Browsing by Subject "Response surface"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Open Access A local search heuristic with self-tuning parameter for permutation flow-shop scheduling problem(IEEE, 2009) Dengiz, B.; Alabaş-Uslu, Ç.; Sabuncuoğlu, İhsanIn this paper, a new local search metaheuristic is proposed for the permutation flow-shop scheduling problem. In general, metaheuristics are widely used to solve this problem due to its NP-completeness. Although these heuristics are quite effective to solve the problem, they suffer from the need to optimize parameters. The proposed heuristic, named STLS, has a single self-tuning parameter which is calculated and updated dynamically based on both the response surface information of the problem field and the performance measure of the method throughout the search process. Especially, application simplicity of the algorithm is attractive for the users. Results of the experimental study show that STLS generates high quality solutions and outperforms the basic tabu search, simulated annealing, and record-to-record travel algorithms which are well-known local search based metaheuristics.Item Open Access Response surface optimization of the cultivation conditions and medium composition a novel probiotic strain Bacillus pumilus STF26(Universiti Putra Malaysia, 2014) Han, D.; San, N. O.; Angun, P.; Onarman Umu, O. C.; Demirci, A.; Tekinay, T.Probiotics have been widely used in aquaculture as a controlling disease, enhancing immune responses, providing nutrients, and improving water quality. The use of Bacillus species as probiotics is expanding rapidly with increasing number of studies. Optimization of cultivation conditions and the medium composition for the improvement of novel potential probiotic strain Bacillus pumilus STF26 was performed by using response surface methodology (RSM). Factors optimized were temperature, pH and the concentrations of dextrose, yeast extract, KH2PO4 and MgSO4.7H2O. The optimum values are found as 30.9°C, 6.9, 20% (w/v), for temperature, pH and the concentrations of dextrose and 1.526% (w/v), 0.1% (w/v) and 0.5% (w/v), for yeast extract, KH2PO4 and MgSO4.7H2O, respectively. As a result, maximum biomass at optimum conditions was 10.42 g/L, which is nearly 2.5 times higher when compared to the one obtained by using Luria Broth medium at optimized temperature and pH values. © All Rights Reserved.