Talk at the Universidad San Buenaventura, Cali, CO

Last Tuesday September 11th I presented some of my research work at the Universidad San Buenaventura in Cali, Colombia. I thank my host, Sergio Bromberg, director of the GTA arts and technology group, Rocío Segovia Jiménez, director of the LIDIS Lab, and my friends Mónica Arroyave and Diego Duque for the interesting discussions around HCI and computer science teaching topics after the talk.

September 21, 2014

MixPerceptions: finalist in the AR/VR contest at SIGGRAPH

We are so proud! Mixperceptions, a product of the hard work of José San Pedro, Aurelio San Pedro, Matylda Szmukier and myself, was selected as a finalist in the AR/VR contest at SIGGRAPH 2014.
More information here.

September 21, 2014

MixPerceptions: the hidden sound and movement in paintings

MixPerceptions is an art installation where users interact with artworks using their smartphone or tablets and headphones. The interaction is achieved by means of an augmented reality app that reveals rich and dynamic visual and auditory elements that create an engaging multi-sensorial experience.

MixPerceptions brings paintings to life, offering a unique and personal experience to every user, and provoking emotive feelings while encouraging exploration and engagement.

It was created by a multidisciplinary team consisting of Aurelio San Pedro, José San Pedro, Matylda Smukier and myself.

MixPerceptions was first presented during the Art Exhibition of the ACM Multimedia Conference that took place during October 21-25t of 2013, in Barcelona.

I created the soundtrack, sound design and programmed the audio interaction using Puredata.

Visit MixPerceptions website for more information on the project.

November 10, 2013

TuneMap: an interactive geolocated music information browser

Screen shot 2014-02-11 at 24.53.20
TuneMap: an interactive geolocated music information browser“, a paper written by me and based on the TuneMap project, was accepted for publication on the proceedings of the Re-New Digital Arts Festival, Copenhagen, Denmark, 2013. The proceedings can be read from here.

November 3, 2013

“Your browsing behavior for a Big Mac” – WWW2013

014-Big_Mac-alone“Your browsing behavior for a Big Mac: economics of personal information online” at the 22nd International World Wide Conference (WWW2013), in Rio de Janeiro, Brazil.

You can download the paper from here.
And the slides from here.

May 17, 2013

Your browsing behavior for a Big Mac: Economics of Personal Information Online

Written by Christopher Riederer, Vijay Erramilli, Mauro Cherubini, Rodrigo de Oliveira and myself, this paper is the conclusion of a user study we conducted by the end of 2011 in Telefónica I+D. It has been accepted for publication in the proceedings of the 22nd International World Wide Web Conference (WWW2013). The abstract:

Most online service providers offer free services to users and in part,these services collect and monetize personally identifiable information (PII),primarily via targeted advertisements. Against this backdrop of economic exploitation of PII, it is vital to understand the value that users put to their own PII.Although studies have tried to discover how users value their privacy,little is known about how users value their PII while browsing,or the exploitation of their PII. Extracting valuations of PII from users is non-trivial – surveyscannot be relied on as they do not gatherinformation of the context where PII is being released,thus reducing validity of answers. In this work, we rely on refined Experience Sampling – a data collection method that probes users to valuate their PII at the time and place where it wasgenerated in order to minimize retrospective recall and henceincrease measurement validity. For obtaining an honest valuation of PII, we use a reverse second price auction. We developed a web browser plugin and had 168 users – living in Spain -install and use this plugin for 2 weeksin order to extract valuations of PII in different contexts.
We found that users value items of their online browsing historyfor about 7€ (10USD), and they give higher valuations to their offline PII, such as age and address (about 25€ or 36USD).When it comes to PII shared in specific online services, users value informationpertaining to financial transactions and social network interactionsmore than activities like search and shopping. No significantdistinction was found between valuations of different quantities of PII (e.g. one vs. 10 search keywords), but deviation was foundbetween types of PII (e.g. photos vs. keywords). Finally, the users’ preferred goods for exchanging their PII included money and improvements in service, followed by getting more free services and targeted advertisements.

March 25, 2013

Nueva web de Spacebarman / Spacebarman’s new web page

El nuevo look, más limpio y fácil de navegar de la nueva página de Spacebarman permite un acceso eficiente a nuestro contenido audivisual y a las actualizaciones de nuestro Twitter, Facebook y blog. Te va a gustar, lo sabemos 😉

Visítala y suscríbete a nuestra lista de correos, mostraremos nuesto agradecimiento enviándote música nueva!
With a cleaner, easier to navigate design, Spacebarman’s new home page offers quick access to all our audiovisual material as well as blog, Twitter and Facebook updates.
We know you will like it 😉

Visit us and subscribe to our mailing list: we will show our gratitude by by sending you cool new songs!

September 26, 2012

Presentation at MobileHCI 2012

I will present a note paper titled “A Note Paper on Note-Taking: Understanding Annotations of Mobile Phone Calls” this saturday at MobileHCI 2012, in San Francisco.

Read more…

September 19, 2012

Nuevo video+regalo / New video+giveaway

Finalmente, nuestro primer videoclip!
Julián Manrique, gran amigo y colega, dirigió este estupendo video.
Fue grabado en el Parc del Laberint d’Horta y en diversas calles de la Ciutat Vella, en Barcelona.

Recomendamos verlo en pantalla completa!
(No olvides que puedes descargar el EP completo de “A veces me pierdo” de nuestro Bandcamp.)

Por último (pero no menos importante), tenemos un regalo. Síguenos en Twitter (@spacebar), trina el link al video clip ( incluyendo el hashtag #spacebarman y te enviaremos un link para que descargues una canción inédita nuestra.
Read more…

Informal data mining: a mess of PDF files

Informal data mining

I have a folder with random pdf files, occupying almost 2GB of my hard drive.

Every time I notice I’m running our of space, I arm myself with courage and take the firm decision to clean it.

However, when I sort its files by date in order to start getting rid of oldest ones first, I stop for a second when I start noticing that it accurately tells my recent story. I browse trough its documents and find my interests and activities during the last 4 years (since I bought the computer I currently own) are reflected there. I can therefore see how and when they changed depending on whether I was working or studying, and on my job, hobby or research topics at the time.

I’ve found, in chronological order, payment receipts from the last company I worked for in Colombia, then papers required by the Spanish embassy for my student visa, later on registration papers from the university, and more recently, flyers related to activities in the company I currently work for.

And everything is interleaved with manuals and descriptions of various pieces of music gear, that I’ve been checking across time.

After some time going through the files, I lose my initial courage and stop.

I think I will never purge that folder. Instead I will let it to continue growing, and eventually I will change its name to “Nostalgia”.

August 30, 2012