@article{smith97moon, title = {Topography of the Moon from the Clementine lidar }, author = {David E. Smith and Maria T. Zuber and Gregory A. Neumann and Frank G. Lemoine}, journal = {JOURNAL OF GEOPHYSICAL RESEARCH}, number = {E 1}, pages = {1591-1611}, volume = 102, year = 1997, abstract = {Range measurements from the lidar instrument carried aboard the Clementine spacecraft have been used to produce an accurate global topographic model of the Moon. This paper discusses the function of the lidar; the acquisition, processing, and filtering of observations to produce a global topographic model; and the determination of parameters that define the fundamental shape of the Moon. Our topographic model; a 72nd degree and order spherical harmonic expansion of lunar radii, is designated Goddard Lunar Topography Model 2 (GLTM 2). This topographic field has an absolute vertical accuracy of approximately 100 m and a spatial resolution of 2.5°. The field shows that the Moon can be described as a sphere with maximum positive and negative deviations of ∼8 km, both occurring on the farside, in the areas of the Korolev and South Pole-Aitken (S.P.-Aitken) basins. The amplitude spectrum of the topography shows more power at longer wavelengths as compared to previous models, owing to more complete sampling of the surface, particularly the farside. A comparison of elevations derived from the Clementine lidar to control point elevations from the Apollo laser altimeters indicates that measured relative topographic heights generally agree to within ∼200 m over the maria. While the major axis of the lunar gravity field is aligned in the Earth-Moon direction, the major axis of topography is displaced from this line by approximately 10° to the east and intersects the farside 24° north of the equator. The magnitude of impact basin topography is greater than the lunar flattening (∼2 km) and equatorial ellipticity (∼800 m), which imposes a significant challenge to interpreting the lunar figure. The floors of mare basins are shown to lie close to an equipotential surface, while the floors of unflooded large basins, except for S.P.-Aitken, lie above this equipotential. The radii of basin floors are thus consistent with a hydrostatic mechanism for the absence of significant farside maria except for S.P.-Aitken, whose depth and lack of mare require significant internal compositional and/or thermal heterogeneity. A macroscale surface roughness map shows that roughness at length scales of 101–102 km correlates with elevation and surface age. }, biburl = {http://www.bibsonomy.org/bibtex/2be0039c7526f0cf3f4c27e1b7733296d/andreab}, keywords = {lidar clementine imported topography moon} } @unpublished{fet07, title = {Infomation dynamics in web-based social systems}, author = {Vittorio Loreto and Ciro Cattuto and Andrea Baldassarri}, year = 2007, biburl = {http://www.bibsonomy.org/bibtex/25477948c69399262ef9dfa489191f48c/vittorio.loreto}, keywords = {workshop web cattuto social dynamics tagorapub paper systems information baldassarri position loreto fet 2007} } @incollection{sleb07, title = {Complex systems approach to the emergence of language}, author = {A. Baronchelli and C. Cattuto and V. Loreto and A. Puglisi}, booktitle = {Language, Evolution and the Brain}, editor = {J. W. Minett & W. S-Y. Wang}, year = 2007, biburl = {http://www.bibsonomy.org/bibtex/2b5f5ffae5b1a52c77345881215824131/vittorio.loreto}, keywords = {complex baronchelli emergence 2007 tagorapub systems cattuto language sleb minett puglisi wang loreto} } @article{heymann2007spam, title = {Fighting Spam on Social Web Sites: A Survey of Approaches and Future Challenges}, address = {Piscataway, NJ, USA}, author = {Paul Heymann and Georgia Koutrika and Hector Garcia-Molina}, journal = {IEEE Internet Computing}, number = 6, pages = {36--45}, publisher = {IEEE Educational Activities Department}, volume = 11, year = 2007, url = {http://portal.acm.org/citation.cfm?id=1304062.1304547&coll=GUIDE&dl=}, issn = {1089-7801}, doi = {http://dx.doi.org/10.1109/MIC.2007.125}, description = {Fighting Spam on Social Web Sites}, abstract = {In recent years, social Web sites have become important components of the Web. With their success, however, has come an increasing flux of spam. If left unchecked, spam threatens to undermine resource sharing, interactivity, and openness. The authors survey three categories of potential countermeasures: those based on detection, demotion, and prevention. Although many of these countermeasures have been proposed before for email and Web spam, the authors find that their applicability to social Web sites differs. How should we evaluate spam countermeasures for social Web sites, and what future challenges might we face?}, biburl = {http://www.bibsonomy.org/bibtex/23e0a8be9fb6fff102e6aed13d1db22f7/andreab}, keywords = {spam heymann web folksonomy 2007 social} } @article{cfl2007, title = {Statistical physics of social dynamics}, author = {Claudio Castellano and Santo Fortunato and Vittorio Loreto}, journal = {Reviews of Modern Physics}, number = {xxx}, pages = {xxx}, volume = {xx}, year = 2008, url = {http://arxiv.org/abs/0710.3256}, id = {1785135}, priority = {2}, eprint = {0710.3256}, abstract = {Statistical physics has proven to be a very fruitful framework to describe phenomena outside the realm of traditional physics. The last years have witnessed the attempt by physicists to study collective phenomena emerging from the interactions of individuals as elementary units in social structures. Here we review the state of the art by focusing on three major research lines i.e., opinion, cultural and language dynamics. In addition we discuss other social phenomena, such as crowd behavior, hierarchy formation, human dynamics, social spreading. We highlight the connections between these problems and other, more traditional, topics of statistical physics. We also emphasize the comparison of model results with empirical data from social systems.}, biburl = {http://www.bibsonomy.org/bibtex/21c119ca0fedd785c3563c421599d487f/vittorio.loreto}, keywords = {dynamics RMP_CFL tagorapub language castellano crowd social loreto fortunato opinion culture 2007 physics} } @book{heaps78, title = {Information Retrieval: Computational and Theoretical Aspects}, address = {Orlando, FL, USA}, author = {H. S. Heaps}, publisher = {Academic Press, Inc.}, year = 1978, isbn = {0123357500}, biburl = {http://www.bibsonomy.org/bibtex/2cc39f6a45134020d97fe0fdce7793691/vittorio.loreto}, keywords = {retrieval heaps 1978 growth information vocabulary} } @unpublished{cbbsl08, title = {The collective dynamics of social annotation}, author = {C. Cattuto and A. Barrat and A. Baldassarri and G. Schehr and V. Loreto}, year = 2008, biburl = {http://www.bibsonomy.org/bibtex/28e7d664e29056208e6818a22dcc0e7da/vittorio.loreto}, keywords = {cooccurrence network growth social baldassarri 2008 loreto sublinear tagorapub schehr annotation cattuto barrat} } @article{petri_stochastic, title = {Stochastic dynamics of a sheared granular medium}, author = {A. Petri and A. Baldassarri and F. Dalton and G. Pontuale and L. Pietronero and S. Zapperi}, journal = {The European Physical Journal B - Condensed Matter and Complex Systems}, year = 2008, url = {http://dx.doi.org/10.1140/epjb/e2008-00177-x}, doi = {10.1140/epjb/e2008-00177-x}, abstract = {Abstract. We experimentally investigate the response of a sheared granular medium in a Couette geometry. The apparatus exhibits the expected stick-slip motion and we probe it in the very intermittent regime resulting from low driving. Statistical analysis of the dynamic fluctuations reveals notable regularities. We observe a possible stability property for the torque distribution, reminiscent of the stability of Gaussian independent variables. In this case, however, the variables are correlated and the distribution is skewed. Moreover, the whole dynamical intermittent regime can be described with a simple stochastic model, finding good quantitative agreement with the experimental data. Interestingly, a similar model has been previously introduced in the study of magnetic domain wall motion, a source of Barkhausen noise. Our study suggests interesting connections between different complex phenomena and reveals some unexpected features that remain to be explained. }, biburl = {http://www.bibsonomy.org/bibtex/2269860703e31dd83cdb44e6a0d22d30b/andreab}, keywords = {stress imported friction extreme myown distribution granular 2008 universality proceeding statphys} } @article{gonzalez08, title = {Understanding individual human mobility patterns}, author = {Marta C. Gonzalez and Cesar A. Hidalgo and Albert-Laszlo Barabasi}, journal = {Nature}, month = {June}, number = 7196, pages = {779--782}, publisher = {Nature Publishing Group}, volume = 453, year = 2008, priority = {1}, at = {2008-06-10 17:58:36}, doi = {10.1038/nature06958}, biburl = {http://www.bibsonomy.org/bibtex/2a46fe848af7d562799996ea9e01951be/vittorio.loreto}, keywords = {hidalgo RMP_CFL human gonzalez dynamics 2008 behavior barabasi mobility} } @misc{kleinberg02, title = {Bursty and hierarchical structure in streams}, author = {J. Kleinberg}, year = 2002, biburl = {http://www.bibsonomy.org/bibtex/2ff9fff63470094c7bae11b1bd4e9edcc/vittorio.loreto}, keywords = {kleinberg 2002 hierarchical bursty streams RMP_CFL burstiness} } @incollection{carnap39, title = {Foundations of Logic and Mathematics}, author = {Rudolf Carnap}, editor = {Otto Neurath}, publisher = {The University of Chicago Press}, series = {International Encyclopedia of Unified Science}, year = 1939, biburl = {http://www.bibsonomy.org/bibtex/2740087a9fe9510787472b83a0627ef02/vittorio.loreto}, keywords = {1939 logic foundations mathematics carnap} } @book{russell25, title = {Principia Mathematica}, author = {Alfred North Whitehead and Bertrand Russell}, publisher = {Cambridge University Press}, year = {1925--1927}, biburl = {http://www.bibsonomy.org/bibtex/28bc03526df383296e020ad564895db6d/vittorio.loreto}, keywords = {russell 1925 principia empirism mathematica whitehead logic 1927} } @book{sowa84, title = {Conceptual structures: information processing in mind and machine}, address = {Boston, MA, USA}, author = {J. F. Sowa}, publisher = {Addison-Wesley Longman Publishing Co., Inc.}, year = 1984, isbn = {0-201-14472-7}, biburl = {http://www.bibsonomy.org/bibtex/21fdc48e06d28fd9052a55d34802965ce/vittorio.loreto}, keywords = {semantic information networks conceptual sowa 1984} } @article{metropolis53, title = {Equation of State Calculations by Fast Computing Machines }, author = {N. Metropolis and A. Rosenbluth and M. Rosenbluth and A. Teller and E. Teller}, journal = {J. Chem. Phys.}, pages = 1087, volume = 21, year = 1953, biburl = {http://www.bibsonomy.org/bibtex/2696c7dfcbed67f0382ed02aa803817da/vittorio.loreto}, keywords = {teller montecarlo RMP_CFL metropolis rosenbluth 1953} } @article{alder59, title = {Studies in Molecular Dynamics. I. General Method }, author = {B. J. Alder and T. E. Wainwright}, journal = {J. Chem. Phys.}, pages = 459, volume = 31, year = 1959, biburl = {http://www.bibsonomy.org/bibtex/2f86aaa4d47bf12650e20e8e896163dd9/vittorio.loreto}, keywords = {1959 wainwright RMP_CFL dynamics alder molecular} } @article{alder57, title = {Phase Transition for a Hard Sphere System}, author = {B. J. Alder and T. E. Wainwright}, journal = {J. Chem. Phys.}, pages = 1208, volume = 27, year = 1957, biburl = {http://www.bibsonomy.org/bibtex/2ffbe98214d65384d5746c618a0765f5e/vittorio.loreto}, keywords = {hard wainwright dynamics alder RMP_CFL molecular 1957 sphere} } @article{boccaletti06, title = {Complex networks: Structure and dynamics}, author = {S. Boccaletti and V. Latora and Y. Moreno and M. Chavez and D. U. Hwang}, journal = {Physics Reports}, month = {February}, number = {4-5}, pages = {175--308}, volume = 424, year = 2006, url = {http://dx.doi.org/10.1016/j.physrep.2005.10.009}, id = {481248}, priority = {2}, at = {2006-05-19 01:53:27}, doi = {10.1016/j.physrep.2005.10.009}, abstract = {Coupled biological and chemical systems, neural networks, social interacting species, the Internet and the World Wide Web, are only a few examples of systems composed by a large number of highly interconnected dynamical units. The first approach to capture the global properties of such systems is to model them as graphs whose nodes represent the dynamical units, and whose links stand for the interactions between them. On the one hand, scientists have to cope with structural issues, such as characterizing the topology of a complex wiring architecture, revealing the unifying principles that are at the basis of real networks, and developing models to mimic the growth of a network and reproduce its structural properties. On the other hand, many relevant questions arise when studying complex networks' dynamics, such as learning how a large ensemble of dynamical systems that interact through a complex wiring topology can behave collectively. We review the major concepts and results recently achieved in the study of the structure and dynamics of complex networks, and summarize the relevant applications of these ideas in many different disciplines, ranging from nonlinear science to biology, from statistical mechanics to medicine and engineering.}, biburl = {http://www.bibsonomy.org/bibtex/2d2d05ad735350f2374e8e32b1be98e47/vittorio.loreto}, keywords = {RMP_CFL latora chavez 2006 networks complex structure dynamics boccaletti moreno hwang} } @misc{crane-2008, title = {Robust dynamic classes revealed by measuring the response function of a social system}, author = {R. Crane and D. Sornette}, year = 2008, url = {http://www.citebase.org/abstract?id=oai:arXiv.org:0803.2189}, description = {[0803.2189v1] Robust dynamic classes revealed by measuring the response function of a social system}, abstract = { We study the relaxation response of a social system after endogenous and exogenous bursts of activity using the time-series of daily views for nearly 5 million videos on YouTube. We find that most activity can be described accurately as a Poisson process. However, we also find hundreds of thousands of examples in which a burst of activity is followed by an ubiquitous power-law relaxation governing the timing of views. We find that these relaxation exponents cluster into three distinct classes, and allow for the classification of collective human dynamics. This is consistent with an epidemic model on a social network containing two ingredients: A power law distribution of waiting times between cause and action and an epidemic cascade of actions becoming the cause of future actions. This model is a conceptual extension of the fluctuation-dissipation theorem to social systems, and provides a unique framework for the investigation of timing in complex systems.}, biburl = {http://www.bibsonomy.org/bibtex/2bb04260be64a4d856319719cb688f5dc/andreab}, keywords = {youtube social fdt dynamics imported video} } @article{simkin08, title = {A theory of web traffic}, author = {M. V. Simkin and V. P. Roychowdhury}, journal = {Europhys. Lett.}, pages = 28006, volume = 82, year = 2008, biburl = {http://www.bibsonomy.org/bibtex/218e5bd67d7dbc48a051f3373afc5bb6b/vittorio.loreto}, keywords = {simkin 2008} } @article{sneppen95, title = {Evolution as a Self-Organized Critical Phenomenon }, author = {K. Sneppen and P. Bak and H. Flyvbjerg M. H. Jensen}, journal = {Proc. Natl. Acad. Sci. USA}, pages = {5209-5213}, volume = 92, year = 1995, biburl = {http://www.bibsonomy.org/bibtex/23c590cc65acb89e2bc031b863d5954d9/vittorio.loreto}, keywords = {95 sneppen} }