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object-oriented stochastic finite element analysis of fibre metal laminates

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2005年第12-16期194卷 1427-1446页

作者： Chung, DB Gutiérrez, MA de Borst, R Delft Univ Technol Koiter Inst Delf Fac Aerosp Engn NL-2600 GB Delft Netherlands

This paper deals with issues arising from the stochastic simulation of fibre metal laminates. The elasticity modulus of the composite layer is assumed to be a random process. An object-oriented computational framework is proposed, which can be integrated with an existing object-oriented deterministic infrastructure. This framework is utilized to implement a spectral stochastic version of the solid-like shell element. Modelling aspects particular to the layered nature of the fibre metal laminates are discussed and implemented in the proposed framework. Practical application of the software is illustrated by computations on panels of GLARE (fibre metal laminate). (C) 2004 Elsevier B.V. All rights reserved.

关键词： stochastic finite elements solid-like shell element object-oriented programming fibre metal laminates GLARE

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CPE: A parallel library for financial engineering applications

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COMPUTER 2005年第10期38卷 70-+页

作者： Leong, MP Cbeung, CC Cheung, CW Wan, PPM Leung, IKH Yeung, WMM Yuen, WS Chow, KSK Leung, KS Leong, PHW Chinese Univ Hong Kong Hong Kong Hong Kong Peoples R China

To effectively utilize parallel computing, developers need software that reduces the complexity of the process as well as tools to support integration of parallel and desktop machines. The Clustertech parallel environment (CPE) is a C++ library that facilitates development of large-scale parallel applications. This environment offers unprecedented efficiency in developing financial engineering applications and porting them to a wide range of parallel-cluster and symmetric-multiprocessing machines. CPE's object-oriented approach facilitates information hiding as well as code reuse.

关键词： C++ language CPE architecture Clustertech parallel environment Clustertech parallel environment Financial engineering Finite-difference calculation Monte Carlo simulation Parallel computing financial data processing financial engineering application message passing message passing interface multiprocessing machines object-oriented C++ library object-oriented programming parallel cluster parallel library parallel programming parallel programming software libraries

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On the implementation of object-oriented philosophy for the design of a finite element code dedicated to multibody systems

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FINITE ELEMENTS IN ANALYSIS AND DESIGN 2005年第5期41卷 493-520页

作者： Kromer, V Dufossé, F Gueury, M Univ Henri Poincare Nancy ERIN ESSTIN F-54519 Vandoeuvre Les Nancy France Univ Valenciennes SA VALUTEC F-59314 Valenciennes 9 France

The principal objective of this paper is to describe one approach to the design and implementation of a multibody systems analysis code using an object-oriented architecture. Emphasis will be placed on the adequacy between object-oriented programming and the finite element method used for the treatment of three-dimensional multibody flexible mechanisms with large rotations and large strains, within a given formalism and given hypotheses. We will show that the object-oriented programming greatly simplifies the choice and the implementation of other formalisms concerning polyarticulated systems, thus conferring high flexibility and adaptability to the developed software. (C) 2004 Elsevier B.V. All rights reserved.

关键词： object-oriented programming multibody systems finite element analysis

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Parallelization of an object-oriented FEM dynamics code:: influence of the strategies on the Speedup

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ADVANCES IN ENGINEERING SOFTWARE 2005年第6期36卷 361-373页

作者： Pantalé, O Ecole Natl Ingn CMAO LGP F-65016 Tarbes France

This paper presents an implementation in C + + of an explicit parallel finite element code dedicated to the simulation of impacts. We first present a brief overview of the kinematics and the explicit integration scheme with details concerning some particular points. Then we present the OpenMP parallelization toolkit used in order to parallelize our FEM code, and we focus on how the parallelization of the DynELA FEM code has been conducted for a shared memory system using OpenMP. Some examples are then presented to demonstrate the efficiency and accuracy of the proposed implementations concerning the Speedup of the code. Finally, an impact simulation application is presented and results are compared with the ones obtained by the commercial Abaqus explicit FEM code. (c) 2005 Elsevier Ltd. All rights reserved.

关键词： non-linear finite-element large deformations plasticity impact C plus object-oriented programming OpenMP parallel computing

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Demystifying the threat-modeling process

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IEEE SECURITY & PRIVACY 2005年第5期3卷 66-70页

作者： Torr, P Microsoft USA Abstract Authors References Cited By Keywords Metrics Similar Download Citation Email Print Request Permissions

In today's hostile online environment, software must be designed to withstand malicious attacks of all kinds. Unfortunately, even security-conscious products can fall prey when designers fail to understand the threats their software faces or the ways in which adversaries might try to attack it. To better understand a product's threat environment and defend against potential attacks, Microsoft uses threat modeling, which should be treated like any other part of the design and specification process. In fact, singling it out as a special activity performed outside the normal design process actually detracts from its importance to the overall development life cycle. We must consider security needs throughout the design process, just as we do with performance, usability, localizability, serviceability, or any other facet.

关键词： formal specification object-oriented programming security of data software maintenance software reusability Microsoft development life cycle hostile online environment software design threat environment threat modeling process product development securit object oriented programming Microsoft Data Security design process development time Software maintenance Formal specifications Product Design Software reuse

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LAMP lights enterprise development efforts

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COMPUTER 2005年第9期38卷 18-20页

作者： Lawton, G Lawton G.

A set of open source technologies is pushing its way into mainstream corporate software development: the LAMP stack, which includes the Linux operating system, Apache Web server, MySQL database, and scripting languages Perl, PHP, and Python. LAMP offers lower costs, greater flexibility, and faster improvements in the component technologies.

关键词： Apache Web server Internet LAMP stack LAMP technologies Linux operating system MySQL database PHP Perl Python component technologies corporate software development enterprise development efforts integrated software intranets object-oriented programming open source technologies open source technology public domain software scripting language software development

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An alternative to traditional software rehosting

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IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE 2005年第4期20卷 9-12页

作者： Ham, K SW Res Inst Warner Robins GA 31088 USA

This paper will describe one alternative to rehosting TPS software to newer computer platforms. It will describe the solution that Southwest Research Institute (SwRI) used to solve a problem with re-engineering legacy software into a modern object-oriented language. The advantages gained by this method are more advanced instruction to the operator (such as pictures and movies), flexible reporting scheme to diagnose system problems, and ease of software maintenance. This solution uses commercially available products including National Instruments (TM) TestStand (TM) and LabVIEW (TM) and Nflcrosoft (R) Visual Basic (R). The system is a four-tiered architecture to drive all test execution. The user interface is written in Visual Basic and allows the user to interact with the test execution when needed. This user interface in turn calls tests that are written in TestStand, and finally the individual tests call driver functions written in LabVIEW. A database serves as a repository for all test results, displays, and test limits. The use of this database allows for easy querying of measurement data to analyze trends in failures that help diagnose specific problems. By using this database, all test limits and test displays are contained in one central location that enables engineers to change these displays and limits on the fly without needing to change or even understand any test code. One other benefit of this data containment is that all Government classified data is separated out of the code and stored as one file, instead of in various locations as it was in the original source code.

关键词： database management systems object-oriented programming program testing software architecture software maintenance systems re-engineering user interfaces Government classified data LabVIEW Microsoft Visual Basic National Instruments TestStand TPS softwar systems re-engineering program testing Laboratory Virtual Instrumentation Engineering Workbenc Computer platforms User Interface Device Component object oriented programming Software architecture measurement data Software maintenance Microsoft Office database management systems

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Difunctorial Semantics of object Calculus

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ELECTRONIC NOTES IN THEORETICAL COMPUTER SCIENCE 2005年第2期138卷 79-94页

作者： Glimming, Johan Ghani, Neil Stockholm Univ Dept Numer Anal & Comp Sci Stockholm Sweden Univ Leicester Dept Math & Comp Sci Leicester Leics England

In this paper we give a denotational model for Abadi and Cardelli's first order object calculus FOb 1+x mu (without subtyping) in the category pCpo. The key novelty of our model is its extensive use of recursively defined types, supporting self-application, to model objects. At a technical level, this entails using some sophisticated techniques such as Freyd's algebraic compactness to guarantee the existence of the denotations of the object types. The last sections of the paper demonstrates that the canonical recursion operator inherent in our semantics is potentially useful in object-oriented programming. This is witnessed by giving a straightforward translation of algebraic datatypes into so called wrapper classes.

关键词： Category theory object-oriented programming

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Integrated software suite for magnetocardiographic data analysis - A proposal based on an interactive programming environment

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METHODS OF INFORMATION IN MEDICINE 2005年第1期44卷 114-123页

作者： Comani, S Mantini, D Merlino, B Reale, M Di Luzio, S Romani, GL Univ G DAnnunzio Dipartimento Sci Clin & Bioimmagini I-66103 Chieti Italy Univ G dAnnunzio Sect Phys Sci Dept Clin Sci & Bioimaging Chieti Italy Univ G DAnnunzio Inst Adv Biomed Technol I-66103 Chieti Italy Marche Polytech Univ Dept Informat & Automat Engn Ancona Italy Catholic Univ Inst Radiol Rome Italy Univ G dAnnunzio Dept Oncol & Neurosci Chieti Italy

objectives: This paper describes an integrated software suite (ISS) dor the processing of magnetocardiographic (MCG) recordings obtained with super-conducting multi-channel systems having different characteristics. We aimed to develop a highly flexible suite including toolboxes for current MCG applicants, organizations, organized consistently with an open architecture that allows function integrations and upgrades with minimal modifications, the suite was designed for the compliance not only of physicists and engineers but also of physicians, who have a different professional profile and are accustomed to retrieved information in different ways. Methods: The MCG-ISS was designed to work with all common graphical user interface operative systems. MALTAB was chosen as the interactive programming environment (IPE), and the software was developed to achieve usability, interactivity, reliability, modularity, expanibility, interoperability, adaptability and graphics style tailoring. Three user, already experienced in MCG data analysis, have intensively tested MCG-ISS for six months. A great amount of MCG data on normal subject and patients was used to assess software performances in-term of user compliance and confidence and total analysis time. Results: The proposed suite is an all-in-one analysis tool that succeeded in speeding MCG data analysis up to about 55% with respect to standard reference routines;it consequently enhanced analysis performance and user compliance. Conclusions: Those results, together with the MCG-ISS advantage of being independent on the acquisition system, suggest that software suites like the proposed one could uphold a wider diffusion of MCG as a diagnostic tool in the clinical setting.

关键词： integrated software suite (ISS) interactive programming environment (IPE) object-oriented programming magnetocardiographic data analysis user-machine interaction

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Merging genomic control networks and soil-plant-atmosphere-continuum models

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AGRICULTURAL SYSTEMS 2005年第3期86卷 243-274页

作者： Welch, SM Roe, JL Das, S Dong, Z He, R Kirkham, MB Kansas State Univ Dept Agron Manhattan KS 66506 USA Kansas State Univ Div Biol Manhattan KS 66506 USA Kansas State Univ Dept Elect & Comp Engn Manhattan KS 66506 USA Kansas State Univ Dept Comp & Informat Sci Manhattan KS 66506 USA

Advances in genomic science make it desirable to include genomic controls in soil-plant-atmosphere-continuum (SPAC) models by methods proposed in this paper. Molecular genetic concepts suggest that a differential equation similar to ones used in neural networks can be used to model single-gene elements of larger systems. Natural modifications to the equation incorporate temperature dependency. Multi-gene components based on this element function as Boolean logic gates, linear arithmetic units, delays, differentiators, integrators, oscillators, coincidence detectors, and bi-stable devices. Related genetic circuitry from real organisms is shown. Genomic integration with SPAC models entails whole-plant modeling with realistic morphology. Plants are networks of parts, iterated in time and space under genetic control, that induce and modulate conservative SPAC mass/energy flows. Network developmental rules can be stated as Lindenmayer grammars whose symbols represent plant parts programmed as software objects. A structure is presented for simulators based on these concepts. The discussion argues that prior object-oriented plant modeling approaches (i) do not reflect how plants actually develop morphologically and (ii) may represent processes in tactically unwise ways at a time when genomics is advancing knowledge of process interactions. Finally, genomics and expanding computing power redefine concepts of model "simplicity" and "complexity" to favor increased realism. (c) 2004 Elsevier Ltd. All rights reserved.

关键词： L-systems development simulation physiology environmental physics genetics object-oriented programming

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