Designing And Implementing B2B Applications Using Argumentative Agents

This paper presents a framework for modeling and deploying Business-to-Business (B2B) applications, with autonomous agents exposing the individual components that implement these applications. This framework consists of three levels identified by strategic, application, and resource, with focus here on the first two levels. The strategic level is about the common vision that independent businesses define as part of their decision of partnership. The application level is about the business processes that get virtually integrated as result of this common vision. Since conflicts are bound to arise among the independent applications/agents, the framework uses a formal model based upon computational argumentation theory through a persuasion protocol to detect and resolve these conflicts. In this protocol, agents call reason about partial information using partial arguments, partial attack and partial acceptability. Agents can then jointly find arguments supporting a new solution for their conflict, which is not known by any of them individually. Termination. soundness, and completeness properties of this protocol are presented. Distributed and centralized coordination strategies are also supported in this framework, which is illustrated with a simple online purchasing cage study

Designing and trusting multi-agent systems for B2B applications

This thesis includes two main contributions. The first one is designing and implementing B usiness-to-B usiness (B2B ) applications using multi-agent systems and computational argumentation theory. The second one is trust management in such multi-agent systems using agents' credibility. Our first contribution presents a framework for modeling and deploying B2B applications, with autonomous agents exposing the individual components that implement these applications. This framework consists of three levels identified by strategic, application, and resource, with focus here on the first two levels. The strategic level is about the common vision that independent businesses define as part of their decision of partnership. The application level is about the business processes, which are virtually integrated as result of this common vision. Since conflicts are bound to arise among the independent applications/agents, the framework uses a formal model based upon computational argumentation theory through a persuasion protocol to detect and resolve these conflicts. Termination, soundness, and completeness properties of this protocol are presented. Distributed and centralized coordination strategies are also supported in this framework, which is illustrated with an online purchasing case study followed by its implementation in Jadex, a java-based platform for multi-agent systems. An important issue in such open multi-agent systems is how much agents trust each other. Considering the size of these systems, agents that are service providers or customers in a B2B setting cannot avoid interacting with others that are unknown or partially known regarding to some past experience. Due to the fact that agents are self-interested, they may jeopardize the mutual trust by not performing the actions as they are supposed to. To this end, our second contribution is proposing a trust model allowing agents to evaluate the credibility of other peers in the environment. Our multi-factor model applies a number of measurements in trust evaluation of other party's likely behavior. After a period of time, the actual performance of the testimony agent is compared against the information provided by interfering agents. This comparison process leads to both adjusting the credibility of the contributing agents in trust evaluation and improving the system trust evaluation by minimizing the estimation error

Sistemas de gestão de destinos turísticos: contribuições para a sua adoção e implementação

The growing competition between tourist destinations, the progressively demanding tourist source markets, as well the complexity of the strategies to attract them, has led Destination Management Organisations (DMOs) to expand their attributions to assume themselves as central actors in the coordination of the stakeholders of respective destinations. Thus, some DMOs have implemented collaborative online networks, referred to as Destination Management Systems (DMSs), which connect all relevant tourist agents in a destination, facilitating communication and cooperation between them. These systems also provide online tourist portals for tourist destinations that offer more personalised travel planning experiences, including the possibility to purchase tourist products. However, only a residual number of tourist destinations has ever tried to adopt a DMS and a considerable portion of the them were unsuccessful. The challenges to the success of a DMS require a careful analysis of the factors that influence the willingness of the tourist agents of a destination to adopt them, as well as of the factors that determine the importance that these agents attribute to the functionalities of those same DMSs. However, research in this area is still limited. The main objectives of this thesis are to obtain an in-depth knowledge about the factors mentioned above, as well as on the characteristics and role of DMSs, in order to promote the implementation of these systems in tourist destinations. To achieve these objectives, a mixed methodology was adopted, starting with an extensive review of the literature on DMSs, exploratory interviews with the main companies providing DMS solutions and with DMOs that have successfully implemented these systems. At content analysis of those same DMSs was undertaken. This qualitative approach provided an in-depth knowledge regarding the characteristics of DMSs, the current business and management models of these systems, as well as their recent developments and future perspectives. Then, a quantitative approach was used to identify the factors that explain the willingness of destination-based stakeholders to adopt a DMS, as well as those influencing the importance attributed by these agents to the specific functionalities of DMSs. Thus, a questionnaire survey was applied to different types of tourist agents from a regional destination lacking a DMS: The Portuguese Centre region. The results of the quantitative investigation indicate that the predisposition to adopt a DMS is positively influenced by factors such as: (i) cooperation within the destination; (ii) pressure from the external environment (e.g. from competing destinations); (iii) perceived benefits and usefulness of the DMS; (iv) DMO's leadership and strategic vision; (v) resources and strategic vision of the tourist actors in the destination. On the other hand, two factors which are still absent from research on this topic were found to negatively influence the predisposition to adopt a DMS, namely: (i) alternative online platforms and (ii) the lack of a DMS in neighbouring regions or at the national level. The results also demonstrate that the importance attributed to the specific functionalities of a DMS by destination-based stakeholders is positively influenced (i) by its resources and strategic vision, (ii) by its knowledge on the DMO’s initiatives in the field of the Information and Communication and Technologies, (iii) the condition of affiliated member of a DMO; and (iv) by the tourist agent sub-sector, since it was found that tourism accommodation providers value collaborative functionalities of a DMS less than others. The thesis ends with conclusions and implications for the tourism sector, mainly for agents responsible for the development of tourist destinations.A crescente competição entre destinos turísticos, bem como a progressiva exigência da procura turística e da complexidade das estratégias para a atrair, levou as Organizações de Gestão de Destinos (OGD) a ampliarem as suas atribuições para se assumirem como atores centrais na coordenação dos stakeholders dos respetivos destinos. Assim, algumas OGDs implementaram redes colaborativas online, designadas de Sistemas de Gestão de Destinos (SGDs), que interligam todos os agentes turísticos relevantes de um destino, facilitando a comunicação e a cooperação entre eles. Estes sistemas também proporcionam à procura turística portais online de destinos turísticos que oferecem experiências de planeamento de viagens mais personalizadas, incluindo a possibilidade de comprar produtos turísticos. Porém, apenas um número residual de destinos turísticos tentou adotar um SGD e uma parcela considerável dos SGDs não tiveram sucesso. Os desafios para garantir o sucesso dos SGD exigem uma análise cuidada dos fatores que influenciam a predisposição dos agentes turísticos de um destino para os adotar, bem como dos fatores que determinam a importância que estes agentes atribuem às funcionalidades dos SGD. No entanto, a investigação neste âmbito é ainda limitada. A presente tese tem como principais objetivos obter um conhecimento aprofundado sobre os fatores anteriormente referidos, bem como sobre as características e papel dos SGD, no sentido de promover a implementação destes sistemas nos destinos. Para alcançar os objetivos estabelecidos, adotou-se uma metodologia mista, começando com uma extensiva revisão da literatura sobre SGD, entrevistas exploratórias às principais empresas fornecedoras de soluções de SGD e a OGD que implementaram estes sistemas com sucesso, bem como análises de conteúdo de SGD. Esta abordagem qualitativa permitiu um conhecimento mais aprofundado relativamente às características dos SGD, aos atuais modelos de negócios e de gestão destes sistemas, bem como aos seus recentes desenvolvimentos e perspetivas futuras. Seguidamente uma abordagem quantitativa foi utlizada para identificar os fatores que explicam a predisposição dos agentes turísticos de um destino para adotar um SGD, bem como os fatores que influenciam a importância atribuída por estes agentes às funcionalidades específicas dos SGD. Assim, um inquérito por questionário foi aplicado a diferentes tipos de agentes turísticos de um destino regional que não dispõe de um SGD: a região Centro de Portugal. Os resultados da investigação quantitativa indicam que a predisposição para adotar um SGD é influenciada positivamente por fatores como: (i) cooperação no destino; (ii) pressão do ambiente externo (ex. de destinos concorrentes); (iii) benefícios percebidos e utilidade do SGD; (iv) liderança e visão estratégica da OGD; (v) recursos e visão estratégica dos atores turísticos do destino. Por outro lado, dois fatores até agora ausentes da investigação influenciam negativamente a predisposição para adotar um SGD, nomeadamente: (i) as plataformas alternativas online e (ii) a falta de um SGD em regiões vizinhas ou a nível nacional. Os resultados demonstram ainda que a importância atribuída às funcionalidades específicas de um SGD pelos agentes turísticos de um destino é influenciada positivamente (i) pelos seus recursos e visão estratégica, (ii) pelo seu conhecimento sobre as iniciativas da OGD no âmbito das Tecnologias de Informação e Comunicação, (iii) por ser membro afiliado da OGD; e (iv) pelo subsetor do agente turístico, observando-se que os fornecedores de alojamento turístico valorizam menos as funcionalidades de cariz colaborativo do que outro tipo de agentes. A tese termina com conclusões e implicações para o setor do turismo, principalmente para agentes responsáveis pelo desenvolvimento turístico.Programa Doutoral em Turism

A theoretical and computational basis for CATNETS

The main content of this report is the identification and definition of market mechanisms for Application Layer Networks (ALNs). On basis of the structured Market Engineering process, the work comprises the identification of requirements which adequate market mechanisms for ALNs have to fulfill. Subsequently, two mechanisms for each, the centralized and the decentralized case are described in this document. These build the theoretical foundation for the work within the following two years of the CATNETS project. --Grid Computing

Theoretical and Computational Basis for Economical Ressource Allocation in Application Layer Networks - Annual Report Year 1

This paper identifies and defines suitable market mechanisms for Application Layer Networks (ALNs). On basis of the structured Market Engineering process, the work comprises the identification of requirements which adequate market mechanisms for ALNs have to fulfill. Subsequently, two mechanisms for each, the centralized and the decentralized case are described in this document. --Grid Computing

A communicative model for stakeholder consultation: towards a framework for action inquiry in tourism I.T.

A thesis submitted for the degree of Doctor of Philosophy of the University of BedfordshireThis thesis focuses on an under-researched area of tourism -the multi stakeholder, inter organisational business to business Tourism IT domain which exhibits a marked rate of failure. A critical review of B2B case studies reveals that this failure is in large part due to the primacy afforded to technical problem solving approaches over human centred ones. The main purpose of the research is therefore stated as: "how do we ensure that, as technological solutions are implemented within this domain, due consideration is given to human-centred issues?" In order to tackle this research problem an interdisciplinary approach is taken and a communicative model for stakeholder consultation is developed. At the centre of the model lies an innovative method for deconstructing and reconstructing stakeholder discourse. A Co-operative Inquiry research methodology was used and a significant number of stakeholders were engaged in an Open Space event sponsored by two major Tourism IT companies who wanted to investigate the issues and opportunities connected with travel distribution and technology. This was followed up with face to face interviews and live discussions over the internet. In addition stakeholder discourse was captured via the Travelmole tourism discussion site. The discourse between stakeholders was reconstructed and the normative and objective claims analysed in depth. The presentation of these reconstructions in textual, tabular and diagrammatic formats captures the complexity of stakeholder interactions, revealing that although IT is an important tool, what really lies at the core of multi stakeholder projects are the normative positions to which participants subscribe. The model provided a practical means for critiquing stakeholder discourse, helping to identify stakeholders both involved and affected by the issue; juxtaposing the 'is' against the 'ought'; and enabling critical reflection on the coercive use of power. The review of the tourism literature revealed that these issues are as important in general B2B tourism partnerships as in Tourism IT and in this respect the model provides a practical tool for critique and for enabling the formation of a shared normative infrastructure on which multi stakeholder projects can proceed. In addition, while borrowing from Management Science, this thesis also makes a contribution to it, specifically in the area of boundary critique, through the way in which Habermas' ideal speech criteria arc practically implemented

An environment to support negotiation and contracting in collaborative networks

During the last years, manufacturing and service industries faced a global change in the production paradigm. They have to continuously adapt their operating principles in reaction to new business or collaboration opportunities, where a natural reaction is a shift to a new business paradigm with the creation of strategic alliances for product or services development, but also for innovative and emergent business services design. On one hand, the process of creating such alliances can be rather simple if organizations share the same geographical and cultural context. But on the other hand, considering different conditions, there might be a low success rate in the creation of successful consortia. One known reason for such low rate are the delays resulting from negotiations in the establishment of collaboration commitments, represented by contracts or agreements, which are crucial in the creation of such alliances. The collaborative networks discipline covers the study of networks of organizations specially when supported by computer networks. This thesis contributes with research in this field describing the creation process of virtual organizations, and proposing a negotiation support environment to help participants in the negotiation of the consortia creation process and in the co-design of new business services. A negotiation support environment is therefore proposed and described with its main requirements, adopted negotiation protocol, conceptual architecture, models, and software environment. To demonstrate the feasibility of the implementation of the proposed systems, a proof-ofconcept software prototype was implemented and tested using some specific scenarios. This thesis work has been validated adopting a methodology that includes: (i) validation in the research community; (ii) validation in a solar industry network; and (iii) validation by comparison analysis

A Framework for Argumentation-Based Agent Negotiation in Uncertain Settings

Automated negotiation technologies are being increasingly used in business applications, especially in the e-Commerce domain. Argumentation-Based Negotiation (ABN), among the existing approaches, has been distinguished as a powerful approach to automated negotiation due to its ability to provide more sophisticated information (arguments) that justifies and supports agents’ proposals in order to mutually influence their preference relations on the set of offers, and consequently on the negotiation outcome. During the recent years, argumentation-based negotiation has received a considerable attention in the area of agent communication. However, current proposals are mostly concerned with presenting protocols for showing how agents can interact with each other, and how arguments and offers can be generated, evaluated and exchanged under the assumption of certainty. Therefore, none of these proposals is directly targeting the agents’ uncertainty about the selection of their moves nor designing the appropriate negotiation strategies based on this uncertainty in order to help the negotiating agents better make their decisions in the negotiation settings where agents have limited or uncertain information, precluding them from making optimal individual decisions. In this thesis, we tackle the aforementioned problems by advocating an Argumentation-Based Agent Negotiation (ABAN) framework that is capable of handling the problem of agents’ uncertainty during the negotiation process. We begin by proposing an argumentation framework enriched with a new element called agent’s uncertainty as an important parameter in the agent theory to allow negotiating agents to decide which moves to play and reason about the selection of these moves under the assumption of uncertainty. Then, a method for agents’ uncertainty assessment is presented. In particular, we use Shannon entropy to assess agent’s uncertainty about their moves at each dialogue step as well as for the whole dialogue. Negotiation strategies and agent profiles issues are also explored and a methodology for designing novel negotiation strategies and agent profiles under the assumption of uncertainty is developed. Moreover, two important outcome properties namely, completeness and Nash equilibrium are discussed. Finally, the applicability of our framework is explored through several scenarios of the well-known Buyer/Seller case study. The obtained empirical results confirm the effectiveness of using our uncertainty-aware techniques and demonstrate the usefulness of using such techniques in argumentation-based negotiations