Auditing provides essential security control in computer systems by keeping track of all access attempts, including both legitimate and illegal attempts. This phase can be useful the context audits, where eventual misbehaving parties held accountable. Blockchain technology provide trusted auditability required for systems. In this paper, we propose a distributed Attribute-Based Access Control (...

This paper describes the participation of the Bioingenium research group of Universidad Nacional de Colombia in the ImageCLEF2012 Medical Retrieval challenge, specifically in the ad-hoc image-based retrieval task. The methods used for solving textual and visual queries with which we submitted uni-modal runs are described. They were ranked 1st and 3rd respectively. These results have been obtain...

A government agency wants an infrastructure-based public service to be provided. Our experimental study compares two di¤erent modes of provision. In a public-private partnership, the two tasks of building the infrastructure and operating it are delegated to one private contractor (a consortium), while under traditional procurement, these tasks are delegated to separate contractors. We …nd suppo...

Tactile sensors (antennae) play an important role in the animal kingdom. They are also very useful as sensors in robotic scenarios, where vision systems may fail. Active tactile movements increase the sampling performance. Here we directly control movements of the antenna of a simulated hexapod using an echo state network (ESN). ESNs can store multiple motor patterns as attractors in a single n...