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GENASIS Mathematics: object-oriented manifolds, operations, and solvers for large-scale physics simulations

COMPUTER PHYSICS COMMUNICATIONS 2018年 222卷 384-412页

作者： Cardall, Christian Y. Budiardja, Reuben D. Oak Ridge Natl Lab Phys Div Oak Ridge TN 37831 USA Univ Tennessee Dept Phys & Astron Knoxville TN 37996 USA Oak Ridge Natl Lab Natl Ctr Computat Sci Oak Ridge TN 37831 USA

The large-scale computer simulation of a system of physical fields governed by partial differential equations requires some means of approximating the mathematical limit of continuity. For example, conservation laws are often treated with a 'finite-volume' approach in which space is partitioned into a large number of small 'cells,' with fluxes through cell faces providing an intuitive discretization modeled on the mathematical definition of the divergence operator. Here we describe and make available Fortran 2003 classes furnishing extensible object-oriented implementations of simple meshes and the evolution of generic conserved currents thereon, along with individual 'unit test' programs and larger example problems demonstrating their use. These classes inaugurate the Mathematics division of our developing astrophysics simulation code GENASIS (General A strophysical Simulation System), which will be expanded over time to include additional meshing options, mathematical operations, solver types, and solver variations appropriate for many multiphysics applications. Program Summary Program Title: SineWave, SawtoothWave, RiemannProblem, RayleighTaylor, SedovTaylor, and FishboneMoncrief (fluid dynamics example problems illustrating GENASIS Mathematics) Program Files doi: http://***/10.17632/mzvxngwtw6.1 Licensing provisions: GPLv3 programming language: Fortran 2003 (tested with gfortran 6.2.0, Intel Fortran 16.0.3, Cray Compiler 8.5.3) External routines/libraries: MPI [1] and Silo [2] Nature of problem: By way of illustrating GENASIS Mathematics functionality, solve example 'fluid dynamics problems. Solution method: Finite-volume discretization;second-order slope-limited reconstruction;HLL Riemann Solver;Runge-Kutta time integration. Additional comments including Restrictions and Unusual features: The example problems named above are not ends in themselves, but serve to illustrate the functionality available though GENASIS Mathematics. In addition to these more su

关键词： Simulation framework object-oriented programming Fortran 2003 Partial differential equations Meshing Conservation laws

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object-oriented numerical integration - a template scheme for FEM and BEM applications

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ADVANCES IN ENGINEERING SOFTWARE 2006年第3期37卷 172-183页

作者： Marczak, RJ Univ Fed Rio Grande do Sul Dept Mech Engn BR-90050170 Porto Alegre RS Brazil

An object-oriented numerical integration template implementation is presented on the basis of the C + + programming language. Aiming its straightforward application in finite and boundary element methods, the design supports integrand objects of scalar, vector or matrix types, so that a single programming statement is able to integrate element matrices and vectors. The integrand can contain singularities like the ones typically found in boundary element methods, allowing the evaluation of both regular and singular integrals under the same programming structure. The use of the proposed design is illustrated through sonic elementary applications as well as finite element and boundary element code excerpts. (C) 2005 Elsevier Ltd. All rights reserved.

关键词： numerical integration object-oriented programming templates singular integrals boundary element method finite element method

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High-speed multi-input VME bus data acquisition system

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MEASUREMENT SCIENCE AND TECHNOLOGY 2000年第8期11卷 1224-1232页

作者： Loureiro, CFM Correia, CMBA Varandas, CAF Univ Coimbra Dept Fis EURATOM Assoc IST P-3004516 Coimbra Portugal Inst Super Tecn EURATOM Assoc Ctr Cusao Nucl P-1096 Lisbon Portugal

A data acquisition module, developed under a modular organizational architecture with links to an object-oriented design approach, is described. The module comprises four independent 250 MHz eight-bit data acquisition channels and a DSP, each channel controlling a large memory pool for converted data and supporting several trigger and operating mechanisms. The hardware, although complex, is completely controlled through a set of hierarchically organized classes, making use of the object-oriented programming paradigm to keep complexity (from the user's and programmer's points of view) to a minimum. The integration of the module in the data acquisition system of the reflectometry diagnostic in tokamak ASDEX-Upgrade is described, showing the hardware in regular use and the validity of the object-oriented interface developed for programming.

关键词： data acquisition object-oriented programming reflectometry diagnostic

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IGSTK:: An open source software toolkit for image-guided surgery

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COMPUTER 2006年第4期39卷 46-+页

作者： Gary, K Ibáñez, L Aylward, S Gobbi, D Blake, MB Cleary, K Arizona State Univ Coll Sci & Technol Div Comp Studies Tempe AZ 85287 USA Kitware Inc Clifton Pk NY USA Georgetown Univ Dept Comp Sci Washington DC 20057 USA Georgetown Univ Med Ctr Dept Radiol Imaging Sci Washington DC 20007 USA Georgetown Univ Med Ctr Informat Syst Ctr Washington DC 20007 USA

Surgeons increasingly rely on dynamic, three-dimensional medical images for instrument guidance and clinical decision-making during minimally invasive procedures. The typical display combines images acquired before the intervention with graphical representations of the instruments and also can include intraoperative image updates of the anatomy. Tracking systems indicate the location of surgical instruments relative to the patient's body, which helps guide the physician to the specific anatomical target. The authors' Image-Guided Software Toolkit contains the basic software components for developing an image-guided surgery system, including a component for controlling the tracker as well as a display component for overlaying images of patient anatomy and surgical instruments.

关键词： medical image processing object-oriented programming public domainsoftware software reliability software reusability surgery IGSTK Image-Guided Software Toolkit agile software engineering principles component-based software engineering principles image-

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A decision-making model for flexible manufacturing system

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ASSEMBLY AUTOMATION 2009年第1期29卷 32-40页

作者： Mehijerdi, Yahia Zare Yazd Univ Dept Ind Engn Yazd Iran

Purpose - The purpose of this paper is to develop a computer aided decision-making model for flexible manufacturing system (FMS) situations when multiple conflicting objectives are addressed by the management. Design/methodology/approach - It is assumed that the problem is the managerial level schedule rather than the operational schedule. As a tool, goal programming has been employed for measuring the trade-offs among the objectives. As a safeguard, the level of the reliability of the constraints associated with the random coefficients is taken into consideration. As an optimization technique, the approach of chance constrained programming which has been an operational way for introducing probabilistic constraints into the collection of the linear programming and goal programming problem constraints is stated and mathematically formulated. Findings - The approach of chance constrained programming is suitable to introduce management concerns about the reliability of the constraints of the problem in the FMS. Originality/value - The paper gives an overview of the FMS and proposes a goal programming model for the analysis of problem. The proposed model acknowledges the randomness of customer demands for better standardization of production planning and inventory management systems. By the fact that customer demands are not always deterministic the hypothesis that sale level for each period is normally distributed is imposed. A sample example problem is provided to show how the proposed model can work.

关键词： Flexible Manufacturing systems object-oriented programming Logic programming Decision making Production scheduling Inventory control

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AN object-oriented VLSI CAD FRAMEWORK - A CASE-STUDY IN RAPID PROTOTYPING

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COMPUTER 1989年第5期22卷 28-37页

作者： GUPTA, R CHENG, WH GUPTA, R HARDONAG, I BREUER, MA Univ. of Southern California Los Angeles CA

It is shown, in the context of an actual prototype VLSI CAD framework called Cbase, how concepts such as data abstraction, property and operation inheritance, object specialization/generalization, code reusability, and polymorphism offered by object-oriented database management systems (OODBMSs) support rapid prototyping. The work was conducted on Vbase, a commercially available OODBMS, but the results and conclusions apply to any database with comparable capabilities. To implement the prototype user interface, the X11 toolkit, a windowing package that is also built around the object paradigm, was used

关键词： Cbase OODBMS VLSI Vbase X11 toolkit circuit CAD code reusability data abstraction data structures database management systems object paradigm object specialization/generalization object-oriented VLSI CAD framework object-oriented database management systems object-oriented programming operation inheritance polymorphism property inheritance prototype VLSI CAD prototype user interface rapid prototyping software engineering user interfaces windowing package

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Iterative criteria-based approach to engineering the requirements of software development methodologies

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IET SOFTWARE 2010年第2期4卷 91-104页

作者： Ramsin, R. Paige, R. F. Univ York Dept Comp Sci York YO10 5DD N Yorkshire England

Software engineering endeavours are typically based on and governed by the requirements of the target software;requirements identification is therefore an integral part of software development methodologies. Similarly, engineering a software development methodology (SDM) involves the identification of the requirements of the target methodology. Methodology engineering approaches pay special attention to this issue;however, they make little use of existing methodologies as sources of insight into methodology requirements. The authors propose an iterative method for eliciting and specifying the requirements of a SDM using existing methodologies as supplementary resources. The method is performed as the analysis phase of a methodology engineering process aimed at the ultimate design and implementation of a target methodology. An initial set of requirements is first identified through analysing the characteristics of the development situation at hand and/or via delineating the general features desirable in the target methodology. These initial requirements are used as evaluation criteria;refined through iterative application to a select set of relevant methodologies. The finalised criteria highlight the qualities that the target methodology is expected to possess, and are therefore used as a basis for de. ning the final set of requirements. In an example, the authors demonstrate how the proposed elicitation process can be used for identifying the requirements of a general object-oriented SDM. Owing to its basis in knowledge gained from existing methodologies and practices, the proposed method can help methodology engineers produce a set of requirements that is not only more complete in span, but also more concrete and rigorous.

关键词： formal specification requirements identification iterative methods SDM object-oriented programming Software engineering techniques object-oriented programming software engineering target methodology iterative method Formal methods software development methodology

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The design of PACS (Physics-oriented Accelerator Control System) and its implementation in a heavy ion accelerator facility

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2020年第0期953卷 163170-000页

作者： Ma, G. M. Liu, J. Yang, J. C. Chai, W. P. Ruan, S. Zhu, Y. P. Wang, G. Shen, G. D. Wang, R. R. Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Huizhou Res Ctr Ion Sci Huizhou 516003 Peoples R China

As many diverse accelerator facilities are designed, constructed and operated by IMP (Institute of Modern Physics, Chinese Academy of Sciences), the existing physics control system cannot cover all requirements of these facilities. In order to save the construction time, improve the commissioning efficiency, simplify the operation and reach higher beam intensity and better beam quality, a new physics control system, PACS (Physics-oriented Accelerator Control System), is proposed, designed and implemented in the IMP. With the control layer in three layers, i.e. application layer, physics layer and control layer, the PACS is protocol neutral and can be deployed to all accelerator facilities in the IMP without massive reprogramming. The physics layer encapsulates all physics control processes, including device-level physics and system-level physics, into highly usable interfaces, which makes the development of the application layer and the customized applications simpler, more robust and efficient. Due to the OOP (object-oriented programming) technology used in this layer and specific designs, the PACS is highly scalable and can keep pace with the rapidly changing hardware and software. As the application layer is built upon the physics layer interfaces, no matter what is updated in the physics layer, the applications remain unchanged. Many new physics control processes can be tested and implemented in the physics layer by the developers or the users without influencing the operation of these facilities. Now, a version of PACS for miniature facilities is implemented and tested in the CSR, a heavy ion accelerator facility for scientific research in the IMP. It meets the expected goals and provides a solid base for following versions. In the future, the PACS will become a general-purpose physics control system for all heavy ion accelerator facilities.

关键词： Physics control system PACS Heavy ion accelerator object-oriented programming

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Implementing a mobile virtual electromagnetics laboratory

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IET SCIENCE MEASUREMENT & TECHNOLOGY 2012年第5期6卷 398-402页

作者： Browne, D. R. Flint, J. A. Pomeroy, S. C. Univ Loughborough Sch Elect Elect & Syst Engn Loughborough LE11 3TU Leics England

Modern mobile devices are sufficiently powerful to execute computationally intensive mathematical problems. This study presents an implementation of a two-dimensional transmission line matrix method (TLM) solver executing on a Smartphone. Software development and architectural design are discussed, focusing on object-oriented strategies for modular and reusable code. Optimisation strategies are also discussed, with large variations in performance observed dependent on the data-caching method that is used. Swapping between data buffers using pointers was shown to be the most effective method, offering significant performance gains over the original software. It was shown for a mesh measuring 246 by 370 nodes running on an iPhone 4 that an update rate of 9.37 fps could be achieved.

关键词： pointer cache storage Optimisation techniques iPhone object-oriented strategy mobile computing architectural design mobile virtual electromagnetic laboratory Mobile radio systems optimisation computational electromagnetics Software engineering techniques smart phones Ubiquitous and pervasive computing Algebra data caching method Semiconductor storage Electrical engineering computing 2D transmission line matrix method data buffer software architecture smart phone software reusability transmission line matrix methods software development swapping reusable code mobile device modular code object-oriented programming object-oriented programming

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Integrated fault detection and isolation: Application to a winery's wastewater treatment plant

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APPLIED INTELLIGENCE 2000年第1期13卷 59-76页

作者： Genovesi, A Harmand, J Steyer, JP INRA Lab Biotechnol Environm F-11100 Narbonne France

In this paper, an integrated object-oriented fuzzy logic fault detection and isolation (FDI) module for a biological wastewater treatment process is presented. The defined FDI strategy and the software implementation are detailed. Using experimental results obtained with a one cubic meter fixed bed reactor for the anaerobic digestion of industrial wine distillery vinasses, examples of material and biological failures are presented together with the corresponding fault signals generated by the FDI module.

关键词： fuzzy logic on-line fault detection and isolation (FDI) object-oriented programming anaerobic digestion wastewater treatment

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