Procedia Computer Science

article

A new asymptotic approximate model for the Vlasov-Maxwell equations

F. Assous, F. Tsipis

Procedia Computer Science > 2010 > 1 > 1 > 691-698

In this paper, we derive a new asymptotic approximation of the Vlasov-Maxwell equations. This formulation follows the beam in a speed-of-light frame. It is fourth order accurate in the small characteristic velocity of the beam. The formulation is simpler than standard particle-in-cell methods in the lab frame or in the beam frame. It promises to be very powerful in its ability to get an accurate,...

article

The CMS data aggregation system

Valentin Kuznetsov, Dave Evans, Simon Metson

Procedia Computer Science > 2010 > 1 > 1 > 1535-1543

Meta-data plays a significant role in large modern enterprises, research experiments and digital libraries where it comes from many different sources and is distributed in a variety of digital formats. It is organized and managed by constantly evolving software using both relational and non-relational data sources. Even though we can apply an information retrieval approach to non-relational data sources,...

article

Iterative learning control of dynamic memory caching to enhance processing performance on java platform

Mutlu Ercan, Tankut Acarman

Procedia Computer Science > 2010 > 1 > 1 > 407-416

In this study, computing system performance enhancement by dynamic memory scheduling has been presented. CPU processing time of the computing systems has been enhanced by classifying the arriving computing jobs on an “intelligent manner” and dynamically caching them in a limited memory space. In some special computing areas, like insurance risk investigation, calculations of income and premium need...

article

Towards experimental design using a Bayesian framework for parameter identification in dynamic intracellular network models

Andrei Kramer, Nicole Radde

Procedia Computer Science > 2010 > 1 > 1 > 1645-1653

Biological measurements of intracellular regulation processes are typically noisy, and time resolution is low. In practice often only steady state measurements of perturbation experiments are available. Since data acquisition is expensive, a framework for experimental design that allows the inclusion of prior knowledge and takes uncertainty into account is highly desirable. We introduce a framework...

article

Processes of dispersion of working liquid jets in electro droplet-jet technology: numerical simulation

N. Kondrashov, V. Nagorniy, A. Schmidt, A. Smirnovskii

Procedia Computer Science > 2010 > 1 > 1 > 719-724

The essence of the Electro Droplet-Jet Technology (EDJT) consists of the production of a linear sequence of monodisperse droplets of a fluid, separated from each other by equal distances. Numerical simulation of a liquid jet dispersion and a two-phase droplet flow problem were performed. The effect of the computational mesh on the predictions was investigated; in particular, the influence of the angle...

article

Numerical solution of level dependent quasi-birth-and-death processes

Hendrik Baumann, Werner Sandmann

Procedia Computer Science > 2010 > 1 > 1 > 1561-1569

We consider the numerical computation of stationary distributions for level dependent quasi-birth-and-death processes. An algorithm based on matrix continued fractions is presented and compared to standard solution techniques. Its computational efficiency and numerical stability is demonstrated by numerical examples.

article

FADAlib: an open source C++ library for fuzzy array dataflow analysis

Marouane Belaoucha, Denis Barthou, Adrien Eliche, Sid-Ahmed-Ali Touati

Procedia Computer Science > 2010 > 1 > 1 > 2075-2084

Ubiquitous multicore architectures require that many levels of parallelism have to be found in codes. Dependence analysis is the main approach in compilers for the detection of parallelism. It enables vectorisation and automatic parallelisation, among many other optimising transformations, and is therefore of crucial importance for optimising compilers.This paper presents new open source software,...

article

A platform independent communication library for distributed computing

Derek Groen, Steven Rieder, Paola Grosso, Cees de Laat, more

Procedia Computer Science > 2010 > 1 > 1 > 2699-2706

We present MPWide, a platform independent communication library for performing message passing between supercomputers. Our library couples several local MPI applications through a long distance network using, for example, optical links. The implementation is deliberately kept light-weight, platform independent and the library can be installed and used without administrative privileges. The only requirements...

article

A general model for the generation and scheduling of parameter sweep experiments in computational grid environments

Javier Díaz, Sebastián Reyes, Rosa M. Badia, Alfonso Niño, more

Procedia Computer Science > 2010 > 1 > 1 > 565-572

Parameter sweep experiments (PSE) involve several issues. In this work, we consider two of them: the generation of the parameters space and the scheduling of the associated tasks. Thus, we propose a general model to generate the parameters space of any PSE applying the Nested Summation Symbol operator. On the other hand, for the scheduling of these kinds of problems, we test an adaptive scheduling...

article

Raising the order of multivariate approximation schemes using supplementary derivative data

Dirk Kraaijpoel, Tristan van Leeuwen

Procedia Computer Science > 2010 > 1 > 1 > 307-316

We propose a generic procedure to raise the approximation order of multivariate approximation schemes using supplementary derivative data. The procedure applies to all schemes that reproduce polynomials to a certain degree, including most common types of (quasi-) interpolation and moving least-squares. For an approximation scheme of order m and a dataset that provides n supplementary orders of derivative...

article

A two scale model of air corona discharges

Pierre Seimandi, Guillaume Dufour, François Rogier

Procedia Computer Science > 2010 > 1 > 1 > 627-635

This paper deals with the modelling of plasma discharges induced by electrohydrodynamic actuators. We propose a multi-model method based on fluid conservation equations that allows an increase of the maximum time step imposed by usual explicit schemes. The idea consists in replacing the numerical integration of the plasma equations at the vicinity of the electrodes–where the time step is particularly...

article

Multi-fidelity design optimization of transonic airfoils using shape-preserving response prediction

Leifur Leifsson, Slawomir Koziel

Procedia Computer Science > 2010 > 1 > 1 > 1311-1320

A computationally efficient methodology for transonic airfoil design optimization is presented. Our approach exploits a corrected physics-based low-fidelity surrogate that replaces, in the optimization process, an accurate but computationally expensive highfidelity airfoil model. Correction of the low-fidelity model is achieved by aligning its corresponding airfoil surface pressure distributions with...

article

Cognitive network dynamics in chatlines

Andrea Guazzini, Pietro Lió, Franco Bagnoli, Andrea Passarella, more

Procedia Computer Science > 2010 > 1 > 1 > 2355-2362

Beyond their common use for interpersonal communication, chatlines (also chatrooms) can be formalised as dynamic systems with heuristics. We have studied chatlines in the framework of social networks. The design and data analysis of chatlines opens a new interesting research direction in social network studies. It provides the opportunity of studying the dynamics of human social behaviour in experimental...

article

Forecast sensitivity to the observation error covariance in variational data assimilation

Dacian N. Daescu

Procedia Computer Science > 2010 > 1 > 1 > 1277-1285

The development of the adjoint of the forecast model and of the adjoint of the data assimilation system (adjointDAS) make feasible the evaluation of the derivative-based forecast sensitivity to DAS input parameters in numerical weather prediction (NWP). The adjoint estimation of the forecast sensitivity to the observation error covariance in the DAS is considered as a practical approach to provide...

article

Application of the numerical density-enthalpy method to the multi-phase flow through a porous medium

Ibrahim, F.J. Vermolen, C. Vuik

Procedia Computer Science > 2010 > 1 > 1 > 781-790

In this paper we apply a new method to solve multi-phase fluid flow problem for 1D and 2D fluid systems. This method is developed at TNO and presented in [1] for spatially homogeneous systems. We call this method the numerical density-enthalpy method (or ρ-h method) because density-enthalpy phase diagrams (or ρ-h diagrams) play an important role in it. Finite elements are used for spatial discretization...

article

Knowledge extraction from multiple criteria linear programming classification approach

Yuejin Zhang, Peng Zhang, Lingling Zhang, Yong Shi

Procedia Computer Science > 2010 > 1 > 1 > 2441-2448

As an effective model for classification, Multiple Criteria Linear Programming (MCLP) has been widely used in business intelligence. However, a possible limitation of MCLP is that it generates unexplainable black-box models which can only tell us results without reasons. To overcome this shortage, in this paper, we present a knowledge mining strategy which mines explainable decision rules from black-box...

article

Ridge regression ensemble for toxicity prediction

Marcin Budka, Bogdan Gabrys

Procedia Computer Science > 2010 > 1 > 1 > 193-201

Traditional methods of assessing chemical toxicity of various compounds require tests on animals, which raises ethical concerns and is expensive. Current legislation may lead to a further increase of demand for laboratory animals in the next years. As a result, automatically generated predictions using Quantitative Structure–Activity Relationship (QSAR) modelling approaches appear as an attractive...

article

CyberInfrastructures of cyber-applications-systems

Frederica Darema

Procedia Computer Science > 2010 > 1 > 1 > 1287-1296

The paper discusses foundational notions and conditions in complex applications modeling and in software frameworks to support advanced CyberInfrastructure environments such as those implied and required for Dynamic Data Driven Applications Systems, as well as other classes of applications, collectively referred to here as Cyber-Applications-Systems. The paper discusses considerations of dynamic invocation...

article

Coupling visualization and data analysis for knowledge discovery from multi-dimensional scientific data

Oliver Rübel, Sean Ahern, E. Wes Bethel, Mark D. Biggin, more

Procedia Computer Science > 2010 > 1 > 1 > 1757-1764

Knowledge discovery from large and complex scientific data is a challenging task. With the ability to measure and simulate more processes at increasingly finer spatial and temporal scales, the growing number of data dimensions and data objects presents tremendous challenges for effective data analysis and data exploration methods and tools. The combination and close integration of methods from scientific...

article

Active learning processes to study memory hierarchy on Multicore systems

John Corredor, Juan Carlos Moure, Dolores Rexachs, Daniel Franco, more

Procedia Computer Science > 2010 > 1 > 1 > 921-930

A current challenge for computer users is to fully exploit performance of new Multicore systems. We propose a methodology for students in computational science to analyze the effect of memory hierarchy on application performance. The analysis is proposed in a experimental environment consisting of different systems with different configurations of memory hierarchy. New Multicore systems put tremendous...

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Procedia Computer Science

A new asymptotic approximate model for the Vlasov-Maxwell equations

The CMS data aggregation system

Iterative learning control of dynamic memory caching to enhance processing performance on java platform

Towards experimental design using a Bayesian framework for parameter identification in dynamic intracellular network models

Processes of dispersion of working liquid jets in electro droplet-jet technology: numerical simulation

Numerical solution of level dependent quasi-birth-and-death processes

FADAlib: an open source C++ library for fuzzy array dataflow analysis

A platform independent communication library for distributed computing

A general model for the generation and scheduling of parameter sweep experiments in computational grid environments

Raising the order of multivariate approximation schemes using supplementary derivative data

A two scale model of air corona discharges

Multi-fidelity design optimization of transonic airfoils using shape-preserving response prediction

Cognitive network dynamics in chatlines

Forecast sensitivity to the observation error covariance in variational data assimilation

Application of the numerical density-enthalpy method to the multi-phase flow through a porous medium

Knowledge extraction from multiple criteria linear programming classification approach

Ridge regression ensemble for toxicity prediction

CyberInfrastructures of cyber-applications-systems

Coupling visualization and data analysis for knowledge discovery from multi-dimensional scientific data

Active learning processes to study memory hierarchy on Multicore systems

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