A novel rule-based model for multi-stage multi-product scheduling problem(MMSP)in batch plants with parallel units is proposed.The scheduling problem is decomposed into two sub-problems of order assignment and order s...A novel rule-based model for multi-stage multi-product scheduling problem(MMSP)in batch plants with parallel units is proposed.The scheduling problem is decomposed into two sub-problems of order assignment and order sequencing.Firstly,hierarchical scheduling strategy is presented for solving the former sub-problem,where the multi-stage multi-product batch process is divided into multiple sequentially connected single process stages,and then the production of orders are arranged in each single stage by using forward order assignment strategy and backward order assignment strategy respectively according to the feature of scheduling objective.Line-up competition algorithm(LCA)is presented to find out optimal order sequence and order assignment rule,which can minimize total flow time or maximize total weighted process time.Computational results show that the proposed approach can obtain better solutions than those of the literature for all scheduling problems with more than 10 orders.Moreover,with the problem size increasing,the solutions obtained by the proposed approach are improved remarkably.The proposed approach has the potential to solve large size MMSP.展开更多
In recent years, British government regards vocational education as an important factor in enhancing national competitiveness, and has taken significant initiatives and reform efforts, which formed its own distinctive...In recent years, British government regards vocational education as an important factor in enhancing national competitiveness, and has taken significant initiatives and reform efforts, which formed its own distinctive characteristics of vocational education. UK vocational education administration experienced a process from germination to maturity, in the process, it formed a complete management system, and its overall management of education and employment, the creation of specialized management agencies to implement hierarchical management experience is worthy of learning.展开更多
基金Supported by the National Natural Science Foundation of China(21376185)
文摘A novel rule-based model for multi-stage multi-product scheduling problem(MMSP)in batch plants with parallel units is proposed.The scheduling problem is decomposed into two sub-problems of order assignment and order sequencing.Firstly,hierarchical scheduling strategy is presented for solving the former sub-problem,where the multi-stage multi-product batch process is divided into multiple sequentially connected single process stages,and then the production of orders are arranged in each single stage by using forward order assignment strategy and backward order assignment strategy respectively according to the feature of scheduling objective.Line-up competition algorithm(LCA)is presented to find out optimal order sequence and order assignment rule,which can minimize total flow time or maximize total weighted process time.Computational results show that the proposed approach can obtain better solutions than those of the literature for all scheduling problems with more than 10 orders.Moreover,with the problem size increasing,the solutions obtained by the proposed approach are improved remarkably.The proposed approach has the potential to solve large size MMSP.
文摘In recent years, British government regards vocational education as an important factor in enhancing national competitiveness, and has taken significant initiatives and reform efforts, which formed its own distinctive characteristics of vocational education. UK vocational education administration experienced a process from germination to maturity, in the process, it formed a complete management system, and its overall management of education and employment, the creation of specialized management agencies to implement hierarchical management experience is worthy of learning.
