Approximating DEX Utility Functions with Methods UTA and ACUTA
Matej Mihelcic, Marko Bohanec Ruer Boškovi Institute, Division of Electronics, Laboratory for Information Systems, Croatia, Jozef Stefan Institute, Department of Knowledge Technologies, Jamova 39, Ljubljana, Slovenia & Jozef Stefan International Postgraduate School, Jamova 39, Ljublj
Abstract: DEX is a qualitative multi-criteria decision analysis (MCDA) method, aimed at supporting decision makers in evaluating and choosing decision alternatives which has impact on security. We present results of a preliminary study in which we experimentally assessed the performance of two wellknown MCDA methods UTA and ACUTA to approximate
qualitative DEX utility functions with piecewise-linear marginal utility functions. This is seen as a way to improve the sensitivity of qualitative models and provide a better insight in DEX utility functions. The results indicate that the approach
is in principle feasible, but at this stage suffers from problems of convergence, insufficient sensitivity and inappropriate handling of symmetric functions
Keywords: Security, Multi-criterial Decision Analysis Approximating DEX Utility Functions with Methods UTA and ACUTA
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Figure 6. ACUTA results for DEX function YW
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