2006-11-01から1ヶ月間の記事一覧

On compressing frequent patterns

Dong Xin, Jiawei Han, Xifeng Yan and Hong Cheng Data & Knowledge Engineering Volume 60, Issue 1 , January 2007, Pages 5-29 http://dx.doi.org/10.1016/j.datak.2006.01.006頻出パターンの数が膨大なので,それらを代表するようなパターンを求める問…

A note on Roman domination in graphs

Hua-Ming Xing, Xin Chen and Xue-Gang Chen Discrete Mathematics Volume 306, Issue 24 , 28 December 2006, Pages 3338-3340 http://dx.doi.org/10.1016/j.disc.2006.06.018一部で流行っているRoman dominationに関する研究. グラフのRoman dominationと…

New polynomial-time algorithms for Camion bases

Komei Fukuda and Antoine Musitelli Discrete Mathematics Volume 306, Issue 24 , 28 December 2006, Pages 3302-3306 http://dx.doi.org/10.1016/j.disc.2006.06.015お世話になりっぱなしの福田先生の論文. 行列Mに対して,その(列)基底Bを考える.非基…

Optimal broadcast domination in polynomial time

Pinar Heggernes and Daniel Lokshtanov Discrete Mathematics Volume 306, Issue 24 , 28 December 2006, Pages 3267-3280 http://dx.doi.org/10.1016/j.disc.2006.06.013WG2005で聞いた話. グラフのbroadcast dominationはErwin (2004) が提案した概念で…

Graph polynomials from principal pivoting

Roland Glantz and Marcello Pelillo Discrete Mathematics Volume 306, Issue 24 , 28 December 2006, Pages 3253-3266 http://dx.doi.org/10.1016/j.disc.2006.06.003Arratia, Bollobas, and Sorkin (SODA 2000) が提案したグラフのinterlace polynomialを…

Extreme point axioms for closure spaces

Kazutoshi Ando Discrete Mathematics Volume 306, Issue 24 , 28 December 2006, Pages 3181-3188 http://dx.doi.org/10.1016/j.disc.2006.04.034お世話になっている安藤さんの論文.謝辞に名前を入れていただいてありがとうございます. 閉包空間に「端点…

On the moduli spaces of multipolygonal linkages in the plane

Michael Holcomb Topology and its Applications Volume 154, Issue 1 , 1 January 2007, Pages 124-143 http://dx.doi.org/10.1016/j.topol.2006.04.003平面上のある2点を結ぶ3つのpolygonal linkage (「折れ尺」のようなもの) の配位空間のトポロジーを調…

Controlled generation of hard and easy Bayesian networks: Impact on maximal clique size in tree clustering

Ole J. Mengshoel, David C. Wilkins and Dan Roth Artificial Intelligence Volume 170, Issues 16-17 , November 2006, Pages 1137-1174 http://dx.doi.org/10.1016/j.artint.2006.09.003「ランダム」なベイジアン・ネットワークに対してHuginのアルゴリズ…

Improved bounds for the unsplittable flow problem

Petr Kolman and Christian Scheideler Journal of Algorithms Volume 61, Issue 1 , September 2006, Pages 20-44 http://dx.doi.org/10.1016/j.jalgor.2004.07.006SODA2004論文のジャーナル版.ようやく出た. Unsplittable flow problem (多品種流問題の0…

Compression-based fixed-parameter algorithms for feedback vertex set and edge bipartization

Jiong Guo, Jens Gramm, Falk Huffner, Rolf Niedermeier and Sebastian Wernicke Journal of Computer and System Sciences Volume 72, Issue 8 , December 2006, Pages 1386-1396 http://dx.doi.org/10.1016/j.jcss.2006.02.001WADS2005の論文. 「Iterati…

Complexity Zoo

http://qwiki.caltech.edu/wiki/Complexity_Zoo 専門家なら皆知っているページ.もちろんSNPもSUBEXPもFPTもW[1]も紹介されている. とても重宝する.

Strong computational lower bounds via parameterized complexity

Jianer Chen, Xiuzhen Huang, Iyad A. Kanj and Ge Xia Journal of Computer and System Sciences Volume 72, Issue 8 , December 2006, Pages 1346-1367 http://dx.doi.org/10.1016/j.jcss.2006.04.007STOC2004論文のジャーナル版. 次のような結果を示して…

A new characterization of the normal law

S.Y. Novak Statistics & Probability Letters Volume 77, Issue 1 , 1 January 2007, Pages 95-98 http://dx.doi.org/10.1016/j.spl.2006.05.020平均0,分散σ^2の正規分布に従う独立な確率変数X,Yに対して,2XY/\sqrt{X^2+Y^2}という確率変数も平均0,分散…

The visibility-Voronoi complex and its applications

Ron Wein, Jur P. van den Berg and Dan Halperin Computational Geometry Volume 36, Issue 1 , January 2007, Pages 66-87 http://dx.doi.org/10.1016/j.comgeo.2005.11.007SoCG2005の論文だけど,これはEWCG2005の特集号. 可視性グラフ(visibility graph…

Generating realistic terrains with higher-order Delaunay triangulations

Thierry de Kok, Marc van Kreveld and Maarten Loeffler Computational Geometry Volume 36, Issue 1 , January 2007, Pages 52-65 http://dx.doi.org/10.1016/j.comgeo.2005.09.005ESA2005の論文だけど,これはEWCG2005の特集号. 高階デローネ三角形分割…

How to get close to the median shape

Sariel Har-Peled Computational Geometry Volume 36, Issue 1 , January 2007, Pages 39-51 http://dx.doi.org/10.1016/j.comgeo.2006.02.003いわゆる「コアセット」(coreset) の論文. 例えば,与えられた複数の点からの距離の和を最小にするような球面を…

On the geometric dilation of closed curves, graphs, and point sets

Adrian Dumitrescu, Annette Ebbers-Baumann, Ansgar Grune, Rolf Klein and Gunter Rote Computational Geometry Volume 36, Issue 1, January 2007, Pages 16-38 http://dx.doi.org/10.1016/j.comgeo.2005.07.004 WADS2005の論文だけど,CGTAのこの号はEWC…

Abstract order type extension and new results on the rectilinear crossing number

Oswin Aichholzer, and Hannes Krasser Computational Geometry Volume 36, Issue 1, January 2007, Pages 2-15 http://dx.doi.org/10.1016/j.comgeo.2005.07.005SoCG2005の論文だけど,CGTAのこの号はEWCG2005の特集号. 彼らの作っている順序タイプ (order…

Algebraic Structures and Algorithms for Matching and Matroid Problems

Nicholas J. A. Harvey FOCS 2006 http://theory.lcs.mit.edu/~nickh/Publications/Publications.html日本好きとして一部で有名なHarveyの論文. グラフの最大マッチングを高速行列積計算を用いて求めるアルゴリズムが2004年にMucha and Sankowskiが提出した…

ブール行列積計算のアルゴリズム

もちろん,Coppersmith-Winogradのアルゴリズムを使えばオーダーnの2.376乗で計算できるが,これは実用的でないと考えられている. ということで,ちょっと考えたらO(n^3 / log n)という計算量のシンプルなアルゴリズムを思いついた. 「ふむ,これはなかな…

On combinatorial optimization problems on matroids with uncertain weights

Adam Kasperski and Pawel Zielinski European Journal of Operational Research Volume 177, Issue 2 , 1 March 2007, Pages 851-864 http://dx.doi.org/10.1016/j.ejor.2005.12.033マトロイドの最小重み基を求める問題を考えるが,要素の重みがある閉区間…

Location-routing: Issues, models and methods

Gabor Nagy and Said Salhi European Journal of Operational Research Volume 177, Issue 2 , 1 March 2007, Pages 649-672 http://dx.doi.org/10.1016/j.ejor.2006.04.004配置問題と配送計画問題を別々にしないアプローチに関するサーベイ. EJORはサーベ…

Indexing XML documents for XPath query processing in external memory

Qun Chen, Andrew Lim, Kian Win Ong and Jiqing Tang Data & Knowledge Engineering Volume 59, Issue 3, December 2006, Pages 681-699 http://dx.doi.org/10.1016/j.datak.2005.11.002XML文書へのXPath型質問は親子関係や先祖子孫関係だけではない. その…

NHC秋学校

NHC秋学校の演習の時間のグループ割当を整数計画問題にして,NEOS Serverで解かせた. 手元のGLPKではかなり時間がかかったけど,NEOSではすぐ解けた.

Minimal on-line labelling

Richard S. Bird, and Stefan Sadnicki Information Processing Letters Volume 101, Issue 1 , 16 January 2007, Pages 41-45 http://dx.doi.org/10.1016/j.ipl.2006.07.011N人が次々と順番にやって来るので,1列に並んだN個の席に順に座らせることを考える…

Linear-time algorithms for problems on planar graphs with fixed disk dimension

Faisal N. Abu-Khzam, and Michael A. Langston Information Processing Letters Volume 101, Issue 1, 16 January 2007, Pages 36-40 http://dx.doi.org/10.1016/j.ipl.2006.08.006ACiD2005論文のジャーナル版. Fellows and Langston (1988) の不思議な論…

Flows in dynamic networks with aggregate arc capacities

Vardges Melkonian Information Processing Letters Volume 101, Issue 1, 16 January 2007, Pages 30-35 http://dx.doi.org/10.1016/j.ipl.2006.07.007動的transshipment problemといえば,Hoppe and Tardos (2000) の結果が有名で,多項式時間で解けること…

An improved approximation ratio for the minimum linear arrangement problem

Uriel Feige and James R. Lee Information Processing Letters Volume 101, Issue 1, 16 January 2007, Pages 26-29 http://dx.doi.org/10.1016/j.ipl.2006.07.009グラフの最小linear arrangement問題に対する近似アルゴリズム。 Arora, Rao and Vazirani (…

Hardness results on the man-exchange stable marriage problem with short preference lists

Eric Mc Dermid, Christine Cheng, and Ichiro Suzuki Information Processing Letters Volume 101, Issue 1, 16 January 2007, Pages 13-19 http://dx.doi.org/10.1016/j.ipl.2006.07.005安定結婚問題に関する論文。 Irvingは最近「man-exchange stable mat…

R-Trees: Theory and Applications

R-Trees: Theory and Applications (Advanced Information and Knowledge Processing)作者: Yannis Manolopoulos,Alexandros Nanopoulos,Apostolos N. Papadopoulos,Yannis Theodoridis出版社/メーカー: Springer発売日: 2005/11/21メディア: ハードカバー …