:nbn:de:0030-drops-43545},
  doi =		{10.4230/DagRep.3.9.1},
  annote =	{Keywords: Crowdsourcing, Human Computation, Human Cloud, Applications, Industry Use Cases, Crowdsourcing Design, Mechanisms, Engineering, Practical Experience}
}
Document
DOI: 10.4230/DagSemProc.04411.20
Simulative Performance Evaluation of a Mobile Peer-to-Peer File-Sharing System

Authors: Kurt Tutschku, Tobias Hoßfeld, Hermann de Meer, Jens Oberender, and Frank-Uwe Andersen

Published in: Dagstuhl Seminar Proceedings, Volume 4411, Service Management and Self-Organization in IP-based Networks (2005)

Abstract
Peer-to-Peer (P2P) file-sharing has become the killer application in the wired Internet and might also be highly attractive for mobile networks. In particular since UMTS operators are searching for new applications which do both: a) exploit the potential of the UMTS technology and b) motivate the user to adopt the new technology. In this work we are investigating the performance of an eDonkey-based mobile P2P file-sharing system by means of time-dynamic simulation. Mobile networks differ from wireline networks by the limited capacity of the radio link and the mobility of the users. P2P networks, in contrast, are overlays which consider the transport network in an abstract way. In a mobile environment, the question arises, whether the abstraction can be maintained and what will be the performance impact if there is any. We will show in detail how the mobile access technology (GPRS or UMTS), the churn behavior of mobile users, the file size of mobile specific content, and special infrastructure entities, such as a cache peer, influences the performance of the suggested mobile P2P file-sharing service.
Cite as

Kurt Tutschku, Tobias Hoßfeld, Hermann de Meer, Jens Oberender, and Frank-Uwe Andersen. Simulative Performance Evaluation of a Mobile Peer-to-Peer File-Sharing System. In Service Management and Self-Organization in IP-based Networks. Dagstuhl Seminar Proceedings, Volume 4411, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2005)

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@InProceedings{tutschku_et_al:DagSemProc.04411.20,
  author =	{Tutschku, Kurt and Ho{\ss}feld, Tobias and Meer, Hermann de and Oberender, Jens and Andersen, Frank-Uwe},
  title =	{{Simulative Performance Evaluation of a Mobile Peer-to-Peer File-Sharing System}},
  booktitle =	{Service Management and Self-Organization in IP-based Networks},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4411},
  editor =	{Matthias Bossardt and Georg Carle and D. Hutchison and Hermann de Meer and Bernhard Plattner},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04411.20},
  URN =		{urn:nbn:de:0030-drops-999},
  doi =		{10.4230/DagSemProc.04411.20},
  annote =	{Keywords: peer-to-peer , UMTS , performance evaluation , file-sharing}
}
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