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Abstract
The subsystem components of a net-centric system are developed from hard core engineering disciplines; however, there is a need to architect large net-centric systems from a Systems Engineering view point. The complexity inherent in network-centric systems arises not only from the number of components, but also from the diversity and real-time data exchanges required. Architecting such a system could be challenging because of the existence of several architecting frameworks. DoDAF has become the "de facto" standard for Systems Architecting. This paper briefly discusses TOGAF and DoDAF, and compares the two, in modeling a net-centric architecture. Future work is also mentioned.
Keywords
Some keywords used in this paper include: Net-centric system, Network-centric system, Net-centricity, Network Enabled Capability, TOGAF, DoDAF, architecture framework, availability, Operational View, Systems View, Technical View, Enterprise Framework.
1. Introduction
Architecture is the art of designing the human built environment. It is an interdisciplinary field, which draws on mathematics, science, art, technology, social sciences, politics, history, and philosophy [10]. "Architecture is a science, arising out of many other sciences, and adorned with much and varied learning: by the help of which a judgment is formed of those works which are the result of other arts." (Marcus V. Pollio, died ca. 25 BC)
Systems architecting is defined as the art and science of developing systems solutions by making use of systems engineering specialties to develop satisfactory and feasible systems concepts-and certification for client use in illstructured problem environments[8]. Systems architecting is an approach that goes beyond mathematical analysis and optimization of systems. A Systems approach focuses on the system as a whole when deciding what is required and what is feasible [11] [13].
Network-centric system or network-enabled capability is a term that describes the connectivity between various subsystems made possible by advances in information technology and telecommunications. It describes the integration of sensors, decision-makers, effectors and support capabilities to achieve a more flexible and responsive system. Because the concept originated from the military, most definition refers to military operations, however it can be extended to emergency responses and other commercial purposes [12].Network Enabled Capability (NEC) is a long-term change programme that will take awhile to materialize into an improved approach to military operations, emergency response and various other uses [12].
2. Network-Centric Systems