The rapid development of information technologies such as artificial intelligence,Internet and big data has promoted the deep integration of technology and education,especially the rise of large-scale online courses,...The rapid development of information technologies such as artificial intelligence,Internet and big data has promoted the deep integration of technology and education,especially the rise of large-scale online courses,which provides a great opportunity for curriculum teaching reform in colleges and universities.At the same time,artificial intelligence,as a cutting-edge technology,has good development prospects and has become a popular professional course in colleges and universities,artificial intelligence technology has become the focus of subject education in many universities.The combination of online education and AI courses will also greatly enhance the enthusiasm of users and expand the dissemination scope of big data and AI related courses.Based on the grounded theory and technology acceptance model,this paper obtains the users’perception evaluation of learning MOOC big data and artificial intelligence courses through field interviews,summarizes the core categories,constructs MOOC user acceptance model,collects sample data by questionnaire and makes an empirical study.It is found that perceived usefulness,expectation confirmation and primary communication effect have a significant positive impact on the secondary communication effect,and the content quality and socialization interaction indirectly affect the secondary communication effect of MOOC curriculum by affecting the primary communication effect.展开更多
目的用13N－NH3 PET门控心肌灌注显像（GMPI）评价局部心肌血流灌注及整体和局部心功能参数在监测放射性心脏损伤（RIHD）动态变化方面的价值。方法取6只雄性Beagle犬于照射前1周及照射（单次20 Gy）后3、6、12个月分别行13N－NH3 PET G...目的用13N－NH3 PET门控心肌灌注显像（GMPI）评价局部心肌血流灌注及整体和局部心功能参数在监测放射性心脏损伤（RIHD）动态变化方面的价值。方法取6只雄性Beagle犬于照射前1周及照射（单次20 Gy）后3、6、12个月分别行13N－NH3 PET GMPI。比较照射前后整体心功能参数[左心室射血分数（LVEF）、舒张末期容积（EDV）、收缩末期容积（ESV）]和局部心功能参数[室壁运动、室壁增厚、舒张末期心肌灌注（EDP）、收缩末期心肌灌注（ESP）]的差异。采用重复测量方差分析和配对t检验处理数据。结果与照射前相比，EDV和ESV、LVEF在照射后3个月未见明显变化；照射后6个月ESV增大，LVEF减小，EDV未见明显变化；照射后12个月ESV进一步扩大，LVEF进一步减小，EDV开始增大（F值：20.974～177.846，均P〈0.05）。与照射前相比，部分心肌节段室壁运动（10%，2/20）、室壁增厚（20%，4/20）、EDP（10%，2/20）及ESP（15%，3/20）在照射后3个月即出现变化且表现为功能增强（t值：14.446～672.315，均P〈0.05）；照射后6个月室壁运动（15%，3/20）、室壁增厚（20%，4/20）、EDP（15%，3/20）及ESP（25%，5/20）出现下降（t值：18.171～723.156，均P〈0.05）；照射后12个月室壁运动（35%，7/20）、室壁增厚（45%，9/20）、EDP（40%，8/20）及ESP（60%，12/20）下降更为明显（t值：14.783～711.259，均P〈0.05）。结论13N－NH3 PET GMPI可用于早期发现RIHD并监测RIHD的动态发展。与整体心功能参数相比，局部心功能参数（室壁运动、室壁增厚、EDP及ESP）更加灵敏，或可作为RIHD的早期监测指标。展开更多
文摘The rapid development of information technologies such as artificial intelligence,Internet and big data has promoted the deep integration of technology and education,especially the rise of large-scale online courses,which provides a great opportunity for curriculum teaching reform in colleges and universities.At the same time,artificial intelligence,as a cutting-edge technology,has good development prospects and has become a popular professional course in colleges and universities,artificial intelligence technology has become the focus of subject education in many universities.The combination of online education and AI courses will also greatly enhance the enthusiasm of users and expand the dissemination scope of big data and AI related courses.Based on the grounded theory and technology acceptance model,this paper obtains the users’perception evaluation of learning MOOC big data and artificial intelligence courses through field interviews,summarizes the core categories,constructs MOOC user acceptance model,collects sample data by questionnaire and makes an empirical study.It is found that perceived usefulness,expectation confirmation and primary communication effect have a significant positive impact on the secondary communication effect,and the content quality and socialization interaction indirectly affect the secondary communication effect of MOOC curriculum by affecting the primary communication effect.
文摘目的用13N－NH3 PET门控心肌灌注显像（GMPI）评价局部心肌血流灌注及整体和局部心功能参数在监测放射性心脏损伤（RIHD）动态变化方面的价值。方法取6只雄性Beagle犬于照射前1周及照射（单次20 Gy）后3、6、12个月分别行13N－NH3 PET GMPI。比较照射前后整体心功能参数[左心室射血分数（LVEF）、舒张末期容积（EDV）、收缩末期容积（ESV）]和局部心功能参数[室壁运动、室壁增厚、舒张末期心肌灌注（EDP）、收缩末期心肌灌注（ESP）]的差异。采用重复测量方差分析和配对t检验处理数据。结果与照射前相比，EDV和ESV、LVEF在照射后3个月未见明显变化；照射后6个月ESV增大，LVEF减小，EDV未见明显变化；照射后12个月ESV进一步扩大，LVEF进一步减小，EDV开始增大（F值：20.974～177.846，均P〈0.05）。与照射前相比，部分心肌节段室壁运动（10%，2/20）、室壁增厚（20%，4/20）、EDP（10%，2/20）及ESP（15%，3/20）在照射后3个月即出现变化且表现为功能增强（t值：14.446～672.315，均P〈0.05）；照射后6个月室壁运动（15%，3/20）、室壁增厚（20%，4/20）、EDP（15%，3/20）及ESP（25%，5/20）出现下降（t值：18.171～723.156，均P〈0.05）；照射后12个月室壁运动（35%，7/20）、室壁增厚（45%，9/20）、EDP（40%，8/20）及ESP（60%，12/20）下降更为明显（t值：14.783～711.259，均P〈0.05）。结论13N－NH3 PET GMPI可用于早期发现RIHD并监测RIHD的动态发展。与整体心功能参数相比，局部心功能参数（室壁运动、室壁增厚、EDP及ESP）更加灵敏，或可作为RIHD的早期监测指标。
