Based on the basic principle of Time-Of-Flight cameras,a novel MATLAB/SIMULINK model is proposed to measure phase delay of a modulated light signal which represents the distance from camera to object. Subsequently,by ...Based on the basic principle of Time-Of-Flight cameras,a novel MATLAB/SIMULINK model is proposed to measure phase delay of a modulated light signal which represents the distance from camera to object. Subsequently,by discussing influence factors of phase measurement,it is found that the integration time,the sampling time,and the aliasing effect have important effect on improving the accuracy of phase measurement. Interestingly,by analyzing different integration time and sampling time, it is found that the best integration time and sampling time are 0.05 ms and 10 ns,respectively. In this case(i.e.,in absence of the aliasing effect),the variation range of the distance error is between 1 mm and 11 mm in the interval of one period. Especially,under the consideration of the aliasing effect,the average value of distance error is half of that in absence of the aliasing effect. This improves the accuracy of the distance measurement greatly.展开更多
兴趣发展四阶段模型(The Four-Phase Model of Interest Development)从兴趣发展过程的角度整合了情境兴趣与个体兴趣的研究,指出兴趣发展的四个主要阶段:激发的情境兴趣、维持的情境兴趣、最初的个体兴趣和稳定的个体兴趣。对兴趣发展...兴趣发展四阶段模型(The Four-Phase Model of Interest Development)从兴趣发展过程的角度整合了情境兴趣与个体兴趣的研究,指出兴趣发展的四个主要阶段:激发的情境兴趣、维持的情境兴趣、最初的个体兴趣和稳定的个体兴趣。对兴趣发展四阶段模型的理论基础、基本观点和假设,以及围绕四阶段模型开展的大量实证研究进行了介绍和整理,并提出兴趣发展四阶段模型存在的不足和未来研究的展望。展开更多
基金National Natural Science Foundation of China(6127404361233010)Hunan Provincial Natural Science Fund for Distinguished Young Scholars(2015JJ1014)
文摘Based on the basic principle of Time-Of-Flight cameras,a novel MATLAB/SIMULINK model is proposed to measure phase delay of a modulated light signal which represents the distance from camera to object. Subsequently,by discussing influence factors of phase measurement,it is found that the integration time,the sampling time,and the aliasing effect have important effect on improving the accuracy of phase measurement. Interestingly,by analyzing different integration time and sampling time, it is found that the best integration time and sampling time are 0.05 ms and 10 ns,respectively. In this case(i.e.,in absence of the aliasing effect),the variation range of the distance error is between 1 mm and 11 mm in the interval of one period. Especially,under the consideration of the aliasing effect,the average value of distance error is half of that in absence of the aliasing effect. This improves the accuracy of the distance measurement greatly.
文摘兴趣发展四阶段模型(The Four-Phase Model of Interest Development)从兴趣发展过程的角度整合了情境兴趣与个体兴趣的研究,指出兴趣发展的四个主要阶段:激发的情境兴趣、维持的情境兴趣、最初的个体兴趣和稳定的个体兴趣。对兴趣发展四阶段模型的理论基础、基本观点和假设,以及围绕四阶段模型开展的大量实证研究进行了介绍和整理,并提出兴趣发展四阶段模型存在的不足和未来研究的展望。
