147 research outputs found
The Stength of Weak cooperation: A Case Study on Flickr
Web 2.0 works with the principle of weak cooperation, where a huge amount of
individual contributions build solid and structured sources of data. In this
paper, we detail the main properties of this weak cooperation by illustrating
them on the photo publication website Flickr, showing the variety of uses
producing a rich content and the various procedures devised by Flickr users
themselves to select quality. We underlined the interaction between small and
heavy users as a specific form of collective production in large social
networks communities. We also give the main statistics on the (5M-users,
150M-photos) data basis we worked on for this study, collected from Flickr
website using the public API
From Historical Documents To Social Network Visualization: Potential Pitfalls and Network Modeling
International audienceWe describe the workflow followed by historians when conducting a Historical Social Network Analysis (HSNA) with five steps: textual sources acquisition, digitization, annotation, network creation, and analysis/visualization. While most analysis and visualization tools only support the last step, we argue that addressing the 2-3 last steps would boost the humanists' analytical capabilities. We explain why the network modeling process is particularly challenging and can lead to distortions of the sources, biases, and traceability problems. We list three main properties that we believe the constructed network should satisfy: alignment with reality/documents (not only with concepts), traceability (from documents to analysis/visualization and back), and simplicity (understandable by most and not more complex than needed). We claim that the model of bipartite dynamic multivariate network with roles allows an effective annotation/encoding of historical sources while satisfying these properties. We provide real-world examples of how this model has been used to answer socio-historical questions using visual analytics tools
CRH-LaDĂ©HiS â Laboratoire de dĂ©mographie et dâhistoire sociale
Pascal Cristofoli, ingĂ©nieur dâĂ©tudesArnaud BringĂ©, ingĂ©nieur de recherche Ă lâINEDBĂ©nĂ©dicte Garnier, ingĂ©nieure dâĂ©tudes Ă lâINED Atelier « Analyse des donnĂ©es relationnelles » Lieu dâenseignement, de discussion et de collaboration entre Ă©tudiants, ingĂ©nieurs et chercheurs associĂ©s, lâatelier vise Ă interroger les diffĂ©rentes opĂ©rations pratiques et thĂ©oriques impliquĂ©es par la mise en Ćuvre dâanalyses relationnelles. Depuis plusieurs annĂ©es maintenant, le sĂ©minaire est organisĂ© en trois jou..
CRH-LaDĂ©HiS â Laboratoire de dĂ©mographie et dâhistoire sociale
Pascal Cristofoli, ingĂ©nieur dâĂ©tudesArnaud BringĂ©, ingĂ©nieur de recherche Ă lâINEDBĂ©nĂ©dicte Garnier, ingĂ©nieure dâĂ©tudes Ă lâINED Atelier « Analyse des donnĂ©es relationnelles » Lieu dâenseignement, de discussion et de collaboration entre Ă©tudiants, ingĂ©nieurs et chercheurs associĂ©s, lâatelier vise Ă interroger les diffĂ©rentes opĂ©rations pratiques et thĂ©oriques impliquĂ©es par la mise en Ćuvre dâanalyses relationnelles. Depuis plusieurs annĂ©es maintenant, le sĂ©minaire est organisĂ© en trois jou..
CRH â Laboratoire de dĂ©mographie et dâhistoire sociale (LaDĂ©HiS)
Pascal Cristofoli, ingĂ©nieur dâĂ©tudesFlorence Maillochon, chargĂ©e de recherche au CNRSZacarias Moutoukias, professeur Ă lâUniversitĂ© Paris-VII/DiderotChristophe Prieur, maĂźtre de confĂ©rences Ă lâUniversitĂ© Paris-VII/DiderotMarie-Carmen Smyrnelis, ingĂ©nieur de recherche Approches des rĂ©seaux sociaux Depuis plusieurs annĂ©es, le sĂ©minaire se propose dâaborder, de façon interdisciplinaire, les diffĂ©rentes approches pratiques et thĂ©oriques impliquĂ©es lors de la mise en Ćuvre dâanalyses relationnel..
CRH â Laboratoire de dĂ©mographie et dâhistoire sociale (LaDĂ©HiS)
Pascal Cristofoli, ingĂ©nieur dâĂ©tudesFlorence Maillochon, chargĂ©e de recherche au CNRSZacarias Moutoukias, professeur Ă lâUniversitĂ© Paris-VII/DiderotChristophe Prieur, maĂźtre de confĂ©rences Ă lâUniversitĂ© Paris-VII/DiderotMarie-Carmen Smyrnelis, ingĂ©nieur de recherche Approches des rĂ©seaux sociaux Depuis plusieurs annĂ©es, le sĂ©minaire se propose dâaborder, de façon interdisciplinaire, les diffĂ©rentes approches pratiques et thĂ©oriques impliquĂ©es lors de la mise en Ćuvre dâanalyses relationnel..
CRH â Laboratoire de dĂ©mographie historique (LDH)
StĂ©phane Baciocchi, Pascal Cristofoli, ingĂ©nieurs dâĂ©tudesFlorence Maillochon, chargĂ©e de recherche au CNRSZacarias Moutoukias, professeur Ă lâUniversitĂ© Paris-VII/DiderotChristophe Prieur, maĂźtre de confĂ©rences Ă lâUniversitĂ© Paris-VII/DiderotMarie-Carmen Smyrnelis Approches des rĂ©seaux sociaux Ce sĂ©minaire se propose dâaborder, avec une posture interdisciplinaire, les diffĂ©rentes approches pratiques et thĂ©oriques impliquĂ©es lors de la mise en oeuvre dâanalyses relationnelles. Il sâest organ..
MICROSCOPE mission analysis, requirements and expected performance
The MICROSCOPE mission aimed to test the Weak Equivalence Principle (WEP) to
a precision of . The WEP states that two bodies fall at the same rate
on a gravitational field independently of their mass or composition. In
MICROSCOPE, two masses of different compositions (titanium and platinum alloys)
are placed on a quasi-circular trajectory around the Earth. They are the
test-masses of a double accelerometer. The measurement of their accelerations
is used to extract a potential WEP violation that would occur at a frequency
defined by the motion and attitude of the satellite around the Earth. This
paper details the major drivers of the mission leading to the specification of
the major subsystems (satellite, ground segment, instrument, orbit...).
Building upon the measurement equation, we derive the objective of the test in
statistical and systematic error allocation and provide the mission's expected
error budget.Comment: References update
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