What is the Grid? How are Grids built and used (today)? What Grid software is available and what does it do? BREAK (somewhere during part III) How have others succeeded? History For years, a few whacky computer scientists have been trying to help other scientists use distributed computing. Interactive simulation (climate modeling) Very large scale simulation and analysis (galaxy formation, gravity waves, battlefield simulation) Engineering (parameter studies, linked component models) Experimental data analysis (high-energy physics) Image and sensor analysis (astronomy, climate study, ecology) Online instrumentation (microscopes, x-ray devices, etc.)

Remote visualization (climate studies, biology) Engineering (large-scale structural testing, chemical engineering) In these cases, the scientific problems are big enough that they require people in several organizations to collaborate and share computing resources, data, instruments. What Types of Problems? Your system administrators can’t agree on a uniform authentication system, but you have to allow your users to authenticate once (using a single password) then use services on all systems, with per-user accounting. ou need to be able to offload work during peak times to systems at other companies, but the volume of work they’ll accept changes from day-to-day.

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