id: 05007208
dt: j
an: 05007208
au: de Korvin, André; Sirisaengtaksin, Ongard; Hashemi, Shohreh
ti: A body of evidence approach under partially specified environments.
so: Neural Parallel Sci. Comput. 13, No. 1, 91-106 (2005).
py: 2005
pu: Dynamic Publishers, Atlanta, GA
la: EN
cc: 
ut: type-2 fuzzy sets
ci: 
li: 
ab: Summary: The main objective of this work is to implement the concept of
    body of evidence and type-2 fuzzy sets to develop methodologies in
    making decisions with risk levels under partially specified
    environments. We illustrated our approaches using speeds and safety
    levels under partially specified environments where each environment is
    a complex aggregation of road condition, atmosphere condition, density
    and speed of traffic and perhaps other factors. We defined a concept of
    safety level or risk level, and determined the safety level of a new
    environment represented as a fuzzy subset of the set of known
    environments. To obtain a standard range of appropriate speeds for new
    environments with a set of similar known environments, we defined
    speeds as type-2 fuzzy intervals and performed a defuzzification. We
    then generalized the set of environments by assuming that the known
    environments in the set are dissimilar where each environment has a set
    of reasonable speeds with belief intervals. In this case the safety
    level of a new environment can be defined by applying $α$-cuts. We
    also extended our results to the case where each known environment in
    the set has fuzzy level of safety. Furthermore, using a modified mass
    composition operator, we formulated the uncertainty surrounding
    intervals in the speed space for a direct association between safety
    levels and appropriate speed intervals.
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