Upload
augustus-cook
View
213
Download
1
Embed Size (px)
Citation preview
Prepared by Celeste Ng
SaaS, Utility Computing, Grid Computing, Pervasive Computing
Summarized from:Turban, Efraim, Leidner, Dorothy, Mclean, Ephraim, Wetherbe, James, Information Technology For Management - Transforming Organizations in the Digital Economy, John Wiley & Sons, 6th Edition, 2009.
Prepared by Celeste Ng
The SOFTWARE-AS-A-SERVICE BUSINESS MODEL
Computing resources are made available to user when the resources are needed is the Software-as-a-Service(SaaS) model.
Paid for through a fixed subscription fee, or payable per an actual usage fee.
To overcome the common challenge to an enterprise of being able to meet fluctuating demands efficiently.
E.g. utilitycomputing.itworld.com, utilitycomputing.com, oracle.com/ondemand, Salesforce.com (on demand service for customer relationship management(CRM))
Prepared by Celeste Ng
SaaS: The Utility Computing Concept
Utility computing is computing that is as available, reliable, and secure as electricity, water services ,and telephony.
Have computing resources available on demand from virtual utilities around the globe.
Prepared by Celeste Ng
Limitations of Utility Computing
Key pieces of the technology are still missing. Is hard to do in heterogeneous data centers. Works better for some applications than for
others. Needs extra security. Based on a survey, other concerns include:
Vendor dependency and lock in(50.8%), Performance and reliability(45.9%), Business data too critical to trust to outsiders(41.6%), Loss of control over key resources(38.3%)
Prepared by Celeste Ng
GRID Computing
Coordinates the use of a large number of servers and storage ,acting as one computer.
Many of the current grid applications are in areas that formerly would have required supercomputers.
A well-known grid-computing project is the SETI Home project. PC users worldwide donate unused processor cycle times to
help the search for signs of extraterrestrial life by analyzing signals coming from outer space.
Project to harness the unused processing power of the user’s computers.
Save the project both money and resources.
Grid Computing Applications
„ The Cancer Institute of New Jersey ‰ With IBM researchers, they use Grid computing to convert
hundreds of thousands of images of cancerous tissues and cells, from cancer centers around the country, into digital images
„ Financial services firm Wachovia Corp. ‰Use grid computing to draw computing power from servers
spread across cities in US and London
„ Paypal ‰Use grid computing in its electronic payment processing
system
Prepared by Celeste Ng
Prepared by Celeste Ng
Pervasive computing
A future in which computation becomes part of the environment. Computation will be embedded in things, not in computers.