Josué Kuri

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—In this paper, we present algorithms that compute the routing and wavelength assignment (RWA) for scheduled lightpath demands in a wavelength-switching mesh network without wavelength conversion functionality. Scheduled lightpath demands are connection demands for which the setup and teardown times are known in advance. We formulate separately the routing(More)
—In this paper we investigate the problem of routing a set of lightpath demands for which the setup and tear-down dates are known. We call this type of requests Foreseeable Lightpath Demands or FLDs. In a transport network, FLDs correspond, for example , to clients' requests for pre-provisioned bandwidth capacity such as fixed-bandwidth pipes for bulk data(More)
We present a pattern matching approach to the problem of misuse detection in a computer system, which is formalized as the problem of multiple approximate pattern matching. This permits very fast searching of potential attacks. We study the probability of matching of the model and its relation to the ltering eeciency of potential attacks within large audit(More)
We present new search algorithms to detect the occurrences of any pattern from a given pattern set in a text, allowing in the occurrences a limited number of spurious text characters among those of the pattern. This is a common requirement in intrusion detection applications. Our algorithms exploit the ability to represent the search state of one or more(More)
— In this article we assess the economic gain obtained by introducing multi-granularity switching optical cross-connects (MG-OXCs) in an optical transport network. An MG-OXC is an equipment able to switch wavelengths, to aggregate (disag-gregate) wavelengths into (from) groups of wavelengths called wavebands and to switch wavebands. We evaluate the economic(More)
— Virtual concatenation (VCAT) is an SDH/SONET network functionality recently standardized by the ITU-T. VCAT provides the flexibility required to efficiently allocate network resources to Ethernet, Fiber Channel, ESCON and other important data traffic signals. The aim of this paper is to quantify the savings in network resources provided by VCAT, with(More)