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The micro grid is a cluster of electricity generators, energy storage systems, and loads that can operate connected, as well as disconnected, from the distribution grid. In this paper the time related characteristics of Cyber Physical Systems (CPCs) to be used for (IEC 61850-based) automation of micro grids are investigated. Specific constrains are taken into account as, for instance: the use of heterogeneous...
Distributed Hash Tables (DHTs) have been deployed in a wide variety of peer-to-peer (P2P) networks. While the traditional use of P2P technology is focused around content sharing, the current trend is in applying the P2P technology for new application areas, such as interpersonal communications. Despite active research and standardization efforts, such as the development of Peer-to-Peer Session Initiation...
This paper presents a novel DVB/IP infrastructure that exploits P2P technology for optimised resource exploitation in interactive services' provision. Building upon a prototype DVB-T regenerative platform, it presents a decentralised architecture that exploits the broadcasting stream as part of the core/backbone network, providing interactive IP services to rural/urban citizens. Users access the provided...
A P2P-SIP architecture relying on open-source SIP stacks and JXTA platform is proposed, where the centralized SIP registration and location are implemented via P2P publishing and service location, respectively. A novel P2P-SIP protocol-JXP is presented and a prototype is designed and developed based on LINUX. The prototype system has been developed for transporting typical VoIP call controls and real-time...
MMOG are very large distributed applications, sharing very large states, and supporting communication between potentially thousands of player nodes. Despite the development of many solutions to define suitable architecture and communication protocols and enabling efficient deployment of these types of applications, many issues remain. In this paper, we present a new framework to build more dynamic...
In software development there is always the need for faster development process. One way to speed up the process is to reuse existing components, in which loose coupling of the components is an important prerequisite. Publish/subscribe is one popular way to provide loose coupling, and there exists many middleware solutions for it. However, most such solutions are aimed for large inter-device networks,...
In recent times real-time distributed systems have definitively become peer-to-peer organized. The common interactions are those of different real-time components dealing with sensors or actuators, implementing controllers, performing monitoring and surveillance tasks, and interacting between them in a dynamic decentralized way. There is a need for mechanisms that allow the integration of these independent...
In this paper, we propose a hierarchical architecture to realize a real-time file search in P2P systems. The proposed architecture consists of three layers. Index of files held by the peers in the bottom layer is stored at the peers in the middle layer, and the correlation of peers in the two bottom layers is controlled by the peers in the top layer using the notion of tags. With such notion of tags,...
The lack of developing platforms and the incompatibilities of protocols result in difficulties in rapidly developing P2P applications, and JXTA proposed by SUN corporation is an opensource platform to solve these problems, but it still needs to be improved. The characteristics between JXTA and mobile agent are analyzed in this paper. A novel JXTA architecture based on mobile agent is proposed. A new...
Name Services for the Internet of Things (specifically, the EPCglobal Network) are distributed systems that serve the following fundamental lookup function: Given an identifier for a real-world object, e.g., an Electronic Product Code (EPC), they return a list of Internet addresses of services, which offer additional information about this object. Without name services acting as a broker between items...
SIP (session initiation protocol) has been chosen as the protocol for IP-based multimedia call control for 3G wireless networks. P2P (peer-to-peer) networks are useful in a wide range of application scenarios in personal, commercial, public and military environments. In this paper a JXTA-based SIP communication system for P2P wireless networks is proposed, which is compatible with other JXTA systems...
Peer-to-peer (P2P) file sharing networks attract much attention from legal and research communities. The success and popularity of P2P networks provides a new paradigm for sharing and distributing information. However, the widespread illegal distribution of the copyright protected works and anonymous malicious attacks to the network raise serious concerns for the future of P2P applications. Legal...
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