by Christoph Köhn and Ute Ebert

Active thunderstorms can emit gamma-rays and even antimatter. In fact, growing lightning channels can act as enormous particle accelerators above our heads. Researchers of the Multiscale Dynamics group at CWI have modelled and simulated these multiscale processes. They corrected previous calculations of gamma-ray emissions and, for the first time, computed the emission and propagation of positrons and neutrons. The neutrons are produced in nuclear reactions in air and might reach the ground.

by Federico Maggi, Stefano Zanero, and Evangelos Markatos

Looking back at the evolution of cyber criminal activities, from the nineties to the present day, we observe interesting trends coming together in what may seem a perfectly orchestrated scene. In parallel with the ‘security by design’, we recall the importance of reactive security in a field of ever-changing arms races.

by Jan Camenisch, Anja Lehmann, Anna Lysyanskaya and Gregory Neven

The authors have developed a three-pronged approach that can secure all of your passwords for social media, email, cloud files, shopping and financial websites, with one practically hack-proof password. This password is secured by the new “Memento protocol.”

by Ioannis Askoxylakis, Paschalis Papagrigoriou, Diomedes Kastanis, Panos Karampelas, and George Spanoudakis

The SIREN project (Secure, Interoperable, UAV-assisted, Rapid Emergency Deployment Communication and sensing Infrastructure) implements a secure, distributed, open, self-configured and emergency-aware network and service platform for automated, secure and dependable support of multiple mission critical applications in highly demanding and dynamic emergency environments.

by Ioannis Refanidis and Christos Emmanouilidis

Following the masses is one way of being a tourist. But the modern creative tourist is eager to forge a personal trail. Tailoring an itinerary to individual desires has always been the realm of highly specialized tour operators. Context-aware computing and recommender systems make it possible to offer personalized services in tourism. MYVISITPLANNER is a cloud-based service employing a recommender engine to offer personalized suggestions for tour activities and a planning tool to create appropriate tour itineraries. Recommendations are offered on the basis of a hybrid approach that takes into account both a taxonomy of possible activities, as well as user preferences and past recommendations, thus offering recommendations tailored to the visit profile [1].

by Andrea Esuli and Fabrizio Sebastiani

Quantification - also known as class prior estimation – is the task of estimating the relative frequencies of classes in application scenarios in which such frequencies may change over time. This task is becoming increasingly important for the analysis of large and complex datasets. Researchers from ISTI-CNR, Pisa, are working with supervised learning methods explicitly devised with quantification in mind.

Next issue: January 2019
Special theme:
Transparency in Algorithmic Decision Making
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