Overview The demand for facial skin rejuvenation has seen recent, unprecedented growth. As people have become more aware about their cosmetic appearance, there has been a greater demand for newer technologies for treating aged and actinically damaged facial skin. Despite various methods available, the use of chemical peeling agents continues to be the gold standard. Chemical peeling is a proced...

Mesotherapy has received public interest for rejuvenation; however, there is inconsistent and inadequate evidence of its efficacy. As aesthetic physicians, we believe the lack efficacy rejuvenation may be due to insufficient injection depth. The standards have not been updated a long time, thus doing so will provide patients with better results.

In this paper, we discuss issues in performability modeling of \software rejuvenation," a form of software fault tolerance based on occasionally cleaning up the operational environment. System factors which play a key role in such a model are identi ed. Among these, we comment on two issues of particular interest when modeling software rejuvenation: (1) the representation of the degradation in ...