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- Gunnar Brinkmann, Sam Greenberg, Catherine S. Greenhill, Brendan D. McKay, Robin Thomas, Paul Wollan
- Discrete Mathematics
- 2005

A simple quadrangulation of the sphere is a finite simple graph embedded on the sphere such that every face is bounded by a walk of 4 edges. We consider the following classes of simple quadrangulations: arbitrary, minimum degree 3, 3-connected, and 3-connected without non-facial 4-cycles. In each case we show how the class can be generated by starting with… (More)

- Nayantara Bhatnagar, Sam Greenberg, Dana Randall
- SODA
- 2008

We study the behavior of random walks along the edges of the stable marriage lattice for various restricted families of allowable preference sets. In the "<i>k</i>-attribute model," each man is valued in each of <i>k</i> attributes, and each woman's ranking of the men is determined by a linear function, representing her relative ranking of those attributes;… (More)

- Sam Greenberg, Amanda Pascoe Streib, Dana Randall
- SODA
- 2009

Monotonic surfaces spanning finite regions of Zd arise in many contexts, including DNA-based self-assembly, card-shuffling and lozenge tilings. We explore how we can sample these surfaces when the distribution is biased to favor higher surfaces. We show that a natural local chain is rapidly mixing with any bias for regions in Z2, and for bias λ > d2 in Zd,… (More)

- Sam Greenberg, Dana Randall
- Theor. Comput. Sci.
- 2009

Algorithms based on Markov chains are ubiquitous across scientific disciplines as they provide a method for extracting statistical information about large, complicated systems. For some self-assembly models, Markov chains can be used to predict both equilibrium and non-equilibrium dynamics. In fact, the efficiency of these self-assembly algorithms can be… (More)

- D. P. Richardson, A. C. Messer, S. Greenberg, H. H. Hagedorn, J. Meinwald
- Journal of Chemical Ecology
- 1989

Four sesquiterpenoids (2, 4, 7, and9) have been isolated and characterized from the termiticidal fraction ofDipterocarpus kerrii resin. The major constituent of this resin is α-gurjunene (1).

- Nayantara Bhatnagar, Sam Greenberg, Dana Randall
- APPROX-RANDOM
- 2006

- Craig A. Tovey, Sam Greenberg, Sven Koenig
- ICRA
- 2003

D* is a planning method that always routes a robot in initially unknown terrain from its current location to a given goal location along a shortest presumed unblocked path. The robot moves along the path until it discovers new obstacles and then repeats the procedure. D* has been used on a large number of robots. It is therefore important to analyze the… (More)

- Sam Greenberg, Dana Randall
- Algorithmica
- 2007

We show that local dynamics require exponential time for two sampling problems motivated by statistical physics: independent sets on the triangular lattice (the hard-core lattice gas model) and weighted even orientations of the two-dimensional Cartesian lattice (the 8-vertex model). For each problem, there is a parameter λ known as the fugacity, such that… (More)

- Apurva Mudgal, Craig A. Tovey, Sam Greenberg, Sven Koenig
- SIAM J. Discrete Math.
- 2005

D∗ is a greedy heuristic planning method that is widely used in robotics, including several Nomad class robots and the Mars rover prototype, to reach a destination in unknown terrain. We obtain nearly sharp lower and upper bounds of Ω(n logn/ log logn) and O(n logn), respectively, on the worst-case total distance traveled by the robot, for the grid graphs… (More)

- Sam Greenberg, Dana Randall, Amanda Pascoe Streib
- ArXiv
- 2017

Monotonic surfaces spanning finite regions of Z arise in many contexts, including DNAbased self-assembly, card-shuffling and lozenge tilings. One method that has been used to uniformly generate these surfaces is a Markov chain that iteratively adds or removes a single cube below the surface during a step. We consider a biased version of the chain, where we… (More)