随着时代的发展,各种生活物品的更新速度也在不断加快。而互联网二手商品交易平台的存在为大家买卖二手商品提供了平台,二手交易平台的出现促进了社会资源的再次利用,其绿色属性助力环保生活的实现。本文通过发放调查问卷,得到了长沙市...随着时代的发展,各种生活物品的更新速度也在不断加快。而互联网二手商品交易平台的存在为大家买卖二手商品提供了平台,二手交易平台的出现促进了社会资源的再次利用,其绿色属性助力环保生活的实现。本文通过发放调查问卷,得到了长沙市民关于购买二手产品的详细信息。通过卡方检验,发现购买二手商品的意愿与受访者性别、收入和二手市场发展前景无关。最后,我们利用主成分分析法,得到了受访者对二手市场前景的态度,并探究了二手市场存在的相关问题。With the development of The Times, the update speed of various life goods is also accelerating. The existence of the Internet second-hand commodity trading platform provides a platform for everyone to buy and sell second-hand commodities. The emergence of the second-hand trading platform promotes the reuse of social resources, and its green attributes help to realize the environmental protection life. This paper obtains more detailed information about the purchase of second-hand products among citizens of Changsha through questionnaires. Through Chi-square test, it is found that the willingness to purchase second-hand goods has nothing to do with the gender, income and development prospects of the second-hand market of the respondents. Finally, we use the principal component analysis to get the respondents’ attitude towards the prospect of the second-hand market and explore the related problems existing in the second-hand market.展开更多
文摘随着时代的发展,各种生活物品的更新速度也在不断加快。而互联网二手商品交易平台的存在为大家买卖二手商品提供了平台,二手交易平台的出现促进了社会资源的再次利用,其绿色属性助力环保生活的实现。本文通过发放调查问卷,得到了长沙市民关于购买二手产品的详细信息。通过卡方检验,发现购买二手商品的意愿与受访者性别、收入和二手市场发展前景无关。最后,我们利用主成分分析法,得到了受访者对二手市场前景的态度,并探究了二手市场存在的相关问题。With the development of The Times, the update speed of various life goods is also accelerating. The existence of the Internet second-hand commodity trading platform provides a platform for everyone to buy and sell second-hand commodities. The emergence of the second-hand trading platform promotes the reuse of social resources, and its green attributes help to realize the environmental protection life. This paper obtains more detailed information about the purchase of second-hand products among citizens of Changsha through questionnaires. Through Chi-square test, it is found that the willingness to purchase second-hand goods has nothing to do with the gender, income and development prospects of the second-hand market of the respondents. Finally, we use the principal component analysis to get the respondents’ attitude towards the prospect of the second-hand market and explore the related problems existing in the second-hand market.
文摘针对机载无源侦察系统某批信号测向结果引入异常点的问题,提出一种基于卡方检验的测向异常点抑制滤波算法。该算法通过在无迹卡尔曼滤波(Unscented Kalman Filter,UKF)算法中引进卡方检验方法,检验测向结果测量残差,实时判断当前测量值中是否存在异常点,进而通过调整相应参数对异常点进行抑制。采用蒙特卡洛模拟(Monte Carlo Method,MC)仿真实验进行验证,结果表明,与传统的无迹卡尔曼滤波算法相比,所提算法能够较好地抑制测向异常点,验证了所提算法的有效性。
