9,582 research outputs found
Run-time Support to Manage Architectural Variability Speci ed with CVL
The execution context in which pervasive systems or mobile
computing run changes continuously. Hence, applications for these systems
should be adapted at run-time according to the current context.
In order to implement a context-aware dynamic reconfiguration service,
most approaches usually require to model at design-time both the list of
all possible configurations and the plans to switch among them. In this
paper we present an alternative approach for the automatic run-time generation
of application configurations and the reconfiguration plans. The
generated configurations are optimal regarding di erent criteria, such as
functionality or resource consumption (e.g. battery or memory). This is
achieved by: (1) modelling architectural variability at design-time using
Common Variability Language (CVL), and (2) using a genetic algorithm
that finds at run-time nearly-optimal configurations using the information
provided by the variability model. We also specify a case study
and we use it to evaluate our approach, showing that it is efficient and
suitable for devices with scarce resources.Campus de Excelencia Internacional Andalucia Tech y proyectos de investigación TIN2008-01942, P09-TIC-5231 and INTER-TRUST FP7-317731
A fast ILP-based Heuristic for the robust design of Body Wireless Sensor Networks
We consider the problem of optimally designing a body wireless sensor
network, while taking into account the uncertainty of data generation of
biosensors. Since the related min-max robustness Integer Linear Programming
(ILP) problem can be difficult to solve even for state-of-the-art commercial
optimization solvers, we propose an original heuristic for its solution. The
heuristic combines deterministic and probabilistic variable fixing strategies,
guided by the information coming from strengthened linear relaxations of the
ILP robust model, and includes a very large neighborhood search for reparation
and improvement of generated solutions, formulated as an ILP problem solved
exactly. Computational tests on realistic instances show that our heuristic
finds solutions of much higher quality than a state-of-the-art solver and than
an effective benchmark heuristic.Comment: This is the authors' final version of the paper published in G.
Squillero and K. Sim (Eds.): EvoApplications 2017, Part I, LNCS 10199, pp.
1-17, 2017. DOI: 10.1007/978-3-319-55849-3\_16. The final publication is
available at Springer via http://dx.doi.org/10.1007/978-3-319-55849-3_1
Liquidity Shocks and Order Book Dynamics
We propose a dynamic competitive equilibrium model of limit order trading, based on the premise that investors cannot monitor markets continuously. We study how limit order markets absorb transient liquidity shocks, which occur when a significant fraction of investors lose their willingness and ability to hold assets. We characterize the equilibrium dynamics of market prices, bid-ask spreads, order submissions and cancelations, as well as the volume and limit order book depth they generate.
Coordination approaches and systems - part I : a strategic perspective
This is the first part of a two-part paper presenting a fundamental review and summary of research of design coordination and cooperation technologies. The theme of this review is aimed at the research conducted within the decision management aspect of design coordination. The focus is therefore on the strategies involved in making decisions and how these strategies are used to satisfy design requirements. The paper reviews research within collaborative and coordinated design, project and workflow management, and, task and organization models. The research reviewed has attempted to identify fundamental coordination mechanisms from different domains, however it is concluded that domain independent mechanisms need to be augmented with domain specific mechanisms to facilitate coordination. Part II is a review of design coordination from an operational perspective
Supporting the Optimized Execution of Business Processes through Recommendations
In order to be able to flexibly adjust a company’s business
processes (BPs) there is an increasing interest in flexible Process-Aware
Information Systems (PAISs). This increasing flexibility, however, typically
implies decreased user guidance by the PAIS and thus poses additional
challenges to its users. This work proposes a recommendation
system which assists users during process execution to optimize performance
goals of the processes. The recommendation system is based on a
constraint-based approach for planning and scheduling the BP activities
and considers both the control-flow and the resource perspective.Ministerio de Ciencia e Innovación TIN2009-1371
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