W hen the Internet Engineering Task Force approved Internet protocol version 6 several years ago, proponents acclaimed it as a major development. Since then, IPv6 (see the sidebar " IPv6 Primer ") has received support only in some areas. In Asia, for example, the profusion of smart cellular phones and PDAs has caused the demand for IP addresses to outstrip the limited supply provided by IPv4, t...

This paper considers solving optimization problem for linear discrete time systems such that closed-loop discrete-time system is positive (i.e., all of its state variables have non-negative values) and also finite-time stable. For this purpose, by considering a quadratic cost function, an optimal controller is designed such that in addition to minimizing the cost function, the positivity proper...