In this regard, the concepts of efficient and weak efficient solutions are widely used.
We show that for this more general domain, there exists no extension of PS that is ex post efficient and weak strategyproof.
For example, the evaluated DMU (S _{1}) is superefficient in Figure 2(a), the evaluated DMUs (E _{1}) and (E _{2}) are efficient and weak efficient, respectively, in Figure 2(b), and the evaluated DMU E is inefficient in Figure 2(c).
In the CCR model, the constraint condition consists of all the DMUs, and the production frontier is spanned by efficient DMUs and weak efficient DMUs.
Furthermore, the targeting of HepaRG hepatoma cells with NPs bearing cyclic RGD was very efficient and much weaker for HeLa and HT29 cell lines confirming that cyclic RGD is a suitable targeting agent for liver cells.
Among others, recurrent drought, erratic rainfall, pests, land tenure insecurity, population pressure, soil erosion, overgrazing, deforestation, lack of efficient rural organizations and weak institutional support are often cited (Beshah 2003).
Concerns that Fretilin, a formerly Marxist party, would cause trouble in government have been largely allayed.There are worries about whether the new police force and the army will be efficient, and whether the weak legal system will prove resistant to bribery.
Interestingly, the overexpression of all the S. cerevisiae Leloir genes in Y. lipolytica was not efficient and resulted in weak, delayed growth (Additional file 2A).
If the evaluated DMU is DEA superefficient by the (t _{1} th standard and weak efficient by the (t _{2} th standard, then Stop - the evaluated DMU has similar behavior with the ((t _{2}-1))th standard.
While these interactions are substantially less efficient, and thus likely weaker than others presented here, and may thus represent artifacts, they are nevertheless observed reproducibly, and intriguing for three reasons.
They might be helping the brain get more efficient at responding to small and weak visual signals.
