7,506 research outputs found
Efficient Batch Update of Unique Identifiers in a Distributed Hash Table for Resources in a Mobile Host
Resources in a distributed system can be identified using identifiers based
on random numbers. When using a distributed hash table to resolve such
identifiers to network locations, the straightforward approach is to store the
network location directly in the hash table entry associated with an
identifier. When a mobile host contains a large number of resources, this
requires that all of the associated hash table entries must be updated when its
network address changes.
We propose an alternative approach where we store a host identifier in the
entry associated with a resource identifier and the actual network address of
the host in a separate host entry. This can drastically reduce the time
required for updating the distributed hash table when a mobile host changes its
network address. We also investigate under which circumstances our approach
should or should not be used. We evaluate and confirm the usefulness of our
approach with experiments run on top of OpenDHT.Comment: To be presented at the 2010 International Workshop on Cloud
Computing, Applications and Technologie
Precisely Analyzing Loss in Interface Adapter Chains
Interface adaptation allows code written for one interface to be used with a
software component with another interface. When multiple adapters are chained
together to make certain adaptations possible, we need a way to analyze how
well the adaptation is done in case there are more than one chains that can be
used. We introduce an approach to precisely analyzing the loss in an interface
adapter chain using a simple form of abstract interpretation.Comment: 12 pages, 1 figure. Submitted to IASTED SE 201
Oxygen surface exchange kinetics of erbia-stabilized bismuth oxide
The surface oxygen exchange kinetics of bismuth\ud
oxide stabilized with 25 mol% erbia (BE25) has been studied\ud
in the temperature and pO2 ranges 773β1,023 K and 0.1β\ud
0.95 atm, respectively, using pulse-response 18Oβ16O isotope\ud
exchange measurements. The results indicate that BE25\ud
exhibits a comparatively high exchange rate, which is rate\ud
determined by the dissociative adsorption of oxygen. Defect\ud
chemical considerations and the observed pO2\ud
1=2 dependence\ud
of the rate of dissociative oxygen adsorption suggest\ud
electron transfer to intermediate superoxide ions as the rate\ud
determining step in surface oxygen exchange on BE2
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