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Group desicion support system (GDSS) is an important part of CSCW. Data warehouse (DW) provides the supporting for OLAP and DSS. But most present DSS based on DW don't support well the cooperative decision among decision-makers. To give the enterprise group decision a better support, we put forward a new multi-data warehouse model (SEGDD-WM). This model(More)
It is an important problem for pervasive computing to coordinate and compose large numbers of devices and services to achieve users' various task goals. The pervasive computing environment is transparent for users. In order to simplify the interaction between users and the environment, this paper presents a goal-driven approach of service composition. We(More)
Software as a Service (SaaS) is thriving as a new mode of service delivery and operation with the development of network technology and the maturity of application software. SaaS application providers offer services for multiple tenants through the “single-instance multi-tenancy” model, which can effectively reduce service costs due to scale(More)
In SaaS model, a single instance of a SaaS application can serve multiple tenants who have different specific business needs. In many cases a tenant demands to customize with a SaaS application out of more than one virtualized application and run multiple business applications simultaneously, and moreover these different business applications have many(More)
In order to minimize the distortion of secret image, a novel steganographic method based on sign embedding and fuzzy theory is presented in this paper. By incorporating fuzzy theory with human visual system (HVS), a fuzzy classifier for DCT sub-blocks is first developed to realize the adaptive selection of the embedding strength. The new embedding scheme(More)
Software as a Service (SaaS) has become a popular software service mode. Tenants can access SaaS application via the web and essentially rent the application from SaaS provider. This paper proposes a flexible, multi-tenant oriented business process customization system to resolve the problem caused by orchestrating SaaS business process base on BPEL. The(More)
With the rapid development of Internet and the gradual maturity of SOA, SaaS has become a popular software service mode. This paper proposes a flexible business process customization framework to solve problems caused byorchestrating SaaS business process through BPEL specifications. The framework is fully independent of BPEL engine and web services, which(More)