105 research outputs found
De betrouwbaarheid van elektronische gegevens als bewijsmiddel in het Nederlandse, Duitse en Amerikaanse civiele bewijsrecht
No full textOskamp, A. [Promotor]Brazier, F.M.T. [Promotor
The Design and Implementation of the Mansion Mobile Agent System
No full textTanenbaum, A.S. [Promotor]Brazier, F.M.T. [Promotor
The Anatomy of Design: Foundations, Models and Applications
No full textBrazier, F.M.T. [Promotor]Treur, J. [Promotor
Agent-Based Mediated Service Negotiation
No full textBrazier, F.M.T. [Promotor]Overeinder, B.J. [Copromotor
Agent Based Matchmaking and Clustering: A Decentralized Approach to Search
No full textBrazier, F.M.T. [Promotor]Steen, M.R. van [Promotor
Automated Web Service Reconfiguration
No full textBrazier, F.M.T. [Promotor]Langen, P.H.G. van [Copromotor
Zeker over zoeken?: Naar een juridisch kader voor verrichtingen van zoeksystemen met betrekking tot via internet beschikbare open content
No full textJansen, C.E.C. [Promotor]Oskamp, A. [Promotor]Brazier, F.M.T. [Copromotor
Multi-level Reconfigurable Self-organization in Overlay Services
No full textLarge-scale decentralized systems organized in overlay networks are complex to manage. Such systems integrate organizational complexity in the application-level resulting in low abstraction and modularity in their services. This thesis introduces a multi-level conceptual architecture for overlay services. An overlay service is a large-scale decentralized system organized in overlay networks that provides generic application capabilities. Two overlay services introduced in this thesis provide a proof-of-concept for the higher abstraction and modularity that can be achieved with this architecture. The first overlay service builds and maintains overlay networks that are self-organized in different tree topologies according to different application criteria. The second overlay service performs a function-indepencent and routing-independent decentralized aggregation of values that are distributed in a network and continuously changing. Experimental evaluation studies the performance trade-offs imposed by this generic design. This thesis studies overlay services in the application domain of the Smart Power Grid. More specifically, overlay services are used in demand-side energy management to perform (i) load-shifting and (ii) demand-adjustment in a fully decentralized fashion. The evaluation of this approach is grounded in the current reality and practice of the Smart Power Grid.Multi Actor SystemsTechnology, Policy and Managemen
Negotiation and Monitoring in Open Environments
No full textLarge scale, distributed, digital environments offer vast potential. Within these environments, software systems will provide unprecedented support for daily life. Offering access to vast amounts of knowledge and resources, these systems will enable wider participation of society, at large. An example is the Smart Energy Grid that increases sustainability and decreases reliance on fossil fuels. Such systems require technology that is capable of negotiating Service Level Agreements (SLAs) between consumers and providers. Multi Agent Systems (MAS) is one such technology that offers a straightforward analog for complex systems of autonomous parties. MAS is based on the notion of autonomous agents that represent human actors (i.e. owners) and are capable of negotiating SLAs and coordinating processes with other agents. They know their owner’s preferences and needs. They are capable of negotiating price, Quality of Service (QoS) characteristics and penalties. They also monitor provisioning of services to detect and penalize service violations. This dissertation presents a MAS framework for automated negotiation and monitoring of SLAs in open environments. In this context, an open environment is a large-scale, distributed environment that is also dynamic and untrusted. This framework enables secure discovery, negotiation and access to distributed resources. Through a process of exchanging messages (e.g. offers, counter-offers), agents together search for a mutually acceptable agreement (e.g. service, price, quality). A negotiation protocol defines the negotiation objects (i.e. offers), language and rules governing interaction. This dissertation presents the WS-Agreement Negotiation protocol with extensions for open environments. This protocol is experimentally validated in the AgentScape middleware. Open environments also present challenges regarding security, trust and privacy. No single authority has complete control over an open environment and no single authority governs the actions of all participants (i.e. agents). Therefore, additional mechanisms are required to ensure security, privacy and promote trust between participants. Automated monitoring mechanisms using a Trusted Third Party (TTP) address issues of security and thus support negotiation in open environments. This dissertation presents a self-adaptive monitoring approach that (1) offers monitoring assurance that agreements are honored, (2) builds a secure audit log of agreement compliance, (3) performs measurements while safeguarding privacy of (sensitive) data, (4) dynamically reacts to changes in risk and (5) enables trust-building between consumers and providers. This monitoring approach is experimentally validated in the AgentScape middleware. Automation of complex tasks, such as negotiation, can increase efficiency. To illustrate these benefits, the framework is applied to two complex systems, including the Smart Energy Grid. In this case, the looming complexity crisis of intermittent generation, real-time pricing and consumer demand shifting requires immediate attention. This domain presents not only technical (e.g. smart-meters) but also social challenges (e.g. user acceptance). The MAS automation framework presented in this dissertation addresses technical challenges by reducing manual labor and increasing efficiency. Automation even enables higher utilization of green resources and reduction of waste (e.g. produced, but unconsumed energy). Transparent, trusted monitoring mechanisms address social challenges by ensuring privacy of (sensitive) data and encouraging user acceptance. Software systems, such as those presented in this dissertation, enable wider participation of society, at large, and offer vast potential.Multi Actor SystemsTechnology, Policy and Managemen
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