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Thesis abstracts

This section presents the abstract of most recent Master or PhD thesis related to aerospace technology and management

ELICERE: The elicitation process for dependability goals in critical computer systems – A case study for space application

Variability management in software product lines using adaptive object and reflection

Carlos Henrique Netto Lahoz Institute of Aeronautics and Space lahoz@iae.cta.br

PhD Thesis in Electric Engineering at the Polytechnic School of the University of São Paulo, São Paulo, São Paulo State, Brazil, 2009.

Luciana Akemi Burgareli Institute of Aeronautics and Space luciana@iae.cta.br

PhD Thesis in Electric Engineering at the Polytechnic School of the University of São Paulo, São Paulo, São Paulo State, Brazil, 2009.

Advisor: Prof. Dr. João Batista Camargo Júnior

Advisors: Dr. Selma Shin Shimizu Melnikoff and Dr. Mauricio Gonçalves Vieira Ferreira

Keywords: Dependability, Goals, Elicitation, Critical computer systems, Space project.

Keywords: Software product line, Variability, Adaptive object model, Reflection, Brazilian Satellites Launcher

Abstract: The technological advances in electronic and software have been rapidly assimilated by computer systems, demanding new approaches for software and systems engineering to provide reliable products, under well-known quality criteria. In this context, requirements engineering has a strategic role in project development. Problems in the elicitation activity contribute to producing poor, inadequate or even non-existent requirements that can cause mission losses, material or financial disasters, premature project termination or promote an organizational crisis. This thesis introduces the elicitation process for dependability goals, called ELICERE, applied to critical computer systems based on a goal-oriented requirement engineering technique, called i*, and the safety engineering techniques HAZOP and FMEA, which will be applied for the identification and analysis of operational risks of a system. After creating the system models using i* diagrams, they are analyzed through guidewords based on HAZOP and FMEA, from which goals related to dependability are extracted. Through this interdisciplinary approach, ELICERE promotes the identification of goals that meet the quality requirements, related to dependability for critical systems, still in the project conception phase. The case study approach is based on a qualitative and descriptive single-case, using a computer system project of a hypothetical launching rocket, called V-ALFA. The ELICERE application in this space project intends to improve the requirement engineering activities in the computer system of the Brazilian Satellite Launch Vehicle, and also a way to explain how the ELICERE process works.

Abstract: The Software Product Line approach offers benefits such as savings, large-scale productivity and increased product quality to the software development because it is based on software architecture reuse, which is more planned and aimed to a specific domain. Variability management is a key and challenging issue, since this activity helps identifying, designing and implementing new products derived from a software product line. This work defines a process for the variability management of a software product line. After modeling the variability, extracting the variants from use case diagrams and features, the next step is to specify the variability that was identified. Finally, the proposed process uses a variability mechanism based on adaptive object model and reflection as support in the creation of variants. The proposed process uses as case study the software system of a hypothetic space vehicle, the Brazilian Satellites Launcher.

Complex permittivity and permeability behaviors, 2-18GHz, of RAM based on carbonyl iron and MnZn ferrite

Adriana Medeiros Gama Institute of Aeronautics and Space adriana.gama@iae.cta.br

Journal of Aerospace Technology and Management

V. 1, n. 2, Jul. - Dec. 2009


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