On-Demand Service in Cloud Computing

Cloud computing provides a new model not only of hardware and software infrastructure design and deployment,but also of user planning and usage of information systems.Flexible,convenient,efficient,inexpensive,and high quality service are typical features of the cloud computing model.This paper analyzes on-demand system architecture in cloud computing from the perspective of service,and explores on-demand service issues.These issues include managing and monitoring of distributed service resources,context-aware on-demand service modeling,on-demand automated service composition in large-scale networks,and service system analysis based on complex systems.Taking the continuously operating reference station network of a geo-spatial information system as an example,this paper examines its architecture from the perspective of cloud computing and also explores some fundamental questions about its service.