LAGOS'09 Preliminary Program
Place: November 3-7, 2009 - Hotel Serra Azul, Gramado, Brazil

    The list of accepted papers is available.
   
Tuesday, Nov 3
16:45 Registration
20:00 Opening cocktail
Wednesday, Nov 4
8:00 - 8:30 Registration
8:30 - 8:45 Opening
8:45 - 9:35 Technical session 1 (4 papers)
TS 1a - Graph theory and algorithms
8:45 - 9:10 Degree sequence of tight distance graphs (J. Zamora, M. Matamala)
9:10 - 9:35 Polynomial-time recognition of uniform co-circuit graphs (K. Knauer)
TS 1b - Polyhedral combinatorics
8:45 - 9:10 A polyhedral study of the acyclic coloring problem (M. Braga, J. Marenco)
10:10 - 10:35 Strength of facets for the set covering and set packing polyhedra on circulant matrices (S. M. Bianchi, M. Escalante, M. S. Montelar)
9:35 - 10:00 Coffee break
10:00 - 11:00 Invited talk 1: M. C. Golumbic
11:00 - 12:15 Technical session 2 (6 papers)
TS 2a - Graph Theory
11:00 - 11:25 On minimal forbidden subgraph characterizations of balanced graphs (F. Bonomo, G. Durán, M. Safe, A. Wagler)
11:25 - 11:50 Distance-Hereditary Comparability Graphs (G. Di Stefano)
11:50 - 12:15 Graph tansformations preserving the stability number (B. Leveque, D. de Werra)
TS 2b - Combinatorial optimization
11:00 - 11:25 A branch&cut algorithm for the maximum common edge subgraph problem (G. Manic, C. C. Souza, L. Bahiense)
11:25 - 11:50 A branch-and-cut algorithm for equitable coloring based on a formulation by representatives (L. Bahiense, Y. Frota, N. Maculan, T. Noronha, C. Ribeiro)
11:50 - 12:15 A branch-and-cut-and-price approach for the capacitated m-ring-star problem (C. C. Souza, E. Hoshino)
12:15 - 14:00 Lunch
14:00 - 15:00 Invited talk 2: D. Williamson
15:00 - 16:15 Technical session 3 (6 papers)
TS 3a - Graph theory
15:00 - 15:25 Minimal vertex separators and new characterizations for dually chordal graphs (M. Gutierrez, P. De Caria)
15:25 - 15:50 On L(2,1)-coloring split, chordal bipartite and weakly chordal graphs (M. Cerioli, D. Posner)
15:50 - 16:15 b-chromatic number of cacti (A. Silva, V. Campos, C. Linhares Sales, F. Maffray)
TS 3b - Polyhedral combinatorics and combinatorial optimization
15:00 - 15:25 On the dominating set polytope of web graphs (S. M. Bianchi, G. Nasini, P. Tolomei) (Universidad Nacional de Rosario - CONICET)
15:25 - 15:50 A polyhedral study of the maximum edge subgraph problem (F. Bonomo, J. Marenco, D. Saban, N. Stier-Moses)
15:50 - 16:15 A Set Partitioning Approach to Shunting (C. Cardonha)
16:15 - 16:45 Coffee break
16:45 - 18:00 Technical session 4 (6 papers)
TS 4a - Graph Theory
16:45 - 17:10 On the Pfaffian number of graphs (A. A. Miranda, C. L. Lucchesi)
17:10 - 17:35 Impartial solitaire clobber played on powers of paths (T. Para, S. Gravier, S. Dantas)
17:35 - 18:00 On the metric dimension of infinite graphs (I. Pelayo, J. Cáceres, C. Hernando, M. Mora, M. Puertas)
TS 4b - Algorithms
16:45 - 17:10 Convergence Time to Nash Equilibrium in Selfish Bin Packing (A. Vignatti, F. Miyazawa)
17:10 - 17:35 Note on strong refutation algorithms for random k-SAT formulas (H. Han, Y. Person, M. Schacht)
17:35 - 18:00 Intersection Dimension and Maximum Degree (A. Natarajan, C. Subramanian)
Thursday, Nov 5
8:45 - 9:35 Technical session 5 (4 papers)
TS 5a - Graph theory
8:45 - 9:10 On the clique behavior of circulants with three small jumps (F. Larrión, M. Pizaña, R. Villarroel-Flores)
9:10 - 9:35 The number of convergent graphs under the biclique operator with no twin vertices is finite (L. Montero, M. Groshaus)
TS 5b - Combinatorics and graph theory
8:45 - 9:10 Invariant sets under permutation, extremal graphs, and covering codes (E. Monte Carmelo)
9:10 - 9:35 A note on permutation regularity (R. Sampaio, C. Hoppen, Y. Kohayakawa)
9:35 - 10:00 Coffee break
10:00 - 11:00 Invited talk 3: Pavol Hell
11:00 - 12:15 Technical session 6 (6 papers)
TS 6a - Algorithms and data structures
11:00 - 11:25 Boltzmann sampling of ordered structures (O. Roussel, M. Soria)
11:25 - 11:50 A concurrent implementation of skip graphs (H. Mendes, C. Fernandes)
11:50 - 12:15 Mixed Binary Euclid Algorithm (S. M. Sedjelmaci)
TS 6b - Graph theory and algorithms
11:00 - 11:25 Minimal separators in P_4-tidy graphs (V. Pedrotti, C. P. de Mello)
11:25 - 11:50 Minimum sum coloring of P_4-sparse graphs (F. Bonomo, M. Valencia-Pabon)
11:50 - 12:15 Grundy number on P_4-classes (J. C. Araújo, C. Linhares Sales)
12:15 Lunch
14:00 Social activity
Friday, Nov 6
8:45 - 9:35 Technical session 7 (4 papers)
TS 7a - Graph Theory
8:45 - 9:10 Maximizing the algebraic connectivity for a subclass of caterpillars (O. Rojo, L. Medina, N. Abreu, C. Justel)
9:10 - 9:35 On Q-spectral integral variation (M. Aguieiras, R. Del-Vecchio, S. Kirkland, N. Abreu)
TS 7b - Operations research
8:45 - 9:10 The minimum cost hop-and-root constrained forest in wireless sensor networks (C. Bechelane, A. Cunha, G. R. Mateus)
9:10 - 9:35 Optimization throughput, service rate, and buffer allocation in finite queueing networks (F. Cruz)
9:35 - 10:00 Coffee break
10:00 - 11:00 Invited talk 4: Celina Figueiredo
11:00 - 12:15 Technical session 8 (6 papers)
TS 8a - Graph theory and complexity
11:00 - 11:25 Skew partition sandwich problem is NP-complete (R. Teixeira, S. Dantas, C. Figueiredo)
11:25 - 11:50 Good edge-labelling of graphs (J. C. Araújo, N. Cohen, F. Giroire, F. Havet)
11:50 - 12:15 On coloring problems with local constraints (F. Bonomo, Y. Faenza, G. Oriolo)
TS 8b - Graph theory
11:00 - 11:25 On the basis graph of a bicolored matroid (A. P. Figueroa, E. Rivera-Campo)
11:25 - 11:50 The chromatic number of random lifts of K_5\e (D. O. Theis, B. Farzad)
11:50 - 12:15 The exact weighted independent set problem in perfect graphs and related classes (M. Milanic, J. Monnot)
12:15 - 14:00 Lunch
14:00 - 15:00 Invited talk 5: R. Sedgewick
15:00 - 16:15 Technical session 9 (6 papers)
TS 9a - Graph algorithms
15:00 - 15:25 Cycle transversals in bounded degree graphs (M. Groshaus, P. Hell, S. Klein, L. T. Nogueira, F. Protti)
15:25 - 15:50 Clique-coloring circular-arc graphs (M. Cerioli, A. Korenchendler)
15:50 - 16:15 On the polynomial time computability of the circular chromatic number for some superclasses of perfect graphs (A. Pecher, A. Wagler)
TS 9b - Combinatorial optimization
15:00 - 15:25 Upper and lower bounding procedures for the minimum caterpillar spanning problem (Y. Frota, L. Simonetti, C. C. Souza)
15:25 - 15:50 The Chvatal closure of generalized stable sets in bidirected graphs (M. Campelo, G. Cornuéjols)
15:50 - 16:15 Exact algorithms for a selective Vehicle Routing Problem where the longest route is minimized (C. Arbex, A. Cunha, G. R. Mateus, L. Martinez)
16:15 - 16:45 Coffee break
16:45 - 18:00 Poster session
Limited $r$-modular and finite $k$-Cayley trees (R. C. Andrade, G. Mota, P. C. L. Silva)
Edge-colouring subject to local restrictions (R. Machado, C. Figueiredo)
(k, l)-P_4-sparse graphs (R. Bravo, S. Klein, L. T. Nogueira, F. Protti)
Determining protein structures using the discretizable molecular distance geometry problem (S. Sallaume, S. martins, L. S. Ochi, W. Gramacho, C. Lavor)
Hardness results for the gapped consectutive-ones property problem (C. Chauve, J. Manuch, M. Patterson)
Mathematical programming and software debugging (L. Liberti, S. Le Roux, J. Leconte, F. Marinelli)
$2K_2$-partition of some classes of graphs (A. Silva, S. Dantas, F. Maffray)
Partial characterizations of circle graphs (F. Bonomo, G. Durán, L. Grippo, M. Safe)
Min-max priority queue with removal in worst case constant time (V. Campos, R. Corrêa)
Counting unlabeled k-path graphs (P. R. C. Pereira, A. Garcia, L. Markenzon)
A new encoding for the protein structure prediction problem in lattices (L. Pedro, H. Barbosa, E. Wanner, R. Silva)
Revenue maximization in public transport (R. Borndörfer, M. Neumann)
20:30 Conference dinner
Saturday, Nov 7
8:45 - 9:35 Technical session 10 (4 papers)
TS 10a - Enumerative combinatorics
8:45 - 9:10 Generating all the Steiner trees and computing Steiner intervals for a fixed number of terminals (M. Dourado, R. Oliveira, F. Protti)
9:10 - 9:35 Gaps in discrete random samples: extended abstract (P. Hitczenko)
TS 10b - Graph theory and algorithms
8:45 - 9:10 All pairs 2-route flows and varying capacities (M. Diallo, S. Gueye, P. Berthome)
9:10 - 9:35 On s-t paths and trails in edge-colored graphs (L. Gourvès, A. Lyra, C. A. Martinhon, J. Monnot, F. Protti)
9:35 - 10:00 Coffee break
10:00 - 11:00 Invited talk 6: R. Jamison
11:00 - 12:15 Technical session 11 (6 papers)
TS 11a - Graph theory and algorithms
11:00 - 11:25 Acyclic vertex coloring of graphs of maximum degree 6 (S. Varagani, K. Yadav, K. Kothapalli, V. Vadlamudi)
11:25 - 11:50 Short models for unit interval graphs (Min-Chih Lin, F. Soulignac, J. L. Szwarcfiter)
11:50 - 12:15 B-coloring of m-tight graphs (L. Sampaio, C. Linhares Sales)
TS 11b - Graph Theory
11:00 - 11:25 Almost spanning subgraphs of random graphs after adversarial edge removal (J. Boettcher, Y. Kohayakawa, A. Taraz)
11:25 - 11:50 A characterization of graphs with fractional total chromatic number equal to Delta + 2 (T. Ito, W. Kennedy, B. Reed)
11:50 - 12:15 Properties of an approximability-related parameter on circular complete graphs (R. Engström, T. Färnqvist, P. Jonsson, J. Thapper)
12:15 Closing