Object-oriented Modeling Principles Research Articles

Функціональна організація системи підтримки прийняття рішень організаційного управління

The paper is devoted to the implementation of an approach to designing anobject-oriented decision support system for automating organizational management processes. The structure of such a system is based on the problem-independent components of the presentation of the subject area of the organizational and technical system, on the basis of which the decision maker implements the functional tasks of organizational management. On the basis of the principles of object-oriented modeling, sets of information classes of objects of the vocabulary of a subject domain are selected, which make it possible to construct an object information model of a specific subject area of an ADSS application object. The information technology platform for the creation of the ADSS is considered, which requires such an organizational and functional structure of the software environment in which the objects of the subject area and the relationships between them are determined independently of the implementation of functional tasks of data processing in the procedures and interfaces of the system, and represent a single structure. As a result, afunctional ADSS organization was proposed in the form of a unified informationenvironment for constructing a computer organizational management system that implements monitoring of production indicators of organizational and technical system entities, in particular, the electricity market.Ref. 15, pic. 2

Open-source energy planning tool with easy-to-parameterize components for the conception of polygeneration systems

Polygeneration systems are a key technology for the reduction of primary energy usage and emissions. High costs, lack of flexibility and effort for parameterization hinder the wide usage of modeling tools during their conceptual design. This paper describes how planning tools can be structured for the conceptual design phase where only little information is available to the planner. A library concept was developed using the principles of object-oriented modeling to address the flexibility issue. With respect to cost and expandability, the open-source modeling language Modelica was chosen. Furthermore, easy-to-parameterize component models were developed. In addition to the improved library concept and novel component models, an easy-to-adapt control concept is proposed. The component models were validated and the applicability of the library was demonstrated by means of an example. It was shown that the data usually obtained from spec sheets are sufficient to parameterize the models. In addition to this, the control concept was approved.

An equation-based algorithmic differentiation technique for differential algebraic equations

This work presents a novel Algorithmic Differentiation (AD) approach for sensitivity analysis of Differential Algebraic Equation systems (DAEs). For the first time, the algorithmic specification of a computationally memory-efficient equation-based AD technique is presented. This approach is mainly targeting equation-based modeling and simulation tools capable of constructing high-level models using state of the art object-oriented modeling principles. The approach is based on fundamental tree algorithms that are (even manually) applicable on implicit equation systems of long formulas, the main building blocks of model components. By applying the presented forward differentiation scheme on a given DAE, efficient representation of Sensitivity Equation Systems (SESs) is computed. Parameter sensitivities are evaluated by direct integration of the derived SESs. To overcome the runtime performance drawback of direct numerical integration, a system decomposition approach is recommended. It is shown that the runtime performance using modern variable-step integration methods tends to achieve the expected theoretical complexity of the forward differentiation scheme under few realistic assumptions.

Representing group technology classification and coding techniques with object oriented modeling principles

The purpose of this paper is to show the common basis of several object-oriented design modeling principles as compared with those used in classification and coding (C&C) for group technology applications. Five types of decision tree (E-trees, N-trees, X-trees, D-trees, and C-trees) are shown to be in exact correspondence with the object-oriented modeling principles generalization with disjoint subclasses, generalization with overlapping subclasses, classification, generalization with restriction, and aggregation, respectively. In addition, C&C modeling and subsequent database implementation are shown to be enhanced through application of such object-oriented modeling principles as association and role names. Finally, a case study is presented that illustrates the application of these principles in the design and implementation of a C&C system for abrasive flow machining.

System management information modeling

An overview of Open Systems Interconnection (OSI) modeling principles and concepts as contained in the systems management information model is presented. Object-oriented modeling principles as applied to OSI systems management are reviewed. The notions of inheritance, compatibility, and allomorphism are included. There is a description of how managed objects (MOs) are named. A reference to notational tools for OSI management is provided. >