1,721,064 research outputs found
On assembly sequence planning using Petri nets
No full textPetri nets have been proposed as a suitable tool for expressing precedence constraints and computing assembly sequences. Motivations for using Petri nets stem from their clear and well-defined semantics as well as from the formal analysis tools and techniques available. In this paper the operation and properties of Petri net models representing assembly plans are reconnected to the fundamental properties of Petri nets. In spite of the work already done on assembly planning using Petri nets, we feel that some of these results can benefit from a deeper binding to Petri net analysis techniques. This reinterpretation leads to more efficient and straightforward techniques for finding all assembly sequences, selecting the best sequence according to some cost criterion, composing subassemblies, and evaluating plan performance in some specified workcell setup
Distributed reputation management for service-oriented peer-to-peer enterprise communities
No full textPeer-to-peer service sharing might allow for unmediated, almost instantaneous inter-firm collaboration, yet robust reputation management techniques are strongly required to withstand fraudulent actions of malicious peers. In this paper we illustrate a distributed reputation management system for service-oriented peer-to-peer networks, called SAFE, which exploits voting and eectively copes with trust misrepresentation attempts. Simulation results show that SAFE allows peers to select high-quality services, even when a large extent of malicious providers and advisors are active in the community
The Multi-Knowledge Service-OrientedArchitecture: Enabling Collaborative Research for E-health
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Performance evaluation of processor architectures for robotics
No full textSeveral commercially available processor architectures are evaluated with respect to their suitability for the robotic domain. A realistic workload, encompassing all the major computations required for high-performance robot manipulator control, is presented. The C language implementation of the algorithms, developed for evaluation purposes but reflecting an actual robotic system programming scenario, is also discussed. Results achieved by execution of the robotic benchmark suite on a set of advanced microprocessors are contrasted with those of conventional benchmarks, revealing architectural features and performance issues of interest for designers of computer systems targeted to robotic applications
An autonomic approach for P2P/cloud collaborative environments
No full textThe rise of Cloud Computing has progressively dimmed the interest in volunteer and peer-to-peer computing, in general. However, efficient and cost-effective large scale distributed collaborative environments cannot be achieved leveraging upon the Cloud alone. In this paper, we propose a novel hybrid P2P/cloud approach where components and protocols are autonomically configured according to specific target goals, such as cost-effectiveness, reliability and availability. The proposed approach is based on the Networked Autonomic Machine (NAM) framework, which allows distributed system designers to include different kinds of cost and performance constraints. As an example, we show how the NAM-based approach can be used to design collaborative storage systems, enabling the definition of an autonomic policy to decide, according to cost minimization and data availability goals, how to part data chunks among peer nodes and Cloud, based on the local perception of the P2P network
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