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object oriented modeling and decision support for supply chains

EUROPEAN JOURNAL OF OPERATIONAL RESEARCH 2004年第3期153卷 704-726页

作者： Biswas, S Narahari, Y Indian Inst Sci Elect Enterprises Lab Bangalore 560012 Karnataka India

Numerous algorithms and tools have been deployed in supply chain modeling and problem solving. These are based on stochastic models, mathematical programming models, heuristic techniques, and simulation. Since different decision problems in supply chains entail different approaches to be used for modeling and problem solving, there is a need for a unified approach to modeling supply chains so that any required representation can be created in a rapid and flexible way. In this paper, we develop a decision support system DESSCOM (decision support for supply chains through object modeling) which enables strategic, tactical, and operational decision making in supply chains. DESSCOM has two major components: (1) DESSCOM-MODEL, a modeling infrastructure comprising a library of carefully designed generic objects for modeling supply chain elements and dynamic interactions among these elements, and (2) DESSCOM-WORKBENCH, a decision workbench that can potentially include powerful algorithmic and simulation-based solution methods for supply chain decision-making. Through DESSCOM-MODEL, faithful models of any given supply chain can be created rapidly at any desired level of abstraction. Given a supply chain decision problem to be solved, the object oriented models created at the right level of detail can be transformed into problem formulations that can then be solved using an appropriate strategy from DESSCOM-WORKBENCH. We have designed and implemented a prototype of DESSCOM. We provide a real-world case study of a liquid petroleum gas supply chain to demonstrate the use of DESSCOM to model supply chains and enable decision-making at various levels. (C) 2002 Elsevier B.V. All rights reserved.

关键词： modeling simulation optimization supply chain management decision support system object oriented modeling

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pyFOOMB: Python framework for object oriented modeling of bioprocesses

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ENGINEERING IN LIFE SCIENCES 2021年第3-4期21卷 242-257页

作者： Hemmerich, Johannes Tenhaef, Niklas Wiechert, Wolfgang Noack, Stephan Forschungszentrum Julich Inst Bio & Geosci IBG 1 Biotechnol D-52425 Julich Germany Rhein Westfal TH Aachen Computat Syst Biotechnol AVT CSB Aachen Germany Forschungszentrum Julich Bioecon Sci Ctr BioSC Julich Germany

Quantitative characterization of biotechnological production processes requires the determination of different key performance indicators (KPIs) such as titer, rate and yield. Classically, these KPIs can be derived by combining black-box bioprocess modeling with non-linear regression for model parameter estimation. The presented pyFOOMB package enables a guided and flexible implementation of bioprocess models in the form of ordinary differential equation systems (ODEs). By building on Python as powerful and multi-purpose programing language, ODEs can be formulated in an object-oriented manner, which facilitates their modular design, reusability, and extensibility. Once the model is implemented, seamless integration and analysis of the experimental data is supported by various Python packages that are already available. In particular, for the iterative workflow of experimental data generation and subsequent model parameter estimation we employed the concept of replicate model instances, which are linked by common sets of parameters with global or local properties. For the description of multi-stage processes, discontinuities in the right-hand sides of the differential equations are supported via event handling using the freely available assimulo package. Optimization problems can be solved by making use of a parallelized version of the generalized island approach provided by the pygmo package. Furthermore, pyFOOMB in combination with Jupyter notebooks also supports education in bioprocess engineering and the applied learning of Python as scientific programing language. Finally, the applicability and strengths of pyFOOMB will be demonstrated by a comprehensive collection of notebook examples.

关键词： bioprocess modeling object oriented modeling ODEs Python

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modeling Order Effects on Errors in object oriented modeling for Machine and Plant Automation from an Educational Point of View

Modeling Order Effects on Errors in Object Oriented Modeling...

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16th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Vogel-Heuser, Birgit Braun, Steven Obermeier, Martin Sommer, Kerstin Seidel, Tina Johannes, Christine Tech Univ Munich Inst Automat & Informat Syst Boltzmannstr 15 D-85748 Garching Germany Tech Univ Munich TUM Sch Educ D-80799 Munich Germany

ISBN: (纸本)9781457700187

Our goal is to improve the handling of new possibilities given through object-oriented extension of the IEC 61131-3 programming techniques. We already know that modeling of structure is a challenge for automation engineers and often neglected. In an interdisciplinary research team we examined whether the modeling order with the Unified modeling Language (UML) class diagram for the structural aspect and the UML state chart diagram for the behavioral aspects cause significant differences in model quality. Additionally, often occurring errors were analyzed to find hindering factors in modeling and to learn what was misunderstood. Therefore we combine usability aspects, notational and procedural aspects in PLC programming with learning and educational aspects to find how education and application of modeling notations could be improved.

关键词： Automation Education IEC 61131-3 programming techniques IEC standards IEC standards object oriented modeling PLC programming Programming profession UML class diagram UML state chart diagram Unified modeling Language Unified modeling language education edu

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Research of Intrusion Detection System object oriented modeling 4

Research of Intrusion Detection System Object Oriented Model...

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4th International Conference on Applied Mechanics, Materials and Manufacturing (ICAMMM)

作者： Li, Linglin Tang, Jinpeng Hunan Commun Polytech Changsha Hunan Peoples R China

ISBN: (纸本)9783038352884

In order to intrusion detection system functional analysis easily and adapted to changing requirement, object oriented modeling technology is applied in Packet Capture System. The system architecture is proposed first, functional analysis is given for it s components. Static model and dynamic model are separately founded by united modeling language. An analysis of the advantages of the system is placed in the end.

关键词： Intrusion Detection object oriented modeling UML

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object oriented modeling framework of a Kohonen network based character recognition system

Object oriented modeling framework of a Kohonen network base...

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International Conference on Computer Communication and Informatics (ICCCI)

作者： Ruchi Shukla W A Clarke T Marwala Department of Electrical & Electronic Engineering Science University of Johannesburg South Africa Faculty of Engineering and Built Environment University of Johannesburg South Africa

This paper presents an object-oriented modeling framework of a Kohonen network based character recognition system. The Kohonen network provides faster feature extraction and classification, more so when there are multiple languages present. The object-oriented modeling framework is likely to assist in the development of a meta-model for multi-lingual character recognition.

关键词： Character recognition object oriented modeling Unified modeling language Training Handwriting recognition Hidden Markov models Computers

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object oriented modeling of configuration management in global networks

Object oriented modeling of configuration management in glob...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： S. Civanlar M.V. Ramana J. Mall AT and T Bell Laboratories Inc. Holmdel NJ USA Operations Division AT and T International Morristown NJ USA

In our current environment, the international telecommunications network is a static union of bi-laterally owned disjoint subnetworks managed and operated pairwise by carriers with capacity engineered for peak traffic resulting in very low utilization at off-peaks. This paper describes an innovative configuration management infrastructure by which the bi-laterally owned subnetworks can be reconfigured at the facility layer to mimic a multi-lateral network. The proposed dynamic capacity reassignment exploits the time-of-day capacity usage due to time-zone differences between carriers. Network robustness and efficiency are enhanced by shifting the unused bi-laterally owned capacity in the network periodically or during demand surges to meet the network load. Such capacity shifts require coupling between the transport and switching layers to ensure that the reconfigured capacity is cleared of calls. This paper focuses on the object oriented information modeling of capacity management in the context of a two-tier network management system by which the technological disparities of bi-lateral subnetworks are made invisible. This object model is based on the CCITT TMN X-interface and interpreted for the specific application. To our knowledge, this is the first such exploitation of TMN.

关键词： object oriented modeling Technology management Environmental management Telecommunication network management Engineering management Telecommunication traffic Traffic control Innovation management Robustness Surges

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object oriented modeling of a multiple-input multiple-output flyback converter in Dymola

Object oriented modeling of a multiple-input multiple-output...

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IEEE Workshop on Computers in Power Electronics

作者： N.D. Benavides P.L. Chapman Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign IL USA

modeling of power electronic converters does not lend itself to many traditional circuit simulators such as SPICE. The state equations of a converter change with switching behavior, also called events, which must be determined using an iterative solution. Diode commutation is a prime example that occurs in nearly all complex power electronic circuits. The language examined in this paper, Modelica, was developed for solution of systems with discrete events such as switching. A multiple-input, multiple-output (MIMO) flyback converter has been used as an example, and compared to experimental results.

关键词： object oriented modeling MIMO Equations Switches Circuit simulation SPICE Power system modeling Power electronics Switching converters Diodes

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object oriented modeling of an Interior Permanent Magnet Synchronous Motor Drives for Dynamic Simulation of Vehicular Propulsion

Object oriented modeling of an Interior Permanent Magnet Syn...

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IEEE Conference on Vehicle Power and Propulsion (VPPC)

作者： Wootaik Lee Jung-Pyo Hong Department of Control and Instrumentation Engineering Changwon NatE28099l University Changwon Gyeongnam South Korea

This paper describes an object oriented modeling technique of an interior permanent magnet synchronous motor (IPMSM) drives for a dynamic simulation of a hybrid vehicle propulsion system. In order to enhance reusability of the model, each part of an IPMSM drive system is modeled in an object-oriented manner according to the physical partitioning of the drive system. This model allows comprehensive analysis of the IPMSM drive, including torque fluctuation of IPMSM, switching strategies of an inverter, and complex algorithm of a controller and it is also possible to simulate in a simplified way for a reduced computation time without considering switching patterns of an inverter. This model is implemented in Simulink environment, which is a de facto standard tool in control and system engineering, and is easily integrated with other models of hybrid propulsion system. By use of the developed model, fundamental characteristics of IPMSM drive system were investigated and the simulation results show its practical effectiveness.

关键词： object oriented modeling Permanent magnet motors Vehicle dynamics Propulsion Inverters Vehicle driving Pattern analysis Magnetic analysis Algorithm design and analysis Fluctuations

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object oriented modeling and simulation of process plants with discrete logic controls

Object oriented modeling and simulation of process plants wi...

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International Symposium and Workshop on Systems Engineering of Computer Based Systems

作者： K.K. Ghosh R. Chatterjee Department of Electrical Enginleering Jadavpur University Calcutta India Jadavpur University Kolkata West Bengal IN Dept. of Electr. Eng. Jadavpur Univ. Calcutta India

The paper describes the techniques for using object oriented methodologies for modeling and simulation of process plants and their control systems employing discrete logic controls. Based on this approach, an object oriented application framework has been developed using C++. As a case study, a fluid flow control system for a chemical process plant has been implemented using the framework. It was found to be easy to implement and modify. The techniques described in the paper may be reused in similar problems.

关键词： object oriented modeling Logic Fluid flow control Computational modeling Application software Buildings Modems Software maintenance Humans Control system synthesis

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object oriented modeling of a squirrel cage induction motor

Object oriented modeling of a squirrel cage induction motor

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Annual Conference of Industrial Electronics Society

作者： S. Bazine K. Jelassi G. Champenois S. Tnani Ecole Nationaled Ingenieursde Tunis Laboratoiredes Systemes Electriques LSE-ENIT Tunis Tunisia Ecole Superieured Ingenieursde Poitiers Laboratoire de Automatiqueetd Informatique Industriellede Poitiers Poitiers France

In this paper, the authors propose a new modeling approach to describe a squirrel cage induction machine using object oriented methodology. Our goal is to provide a simulation kernel that generates automatically electrical parameters matrices (resistance, inductance and mutuals matrix). This approach is mainly based on decomposing the induction motor into elementary objects that abstract real world components' behavior and interactions. Thus we provide a generic induction motor simulation toolbox (IMST) including a set of basic modeling objects and a simulator kernel. Our model has been validated by comparing data supplied by simulator to those measured on a real faulty squirrel cage induction motor

关键词： object oriented modeling Induction motors Kernel Rotors Bars Induction machines Matrix decomposition Circuit faults Stator windings Torque

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