1,025 research outputs found

    Reacting to Unexpected Events and Communicating in Spite of Mixed Ontologies

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    Finding the Most Similar Concepts in Two Different Ontologies

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    Abstract. A concise manner to send information from agent A to B is to use phrases constructed with the concepts of A: to use the concepts as the atomic tokens to be transmitted. Unfortunately, tokens from A are not understood by (they do not map into) the ontology of B, since in general each ontology has its own address space. Instead, A and B need to use a common communication language, such as English: the transmission tokens are English words. An algorithm is presented that finds the concept cB in OB (the ontology of B) most closely resembling a given concept cA. That is, given a concept from ontology OA, a method is provided to find the most similar concept in OB, as well as the similarity sim between both concepts. Examples are given. 1 Introduction an

    CHORUS Deliverable 2.2: Second report - identification of multi-disciplinary key issues for gap analysis toward EU multimedia search engines roadmap

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    After addressing the state-of-the-art during the first year of Chorus and establishing the existing landscape in multimedia search engines, we have identified and analyzed gaps within European research effort during our second year. In this period we focused on three directions, notably technological issues, user-centred issues and use-cases and socio- economic and legal aspects. These were assessed by two central studies: firstly, a concerted vision of functional breakdown of generic multimedia search engine, and secondly, a representative use-cases descriptions with the related discussion on requirement for technological challenges. Both studies have been carried out in cooperation and consultation with the community at large through EC concertation meetings (multimedia search engines cluster), several meetings with our Think-Tank, presentations in international conferences, and surveys addressed to EU projects coordinators as well as National initiatives coordinators. Based on the obtained feedback we identified two types of gaps, namely core technological gaps that involve research challenges, and “enablers”, which are not necessarily technical research challenges, but have impact on innovation progress. New socio-economic trends are presented as well as emerging legal challenges

    Bringing social reality to multiagent and service architectures : practical reductions for monitoring of deontic-logic and constitutive norms

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    As distributed systems grow in complexity, the interactions among individuals (agents, services) of such systems become increasingly more complex and therefore more difficult to constrain and monitor. We propose to view such systems as socio-technical systems, in which organisational and institutional concepts, such as norms, can be applied to improve not only control on the components but also their autonomy by the definition of soft rather than hard constraints. Norms can be described as rules that guide the behavior of individual agents pertaining to groups that abide to them, either by explicit or implicit support. The study of norms, and regulatory systems in general, in their many forms -e.g. social norms, conventions, laws, regulations- has been of interest since the beginning of philosophy, but has seen a lot of evolution during the 20th century due to the progress in the philosophy of language, especially concerning speech acts and deontic logic. Although there is a myriad of definitions and related terminologies about the concept of norm, and as such there are many perspectives on how to analyse their impact, a common denominator is that norms constrain the behaviour of groups of agents in a way that each individual agent can build, with a fair degree of confidence, expectations on how each of their counterparts will behave in the situations that the norms are meant to cover. For example, on a road each driver expects everybody else to drive on only one side of the road (right or left, depending on the country). Therefore, normative contexts, usually wrapped in the form of institutions, are effective mechanisms to ensure the stability of a complex system such as an organisation, a society, or even of electronic systems. The latter has been an object of interest in the field of Artificial Intelligence, and it has been seen as a paradigm of coordination among electronic agents either in multi-agent systems or in service-oriented architectures. In order to apply norms to electronic systems, research has come up with abstractions of normative systems. In some cases these abstractions are based on regimented systems with flexible definitions of the notion of norm, in order to include meanings of the concept with a coarse-grained level of logic formality such as conventions. Other approaches, on the other hand, propose the use of deontic logic for describing, from a more theoretical perspective, norm-governed interaction environments. In both cases, the purpose is to enable the monitoring and enforcement of norms on systems that include -although not limited to- electronic agents. In the present dissertation we will focus on the latter type, focusing on preserving the deontic aspect of norms. Monitoring in norm-governed systems requires making agents aware of: 1) what their normative context is, i.e. which obligations, permissions and prohibitions are applicable to each of them and how they are updated and triggered; and 2) what their current normative status is, i.e. which norms are active, and in what instances they are being fullfilled or violated, in order words, what their social -institutional- reality is. The current challenge is on designing systems that allow computational components to infer both the normative context and social reality in real-time, based on a theoretical formalism that makes such inferences sound and correct from a philosophical perspective. In the scope of multi-agent systems, many are the approaches proposed and implemented that full these requirements up to this date. However, the literature is still lacking a proposal that is suited to the current state-of-the-art in service-oriented architectures, more focused nowadays on automatically scalable, polyglot amalgams of lightweight services with extremely simple communication and coordination mechanisms- a trend that is being called “microservices”. This dissertation tackles this issue, by 1) studying what properties we can infer from distributed systems that allow us to treat them as part of a socio-technical system, and 2) analysing which mechanisms we can provide to distributed systems so that they can properly act as socio-technical systems. The main product of the thesis is therefore a collection of computational elements required for formally grounded and real-time e¬fficient understanding and monitoring of normative contexts, more specially: 1. An ontology of events to properly model the inputs from the external world and convert them into brute facts or institutional events; 2. A lightweight language for norms, suitable for its use in distributed systems; 3. An especially tailored formalism for the detection of social reality, based on and reducible to deontic logic with support for constitutive norms; 4. A reduction of such formalism to production rule systems; and 5. One or more implementations of this reduction, proven to e¬fficiently work on several scenarios. This document presents the related work, the rationale and the design/implementation of each one of these elements. By combining them, we are able to present novel, relevant work that enables the application of normative reasoning mechanisms in realworld systems in the form of a practical reasoner. Of special relevance is the fact that the work presented in this dissertation simplifies, while preserving formal soundness, theoretically complex forms of reasoning. Nonetheless, the use of production systems as the implementation-level materialisation of normative monitoring allows our work to be applied in any language and/or platform available, either in the form of rule engines, ECA rules or even if-then-else patterns. The work presented has been tested and successfully used in a wide range of domains and actual applications. The thesis also describes how our mechanisms have been applied to practical use cases based on their integration into distributed eldercare management and to commercial games.Con el incremento en la complejidad de los sistemas distribuidos, las interacciones entre los individuos (agentes, servicios) de dichos sistemas se vuelven más y más complejas y, por ello, más difíciles de restringir y monitorizar. Proponemos ver a estos sistemas como sistemas socio-técnicos, en los que conceptos organizacionales e institucionales (como las normas) pueden aplicarse para mejorar no solo el control sobre los componentes sino también su autonomía mediante la definición de restricciones débiles (en vez de fuertes). Las Normas se pueden describir como reglas que guían el comportamiento de agentes individuales que pertenecen a grupos que las siguen, ya sea con un apoyo explícito o implícito. El estudio de las normas y de los sistemas regulatorios en general y en sus formas diversas -normas sociales, convenciones, leyes, reglamentos- ha sido de interés para los eruditos desde los inicios de la filosofía, pero ha sufrido una evolución mayor durante el siglo 20 debido a los avances en filosofía del lenguaje, en especial los relacionados con los actos del habla -speech acts en inglés- y formas deónticas de la lógica modal. Aunque hay una gran variedad de definiciones y terminología asociadas al concepto de norma, y por ello existen varios puntos de vista sobre como analizar su impacto, el denominador común es que las normas restringen el comportamiento de grupos de agentes de forma que cada agente individual puede construir, con un buen nivel de confianza, expectativas sobre cómo cada uno de los otros actores se comportará en las situaciones que las normas han de cubrir. Por ejemplo, en una carretera cada conductor espera que los demás conduzcan solo en un lado de la carretera (derecha o izquierda, dependiendo del país). Por lo tanto, los contextos normativos, normalmente envueltos en la forma de instituciones, constituyen mecanismos efectivos para asegurar la estabilidad de un sistema complejo como una organización, una sociedad o incluso un sistema electrónico. Lo último ha sido objeto de estudio en el campo de la Inteligencia Artificial, y se ha visto como paradigma de coordinación entre agentes electrónicos, tanto en sistemas multiagentes como en arquitecturas orientadas a servicios. Para aplicar normas en sistemas electrónicos, los investigadores han creado abstracciones de sistemas normativos. En algunos casos estas abstracciones se basan en sistemas regimentados con definiciones flexibles del concepto de norma para poder influir algunos significados del concepto con un menor nivel de granularidad formal como es el caso de las convenciones. Otras aproximaciones proponen el uso de lógica deóntica para describir, desde un punto de vista más teórico, entornos de interacción gobernados por normas. En ambos casos el propósito es el permitir la monitorización y la aplicación de las normas en sistemas que incluyen -aunque no están limitados a- agentes electrónicos. En el presente documento nos centraremos en el segundo tipo, teniendo cuidado en mantener el aspecto deóntico de las normas. La monitorización en sistemas gobernados por normas requiere el hacer a los agentes conscientes de: 1) cual es su contexto normativo, es decir, que obligaciones permisos y prohibiciones se aplican a cada uno de ellos y cómo se actualizan y activan; y 2) cual es su estado normativo actual, esto es, que normas están activas, y que instancias están siendo cumplidas o violadas, en definitiva, cual es su realidad social -o institucional-. En la actualidad el reto consiste en diseñar sistemas que permiten inferir a componentes computacionales tanto el contexto normativo como la realidad social en tiempo real, basándose en un formalismo teórico que haga que dichas inferencias sean correctas y bien fundamentadas desde el punto de vista filosófico. En el ámbito de los sistemas multiagente existen muchas aproximaciones propuestas e implementadas que cubren estos requisitos. Sin embargo, esta literatura aun carece de una propuesta que sea adecuada para la tecnología de las arquitecturas orientadas a servicios, que están más centradas en amalgamas políglotas y escalables de servicios ligeros con mecanismos de coordinación y comunicación extremadamente simples, una tendencia moderna que lleva el nombre de microservicios. Esta tesis aborda esta problemática 1) estudiando que propiedades podemos inferir de los sistemas distribuidos que nos permitan tratarlos como parte de un sistema sociotécnico, y 2) analizando que mecanismos podemos proporcionar a los sistemas distribuidos de forma que puedan actuar de forma correcta como sistemas socio-técnicos. El producto principal de la tesis es, por tanto, una colección de elementos computacionales requeridos para la monitorización e interpretación e_cientes en tiempo real y con clara base formal. En concreto: 1. Una ontología de eventos para modelar adecuadamente las entradas del mundo exterior y convertirlas en hechos básicos o en eventos institucionales; 2. Un lenguaje de normas ligero y sencillo, adecuado para su uso en arquitecturas orientadas a servicios; 3. Un formalismo especialmente adaptado para la detección de la realidad social, basado en y reducible a lógica deóntica con soporte para normas constitutivas; 4. Una reducción de ese formalismo a sistemas de reglas de producción; y 5. Una o más implementaciones de esta reducción, de las que se ha probado que funcionan eficientemente en distintos escenarios. Este documento presenta el estado del arte relacionado, la justificación y el diseño/implementación para cada uno de esos elementos. Al combinarlos, somos capaces de presentar trabajo novedoso y relevante que permite la aplicación de mecanismos de razonamiento normativo en sistemas del mundo real bajo la forma de un razonador práctico. De especial relevancia es el hecho de que el trabajo presentado en este documento simplifica formas complejas y teóricas de razonamiento preservando la correctitud formal. El uso de sistemas de reglas de producción como la materialización a nivel de implementación del monitoreo normativo permite que nuestro trabajo se pueda aplicar a cualquier lenguaje o plataforma disponible, ya sea en la forma de motores de reglas, reglas ECA o incluso patrones si-entonces. El trabajo presentado ha sido probado y usado con éxito en un amplio rango de dominios y aplicaciones prácticas. La tesis describe como nuestros mecanismos se han aplicado a casos prácticos de uso basados en su integración en la gestión distribuida de pacientes de edad avanzada o en el sector de los videojuegos comerciales.Postprint (published version

    Sustainability of systems interoperability in dynamic business networks

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    Dissertação para obtenção do Grau de Doutor em Engenharia Electrotécnica e de ComputadoresCollaborative networked environments emerged with the spread of the internet, contributing to overcome past communication barriers, and identifying interoperability as an essential property to support businesses development. When achieved seamlessly, efficiency is increased in the entire product life cycle support. However, due to the different sources of knowledge, models and semantics, enterprise organisations are experiencing difficulties exchanging critical information, even when they operate in the same business environments. To solve this issue, most of them try to attain interoperability by establishing peer-to-peer mappings with different business partners, or use neutral data and product standards as the core for information sharing, in optimized networks. In current industrial practice, the model mappings that regulate enterprise communications are only defined once, and most of them are hardcoded in the information systems. This solution has been effective and sufficient for static environments, where enterprise and product models are valid for decades. However, more and more enterprise systems are becoming dynamic, adapting and looking forward to meet further requirements; a trend that is causing new interoperability disturbances and efficiency reduction on existing partnerships. Enterprise Interoperability (EI) is a well established area of applied research, studying these problems, and proposing novel approaches and solutions. This PhD work contributes to that research considering enterprises as complex and adaptive systems, swayed to factors that are making interoperability difficult to sustain over time. The analysis of complexity as a neighbouring scientific domain, in which features of interoperability can be identified and evaluated as a benchmark for developing a new foundation of EI, is here proposed. This approach envisages at drawing concepts from complexity science to analyse dynamic enterprise networks and proposes a framework for sustaining systems interoperability, enabling different organisations to evolve at their own pace, answering the upcoming requirements but minimizing the negative impact these changes can have on their business environment

    Moving Home: The Art and Embodiment of Transience Among Youth Emerging from Canadas Child Welfare System

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    Youth who have exited the child welfare system are among the most vulnerable in Canada. Ample research in social sciences disciplines outside of Geography have illustrated the significant likelihood of poorer life outcomes for former youth in care across a variety of indicators. Combining geographies of mobilities, childrens geographies, and emotional geographies, this research seeks to understand the embodied experiences of former youth in care as they relate the transience experienced in care in the past and lived on in the present. Using arts-based, participatory and Indigenous methods this comparative study collaborated with 15 co-researchers from Toronto and Whitehorse ages 18-30 with lived-experience in care. Representations of bodies were complex, partial, and most often created by female-identified co-researchers. An interesting finding was positive representation of and identification with nature and natural elements, while homes and depictions of them hardly present in comparison. Hope for the future and other youth in care emerged as strong theme, and this hope connects to resilience as practiced by co-researchers as a conscious form of resistance. Methodological findings include the compelling nature of the data created by opening up artistic medium to be self-selected. Lastly, policy suggestions for housing and transition supports to be more understanding of the mobility of these young people are discussed

    Critical Moments of Meaning and Being: Narratives of Cancer during Young Adult Life

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    Emerging conversations within oncology have drawn more attention to cancer among young adults (ages 18-45). Recent research has illuminated many of the psychosocial difficulties young adults face as they go through the many trials and tribulations of chronic illness. However, a subject still understudied, much is unclear about the personal as well as the cultural implications of being diagnosed during this period of time. In a book of cancer stories, performer and young adult cancer patient Kairol Rosenthal (2009) expressed her frustration with what she saw as “stereotypes” promulgated by the limited public discourses that exist on the subject (p. 7). She sought to counterbalance these representations with stories capturing the “complexities of our real daily lives” (p. 7). Indeed, in oncological discourses young adults tend to be cast in oversimplified terms, based upon cultural expectations about what young adulthood should be and pressures to conform to those standards. Intersecting with dominant discourses within narrative identity development, two imperatives are placed upon young adults’ stories: integration of different life experiences and selves into a coherent narrative and developing a sense of self-authorship in the direction of one’s life. What seems to be lost in these imperatives within the existing research is what is at stake for individual lives (a phenomenological perspective) and how those stakes are negotiated or contested with hegemonic trajectories of life (a critical perspective). Receptive to Rosenthal’s critique of dominant discourses around cancer and young adulthood, the purpose of this thesis was to explore the complexity and diversity of young adults living with cancer. More specifically, I intended to interrogate some of their existential and biographical challenges as expressed in their narratives of cancer, as well as their engagements with ideological constructions of young adulthood, namely, the expectations of narrative coherence and self-authorship. This research marked a departure from most studies on the subject in its qualitative methodology (i.e., narrative analysis) and in its explicit evaluation of the effects of cultural discourses on young adults’ attempts to make meaning. More generally, this research shows the importance of language—in discourses, narratives, and metaphors—in constructing and communicating illness experiences. For this project, I gathered a mix of written and oral narratives (through semi-structured interviews) from 21 participants from across Canada. The foci of analyses were on what could be called narrative ‘moments of meaning’ and ‘moments of being,’ that is, situated expressions of how they made sense of their worlds and themselves. Many of these were critical moments in the sense of questioning and resisting dominant discourses of cancer and young adulthood. Their moments of meaning often expressed negotiation of personal desires and innovative intentions with familiar cultural narratives or “prototypical plots” (Good, 1994)—including stories of battling cancer, embarking on a life journey, nearing recovery, encountering unpredictability and mystery, and living with chaos. These moments of meaning served an array of purposes well beyond the expected function of constructing a coherent narrative. When telling of identity disruptions and the liminality of cancer, participants produced both more orderly moments of being (e.g., survivor, patient, or warrior identities) and more liminal moments of non-being (e.g., victim, phoenix, or trickster identities). Self-authorship seemed to be present among the former, while the latter expressed less control and certainty of being—which was not always seen as a problem. These moments of being and non-being were collaborated and contested within the intersubjective spaces of their clinical relationships, local worlds, and cancer patient communities. More specific to their age group, their moments of being and non-being often related to what may be understood as developmental identities, including the ‘traditional milestones’ such as individual autonomy, family (i.e., marriage and parenthood), and vocation (i.e., getting an education and building a career). In their struggles they sometimes reaffirmed these cultural ideals toward identity integration and other times resisted them as “normalizing ideologies” (Becker, 1997) of young adulthood. As part of these larger negotiations of meaning and being, the participants expressed struggles to understand the moral significance of their illnesses. Confronted with what may be called “causal ontologies” of suffering (Shweder, 1997), they spoke of different etiological models of cancer’s origins as well as reconciliatory models for living with cancer in the future. Their narratives sometimes led toward “remoralization” (Kleinman, 1988)—couching experiences of suffering in terms of a moral order (narrative coherence) and personal responsibility (self-authorship)—and sometimes led away from it, depending on whether they believed their illnesses originated from events in their personal and social lives. Overall, the participants in this study communicated complex and potentially chronic existential challenges. In many ways their narratives resisted dominant representations of young adults with cancer—and of cancer patients in general—suggesting that such representations need to be rethought. Their critical moments of meaning and being may serve as counternarratives to the stereotypes of concern to Rosenthal and many other cancer patients. Specifically, their narratives revealed the merits and limits of the ideological construction of young adulthood as a time of narrative coherence and self-authorship. This study has important implications for future health research and psychosocial support in the field of oncology; building upon a “narrative medicine” (Charon, 2006), sensitivity to how language is used among young adult cancer patients may lead toward more inclusive clinical practices

    Communication

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    Communication

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    Machine communication - to interact not just via but also with machines - has transformed contemporary communication. It puts us not just in conversation with one another but also with our current machinery. By analyzing the alienness of this computational communication, through a close reading of interfaces and a field study of software development, this volume uncovers what it means to "communicate" today
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