A novel extension diagnosis method was proposed for enhancing the diagnosis ability of the conventional dissolved gas analysis. Based on the extension theory a matter-element model was established for qualitatively an...A novel extension diagnosis method was proposed for enhancing the diagnosis ability of the conventional dissolved gas analysis. Based on the extension theory a matter-element model was established for qualitatively and quantitatively describing the fault diagnosis problem of power transformers. The degree of relation based on the dependent functions was employed to determine the nature and the grade of the faults in a transformer system. And the proposed method was verified with the experimental data. The results show that accuracy rate of the diagnosis method exceeds 90% and two kinds of faults can be detected at the same time.展开更多
矿山综合能源系统(mine integrated energy system,MIES)作为支撑煤矿绿色发展的重要途径,合理有效地对其运行效益进行评价是促进其发展的必要前提。然而,MIES运行效益评价一方面需要考虑能-煤流的强耦合关系,另一方面还需要应对系统运...矿山综合能源系统(mine integrated energy system,MIES)作为支撑煤矿绿色发展的重要途径,合理有效地对其运行效益进行评价是促进其发展的必要前提。然而,MIES运行效益评价一方面需要考虑能-煤流的强耦合关系,另一方面还需要应对系统运行不确定性对于评价结果准确性的影响,鉴于此,提出一种基于最优聚类系数的改进可拓灰云模型(optimal clustering coefficient based improved extension gray cloud,OCC-IEGC)的MIES运行效益评价框架。首先,考虑MIES生态特性,基于驱动力-压力-状态-影响-响应(driving-pressure-state-impact-response,DPSIR)模型建立MIES运行效益评价指标体系,并应用云雾化权重筛选方法获得具有最优合理性的组合权重。其次,构建基于可拓灰云的MIES运行效益评价模型,削弱系统运行不确定性及评价过程中的主观性和模糊性对评价结果的影响,并采用最优灰云聚类系数提高评价结果的可靠性。最后,通过算例验证所提指标体系和评价模型的有效性。展开更多
为解决软件组织在软件项目开发过程中难以实施CMMI(capability maturity model integration)过程改进的问题,基于模型驱动架构的思想和技术,提出了一种"裁剪+重型扩展+轻型扩展"的元模型建模策略。给出了该建模策略下的具体...为解决软件组织在软件项目开发过程中难以实施CMMI(capability maturity model integration)过程改进的问题,基于模型驱动架构的思想和技术,提出了一种"裁剪+重型扩展+轻型扩展"的元模型建模策略。给出了该建模策略下的具体实施步骤和方法,实现了一种支持CMMI过程改进的软件过程元建模,同时给出了基于该元模型的建模实例。实验结果表明,该元模型有助于软件组织建立体现其组织特征并有效支持符合CMMI框架的软件过程用户模型。展开更多
文摘A novel extension diagnosis method was proposed for enhancing the diagnosis ability of the conventional dissolved gas analysis. Based on the extension theory a matter-element model was established for qualitatively and quantitatively describing the fault diagnosis problem of power transformers. The degree of relation based on the dependent functions was employed to determine the nature and the grade of the faults in a transformer system. And the proposed method was verified with the experimental data. The results show that accuracy rate of the diagnosis method exceeds 90% and two kinds of faults can be detected at the same time.
文摘为解决软件组织在软件项目开发过程中难以实施CMMI(capability maturity model integration)过程改进的问题,基于模型驱动架构的思想和技术,提出了一种"裁剪+重型扩展+轻型扩展"的元模型建模策略。给出了该建模策略下的具体实施步骤和方法,实现了一种支持CMMI过程改进的软件过程元建模,同时给出了基于该元模型的建模实例。实验结果表明,该元模型有助于软件组织建立体现其组织特征并有效支持符合CMMI框架的软件过程用户模型。
