冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个...冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个案例中提取14项评价指标,并建立了数据库。基于数量化理论评价法与模糊评价法,建立了适用性更强的TWF(theory of quantification with fuzzy evaluation)评价法,该方法继承了数量化理论和模糊评价法的优势,并将煤矿冲击危险程度划分为5个等级。以河南某煤矿工作面为背景,采用TWF冲击危险性评价模型对该工作面进行了冲击危险性评价,得出危险性指数为19.83,评价结果为无冲击危险性,与现场实际相符,表明该评价模型具有较强的适用性;开发了TWF综合评价系统,持续的案例补充可不断提高TWF评价模型的评价精度,研究成果可为冲击地压危险评价提供一定的理论参考。展开更多
Scarce resources,precedence and non-determined time-lag are three constraints commonly found in small and medium manufacturing enterprises(SMEs),which are deemed to block the application of workflow management system(...Scarce resources,precedence and non-determined time-lag are three constraints commonly found in small and medium manufacturing enterprises(SMEs),which are deemed to block the application of workflow management system(WfMS). To tackle this problem,a workflow scheduling approach is proposed based on timing workflow net(TWF-net) and genetic algorithm(GA). The workflow is modelled in a form of TWF-net in favour of process simulation and resource conflict checking. After simplifying and reconstructing the set of workflow instance,the conflict resolution problem is transformed into a resource-constrained project scheduling problem(RCPSP),which could be efficiently solved by a heuristic method,such as GA. Finally,problems of various sizes are utilized to test the performance of the proposed algorithm and to compare it with first-come-firstserved(FCFS) strategy. The evaluation demonstrates that the proposed method is an overwhelming and effective approach for scheduling the concurrent processes with precedence and resource constraints.展开更多
文摘冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个案例中提取14项评价指标,并建立了数据库。基于数量化理论评价法与模糊评价法,建立了适用性更强的TWF(theory of quantification with fuzzy evaluation)评价法,该方法继承了数量化理论和模糊评价法的优势,并将煤矿冲击危险程度划分为5个等级。以河南某煤矿工作面为背景,采用TWF冲击危险性评价模型对该工作面进行了冲击危险性评价,得出危险性指数为19.83,评价结果为无冲击危险性,与现场实际相符,表明该评价模型具有较强的适用性;开发了TWF综合评价系统,持续的案例补充可不断提高TWF评价模型的评价精度,研究成果可为冲击地压危险评价提供一定的理论参考。
基金Supported by the Postdoctoral Science Foundation of China(No.2015M572022)the National Natural Science Foundation of China(No.51175304)
文摘Scarce resources,precedence and non-determined time-lag are three constraints commonly found in small and medium manufacturing enterprises(SMEs),which are deemed to block the application of workflow management system(WfMS). To tackle this problem,a workflow scheduling approach is proposed based on timing workflow net(TWF-net) and genetic algorithm(GA). The workflow is modelled in a form of TWF-net in favour of process simulation and resource conflict checking. After simplifying and reconstructing the set of workflow instance,the conflict resolution problem is transformed into a resource-constrained project scheduling problem(RCPSP),which could be efficiently solved by a heuristic method,such as GA. Finally,problems of various sizes are utilized to test the performance of the proposed algorithm and to compare it with first-come-firstserved(FCFS) strategy. The evaluation demonstrates that the proposed method is an overwhelming and effective approach for scheduling the concurrent processes with precedence and resource constraints.
