This paper discusses the requirements of current and emerging applications based on the Open Archives Initiative (OAI) and emphasizes the need for a common infrastructure to support them. Inspired by HTTP proxy, cache, gateway and web service concepts, a design for a scalable and reliable infrastructure that aims at satisfying these requirements is presented. Moreover it is shown how various ap...

Performance failures are commonplace in most computing environments; without system monitoring they typically go undetected. The performance monitoring project uses low level system monitoring combined with an infrastructure to centralize the information tracks long term system behavior. With the data visualization tools we can detect performance failures, track resource utilization trends, and...

In this paper we describe ConStruct, a distributed, contextaggregation based service infrastructure which supports the development of context-aware applications. ConStruct operates by automatically generating and maintaining directed context-processing graphs which connect applications to the sources of data they require at a relevant level of abstraction. The infrastructure also supports the d...

Mobile wireless computing devices such as cellphones, pagers, personal digital assistants, pocket PCs, and tablet computers are all potential platforms for participating in small group, wireless, many-to-many distributed applications. The networking technology needed to support such applications is readily available. However, almost all existing middleware infrastructure for distributed applica...

Many heterogeneous and highly specialized software applications for eHealth have been implemented and deployed by diverse health organizations, such as public and private hospitals and health care centers. The rational management of these eHealth assets together with their efficient and interoperable integration represents today a major hitherto unresolved challenge for the health sector at a g...

Internet applications can take advantage of a paradigm based on autonomous and mobile agents. However, suitable abstractions and infrastructures are required for the effective engineering of such applications. In this paper, we argue that a conceptual framework for context-dependent coordination, supported by an infrastructure based on programmable media, can promote a modular and easy to manag...