Institution
Bu-Ali Sina University
Education•Hamadan, Hamadān, Iran•
About: Bu-Ali Sina University is a education organization based out in Hamadan, Hamadān, Iran. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 4078 authors who have published 7969 publications receiving 122828 citations.
Topics: Catalysis, Adsorption, Cyclic voltammetry, Ionic liquid, Schiff base
Papers published on a yearly basis
Papers
More filters
•
TL;DR: In this paper, the traveling salesman problem (TSP) is solved using reinforcement learning and a recurrent network that predicts a distribution over different city permutations using negative tour length as the reward signal.
Abstract: This paper presents a framework to tackle combinatorial optimization problems using neural networks and reinforcement learning. We focus on the traveling salesman problem (TSP) and train a recurrent network that, given a set of city coordinates, predicts a distribution over different city permutations. Using negative tour length as the reward signal, we optimize the parameters of the recurrent network using a policy gradient method. We compare learning the network parameters on a set of training graphs against learning them on individual test graphs. Despite the computational expense, without much engineering and heuristic designing, Neural Combinatorial Optimization achieves close to optimal results on 2D Euclidean graphs with up to 100 nodes. Applied to the KnapSack, another NP-hard problem, the same method obtains optimal solutions for instances with up to 200 items.
327 citations
••
TL;DR: A mathematical model and heuristic approaches for flexible job shop scheduling problems (FJSP) are considered and it is concluded that the hierarchical algorithms have better performance than integrated algorithms and the algorithm which use tabu search and simulated annealing heuristics for assignment and sequencing problems consecutively is more suitable than the other algorithms.
Abstract: Scheduling for the flexible job shop is very important in both fields of production management and combinatorial optimization. However, it is quite difficult to achieve an optimal solution to this problem in medium and actual size problem with traditional optimization approaches owing to the high computational complexity. For solving the realistic case with more than two jobs, two types of approaches have been used: hierarchical approaches and integrated approaches. In hierarchical approaches assignment of operations to machines and the sequencing of operations on the resources or machines are treated separately, i.e., assignment and sequencing are considered independently, where in integrated approaches, assignment and sequencing are not differentiated. In this paper, a mathematical model and heuristic approaches for flexible job shop scheduling problems (FJSP) are considered. Mathematical model is used to achieve optimal solution for small size problems. Since FJSP is NP-hard problem, two heuristics approaches involve of integrated and hierarchical approaches are developed to solve the real size problems. Six different hybrid searching structures depending on used searching approach and heuristics are presented in this paper. Numerical experiments are used to evaluate the performance of the developed algorithms. It is concluded that, the hierarchical algorithms have better performance than integrated algorithms and the algorithm which use tabu search and simulated annealing heuristics for assignment and sequencing problems consecutively is more suitable than the other algorithms. Also the numerical experiments validate the quality of the proposed algorithms.
318 citations
••
TL;DR: Silica sulfuric acid as discussed by the authors can be used to catalyse the Biginelli reaction between an aldehyde, a β-dicarbonyl compound and urea or thiourea in refluxing ethanol.
304 citations
••
TL;DR: An efficient and cost-effective method for the preconcentration of trace amounts of Pb(II), Cd( II) and Cu(II) in environmental and biological samples using this novel magnetic solid phase is developed and satisfactory results were obtained.
299 citations
••
TL;DR: In this article, the trends of the annual maximum (Tmax), minimum (Tmin) and mean (Tmean) air temperatures and precipitation (P) time series were examined in the west, south and southwest of Iran for the period 1966-2005.
295 citations
Authors
Showing all 4110 results
Name | H-index | Papers | Citations |
---|---|---|---|
Ali Mohammadi | 106 | 1149 | 54596 |
Michael D. Ward | 95 | 823 | 36892 |
Rafael Luque | 80 | 693 | 28395 |
Mohammad Mehdi Rashidi | 73 | 379 | 15715 |
Domenico Otranto | 68 | 634 | 18523 |
Mahmoud Nasrollahzadeh | 64 | 314 | 10585 |
Mohammad Hossein Ahmadi | 60 | 477 | 11659 |
Mohammad Ali Zolfigol | 56 | 765 | 14878 |
Abbas Afkhami | 54 | 360 | 11928 |
Harry Adams | 54 | 557 | 12696 |
Hojat Veisi | 53 | 282 | 7329 |
Nasser Iranpoor | 51 | 372 | 8052 |
Mohammad Norouzi | 51 | 159 | 18934 |
Ali Akbar Saboury | 48 | 522 | 11098 |
Shadpour Mallakpour | 48 | 872 | 14432 |