this paper deals with the problem of user-server assignment in online social network systems. online social network applications such as facebook, twitter, or instagram are built on an infrastructure of servers that enables them to communicate with each other. a key factor that determines the facility of communication between the users and the servers is the expected transmission time (ett). a ...

Simulated annealing is an established method for global optimization. Perhaps its most salient feature is the statistical promise to deliver a globally optimal solution. In this work, we propose a technique which attempts to combine the robustness of annealing in rugged terrain with the efficiency of local optimization methods in simple search spaces. On a variety of benchmark functions, the pr...

The research presented here is a comparison of the scalability of the simulated annealing algorithm on a vector super computer (CRAY Y-MP) with the scalability of a parallel implementation on a massively parallel transputer surface (Parsytec GCel with 512 nodes of type T805). Some results of the annealing procedure applied to the crystallization of Lennard-Jones particles on a sphere are presen...

The approach of reverse engineering gene networks by fitting models has been highly successful, but increasing model complexity means that more powerful global optimisation techniques are required for model fitting; for this, we require faster parallel algorithms. I examine the modeling of the gap gene network in Drosophila, for which a gene network model, in the form of a set of differential e...

the urban waste collection is one of the major municipal activities that involves large expenditures and difficult operational problems. also, waste collection and disposal have high expenses such as investment cost (i.e. vehicles fleet) and high operational cost (i.e. fuel, maintenance). in fact, making slight improvements in this issue lead to a huge saving in municipal consumption. some inci...

task assignment problem (tap) involves assigning a number of tasks to a number of processors in distributed computing systems and its objective is to minimize the sum of the total execution and communication costs, subject to all of the resource constraints. tap is a combinatorial optimization problem and np-complete. this paper proposes a hybrid meta-heuristic algorithm for solving tap in a h...

this paper investigates the problem of selecting and scheduling a set of projects among available projects. each project consists of several tasks and to perform each one some resource is required. the objective is to maximize total benefit. the paper constructs a mathematical formulation in form of mixed integer linear programming model. three effective metaheuristics in form of the imperialis...