Computer aided design and computer aided modeling tools are becoming increasingly important in the design and performance evaluation of communication systems. In this work, we report on the computer simulation modeling study of terrestrial digital microwave radio transmission, using Block Oriented System Simulator package (BOSS). The work concentrates on semi-analytical error rate evaluation in...

The object-oriented approach has evolved as a software design and programming method. It was later adapted to systems analysis as a modeling method. Modeling in systems analysis is used to create a representation of the organizational domain for which the information system is developed. Such a model is termed an enterprise model. A modeling method comprises a modeling technique and a modeling ...

In spite of the widely recognized benefits of applying Service Oriented Architecture (SOA) to design enterprise-scale software systems, its actual application practice is not always a success. One major reason is the lack of a systematic engineering process and tool supported by reusable architectural artifacts. Toward this ultimate goal, this paper proposes a new method of architectural buildi...

Service Oriented Architectures are increasingly being used to achieve interoperability among heterogeneous systems. SOAs help developers to integrate different architectures in order to reuse legacy systems and extend software boundaries. Semantics could improve SOA features adding a common understanding of the resources shared among different systems. Model Driven Development could be useful t...

We present aggregate contribution as a solution for two longstanding issues with goal modeling languages such as i* and GRL which support decomposition and contribution links for intentional elements. An aggregate contribution summarizes the contributions of constituent parts (child elements) at the parent level, giving the modeler an overview of the actual impact of the parent while still enab...

Very well known problems such as the fragility problem, the AOP paradox, or the aspect interference problem threaten aspect oriented application in the modeling phase. In this work we explore FVS, a declarative visual language, as an aspect-oriented modeling language. Our language exhibits a very flexible and rich joinpoint model to leverage aspect-oriented application and is suitable for incre...

Management and control over the processes occurring in transport system can be carried out at macroscopic level based on operations research methods or microscopic using simulation theory. The article analyzes characteristics of presents a concept that is suitable for both types models. description structure given three main components: infrastructure allows you to determine routes movement veh...