Michel Buffa

WikiNEXT: a wiki for exploiting the web of data

This paper presents WikiNEXT, a semantic application wiki. WikiNEXT lies on the border between application wikis and modern web based IDEs (Integrated Development Environments) like jsbin.com, jsfiddle.net, cloud9ide.com, etc. It has been initially created for writing documents that integrate data from external data sources of the web of data, such as DBPedia.org or FreeBase.com, or for writing interactive tutorials (e.g. an HTML5 tutorial, a semantic web programming tutorial) that mix text and interactive examples in the same page. The system combines some powerful aspects from (i) wikis, such as ease of use, collaboration and openness, (ii) semantic web/wikis such as making information processable by machines and (iii) web-based IDEs such as instant development and code testing in a web browser. WikiNEXT is for writing documents/pages as well as for writing web applications that manipulate semantic data, either locally or coming from the web of data. These applications can be created, edited or cloned in the browser and can be used for integrating data visualizations in wiki pages, for annotating content with metadata, or for any kind of processing. WikiNEXT is particularly suited for teaching web technologies or for writing documents that integrate data from the web of data.

A Multi-context Framework for Modeling an Agent-based Recommender System

In this paper, we propose a multi-agent recommender system based on the Belief-Desire-Intention (BDI) n nmodel applied to multi-context systems. First, we extend the BDI model with additional contexts to deal n nwith sociality and information uncertainty. Second, we propose an ontological representation of planning n nand intention contexts in order to reason about plans and intentions. Moreover, we show a simple real-world n nscenario in healthcare in order to illustrate the overall reasoning process of our model.

Towards an open Web Audio plugin standard

Web Audio is a recent W3C API that brings the world of computer music applications to the browser. Although developers have been actively using it since the first beta implementations in 2012, the number of web apps built using Web Audio API cannot yet compare to the number of commercial and open source audio software tools available on native platforms. Many of the sites using this new technology are of an experimental nature or are very limited in their scope. While JavaScript and Web standards are increasingly flexible and powerful, C and C++ are the languages most often used for real-time audio applications and domain specific languages such as FAUST facilitate rapid development with high performance. Our work aims to create a continuum between native and browser based audio app development and to appeal to programmers from both worlds. This paper presents our proposal including guidelines and proof of concept implementations for an open Web Audio plug-in standard - essentially the infrastructure to support high level audio plug-ins for the browser.

Real-Time Emulation of a Marshall JCM 800 Guitar Tube Amplifier, Audio FX Pedals, in a Virtual Pedal Board

The ANR project WASABI will last 42 months and consists in developing a 2 million songs database with interactive WebAudio enhanced client applications. Client applications target composers, music schools, sound engineering schools, musicologists, music streaming services and journalists. In this paper, we present a virtual pedal board (a set of chainable audio effects on the form of pedals), and a guitar tube amplifier simulation for guitarists, that will be associated with songs from the WASABI database. Music schools and music engineering schools are interested in such tools that can be run in a Web page, without the need to install any further software. Take a classic rock song: isolate the guitar solo, study it, then mute it and play guitar real-time along the other tracks using an online guitar amplifier that reproduces the real guitar amp model used in the song, with its signature sound, proper dynamic and frequency response. Add some audio effects such as a reverberation, a delay, a flanger, etc. in order to reproduce Pink Floyds guitar sound or Eddie Van Halen famous Brown Sound. Learn interactively, guitar in hands, how to fine tune a compressor effect, or how to shape the sound of a tube guitar amp, how to get a modern metal or a Jimi Hendrix sound, using only your Web browser.