云计算-专业英语论文

Cloud Computing

Chen Peng

School of Information Science and Technology, YanChen

Normal College,YanChen China

Email:*******************

Abstract--Cloud computing is a new computing model；it is developed based on grid computing．We introduced the development history of cloud computing and its application situation and gave a new definition；took google’s cloud computing techniques as an example，summed up key techniques，such as data storage technology(Google File System)，data management technology(BigTable)，as well as programming model and task scheduling model(Map—Reduce)，used in cloud computing；and analyzed the differences among cloud computing,grid computing and traditional super-computing，and fingered out the further development prospects of cloud computing．

Key words:cloud computing；data storage；data management；programming model

Ⅰ. Definition

Cloud computing is the development of distributed computing, parallel processing, and grid computing, which represents an emerging business computing model

Ⅱ. Cloud Computing Summary

Cloud computing is a kind of network service and is a trend for future computing Scalability matters in cloud computing technology Users focus on application development Services are not known geographically

Ⅲ. The specific characteristics

1)Data in the cloud: not afraid to lose, do not have to back up,

you can restore at any point;

2)Software in the cloud: You do not have to download and update

yourself ；

3)Ubiquitous computing: at any time, any place, any device, log

in to enjoy computing services;

4)Powerful computing: unlimited space, unlimited speed

Ⅳ. The main forms of service

1)Software as a Service(SaaS)

2)SaaS service providers deploy application software on the

server, users on demand ordered from the manufacturer via the Internet, service providers charge based on customer's needs, and to provide customers with the software through a browser.

3)Platform as a Service(PaaS)

4)Manufacturers provide a development environment, server

platforms, hardware resources services to customers, custom develop their own application and pass through its servers and the Internet to other customers

5)Infrastructure services(IaaS)

6)"Cloud" infrastructure consisting of multiple servers, provide

measurement services to customers.

Ⅴ. Characteristics

1)In general, cloud computing customers do not own the physical

infrastructure, instead avoiding capital expenditure by renting usage from a third-party provider. They consume resources as a service and pay only for resources that they use. Many cloud-computing offerings employ the utility computing model, which is analogous to how traditional utility services (such as electricity) are consumed, whereas others bill on a subscription basis. Sharing "perishable and intangible" computing power among multiple tenants can improve utilization rates, as servers are not unnecessarily left idle (which can reduce costs significantly while increasing the speed of application development). A side-effect of this approach is that overall computer usage rises dramatically, as customers do not have to engineer for peak load limits. In addition, "increased high-speed bandwidth" makes it possible to receive the same response times from centralized infrastructure at other sites.

2)The cloud is becoming increasingly associated with small and

medium enterprises (SMEs) as in many cases they cannot justify or afford the large capital expenditure of traditional IT. SMEs also typically have less existing infrastructure, less bureaucracy, more flexibility, and smaller capital budgets for