Reliability evaluation for aircraft engines is difficult because of the scarcity of failure data. But aircraft engine data are available from a variety of sources. Data fusion has the function of maximizing the amount...Reliability evaluation for aircraft engines is difficult because of the scarcity of failure data. But aircraft engine data are available from a variety of sources. Data fusion has the function of maximizing the amount of valu- able information extracted from disparate data sources to obtain the comprehensive reliability knowledge. Consid- ering the degradation failure and the catastrophic failure simultaneously, which are competing risks and can affect the reliability, a reliability evaluation model based on data fusion for aircraft engines is developed, Above the characteristics of the proposed model, reliability evaluation is more feasible than that by only utilizing failure data alone, and is also more accurate than that by only considering single failure mode. Example shows the effective- ness of the proposed model.展开更多
A research on that how the topic of mobility, which is completely different but tightly relevant to space, provides new approaches and methods so as to promote the further development of geographic information service...A research on that how the topic of mobility, which is completely different but tightly relevant to space, provides new approaches and methods so as to promote the further development of geographic information services, will accumulate basic experience for different types of relative information systems in the wide fields of location based services. This paper analyzes the meaning of mobility and the change for geographic information service model, it describes the differences and correlation between M GIS and traditional GIS. It sets a technical framework of geographic information services according to mobile context and provides a case study.展开更多
微博是一种允许用户通过各种终端通讯方式进入互联网,虽诞生不久但却以强大的影响力受到用户的热爱。本研究以微博用户为研究对象,并采用UTAUT模型研究出了用户采纳微博的影响因素。文章引入了用户整合技术接受模型(Unified Theory of A...微博是一种允许用户通过各种终端通讯方式进入互联网,虽诞生不久但却以强大的影响力受到用户的热爱。本研究以微博用户为研究对象,并采用UTAUT模型研究出了用户采纳微博的影响因素。文章引入了用户整合技术接受模型(Unified Theory of Acceptance and Use of Technology,UTAUT)并总结UTAUT模型在移动互联网的领域的应用,根据微博的特性总结出了影响用户采纳微博的关键因素研究为7种因素假设如:用户使用意愿、努力期望、娱乐性动机、个性化动机、便利条件、绩效期望、社会影响、信息行动机。使用了问卷调查法收集资料,对微博用户进行调查,收回有效问卷338份并进行Spss18.0软件分析数据的一般特性、可靠性以及问卷的可信度。使用了Lisrel8.70软件来验证模型的拟合度。展开更多
基金Supported by the National Natural Science Foundation of China and Aviation Fund(60879001)the Natural Science Foundation of Jiangsu Province(BK2009378)+1 种基金the Fundamental Research Fund of Nanjing University of Aeronautics and Astronautics(NS2010179)the Qinglan Project of Jiangsu Province~~
文摘Reliability evaluation for aircraft engines is difficult because of the scarcity of failure data. But aircraft engine data are available from a variety of sources. Data fusion has the function of maximizing the amount of valu- able information extracted from disparate data sources to obtain the comprehensive reliability knowledge. Consid- ering the degradation failure and the catastrophic failure simultaneously, which are competing risks and can affect the reliability, a reliability evaluation model based on data fusion for aircraft engines is developed, Above the characteristics of the proposed model, reliability evaluation is more feasible than that by only utilizing failure data alone, and is also more accurate than that by only considering single failure mode. Example shows the effective- ness of the proposed model.
文摘A research on that how the topic of mobility, which is completely different but tightly relevant to space, provides new approaches and methods so as to promote the further development of geographic information services, will accumulate basic experience for different types of relative information systems in the wide fields of location based services. This paper analyzes the meaning of mobility and the change for geographic information service model, it describes the differences and correlation between M GIS and traditional GIS. It sets a technical framework of geographic information services according to mobile context and provides a case study.
文摘微博是一种允许用户通过各种终端通讯方式进入互联网,虽诞生不久但却以强大的影响力受到用户的热爱。本研究以微博用户为研究对象,并采用UTAUT模型研究出了用户采纳微博的影响因素。文章引入了用户整合技术接受模型(Unified Theory of Acceptance and Use of Technology,UTAUT)并总结UTAUT模型在移动互联网的领域的应用,根据微博的特性总结出了影响用户采纳微博的关键因素研究为7种因素假设如:用户使用意愿、努力期望、娱乐性动机、个性化动机、便利条件、绩效期望、社会影响、信息行动机。使用了问卷调查法收集资料,对微博用户进行调查,收回有效问卷338份并进行Spss18.0软件分析数据的一般特性、可靠性以及问卷的可信度。使用了Lisrel8.70软件来验证模型的拟合度。
