Motivating car drivers to change their habitual driving behavior toward a less fuel consuming way is an ambitious task. In this paper a game like approach based on the concept of location based challenges will be presented in order to allow drivers to compare their fuel efficiency with other drivers of the same route section in real-time. A mobile device display was used to provide feedback on ...

We study the consistency of listwise ranking methods with respect to the popular Normalized Discounted Cumulative Gain (NDCG) criterion. State of the art listwise approaches replace NDCG with a surrogate loss that is easier to optimize. We characterize NDCG consistency of surrogate losses to discover a surprising fact: several commonly used surrogates are NDCG inconsistent. We then show how to ...

Using Yelp data, we built a restaurant recommendation system for individuals and groups. For each of 4.9k individual Yelp users, we create a ranking SVM model with features encompassing users’ food preferences and dietary restrictions, such as cuisine type, services o↵ered, ambience, noise level, average rating, etc. Our recommendation system for individual users achieved 72% average prediction...

Existing approaches on XML keyword search mostly focus on querying over single data source. However, searching over hundreds or even thousands of (distributed) data sources by sequentially querying every single data source is extremely high cost, thus it can be impractical. In this paper, we propose an approach for selecting top-k data sources to a given query in order to avoid high cost of sea...

Suppose all the individuals in a field are linearly ordered. Groups of individuals form teams. Is there a perfect ranking function of each team based on the members of the team? We prove that under a very mild and reasonable set of axioms for the ranking function, no such ranking function exists. AMS Subject Classification: 68R05, 91F10, 06A05, 06A07.