目的检验中文版儿童自我报告结局测量信息系统(child self-reported Chinese version of pediatric PROMIS,C-C-Ped-PROMIS)八大简表在哮喘儿童与青少年人群中的可行性及信效度。方法便利抽样法选取上海市2所医院的8~17周岁儿童和青少...目的检验中文版儿童自我报告结局测量信息系统(child self-reported Chinese version of pediatric PROMIS,C-C-Ped-PROMIS)八大简表在哮喘儿童与青少年人群中的可行性及信效度。方法便利抽样法选取上海市2所医院的8~17周岁儿童和青少年哮喘患者为研究对象,采用一般资料调查表、C-C-Ped-PROMIS及哮喘控制问卷对其进行调查,采用问卷有效回收率及回答有效性来分析其可行性,并检验其信效度。结果儿童身体功能-移动性、身体功能-上肢功能、疲劳、疼痛影响、焦虑、愤怒、抑郁症状、同伴关系各简表条目总分相关系数介于0.520~0.843之间,均具有单维度因子结构,Cronbach’sα系数介于0.813~0.916之间,Guttma折半系数介于0.754~0.902之间。结论儿童自我报告结局测量信息系统简表具有良好的可行性和信效度,可用于中国哮喘儿童与青少年生理、心理及社会等各方面健康结局的测评。展开更多
We consider the problem of nearly optimal energy efficiency in massive(Multiinput Multi-output) MIMO systems. Considering the correlated channel in practice, we derive the ergodic expression with zero-forcing precodin...We consider the problem of nearly optimal energy efficiency in massive(Multiinput Multi-output) MIMO systems. Considering the correlated channel in practice, we derive the ergodic expression with zero-forcing precoding and analyze the simplified antennas selection method. Aiming at optimizing the energy efficiency, the closed form expressions of the nearly optimal number of transmit antennas and transmit power are given under the circuit consumption model. The joint solution of the number of transmit antennas and transmit power was replaced to only solve transmit power. Based on the expression only related with transmit power, we give an energy efficiency optimization algorithm. The simulation results show that the proposed algorithm can achieve nearly optimal energy efficiency with fast convergence speed.展开更多
文摘目的检验中文版儿童自我报告结局测量信息系统(child self-reported Chinese version of pediatric PROMIS,C-C-Ped-PROMIS)八大简表在哮喘儿童与青少年人群中的可行性及信效度。方法便利抽样法选取上海市2所医院的8~17周岁儿童和青少年哮喘患者为研究对象,采用一般资料调查表、C-C-Ped-PROMIS及哮喘控制问卷对其进行调查,采用问卷有效回收率及回答有效性来分析其可行性,并检验其信效度。结果儿童身体功能-移动性、身体功能-上肢功能、疲劳、疼痛影响、焦虑、愤怒、抑郁症状、同伴关系各简表条目总分相关系数介于0.520~0.843之间,均具有单维度因子结构,Cronbach’sα系数介于0.813~0.916之间,Guttma折半系数介于0.754~0.902之间。结论儿童自我报告结局测量信息系统简表具有良好的可行性和信效度,可用于中国哮喘儿童与青少年生理、心理及社会等各方面健康结局的测评。
基金supported by the Natural Science Foundation of China(61201135)State 863 Project(2014AA01A704)111 Project(B08038)
文摘We consider the problem of nearly optimal energy efficiency in massive(Multiinput Multi-output) MIMO systems. Considering the correlated channel in practice, we derive the ergodic expression with zero-forcing precoding and analyze the simplified antennas selection method. Aiming at optimizing the energy efficiency, the closed form expressions of the nearly optimal number of transmit antennas and transmit power are given under the circuit consumption model. The joint solution of the number of transmit antennas and transmit power was replaced to only solve transmit power. Based on the expression only related with transmit power, we give an energy efficiency optimization algorithm. The simulation results show that the proposed algorithm can achieve nearly optimal energy efficiency with fast convergence speed.
