In this study an efficient meta-heuristic is proposed for layout optimization of truss structures by combining cellular automata (CA) and firefly algorithm (FA). In the proposed meta-heuristic, called here as cellular automata firefly algorithm (CAFA), a new equation is presented for position updating of fireflies based on the concept of CA. Two benchmark examples of truss structures are presen...

Abstract This paper studies some properties of the exploration problem with N vehicles, which consist a necessary condition for the optimal solution. Based on this condition, the authors design a heuristic algorithm, into which the greedy idea is introduced. The computational complexity of the algorithm is ) ( 4 n O . After that, by calculating 10 numerical examples selected from paper [4], we ...

with the rapid expansion of the information on the internet, recommender systems play an important role in terms of trade and research. recommender systems try to guess the user's way of thinking, using the in-formation of user's behavior or similar users and their views, to discover and then propose a product which is the most appropriate and closest product of user's interest. ...

We consider the problem of adding a fixed number of relays to a WSN in order to minimise the length of the longest transmission edge. Since routing subnetworks are often trees we model the problem as a Euclidean k-bottleneck Steiner tree problem (k-BSTP). We then propose a new iterative approximation algorithm for the k-BSTP, based on an exact solution to the 1-BSTP, and compare our heuristic (...

This paper investigates a hyper-heuristic algorithm for the permutation flow shop problem(FSP) to find a sequence to minimize the makespan. In comparison with existing approaches, our proposed hyper-heuristic algorithm based on multi-agent architecture includes two levels: low level heuristic agents(LLHAs) do local search in the solution domain and hyper-heuristic agent(HHA) manages low level h...

Many appealing multicast services such as on-demand TV, teleconference, online games and etc. can benefit from high available bandwidth in multi-radio multi-channel wireless mesh networks. When multiple simultaneous transmissions use a similar channel to transmit data packets, network performance degrades to a large extant. Designing a good multicast tree to route data packets could enhance the...

Systems structure optimization is a multi-objective or a combinatorial optimization problem, which should consider the comprehensive influence of cost, time and resource etc. This paper firstly describes the system structure optimization problem and gives the mathematical model. Then a heuristic optimization algorithm is proposed to analyze the execution time, the success rate and the cost in s...

This paper presents a tool for the visualization and simulation of automated stowage plan generation for large containership. The stowage plan is generated automatically based on a heuristic algorithm. The allocation algorithm generates different stowage plan in three main stages which includes basic allocation, special container allocation and various stages of stability adjustments. The purpo...

One of user's queries from navigation service is to find the nearest facility in terms of time. The facility that is being questioned by the user as a destination may have a queuing service system (e.g. bank), which means that the cost function of the shortest path includes the waiting time at the destination as well as the travel time. This research conducts in the zone 1 of Mashhad with Bank ...

In this paper, we propose a hierarchical optimization technique of the PCB assembly line including multi-head non-identical surface mounting machines. The optimization problem related to the PCB assembly line is generally divided into three sub-problems: a line balancing problem, a reel assignment problem and a pick-and-place sequencing problem. Since each problem is known to be combinatorial a...