The Experts below are selected from a list of 2355 Experts worldwide ranked by ideXlab platform
Emil Sit - One of the best experts on this subject based on the ideXlab platform.
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Usenetdht a low overhead design for Usenet
Networked Systems Design and Implementation, 2008Co-Authors: Emil Sit, Robert Morris, Frans M KaashoekAbstract:Usenet is a popular distributed messaging and file sharing service: servers in Usenet flood articles over an overlay network to fully replicate articles across all servers. However, replication of Usenet's full content requires that each server pay the cost of receiving (and storing) over 1 Tbyte/day. This paper presents the design and implementation of UsenetDHT, a Usenet system that allows a set of cooperating sites to keep a shared, distributed copy of Usenet articles. UsenetDHT consists of client-facing Usenet NNTP front-ends and a distributed hash table (DHT) that provides shared storage of articles across the wide area. This design allows participating sites to partition the storage burden, rather than replicating all Usenet articles at all sites. UsenetDHT requires a DHT that maintains durability despite transient and permanent failures, and provides high storage performance. These goals can be difficult to provide simultaneously: even in the absence of failures, verifying adequate replication levels of large numbers of objects can be resource intensive, and interfere with normal operations. This paper introduces Passing Tone, a new replica maintenance algorithm for DHash [7] that minimizes the impact of monitoring replication levels on memory and disk resources by operating with only pairwise communication. Passing Tone's implementation provides performance by using data structures that avoid disk accesses and enable batch operations. Microbenchmarks over a local gigabit network demonstrate that the total system throughput scales linearly as servers are added, providing 5.7 Mbyte/s of write bandwidth and 7 Mbyte/s of read bandwidth per server. UsenetDHT is currently deployed on a 12-server network at 7 sites running Passing Tone over the wide-area: this network supports our research laboratory's live 2.5 Mbyte/s Usenet feed and 30.6 Mbyte/s of synthetic read traffic. These results suggest a DHT-based design may be a viable way to redesign Usenet and globally reduce costs.
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Usenetdht a low overhead Usenet server
International Workshop on Peer-to-Peer Systems, 2004Co-Authors: Emil Sit, Frank Dabek, James RobertsonAbstract:UsenetDHT is a system that reduces the storage and bandwidth resources required to run a Usenet server by spreading the burden of data storage across participants. UsenetDHT distributes data using a distributed hash table. The amount of data that must be stored on each node participating in UsenetDHT scales inversely with the number of participating nodes. Each node’s bandwidth requirements are proportional to the fraction of articles read rather than to the total number posted.
Marc A. Smith - One of the best experts on this subject based on the ideXlab platform.
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1 Grand Central Usenet: The Design and Evaluation of a Thread-Based Usenet Browser
2015Co-Authors: Carman Neustaedter, Marc A. Smith, Gina Danielle VenoliaAbstract:Interfaces to online discussion spaces, such as email discussions, lists, and newsgroups, do a poor job of representing the structure and temporal development of conversation threads. These limitations contribute to user overload and to the erosion of the value of these channels. In this paper, we present an alternative interface to threaded conversations, Grand Central Usenet, which features a graphical interface component that highlights the size, structure, and development of conversation threads. We harnessed this interface to Usenet newsgroup data and conducted a user study that contrasted this interface with a standard message browsing tool. Users showed significant improvements in productivity, reports of ease-of-use, and satisfaction with our design in contrast to a widely used standard interface
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picturing Usenet mapping computer mediated collective action
Journal of Computer-Mediated Communication, 2005Co-Authors: Tammara Combs Turner, Danyel Fisher, Marc A. Smith, Howard T WelserAbstract:Usenet is a complex socio-technical phenomenon, containing vast quantities of information. The sheer scope and complexity make it a challenge to understand the many dimensions across which people and communication are interlinked. In this work, we present visualizations of several aspects and scales of Usenet that combine to highlight the range of variation found in newsgroups. We examine variations within hierarchies, newsgroups, authors, and social networks. We find a remarkable diversity, with clear variations that mark starting points for mapping the broad sweep of behavior found in this and other social cyberspaces. Our findings provide the basis for initial recommendations for those cultivating, managing, contributing, or consuming collectively constructed conversational content.
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assessing differential usage of Usenet social accounting meta data
Human Factors in Computing Systems, 2005Co-Authors: A Bernheim J Brush, Tammara Combs Turner, Xiaoqing Wang, Marc A. SmithAbstract:We describe a usage study of NetscanTech, a system that generates and publishes daily a range of social metrics across three dimensions: newsgroup, author, and thread, for a set of approximately 15,000 technical newsgroups in Usenet. We bring together three interlinked datasets: survey data, usage log data and social accounting data from Usenet participation, to triangulate the relationship between various user roles and differential usage of social metrics in NetscanTech. We found our most frequent users focused on information related to individual authors far more than any other information provided. In contrast, users that visited less frequently focused more on information related to newsgroups and viewing newsgroup metrics. Our results suggest features that designers and developers of online communities may wish to include in their interfaces to support the cultivation of different community roles.
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measures and maps of Usenet
From Usenet to CoWebs, 2003Co-Authors: Marc A. SmithAbstract:This is a study of Usenet, a collection of social cyberspaces in which people gather, interact, and exchange digital objects. Digital objects include a range of media and data structures not limited to lines or pages of text, complex formatted documents, sound, still images and videos, 3D geometry, programs, and databases. Hundreds of millions of people are already engaged in interactions in social cyberspaces, and the number is likely to grow into the billions as networked computers become as widespread as radios or light bulbs. Over the next few years, the Internet will become a popular medium of a scale that dwarfs and subsumes earlier communication media including telephone, radio, and television. In the process, the net is creating new forms of social space, new kinds of publics, in which there are rare but remarkable examples of collective action.
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Visualization Components for Persistent Conversation
2001Co-Authors: Marc A. Smith, Andrew FioreAbstract:An appropriately designed interface to persistent, threaded conversations could reinforce socially beneficial behavior by prominently featuring how frequently and to what degree each user exhibits such behaviors. Based on the data generated by the Netscan data-mining project [9], we have developed a set of tools for illustrating the structure of discussion threads like those found in Usenet newsgroups and the patterns of participation within the discussions. We describe the benefits and challenges of integrating these tools into a multi-faceted dashboard for navigating and reading discussions in social cyberspaces like Usenet and related interaction media. Visualizations of the structure of online discussions have applications for research into the sociology of online groups as well as possible interface designs for their members. Keywords Visualization, persistent conversation, asynchronous threaded discussions, Usenet, newsgroup, social cyberspace
Larry N. Osborne - One of the best experts on this subject based on the ideXlab platform.
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HUMAN COMMUNICATIONS ISSUES Topic Development in Usenet Newsgroups
2014Co-Authors: Larry N. OsborneAbstract:While computer mediated discussions, such as those that take place in Usenet newsgroups, superficially appear to be analogous to verbal discussions, observation has shown significant differences. Usenet topics are created, and they evolve, mutate, and become extinct in ways fundamentally different from spoken dialogue. These differences can be explained partially by the asynchronous nature of electronic communication, as well as by other factors unique to such wide-scale multi-user media. Computer mediated communications may be divided into three types, based on the direction and exclusivity of the messages: One-to-many, exemplified by the World Wide Web; one-to-one, exemplified by electronic mail; and many-to-many, exemplified by bulletin boards. Thus
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Topic development in Usenet newsgroups
Journal of the Association for Information Science and Technology, 1998Co-Authors: Larry N. OsborneAbstract:While computer mediated discussions, such as those that take place in Usenet newsgroups, superficially appear to be analogous to verbal discussions, observation has shown significant differences. Usenet topics are created, and they evolve, mutate, and become extinct in ways fundamentally different from spoken dialogue. These differences can be explained partially by the asynchronous nature of electronic communication, as well as by other factors unique to such wide-scale multi-user media. © 1998 John Wiley & Sons, Inc.
Rich Salz - One of the best experts on this subject based on the ideXlab platform.
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internetnews Usenet transport for internet sites
USENIX Summer Technical Conference, 1992Co-Authors: Rich SalzAbstract:NNTP, the Network News Transfer Protocol, has been labelled the most widely implemented elective protocol in the Internet. The growth of the Internet has meant more sites exchanging NNTP data. While the explosive growth in Usenet traffic places demands on all sites, the goal of fast network access puts particular demands on NNTP hosts. InterNetNews is an implementation of the Usenet transport layer designed to address this situation. It replaces the standard UNIX server architecture with a single long-running server that handles all incoming connections. It has proven to be quite successful, providing quick and efficient news transfer.
James Robertson - One of the best experts on this subject based on the ideXlab platform.
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Usenetdht a low overhead Usenet server
International Workshop on Peer-to-Peer Systems, 2004Co-Authors: Emil Sit, Frank Dabek, James RobertsonAbstract:UsenetDHT is a system that reduces the storage and bandwidth resources required to run a Usenet server by spreading the burden of data storage across participants. UsenetDHT distributes data using a distributed hash table. The amount of data that must be stored on each node participating in UsenetDHT scales inversely with the number of participating nodes. Each node’s bandwidth requirements are proportional to the fraction of articles read rather than to the total number posted.
