Among the mobile ad hoc networks appealing characteristics there are network reconfigurability and flexibility. In this context a smart antenna capable of self-configuring multiple high-directivity beams provides a major advantage in terms of power saving, increased range, and spatial reuse of channels. In this paper a smart antenna made of a cylindrical array of patches suitable for MANETs is presented.
This extended abstract describes a poster and a proposal for demonstration. Its focus is on low rate wireless personal area networks (LR-WPANs) which use IEEE 802.15.4 physical and MAC layers at the lower layers of the protocol stack. More precisely, goal of this extended abstract is to present a real test-bed, whose main goal is to demonstrate how IEEE 802.15.4 LR-WPANs can fully inter-operate with IP networks. To this end, the protocol stack implemented at each IEEE 802.15.4 node includes the so said LoWPAN adaptation layer, which has been defined by the IETF 6LoWPAN working group. Moreover, we will present a possible practical solution for the problem of how to realize a gateway between the IEEE 802.15.4 LR-WPANs and the IP networks 1 .
Nuclear reactor simulation is often based on multi-group cross-section libraries. The structure and resolution of these libraries have a strong influence on the accuracy and computational time; hence, number of groups and energy structure must be carefully considered. The relationship between group structures and how they impact generated cross-sections can be a critical parameter. Common energy boundaries shared among major group structures were identified and the relative kinship among those was reconstructed in an effort to build a family tree of major group structures. Stochastic code Serpent2 [1] was employed to generate cross-sections of selected isotopes at different reactor compositions and conditions, using the investigated energy group structures. The impact on their generation was quantified by spectral weighted deviation. The 35 major energy structures were divided into three basic families. The key parameters distinguishing them were their applicability to thermal or fast reactors and their applicability in neutronic or multiphysics investigations. A sensitivity threshold of the generated cross-sections over the group structure resolution was investigated. The aim was to identify a group structure with very low dependency on the actual reactor spectrum.
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