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Data flow diagrams model

Data flow diagrams model system behaviors that a system must perform, along with the interconnections between the behaviors, including all inputs and outputs along with the data stores that each behavior path must access. These diagrams are useful for system design, as well as for system safety HA. [Pg.86]

Process Modeling Using Data Flow Diagrams... [Pg.99]

Without an adequate structure in the documentation of requirements, it is not possible to provide the developers with the information they need for creating a complex system. A requirements specification provides a complete description of the functionality of the system to be developed. It also includes non-functional requirements describing constraints. The documentation will typically be structured in a hierarchical way, providing sections and subsections for different levels of requirements [9]. The hierarchy can be based on a modeling approach used for the system development, e.g. usage scenarios or data flow diagrams. [Pg.115]

Diagrams are an efficient way to portray the model stmctme. The types of diagram that are suitable are data-flow-diagrams , which show the relationships between functions (the data flows) or function flow diagrams that portray relationships on the basis of variables (the relationships between the data are the functions). In this example, data flow diagrams, also called information flow diagrams will be used. They relate closely to the input-output models that were used in a previous phase. The functions in the model for the description of the dynamic behavior are differentia equations and additional equations. These equations contain parameters. [Pg.9]

Diagrams are a good means to illustrate these deliverables the environmental model is illustrated by a context diagram showing the connections with the environment, the behavioral model is supported by data-flow diagrams showing the functions and internal structure and also for simulations often graphical tools are used. [Pg.16]

The behavioral model is the internal model of the process, which indicates how the outputs are determined from the inputs, given the assumptions that have been made. The behavioral model will be developed further by using data flow diagrams. This will clarify the model structure and ensure consistency and completeness of the model. [Pg.71]

The behavioral model is based on the environmental model and consists of hierarchical data flow diagrams, supplemented by functional descriptions (equations), assrrmptions and optionally a list (data-dictionary) of all the variables and constants. [Pg.71]

A process unit could consist of one or more pieces of equipment. If an environmental model was developed for a combination of pieces of equipment, as a first step a division cottld be made into sub-models. One sub-model wottld then describe the behavior of one piece of equipment. The model that shows the interaction between the sub-models is the hierarchically highest data flow diagram. [Pg.71]

The tray behavior can be decomposed further to show the sub-processes (Fig. 16.4). For the top and bottom similar data flow diagrams apply. The inputs and outputs of this data flow diagram are consistent with the inputs and outputs of the tray process in the column model. The diagram can be read clockwise from the bottom left to the bottom right ... [Pg.221]

During the framework design phase (Fig. 30.4), first principles, process type conceptions and process expertise are combined to form a physical framework. In addition, the parameters that will be modeled by sub-models have to be identified. The output of each sub-model is the parameter concerned. However, independent variables are not always clear. It may be necessary that those input variables are determined by means of a sensitivity analysis. The conceivable candidates for these independent variables are all state and control variables used in the framework. In this example fuzzy logic will be used to build these sub-models, but other black-box modehng techniques, which are discussed in the previous chapters, such as, for example neural networks, may also be appropriate. The result of the framework design phase is the framework, which can be represented by a behavioral model. This is a data flow diagram of the model stmcture. [Pg.416]

Although the results for fhe on pafenf stage are shown in Figure 35.18, the dynamic model can capture the resulting data from any of the defined phases in the stock/flow diagram. The results of this type of Monte Carlo simulation can be analyzed to produce a series of useful metrics, such as ... [Pg.650]

The simulation flow diagram and optimization sequences of the process units for different products were examined. A relational data bases which including input component data base and process parameters data base as well as simulation results data base were developed. In this paper knowledge based process simulation and design of the starch plant were developed. The relational data bases system was linking with simulation models and simulation interface. The obtained results in this paper can be applied in the others domain. [Pg.294]

Figure 8.8 Flow diagram for involvement of pharmacokinetic and pharmacodynamic mode/computer-generated feedback into the iterative process of drug discovery from medicinal chemistry to the decision to enter phase II trials. This is not a comprehensive flow diagram for all aspects of drug discovery - it is restricted to the components of the process discussed in this chapter. This flow diagram emphasizes efficient involvement of in vitro and in vivo experimental science and computer modeling, in review of data obtained in phase I studies, in the decisions related to selection of the best compound for patient studies... Figure 8.8 Flow diagram for involvement of pharmacokinetic and pharmacodynamic mode/computer-generated feedback into the iterative process of drug discovery from medicinal chemistry to the decision to enter phase II trials. This is not a comprehensive flow diagram for all aspects of drug discovery - it is restricted to the components of the process discussed in this chapter. This flow diagram emphasizes efficient involvement of in vitro and in vivo experimental science and computer modeling, in review of data obtained in phase I studies, in the decisions related to selection of the best compound for patient studies...
The simulator framework CHEOPS couples different simulators at runtime. CHEOPS requires an input file which describes the simulation models and simulators for the components of the overall process, as well as their dependencies. Based on this information, CHEOPS starts the simulators in the correct order. In the case of feedback loops. CHEOPS iterates the simulation runs until a steady state is readied. The input file for CHEOPS is created by an integrator tool which operates on multiple data sources (product management database, integration documents, and the flow diagram). [Pg.56]

AHEAD stores more coarse-grained data about design documents which are needed for management purposes. Technical process flow diagrams are represented within the product model of AHEAD as product versions which are interconnected by dependency relationships. [Pg.521]

Relationships defined in CLiP models can be reflected in class diagrams by introducing new associations between classes. Currently, this is not possible in our approach, as only a limited set of default associations has been implemented to connect classes, like associations denoting control flow relationships or data flow relationships. We use UML stereotypes to define the type of an association link between two classes. Up to now, other relationships, e.g., those with a more semantical character, are neglected, although their integration is easily possible by simply using additional UML stereotypes as annotations for associations. [Pg.625]

The integrator platform is intended to be used for Comos PT related data integration, e.g. for keeping simulation models and process flow diagrams consistent. This comprises internal data as well as external data sources. The integrator platform has to fulfill all requirements on integration tools as proposed in Subsect. 3.2.1. The key requirements are ... [Pg.700]

After completion of the detailed planning, the results (P I flow diagram, technical data sheets, etc.) are summarized and pictorialized. For this purpose a model of the plant is prepared (plastic or CAD model). On the basis of this model construction of the plant with all auxiliary units is begun (Table 5.1-3). [Pg.312]


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