Let A be a finite-dimensional algebra over an algebraically closed field k,E the category of all exact sequences in A-mod,MP(respectively,MI)the full subcategory of E consisting of those objects with projective(respec...Let A be a finite-dimensional algebra over an algebraically closed field k,E the category of all exact sequences in A-mod,MP(respectively,MI)the full subcategory of E consisting of those objects with projective(respectively,injective)middle terms.It is proved that MP(respectively,MI)is contravariantly finite(respectively,covariantly finite)in E.As an application,it is shown that MP=MI is functorially finite and has Auslander-Reiten sequences provided A is selfinjective.展开更多
文摘目的探讨体检数据与非酒精性脂肪性肝病(non-alcoholic fatty liver disease,NAFLD)的相关性,建立基于多靶标联合分析的NAFLD高效诊断模型。方法回顾性分析2021-01~12月作者单位疗养员的临床资料,通过训练集(80%样本)构建诊断模型并利用验证集(20%样本)评价诊断效果。联合Logistic回归和受试者工作特征(receiver operating characteristic,ROC)曲线筛选并评价不同组合的诊断效能。结果Logistic回归分析显示,体质量指数(body mass index,BMI)、丙氨酸氨基转移酶(alanine transaminase,ALT)、高密度脂蛋白(high-density lipoprotein,HDL)、尿酸(uric acid,UA)和血小板(platelet,PLT)与NAFLD密切相关。ROC曲线分析发现,联合BMI、ALT、HDL、UA和PLT的多靶标诊断模型显示出色的诊断价值,训练集中的曲线下面积(area under the curve,AUC)达0.981(95%CI:0.971~0.991),验证集为0.951(95%CI:0.931~0.972)。结论多靶标联合诊断模型对NAFLD具有重要价值,能满足体检人群和空勤疗养员NAFLD的筛检需求。
基金supported by National Natural Science Foundation of China(Grant No.11271257)National Science Foundation of Shanghai Municiple(Granted No.13ZR1422500)
文摘Let A be a finite-dimensional algebra over an algebraically closed field k,E the category of all exact sequences in A-mod,MP(respectively,MI)the full subcategory of E consisting of those objects with projective(respectively,injective)middle terms.It is proved that MP(respectively,MI)is contravariantly finite(respectively,covariantly finite)in E.As an application,it is shown that MP=MI is functorially finite and has Auslander-Reiten sequences provided A is selfinjective.
