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A hybrid ant algorithm for the airline crew pairing problem

Crawford B.; Castro C.; Morifroy E. (2014-04-04)

This article analyzes the performance of Ant Colony Optimization algorithms on the resolution of Crew Pairing Problem, one of the most critical processes in airline management operations. Furthermore, we explore the ...

A hybrid Ant algorithm for the set covering problem

Crawford B.; Soto R.; Monfroy E.; Paredes F.; Palma W. (2014-04-04)

Set covering problem is the model for many important industrial applications. In this paper, we solve some benchmarks of this problem with ant colony optimization algorithms using a new transition rule. A look-ahead mechanism ...

Hybrid approach to crew pairing optimization

Crawford B.; Rodriguez N.; Castro C.; Monfroy E. (2014-04-04)

In order to be able to solve any combinatorial optimization problem It seems that a good idea is to use both Incomplete and complete techniques together. When problems are easy enough to allow searching for the optimal ...

A hybrid approach using an Artificial Bee algorithm with mixed integer programming applied to a large-scale capacitated facility location problem

Cabrera G. G.; Cabrera E.; Soto R.; Rubio L.J.M.; Crawford B.; Paredes F. (2014-04-04)

We present a hybridization of two different approaches applied to the well-known Capacitated Facility Location Problem (CFLP). The Artificial Bee algorithm (BA) is used to select a promising subset of locations (warehouses) ...

A hybrid metaheuristic approach to optimize the districting design of a parcel company

Gonzalez-Ramirez R.G.; Smith N.R.; Askin R.G.; Miranda P.A.; Sanchez J.M. (2014-04-04)

In this article we address a districting problem faced by a pickup and delivery parcel company over a determined service region. The service region is divided into districts, each served by a single vehicle that departs ...

A hybrid particle swarm optimization - simulated annealing algorithm for the probabilistic travelling salesman problem

Guillermo Cabrera G.; Silvana Roncagliolo D.; Riquelme J.P.; Cubillos C.; Soto R. (2014-04-04)

The Probabilistic Traveling Salesman Problem (PTSP) is a variation of the well known Traveling Salesman Problem (TSP). This problem arises when the information about customers demand is not available at the moment of the ...

A hybrid soft computing approach for subset problems

Crawford B.; Soto R.; Monfroy E.; Castro C.; Palma W.; Paredes F. (2014-04-04)

Subset problems (set partitioning, packing, and covering) are formal models for many practical optimization problems. A set partitioning problem determines how the items in one set (S) can be partitioned into smaller ...

Hybrid strategies of enumeration in constraint solving

Monfroy E.; Crawford B.; Soto R.; Paredes F. (2014-04-04)

Enumeration strategies (that is, selection of a variable and a value of its domain) are crucial components of Constraint Programming: they significantly influence the performances of the solving process, sometimes of several ...

Hybrid strategies of enumeration in constraint solving

Monfroy E.; Crawford B.; Soto R.; Paredes F. (2014-04-05)

Enumeration strategies (that is, selection of a variable and a value of its domain) are crucial components of Constraint Programming: they significantly influence the performances of the solving process, sometimes of several ...

Hybrid wavelet-RBFNN model for monthly anchovy catches forecasting

Rodriguez N.; Crawford B.; Castro C.; Yanez E. (2014-04-04)

A hybrid method to forecast 1-month ahead monthly anchovy catches in the north area of Chile is proposed in this paper. This method combined two techniques, stationary wavelet transform (SWT) and radial basis function ...

Hybridization of PSO and a discrete position update scheme techniques for manufacturing cell design

Duran O.; Rodriguez N.; Consalter L.A. (2014-04-04)

This paper proposes an hybrid algorithm for Manufacturing Cell Formation. The two techniques that are combined to address this problem correspond to Particle Swarm Optimization (PSO) and a Data Mining Clustering application. ...

Hydromedusae (Cnidaria) of the Chilean southern channels (from the Corcovado Gulf to the Pulluche-Chacabuco channels)

Palma S.; Apablaza P.; Silva N. (2014-04-04)

Hydromedusae collected in epipelagic waters of the channels in southern Chile, between the Corcovado Gulf and the Pulluche-Chacabuco channels, were analysed. A total of 23 species were identified and recorded for the first ...

Hyperbaric oxygen therapy in a patient with autosomal dominant polycystic kidney disease with a perinephritic abscess

Vega J.; Goecke H.; Manriquez F.; Escobar C.; Escobar M.; Videla C.; Santamarina M.; Echeverria C.; Guarda F.J. (2014-04-04)

A 68-year-old female in hemodialysis due to autosomal dominant polycystic kidney disease underwent resection of cysts in her right kidney via a laparoscopic approach due to abdominal pain. Three weeks after surgery, she ...

Hypercube framework for ACO applied to timetabling

Johnson F.; Crawford B.; Palma W. (2014-04-04)

We present a resolution technique of the University course Timetabling problem (UCTP), this technique is based in the implementation of Hypercube framework using the Max-Min Ant System. We presented the structure of the ...

A hyperheuristic approach for constraint solving

Crawford B.; Castro C.; Monfroy E. (2014-04-04)

In this work we propose a Choice Function for guiding Constraint Programming in the resolution of Constraint Satisfaction Problems. We exploit some search process features to select on the fly the Enumeration Strategy ...

A hyperheuristic approach for guiding enumeration in constraint solving

Crawford B.; Castro C.; Monfroy E.; Soto R.; Palma W.; Paredes F. (2014-04-04)

In this paper we design and evaluate a dynamic selection mechanism of enumeration strategies based on the information of the solving process. Unlike previous research works we focus in reacting on the fly, allowing an early ...

A hyperheuristic approach to select enumeration strategies in constraint programming

Crawford B.; Montecinos M.; Castro C.; Monfroy E. (2014-04-04)

This work is focused on the Enumeration phase of Constraint Programming to solve Constraint Satisfaction Problems, an enumeration strategy is constituted by a variable selection heuristic and a value selection heuristic. ...

Hypoxia-related lipid peroxidation: Evidences, implications and approaches

Behn C.; Araneda O.F.; Llanos A.J.; Celedon G.; Gonzalez G. (2014-04-04)

Hypoxia may be intensified by concurrent oxidative stress. Lack of oxygen in relation to aerobic ATP requirements, as hypoxia has been defined, goes along with an increased generation of reactive oxygen species (ROS). ...

Hypoxia-related lipid peroxidation: Evidences, implications and approaches

Behn C.; Araneda O.F.; Llanos A.J.; Celedon G.; Gonzalez G. (2014-04-05)

Hypoxia may be intensified by concurrent oxidative stress. Lack of oxygen in relation to aerobic ATP requirements, as hypoxia has been defined, goes along with an increased generation of reactive oxygen species (ROS). ...

The hypoxic testicle: Physiology and pathophysiology

Reyes J.G.; Farias J.G.; Henriquez-Olavarrieta S.; Madrid E.; Parraga M.; Zepeda A.B.; Moreno R.D. (2014-04-04)

Mammalian spermatogenesis is a complex biological process occurring in the seminiferous tubules in the testis. This process represents a delicate balance between cell proliferation, differentiation, and apoptosis. In most ...

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