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Syntax for Binding Documents with Time-Stamps This document describes an envelope that can be used to bind a file (not necessarily protected by means of cryptographic techniques) with one or more time-stamp tokens obtained for that file, where "timestamp token " has the meaning defined in RFC 3161 or its successors. Additional types of temporal evidence are also allowed. The proposed envelope is based on the Cryptographic Message Syntax as defined in RFC 5652. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. This is a contribution to the RFC Series, independently of any other RFC stream. The RFC Editor has chosen to publish this document at its discretion and makes no statement about its value for implementation or deployment. Documents approved for publication by the RFC Editor are not a candidate for any level of Internet Standard; see Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained a

A new approach to the assessment of stochastic errors of radio source position catalogues

Assessing the external stochastic errors of radio source position catalogues derived from VLBI observations is important for tasks such as estimating the quality of the catalogues and their weighting during combination. One of the widely used methods to estimate these errors is the three-cornered-hat technique, which can be extended to the N-cornered-hat technique. A critical point of this method is how to properly account for the correlations between the compared catalogues. We present a new approach to solving this problem that is suitable for simultaneous investigations of several catalogues. To compute the correlation between two catalogues $A$ and $B$, the differences between these catalogues and a third arbitrary catalogue $C$ are computed. Then the correlation between these differences is considered as an estimate of the correlation between catalogues $A$ and $B$. The average value of these estimates over all catalogues $C$ is taken as a final estimate of the target correlation. In this way, an exhaustive search of all possible combinations allows one to compute the paired correlations between all catalogues. As an additional refinement of the method, we introduce the concept of weighted correlation coefficient. This technique was applied to nine recently published radio source position catalogues. We found large systematic differences between catalogues, that significantly impact determination of their stochastic errors. Finally, we estimated the stochastic errors of the nine catalogues

Multicast Mobility in Mobile IP Version 6 (MIPv6) : Problem Statement and Brief Survey

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