research unit 1

This site is powered by Aigaion - A PHP/Web based management system for shared and annotated bibliographies. For more information visit


Type of publication:Inproceedings
Entered by:
TitleLocating Information with Uncertainty in Fully Interconnected Networks
Bibtex cite IDRACTI-RU1-2000-24
Booktitle DISC 2000, Distributed Computing, 14th International Conference
Year published 2000
Keywords Search,Information Retrieval,Complete Network,Uncertainty,Random Walk
We consider the problem of searching for a piece of information in a fully interconnected computer network or clique by exploiting advice about its location from the network nodes Each node contains a database that knows what kind of documents or information are stored in other nodes e.g. a node could be a Web server that answers queries about documents stored on the Web. The databases in each node when queried provide a pointer that leads to the node that contains the information. However this information is up to date or correct with some bounded probability. While in principle one may always locate the information by simply visiting the network nodes in some prescribed ordering this requires a time complexity in the order of the number of nodes of the network. In this paper we provide algorithms for locating an information node in the complete communication network that take advantage of advice given from network nodes The nodes may either give correct advice by pointing directly to the information node or give wrong advice by pointing elsewhere We show that on the averageif the probability that a node provides correct advice is asymptotically larger than where is the number of the computer nodes then the average time complexity for locating the information node is asymptotically or depending on the available memory.The probability may in general be a function of the number of network nodes . On the lower bounds side we prove that noxed memory deterministic algorithm can locate the information node in nite expected number of steps. We also prove a lower bound of for the expected number of steps of any algorithm that locates the information node in the complete network.
Kirousis, Lefteris
Kranakis, Evangelos
Krizanc, Danny
Stamatiou, Yannis
locating information.pdf (main file)
Publication ID818