High-frequency averaging in semi-classical Hartree-type equations

We investigate the asymptotic behavior of solutions to semi-classical Schroedinger equations with nonlinearities of Hartree type. For a weakly nonlinear scaling, we show the validity of an asymptotic superposition principle for slowly modulated highly oscillatory pulses. The result is based on a high-frequency averaging effect due to the nonlocal nature of the Hartree potential, which inhibits the creation of new resonant waves. In the proof we make use of the framework of Wiener algebras.Comment: 13 pages; Version 2: Added Remark 2.

Interaction of modulated pulses in the nonlinear Schroedinger equation with periodic potential

We consider a cubic nonlinear Schroedinger equation with periodic potential. In a semiclassical scaling the nonlinear interaction of modulated pulses concentrated in one or several Bloch bands is studied. The notion of closed mode systems is introduced which allows for the rigorous derivation of a finite system of amplitude equations describing the macroscopic dynamics of these pulses

Recognition of Harmonic Sounds in Polyphonic Audio using a Missing Feature Approach: Extended Report

A method based on local spectral features and missing feature techniques is proposed for the recognition of harmonic sounds in mixture signals. A mask estimation algorithm is proposed for identifying spectral regions that contain reliable information for each sound source and then bounded marginalization is employed to treat the feature vector elements that are determined as unreliable. The proposed method is tested on musical instrument sounds due to the extensive availability of data but it can be applied on other sounds (i.e. animal sounds, environmental sounds), whenever these are harmonic. In simulations the proposed method clearly outperformed a baseline method for mixture signals

Acoustic Scene Classification

This work was supported by the Centre for Digital Music Platform (grant EP/K009559/1) and a Leadership Fellowship (EP/G007144/1) both from the United Kingdom Engineering and Physical Sciences Research Council

Over-the-air software updates in the internet of things : an overview of key principles

Due to the fast pace at which IoT is evolving, there is an increasing need to support over-theair software updates for security updates, bug fixes, and software extensions. To this end, multiple over-the-air techniques have been proposed, each covering a specific aspect of the update process, such as (partial) code updates, data dissemination, and security. However, each technique introduces overhead, especially in terms of energy consumption, thereby impacting the operational lifetime of the battery constrained devices. Until now, a comprehensive overview describing the different update steps and quantifying the impact of each step is missing in the scientific literature, making it hard to assess the overall feasibility of an over-the-air update. To remedy this, our article analyzes which parts of an IoT operating system are most updated after device deployment, proposes a step-by-step approach to integrate software updates in IoT solutions, and quantifies the energy cost of each of the involved steps. The results show that besides the obvious dissemination cost, other phases such as security also introduce a significant overhead. For instance, a typical firmware update requires 135.026 mJ, of which the main portions are data dissemination (63.11 percent) and encryption (5.29 percent). However, when modular updates are used instead, the energy cost (e.g., for a MAC update) is reduced to 26.743 mJ (48.69 percent for data dissemination and 26.47 percent for encryption)

Organizational aspects of ICT applications in cultural heritage “Virtual Museum” context: the permanent challenge of reconciliation of diverging scientific, technical, operational and financial objectives

[EN] The applications of ICT in the cultural heritage field are including a new expanding category of applications, having a “creative” character, and a multidisciplinary approach. Motivations and priorities of involved players (individuals and organizational players), are presented, through various FHW paradigm projects, in order to explore the possible impact of this kind of projects in science and cultural heritage concept, as well as to explore their hidden added value, that makes them capable to attract resources.[ES] Las aplicaciones de las Tecnologías de la Información y la Comunicación en el patrimonio cultural comprenden una nueva categoria de acciones, con un caracter creativo, y un concepto multidisciplinario. Este trabajo sirve para presentar las motivaciones y prioridades de los actores involucrados (individuos o instituciones), que participan en estos proyectos, para examinar en base a estos las posibles consecuencias de estos proyectos en el concepto mismo de ciencia y patrimonio cultural, al mismo tiempo que se explora también su oculto valor añadido, valor este que les puede permitir atraer nuevos recursos.Giannoulis-Giannoulopoulos, G. (2012). Organizational aspects of ICT applications in cultural heritage “Virtual Museum” context: the permanent challenge of reconciliation of diverging scientific, technical, operational and financial objectives. Virtual Archaeology Review. 3(7):8-13. https://doi.org/10.4995/var.2012.4370OJS81337ECONOMOU, M. & PUJOL TOST, L. (2007): "Evaluating the impact of new technologies on cultural heritage visitors", in J. MacLoughin, K. Kaminski, B Sodagar (eds). Technology strategy, management and socio-economic impact, heritage management series, vol. 2, Budapest, Archaeolingua.FHW (2007): Ancient Agora, Visual reconstruction of the ancient Agora of Athens. http://project.athens-agora.gr/FHW (2007): THOLOS the dome shaped theater of FHW. http://tholos254.grFOUCAULT, Michel (1969): L'Archeologie du savoir. Paris, Gallimard.PLANTZOS, D. & DAMASKOS, D. (eds.) (2008): "A Singular Antiquity", MOUSEIO BENAKI 3rd supplement, proceedings of the conference entitled "Archaeology, Antiquity and Hellenicity in twentieth century Greece".SIDERIS, A. (2008): "Recontextualised Antiquity: Interpretative VR Visualization of Ancient Art and Architecture", in Makropoulos T. A. and Papachristos N. M. (eds), Proceedings: International Symposium on "Information and Communication Technologies in Cultural Heritage", Ioannina, 16- 18/10/2008 (Ioannina 2008), pp. 159-176.UNESCO (2003): Convention for the Safeguarding of the Intangible Cultural Heritage.Σίδερης Α., (2008): "Συγκείμενα, ερμηνείες και αφήγηση ιστοριών σε εικονικά αρχαιολογικά ̟εριβάλλοντα", Πρακτικά της ημερίδας ΑφήγησηΙστοριών (Storytelling) σε Αρχαιολογικά Εικονικά Περιβάλλοντα, 25/11/2008 Αθήνα, Ελληνικός Κόσμος, (online publication)