Reducing Symmetry in a Combinatorial Design Problem
نویسنده
چکیده
A combinatorial design problem is considered which can be modelled as a constraint satisfaction problem in several diierent ways. The models all have a large number of symmetries which cause diiculties when searching for solutions. Diierent approaches to reducing the symmetry are discussed: remodelling the problem ; adding constraints to the model at the outset; and adding constraints during search to prevent symmetric assignments being explored on backtracking. The most successful strategy for the problem of this paper employs a complex model with less inherent symmetry than the others, combined with symmetry breaking during search.
منابع مشابه
FORM FINDING FOR RECTILINEAR ORTHOGONAL BUILDINGS THROUGH CHARGED SYSTEM SEARCH ALGORITHM
Preliminary layout design of buildings has a substantial effect on the ultimate design of structural components and accordingly influences the construction cost. Exploring structurally efficient forms and shapes during the conceptual design stage of a project can also facilitate the optimum integrated design of buildings. This paper presents an automated method of determining column layout desi...
متن کاملHybrid Key pre-distribution scheme for wireless sensor network based on combinatorial design
Key distribution is an important problem in wireless sensor networks where sensor nodesare randomly scattered in adversarial environments.Due to the random deployment of sensors, a list of keys must be pre-distributed to each sensor node before deployment. To establish a secure communication, two nodes must share common key from their key-rings. Otherwise, they can find a key- path in which ens...
متن کاملSelecting Efficient Service-providers in Electric Power Distribution Industry Using Combinatorial Reverse Auction
In this paper, a combinatorial reverse auction mechanism is proposed for selecting the most efficient service-providers for resolving sustained power interruptions in multiple regions of an electric power distribution company’s responsibility area. Through this mechanism, supplying the required service in each region is assigned to only one potential service-provider considering two criteria in...
متن کاملA Hybrid Meta-heuristic for the Dynamic Layout Problem with Transportation System Design
This paper primarily presents a comprehensive dynamic layout design model which integrates layout and transportation system design via considering more realistic assumptions, such as taking account of fixed-position departments and distance between departments that endanger each other. In addition, specific criteria such as capacity, cost and reliability of facilities are considered in transpor...
متن کامل