Object-oriented Modeling Concepts Research Articles

Printing Information Modeling (PIM) for Additive Manufacturing of Concrete Structures

In the context of Industry 4.0, construction processes are shifting towards automation by implementing additive manufacturing (AM) of concrete structures, also referred to as concrete printing. Adapting concrete as a printing material entails complex material–process interactions between concrete and manufacturing processes that require specialized data modeling. However, data modeling for the AM of concrete structures has not kept up with concrete printing research and development. Aiming to enhance data modeling for the AM of concrete structures, this paper proposes a semantic modeling approach, referred to as “printing information modeling” (PIM). The PIM approach defines input parameters and material–process interaction in a generic printing information model for designing and planning concrete printing projects. Exchange requirements for concrete printing are identified and evaluated, serving as the basis for the printing information model. The printing information model, as a semantic (or meta) model, is conceptualized using object-oriented modeling concepts, formalized as an ontology, verified as an instantiable semantic model, and validated with a software tool developed as a plug-in for BIM platforms. As a result, a printing information model is developed to serve as a generally valid semantic model for the AM of concrete structures and has the potential to improve data modeling concepts currently deployed for concrete printing.

Perancangan Sistem Pengelolaan Engineering Order pada Lini Produksi

<p class="abstract">Production line is a place for production activities that consists series of workstations. The product moves from one workstation to the next in sequence to go through the stages of the process. Products are composed of components, sub-assemblies, or assemblies. During production activities, it is possible to change materials which are part of a product structure. This happened because of the proposal from the company staff which is submitted through an engineering order. Submissions are made for technical reasons or production costs. The decision to approve or reject the engineering order is determined by designer. The approved engineering order resulted in changes to the product structure and material requirements at the workstation where the material was changed. The process for handling new materials can also change depending on the designer's decision whether to use the old or new process. It is necessary to determine whether the old process is still used or not if designer decides to use a new process. Therefore, a system is needed to manage engineering orders so that changes can be updated automatically. The engineering order management system media is a web-based application. It is vital to model the system based on real-world situations before designing a web application. The object-oriented modeling concept, which is expressed in a class diagram, is used to model the system. Web development using the Python programming language and the Django framework has been carried out successfully. Every web feature has worked as expected.</p>

IEC 61970 standard based common information model extension of electricity-gas-heat integrated energy system

Power system, natural gas system, and thermal system are traditionally managed by different types of companies, resulting in information islands among different systems. In order to break the information islands phenomenon and realize the unified management of electric-gas-heat integrated energy system, this paper thoroughly analyses the composition and characteristics of the electricity-gas-heat integrated energy system and extends the common information model by using object-oriented modeling concept based on the IEC 61970 to meet the needs of integrated energy systems, such as multi-energy flow calculation, optimal scheduling, and operational control. The complete extended model of natural gas system, thermal system, coupling links and multi-energy storage systems is built. In addition, the attributes of key classes in the electricity-gas-heat integrated energy system are described, such as the classes of natural gas source, natural gas transporting unit, natural gas pipeline, natural gas load, motor-driven compressor, power-to-gas unit, power-to-heat unit, natural gas storage system, thermal storage system and hydrogen storage system. The extended common information model of electricity-gas-heat integrated energy system is built under the Rational Rose platform and an example verification is carried out to generate XML file and partial code of header file and source file in order to test the rationality of the extended common information model.

A proposal for extending UML-B to support a conceptual model

UML-B is a development process framework for Event-B based on a "UML-like" graphical formal notation that provides support for object-oriented modelling concepts, in particular, for class and state machine diagrams. However, this methodology has a gap for mapping requirements to formal specifications. To overcome this issue, we present a proposal for extending UML-B to support a conceptual model to provide an easier starting point for the actual development process. More precisely, we propose two diagrams to facilitate the passing from requirements to the initial formal model: a first one to represent system behavior based on UML 2 interaction overview diagram (IOD) and a second one for system structure based on boundary-control-entity stereotyped class diagram (BCE). We show how to translate the former into an Event-B specification and explain how to link the latter to the original UML-B using a simple ATM example as proof of concept.

A Semantic Comparison of Fusion and Syntropy

The Fusion and Syntropy object-oriented methods reflect some of the most rigorous object-oriented modelling concepts and experiences currently available. In this paper we identify similarities and differences between the two methods, and discuss how the best concepts from each of these methods can be combined to obtain clearer, more precise analysis models, specifications, and designs, and can be used to enhance the modelling power of the other. A summary of a semantics for Syntropy is given in Appendix A, and ways in which this can be extended to Fusion are described. This work was carried out as part of the EPSRC projects ‘Object-oriented Specification of Reactive and Real-time Systems’ concerning the extension of Fusion to treat reactive systems, and ‘Formal Underpinnings for Object Technology’ concerned with developing a full semantics for Syntropy.

Trigger inheritance and overriding in an active object database system

An active database is a database in which some operations are automatically executed when specified events happen and particular conditions are met. Several systems supporting active rules in an object oriented data model have been proposed. However, several issues related to the integration of triggers with object oriented modeling concepts have not been satisfactorily addressed. We discuss issues related to trigger inheritance and refinement in the context of the Chimera active object oriented data model. In particular, we introduce a semantics for an active object language that takes into account trigger inheritance and supports trigger overriding. Moreover, we state conditions on trigger overriding ensuring that trigger semantics is preserved in subclasses.

An object-centered approach for modelling engineering design products: Combining description logic and object-oriented modelling

AbstractClass-centered data models, such as the object-oriented data model, are inadequate for supporting engineering design product models because of their lack of support for object evolution, schema evolution, and semantic and user-defined relationships. Description logic overcomes these limitations by providing constructs for intentional description of classes, relationships, and objects. By combining description logic with object-oriented modelling concepts, design product schemas and data can be uniformly represented and modified throughout the design process.