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This paper studies the slab stack shuffling problem considering crane scheduling in the slab yard of iron and steel industries. An ILP-based algorithm framework is proposed for the problem, in which an ILP model is proposed to solve the slab selecting subproblem and a specified procedure is developed to detect whether there is a feasible crane schedule for the chosen slabs. Through a number of iterations,...
We considered an unreliable Geo/Geo/1 retrial queue with infinite-capacity orbit and normal queue. In this model it is assume that if the server subjected to starting failures and breakdown during services of a customer, the customer leaves the server, joins a retrial group and repeatedly attempts to access the server in random intervals to get service. We study the Markov chain underlying the considered...
In order to satisfy performance and long life requirements for hot forging die, Ni60-SiC cermet coating was prepared on the high speed steel W6M05Cr4V2 by plasma cladding technology. Metallurgical bonding coating with enough bonding strength was obtained after optimizing the cladding parameters. The clad coating composition, microstructure, microhardness and thermal physical parameters were analyzed...
As a new general-purpose heuristic algorithm, Ant Colony Optimization Algorithm(ACO) has been applied to combinatorial optimization problems. The main characteristics of ACO are positive feedback, distributed computation and the use of constructive greedy heuristic. This paper presents the principle and the hierarchy model of the ACO with small-perturbation. This algorithm is applied to the optimization...
The boiler's processing and assembling shop was taken as the reality physical model in this paper, from which the general job-shop production workshop was abstracted as the simplified model and the scheduling algorithms of job-shop production workshop was lucubrated. Firstly, the model of job-shop production workshop was established; secondly, the scheduling theory and algorithms of production workshop...
Aiming at forecasting failure time of the missile more accurately, saving the manpower, money and material resources, a data-fusion forecast model based on artificial neural network was put forward. First, several single forecasting methods including grey model, time series model and so on were used. Then, all of the single forecast results were fused by artificial neural network. The model was calculated...
For the control system with the hysteretic characteristics on temperature, the combination of PID and fuzzy control were put forward and a fuzzy self-adjusting PID controller for heater system was built, in which fuzzy control rules are used for PID parameters self-tuning. By simulation and compared with other ordinary PID controls, it's concluded that the method used in a hydraulic servo system can...
When we want to gain the weight of several influencing factors without sufficient data, we use the Analytic Hierarchy Process method. But sometimes this method may be a little inaccuracy, for the weights of the inner process are decided by manpower. This paper takes the background of food security to provide an improved Analytic Hierarchy Process method, which conduct the Analytic Hierarchy Process...
For urban water consumption characteristics of the process will be applied to the neural network model for forecasting urban water demand. Describes the process of feed-forward neural network model and the feedback process neural network model; study of weight function based on orthogonal basis started learning algorithm, and describes the specific steps of the algorithm; drawn flowchart of urban...
In this paper we will prove the complexity of three main problems in the context of autoepistemic logic. The first problem is the question if a set of premise sum has a stable expansion. The second is if a given formula exists in at least one stable expansion, this problem is also known as brave reasoning. The third is if a given formula exists in every stable expansion, also known as cautious reasoning...
Water reducing admixture (WRA) has become one indispensable part of modern high performance concrete, and how to choose the excellent performance, better quality and lower price WRA has become one important problem in engineering construction. The fuzzy comprehensive evaluation method is applied to resolve this problem in the paper. In connection with the four primary factors and twenty two secondary...
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