Threshold signature

American Conference of Governmental Industrial Hygienists. 2005 TLVs and BEIs Based on the Documentation of the Threshold Limit Values for Chemical Substances and Physical Agents Biological Exposure Indices. Cincinnati, OH ACGIH Worldwide Signature Publications, 2005. 

The value applied to each mass is derived from the value of the associated residual. In a boolean framework, a threshold would be defined such that some values are declared as fault-free i.e., when the residual is lower than the threshold) and other ones as faulty i.e., when the residual is higher than the threshold). This method produces for each situation a vector of 0 and 1 that can be compared to the known signatures to isolate the fault. As already pointed out one main drawback is that if the value of the residual oscillates around the threshold, the state associated to the residual oscillates too. On the contrary, in the Evidence theory framework, an infinity of values are possible for each focal element. It is then possible to use smooth functions to produce a bba from the residual. For example, the following function has been proposed in [23] ... 

ACGIH (2008) Threshold Limit Values and Biological Exposure Indices. Signature Publications... 

A related question is whether there would be differences in reactivity between different tine structure states of 0( P) due to the accidental cancellation that causes state 1 to be largely dec oupled from state 4. TIk presenc.e or absence of this effect in 3D TSH calculations would be crucially dej)endence on the underlying basis set (adiabatic or diabatic) used. For exanijjle, this would not show up if the diabatie basis set that we used to set up our problem were used, but it should in an adiabatic basis. However, the signatures of this effect are subtle, as it mostly leads to a sujjjjression of reactivity in state 2 comjjared to state 1, but there is already suppression close to threshold due to the thicker barrier. 

A certain quorum of group members is needed to produce a signature. This may be a simple threshold or a more complicated rule, e.g., two directors, or one director and two vice-directors, or ninety-nine employees see, e.g., [Boyd86, Desm88, DeFr92, Lang95]. 

Lang95 Susan K. Langford Threshold DSS Signatures without a Trusted Party Crypto 95, LNCS 963, Springer-Verlag, Berlin 1995, 397-409. 

Isolation and contouring of all dark signatures, through appropriate threshold and segmentation processing of the image. 

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