The quantitative correlation between them, which is quite different from the qualitative "comfortable" or "uncomfortable" results attained by objective evaluation, can be defined by function and regarded as a basis to scientifically evaluate and improve the ride comfort.
The fitness evaluation can be defined as: ν ~ = max 0, ν i l ~ − ν i l, (6).
Evaluation can be defined as the systematic determination of the quality, value or importance of, for example, programs, projects or institutions [ 1].
Team performance evaluation can be defined as, "the application of standard diagnostic measurement tools to assess the behaviors, cognitions and attitudes enacted by team members in relation to clearly operationalized criteria" [ 15].
Once the specific competencies are identified, and this exercise has to be location-specific, then the training objectives, the curriculum content and the evaluation methods can be defined.
In this paper the signal-to-noise ratio, γ, plays a major role in channel characterization and performance evaluation and it can be defined from the signal model: r t = hs t + n t, (1).
The data categories in this study that are relevant to supplier evaluation and selection can be defined as quantitative criteria (cost of the material and delivery lead time) and qualitative criteria (quality of the supplied materials, warranty given on the material by the supplier and production capacity of the suppliers).
Finally, based on the definitions of specificity (S p ) and sensitivity (S n ), a comprehensive evaluation indicator F-score can be defined as follows: (7) F -score = 2 × S p × S n S p + S n.
Evaluation, on the other hand, can be defined as the " judgement of interventions according to their results, impacts and needs they aim to satisfy" (OECD 2002) [ 5].
Nevertheless, even if such likelihood model can be defined, its evaluation may be very computationally inefficient.
This model assumes n decision-making units (DMUs), with m inputs and p outputs, where the efficiency evaluation model of k th DMU can be defined as in the following equation (1) [8]: Max f k = ∑ r = 1 p u r y r k ∑ i = 1 m v i x i k, s.t. f k = ∑ r = 1 p u r y r k ∑ i = 1 m v i x i k ≤ 1, l = 1, 2, …, n, u r ≥ ε, r = 1, 2, …, p, v i ≥ ε, i = 1, 2, …, m, (1).
