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14 May 2004 Fabrizio Coccetti - Centro Fermi1 CR4 – Ecole Polytechnique Fédérale de Lausanne (EPFL) ex-Université de Lausanne (UNIL) COevolution and Self-organization.

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Presentation on theme: "14 May 2004 Fabrizio Coccetti - Centro Fermi1 CR4 – Ecole Polytechnique Fédérale de Lausanne (EPFL) ex-Université de Lausanne (UNIL) COevolution and Self-organization."— Presentation transcript:

1 14 May 2004 Fabrizio Coccetti - Centro Fermi1 CR4 – Ecole Polytechnique Fédérale de Lausanne (EPFL) ex-Université de Lausanne (UNIL) COevolution and Self-organization In dynamical Networks COSIN Fabrizio Coccetti Centro Studi e Ricerche e Museo Storico della Fisica Enrico Fermi Fabrizio Coccetti Centro Studi e Ricerche e Museo Storico della Fisica Enrico Fermi Compendio Viminale – Via Panisperna Rome Database describing Complex Networks, Internet and WWW

2 14 May 2004 Fabrizio Coccetti - Centro Fermi2Agenda CR4 node presentation, funding and affiliation Overview of CR4 tasks and collaboration to other WPs The new COSIN Web Site Database of collected data (WWW and internet) CR4 contributions to other work packages

3 14 May 2004 Fabrizio Coccetti - Centro Fermi3 Paolo De Los Rios Assistant Prof. - Tenure Track Thomas Petermann Ph.D. Student (May due March 2005) David Gfeller 6 months visitor (February 2004 – July 2004) Claudio Valerio Diploma Student (due February 2005) Fabrizio Coccetti Researcher Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi – Roma CR4 - Structure

4 14 May 2004 Fabrizio Coccetti - Centro Fermi4 Since COSIN has been signed before January 1 st 2004, the source of funding is not the European Commission but the Swiss Confederation, through the Federal Office for Education and Science (OFES) under contract Due to internal Swiss delays, the 24 th month of COSIN corresponds actually to the 21 st month for CR4. Source of Founding

5 14 May 2004 Fabrizio Coccetti - Centro Fermi5 CR4 sits in the Institute of Theoretical Physics of the EPFL. On October 1st 2003 the whole Physics, Chemistry and Mathematics departments of the University of Lausanne have switched affiliation to the Ecole Polytechnique Federale de Lausanne (EPFL). This change of affiliation is the object of a forthcoming contract amendment within COSIN. COSIN accounts have been closed at UNIL on September 30th COSIN funds have been transferred from UNIL to EPFL on January 6 th There has been a three months gap filled somehow to pay for personnel (mainly loans from EPFL). Change of affiliation

6 14 May 2004 Fabrizio Coccetti - Centro Fermi6 D12 – Database describing complex networks, internet and www During the 2 nd year CR4 has also contributed to WP1: Mathematical Tools for Complex Systems WP4: Dynamics of social networks WP5: Models for communication networks CR4 Tasks Re-design of the COSIN Web Site

7 14 May 2004 Fabrizio Coccetti - Centro Fermi7 Re-designing the COSIN Web Site Coherent links from all the partner nodes Proper structure of the website

8 14 May 2004 Fabrizio Coccetti - Centro Fermi8 Contents !!!! Usable !!!! Keywords for profane surfers Specific links for specialists or people interested Nice look Keep it update Starting point to: reach all the nodes main results understand the project news

9 14 May 2004 Fabrizio Coccetti - Centro Fermi9 Work Packages point directly to Web Pages maintained by partner nodes

10 14 May 2004 Fabrizio Coccetti - Centro Fermi10 Remote pages have coherent structure and appearance

11 14 May 2004 Fabrizio Coccetti - Centro Fermi11 All the deliverables can be straightforward downloaded from the main site

12 14 May 2004 Fabrizio Coccetti - Centro Fermi12 Publications are organized on a per year base, most of them point to a PDF version. Still missing: Better check of the publications (duplicates) Improve the structure

13 14 May 2004 Fabrizio Coccetti - Centro Fermi13 D12 – Database of Collected Data The database is at the moment composed of various (but small amount of) data, some collected locally, some by other consortia. Internet World-Wide-Web Protein Networks Miscellaneous: Food Webs, Social Networks, U.S. patents, … Data available at

14 14 May 2004 Fabrizio Coccetti - Centro Fermi14 In 2001 the data collection community was already growing but still based on small efforts by few groups. It has developed, now, in large consortia dedicated to the task. Indeed, it has been proved (by CR4 and CR8: T. Petermann and P. De Los Rios, Exploration of Scale-Free Networks, Eur. Phys. J. B, in press (2004); A. Barrat et al. 2004, in preparation) that measurements from one or a few network nodes can indeed skew the data. The overlap of many different measurements is necessary to recover the correct network structure. This is beyond COSIN capabilities. The data acquisition problem

15 14 May 2004 Fabrizio Coccetti - Centro Fermi15Solutions Large consortia (CAIDA, LANRL) overcome these problems and are giving public access to their data. More generally the database will also develop into a collection of useful links. We will devote more efforts to context-oriented WWW data (see sets in the database), that have not yet attracted the great attention of the data-collection community. Collaboration with other consortia or institution

16 14 May 2004 Fabrizio Coccetti - Centro Fermi16 Possible collaboration PingER, BW to the World (SLAC) Gloperf (Globus Alliance) TTM (RIPE) AMP (NLANR) Skitter (CAIDA) Evergrow

17 14 May 2004 Fabrizio Coccetti - Centro Fermi17 World Wide Web Data We are collecting data using a robotic interface to Google (available to the public) and a Crawler (it will be available to the public, after we have published some results). The data in our database represent portion of the WWW where connected pages are related by the same words in their contents. We believe these data to be relevant to people interested in detecting cyber communities.

18 14 May 2004 Fabrizio Coccetti - Centro Fermi18 Obtain list of URL from google searching for a word (phrase) Check if the page contains the word (phrase) Count links Follow the links Repeat

19 14 May 2004 Fabrizio Coccetti - Centro Fermi19

20 14 May 2004 Fabrizio Coccetti - Centro Fermi20 1 level depth

21 14 May 2004 Fabrizio Coccetti - Centro Fermi21 Internet Data Some data have been collected locally by the traceroute command. Some data have been collected by a machine in Milan (GARR) using the PINGER engine.

22 14 May 2004 Fabrizio Coccetti - Centro Fermi22 Ping Data The PINGER engine was used to collect data from Milan (GARR) to the world Every 30 min, 11 ping packets, two sizes (100b and 1000b), you can estimate the Capacity of paths (variable packet size technique) One possible development: Merge the PINGER engine with a traceroute engine: weighted graphs

23 14 May 2004 Fabrizio Coccetti - Centro Fermi23 Variable Size Packets

24 14 May 2004 Fabrizio Coccetti - Centro Fermi24 PingER PingER PingER dimensions (beginning of 2004) 36 monitoring sites, 12 nazioni 822 remote sites, in 80 nazioni Collaboration for Pinger 2 (PERL module written by F.Coccetti) Needs database support Project born at SLAC (1995) by the IEPM (Internet End-to-end Performance Monitoring) group

25 14 May 2004 Fabrizio Coccetti - Centro Fermi25 IEPM-BW to the World Project born at SLAC (2001) (BABAR) Authors: C.Logg, L.Cottrell, J.Williams, M.Bhargava, F.Coccetti, I-Heng Mei, Maxim Grigoriev IEPM-BW dimensions (beginning of 2004) 7 monitoring networks SLAC, FNAL, NIKHEF, Internet2, Manchester UK, Univ.Michigan, INFN Mi

26 14 May 2004 Fabrizio Coccetti - Centro Fermi26 Protein Networks Protein-protein interaction networks are another domain where network tools are intensively used to detect relevant protein modules. The data in our database represent a small portion of the data at the Database for Interacting Proteins (DIP), which is the most complete and updated repository of protein interaction data, covering various different organisms. Data at DIP are free to download and use.

27 14 May 2004 Fabrizio Coccetti - Centro Fermi27 Miscellaneous Data Some more data are available in our database concerning Food Webs, Social Networks (actor collaboration network) Keep this section to display: - data collected to make COSIN publications - links to databases

28 14 May 2004 Fabrizio Coccetti - Centro Fermi28 CR4 contributions to other Work Packages (1) WP4: Dynamics of social networks Stimulated by the observation that the sizes of the folders of few uncorrelated people show the same statistical (algebraic) distribution, we have developed a model where social relations reinforce in time by establishing preferential exchange pairs of partners, giving a rationale for the observed distributions. G. Caldarelli, F. Coccetti and P. De Los Rios Preferential Exchange: Strengthening connection in complex networks Phys. Rev. E submitted.

29 14 May 2004 Fabrizio Coccetti - Centro Fermi29 CR4 contributions to other Work Packages (2) WP1: Mathematical Tools for Complex Systems We have developed new approximation schemes to better keep into account spatial and temporal correlation on regular lattices and networks, based on techniques borrowed from equilibrium statistical physics (such as the Cluster Variation Method) T. Petermann and P. De Los Rios Cluster approximations for epidemic processes: a systematic description of correlations beyond the pair level. Journal of Theoretical Biology, in press (2004) T. Petermann and P. De Los Rios Role of clustering and grid-like ordering in epidemic spreading Physical Review E, in press (2004)

30 14 May 2004 Fabrizio Coccetti - Centro Fermi30 CR4 contributions to other Work Packages (3) WP1: Mathematical Tools for Complex Systems (continue) We have rigorously shown that when applying a dichotomy-based method to identify communities and sub-communities in networks, just as in classifying species and sub-species in habitats (usual taxonomy), the method itself imposes an inverse square power-law behaviour for the community-size distribution G. Caldarelli, C. Caretta Cartozo, P. De Los Rios and V.D.P. Servedio The widespread occurrence of the inverse square-law distribution in social sciences and taxonomy Phys. Rev. E, (2004).

31 14 May 2004 Fabrizio Coccetti - Centro Fermi31 CR4 contributions to other Work Packages (4) WP5: Models for communication networks We have worked toward a better characterization of real networks, with special attention to the Internet, to develop models that are at the same time simple enough to be analytically tractable, but rich enough to take into account such important features such as intrinsic relevance of nodes and rewiring of the network links. G. Caldarelli, A. Capocci and P. De Los Rios Quantitative Description and Modeling of Real Networks Phys. Rev. E 68, (2003) G. Caldarelli, P. De Los Rios and L. Pietronero Generalized Network Growth: from Microscopic Strategies to the Real Internet Phys. Rev. E, submitted

32 14 May 2004 Fabrizio Coccetti - Centro Fermi32 D13 – Library of software tools We have collected and developed a number of software tools to analyze the Internet at AS and IP levels MRTGv6: a Linux (by now) Multi Router Traffic Grapher for IPv6 Hermes: a tool to visualize relationships between Internet Service Providers BGPlay: a Java applet for monitoring inter-AS routing instabilities Netkit: an open source virtual Networking lab Torque: a toolkit for investigating changes in the relationships between ASs NetML: an XML based language to interface with Netkit NetHunter: discovery and visualization of the Internet topology at IP level Tools available at with full documentation (thanks to CR2)www.dia.uniroma3.it/~cosin/Tools.htm


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