副词“亲自”的多角度研究

探讨了汉语副词“亲自”对动词的选择限制和语用功能。在词汇层面,“亲自”要求它后边的动词是非贬义的,是表示可代劳的个人社会行为的自主动词。本质上,“亲自”是一个直接行事途径标记和反预期信息标记。在具体语境中,它还能体现出其他附加的语用含义。     

土地要素对中国经济增长贡献研究

现阶段土地要素对我国经济增长贡献显著。本文构建了包含土地要素的超越对数生产函数模型,运用岭回归方法,实证研究了土地要素对于经济增长的影响。研究结果表明1997—2008年间,土地要素对我国经济增长的贡献率达到了20%~30%。本文认为随着我国城市化和工业化的逐步实现,年新增建设用地将不断减少,土地要素对于经济增长的贡献率也将逐渐降低。     

陕西省区域技术创新能力影响因素分析

根据陕西省1991—2008年统计数据,利用岭回归估计建立模型,运用知识生产函数对陕西省区域技术创新能力影响因素进行实证分析。研究结果表明：科研机构、企业和高校科技投入对陕西区域技术创新产出具有显著的作用,而人力资本投入对陕西区域技术创新产出作用不显著。     

非均匀脊波导的横向等效电路分析

均匀平板传输线中的不连续性等效电容已经有了比较满意的求法.由此所得的电容值可应用于均匀脊波导的截止波长的计算.本文考虑含有两种不同介质的脊波导的情况,求得截止和导波状态下横向等效电路中的不连续性等效电容.并由横向谐振法推出这种不均匀情况下脊波导的截止波长和色散关系.     

Robust two parameter ridge M-estimator for linear regression

The problem of multicollinearity and outliers in the data set produce undesirable effects on the ordinary least squares estimator. Therefore, robust two parameter ridge estimation based on M-estimator (ME) is introduced to deal with multicollinearity and outliers in the y-direction. The proposed estimator outperforms ME, two parameter ridge estimator and robust ridge M-estimator according to mean square error criterion. Moreover, a numerical example and a Monte Carlo simulation experiment are presented.     

Health insurance system and resilience to epidemics

We theoretically analyze the resilience (efficiency) of health insurance systems and diverse factors including trace and test technology, infection and contagion rates, and social distancing/lockdown policy, in coping with contagious diseases like COVID-19. Our findings can be summarized as follows. First, public insurance is more resilient than market insurance, as the former's investment in test technology is made at the social optimum, whereas the latter's investment is less. The decentralized behavior of competing insurers leads to a less resilient outcome. Second, resilience decreases as the market becomes more competitive because the externality effect becomes more severe. Third, a higher contagion rate, a more cost-efficient test technology or a higher initial infection rate unless it is not too high, leads to a higher test accuracy level. Fourth, the socially optimal social distancing/lockdown policy is determined by comparison between its relative costs and the benefit from contagion reduction.