Now showing items 1-20 of 27

    • A fast newton's iteration for M/G/1-type and GI/M/1-type markov chains 

      Pérez, Juan F.; Telek, Miklós; Van Houdt, Benny
      In this article we revisit Newton's iteration as a method to find the G or R matrix in M/G/1-type and GI/M/1-type Markov chains. We start by reconsidering the method proposed in Ref.[ 15 ], which required O(m 6 + Nm 4) ...
       Artículo. 2012
    • A mean field model for an optical switch with a large number of wavelengths and centralized partial conversion 

      Pérez, Juan F.; Van Houdt, Benny
      This paper analyzes an optical switch with centralized partial wavelength conversion by means of a mean field model. The model can be used to approximate the behavior of a switch with a large number of output wavelengths, ...
       Artículo. 2010
    • An offline demand estimation method for multi-threaded applications 

      Pérez, Juan F.; Pacheco-Sanchez, Sergio; Casale, Giuliano
      Parameterizing performance models for multi-threaded enterprise applications requires finding the service rates offered by worker threads to the incoming requests. Statistical inference on monitoring data is here helpful ...
       parte de Libro. 2014
    • Assessing SLA compliance from Palladio component models 

      Pérez, Juan F.; Casale, Giuliano
      Service providers face the challenge of meeting service-level agreements (SLAs) under uncertainty on the application actual performance. The performance heavily depends on the characteristics of the hardware on which the ...
       parte de Libro. 2014
    • Assessing the impact of concurrent replication with canceling in Parallel Jobs 

      Qiu, Zhan; Pérez, Juan F.
      Parallel job processing has become a key feature of many software applications, e.g., in scientific computing. Parallelization allows these applications to exploit large resource pools, such as cloud or grid data centers. ...
       parte de Libro. 2015
    • Beyond the mean in fork-join queues: efficient approximation for response-time tails 

      Qiu, Zhan; Pérez, Juan F.; Harrison, Peter G.
      Fork-join queues are natural models for various computer and communications systems that involve parallel multitasking and the splitting and resynchronizing of data, such as parallel computing, query processing in distributed ...
       Artículo. 2015
    • DICE: Quality-driven development of data-intensive cloud applications 

      Casale, Giuliano; Ardagna, Danilo; Artac, Matej; Barbier, Franck; Di Nitto, Elisabetta; Henry, Alexis; Pérez, Juan F.
      Model-driven engineering (MDE) often features quality assurance (QA) techniques to help developers creating software that meets reliability, efficiency, and safety requirements. In this paper, we consider the question of ...
       parte de Libro. 2015
    • Efficiency analysis in electricity transmission utilities 

      Pérez, Juan F.; Marcucci, Adriana; Pérez, Juan F.; Durán, Hernando; Mutis, Hernando; Taútiva, Camilo; Palacios, Fernando
      n those countries where the electric production chain has been disintegrated, transportation utilities (transmission as well as distribution) are subject to regulation or are under supervised activity. Regulation of ...
       Artículo. 2009
    • Estimating computational requirements in multi-threaded applications 

      Pérez, Juan F.; Casale, Giuliano; Pacheco-Sanchez, Sergio
      Performance models provide effective support for managing quality-of-service (QoS) and costs of enterprise applications. However, expensive high-resolution monitoring would be needed to obtain key model parameters, such ...
       Artículo. 2014
    • Evaluating replication for parallel jobs: an efficient approach 

      Qiu, Zhan; Pérez, Juan F.
      Many modern software applications rely on parallel job processing to exploit large resource pools available in cloud and grid infrastructures. The response time of a parallel job, made of many subtasks, is determined by ...
       Artículo. 2015
    • Filling the gap: a tool to automate parameter estimation for software performance models 

      Wang, Weikun; Pérez, Juan F.; Casale, Giuliano
      Software performance engineering heavily relies on application and resource models that enable the prediction of Quality-of-Service metrics. Critical to these models is the accuracy of their parameters, the value of which ...
       parte de Libro. 2015
    • Holistic workload scaling : A new approach to compute acceleration in the cloud 

      Pérez, Juan F.; Chen, Lydia Y.; Villari, Massimo; Ranjan, Rajiv
      Workload scaling is an approach to accelerating computation and thus improving response times by replicating the exact same request multiple times and processing it in parallel on multiple nodes and accepting the result ...
       Artículo. 2018
    • Impacto de las fusiones y adquisiciones en la eficiencia de la banca en Colombia 

      Sarmiento, Miguel; Mutis, Hernando; Cepeda, Andrés; Pérez , Juan F.
      En este artículo se evalúa la eficiencia de la banca colombiana utilizando modelos de frontera no paramétricos. Los resultados indican que la industria bancaria ha presentado una tendencia creciente en su eficiencia, ...
       Artículo. 2018
    • jPhase: An object-oriented tool for modeling phase-type distributions 

      Pérez, Juan F.; Riaño, Germán
      Phase-Type distributions are a powerful tool in stochastic modeling of real systems. In this paper, we describe an object-oriented tool used to represent and manipulate these distributions as computational objects. It ...
       parte de Libro. 2006
    • Mean field calculation for optical grid dimensioning 

      Van Houdt, Benny; Develder, Chris; Pérez, Juan F.; Pickavet, Mario; Dhoedt, Bart
      For traditional optical network dimensioning, a plethora of algorithms exists to design the amount of network resources required to accommodate a given amount of traffic, expressed as a (source, destination)-based traffic ...
       Artículo. 2010
    • Model-driven design of cloud applications with quality-of-service guarantees: the modaclouds approach, MICAS Tutorial 

      Almeida da Silva, Marcos Aurélio; Ardagna, Danilo; Ferry, Nicolas; Pérez, Juan F.
      The competition between cloud providers has led to an impressive set of cloud solutions offered to consumers. The ability to properly design and deploy multi-cloud applications (i.e., Applications deployed on multiple ...
       parte de Libro. 2015
    • Planning distribution primary feeders for smart-grid operation via network flow analysis 

      Morillo, José L.; Pérez, Juan F.; Quijano, Nicanor; Cadena, Ángela
      Planning the expansion of distribution systems (DS) is a nonlinear and combinatorial problem that combines technical and regulatory constraints. Commonly, the planning of DS is intended to achieve a radial topology to ...
       parte de Libro. 2015
    • Planning open and closed-loop feeders with efficiency analysis 

      Morillo, José L.; Pérez, Juan F.; Quijano, Nicanor; Cadena, Ángela
      The evolution of distribution systems (DS) towards the smart-grid concept posses new challenges, triggered by the integration of distributed generation (DG) and the installation of new devices. These challenges raise the ...
       parte de Libro. 2015
    • QD-AMVA: evaluating systems with queue-dependent service requirements 

      Casale, Giuliano; Pérez, Juan F.; Wang, Weikun
      Workload measurements in enterprise systems often lead to observe a dependence between the number of requests running at a resource and their mean service requirements. However, multiclass performance models that feature ...
       Artículo. 2015
    • Quality-of-service in cloud computing: modeling techniques and their applications 

      Ardagna, Danilo; Casale, Giuliano; Ciavotta, Michele; Pérez, Juan F.; Wang, Weikun
      Recent years have seen the massive migration of enterprise applications to the cloud. One of the challenges posed by cloud applications is Quality-of-Service (QoS) management, which is the problem of allocating resources ...
       Artículo. 2014