We study the problem of maximizing privacy of data sets by adding random vectors generated via synchronized chaotic oscillators. In particular, we consider the setup where information about data sets, queries, is sent through public (unsecured) communication channels to a remote station. To hide private features (specific entries) within the data set, we corrupt the response to queries by adding random vectors. We send the distorted query (the sum of the requested query and the random vector) through the public channel. The distribution of the additive random vector is designed to minimize the mutual information (our privacy metric) between private entries of the data set and the distorted query. We cast the synthesis of this distribution as a convex program in the probabilities of the additive random vector. Once we have the optimal distribution, we propose an algorithm to generate pseudo-random realizations from this distribution using trajectories of a chaotic oscillator. At the other end of the channel, we have a second chaotic oscillator, which we use to generate realizations from the same distribution. Note that if we obtain the same realizations on both sides of the channel, we can simply subtract the realization from the distorted query to recover the requested query. To generate equal realizations, we need the two chaotic oscillators to be synchronized, i.e., we need them to generate exactly the same trajectories on both sides of the channel synchronously in time. We force the two chaotic oscillators into exponential synchronization using a driving signal. Simulations are presented to illustrate our results.

Our second issue of ACM THRI this year brings together another collection of insightful and thoughtful articles pushing the boundaries of thought in Human-Robot Interaction. Furthering ideas at the meeting of HRI and artificial intelligence, our first article, from Heard et al., presents a human workload assessment algorithm to enable dynamic task allocation that improves the collective performance of human-robot teams. Stefanov et al. use artificial neural networks for the generation of robot gaze directions in dialogues including multiple individuals that analyze human behavior across combinations of movement and speech signals. The middle section of this issue focuses on the perspectives of older adults and their acceptance of robotic technology. Yeh et al. deliver findings that that can improve acceptance of robots through establishing personal relevance, even though such populations tend to have more negative initial reactions to robots. Jung and Ludden explored the potential for robotic exoskeletons to be accepted by older adults as viable mobility aids, yielding insights that will be important for the design of usable devices with this technology. The

Designing the Invisible provides a foundational collection of the main definitions, theories, and concepts necessary for understanding and learning about the Service Design field. The main aim of t...

This article reviews Industry 4.0, its emerging phase, implementation, challenges, benefits, etc. It combines various fields where it has any influence and leaves some changes and where it requires some adaptation. Papers from the last 4 years are taken and analyzed, what is written about this topic in various countries with different backgrounds and economic development. Industry 4.0 affects the production environment by introducing new technologies which require a better-educated workforce so it affects education and requires some changes in curricula and ways of teaching. It brings new challenges and asks for a new approach from management to be able to handle fast and big changes in the business environment and to implement such innovation in production effectively.

This paper concerns the problem of learning control policies for an unknown linear dynamical system to minimize a quadratic cost function. We present a method, based on convex optimization, that accomplishes this task robustly: i.e., we minimize the worst-case cost, accounting for system uncertainty given the observed data. The method balances exploitation and exploration, exciting the system in such a way so as to reduce uncertainty in the model parameters to which the worst-case cost is most sensitive. Numerical simulations and application to a hardware-in-the-loop servo-mechanism demonstrate the approach, with appreciable performance and robustness gains over alternative methods observed in both.