A method for programming a computer system having a display console for displaying images to control at least one of a virtual instrument and an instrument by the steps of displaying on the screen at least one first function-icon that references at least one first control module for controlling at least one first function; displaying on the screen at least one iteration-icon that references iteration control module for controlling multiple iterations of data flow; displaying on the screen at least one first input variable-icon that references at least one first input variable; displaying on the screen at least one first output variable-icon that references at least one first output variable; and assembling on the screen a first acyclic data flow diagram including the at least one first function-icon and the at least one iteration-icon and the at least one first input variable-icon and the at least one first output variable-icon, such that the diagram displays a first procedure for producing at least one value for the at least one first output variable-icon from at least one value for the at least one first input variable-icon, and such that the at least one iteration-icon in the diagram indicates multiple iterations of the at least one first function in the course of the first procedure.

Graphical system for modelling a process and associated method

A distributed processing, interactive computer network and method of operation is described. The network is designed to provide very large numbers of simultaneous users access to large numbers of applications which feature interactive text/graphic sessions. The network includes one or more host computers having application data stores; a plurality of concentrator computers, also including application data stores, the concentrator computers being connected in groups of one of more to each of the host computers; and a plurality of reception system computers connected in groups of one or more to each of the concentrator computers, the reception system computers being arranged so that respective users can request interactive applications at the reception system computers. In accordance with the design, the reception system computers also include application data stores. The method for operating the network includes steps for generating the interactive text/graphic sessions from objects that include data and/or program instructions. Additionally, the method features steps for distributing objects among the data stores of the network computers, and, thereafter, permitting the reception system computer at which an application is requested to selectively collect objects required for the application from the network and the respective reception system so that the requested application may be presented at the reception system based on the objects collected. This operation decreases processing demand on the higher-level network elements, permitting them to function primarily as data supply and maintenance resources, thereby reducing network complexity, cost and response time.

Interactive computer network and method of operation

The paper presents the rationale for a functional simulation tool, called DEPEND, which provides an integrated design and fault injection environment for system level dependability analysis. The paper discusses the issues and problems of developing such a tool, and describes how DEPEND tackles them. Techniques developed to simulate realistic fault scenarios, reduce simulation time explosion, and handle the large fault model and component domain associated with system level analysis are presented. Examples are used to motivate and illustrate the benefits of this tool. To further illustrate its capabilities, DEPEND is used to simulate the Unix-based Tandem triple-modular-redundancy (TMR) based prototype fault-tolerant system and to evaluate how well it handles near-coincident errors caused by correlated and latent faults. Issues such as memory scrubbing, re-integration policies, and workload dependent repair times, which affect how the system handles near-coincident errors, are also evaluated. Unlike any other simulation-based dependability studies, the accuracy of the simulation model is validated by comparing the results of the simulations with measurements obtained from fault injection experiments conducted on a production Tandem machine.

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DEPEND: a simulation-based environment for system level dependability analysis

A graphical system for executing a process or for programming a computer to execute the process is based on graphical programming techniques. Techniques include composing a graphical front panel of an instrument which provides a means for the user to provide input and monitor outputs of the process, composing a data flow diagram using graphical representations of data flow structures, and in response to the data flow diagram and the panel diagram, composing a sequence of execution instructions to carry out the diagrammed process in response to inputs provided by the panel to supply outputs displayed by the panel. The system is based on libraries of executable functions and variable types having corrresponding icons. The user selects icons which have corresponding entries in the libraries to assemble the diagrams. The system is responsive to the diagram to select the corresponding executable functions and variable types, and interconnecting the selected functions and data types to compose an executable program.

Graphical system for executing a process and for programming a computer to execute a process, including graphical variable inputs and variable outputs

An object-oriented system for building graphical interfaces to programs is discussed. The system, called GROW, facilitates the process of creating interfaces that are highly interactive (including direct manipulation and animation), rich in layout structure, and effectively reusable across applications. These properties are achieved through three techniques: object-based graphics with taxonomic inheritance, interobject relationships such as composition and graphical dependency, and separation of the interface and application. Experience with interfaces for several applications has provided insights on the effectiveness of these techniques. First, object-oriented programming yields significant leverage on specializing and reusing interfaces. Second, layout constraints (such as maintaining the connectivity of a graph) can be managed with simple data dependencies among the attributes of the graphical objects. Finally, separating the interface and application is essential to reusing interface components. This paper describes the techniques in detail, gives examples of interfaces built with GROW, and summarizes experiences using GROW with a variety of applications.

An object-oriented approach to graphical interfaces

far the maos complex _ mm_ Low-cost, high-powered intelligent terminals and workstations equipped with high-resolution displays have recently made practical anew approach to simulation modeling-visual simulation. Traditional programming is no longer the mainstay of model specification: Users can employ extensive graphics to draw a model on a CRT screen and observe its behavior through animation and dynamically evolving statistics. Visual input and output serve to overcome many of the barriers that have prevented simulation from taking its rightful place as a convenient tool for system design. These capabilities are illustrated by the projected AT&T Performance Analysis Workstation, which combines visual and interactive features in a novel way.

Visual Simulation: The Performance Analysis Workstation

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Visual Simulation: The Performance Analysis Workstation