Too Tense for Candy Crush – How Emotions Affect what Kind of Distractions we Welcome

Push notifications are increasingly being used to engage mobile device users with app content. News organizations deliver breaking-news notifications, social platforms inform about new content, games inform about status updates game, etc … with the goal of making the user engage with the service. In this research, we – Kostadin Kushlev, University of Virginia, Bruno […]

Exporting RandomForest Models to Java Source Code

This post shares a tiny toolkit to export WEKA-generated Random Forest models into light-weight, self-contained Java source code for, e.g., Android. It came out of my need to include Random Forest models into Android apps. Previously, I used to use Weka for Android. However, I did not find a way to export a Random Forest […]

App Store Studies : How to Ask for Consent?

App Stores, such as Apple’s App Store or Google Play, provide researchers the opportunity to conduct experiments with a large number of participants. If we collect data during these experiments, it may be necessary to ask for the users’ consent beforehand. The way we ask for the users’ consent can be crucial, because nowadays people […]

Ambient Visualisation of Social Network Activity

Social network, such as Facebook or Twitter, are an important factor in the communication between individuals of the so called digital natives generation. More and more often, they are used to exchange short bursts of thoughts are comments as a means of staying connected with each other. The instant communication enabled by those social networks […]

A Tactile Compass for Eyes-free Pedestrian Navigation

The idea came up when I was heading back to the hotel from a conference dinner at MobileHCI 2008 in Amsterdam. I had no orientation. The only guide I had was a map on my Nokia phone. Not being familiar with Amsterdam, the route let me right through the busy areas of the city center. […]

When Attention is not Scarce – Detecting Boredom from Mobile Phone Usage (UbiComp ’15)

When Attention is not Scarce – Detecting Boredom from Mobile Phone Usage from Martin Pielot In times of information overload, attention has become a limiting factor in the way we consume information. Hence, researchers suggested to treat attention as a scarce resource coined the phrase attention economy. Given that attention is also what pays the bills […]

How the Phone’s Vibration Alarm can help to Save Battery

“Not sure how long my hero’s battery will last with GPS on and my phone vibrating every second to indicate if on right track!?!” – This and similar concerns have frequently been expressed when I presented the PocketNavigator – a navigation system guiding pedestrians by vibration patterns instead of spoken turning instructions. To quantify how […]

Will they use it? Will it be useful? In-Situ Evaluation of a Tactile Car Finder.

When we develop new technology, we want to know if it will have the potential to be successful in the real world. This is not trivial! People may sincerely enjoy our technology when we expose them to it in a lab- or a field study. They may perform better than with previous solutions at the […]

OpenAL4Android

In the comments to my post on OpenAL on Android some visitors asked to provide some high-level examples of how to use OpenAL. In this post you will find a light-weight Android Java library, consisting of four classes only, that allows you to create complex 3D sound scenes. An additional Hello World example building upon […]

Android User Hate Parade

Stupid! – Garbage – Hate it!!!!!!! … …. these are some of the few comments when publishing apps in the Android Market for free. This can be really frustrating for developers. Here are some of the worst example I have encountered in my life as an Android developer: The “it does not work -> 1 […]

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