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Identifying and Analyzing Safety Critical Maneuvers from High Resolution AIS Data

Mestl T., Tallakstad K.T., Castberg R.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2016

Vol. 10, no. 1

69--77

We demonstrate the value in previously disregarded parameters in AIS data, and present a novel way of quickly identifying and characterizing potentially safety critical situations for vessels with a properly configured AIS transponder. The traditional approach of studying (near) collision situations, is through vessel conflict zones, based on vessel location and speed from low resolution AIS data. Our approach utilizes the rate of turn parameter in the AIS signal, at maximum time resolution. From collision investigation reports it is often seen that prior to or at collision navigators perform frenetic rudder actions in the hope to avoid collision in the last second. These hard maneuverings are easily spotted as non-normal rate of turn signals. An identified potential critical situation may then be further characterized by the occurring centripetal acceleration a vessel is exposed to. We demonstrate the novelty of our methodology in a case study of a real ship collision. As the rate of turn parameter is directly linkable to the navigator behavior it provides information about when and to what degree actions were taken. We believe our work will therefore inspire new research on safety and human factors as a risk profiles could be derived based on AIS data.

Electric field manipulation of particles in leaky dielectric liquids

Rozynek Z., Castberg R., Kalicka A., Jankowski P., Garstecki P.

Archives of Mechanics

2015

Vol. 67, nr 5

385--399

Patchy colloidal capsules, i.e., hollow structures with permeable heterogeneous surfaces, possess advantageous properties when compared with their homogenous counterparts. For example, owing to specific interactions between patches they can self-assemble into complex structures to form functional materials. Fabrication of patchy colloidal capsules has long been theorized by scientists able to design different models, but the actual production of them remains a challenge. Here, we demonstrate how to manipulate colloidal particles on a surface of a droplet with electric fields. We present three examples of patchy structures formed via electrohydrodynamic microflows and electro-coalescence. In addition, we show electro-orientation of patchy capsules composed of both nonconductive polymeric particles and conductive silver coated particles. Finally, we discuss the importance of an appropriate selection of oils and particles.