1,720,959 research outputs found
Quality analysis of composed services through fault injection
No full textWeb service composition can be adopted to
develop information systems through integration of services
to obtain complex composed services. While interfaces of
services are known at composition time, the quality of a
composed service may depend on the ability of its
component services to react to unforeseen situations, such
as data quality problems and service coordination problems.
In this work, we propose an approach to analyze the quality
of composed services using fault injection techniques, by
inspecting the reaction of a composed process to injected
faults; the aim is to assess the process quality in terms of
fault monitoring and, more generally, fault tolerance
capabilities. The component services are analyzed either
as black-boxes, when only input and output messages are
considered or as white-boxes, when data sources used by
services are considered. A test bed is illustrated on a
selected example, and results of extensive testing are
discussed and framed into a process analysis methodology
Strategies for Risk Facing in Work Environments
No full textRisk management in work environments requires the introduction of mechanisms able to identify the causes and the indications, which precede accidents in order to avoid them whenever this is possible. Most of the accidents are announced by risk events, which may be identified and managed before their evolution into accidents through preventive strategies. We propose to address risks by proposing risk management strategies where the risk is explicitly defined and revealing and protection devices generate risk events managed through conditions and set of actions
A Quality Driven Web Service Selection Model
No full textThe chapter introduces a quality of Web service model which can be exploited by a Web service broker during the Web service selection phase. The model considers both user and provider standpoints. On the one hand, providers express their capabilities with respect to measurable dimensions (e.g., response time, latency). On the other hand, users can define the requirements with a higher level of abstraction (e.g. performance). Since the quality is subjective by definition, the presented quality model also maps the user preferences, i.e., how much a quality dimension is more important than another one in evaluating the overall quality. The Analytic Hierarchy Approach (AHP) has been adopted as a technique for expressing user preferences. The chapter also describes how the model can be exploited in the Web service selection process. Starting from a set of functionally equivalent Web services, the selection process identifies which are the Web services able to satisfy the user requirements. Moreover, according to a cost-benefit analysis, the list of selected Web services is sorted and, as a consequence, the best Web service is identified
“Simulation of Risks for Monitoring and Prevention”,
No full textThis paper deals with a tool developed to support training and education in the field of security and safety in work areas, plants, or industrial environments. The tool comprises the dashboards enabling administrators and users to simulate risks and accidents to be ready for interventions in case of occurrence. Based on a computational model of risks, able to identify the causes and the signs/indications which precede accidents, and to enact prevention mechanisms, and to execute repair actions in order to avoid accidents, this paper presents a Risk Simulation Management (RSM) system and its functioning on some examples
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
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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