检索结果-南通市图书馆

Fast MATLAB assembly of FEM matrices in 2D and 3D using cell-array approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2016年第2期7卷 167-186页

作者： Jonas Koko Clermont Universit´e Universit´e Blaise Pascal LIMOSBP 10448F-63000 Clermont-FerrandFrance CNRSUMR 6158LIMOSF-63173 AubiereFrance

We propose a MATLAB implementation of the P1 finite element method for the numerical solutions of the Poisson problem and the linear elasticity problem in two-dimensional(2D)and three-dimensional(3D).The code consists of vectorized(and short)assembling functions for the matrices(mass and stiffness)and the right-hand *** for the P1 finite element,the element mass matrix and right-hand side are simple,the implementation uses only the MATLAB function sparse on the elements *** the stiffness matrix,to obtain a MATLAB implementation close to the standard form,cell-arrays are used to store the gradients of the element basis *** assembling procedure can then use matrix/vector products on small size *** experiments show that our implementation is fast,scalable with respect to time,and outperforms existing vectorized MATLAB FEM codes.

关键词： MATLAB code vectorization finite element stiffness matrix mass matrix

A REVIEW OF TACTICAL PLANNING MODELS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2008年第2期17卷 204-229页

作者： Michael COMELLI Michel GOURGAND David LEMOINE Blaise Pascal University-Clermont Ferrand LIMOS UMR 6158 campus des Cézeaux 63173 Aubiere cedexFrance

The aim of this paper is to give an overview on models and methods used to solve tactical planning problems. The modeling and the elaboration of the well-know tactical planning problems （master planning ＆ scheduling, material requirement planning and multi-site planning） are discussed. These problems are modeled from two ＂lot sizing＂ models called the Capacitated Lot Sizing Problem （CLSP） and Multi Level Capacitated Lot Sizing Problem （MLCLSP）. From both models, a lot of extensions has been proposed in the literature. The purpose of this paper is twofold： first, classifications of the CLSP and MLCLSP as well as their extensions are given. For each model, the major scientific contributions are mentioned. These classifications made from seventy papers give an overview of ＂lot sizing＂ models dedicated to the MPS, MRP and Multi-site and show the diversity of models. Second, from a classification, an analysis of methods used for each model is given. The instance size, best gap and reference for gap computation are given for each contribution, This work can be used to elaborate an optimization tool for tactical planning problematic such as Advanced Planning System.

关键词： Tactical planning lot sizing models resolution approach

Performance optimization of grid aggregation in spatial data warehouses

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2015年第12期8卷 970-988页

作者： Myoung-Ah Kang Mehdi Zaamoune François Pinet Sandro Bimonte Philippe Beaune limos-CNRS UMR 6158 ISIMAUniversitéBlaise PascalAubièreFrance Irstea UR TSCFClermont-FerrandFrance Agaetis Clermont-FerrandFrance

The problem of storage and querying of large volumes of spatial grids is an issue to *** this paper,we propose a method to optimize queries to aggregate raster grids stored in *** our approach,we propose to estimate the exact result rather than calculate the exact *** approach reduces query execution *** advantage of our method is that it does not require implementing or modifying functionalities of database management *** approach is based on a new data structure and a specific model of SQL *** work is applied here to relational data warehouses.

关键词： data warehouse database modelling geographical information system

Responses of Iron-Reducing Bacteria to Salinity and Organic Matter Amendment in Paddy Soils of Thailand

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2012年第3期22卷 375-393页

作者： A.J.BONGOUA-DEVISME C.MUSTIN J.BERTHELIN Laboratory of Microorganism-Mineral-Organic Matter interactions in Soil (limos) Nancy-UniversityB.P.7023954506 Vandoeuvre-les-Nancy (France) National Center of Scientific Research (CNRS)-Laboratory of Microorganism-Mineral-Organic Matter Interactions in Soil (limos) UMR 7137CNRSNancy-UniversityB.P.7023954506 Vandoeuvre-les-Nancy (France)

In paddy soils of Thailand, the addition of organic matter （OM） is used to efficiently limit the effect of salinity on rice culture and production. OM used as an amendment and fertilizer promotes the reduced condition and increases iron solubilization without provoking ferrous toxicity. In this study, the intricate biogeochemical role of iron-reducing bacteria （IRB） involved in the quality of water and soil of paddy fields, particularly when the paddy fields were subject to salinity and organic matter addition, were studied in paddy fields of Thailand. The results demonstrated that the addition of OM increased the proliferation of cultivable IRB and their specific activity. Cultivable IRB communities decreased in the presence of salt. The presence of salt modified the structure of the bacterial populations by favoring the development of alkaline and moderately halophilic bacteria （Virgibacillus spp., Occanobacillus spp., and PaenibaciUus spp.）. The paddy soils studied contained very diversified （halosensitive, halotolerant, and halophilic） IRB populations that could be adapted to a variety of salinity conditions （0-90 g L-1 NaCI） using different organic substrates （glucose, acetate, and soil organic matter） to maintain significant activities under extreme conditions of salinity. The rhizosphere of rice stimulated IRB community growth without organic matter, whereas organic matter addition limited the rhizosphere effect on IRB cultivable number in saline condition. The interactive action of salinity and organic amendment had a negative impact on the rhizosphere effect. The presence of specific iron-reducing populations （fermentative, iron-respiring, anaerobic, and facultative anaerobic）, having different behaviors under salt and redox stresses, appeared to be a key factor that contributed to the control or enhancement of the quality of water and soil in paddy fields.

关键词： bacterial communities bacterial populations organic substrates paddy fields rhizosphere

Enhancing the reusability and interoperability of artificial neural networks with DEVS modeling and simulation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2016年第2期7卷 88-108页

作者： David Ifeoluwa Adelani Mamadou Kaba Traore Department of Computer Science African University of Science and Technology AbujaNigeria limos CNRS UMR 6158 Universit´e Blaise PascalClermont-Ferrand 2 Campus des Cezeaux63173 Aubiere

Artificial neural networks(ANNs),a branch of artificial intelligence,has become a very interesting domain since the eighties when back-propagation(BP)learning algorithm for multilayer feed-forward architecture was introduced to solve nonlinear *** is used extensively to solve complex nonalgorithmic problems such as prediction,pattern recognition and ***,in the context of a holistic study,there may be a need to integrate ANN with other models developed in various paradigms to solve a *** this paper,we suggest discrete event system specification(DEVS)be used as a model of computation(MoC)to make ANN models interoperable with other models(since all discrete event models can be expressed in DEVS,and continuous models can be approximated by DEVS).By combining ANN and DEVS,we can model the complex configuration of ANNs and express its internal ***,we are extending the DEVS-based ANN proposed by Toma et al.[A new DEVS-based generic art-ficial neural network modeling approach,The 23rd European Modeling and Simulation Symp.(Simulation in Industry),Rome,Italy,2011]for comparing multiple configuration parameters and learning algorithms and also to do *** DEVS models are described using the high level language for system specification(HiLLS),[Ma¨ıga et al.,A new approach to modeling dynamic structure systems,The 29th European Modeling and Simulation Symp.(Simulation in Industry),Leicester,United Kingdom,2015]a graphical modeling language for *** developed platform is a tool to transform ANN models into DEVS computational models,making them more reusable and more interoperable in the context of larger multi-perspective modeling and simulation(MAS).

关键词： Artificial neural networks DEVS Z-schema reusability interoperability HiLLS learning algorithm modeling and simulation

The high level language for system specification: A model-driven approach to systems engineering

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2016年第1期7卷 180-214页

作者： Hamzat Olanrewaju Aliyu Oumar Maıga Mamadou Kaba Traore School of Information and Communication Technology Federal University of Technology Minna Gidan-Kwanu Campus MinnaNigeria Universit´e des Sciences des Techniques et des Technologies BamakoMali limos CNRS UMR 6158 Universite Blaise Pascal Clermont-FerrandFrance

We present HiLLS(High Level Language for System Specification),a graphical formalism that allows to specify Discrete Event System(DES)models for analysis using methodologies like simulation,formal methods and ***’syntax is built from the integration of concepts from System Theory and Software Engineering aided by simple concrete notations to describe the structural and behavioral aspects of *** paper provides the syntax of HiLLS and its simulation semantics which is based on the Discrete Event System Specification(DEVS)*** DEVS-based Modeling and Simulation(M&S)perspective,HiLLS is a platform-independent visual language with generic expressions that can serve as a front-end for most existing DEVS-based simulation environments with the aid of Model-Driven Engineering(MDE)*** also suggests ways to fill some gaps in existing DEVS-based visual formalisms that inhibit complete specification of the behavior of complex *** provide a case study to illustrate the core features of the language.

关键词： HiLLS modeling and simulation integrated formalism DEVS Object-Z

Software Implementations of Elliptic Curve Cryptography in Wireless Sensor Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

通讯和计算机（中英文版） 2012年第6期9卷 712-720页

作者： Hilal Houssain Mohamad Badra Turki F. AI-Somani Computer Engineering Department Umm Al-Qura University Makkah Saudi Arabia limos Laboratory CNRS France

Predicting missing Energy Performance Certificates:Spatial interpolation of mixture distributions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and AI 2024年第2期16卷 200-212页

作者： Marc Grossouvre Didier Rullière Jonathan Villot Mines Saint-Etienne CNRSUMR 6158 LIMOSInstitut Henri FayolDepartement GMIEspace Fauriel29 rue PonchardierSaint-Etienne42023France U.R.B.S.SAS Bâtiment des Hautes Technologie20 Rue Professeur Benoit LAURASSaint-Etienne42000France Mines Saint-Etienne Univ Clermont AuvergneCNRSUMR 6158 LIMOSInstitut Henri FayolEspace Fauriel29 rue PonchardierSaint-Etienne42023France Mines Saint-Etienne Univ LyonCNRSUniv Jean MonnetUniv Lumiere Lyon 2Univ Lyon 3 Jean MoulinENS LyonENTPEENSA LyonUMR 5600 EVSInstitut Henri FayolSaint-Etienne42023France

Mass renovation goals aimed at energy savings on a national scale require a significant level of public financial *** identify target buildings,decision-makers need a thorough understanding of energy *** Performance Certificates(EPC)provide information about areas of space,such as land plots or a building’s footprint,without specifying exact *** cover only a fraction of *** paper demonstrates that learning from observed EPCs to predict missing ones at the building level can be viewed as a spatial interpolation problem with uncertainty both on input and output *** Kriging methodology is applied to random fields observed at random locations to determine the Best Linear Unbiased Predictor(BLUP).Although the Gaussian setting is lost,conditional moments can still be *** are admissible,even with missing *** present applications using both simulated and real data,with a specific case study of a city in France serving as an example.

关键词： Climate governance Energy efficiency Multi-scale processes Areal data Change of support

A Technical Note for a Shor’s Algorithm by Phase Estimation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Quantum Computing 2022年第2期4卷 97-111页

作者： Gérard Fleury Philippe Lacomme UniversitéClermont-Auvergne Clermont-Auvergne-INPLIMOS–UMR CNRS 61581 rue de la Chébarde63178Aubière CedexFrance

The objective of this paper concerns at first the motivation and the method of Shor’s algorithm including remarks on quantum computing introducing an algorithmic description of the *** corner stone of the Shor’s algorithm is the modular exponentiation that is themost computational component(in time and space).A linear depth unit based on phase estimation is introduced and a description of a generic version of a modular multiplier based on phases is introduced to build block of a gates to efficient modular exponentiation *** proposal includes numerical experiments achieved on both the IBM simulator using the Qiskit library and on quantum physical optimizers provided by *** shor’s algorithm based on phase estimation succeeds in factoring integer numbers with more than 35 digits using circuits with about 100 qubits.

关键词： Shor’s algorithm phase