Objective The aims of this study were to describe nursing students′self-directed learning readiness and social problem solving and test their correlations in Macao.Methods This descriptive cross-sectional study was c...Objective The aims of this study were to describe nursing students′self-directed learning readiness and social problem solving and test their correlations in Macao.Methods This descriptive cross-sectional study was conducted on 140baccalaureate nursing students.A stratified random sampling was performed.The Self-directed Learning Readiness(SDLR)Scale and Chinese Social Problem-Solving Inventory-Revised(C-SPSI-R)were used.Results The response rate was 79.3%.Students possessed readiness for self-directed learning(mean 149.09±12.53,51.4%at high level,48.6%at low level).Regarding to social problem solving,the mean scores of each subscale were 9.35±3.25(Rational Problem Solving,RPS),10.26±3.23(Positive Problem Orientation,PPO),8.14±4.06(Negative Problem Orientation,NPO),5.67±4.44(Avoidance Style,AS),and 4.84±3.03(Impulsivity/Carelessness Style,ICS).SDLR was positively related to RPS and PPO,but was negatively related to AS.Conclusion Half of students possessed stronger readiness for self-directed learning.Students had a belief in the ability to solve problems,and adopted relevant strategies in solving problems.However,students still had negative and dysfunctional orientation and defective attempts in solving problems.Self-directed learning was positively related to positive and constructive orientation,but was negatively related to defective problem-solving pattern.Nurse educators should create educational climates for promoting student confidence and mutual responsibility for learning and their thinking process for problem solving.展开更多
交替方向乘子法(Alternating Direction Method of Multipliers,ADMM)求解两分块优化的研究已经逐渐完善,但对于非凸多分块优化的研究较少,提出了一种带松弛步长参数的对称邻近ADMM用于求解非凸一致性问题。在适当的假设条件下,证明了...交替方向乘子法(Alternating Direction Method of Multipliers,ADMM)求解两分块优化的研究已经逐渐完善,但对于非凸多分块优化的研究较少,提出了一种带松弛步长参数的对称邻近ADMM用于求解非凸一致性问题。在适当的假设条件下,证明了算法的全局收敛性。其次,在效益函数满足Kurdyka-Lojasiewicz(KL)性质时,证明了算法的强收敛性。最后,数值实验验证了算法的有效性。展开更多
As far as the weighted digraph is considered, an optimal directed spanning tree algorithm called table based algorithm (TBA) is proposed in the paper based on the table instead of the weighted digraph. The optimality ...As far as the weighted digraph is considered, an optimal directed spanning tree algorithm called table based algorithm (TBA) is proposed in the paper based on the table instead of the weighted digraph. The optimality is proved, and a numerical example is demonstrated.展开更多
物流作为现代经济的重要组成部分,在国民经济和社会发展中发挥着重要作用.物流中的三维装箱问题(Three-dimensional bin packing problem,3D-BPP)是提高物流运作效率必须解决的关键难题之一.深度强化学习(Deep rein-forcement learning,...物流作为现代经济的重要组成部分,在国民经济和社会发展中发挥着重要作用.物流中的三维装箱问题(Three-dimensional bin packing problem,3D-BPP)是提高物流运作效率必须解决的关键难题之一.深度强化学习(Deep rein-forcement learning,DRL)具有强大的学习与决策能力,基于DRL的三维装箱方法(Three-dimensional bin packing method based on DRL,DRL-3DBP)已成为智能物流领域的研究热点之一.现有DRL-3DBP面对大尺寸容器3D-BPP时难以达成动作空间、计算复杂性与探索能力之间的平衡.为此,提出一种四向协同装箱(Four directional cooperative packing,FDCP)方法:两阶段策略网络接收旋转后的容器状态,生成4个方向的装箱策略;根据由4个策略采样而得的动作更新对应的4个状态,选取其中价值最大的对应动作为装箱动作.FDCP在压缩动作空间、减小计算复杂性的同时,鼓励智能体对4个方向合理装箱位置的探索.实验结果表明,FDCP在100×100大尺寸容器以及20、30、50箱子数量的装箱问题上实现了1.2%~2.9%的空间利用率提升.展开更多
文摘Objective The aims of this study were to describe nursing students′self-directed learning readiness and social problem solving and test their correlations in Macao.Methods This descriptive cross-sectional study was conducted on 140baccalaureate nursing students.A stratified random sampling was performed.The Self-directed Learning Readiness(SDLR)Scale and Chinese Social Problem-Solving Inventory-Revised(C-SPSI-R)were used.Results The response rate was 79.3%.Students possessed readiness for self-directed learning(mean 149.09±12.53,51.4%at high level,48.6%at low level).Regarding to social problem solving,the mean scores of each subscale were 9.35±3.25(Rational Problem Solving,RPS),10.26±3.23(Positive Problem Orientation,PPO),8.14±4.06(Negative Problem Orientation,NPO),5.67±4.44(Avoidance Style,AS),and 4.84±3.03(Impulsivity/Carelessness Style,ICS).SDLR was positively related to RPS and PPO,but was negatively related to AS.Conclusion Half of students possessed stronger readiness for self-directed learning.Students had a belief in the ability to solve problems,and adopted relevant strategies in solving problems.However,students still had negative and dysfunctional orientation and defective attempts in solving problems.Self-directed learning was positively related to positive and constructive orientation,but was negatively related to defective problem-solving pattern.Nurse educators should create educational climates for promoting student confidence and mutual responsibility for learning and their thinking process for problem solving.
文摘交替方向乘子法(Alternating Direction Method of Multipliers,ADMM)求解两分块优化的研究已经逐渐完善,但对于非凸多分块优化的研究较少,提出了一种带松弛步长参数的对称邻近ADMM用于求解非凸一致性问题。在适当的假设条件下,证明了算法的全局收敛性。其次,在效益函数满足Kurdyka-Lojasiewicz(KL)性质时,证明了算法的强收敛性。最后,数值实验验证了算法的有效性。
基金the National Natural Science Foundation of China (No. 79870030).
文摘As far as the weighted digraph is considered, an optimal directed spanning tree algorithm called table based algorithm (TBA) is proposed in the paper based on the table instead of the weighted digraph. The optimality is proved, and a numerical example is demonstrated.
文摘物流作为现代经济的重要组成部分,在国民经济和社会发展中发挥着重要作用.物流中的三维装箱问题(Three-dimensional bin packing problem,3D-BPP)是提高物流运作效率必须解决的关键难题之一.深度强化学习(Deep rein-forcement learning,DRL)具有强大的学习与决策能力,基于DRL的三维装箱方法(Three-dimensional bin packing method based on DRL,DRL-3DBP)已成为智能物流领域的研究热点之一.现有DRL-3DBP面对大尺寸容器3D-BPP时难以达成动作空间、计算复杂性与探索能力之间的平衡.为此,提出一种四向协同装箱(Four directional cooperative packing,FDCP)方法:两阶段策略网络接收旋转后的容器状态,生成4个方向的装箱策略;根据由4个策略采样而得的动作更新对应的4个状态,选取其中价值最大的对应动作为装箱动作.FDCP在压缩动作空间、减小计算复杂性的同时,鼓励智能体对4个方向合理装箱位置的探索.实验结果表明,FDCP在100×100大尺寸容器以及20、30、50箱子数量的装箱问题上实现了1.2%~2.9%的空间利用率提升.
