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AN object-oriented modeling FRAMEWORK FOR SAWMILL SIMULATION

COMPUTERS & INDUSTRIAL ENGINEERING 1993年第1-4期25卷 565-568页

作者： RANDHAWA, SU BRUNNER, CC FUNCK, JW ZHANG, GC LUCIDYNE TECHNOL INC SAN DIEGOCA

This paper describes a flexible, general-purpose simulation environment for sawmill modeling and analysis. The system represents a library of objects developed in an object-oriented framework. The objective is to develop a system that can be used to model different sawmill configurations, to identify manufacturing process constraints, and to evaluate control strategies and management practices.

关键词： SIMULATION object-oriented modeling SAWMILLS

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Routing Nutrient Concentrations in a River Reach Using an object-oriented modeling Based on the Concepts of System Dynamics

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WATER CONSERVATION SCIENCE AND ENGINEERING 2020年第3-4期5卷 169-186页

作者： Ghashghaie, Maryam Ostad-Ali-Askari, Kaveh Eslamian, Saeid Bagheri, Ali Sarang, Amin Bu Ali Sina Univ Fac Agr Dept Water Resources Engn Hamadan Hamadan Iran Isfahan Univ Technol Coll Agr Water Engn Dept Esfahan *** Iran Isfahan Univ Technol Coll Agr Dept Water Engn Esfahan Iran Tarbiat Modares Univ Dept Water Resources Engn Tehran Iran Univ Tehran Environm Fac Tehran Iran

Nitrogen (N) and phosphorous (P) are key nutrients in eutrophication. This phenomenon has been mostly studied in lakes and reservoirs. Eutrophication could not be controlled in lakes and reservoirs due to water stationarity. In order to mitigate the rate of eutrophication, we should determine specific points in a river reach and control the rate of eutrophication by implementing possible solutions. Also we should take into account as many as possible sources of nutrients entering into water bodies in a watershed scale including farm lands and waste water to determine the point of effect in decision-making. To reach this aim, an object-oriented modeling approach based on the concepts of system dynamics (SD) is used in this paper. It aims to build a model capable of considering dynamic feedback loops influencing the flow of nutrients in a watershed for managerial purposes. A watershed composed of different sub basins is set out as a system to configure its objects and their associations. Also physical rules are used as main equations to clarify the inter-relationships of different objects within the system. In this research, the qualitative feature refers to the amount of N and P parameters, which are the main factors of eutrophication phenomenon. The results of study show that the model is capable of estimating the value of discharge and the concentration of N and P in a river reach as well. The value of R-2 for both calibration and validation at Doab stations are 0.61, and 0.5 respectively. Also the value of R-2 is 0.73 and 0.65 for of N and P concentration, respectively.

关键词： Routing nutrients Nutrients (N P) object-oriented modeling System dynamics

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DIMENSIONS OF object-oriented modeling

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COMPUTER 1992年第10期25卷 12-20页

作者： WEGNER, P Dept. of Comput. Sci. Brown Univ. Providence RI

The problem-solving power of object-oriented and logic programming is discussed in terms of the dimensions of encapsulation, distribution concurrency, and reactiveness. Encapsulation and reactiveness are essential dimensions of object orientation; they support decentralized abstraction, interaction, and evolution of individual objects. Distribution is a strong two-way form of encapsulation, while concurrency reduces computation time and enhances modeling power. The fundamentals of object-oriented programming are reviewed

关键词： concurrency data encapsulation decentralized abstraction distribution encapsulation inheritance inheritance logic programming logic programming object-oriented modeling object-oriented programming object-oriented programming reactiveness

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object-oriented modeling of thoracic fluid balance to study cardiogenic pulmonary congestion in humans

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COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2019年 180卷 104998-000页

作者： Chuong Ngo Dahlmanns, Stephan Vollmer, Thomas Misgeld, Berno Leonhardt, Steffen Rhein Westfal TH Aachen Helmholtz Inst Biomed Engn Philips Chair Med Informat Technol Pauwelsstr 20 D-52074 Aachen Germany Philips GmbH Innovat Technol Pauwelsstr 17 D-52074 Aachen Germany

Background and objective: We hypothesized that a biophysical computational model implemented in an object-oriented modeling language (OOML) would provide physiological information and simulative data to study the development and treatment of cardiogenic pulmonary congestion. Methods: This work is based on the object-oriented cardiopulmonary interaction introduced in [1]. This paper describes the novel model components required to study cardiogenic pulmonary congestion: i) interstitial fluid exchange related to the Starling equation, ii) the lymphatic pump, and iii) the interconnection of these elements with the original cardiopulmonary model. The presented model succeeds in i) describing lymphatic flow at the capillary artery and venous end, ii) activation of the lymphatic pump at elevated pulmonary pressures, and iii) the simulation of the different safety factors related to lung tissue, osmotic gradient, and the lymphatic system during the development of lung congestion. Results: Simulations show a qualitative correlation between model behavior and physiological data from literature. The model also demonstrates the beneficial effect of continuous positive airway pressure therapy on fluid clearance and respiratory mechanics. Conclusion: This study demonstrates the successful use of OOML to describe the development of cardiogenic congestion by introducing a model of the lymphatic system and the thoracic fluid balance system, as well as connecting them to the existing cardiopulmonary model. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Cardiogenic congestion object-oriented modeling Cardiopulmonary interaction Matlab Simscape Fluid balance Starling equation Lymphatic system

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A DISCRETE-EVENT object-oriented modeling ENVIRONMENT FOR SAWMILL SIMULATION

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SIMULATION 1994年第2期62卷 119-130页

作者： RANDHAWA, SU BRUNNER, CC FUNCK, JW ZHANG, GC OREGON STATE UNIV DEPT FOREST PRODCORVALLISOR 97331 LUCIDYNE TECHNOL INC CORVALLISOR 97330

The paper presents a simulation modeling environment developed for sawmill design and analysis in the forest products industry. The design facilitates flexibility in modeling different sawmill configurations and production scenarios. The system represents a library of objects developed in an object-oriented framework. These include structures required to develop simulation models, to execute discrete event simulation, and for system-user interface.

关键词： SIMULATION object-oriented modeling SAWMILLS

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object-oriented modeling and simulation of the closed loop cardiovascular system by using SIMSCAPE

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COMPUTERS IN BIOLOGY AND MEDICINE 2013年第4期43卷 323-333页

作者： Fernandez de Canete, J. del Saz-Orozco, P. Moreno-Boza, D. Duran-Venegas, E. ETSI Ind Dept Ingn Sistemas & Automat Malaga 29071 Spain

The modeling of physiological systems via mathematical equations reflects the calculation procedure more than the structure of the real system modeled, with the simulation environment SIMULINK (TM) being one of the best suited to this strategy. Nevertheless, object-oriented modeling is spreading in current simulation environments through the use of the individual components of the model and its interconnections to define the underlying dynamic equations. In this paper we describe the use of the SIMSCAPE (TM) simulation environment in the object-oriented modeling of the closed loop cardiovascular system. The described approach represents a valuable tool in the teaching of physiology for graduate medical students. (c) 2013 Elsevier Ltd. All rights reserved.

关键词： object-oriented modeling Hierarchical modeling SIMULINK (TM) simulation language SIMSCAPE (TM) simulation language Cardiovascular system

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object-oriented modeling of Switching Moving Boundary Models for Two-phase Flow Evaporators

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IFAC Proceedings Volumes 2012年第2期45卷 1069-1074页

作者： Javier Bonilla Luis J. Yebra Sebastián Dormido François E. Cellier Centro de Investigaciones Energéticas MedioAmbientales y Tecnológicas (CIEMAT) - Plataforma Solar de Almería (PSA) Almería Spain National Distance Education University (UNED) Department of Computer Science and Automatic Control Madrid Spain Swiss Federal Institute of Technology (ETH Zurich) Department of Computer Science Zurich Switzerland

Abstract The present paper describes the design of switching moving boundary models for two-phase flow evaporators and the development of an object-oriented library written in the Modelica language. The main idea is to design basic models for each flow state: subcooled liquid, two-phase flow and superheated steam, applying the conservation laws. The design must be done in order that the basic models can be interconnected to create complete, flooded or dry-expansion evaporators depending on the particular case. The basic models should consider the balances of mass, energy and momentum, meanwhile the evaporator models should include mechanisms to switch between them, for example from a complete evaporator to a flooded evaporator in case that the superheated region becomes extinct. Several models currently exist although none of them include all the desirable features.

关键词： Moving boundary model two-phase flow evaporator switching object-oriented modeling

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object-oriented modeling and Optimal Control: A Case Study in Power Plant Start-Up

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IFAC Proceedings Volumes 2011年第1期44卷 9549-9554页

作者： Francesco Casella Filippo Donida Johan Åkesson Dipartimento di Elettronica ed Informazione Politecnico di Milano Milano Italy Dipartimento di Elettronica ed Informazione Politecnico di Milano and Motus s.r.l. Milano Italy Department of Automatic Control Lund University Lund Sweden and Modelon AB Lund Sweden

Abstract modeling and optimization of complex systems traditionally have required significant programming efforts in order to encode the model dynamics, the cost functions and the constraints in a format suitable for state of the art numerical algorithms. The availability of dedicated languages for physical modeling has made the design process simpler, but often tools have been limited to a particular optimization algorithm. In this paper, we present a case study where a combined cycle power plant model has been developed using first principles in the modeling language Modelica. Based on the model, an optimal control problem for the start-up of the power plant has been formulated in the Optimica extension and solved using the open source software http://*** . The results demonstrate how high-level modeling languages and tools can be used to bridge the gap between the engineering need for intuitive description formats and the interfaces of efficient numerical algorithms.

关键词： Nonlinear dynamic optimization Power plant control object-oriented modeling Modelica Optimica

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object-oriented modeling of multi media databases in UML

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AEJ - Alexandria Engineering Journal 2001年第4期40卷 489-504页

作者： Saad, A.A. Comp. Sci. and Automat. Contr. Dept. Faculty of Eng. Alexandria University Alexandria 21544 Egypt

This paper presents an object-oriented data model for Multimedia Databases. The model supports building Hierarchical Video Models and Composite Multimedia Presentations. It attacks the problems of Time-based Media that are the most complex in modeling Multimedia data. The model is presented in the Unified modeling Language UML that is the current standard for modeling object-oriented Systems. The abstract concepts of the model are represented by the Class Diagram and the System Functionality is illustrated by the Use Case Diagram. Also a Scenario for implementing a Use Case is illustrated by the Sequence Diagram. Finally, an example that illustrates how a Composite Multimedia Presentation can be modeled in the system is illustrated.

关键词： Content-based retrieval Multimedia databases object-oriented modeling Time-based media Unified modeling language

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A distributed object-oriented modeling method for agent-based intelligent manufacturing system

A distributed object-oriented modeling method for agent-base...

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6th International Conference for Young Computer Scientists

作者： Wang, YH Yin, CW Zhang, Y Tian, YT Chinese Acad Sci Shenyang Inst Automat Shenyang Peoples R China

ISBN: (纸本)7506251817

As an distributed and parallel processing mechanism, multi-agent systems offer a novel approach to handle complex tasks of intelligent manufacturing system (IMS). Considering there are some common properties between agents and objects, the object-oriented method is used to constructed the operational model for agent-based in this paper. Notions and methods of object-oriented model designing for MAS is proposed. Besides, the object-oriented system implementation technique for agent-based IMS is discussed at the end.

关键词： object-oriented modeling distributed object multi-agent system intelligent manufacturing system

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