User engagement is crucial to the long-term success of a mobile app. Several metrics, such
as dwell time, have been used for measuring user engagement. However, how to effectively …

Smartphone/Tablet users are approximately 3 million all over the world. It is likely to
increase by several 100 million in the next few years. Around 40% of these users read …

Online ranker evaluation is one of the key challenges in information retrieval. Although the
preferences of rankers can be inferred by interleaving methods, the problem of how to …

The mobile ecosystem is dramatically growing towards an unprecedented scale, with an
extremely crowded market and fierce competition among app developers. Today, keeping …

With the current digitisation of our world, we have witnessed a surge in the presence and
use of mobile devices. Consequently, there has been a natural increase in the use of mobile …

Mobile devices have become an increasingly ubiquitous part of our everyday life, which are
not only used for basic communication. Nowadays, the need for mobile services arises from …

Ranking system is the core part of modern retrieval and recommender systems, where the
goal is to rank candidate items given user contexts. Optimizing ranking systems online …

Preamble. We live in a world with more data and technology than ever. Most of us these
days, have an incredibly compact and powerful computer in their pockets in the form of a …

The Corona pandemic and the accompanying acceleration of digitization in the
Germanspeaking world have shown that the conventional working models in many editorial …