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Public Network (public + network)

Distribution by Scientific Domains

Information Science and Computing	50%

Selected Abstracts

Distribution-based anomaly detection in 3G mobile networks: from theory to practice

INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, Issue 5 2010
Alessandro D'Alconzo
The design of anomaly detection (AD) methods for network traffic has been intensively investigated by the research community in recent years. However, less attention has been devoted to the issues which eventually arise when deploying such tools in a real operational context. We designed a statistical based change detection algorithm for identifying deviations in distribution time series. The proposed method has been applied to the analysis of a large dataset from an operational 3G mobile network, in the perspective of the adoption of such a tool in production. Our algorithm is designed to cope with the marked non-stationarity and daily/weekly seasonality that characterize the traffic mix in a large public network. Several practical issues emerged during the study, including the need to handle incompleteness of the collected data, the difficulty in drilling down the cause of certain alarms, and the need for human assistance in resetting the algorithm after a persistent change in network configuration (e.g. a capacity upgrade). We report on our practical experience, highlighting the key lessons learned and the hands-on experience gained from such an analysis. Finally, we propose a novel methodology based on semi-synthetic traces for tuning and performance assessment of the proposed AD algorithm. Copyright © 2010 John Wiley & Sons, Ltd. [source]

A note on a secure voting system on a public network

NETWORKS: AN INTERNATIONAL JOURNAL, Issue 4 2004
M. G. Karagiannopoulos
Abstract This article shows that the procedure proposed in Chang and Wu (1997) and extended in Dini (2001) does not always produce accurate results. A modification that makes the procedure correct is suggested. © 2004 Wiley Periodicals, Inc. [source]

Public IP network infrastructure evolutions to support emerging digital video services

BELL LABS TECHNICAL JOURNAL, Issue 2 2009
Marc Verhoeyen
Of all the services offered over a worldwide public network, digital video-based services, even at this early stage of development, are growing at such an astonishing rate that they will soon constitute the largest portion of Internet traffic. We are witnessing this today with the Internet television (TV) phenomenon, with YouTube, Netflix's online offering, and BBC's iPlayer serving as prominent examples. To optimize video-dominated networks with respect to the required transport capacity (and also to reduce the response time the end user experiences), these services need to be supported by new networking capabilities. Caching in conjunction with specific unicast and multicast techniques for ingress and egress traffic can achieve this goal. In this paper we discuss how, explicitly by using cache cooperation techniques, we can deal with heterogeneous content preferences among end users. The paper shows simulation results and discusses relevant parameters with respect to the Internet TV use cases mentioned. Finally, it provides an outlook on the longer term and demonstrates that investment in these new capabilities is future-safe. © 2009 Alcatel-Lucent. [source]

TOWARDS AN EXOGENOUS THEORY OF PUBLIC NETWORK PERFORMANCE

PUBLIC ADMINISTRATION, Issue 3 2009
PATRICK KENIS
This article offers insights into the complexity of assessing the performance of public networks. We have identified three so-called exogenous factors: form of the network, type of inception,whether the network was initially formed as voluntary or mandated,and developmental stage of the network. We argue that where a network stands on each of these factors will determine the appropriateness of specific criteria for assessing the performance of the network. [source]