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APPML
2008
159views more  APPML 2008»
15 years 3 months ago
The rook problem on saw-toothed chessboards
A saw-toothed chessboard, or STC for short, is a kind of chessboard whose boundary forms two staircases from left down to right without any hole inside it. A rook at square (i, j)...
Hon-Chan Chen, Ting-Yem Ho
ENDM
2010
110views more  ENDM 2010»
15 years 3 months ago
Modelling the Hop Constrained Connected Facility Location Problem on Layered Graphs
Gouveia et al. [3] show how to model the Hop Constrained Minimum Spanning tree problem as Steiner tree problem on a layered graph. Following their ideas, we provide three possibil...
Ivana Ljubic, Stefan Gollowitzer
126
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JCO
2008
76views more  JCO 2008»
15 years 3 months ago
On the inapproximability of the exemplar conserved interval distance problem of genomes
In this paper we present two main results about the inapproximability of the exemplar conserved interval distance problem of genomes. First, we prove that it is NP-complete to deci...
Zhixiang Chen, Richard H. Fowler, Bin Fu, Binhai Z...
DAM
2007
94views more  DAM 2007»
15 years 3 months ago
New formulations for the Kissing Number Problem
Determining the maximum number of D-dimensional spheres of radius r that can be adjacent to a central sphere of radius r is known as the Kissing Number Problem (KNP). The problem ...
Sergei Kucherenko, Pietro Belotti, Leo Liberti, Ne...
126
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EOR
2007
103views more  EOR 2007»
15 years 3 months ago
Bi-criteria scheduling problems: Number of tardy jobs and maximum weighted tardiness
Consider a single machine and a set of   jobs that are available for processing at time 0. Job ¡ has a processing time ¢¤£ , a due date ¥¦£ and a weight §¨£ . We consid...
Yumei Huo, Joseph Y.-T. Leung, Hairong Zhao