منابع مشابه
Island Hopping and Path Colouring
Two benefits of optical communication are (a) the possibility of using a single fiber optic cable to carry multiple signals simultaneously if each signal uses light of a distinct wavelength, and (b) the decreased latency for signals that avoid expensive optical-electric-optical (OEO) conversions. This paper studies two natural graph problems that arise when trying to capitalize on these benefit...
متن کاملIsland hopping introduces Polynesian field crickets to novel environments, genetic bottlenecks and rapid evolution.
Teleogryllus oceanicus, a cricket native to Australia, was introduced to Hawaii where it encounters a novel natural enemy responsible for their recent rapid evolutionary loss of singing ability. To explore how genetic diversity varies across their broad range, their mode of introduction to Hawaii and nonadaptive influences on the sexual signalling system, we assessed variation at seven microsat...
متن کاملControl of Hopping Height for a One-Legged Hopping Machine
The control of the hopping height in a one-legged machine is studied. The general aim is to decrease sensitivity of the hopping height to drifts in the machine’s parameters. The proposed approach combines a near-inverse controller which uses height feedback, with a recursive least-squares parameter estimator which continually tunes the controller. The paper presents the mechanical design of the...
متن کاملTime hopping and frequency hopping in ultrawideband systems
This paper analyzes frequency-hopping (FH) and time-hopping (TH) as multiple access format for ultrawideband communications. We apply the concept of fourthegy, recently introduced by Subramanian and Hajek, to both TH and FH.We find that the design rules are different for FCCcompliant systems(where the power spectral density is limited)than for conventional systems(where the energy per bit is li...
متن کاملIsland hopping across the central Pacific: mitochondrial DNA detects sequential colonization of the Austral Islands by crab spiders (Araneae: Thomisidae)
Aim Phylogenetic studies concerning island biogeography have been concentrated in a fraction of the numerous hot-spot archipelagos contained within the Pacific Ocean. In this study we investigate relationships among island populations of the thomisid spiderMisumenops rapaensis Berland, 1934 across the Austral Islands, a remote and rarely examined southern Pacific hot-spot archipelago. We also a...
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ژورنال
عنوان ژورنال: Nature Nanotechnology
سال: 2008
ISSN: 1748-3387,1748-3395
DOI: 10.1038/nnano.2007.434