Young Hee Kim

In this work, the reliability of HfO2 (hafnium oxide) with poly gate and dual metal gate electrode (Ru–Ta alloy, Ru) was investigated. Hard breakdown and soft breakdown, particularly the Weibull slopes, were studied under constant voltage stress. Dynamic stressing has also been used. It was found that the combination of trapping and detrapping contributed to the enhancement of the projected lifetime. The results from the polarity dependence studies showed that the substrate injection exhibited a shorter projected lifetime and worse soft breakdown behavior, compared to the gate injection. The origin of soft breakdown (first breakdown) was studied and the results suggested that the soft breakdown may be due to one layer breakdown in the bilayer structure (HfO2/SiO2: 4 nm/4 nm). Low Weibull slope was in part attributed to the lower barrier height of HfO2 at the interface layer. Interface layer optimization was conducted in terms of mobility, swing, and short channel effect using deep submicron MOSFET devices.

A network architecture, named NARA, based on recursive addressing is proposed. The Internet is modeled as a network of autonomous sites, each being a collection of nodes. Each site is named by a site address drawn from a global number space while each node is named by a node address drawn from a number space local to each site. Routing among sites depends solely on site addresses while that among nodes within each site on node addresses. Flat routing to render inherent mobility and cached routing as well as virtual routing to additionally cope with the table size are proposed. The model can recursively repeat itself both outwards and inwards in the network, enabling its applicability, for example, to inter-planetary as well as body area networks. The generic architecture NARA is then projected on IPv6 as an implementation example. Instead of introducing a new number space to unload the equivocal semantics of the IP address, the specific implementation, called SID6 (Subnet ID Deprecated for IPv6), removes the interface semantics of the Global Unicast IPv6 address which is then to exclusively identify a node and so is to be used solely as the node address.