Domain analysis is essential to core assets development in software product line engineering. Most existing approaches, however, depend on domain experts’ experience to analyze the commonality and variability of syst...Domain analysis is essential to core assets development in software product line engineering. Most existing approaches, however, depend on domain experts’ experience to analyze the commonality and variability of systems in a domain, which remains a manual and intensive process. This paper addresses the issue by proposing a model-driven approach to automating the domain requirements derivation process. The paper focuses on the match between the use cases of existing individual products and the domain functional requirements of a product line. By introducing a set of linguistic description dimensions to differentiate the sub-variations in a use case, the use case template is extended to model variability. To this end, a transformation process is formulated to sustain and deduce the information in use cases, and to match it to domain functional requirements. This paper also presents a prototype which implements the derivation as a model transformation described in a graphical model transformation language MOLA. This approach complements existing domain analysis techniques with less manual operation cost and more efficiency by automating the domain functional requirements development.展开更多
针对目前空管特情处置过程中案例记录利用不足的问题,提出了空管特情案例利用框架,并重点研究了其中的案例特征提取方法。基于TextRank算法提出了融合空管特情领域知识与数据分析的特情案例特征提取算法(Special Situation Case TextRan...针对目前空管特情处置过程中案例记录利用不足的问题,提出了空管特情案例利用框架,并重点研究了其中的案例特征提取方法。基于TextRank算法提出了融合空管特情领域知识与数据分析的特情案例特征提取算法(Special Situation Case TextRank,SSC TextRank)。所提方法利用空管特情领域知识构建领域词典,以提升分词效果,依据风险知识及文本数据分析结果,同时结合层次分析法赋权原理对文本中的特征词进行赋权,以优化各词的初始重要度以及词语重要度权重的计算方法。利用某地区空管局提供的2000年—2019年特情案例验证算法的有效性。结果表明:模型较传统自然语言处理中的关键词提取算法准确率提高了约40%,体现了所提方法在特情案例特征提取方面的有效性和优越性。展开更多
航空发动机在运行过程中,由于其结构的复杂性和外部气流的不稳定性,不可避免地会产生大量的振动问题。针对航空发动机整机振动问题,首先根据航空发动机的实际结构并结合经验总结,建立了一种通用的转子‑支承‑机匣振动传递动力学模型,并...航空发动机在运行过程中,由于其结构的复杂性和外部气流的不稳定性,不可避免地会产生大量的振动问题。针对航空发动机整机振动问题,首先根据航空发动机的实际结构并结合经验总结,建立了一种通用的转子‑支承‑机匣振动传递动力学模型,并从航空发动机内外机匣减振控制问题出发,利用一种新型的控制算法(几何设计法),在有限频域内来设计减振控制器,在传感器和执行机构受限的情况下,尝试对多个输出量(即航空发动机的内机匣和外机匣)进行减振控制,并与经典控制理论法比例、微分、积分(Proportional integral derivative,PID)设计的减振控制器进行减振效果对比,最后通过Matlab/Simulink搭建仿真模型并进行仿真验证。结果表明,几何设计法在有限频域内可以直观地获得最优控制器的存在性、唯一性、最优性,对于主控对象的减振控制最优可高达25 dB,相较于传统控制方法形成明显优势。展开更多
文摘Domain analysis is essential to core assets development in software product line engineering. Most existing approaches, however, depend on domain experts’ experience to analyze the commonality and variability of systems in a domain, which remains a manual and intensive process. This paper addresses the issue by proposing a model-driven approach to automating the domain requirements derivation process. The paper focuses on the match between the use cases of existing individual products and the domain functional requirements of a product line. By introducing a set of linguistic description dimensions to differentiate the sub-variations in a use case, the use case template is extended to model variability. To this end, a transformation process is formulated to sustain and deduce the information in use cases, and to match it to domain functional requirements. This paper also presents a prototype which implements the derivation as a model transformation described in a graphical model transformation language MOLA. This approach complements existing domain analysis techniques with less manual operation cost and more efficiency by automating the domain functional requirements development.
文摘针对目前空管特情处置过程中案例记录利用不足的问题,提出了空管特情案例利用框架,并重点研究了其中的案例特征提取方法。基于TextRank算法提出了融合空管特情领域知识与数据分析的特情案例特征提取算法(Special Situation Case TextRank,SSC TextRank)。所提方法利用空管特情领域知识构建领域词典,以提升分词效果,依据风险知识及文本数据分析结果,同时结合层次分析法赋权原理对文本中的特征词进行赋权,以优化各词的初始重要度以及词语重要度权重的计算方法。利用某地区空管局提供的2000年—2019年特情案例验证算法的有效性。结果表明:模型较传统自然语言处理中的关键词提取算法准确率提高了约40%,体现了所提方法在特情案例特征提取方面的有效性和优越性。
文摘航空发动机在运行过程中,由于其结构的复杂性和外部气流的不稳定性,不可避免地会产生大量的振动问题。针对航空发动机整机振动问题,首先根据航空发动机的实际结构并结合经验总结,建立了一种通用的转子‑支承‑机匣振动传递动力学模型,并从航空发动机内外机匣减振控制问题出发,利用一种新型的控制算法(几何设计法),在有限频域内来设计减振控制器,在传感器和执行机构受限的情况下,尝试对多个输出量(即航空发动机的内机匣和外机匣)进行减振控制,并与经典控制理论法比例、微分、积分(Proportional integral derivative,PID)设计的减振控制器进行减振效果对比,最后通过Matlab/Simulink搭建仿真模型并进行仿真验证。结果表明,几何设计法在有限频域内可以直观地获得最优控制器的存在性、唯一性、最优性,对于主控对象的减振控制最优可高达25 dB,相较于传统控制方法形成明显优势。
