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JCT
2011
77views more  JCT 2011»
8 years 5 months ago
Hypercube orientations with only two in-degrees
We consider the problem of orienting the edges of the n-dimensional hypercube so only two different in-degrees a and b occur. We show that this can be done, for two specified in...
Joe Buhler, Steve Butler, Ronald L. Graham, Eric T...
DMTCS
2007
49views Mathematics» more  DMTCS 2007»
8 years 10 months ago
Waiting Time Distributions for Pattern Occurrence in a Constrained Sequence
A binary sequence of zeros and ones is called a (d, k)-sequence if it does not contain runs of zeros of length either less than d or greater than k, where d and k are arbitrary, b...
Valery T. Stefanov, Wojciech Szpankowski
COLOGNETWENTE
2008
8 years 12 months ago
Constrained Decompositions of Integer Matrices and their Applications to Intensity Modulated Radiation Therapy
We consider combinatorial optimization problems arising in radiation therapy. Given a matrix I with non-negative integer entries, we seek for a decomposition of I as a weighted su...
Céline Engelbeen, Samuel Fiorini
CIE
2009
Springer
9 years 2 months ago
Functions Definable by Arithmetic Circuits
An arithmetic circuit is a labelled, directed, acyclic graph specifying a cascade of arithmetic and logical operations to be performed on sets of non-negative integers. In this pap...
Ian Pratt-Hartmann, Ivo Düntsch
SYNASC
2005
IEEE
86views Algorithms» more  SYNASC 2005»
9 years 4 months ago
One and Two Polarizations, Membrane Creation and Objects Complexity in P Systems
We improve, by using register machines, some existing universality results for specific models of P systems. P systems with membrane creation are known to generate all recursivel...
Artiom Alhazov, Rudolf Freund, Agustin Riscos-N&ua...
ICIP
2003
IEEE
10 years 48 min ago
Indexing and segmenting colour images using neighbourhood sequences
In this paper we present some methods for indexing and segmenting colour images. The proposed procedures are based on well-known algorithms, but now we use digital distance functi...
András Hajdu, Benedek Nagy, Zoltán Z...
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