Currently, different technologies provide solutions to successfully resolve the continuity of the service of a mobile host. The employment of a middleware is a common approach to face this issue, supporting also heterogeneity. In addition to the usual requirements of bandwidth, delay, or CPU load, multimedia applications have special features that are still being studied in a mobile scenario, a...

Several new applications of mobile computing environments, such as Intelligent Transportation Systems, Fleet Management and Logistics, and integrated Industrial Process Automation share the requirement of remote monitoring and high performance processing of huge data streams produced by large sets of mobile nodes. Two key requirements for the deployment and operation of such mobile infrastructu...

The DDS middleware (Data Distribution Service) has being used for addressing the data distribution and interoperability between different networks, architectures and operating systems. A essential point in the integration of these heterogeneous environments relies on the discovery process. A DDS discovery protocol matches publisher and subscriber entities (Endpoints) placed in different network...

In this paper, we present the architecture of a middleware that supports rich sensor networks. A rich sensor network is composed of resource-constrained content-providing sensor devices connected to resource rich entities, for example desktops and laptops. The key design concerns of this system are flexibility, scalability, ease of use and provision for quality of service. We want the system to...

Coherent wide-area data caching can improve the scalability and responsiveness of distributed services such as wide-area le access, database and directory services, and content distribution. However, distributed services differ widely in the frequency of read/write sharing, the amount of contention between clients for the same data, and their ability to make tradeoffs between consistency and av...

This paper discusses the applicability of the Data Distribution Service (DDS) for the development of automated and modular manufacturing systems which require a flexible and robust communication infrastructure. DDS is an emergent standard for datacentric publish/subscribe middleware systems that provides an infrastructure for platform-independent many-to-many communication. It particularly addr...

Distributed applications are difficult to build and maintain and are even more difficult when the applications are distributed over wide-area networks. Distributed Object Computing middleware has emerged to simplify the building of distributed applications by hiding implementation details behind functional interfaces. However, critical applications have non-functional requirements, such as real...

Large-scale datacenters that handle continuous data streams require scalable and flexible communication infrastructure. The scalability of publish/subscribe (pub/sub) middleware coupled with fine-grained quality-of-service (QoS) support and adaptive transport protocols constitutes a promising area of research to address the challenges of these types of large-scale datacenters. This paper descri...

The Planetary Data System (PDS) has had a long tradition of using metadata. Metadata, which is literally data about data, describes the shape and meaning of data. Metadata enables both human researchers and automated systems to determine if a certain piece of data is the right piece, what operations may be done on it, whether it is of value for the current course of research, how it relates to ...

Implementing distributed applications in mobile ad-hoc networks is a challenge because of low bandwidth, small transmission range, unpredictable topology changes and the need to conserve energy in low powered devices. This paper presents a distributed auction system using a large scale adhoc network as its sole communication platform. The auction system is built on top of a basic middleware ser...