instance_of codeen
David Ethan Culler ( born ___MASK23___ 12 , 1959 ) is a computer scientist and former ___MASK74___ of the ___MASK16___ of Electrical Engineering and Computer Sciences at the University of California , Berkeley . He is a ___MASK75___ Investigator in the ___MASK76___ Defined Buildings ( SDB ) project at the EECS ___MASK16___ at Berkeley and the Faculty Director of the i4Energy Center . His research addresses networks of small , embedded wireless devices , planetary - scale internet services , parallel computer architecture , parallel programming languages , and high performance communication . This includes TinyOS , Berkeley Motes , PlanetLab , Networks of Workstations ( NOW ), Internet services , Active Message , Split - C , and the Threaded Abstract Machine ( TAM ). A ___MASK52___ or data network is a telecommunications network which allows nodes to share resources . In computer networks , networked computing devices exchange data with each other using a data link . The connections between nodes are established using either cable media or wireless media . The best - known ___MASK52___ is the ___MASK91___ . The Ivy ___MASK85___ is a collegiate ___MASK27___ comprising sports teams from eight private institutions of higher education in the Northeastern United States . The conference name is also commonly used to refer to those eight schools as a group beyond the sports context . The eight institutions are Brown University , Columbia University , Cornell University , Dartmouth College , Harvard University , the University of Pennsylvania , Princeton University , and Yale University . The term " Ivy ___MASK85___ " has connotations of academic excellence , selectivity in admissions , and social elitism . CoDeeN is a ___MASK18___ ___MASK11___ created at Princeton University in 2003 and deployed for general use on PlanetLab . It operates as per the following : Users set their ___MASK91___ caches to a nearby high bandwidth proxy that participates in the ___MASK11___ . Requests to that proxy are then forwarded to an appropriate member of the ___MASK11___ that is in charge of the file ( should be caching it ) and that has sent recent updates showing that it is still alive . The file is forwarded to the proxy and thence to the client . What this means for normal users is that if you use this and a server is slow , however the content is cached on the ___MASK11___ , then ( after the first upload ) requests to that file will be fast . It also means that the request will not be satisfied by the original server , equivalent to free bandwidth . For rare files this ___MASK11___ could be slightly slower than downloading the file itself . Especially for non - cacheable content , you may as well go to the origin host . The ___MASK11___ ' s speed is also subject to the constraint of number of participating proxies . For the case of large files requested by many peers , it uses a kind of ' multi - cast stream ' from one peer to the others , which then distribute out to their respective proxies . CoBlitz , a CDN technology firm ( 2006 -- 2009 ) , was a take - off of this , in that files are not saved in the web cache of a single member of the proxy - ___MASK11___ , but are instead saved piece - wise across several members , and ' gathered up ' when they are requested . This allows for more sharing of disk space among proxies , and for higher fault tolerance . To access this ___MASK11___ , URLs were prefixed with http :// coblitz . codeen . org / . Verivue Inc . acquired CoBlitz in October 2010 . An intermediary ( or go - between ) is a third ___MASK6___ that offers intermediation services between ___MASK80___ parties . Princeton ___MASK43___ is a private Ivy League research ___MASK43___ in Princeton , New Jersey , United States . In ___MASK89___ networks , a ___MASK18___ is a ___MASK68___ ( a ___MASK89___ ___MASK11___ or an ___MASK51___ ) that acts as an intermediary for requests from clients seeking resources from other servers . A client connects to the ___MASK18___ , requesting some service , such as a file , connection , web ___MASK10___ , or other resource available from a different ___MASK68___ and the ___MASK18___ evaluates the request as a way to simplify and control its complexity . Proxies were invented to add structure and encapsulation to distributed systems . Today , most proxies are web proxies , facilitating access to content on the World Wide Web and providing anonymity . Larry L . Peterson is a noted American ___MASK89___ scientist , known primarily as the Director of the PlanetLab ___MASK48___ , co - author ( with Bruce Davie ) of the networking textbook " Computer Networks : A Systems Approach ," and for his research on the TCP Vegas congestion control algorithm and the x - kernel ___MASK72___ . In computing , a ___MASK25___ ( VM ) is an emulation of a computer ___MASK11___ . Virtual machines are based on computer architectures and provide functionality of a physical computer . Their implementations may involve specialized hardware , ___MASK76___ , or a combination . Princeton is a ___MASK30___ with a ___MASK54___ form of ___MASK26___ in Mercer County , New Jersey , United States , that was established in its current form on January 1 , 2013 , through the consolidation of the Borough of Princeton and Princeton Township . As of the 2010 United States Census , the ___MASK30___ ' s population was 28 , 572 , reflecting the former township ' s population of 16 , 265 , along with the 12 , 307 in the former ___MASK54___ . A testbed ( also " ___MASK95___ bed ") is a platform for conducting rigorous , transparent , and replicable testing of scientific theories , computational tools , and new technologies . The World Wide Web ( abbreviated WWW or the Web ) is an ___MASK28___ space where documents and other web resources are identified by Uniform Resource Locators ( URLs ), interlinked by hypertext links , and can be accessed via the ___MASK91___ . English scientist Tim Berners - Lee invented the World Wide Web in 1989 . He wrote the first web browser computer program in 1990 while employed at CERN in Switzerland . PlanetLab is a ___MASK24___ of computers available as a testbed for ___MASK89___ networking and distributed systems research . It was established in 2002 by Prof . Larry L . Peterson and Prof . David Culler , and as of ___MASK100___ 2010 , it was composed of 1090 nodes at 507 sites worldwide . Each ___MASK2___ has a " slice ", or virtual machine access to a subset of the nodes .