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(Pedgen 2007). In SimioTM, objects are built under the concept of object orientation. According to Pedgen (2007), object oriented programming is constructed “as a collection of cooperating objects that are instantiated from classes. These classes are designed using the core principles for abstraction, encapsulation, polymorphism, inheritance, and composition.” The abstraction principle can be explained as the principle to develop the classes’ structure as simple as possible. Encapsulation means that only the object can change its state. Polymorphism is the principle that gives messages or indications to trigger object actions. Inheritance allows the development of a more specialized class of an object by the property of sub-classing (an object deriving from another object). Finally, Composition permits the creation of new object classes by the combination of existing object classes (Pedgen 2007). In SimioTM, the object framework is created on the same basic principles of object oriented programming languages, though the principles are applied by a modeling framework instead of a programming framework (Pedgen 2007). The authors Sturrock and Pegden (2010) established the following example to better understand this concept: “The Microsoft development team that designed C# applied these basic principles in the design of the programming language. Although these same principles drive the design of SimioTM, the result is not a programming language, but a graphical modeling system.” In SimioTM, objects are created by instantiation. According to Sturrock and Pedgen (2010) instantiation occurs when the properties that govern the behavior of the object are specified. The authors in their research gave the following example: “the properties for a machine might include the setup, processing, and teardown time, along with a bill or materials and an operator required during the setup. The creator of the object decides on the number and the meaning of the properties. The properties in SimioTM are strongly typed and can represent numeric values, Booleans, strings, object references, dates and times, etc.” In SimioTM, objects are located in the standard library. Table 3 shows the objects that are presented in the standard library and a brief description of their function. 33PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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