Corpus ID: 201820279

Negative Instance for the Edge Patrolling Beacon Problem

  title={Negative Instance for the Edge Patrolling Beacon Problem},
  author={Zachary Abel and H. Akitaya and E. Demaine and M. Demaine and Adam Hesterberg and Matias Korman and Jason S. Ku and J. Lynch},
Can an infinite-strength magnetic beacon always ``catch'' an iron ball, when the beacon is a point required to be remain nonstrictly outside a polygon, and the ball is a point always moving instantaneously and maximally toward the beacon subject to staying nonstrictly within the same polygon? Kouhestani and Rappaport [JCDCG 2017] gave an algorithm for determining whether a ball-capturing beacon strategy exists, while conjecturing that such a strategy always exists. We disprove this conjecture… Expand
2 Citations
Chasing Puppies: Mobile Beacon Routing on Closed Curves
This paper solves an open problem posed by Michael Biro at CCCG 2013 that was inspired by his and others’ work on beacon-based routing and proves that the human can always catch the puppy in finite time. Expand
Chasing Puppies


Efficient algorithms for beacon routing in polygons
The quality of a “successful” beacon attraction is considered, an upper bound of √ 2 is provided on the ratio between the length of the beacon trajectory and thelength of the geodesic distance in a simple polygon, and an O(n log n) time algorithm is introduced to solve the problem of computing the shortest beacon watchtower in a polygonal terrain. Expand
An Optimal Algorithm to Compute the Inverse Beacon Attraction Region
The total complexity of the inverse attraction region of a point in a simple polygon is linear, and a matching $\Omega(n\log n)$ lower bound for this task is proved in the algebraic computation tree model of computation, even if thepolygon is monotone. Expand
Combinatorics of Beacon-based Routing in Three Dimensions
It is shown that beacons are always sufficient and sometimes necessary to route between any pair of points in a given polyhedron $P$, where $m$ is the number of tetrahedra in a tetrahedral decomposition of $P$. Expand
A Combinatorial Bound for Beacon-based Routing in Orthogonal Polygons
Beacon attraction is a movement system whereby a robot (modeled as a point in 2D) moves in a free space so as to always locally minimize its Euclidean distance to an activated beacon (which is also aExpand
Beacon-Based Algorithms for Geometric Routing
A polynomial-time algorithm for routing from a point s to a point t using a discrete set of candidate beacons is established, as well as a 2-approximation and a PTAS for routing between beacons placed without restriction in P. Expand
Combinatorics of Beacon Routing and Coverage
In simple polygons with n vertices it is shown that ⌊ n 2 ⌋ − 1 beacons are sometimes necessary and always sufficient, and in polygONS with h holes it is established that ⊙ n 2⌊ −h−1 beaconsAre sometimes necessary while h− 1Beacons are always sufficient. Expand
Edge patrolling beacon
  • In Abstracts from the 20th Japan Conference on Discrete and Computational Geometry, Graphs, and Games,
  • 2017
Personal communication held after the presentation
  • 2017
Beacon-based routing and guarding
Beacon-based routing and coverage
  • In Abstracts from the 21st Fall Workshop on Computational Geometry,
  • 2011