1,720,968 research outputs found
Real-time and distributed computing in emerging applications. Foreword by the general chairs of Reaction 2012
No full textChallenges in real-time virtualization and predictable cloud computing
No full textCloud computing and virtualization technology have revolutionized general-purpose computing applications in the past decade. The cloud paradigm offers advantages through reduction of operation costs, server consolidation, flexible system configuration and elastic resource provisioning. However, despite the success of cloud computing for general-purpose computing, existing cloud computing and virtualization technology face tremendous challenges in supporting emerging soft real-time applications such as online video streaming, cloud-based gaming, and telecommunication management. These applications demand real-time performance in open, shared and virtualized computing environments. This paper identifies the technical challenges in supporting real-time applications in the cloud, surveys recent advancement in real-time virtualization and cloud computing technology, and offers research directions to enable cloud-based real-time applications in the future
12th IEEE International Conference on Industrial Informatics, INDIN 2014, Porto Alegre, RS, Brazil, July 27-30, 2014
No full textA QoS registry for adaptive real-time service-oriented applications
No full textReal-time service-oriented applications are charac- terized by Quality of Service (QoS) requirements that cannot be properly managed by using classical real-time systems methodologies. In dynamic environments the QoS management can effectively leverage adaptive techniques, that provide flexibility and do not require a complex offline analysis. In turn, such techniques make a massive use of on-line collected data regarding the application performance and the resource requirements. Moreover, a common issue for adaptive systems is the one of deciding the initial configuration of the application and/or the run-time environment at the time of service instantiation. In this paper, we propose a QoS registry for coping with these issues and supporting the configuration of proper scheduling parameters in real-time Service Oriented Architectures (SOAs). The registry permits to gather QoS data related to different functional behaviors of applications, to predict the future trend based on data already collected and to permanently store such data for an effective reuse at the time of future re-instantiations. We have also built an implementation of such registry, computed its overhead costs and performed some experiments for showing the effectiveness in auto-tuning resource allocations for providing QoS guarantees in a real-time SOA
Time-Sensitive Adaptation in CPS through Run-Time Configuration Generation and Verification
No full textThe inherent dynamic nature of Cyber Physical Systems (CPS) requires novel mechanisms to support their evolution over their operation life time. Though typically the development of CPS integrates the software (cyber) design with the physical domain, this contribution concentrates mainly on another essential integration plane: The software design level. This paper presents an approach to support the adaptation process of CPS required by their evolution. It is based on the run-time generation of verified system configurations and their analysis to guide the evolution of the system through correct configurations that meet the functional and timing requirements of the new situations. We show its feasibility by presenting and analyzing the results of the execution for a reduced-scale time-sensitive application that employs a complex verification technique to model functional and temporal aspects of the system.</p
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
Integrating multicore awareness functions into distribution middleware for improving performance of distributed audio surveillance
Full text link[EN] This paper describes an approach to improve the performance of the distributed audio-processing functions for
audio surveillance systems. In order to increase portability, current distributed audio-processing uses the default
capacities offered by the underlying scheduling facilities of the operating system. In this approach, a set of
capacities are added to the distribution software that enable the reduction of the distributed processing time of
audio frames at the server side by adding functions that utilize the underlying hardware resources including
exclusive core reservation. By loosing some generality in the design of the distribution software, it is possible to
increase performance and provide better isolation to selected audio tasks in the presence of other competing
software tasks. The approach is designed and implemented as well as analyzed on general purpose computers
with a server-client architecture using serial scheduling of the audio tasks and parallelizing the digital signal
processing computations. The proposed solution is implemented and analyzed showing benefits in performance
and robustness over single threaded audio processing. The resulting system is significantly more robust in the
presence of other competing software tasks (noise). These results directly yield the possibility to manage more
concurrent audio streams at the server side.This work has been partly funded by the Spanish Ministry of
Economy and Competitiveness under grant TIN2017-86520-C3-2-R
(Predictable and trustable computer systems for Industry 4.0). I wish to
acknowledge the work of Antonio Pastor in the programming of the
experiments and data gathering.Garcia Valls, MS. (2019). Integrating multicore awareness functions into distribution middleware for improving performance of distributed audio surveillance. Advances in Engineering Software (Online). 132:92-100. https://doi.org/10.1016/j.advengsoft.2019.01.003S9210013
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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