Object-Oriented Modeling Simulation and Control of Activated Sludge Process

Object-oriented modeling is spreading in current simulation of wastewater treatments plants through the use of the individual components of the process and its relations to define the underlying dynamic equations. In this paper, we describe the use of the free-software OpenModelica simulation environment for the object-oriented modeling of an activated sludge process under feedback control. The performance of the controlled system was analyzed both under normal conditions and in the presence of disturbances. The object-oriented described approach represents a valuable tool in teaching provides a practical insight in wastewater process control field.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Object oriented design of petri net simulator

Petri nets are highly useful for modeling discrete event dynamic systems. The objective of this effort is to develop a tool for drawing, editing and simulating Petri nets using object oriented programming on a standard platform. The object oriented approach was chosen because of its code reuse and extendability features which simplify the task of adding features to the tool as the model evolves. The design stresses on modeling of the problem by objects which closely relate the system design with the implementation. C++ is used for implementing the object oriented design, and the XView toolkit is used for building the graphical editor in compliance with AT&T\u27s OPENLOOK standards on a Sun Sparc IPX running SunOS 4.1.2. The object oriented paradigm was successfully applied to develop a user friendly, graphical editor and a simulator for Petri nets

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

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™ 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™ 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

Dynamic hybrid simulation of batch processes driven by a scheduling module

Simulation is now a CAPE tool widely used by practicing engineers for process design and control. In particular, it allows various offline analyses to improve system performance such as productivity, energy efficiency, waste reduction, etc. In this framework, we have developed the dynamic hybrid simulation environment PrODHyS whose particularity is to provide general and reusable object-oriented components dedicated to the modeling of devices and operations found in chemical processes. Unlike continuous processes, the dynamic simulation of batch processes requires the execution of control recipes to achieve a set of production orders. For these reasons, PrODHyS is coupled to a scheduling module (ProSched) based on a MILP mathematical model in order to initialize various operational parameters and to ensure a proper completion of the simulation. This paper focuses on the procedure used to generate the simulation model corresponding to the realization of a scenario described through a particular scheduling

Modeling and simulation of the short-term arterial pressure control system using an object oriented approach

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 simulation environment in the objectoriented modeling of the short-term arterial pressure control system when is applied to patients undergoing different situations as hemorrhage, liquid uptake or hemodialysis treatment. Results show the effectiveness of the baroreceptor control mechanism to compensate for the hypotension induced by the hemodialysis treatment. The described approach represents a valuable tool in the teaching of physiology for graduate medical and biomedical engineering students when facing to alternate hemodialysis treatment

Object Oriented Modeling Of Social Networks

The aim of this paper is to explain principles of object oriented modeling in the scope of modeling dynamic social networks. As such, the approach of object oriented modeling is advocated within the field of organizational research that focuses on networks. We provide a brief introduction into the field of social networks and present an overview of existing network modcls and methods. Subsequently wc introduce an clementmy problem field in thc social scicnces in gcncral, and in studies of organizational change and design in particular: the micro-macro link. We argue that the most appropriate way to handle this problem is the principle of methodological individualism. For social network analysis, to contribute to this theoretical perspective, it should include an individual choice mechanism and become more dynamically oriented. Subsequently, object oriented modeling is advocated as a tool to meet these requirements for social network analysis. We show that characteristics of social systems that are emphasized in the methodological individualistic approach have their direct equivalences in object oriented modeIs. The link between the micro level where actors act, and the macro level where phenomena occur as a consequence and cause of these actions, can be modelled in a straightforward way

Paper Session II-B - Simulating Shuttle and Derivative Vehicle Processing at Kennedy Space Center

Rockwell International Space Systems Division is teamed with the University of Central Florida on a research project to develop an automated simulation system to model ground processing scenarios for the Shuttle and Shuttle-derived vehicles. This simulation system is necessary to evaluate launch site facilities requirements and estimate life-cycle costs of future space programs. This paper presents the results of initial simulation modeling of the orbiter processing critical path at Kennedy Space Center (KSC). An approach is presented for the planned capabilities to simulate mixed fleet processing and to perform sensitivity, capacity, cost, and risk analyses. Potential expert system applications for the simulation system are presented, such as a resource allocation tool for standdown periods or a long-range scheduling tool for future programs like the Space Exploration Initiative. The simulation model will be developed using the object-oriented languages MOD SIM II and C+ + . This model is different than other software tools currently used for planning at KSC in that it is stochastic rather than deterministic. A deterministic model assumes all parameters of the model are known constants. A stochastic system defines the operations process using an indexed collection of random variables. The modeling system will be expandable using object-oriented inheritance techniques in which facilities and vehicles are modeled as templates. This system is different from other planning systems used at KSC in that supplemental vehicle and/or facility data can be introduced during program execution. This technique allows effective modeling of dynamic launch site environments for future programs

UML modeling for traveling salesman problem based on genetic algorithms

The major purpose of this paper is to present a way of solving problems through so-called visual planning and programming using object-oriented concepts. This paper describes the process of UML modeling for solving the traveling salesman problem using one of the metaheuristic-genetic algorithms. The analysis and problem solving in this way has many advantages just because it provides a clear definition of requirements and specific plan that we will later use to create specific applications. This is a good way to resolve because the UML describes the source code, models help to visualize the system as it is or what it should be and allow you to determine the structure and behavior of the system. Static and dynamic diagrams implemented in developing tools for modeling, as well as a description of specific applications and testing are mentioned. With this approach we describe modeling tool that can be used in the development of specific solutions and a way of establishing explicit links between concepts and execution code

UML-F: A Modeling Language for Object-Oriented Frameworks

The paper presents the essential features of a new member of the UML language family that supports working with object-oriented frameworks. This UML extension, called UML-F, allows the explicit representation of framework variation points. The paper discusses some of the relevant aspects of UML-F, which is based on standard UML extension mechanisms. A case study shows how it can be used to assist framework development. A discussion of additional tools for automating framework implementation and instantiation rounds out the paper.Comment: 22 pages, 10 figure