1,721,023 research outputs found
Three Categories of Context-Aware Systems
Full text linkWith regard to context-aware systems: some optimize system-internal processes, based on the context state at hand; others maximize the user-perceived effectiveness of delivered services, by providing different service variants depending on the situation of the user; still others are about offering value-sensitivity when the society demands so. Even though those three perspectives cover a broad range of currently relevant applications there are no widely accepted and commonly used corresponding concepts and terms. This is an obstacle to broadly understand, effectively integrate, and adequately assess such systems. We address this problem, by considering a (component-based) methodological derivation of technical (software) specifications based on underlying enterprise models. That is because context states are about the enterprise environment of a (software) system while the delivery of context-aware services is about technical (software) functionalities; hence, we need a perspective on both. We consider the SDBC (Software Derived from Business Components) approach that brings together enterprise modeling and software specification. On that basis: (a) We deliver a base context-awareness conceptualization; (b) We partially align it to agent technology because adapting behaviors to environments assumes some kind of pro-activity that is only fully covered by agent systems, in our view. We partially illustrate our proposed conceptualization and particularly - the agent technology implications, by means of a case example featuring land border security
On-the-Fly Dependable Mediation between Heterogeneous Networked Systems
No full textThe development of next generation Future Internet systems must be capable to address complexity, heterogeneity, interdependency and, especially, evolution of loosely connected networked systems. The European project Connect addresses the challenging and ambitious topic of ensuring eternally functioning distributed and heterogeneous systems through on-the-fly synthesis of the Connectors through which they communicate. In this paper we focus on the Connect enablers that dynamically derive such connectors ensuring the required non-functional requirements via a framework to analyse and assess dependability and performance properties. We illustrate the adaptive approach under development integrating synthesis of Connectors, stochastic model-based analysis performed at design time and run-time monitoring. The proposed framework is illustrated on a case study
Typing Legacy COBOL Code
No full textMaintenance of COBOL applications that still exist and work today is an open issue for many companies that have not yet undertaken the crucial decision of migrating to a modern development platform. And even those who did, most likely had to face a major challenge: understanding what those million lines of code do and what business processes they originally implemented. Automating the task of reconstructing the business logic of programs somehow is hard nonetheless: COBOL code is difficult to even get parsed - let alone applying Program Understanding techniques based on sophisticate deductions over information inferred from the code. Here we propose a system based on the translation of COBOL into a simpler and cleaner language and a type system capable of inferring types of program variables. Being COBOL a language in which variable reuse has been a widespread practice for decades, strong typing rules in the usual sense wouldn’t simply fit, therefore our system provides special flow types for tracking multiple types a variable may assume and follows the program control-flow until no more type-changes occur for variables in the typing context. Alongside it detects also a number of error-prone situations, type mismatches and data corruptions due to misalignment or misfit in variable reuse when types have incompatible in-memory representations, while still guaranteing the typing process does not halt
Document Management for Collaborative E-business: Integrating ebXML Environment and Legacy DMS Barcelona, Spain,
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Making Enterprise Information Systems Resilient Against Disruptive Events: A Conceptual View
No full textEnterprise Information Systems (EIS) are designed to deal with normal variability in their inputs and data. Empowered by CONTEXT-AWARENESS, some EIS even count on sensors and/or data analytics for capturing changes outside of the system. Nevertheless, context-awareness would often fail when EIS are affected by (large-scale) disruptive events, such as disasters, virus outbreaks, or military conflicts. Hence, in the current paper, we take a step forward, by considering context-awareness for disruptive events. We combine context-awareness with risk management techniques, such as FMECA and FTA, that are useful for defining and mitigating risk events. To avoid having to define the likelihood for such very-low-probability disruptive risks, we use CONSEQUENCE-BASED RISK MANAGEMENT rather than traditional risk management. We augment this approach with the context-awareness paradigm, delivering a contribution that is two-fold: (i) We propose context-awareness-related measures and consequence-based-risk-management-related measures, to address disruptive events; (ii) We reflect this in a method featuring the application of context-awareness and risk management for designing robust and resilient EIS.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Policy Analysi
Enterprise Modeling with Conventions
No full textThis paper investigates the use of modeling conventions forenterprise models. With the help of Archi, a tool supporting the Archi-Mate standard, we have enhanced the enterprise modeling process withsemantic modeling conventions that support assessment of enterprisemodels during their design. For enterprise architects who want morefrom ArchiMate than just drawing pictures, this paper proposes to usea language and a tool, Ampersand, to impose and verify modeling conventionsin ArchiMate models. Unlike informal languages, Ampersandallows enterprise architects to signal where an ArchiMate model violatestheir own modeling conventions, so they can fix the model accordingly.It allows enterprise architects to enhance their ArchiMate models withsemantic modeling conventions that are verified by Ampersand. This papercontains a case study that demonstrates the approach. The authorsalso share their experience with modeling with semantic conventions
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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