Anthony Holohan

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We develop an approximate analytic model of an Optical Burst Switch with share-per-node fibre delay lines and tuneable wavelength converters by employing Equivalent Random Theory, an approach from circuit-switching analysis. Our model is formulated in terms of virtual traffic flows within the switch from which we derive expressions for burst blocking(More)
—In this paper we propose an analytic framework for estimating blocking probability in an asynchronous optical burst switch with wavelength conversion and a multi-channel feedback fibre delay line. Burst arrivals are of general renewal type and burst lengths exponentially distributed. Example solutions for gamma-distributed arrivals are compared with(More)
This paper studies certain inverse problems in the optimal frequency-domain synthesis of robust controllers, in both the 2-norm and the infinity-norm. These inverse problems identify the class of controllers which are optimal for some choice of weights. Their implications for loopshaping are discussed. E c.t/ g − + E K.s/ E u.t/ G 0 .s/ E g c d.t/ E y.t/ '(More)
This paper studies certain inverse problems in the optimal frequency-domain synthesis of robust controllers, in both the 2-norm and the infinity-norm. These inverse problems identify the class of controllers which are optimal for some choice of weights. Their implications for loopshaping are discussed.
  • A M Holohan
  • 1986
During the nineteenth century the inhabitants of the remote island of St Kilda persisted in their belief that they were susceptible to disease if exposed to infection brought by visitors; these ideas were the source of much ridicule. The emigration of thirty-six islanders to Australia in 1852 resulted in excessive mortality during the voyage compared with(More)
In the nineteenth century in the island of St Kilda, faced with maternal mortality which reached 107.1 and excessive neonatal mortality, women went to Obe, now Leverburgh, in the island of Harris in the Outer Hebrides to be confined, often marooned there for many months due to treacherous seas. Using family reconstruction techniques the reproductive history(More)
This paper shows that, in the SISO case, optimal mixed-sensitivity 2-norm controllers are also solutions to the optimal robust disturbance attenuation problem (ORDAP). That is, they deliver robust sensitivity reduction despite unstructured uncertainty at the optimal level. We explicitely identify one set of ORDAP weights for which such a controller is ORDAP(More)
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