We present an approach for identifying the occluding contour and determining its sidedness using an active (i.e., moving) observer. It is based on the non-stationarity property of the visible rim: When the observer’s viewpoint is changed, the visible rim is a collection of curves that “slide,” rigidly or non-rigidly, over the surface. We show that the observer can deterministically choose three...

An important step in conducting qualitative research on large collections of text is reducing the size of the collection to one that is manageable. While it is common to use a variety of simple sampling methods, the limitation of these approaches is that their mechanisms do not consider the relevance of the data. We have developed exploratory search methods that leverage visual analytics to pro...

26 Electrical stimulation has been delivered to the basal ganglia (BG) to treat intractable 27 symptoms of a variety of clinical disorders. However, it is still unknown how such 28 treatments improve behavioral symptoms. A difficulty of this problem is that artificial 29 signals created by electrical stimulation interact with intrinsic signals before influencing 30 behavior, thereby making it i...

What real-time, qualitative viewpoint-control behaviors are important for performing global visual exploration tasks such as searching for specific surface markings, building a global model of an arbitrary object, or recognizing an object? In this paper we consider the task of purposefully controlling the motion of an active, monocular observer in order to recover a global description of a smoo...

Relying on random and purposive moving agents, we simulated human movement in large street networks. We found that aggregate flow, assigned to individual streets, is mainly shaped by the underlying street structure, and that human moving behavior (either random or purposive) has little effect on the aggregate flow. This finding implies that given a street network, the movement patterns generate...

Starving tumors eat metabolic enzyme Xia et al. describe a way to force cancer cells to destroy a key metabolic enzyme they need to survive. Autophagy helps cancer cells survive the stressful environment inside a tumor. However, blocking the process doesn’t kill cancer cells, so researchers have been looking for a way to make cells vulnerable to autophagy shutdown. Xia et al. used an ovarian ca...