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arXiv 2025年

作者： Lueber, Anna Karchev, Konstantin Fisher, Chloe Heim, Matthias Trotta, roberto Heng, Kevin Faculty of Physics Ludwig Maximilian University Scheinerstrasse 1 Munich BavariaD-81679 Germany Center for Space and Habitability University of Bern Gesellschaftsstrasse 6 BernCH-3012 Switzerland via Bonomea 265 Trieste34136 Italy Department of Physics University of Oxford Keble Road OxfordOX1 3RH United Kingdom Astrophysics Group Physics Department Blackett Lab Imperial College London Prince Consort Road LondonSW7 2AZ United Kingdom INFN – National Institute for Nuclear Physics Via Valerio 2 Trieste34127 Italy Italian Research Center on High-Performance Computing Big Data and Quantum Computing Italy ARTORG Center for Biomedical Engineering Research University of Bern Murtenstrasse 50 BernCH-3008 Switzerland University College London Department of Physics & Astronomy Gower St LondonWC1E 6BT United Kingdom Astronomy & Astrophysics Group Department of Physics University of Warwick CoventryCV4 7AL United Kingdom

In the era of the James Webb Space Telescope (JWST), the dramatic improvement in the spectra of exoplanetary atmospheres demands a corresponding leap forward in our ability to analyze them: atmospheric retrievals need to be performed on thousands of spectra, applying to each large ensembles of models (that explore atmospheric chemistry, thermal profiles and cloud models) to identify the best one(s). In this limit, traditional Bayesian inference methods such as nested sampling become prohibitively expensive. We introduce FASTEr (Fast Amortized Simulation-based Transiting Exoplanet retrieval), a neural-network based method for performing atmospheric retrieval and Bayesian model comparison at a fraction of the computational cost of classical techniques. We demonstrate that the marginal posterior distributions of all parameters within a model as well as the posterior probabilities of the models we consider match those computed using nested sampling both on mock spectra, and for the real NIrSpec PrISM spectrum of WASP-39b. The true power of the FASTEr framework comes from its amortized nature, which allows the trained networks to perform practically instantaneous Bayesian inference and model comparison over ensembles of spectra – real or simulated – at minimal additional computational cost. This offers valuable insight into the expected results of model comparison (e.g., distinguishing cloudy from cloud-free and isothermal from non-isothermal models), as well as their dependence on the underlying parameters, which is computationally unfeasible with nested sampling. This approach will constitute as large a leap in spectral analysis as the original retrieval methods based on Markov Chain Monte Carlo have proven to be. © 2025, CC BY.

关键词： Markov chains

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performance optimization for large scale computing: The scalable VAMPIr approach

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International Conference on Computational Science, ICCS 2001

作者： Brunst, Holger Winkler, Manuela Nagel, Wolfgang E. Hoppe, Hans-Christian Center for High Performance Computing Dresden University of Technology DresdenD-01062 Germany PALLAS GmbH Hermühlheimer Str. 10 BrühlD-50321 Germany

ISBN: (纸本)3540422331

performance optimization remains one of the key issues in parallel computing. Many parallel applications do not benefit from the continually increasing peak performance of todays massively parallel computers, mainly because they have not been designed to operate efficiently on the 1000s of processors of todays top of the range systems. Conventional performance analysis is typically restricted to accumulated data on such large systems, severely limiting its use when dealing with real-world performance bottlenecks. Event based performance analysis can give the detailed insight required, but has to deal with extreme amounts of data, severely limiting its scalability. In this paper, we present an approach for scalable event-driven performance analysis that com-bines proven tool technology with novel concepts for hierarchical data layout and visualization. This evolutionary approach is being validated by implementing extensions to the performance analysis tool Vampir. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Scalability

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Steady states of a field-emission-limited diode: Space-charge effects 16

Steady states of a field-emission-limited diode: Space-charg...

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16th International Vacuum Microelectronics Conference, IVMC 2003

作者： Lin, Ming-Chieh Chung, Hao-Ming Chuu, der-San NanoScience Research Team Department of R and D National Center for High-Performance Computing Science-Based Industrial Park 7 R and D RD. VI Hsinchu Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan

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Maximum local scour depth at bridge piers under unsteady flow

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Journal of Hydraulic Engineering 2009年第7期135卷 609-614页

作者： Lai, Jihn-Sung Chang, Wen-Yi Yen, Chin-Lien 158 Chow Shan Road Taipei 106 Taiwan National Center for High-Performance Computing No. 7 R and D 6th Rd. Hsinchu Taiwan Department of Civil Engineering Hydrotech Research Institute NTU 158 Chow Shan Road Taipei 106 Taiwan

The temporal effect of hydrograph on local scour depth is investigated under clear-water scour condition. By analyzing the characteristics of scour-depth evolutions at bridge piers for different rising hydrographs, a relation for estimating the maximum scour depth in uniform sediment is proposed. In the relation, the flow unsteadiness effect is taken into account by an unsteady flow parameter combining the peak-flow intensity and time-to-peak factors. For nonuniform sediment with d84 employed as the effective sediment size, this relation can yield reasonably good results of the maximum scour depth under rising hydrograph. © 2009 ASCE.

关键词： Scour

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Software development in the grid: The dAMIEN tool-set

Software development in the grid: The DAMIEN tool-set

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International Conference on Computational Science, ICCS 2003

作者： Gabriel, Edgar Keller, rainer Lindner, Peggy Müller, Matthias S. resch, Michael M. High Performance Computing Center Stuttgart Allmandring 30 StuttgartD-70550 Germany Innovative Computing Laboratories Computer Science Department University of Tennessee KnoxvilleTN United States

ISBN: (纸本)9783540448600

The development of applications for Grid-environments is currently lacking the support of tools, which end-users are familiar with from their regular working environment. This paper analyzes the requirements for developing, porting and optimizing scientific applications for Grid-environments. A toolbox designed and implemented in the frame of the dAMIEN project which closes some of the gaps and supports the end-user during the development of the application and its day-to-day usage in Grid-environments is then presented. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Software design

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Quasistationary States of an Electron in Open Quantum dots 5

Quasistationary States of an Electron in Open Quantum Dots

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5th Pacific rim Conference on Lasers and Electro-Optics, CLEO/Pacific rim 2003

作者： Lin, Ming-Chieh Chuu, der-San NanoScience Research Team Department of R&D National Center for High-Performance Computing 7 R&D Rd. VI Science-Based Industrial Park Hsinchu300 Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)0780377664

The quasistationary states of an electron in a spherically N-layered open quantum dot are investigated. A novel complex eigen-solver is presented to determine both the resonance positions Er and the corresponding lifetimes τ of the system. In this eigen-solver, the wave functions are expressed in terms of the Whittaker functions with complex arguments, and the effective-mass Schrödinger equation is solved analytically. The quasistationary states in terms of the complex eigen-energies, Ek-ih/(2π), are extracted numerically in the complex plane by Newton's method. All the quasistationary states of the system can be determined via this eigen-solver. For illustration, the numerical calculations are carried out for the HgS/CdS/HgS multi-layered quantum dot. Both the energy levels and the lifetimes of the quasistationary states are found as functions of the geometric parameters of the system. The lifetime of an electron in such a system is very sensitive to the geometric characteristics. © 2003 IEEE.

关键词： Mercury compounds

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discovering latent themes in aviation safety reports using text mining and network analytics

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International Journal of Transportation Science and Technology 2024年第4期16卷 292-316页

作者： Yingying Xing Yutong Wu Shiwen Zhang Ling Wang Haoyuan Cui Bo Jia Hongwei Wang The Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai201804China Institute of Safety Operation Research Institute China Eastern Technology Application R&D CenterShanghai 201707China Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)Singapore 138632Singapore

Aviation accidents,referring to unexpected and undesirable events involving aircraft,often cause great damage to property and human *** from historical accidents is pivotal for improving safety in ***,aviation accidents are typically documented and stored as unstructured or semi-structured free-text,rendering the ability to analyze such data a difficult *** study presents a novel framework that combines text mining and network analytics techniques to provide the ability to analyze aviation accident reports *** framework comprises a four-step modelling approach to:(1)the transformation of unstructured aviation safety report texts into structured numeric matrices using the TF-IdF matrix;(2)the identification of aviation accident topics using a structural topic model(STM);(3)the production of a word co-occurrence network(WCN)to determine the interrelations between aviation safety risk factors;and(4)quantitative analysis by technology of keywords to pinpoint key causal factors in aviation safety *** proposed framework is validated by analyzing aviation accident reports collected by the National Transportation Safety Board(NTSB).The results indicate that STM provides a more granular partitioning of topics and better distinguishes between similar events compared to traditional latent dirichlet allocation(LdA).Among the identified topics,“Fuel and Power”and“En-route Phase”have the highest occurrence rate according to ***,“Aircraft Crash”is the most prevalent topic in aviation accidents that resulted in fatal injuries,whereas the“Landing phase”is the most prevalent topic in nonfatal injuries on *** on the WCN,three centrality measures highlight“inspection of equipment”and“take off”as the most important risk factors in aviation *** proposed framework provides a comprehensive solution for in-depth analysis of aviation safety reports,offering decision support for aviation safety management and ac

关键词： Aviation safety Aviation accident report Text mining Topic modeling Network analysis

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On a Model for Laser Cutting involving Surface Tension

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IFAC-PapersOnLine 2018年第2期51卷 180-185页

作者： Vossen, G. Friedlich, N.A. Hermanns, T. Nießen, M. Schulz, W. Hochschule Niederrhein Institut für Modellierung und High-Performance Computing Reinarzstr. 49 KrefeldD-47805 Germany Hochschule Niederrhein Fachbereich Maschinenbau und Verfahrenstechnik Reinarzstr. 49 KrefeldD-47805 Germany Fraunhofer Institut für Lasertechnik ILT Modellierung und Simulation Steinbachstr. 15 AachenD-52074 Germany

A model for laser cutting describing the movements of the two free boundaries of the melt will be presented. The model is an asymptotic approximation of a free boundary problem and involves the surface tension of the melt. The stationary solution will be given and investigated for linear stability. The results are illustrated with data from laser cutting experiments. © 2018

关键词： Laser beams Boundary value problems Laser beam cutting Models Surface tension Asymptotic approximation Free boundary Free boundary problems Laser cutting Linear Stability Stability analysis Stationary solutions

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An OpenMP extension library for memory affinity

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8766卷 103-114页

作者： Schmidl, dirk Cramer, Tim Terboven, Christian Mey, dieteran Müller, Matthias S. IT Center RWTH Aachen University D - 52074 Aachen Chair for High Performance Computing RWTH Aachen University D - 52074 Aachen JARA - High-Performance Computing Schinkelstraße 2 AachenD - 52062 Germany

OpenMP 4.0 extended affinity support to allow pinning of threads to places. Places are an abstraction of machine locations which in many cases do not require extensive hardware knowledge by the user. For memory affinity, i.e. data initialization and migration on NUMA systems, support is still missing in OpenMP. In this work we present an extension library for OpenMP which implements round-robin memory initialization over places and memory migration, either explicitly or implicitly. The latter is presented with an implementation based on a next-touch algorithm for Linux. We study the overhead of our methods with a simple model that allows to predict if migration is beneficial or not for a certain use case and we demonstrate the correctness of the migration methods and the correctness of our model prediction with the STrEAM benchmark and an implementation of a CG method. Finally, we discuss how memory affinity could be integrated in future OpenMP versions. © Springer International Publishing Switzerland 2014.

关键词： routers

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The design and implementation of patent collaboration managing platform based on cloud architecture

The design and implementation of patent collaboration managi...

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IEEE International Conference on Software Engineering and Service Sciences (ICSESS)

作者： Xiang Wang Yong Yang Xiaoguang Lin Yongyuan Chen Ju Zhang High Performance Computing Application R&D Center Chinese Academy of Sciences Chongqing China

ISBN: (纸本)9781479932801

The patent information data has the characteristics of massive, open, scattered, but the lack of a well-designed platform which can make good use of these data is still a problem. The platform introduced in this paper which is mainly tailored for patent agencies can organize resource information, provide analysis report, and promote business cooperation. Based on cloud architecture, the platform has been designed and implemented to integrate the patent data from different systems, allocate resources dynamically through virtualization technology, and provide high-value services by depth data analysis. At present, this platform is applied as a business cooperation platform in the project of patent-cloud in Chongqing.

关键词： Patents Collaboration Cloud computing Virtualization Servers Business databases

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