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Sparse grids and applications — Stuttgart 2014 3rd

3rd Workshop on Sparse Grids and Applications, SGA 2014

作者： Garcke, Jochen Pflüger, Dirk Institut für Numerische Simulation Universität Bonn Bonn Germany Institute for Parallel and Distributed Systems Universität Stuttgart Stuttgart Germany

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Research Data Management in simulation Science: Infrastructure, Tools, and Applications

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Datenbank-Spektrum 2024年第2期24卷 97-105页

作者： Flemisch, Bernd Hermann, Sibylle Herschel, Melanie Pflüger, Dirk Pleiss, Jürgen Range, Jan Roy, Sarbani Takamoto, Makoto Uekermann, Benjamin Institute for Modelling Hydraulic and Environmental Systems University of Stuttgart Stuttgart Germany Stuttgart Center for Simulation Science University of Stuttgart Stuttgart Germany Institute for Parallel and Distributed Systems University of Stuttgart Stuttgart Germany Institute of Biochemistry and Technical Biochemistry University of Stuttgart Stuttgart Germany NEC Laboratories Europe Heidelberg Germany

Research Data Management (RDM) has gained significant traction in recent years, being essential to allowing research data to be, e.g., findable, accessible, interoperable, and reproducible (FAIR), thereby fostering collaboration or accelerating scientific findings. We present solutions for RDM developed within the DFG-Funded Cluster of Excellence EXC2075 Data-Integrated simulation Science (SimTech). After an introduction to the scientific context and challenges faced by simulation scientists, we outline the general data management infrastructure and present tools that address these challenges. Exemplary domain applications demonstrate the use and benefits of the proposed data management software solutions. These are complemented by additional measures for enablement and dissemination to foster the adoption of these techniques. © The Author(s) 2024.

关键词： Information management

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FEniCS-preCICE: Coupling FEniCS to other simulation software

arXiv

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arXiv 2021年

作者： Rodenberg, Benjamin Desai, Ishaan Hertrich, Richard Jaust, Alexander Uekermann, Benjamin Scientific Computing in Computer Science Department of Informatics Technical University of Munich Germany Usability and Sustainability of Simulation Software Institute for Parallel and Distributed Systems University of Stuttgart Germany Simulation of Large Systems Institute for Parallel and Distributed Systems University of Stuttgart Germany

The new software FEniCS-preCICE is a middle software layer, sitting in between the existing finite-element library FEniCS and the coupling library preCICE. The middle layer simplifies coupling (existing) FEniCS application codes to other simulation software via preCICE. To this end, FEniCS-preCICE converts between FEniCS and preCICE mesh and data structures, provides easy-to-use coupling conditions, and manages data checkpointing for implicit coupling. The new software is a library itself and follows a FEniCS-native style. Only a few lines of additional code are necessary to prepare a FEniCS application code for coupling. We illustrate the functionality of FEniCS-preCICE by two examples: a FEniCS heat conduction code coupled to OpenFOAM and a FEniCS linear elasticity code coupled to SU2. The results of both scenarios are compared with other simulation software showing good agreement. © 2021, CC BY-NC-ND.

关键词： Finite element method

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Performance comparison and analysis of ad hoc routing algorithms

Performance comparison and analysis of ad hoc routing algori...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： A. Boukerche Parallel Simulation and Distributed Systems Research Laboratory Department of Computer Science University of North Texas USA

ISBN: (纸本)0780370015

A mobile ad-hoc network (Manet) is a system of wireless mobile nodes dynamically self-organizing in arbitrary and temporary network topologies. People and vehicles can thus be internetworked in areas without a pre-existing communication infrastructure, or when the use of such infrastructure requires wireless extension. Therefore, such networks are designed to operate in widely varying environments, from military networks to low-power sensor networks and other embedded systems. Frequent topology changes caused by node mobility make routing in ad hoc wireless networks a challenging problem. We focus upon routing protocols for ad hoc networks. We study and compare the performance of several routing protocols. A variety of workload and scenarios using a variety of mobility, load and size of the ad hoc network were simulated.

关键词： Performance analysis Algorithm design and analysis Ad hoc networks Network topology Routing protocols Vehicles Internet Mobile communication Wireless sensor networks Sensor systems

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Density estimation with adaptive sparse grids for large data sets 14

Density estimation with adaptive sparse grids for large data...

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14th SIAM International Conference on Data Mining, SDM 2014

作者： Peherstorfer, Benjamin Pflüger, Dirk Bungartz, Hans-Joachim Aerospace Computational Design Laboratory AeroAstro Massachusetts Institute of Technology United States Simulation of Large Systems Group Institute for Parallel and Distributed Systems University of Stuttgart Germany Scientific Computing Group Department of Computer Science Technische Universität München Germany

ISBN: (纸本)9781510811515

Nonparametric density estimation is a fundamental problem of statistics and data mining. Even though kernel density estimation is the most widely used method, its performance highly depends on the choice of the kernel bandwidth, and it can become computationally expensive for large data sets. WTe present an adaptive sparse-grid-based density estimation method which discretizes the estimated density function on basis functions centered at grid points rather than on kernels centered at the data points. Thus, the costs of evaluating the estimated density function are independent from the number of data points. We give details on how to estimate density functions on sparse grids and develop a cross validation technique for the parameter selection. We show numerical results to confirm that our sparse-grid-based method is well-suited for large data sets, and, finally, employ our method for the classification of astronomical objects to demonstrate that it is competitive to current kernel-based density estimation approaches with respect to classification accuracy and runtime. Copyright © SIAM.

关键词： Data mining

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Dynamic grid-based multicast group assignment in data distribution management

Dynamic grid-based multicast group assignment in data distri...

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International Workshop/Symposium on distributed simulation and Real-Time Applications (DS-RT)

作者： A. Boukerche A. Roy N. Thomas Parallel Simulation and Distributed Systems (PARADISE) Research Lab Computer Science Department University of North Texas USA

Data distribution management (DDM) is one of the services defined by the DoD High Level Architecture. DDM is necessary to provide efficient, scalable mechanisms for distributing state updates and interaction information in large scale distributed simulations. We describe data distribution management mechanisms (also known as filtering) used for real time training simulations. We propose a new DDM approach to multicast group allocation, which we refer to as a dynamic grid-based allocation. Our scheme is based on a combination of a fixed grid-based method, known for its low overhead and ease of implementation, and a sender-based strategy, which uses fewer multicast groups than the fixed grid-based method. We describe our DDM algorithm, its implementation, and report on the performance results that we have obtained using the RTI-Kit framework. These results include the outcome of experiments comparing our approach to the fixed grid-based method, and they show that our scheme is scalable and significantly reduces the message overhead of previous grid-based allocation schemes.

关键词： distributed decision making Computational modeling Management training Discrete event simulation Computer simulation Computer science Computer architecture Large-scale systems Filtering Multicast algorithms

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A distributed synchronization scheme for multimedia streams in mobile systems: proof and correctness

A distributed synchronization scheme for multimedia streams ...

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Conference on Local Computer Networks (LCN)

作者： A. Boukerche Sungbum Hong T. Jacob Parallel Simulation and Distributed Systems (PARADISE) Research Laboratory Department of Computer Science University of North Texas USA

ISBN: (纸本)0769513212

The rapid development in portable computing platforms, distributed multimedia systems and wireless communication technologies has led to a significant interest in mobile multimedia and wireless networking. Video entertainment and multimedia Internet access over wireless networks are examples of future wireless personal communication systems. These, however, incur challenging technological issues. The synchronization of the multimedia objects among mobile clients is one of the most important of these issues. The task of synchronization in wireless multimedia systems is to eliminate variations and delays incurred during the transmission of multiple-media streams and to maintain the temporal order among the various media streams. We propose an efficient distributed multimedia synchronization algorithm for wireless and mobile multimedia systems to ensure and facilitate mobile clients' access to multimedia objects. We discuss the algorithm and provide its formal proof and correctness.

关键词： Streaming media Multimedia systems Wireless communication Computer networks distributed computing Portable computers Communications technology Mobile computing Multimedia computing IP networks

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A risk-free multiversion temporally correct algorithm

A risk-free multiversion temporally correct algorithm

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International Symposium on parallel and distributed Processing (IPDPS)

作者： A. Boukerche T. Tuck Department of Computer Sciences Parallel Simulation and Distributed Systems (PARADISE) Research Laboratory University of North Texas USA

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A synchronization scheme for distributed multimedia servers and mobile clients using quasi-sink

A synchronization scheme for distributed multimedia servers ...

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International Symposium on parallel and distributed Processing (IPDPS)

作者： A. Boukerche Sungbum Hong T. Jacob Parallel Simulation and Distributed Systems PARADISE Research Lab Department of Computer Sciences University of North Texas USA

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A simulation based study of on-demand routing protocols for ad hoc wireless networks

A simulation based study of on-demand routing protocols for ...

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Annual Symposium on simulation

作者： A. Boukerche Parallel Simulation and Distributed Systems PARADISE Research Laboratory Department of Computer Science University of North Texas USA

ISBN: (纸本)0769510922

Ad hoc networks are wireless, mobile networks that can be set up anywhere and anytime without the aid of any established infrastructure or centralized administration. Because of the limited range of each host's wireless transmission, to communicate with hosts outside its transmission range, a host needs to enlist the aid of its nearby hosts in forwarding packets to the destination. However, since there is no stationary infrastructure such as base stations, each host has to act as a router for itself. A routing protocol for ad hoc networks is executed on every host and is therefore subject to the limit of the resources at each mobile host. A good routing protocol should minimize the computing load on the host as well as the traffic overhead on the network. Therefore, a number of routing protocols have been proposed for ad hoc wireless networks. We focus upon on-demand schemes. We study and compare the performance of the following three routing protocols AODV, CBRP and DSR. A variety of workload and scenarios, as characterized by mobility, load and size of the ad hoc network were simulated. Our results indicate that despite its improvement in reducing route request packets, CBRP has a higher overhead than DSR because of its periodic hello messages while AODV's end-to-end packet delay is the shortest when compared to DSR and CBRP.

关键词： Routing protocols Wireless networks Ad hoc networks Computational modeling Computer simulation Wireless communication Base stations Computer networks Laboratories Computer science

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