Posterior intensity method

GC-0 methods are commonly class ed in four categories dilution, time intensity, detection frequency, and posterior intensity methods. Dilution analysis, the most applied method, is based on successive dilutions of an aroma extract until no odor is perceived by the panelists. This procedure, usually performed by a reduced number of assessors, is mainly represented by combined hedonic aroma response method (CHARM) [67], developed by Acree et al., and aroma extraction dilution analysis (AEDA), rst presented by Ullrich and Grosch [68]. The former method has been applied to the investigation of two sweet orange oils from different varieties, one Florida Valencia... 

Another GC-0 technique, the posterior intensity method [77], proposes the measurement of a compound odor intensity and its posterior scoring on a previously determined scale. This posterior registration of the perceived intensity may cause a considerable variance between assessors. 

The choice of the GC-0 method is of extreme importance for the correct characterization of a matrix, since the application of different methods to an identical real sample can distinctly select and rank the odor-active compounds according to their odor potency and/or intensity. Commonly, detection frequency and posterior intensity methods result in similar odor intensity/concentration relationships, while dilution analysis investigate and attribute odor potencies. 

Another GC-O technique, the posterior intensity method [77], proposes the measurement of a compound odor intensity, and its posterior scoring on a previously determined scale. This posterior registration of the perceived intensity may cause a considerable variance between assessors. The attained results may generally be well correlated with detection frequency method results, and to a lesser extent, with dilution methods. In the above-mentioned research performed on the essential oils of Brazilian rosewood, this method was also used to give complementary information on the intensity of the linalool enantiomers [76]. 

Pet ka, J., Ferreira, V, and Cacho, J. (2005). Posterior evaluation of odour intensity in gas chromatography-olfactometry comparison of methods for calculation of panel intensity and their consequences. Flavour Frag. J., 20, 278-287. 

Gull 1989) addresses these problems classical or quantified MaxEnt (in contrast to the previously described method, now dubbed historical ). It has been implemented in the MEMSYS5 package. Imaging is treated as a Bayesian parameter estimation problem for the pixel intensities. The prior probability has the form P(f) a ), the posterior probability for data D is given by P(f ) oc with the notation of Section 3. a is... 

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