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A simulation-based algorithm for the Permutation Flowshop Sequencing Problem (PFSP) is presented. The algorithm uses Monte Carlo Simulation and a discrete version of the triangular distribution to incorporate a randomness criterion in the classical Nawaz, Enscore, and Ham (NEH) heuristic and starts an iterative process in order to obtain a set of(More)
The increasing heterogeneity and complexity of the Information Technology infrastructure encompassing hardware and software applications, services and networks, led to complex, unmanageable and insecure systems. Correspondingly, new approaches in regards to the IT infrastructure automation and operation have been investigated. Autonomic computing has been(More)
Image formats specified by the joint photographic expert group (JPEG) are preferred for images with high colour content. Along with graphic interchange format (GIF) images, JPEG is the most commonly used image format on the Internet and JPEG is the de facto still image format for digital cameras. All major digital camera manufacturers use JPEG as its(More)
Discrete event systems have been researched for quite a while in the domain literature. A series of modelling and analysis techniques have been used. Sequential automata models are at the basis of their studies and theories have been born to provide tools for their design. Automatic transport systems with accumulation areas are a particular type of systems(More)
Explaining the (mis)behavior of virtual machines in large-scale cloud environments presents a number of challenges with respect to both scale and making sense of torrents of datacenter telemetry emanating from multiple levels of the stack. In this paper we leverage VM-similarity to explain the behavior or performance of a VM using its cohort as a reference(More)
Large-scale distributed systems, such as Overnet, BOINC (SETI@home) or PlanetLab, provide attractive options through aggregation and sharing of heterogeneous and geographically dispersed computer resources. However, in order to be efficient, these systems need to consider some issues related to the Reliability and Availability (R&A) levels of their(More)
A network management environment with dynamic behaviour can be used as a base for developing a wide range of applications from active networks to "on the fly" customised network management interfaces. This paper presents the dynamic features of the "BaseLayer", a network management tool developed by Machine Intelligence Research Laboratory, University of(More)
This paper presents a chat application that uses CORBA Event and Naming services for communication between users and Microsoft text-to-speech engines to speak the messages. Users can choose the computer voice, which will represent them during the chat, by selecting the gender, speed and pitch of the text-to-speech engine. After connecting to a server, users(More)
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