Biomedical Engineering Reference
In-Depth Information
SaaS
Software as a service (SaaS) is a software distribution model, designed for web
delivery, user can deploy and access through the Internet hosting. SaaS providers
need to build information for all network infrastructure, software, hardware, oper-
ating platform, and is responsible for the implementation of all post-maintenance
and other services. Compared with the traditional method of service, SaaS not only
reduces the cost of traditional software licensing, and vendors deploy application
software on a unified server, eliminating the end-user's server hardware, network
security devices and software upgrade, and maintenance expenses, the customer
does not need other IT investment in addition personal computers and Internet
connections to obtain the required software and services.
Framework for Cloud-Based E-Learning
The Base Layer of E-Learning Cloud
The base layer of e-learning cloud shares IT infrastructure resources and connects
the huge system pool together to provide services. Cloud computing allows the
hardware layer to run more like the internet, to make the hardware resources
shared and accessed as data resources in secure and scalable way. Virtualization
technology separates the physical hardware from operating system, which on one
hand can make computing and storage capacity of the existing server into smaller
size and re-integration, to improve the utilization and flexibility of IT resource; on
the other hand, can provide a common interface for large-scale cloud computing
integration that enables the publication of calculation. The base layer can provide
the basic hardware resources for the platform layer, and the users can also make
use of it the same as using a local device.
The Platform Layer of E-Learning Cloud
With the support of the powerful hardware, platform layer carries out the tasks of
data storage, computing, and software development, and it can even achieve the
tasks of completion of the original mass data storage, business intelligence
processing, and so on which have been difficult to complete. Users can choose the
devices and the number of devices according to the complexity of dealing with the
content. Virtualization technology enables the platform to show a strong level of
flexibility.
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