Refereed Publications
- Norihiro Fujii, and Nobuhiko Koike, "New Virtual
Remote Laboratory Environments for Logic Circuit Design
Realizing an efficient sharing of Test Equipments and
Concurrent User Support," Proc. 7th International
Conference on Information Technology Based Higher Education
and Training ( ITHET2006 ), Sydney, Australia, July, 2006.
Abstract - The distance
learning is widely spreading its use in many areas thanks
to the Internet advancement. One of the emerging areas
is the remote laboratory. The proposed remote laboratory
system is to realize an internet based remote digital
logic circuit experiment, which enables efficient sharing
of test equipments both in space and time division fashions
as well as supporting many users to perform experiments
concurrently. Most existing remote laboratories are based
on exclusive use of experimental equipments applying the
client-server models via the Internet. Once users start
remote experiments, these test-benches including target
FPGA boards, logic analyzers or pattern generators are
exclusively occupied for a long period of time. As available
test-bench numbers are strictly restricted to the available
physical numbers, it becomes difficult to provide enough
experimental environments supportable for many users at
the same time. In order to overcome such shortcomings,
the authors realized virtual experiment environments,
which share actual experiment equipments in space and
time division fashions on demand basis. Each user is allocated
a virtual experiment environment. It is possible to reside
many virtual experiment environments in the system more
than the available test-benches. In the course of the
test-and-experiments, available physical equipments necessary
to the experiment are dynamically allocated to the virtual
environments. In order to resolve the conflicts among
equipment usages, the job submission and allocation system,
Condor has been employed as the job manager. Although
Condor was originally developed for parallel machines
to allocate jobs, it is also suitable for the virtual
experiment environment handlings. It submits many virtual
experiment environments at the same time and allocates
equipments according to experiment-runs. As each experiment-run
contains number of different experiment stages, where
usages of the equipments differ from each other, an efficient
sharing of equipments becomes possible.
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