1,081 research outputs found
Effective temperature for finite systems
Under the Ansatz that the occupation times of a system with finitely many
states are given by the Gibbs distribution, an effective temperature is
uniquely determined (up to a choice of scale), and may be computed de novo,
without any reference to a Hamiltonian for empirically accessible systems. As
an example, the calculation of the effective temperature for a classical Bose
gas is outlined and applied to the analysis of computer network traffic.Comment: 9 pages, 10 figure
Where is My Next Hop ? The Case of Indian Ocean Islands
Internet has become a foundation of our modern society. However, all regions
or countries do not have the same Internet access regarding quality especially
in the Indian Ocean Area (IOA). To improve this quality it is important to have
a deep knowledge of the Internet physical and logical topology and associated
performance. However, these knowledges are not shared by Internet service
providers. In this paper, we describe a large scale measurement study in which
we deploy probes in different IOA countries, we generate network traces,
develop a tool to extract useful information and analyze these information. We
show that most of the IOA traffic exits through one point even if there exists
multiple exit points
On the Experimental Evaluation of Vehicular Networks: Issues, Requirements and Methodology Applied to a Real Use Case
One of the most challenging fields in vehicular communications has been the
experimental assessment of protocols and novel technologies. Researchers
usually tend to simulate vehicular scenarios and/or partially validate new
contributions in the area by using constrained testbeds and carrying out minor
tests. In this line, the present work reviews the issues that pioneers in the
area of vehicular communications and, in general, in telematics, have to deal
with if they want to perform a good evaluation campaign by real testing. The
key needs for a good experimental evaluation is the use of proper software
tools for gathering testing data, post-processing and generating relevant
figures of merit and, finally, properly showing the most important results. For
this reason, a key contribution of this paper is the presentation of an
evaluation environment called AnaVANET, which covers the previous needs. By
using this tool and presenting a reference case of study, a generic testing
methodology is described and applied. This way, the usage of the IPv6 protocol
over a vehicle-to-vehicle routing protocol, and supporting IETF-based network
mobility, is tested at the same time the main features of the AnaVANET system
are presented. This work contributes in laying the foundations for a proper
experimental evaluation of vehicular networks and will be useful for many
researchers in the area.Comment: in EAI Endorsed Transactions on Industrial Networks and Intelligent
Systems, 201
Survey of End-to-End Mobile Network Measurement Testbeds, Tools, and Services
Mobile (cellular) networks enable innovation, but can also stifle it and lead
to user frustration when network performance falls below expectations. As
mobile networks become the predominant method of Internet access, developer,
research, network operator, and regulatory communities have taken an increased
interest in measuring end-to-end mobile network performance to, among other
goals, minimize negative impact on application responsiveness. In this survey
we examine current approaches to end-to-end mobile network performance
measurement, diagnosis, and application prototyping. We compare available tools
and their shortcomings with respect to the needs of researchers, developers,
regulators, and the public. We intend for this survey to provide a
comprehensive view of currently active efforts and some auspicious directions
for future work in mobile network measurement and mobile application
performance evaluation.Comment: Submitted to IEEE Communications Surveys and Tutorials. arXiv does
not format the URL references correctly. For a correctly formatted version of
this paper go to
http://www.cs.montana.edu/mwittie/publications/Goel14Survey.pd
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