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9 papers · 1 filter
Yahtzee: An Anonymized Group Level Matching Procedure
Jason J. Jones, Robert M. Bond, Christopher J. Fariss +4
Researchers often face the problem of needing to protect the privacy of subjects while also needing to integrate data that contains personal information from diverse data sources i…
The Anatomy of the Facebook Social Graph
Johan Ugander, Brian Karrer, Lars Backstrom +1
We study the structure of the social graph of active Facebook users, the largest social network ever analyzed. We compute numerous features of the graph including the number of use…
Determining a rotation of a tetrahedron from a projection
Richard J. Gardner, Paolo Gronchi, Thorsten Theobald
The following problem, arising from medical imaging, is addressed: Suppose that is a known tetrahedron in with centroid at the origin. Also known is the orthogonal proje…
Four Degrees of Separation
Lars Backstrom, Paolo Boldi, Marco Rosa +2
Frigyes Karinthy, in his 1929 short story "Láancszemek" ("Chains") suggested that any two persons are distanced by at most six friendship links. (The exact wording of the story is…
HIP 38939B: A New Benchmark T Dwarf in the Galactic Plane Discovered with Pan-STARRS1
Niall R. Deacon, Michael C. Liu, Eugene A. Magnier +13
We report the discovery of a wide brown dwarf companion to the mildly metal-poor ([Fe/H]=-0.24), low galactic latitude (b = 1.88 deg) K4V star HIP 38939. The companion was discover…
Four new T dwarfs identified in PanSTARRS 1 commissioning data
Niall R. Deacon, Michael C. Liu, Eugene A. Magnier +14
A complete well-defined sample of ultracool dwarfs is one of the key science programs of the Pan-STARRS 1 optical survey telescope (PS1). Here we combine PS1 commissioning data wit…