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In the process of image restoration, the denoising is an important step. Several models of non-linear diffusive filters requiring solving partial differential equations have been proposed in the literature [1], [2], [3], [4], [5], [6], [7] during the last decades. The existence and uniqueness of a solution in Hilbert space has been established under suitable conditions on the filtering function for...
In this work, a memetic algorithm that makes use of the multilevel paradigm for solving SAT problems is presented. The multilevel paradigm refers to the process of dividing large and difficult problems into smaller ones, which are hopefully much easier to solve, and then work backward towards the solution of the original problem, using a solution from a previous level as a starting solution at the...
Distributing N charged particles informally over the surface of a unit sphere is an old and largely unsolved problem, it is generally known as the Thomson problem and it is solved by finding the lowest energy configuration that minimizes the electrostatic energy of the system. The energy function is everywhere infinitely differentiable and has an exponential number of local minimizers that grows exponentially...
The rate of climate change has been speeding up with the increase of greenhouse gas emissions, and this has been a growing concern as most of them are results of human activities. In this paper we will present a mathematical formulation of oil refinery with the consideration of effects of greenhouse gas emissions. In this paper the model developed will consider two major pollutants CO2 and SO2. Taking...
In this paper, we present two General Variable Neighborhood Search for the Traveling Salesman Problem with Draft Limits (TSPDL), a recent variant of the Traveling Salesman Problem. TSPDL arises in the context of maritime transportation. It consists of finding optimal Hamiltonian tour for a given ship which has to visit and deliver products to a set of ports while respecting the draft limit constraints...
In this paper we propose a two-phase solution approach to solve a combined routing and scheduling problem occurring in the textile industry where all fabrics are dyed by dye-jets and transported by forklifts. The objective is to minimize the cost of unproductive activities consisting of setup time due to dye-jets cleaning and forklifts waiting time. The first phase solves an integer linear program...
In this paper, we study the problem of scheduling n jobs without preemption on a machine subject to random failures. To illustrate the performance of the proposed strategy, we consider the production sequence as non-fixed. The machine undergoes minimal repair whenever it fails. To minimize the makespan (Cmax), that is to say, the total length of the schedule, a joint management of the production and...
In this paper, we present a new hybrid method of optimization by the heuristics algorithms to evaluate the reliability of the electronic card by simulating its thermo-mechanical behavior. A model of simulation by finite element is developed to consider the maximal deformations due to the temperature; a mechanico-computing coupling is used to find the optimal structure. Embedded electronic systems...
Increasing gasoline and propylene production from Fluid Catalytic Cracking Dnits (FCCDs) has been widely discussed over the past few years. Today, one of the main industrial challenges is how to balance the design and operation of FCCU between maximum gasoline and propylene production. With market demands and prices of both products fluctuating, it is desirable to operate the unit at optimal operating...
In this paper, age replacement policies for two-component parallel system with stochastic dependence are investigated. The stochastic dependence considered, is modeled by a one-sided domino effect. The failure of component 1 at instant t may induce the failure of component 2 at instant t+ τ with a given probability. The time delay is a random variable with known probability density function. The system...
Interoperability of the rail system within Europe is a key to its competitiveness. It aims at creating a rail network allowing a transport that is safe, compliant with the required performance level of the lines, and which does not necessitate train transfers. This requires the compliance with a set of rules, of technical and operational conditions which ensure that all the safety requirements are...
The rapid increment of the population and the consummation of energy in the world as well as the depletion of fossil resources generated a significant increment in the prices of natural resources such as petrol and natural gaz. This elevation led to the use of hybrid electrical systems. The use of these multi sources systems progressed a lot in different industrial sectors. Between all sources of...
RFCC is an economically important process in refinery that involves complex interactions between yields and operating conditions. This paper will focus on the use of catalyst in order to maximize profits while accounting for CO2 emissions. Based on a literature review a conceptual model is proposed and three scenarios for increasing profits are proposed: i) decreasing the catalyst to oil ratio, ii)...
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