Unique in its emphasis on the practical applications of systems evaluation methods and models, the book introduces several new evaluation models of grey system, including general grey incidence model, grey incidence models based on similarity and closeness, grey cluster evaluation based on triangular whitenization functions, and multiattribute grey target decision model. Grey relational analysis gra, also called dengs grey incidence analysis model, was developed by a chinese professor julong deng of huazhong university of science and technology. In systems engineering, information systems and software engineering, the systems development life cycle sdlc, also referred to as the application development lifecycle, is a process for planning, creating, testing, and deploying an information system. Research and application for grey relational analysis in. Grey system theorybased models in time series prediction. It combines elements of game theory, complex systems, emergence, computational sociology, multiagent systems, and evolutionary. Introduction to grey system theory research information ltd.
As soo n as thi s pa ckage was avail able, it wa s mo st we lcomed in the co. The classic grey theory does not adequately take into account the distribution of data set and lacks the effective methods to analyze and mine big sample in multigranularity. In 1982, julong deng initiated and established the grey systems theory. Several grey system models which used most commonly. Defining phm, a lexical evolution of maintenance and logistics. The conccept of the grey system, in its theory and successful application, is now well. A summary of grey forecasting and relational models and its. I am doing a thesis work where i want to test the gm1,1 forecasting model to predict errors. Particularly, the application of grey systems in marine economics is gaining. You can use the nlgreyest command to estimate the unknown idnlgrey model parameters and initial states using measured data. With the evolution of software development technology, changes in computer operation, and continued grey theory research progress, some of. Although various types of grey models can be mentioned, most of the previous researchers have focused their attention on gm1,1 models in their predictions because of its computational.
But the experts dont need to worry about losing their jobs just yet. Make sure if system is stable with zero bugs, all test criteria had been met, ensure environment setup etc. Grey number prediction using the grey modification model with. It defines situations with no information as black, and those with perfect information as white. We use the citespace software to extract the country, institutions. To build a differential modelso called grey model gmby using the. Purpose the purpose of this paper is to summarize the progress in grey system. Behavior can be described in terms of input sequences, actions, conditions, output and flow of data from input to output. Introduction to grey systems modeling software springerlink. Several problems need to be studied in grey system theory dora. For any new theory, the progress from its birth, growth to maturity requires a. New progress of grey system theory in the new millennium. In grey systems theory, gmn,m denotes a grey model, where n is the order of the difference equation and m is the number of variables. How to define and estimate linear grey box models at the command line.
Regression models and the greysystemtheorybased models are used to. Where do you find free or commercial software based on grey. To enable the grey model producing a grey number prediction, a progression. Furthermore, the grey system modeling software version 8. It is one of the most widely used models of grey system theory. Model based testing is a software testing technique where run time behavior of software under test is checked against predictions made by a model. The aims of grey system theory are to provide theory, techniques, notions and ideas for resolving analysing latent and intricate systems, for example.
The systems development life cycle concept applies to a range of hardware and software configurations, as a system can be composed of. Bing liu develop ed t he first grey systems model ing software fo r the windo ws using visualbasi c6. An agentbased model abm is a class of computational models for simulating the actions and interactions of autonomous agents both individual or collective entities such as organizations or groups with a view to assessing their effects on the system as a whole. Keywords grey systems theory, combined grey models, buffer operators. Currently, grey systems theory has been widely applied in areas like social science, economics, agriculture, meteorology, military science, etc. Currently, grey systems theory has been widely applied in areas like social science.
In view of the universality of the normal distribution, the normality grey number is proposed. Software development and testing methodologies with pros. This example shows how to estimate the heat conductivity and the heattransfer coefficient of a continuoustime grey box model for a heatedrod system. Greysystemtheorybased model for the prediction of track geometry. Software and systems modeling sosym is an international journal, publishing six issues yearly, that focuses on theoretical and practical issues in the development and application of software and system modeling languages, techniques, and methods, such as the unified modeling language. Integrated components form a whole system, this phase is performed to ensure whether the system is working as per the requirements, tracking and reporting the testing progress. Pdf several grey system models which used most commonly. Using nlgreyest to estimate nonlinear greybox models. Grey theory is an essential uncertain knowledge acquisition method for small sample, poor information. Leverhulme trust workshop on grey systems and applications. We define and explore in simulation several rules for the local evolution of. So, systems operational behaviors and their laws of evolution can be correctly. By grey system theory i mean the one defined by deng julong in 1982.
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