Programming ability has become one of the most practical basic skills,and it is also the foundation of software development.However,in the daily training experiment,it is difficult for students to find suitable exerci...Programming ability has become one of the most practical basic skills,and it is also the foundation of software development.However,in the daily training experiment,it is difficult for students to find suitable exercises from a large number of topics provided by numerous online judge(OJ)systems.Recommending high passing rate topics with an effective prediction algorithm can effectively solve the problem.Directly applying some common prediction algorithms based on knowledge tracing could bring some problems,such as the lack of the relationship among programming exercises and dimension disaster of input data.In this paper,those problems were analyzed,and a new prediction algorithm was proposed.Additional information,which represented the relationship between exercises,was added in the input data.And the input vector was also compressed to solve the problem of dimension disaster.The experimental results show that deep knowledge tracing(DKT)with side information and compression(SC)model has an area under the curve(AUC)of 0.7761,which is better than other models based on knowledge tracing and runs faster.展开更多
本文从Web of Science和PsychINFO两个外文数据库中检察自闭症谱系障碍儿童指称行为的研究文献,并从自然会话、故事叙说和高度结构化任务三种交际情境进行综述。分析结果表明,自闭症儿童的指称行为在这三种不同交际情境下均表现出异于...本文从Web of Science和PsychINFO两个外文数据库中检察自闭症谱系障碍儿童指称行为的研究文献,并从自然会话、故事叙说和高度结构化任务三种交际情境进行综述。分析结果表明,自闭症儿童的指称行为在这三种不同交际情境下均表现出异于正常发展儿童的特征,而这些差异与其非语言智商、语言能力、心理理论以及执行功能等因素密切相关。在综述的基础上,本文提出了该领域今后有待进一步拓展的空间,期待为国内相关研究和教育实践提供启示和借鉴。展开更多
Polymer science entails the structural study at multi-levels from nano-to micro-and mesoscale,which is highly important to transfer or even amplify the molecular information to macroscopic materials.Multiple polymer s...Polymer science entails the structural study at multi-levels from nano-to micro-and mesoscale,which is highly important to transfer or even amplify the molecular information to macroscopic materials.Multiple polymer structural transitions from lower-order to higher-order superstructures are normally involved to achieve selective,efficient and sophisticated functions.Therefore,in-situ visualization of these processes is highly important,not only for fundamental understanding the structural evolution,but also for the optimization of the process flow during the materials processing.Fluorescence imaging based on aggregation-induced emission(AIE)provides an ideal tool that offers a simple,accurate,and easy-readable method to fulfill the above requirements.Owing to the twisted propeller-like structure of AIE luminogens(AIEgens),they show high fluorescence sensitivity to the surrounding microenvironment(e.g.,viscosity,rigidity,and polarity)through intramolecular motions.In this short review,we summarize the recent applications of AIEgens to serve as“built-in”sensors to analyze the process of polymerization,microphase separation,glass/vitrification transition,polymer solvation,crystallization,etc.The perspective on the future application of AIE technology in polymer engineering,especially fiber materials,is also discussed.展开更多
文摘Programming ability has become one of the most practical basic skills,and it is also the foundation of software development.However,in the daily training experiment,it is difficult for students to find suitable exercises from a large number of topics provided by numerous online judge(OJ)systems.Recommending high passing rate topics with an effective prediction algorithm can effectively solve the problem.Directly applying some common prediction algorithms based on knowledge tracing could bring some problems,such as the lack of the relationship among programming exercises and dimension disaster of input data.In this paper,those problems were analyzed,and a new prediction algorithm was proposed.Additional information,which represented the relationship between exercises,was added in the input data.And the input vector was also compressed to solve the problem of dimension disaster.The experimental results show that deep knowledge tracing(DKT)with side information and compression(SC)model has an area under the curve(AUC)of 0.7761,which is better than other models based on knowledge tracing and runs faster.
文摘本文从Web of Science和PsychINFO两个外文数据库中检察自闭症谱系障碍儿童指称行为的研究文献,并从自然会话、故事叙说和高度结构化任务三种交际情境进行综述。分析结果表明,自闭症儿童的指称行为在这三种不同交际情境下均表现出异于正常发展儿童的特征,而这些差异与其非语言智商、语言能力、心理理论以及执行功能等因素密切相关。在综述的基础上,本文提出了该领域今后有待进一步拓展的空间,期待为国内相关研究和教育实践提供启示和借鉴。
基金This work is supported by the National Natural Science Foundation of China(No.51973030)the Shanghai Rising-Star Program,China(No.20QA1400100)the Foundation of the Science and Technology Commission of Shanghai Municipality,China(No.20JC1414900).
文摘Polymer science entails the structural study at multi-levels from nano-to micro-and mesoscale,which is highly important to transfer or even amplify the molecular information to macroscopic materials.Multiple polymer structural transitions from lower-order to higher-order superstructures are normally involved to achieve selective,efficient and sophisticated functions.Therefore,in-situ visualization of these processes is highly important,not only for fundamental understanding the structural evolution,but also for the optimization of the process flow during the materials processing.Fluorescence imaging based on aggregation-induced emission(AIE)provides an ideal tool that offers a simple,accurate,and easy-readable method to fulfill the above requirements.Owing to the twisted propeller-like structure of AIE luminogens(AIEgens),they show high fluorescence sensitivity to the surrounding microenvironment(e.g.,viscosity,rigidity,and polarity)through intramolecular motions.In this short review,we summarize the recent applications of AIEgens to serve as“built-in”sensors to analyze the process of polymerization,microphase separation,glass/vitrification transition,polymer solvation,crystallization,etc.The perspective on the future application of AIE technology in polymer engineering,especially fiber materials,is also discussed.