Ludvig Knöös Franzén

Bio: Ludvig Knöös Franzén is an academic researcher from Linköping University. The author has contributed to research in topics: Computer science & System of systems. The author has an hindex of 2, co-authored 5 publications receiving 9 citations.

A Breakdown of System of Systems Needs Using Architecture Frameworks, Ontologies and Description Logic Reasoning

Abstract: Aerospace systems are connected with the operational environment and other systems in general. The focus in aerospace product development is consequently shifting from a singular system perspective to a System-of-Systems (SoS) perspective. This increasing complexity gives rise to new levels of uncertainty that must be understood and managed to produce aerospace solutions for an ever-changing future. This paper presents an approach to using architecture frameworks, and ontologies with description logic reasoning capabilities, to break down SoS needs into required capabilities and functions. The intention of this approach is to provide a consistent way of obtaining the functions to be realized in order to meet the overarching capabilities and needs of an SoS. The breakdown with an architecture framework results in an initial design space representation of functions to be performed. The captured knowledge is then represented in an ontology with description logic reasoning capabilities, which provides a more flexible way to expand and process the initial design space representation obtained from the architecture framework. The proposed approach is ultimately tested in a search and rescue case study, partly based on the operations of the Swedish Maritime Administration. The results show that it is possible to break down SoS needs in a consistent way and that ontology with description logic reasoning can be used to process the captured knowledge to both expand and reduce an available design space representation.

An Ontological Approach to System of Systems Engineering in Product Development

Abstract: This paper presents an approach to system-of-systems engineering for product development with the use of ontology. A proposed method for building as well as using ontology to generate and explore system-of-systems design spaces based on identified system-of-system needs is presented. The method is largely built to cover the first levels of related work, where a process for system of systems in the context of product development is introduced. Within this work, it is shown that scenarios for a system-of-systems can be used to identify needs and subsequently the system-of-systems capabilities that fulfils them. The allocation of capabilities to possible constituent systems is used to show the available design space. The proposed method of this paper therefore addresses these initial challenges and provides a framework for approaching the system-of-systems design space creation using ontology. A case study is used to test the method on a fictitious search and rescue scenario based on available resources and information from the Swedish Maritime Administration. The case study shows that a representation of a system-of-systems scenario can be created in an ontology using the method. The ontology provides a representation of the involved entities from the fictitious scenario and their existing relationships. Defined ontology classes containing conditions are used to represent the identified needs for the system-of-systems. The invocation of a description logic reasoner is subsequently used to classify and create an inferred ontology where the available system-of-systems solutions are represented as sub-classes and individuals of the defined classes representing the needs. Finally, several classes representing different possible system-of-systems needs are used to explore the available design space and to identify the most persistent solutions of the case study.

A Breakdown of System of Systems Needs Using Architecture Frameworks, Ontologies and Description Logic Reasoning

Abstract: Aerospace systems are connected with the operational environment and other systems in general. The focus in aerospace product development is consequently shifting from a singular system perspective to a System-of-Systems (SoS) perspective. This increasing complexity gives rise to new levels of uncertainty that must be understood and managed to produce aerospace solutions for an ever-changing future. This paper presents an approach to using architecture frameworks, and ontologies with description logic reasoning capabilities, to break down SoS needs into required capabilities and functions. The intention of this approach is to provide a consistent way of obtaining the functions to be realized in order to meet the overarching capabilities and needs of an SoS. The breakdown with an architecture framework results in an initial design space representation of functions to be performed. The captured knowledge is then represented in an ontology with description logic reasoning capabilities, which provides a more flexible way to expand and process the initial design space representation obtained from the architecture framework. The proposed approach is ultimately tested in a search and rescue case study, partly based on the operations of the Swedish Maritime Administration. The results show that it is possible to break down SoS needs in a consistent way and that ontology with description logic reasoning can be used to process the captured knowledge to both expand and reduce an available design space representation.

Demonstrating a semantic approach to clarifying regulatory ambiguity in aircraft design and development using process mapping, UML, and ontological modeling

Abstract: The design and development of an aircraft is a complex process, often taking place over 6-7 years, involving thousands of experts from many disciplines, and costing several billion dollars. Software tools have been developed to help manage this complexity, yet challenges remain with respect to their utility. Model-based approaches have been increasingly used to inform the development of software tools, in particular to facilitate an understanding between software developers and the domain experts for whom the software is being developed. Recent aircraft modeling research has identified challenges, such as interoperability, stemming from a lack of formal semantic structure. This paper discusses the current challenges faced in modeling literature, and proposes a formalized approach to semantic modeling of the aircraft design and development process. As certification is critical to aircraft design, the approach proposes using publicly available regulatory documentation to provide generic language and definitions, followed by an ontological model to develop a formal, aircraft domain-specific semantic structure prior to modeling for software-specific applications. Three modeling methods of process mapping, ontological modeling, and Unified Modeling Language (UML) are used to illustrate the advantages and limitations of a semantic approach to modeling. This paper uses the Advisory circular AC 21.101-1B Establishing the Certification Basis of Changed Aeronautical Products as a case study to illustrate the proposed approach. A formalized approach to modeling the aircraft design and development process contributes to structuring a model that adequately reflects the many entities and complex interactions that are implicit to this process. This paper concludes by identifying opportunities for further investigation of regulatory documentation to improve formal models of the aircraft design and development process.