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Infoscience - École polytechnique fédérale de Lausanne
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35065 Publications
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  • On Multi-scale Fourier Transform Analysis of Speech Signals

    Tyagi, Vivek; Bourlard, Hervé (2003)
    In this paper, we introduce a novel algorithm to perform multi-scale Fourier transform analysis of piecewise stationary signals with application to automatic speech recognition. Such signals are composed of quasi-stationary segments of variable lengths. Therefore, in the proposed algorithm, signals are analyzed with multiple-sized windows. Resulting power spectra are then normalized such that they all have unit energy, followed by entropy computation of each power spectrum. These entropies ar...

    Blocking parameterizations for improving the computational tractability of affine disturbance feedback MPC problems

    Oldewurtel, Frauke; Gondhalekar, Ravi; Jones, Colin; Morari, Manfred (2009)
    Many model predictive control (MPC) schemes suffer from high computational complexity. Especially robust MPC schemes, which explicitly account for the effects of disturbances, can result in computationally intractable problems. So-called move-blocking is an effective method of reducing the computational complexity of MPC problems. Unfortunately move-blocking precludes the use of terminal constraints as a means of enforcing strong feasibility of MPC problems. Thus move-blocking MPC has traditi...

    Silane plasma diagnostics for high-efficiency silicon heterojunction solar cells

    Descoeudres, Antoine; Bartlome, Richard; Choong, Grégory; De Wolf, Stefaan; Barraud, Loris; Bôle Rothen, Priscille; Zicarelli Fernandez, Fernando; Ballif, Christophe (2011)
    In silicon heterojunction solar cells, the passivation of the crystalline silicon wafer surfaces and fabrication of emitter and back surface field are all performed by intrinsic and doped amorphous silicon thin layers, usually deposited by plasma-enhanced chemical vapor deposition (PECVD). By using in-situ diagnostics during PECVD, it is found that the passivation quality of such layers directly relate to the plasma conditions, especially on the silane depletion fraction. Good interface passi...

    How to Safely Close a Discussion

    Avoine, Gildas; Vaudenay, Serge (2007)
    In the secure communication problem, we focus on safe termination. In applications such as electronic transactions, we want each party to be ensured that both sides agree on the same state: success or failure. This problem is equivalent to the well known coordinated attack problem. Solutions exist. They however concentrate on the probability of disagreement, and attack incentives have been overlooked so far. Furthermore, they focus on a notion of round and are not optimal in terms of communic...

    Montgomery Multiplication on the Cell

    Bos, Joppe Willem; Kaihara, Marcelo E. (2010)
    A technique to speed up Montgomery multiplication targeted at the Synergistic Processor Elements (SPE) of the Cell Broadband Engine is proposed. The technique consists of splitting a number into four consecutive parts. These parts are placed one by one in each of the four element positions of a vector, representing columns in a 4-SIMD organization. This representation enables arithmetic to be performed in a 4-SIMD fashion. An implementation of the Montgomery multiplication using this techniqu...
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