We know many of our IT projects fail and disappoint. The poor state of requirements methods and practice is frequently stated as a factor for IT project failure. In this paper, I discuss what I believe is the fundamen...We know many of our IT projects fail and disappoint. The poor state of requirements methods and practice is frequently stated as a factor for IT project failure. In this paper, I discuss what I believe is the fundamental cause: we think like programmers, not engineers and managers. We do not concentrate on value delivery, but instead on functions, on use-cases and on code delivery. Further, management is not taking its responsibility to make things better. In this paper, ten practical key principles are proposed, which aim to improve the quality of requirements specification.展开更多
针对国内航空发动机研制面临需求分析和需求验证薄弱、正向研发能力欠缺的情况,在民用飞机及系统开发指南要求的基础上,构建了基于系统工程V模型的航空发动机正向设计流程,从需求定义、需求分析、需求确认、功能分析、功能危害性分析、...针对国内航空发动机研制面临需求分析和需求验证薄弱、正向研发能力欠缺的情况,在民用飞机及系统开发指南要求的基础上,构建了基于系统工程V模型的航空发动机正向设计流程,从需求定义、需求分析、需求确认、功能分析、功能危害性分析、逻辑架构设计、物理架构设计与权衡、设计实现、系统安全性评估及产品集成与验证等方面开展航空发动机的正向设计。将建立的基于系统工程V模型的航空发动机正向设计流程应用到某型航空发动机的设计中,利用DOORS软件进行航空发动机设计的需求定义,采用故障树分析(Fault Tree Analysis,FTA)法进行系统安全性评估,有效提高了航空发动机正向设计的能力和水平。对于提升航空发动机研制质量,交付满足用户需求的航空发动机产品具有重要意义。展开更多
This paper puts forward a survivability evaluation model, SQEM （Survivability Quantitative Evaluation Model）, based on lucubrating the main method existed. Then it defines the measurement factors and parses the surv...This paper puts forward a survivability evaluation model, SQEM （Survivability Quantitative Evaluation Model）, based on lucubrating the main method existed. Then it defines the measurement factors and parses the survivability mathematically, introduces state change probability and the idea of setting the weights of survivability factors dynamically into the evaluating process of SQEM, which improved the accuracy of evaluation. An example is presented to illustrate the way SQEM works, which demonstrated the validity and feasibility of the method.展开更多
文摘We know many of our IT projects fail and disappoint. The poor state of requirements methods and practice is frequently stated as a factor for IT project failure. In this paper, I discuss what I believe is the fundamental cause: we think like programmers, not engineers and managers. We do not concentrate on value delivery, but instead on functions, on use-cases and on code delivery. Further, management is not taking its responsibility to make things better. In this paper, ten practical key principles are proposed, which aim to improve the quality of requirements specification.
文摘针对国内航空发动机研制面临需求分析和需求验证薄弱、正向研发能力欠缺的情况,在民用飞机及系统开发指南要求的基础上,构建了基于系统工程V模型的航空发动机正向设计流程,从需求定义、需求分析、需求确认、功能分析、功能危害性分析、逻辑架构设计、物理架构设计与权衡、设计实现、系统安全性评估及产品集成与验证等方面开展航空发动机的正向设计。将建立的基于系统工程V模型的航空发动机正向设计流程应用到某型航空发动机的设计中,利用DOORS软件进行航空发动机设计的需求定义,采用故障树分析(Fault Tree Analysis,FTA)法进行系统安全性评估,有效提高了航空发动机正向设计的能力和水平。对于提升航空发动机研制质量,交付满足用户需求的航空发动机产品具有重要意义。
基金Supported by Natural Science Fundation of HebeiProvince (F2004000133)
文摘This paper puts forward a survivability evaluation model, SQEM （Survivability Quantitative Evaluation Model）, based on lucubrating the main method existed. Then it defines the measurement factors and parses the survivability mathematically, introduces state change probability and the idea of setting the weights of survivability factors dynamically into the evaluating process of SQEM, which improved the accuracy of evaluation. An example is presented to illustrate the way SQEM works, which demonstrated the validity and feasibility of the method.
