A flexible graphical user interface for performance modeling

Lin, Yi‐Bing; Daly, D.

doi:10.1002/spe.4380250206

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…Various authors discuss the design of graphical user interfaces for performance modeling tools. 8,9,10 HIERARCHICAL MASS STORAGE SYSTEMS This section gives a brief review of basic concepts in hierarchical mass storage systems. Figure 1 shows the structure of a typical storage hierarchy.…”

Section: Introductionmentioning

confidence: 99%

Pythia and Pythia/WK: tools for the performance analysis of mass storage systems

Pentakalos

Menascé

Yesha

1997

Softw: Pract. Exper.

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SUMMARYThe constant growth on the demands imposed on hierarchical mass storage systems creates a need for frequent reconfiguration and upgrading to ensure that the response times and other performance metrics are within the desired service levels. This paper describes the design and operation of two tools, Pythia and Pythia/WK, that assist system managers and integrators in making cost-effective procurement decisions. Pythia automatically buids and solves an analytic model of a mass storage system based on a graphical description of the architecture of the system, and on a description of the workload imposed on the system. The use of a modeling wizard to perform this conversion from a graphical description of a mass storage system to an analytic model makes Pythia unique among analytic performance tools. Pythia/WK uses clustering algorithms to characterize the workload from the log files of the mass storage system. The resulting workload characterization is used as input to Pythia.

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Section: Introductionmentioning

confidence: 99%

Pythia and Pythia/WK: tools for the performance analysis of mass storage systems

Pentakalos

Menascé

Yesha

1997

Softw: Pract. Exper.

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“…The aims were to introduce a number also used extensively in developing simulation packages that enable complex systems to be developed from Moreover, an evolutionary prototype should be developed using only those requirements which are clear and elementary components (building blocks). One such example has been described in detail in reference [16 ].…”

Section: Introductionmentioning

confidence: 99%

The development of novel control valve diagnostic software based on the Visual Basic programming language

Sharif

Grosvenor

2000

Proceedings of the Institution of Mechanical Engineers, Part I:

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A number of commercially available control valve fault diagnostic systems were considered by the authors and it was established that they produce test results that require specialist knowledge to interpret them fully and, therefore, to diagnose faults accurately in control valves. This provided the incentive to develop a graphical user-interface diagnostic program, as reported in this paper, which can be used easily by field technicians and operators to diagnose faults in control valves and actuators. A commercially available diagnostic system had been used to generate a large number of test results for various faults in a typical control valve and actuator. These results were incorporated into the newly developed control valve diagnostic program as its database. Then, when tests are conducted and available information is entered into the program, a diagnostic statement is produced. The statement is based on the comparison between the entered value for given valve performance parameters and those which are in the established database. In addition, an option was included which enables the user to import certain types of test data directly from the commercially available diagnostic system so that the condition of the control valve can be established with a higher degree of accuracy and without any additional hardware components. The diagnostic program has three options. They are as follows: determine condition, estimate condition and step response analysis. The determine condition option enables the types of fault to be determined with absolute certainty. However, this option can only be used if all the 12 valve performance parameters are known and are entered into the diagnostic program. On the other hand, the estimate condition option was developed in such a way that faults can be predicted when at least one of the valve's performance parameters is entered into the program. This is because, when the valve's performance parameters are entered and the estimate condition option is selected, the diagnostic result is produced in the form of a distribution table showing the conditions that are satisfied by the input variables (the performance parameters) and the extent to which each variable has satisfied the conditions. The step response analysis option enables the condition of a control valve and its actuator to be determined, either by importing test data that are produced when the control valve is cycled and the commercially available diagnostic system is used to monitor the valve stem position or by monitoring the pressure that is developed in the actuator's upper diaphragm casing, using a pressure transducer and a data acquisition system. The reliability and the accuracy of determining a number of faults within a control valve were established. Faults considered included the gradual blockage of the actuator's vent hole, damaged valve stem and damaged valve stem packing rings, and the accuracy of determining the type of fault was dependent on the selected diagnostic option. The paper concludes by providing result screens for a number of conditions using all the available options and outlines the limitations of the current version of the developed program.

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A graphical user interface design for network simulation

Lin

Geigel

1997

Journal of Systems and Software

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A flexible graphical user interface for performance modeling

Cited by 7 publications

References 3 publications

Pythia and Pythia/WK: tools for the performance analysis of mass storage systems

Pythia and Pythia/WK: tools for the performance analysis of mass storage systems

The development of novel control valve diagnostic software based on the Visual Basic programming language

A graphical user interface design for network simulation

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