Some methodological deficiencies in studies on traffic accident predictors

The paper discusses some methodological problems in (psychological) research on traffic accident predictors and reviews a convenience sample of the literature. Three methodological aspects are identified as being important: reliability of accident predictors, time period for accidents used as dependent variable, and culpability for accidents. Papers are scrutinized and most are found to be wanting in these aspects. Traffic researchers do not adhere to, or hardly even discuss, these basic methodological problems. It is concluded that the current research into (psychological) accident predictors is fraught with methodological deficiencies. Why most studies seem to be deficient in these aspects is not clear, as several researchers have pointed out these problems.     

空间对抗中的激光武器

作为威慑战略的一部份,美国正在发展摧毁卫星的能力,而开发激光反卫武器则是实 现空间控制的重要研发计划之一。本文首先初步分析了卫星对激光武器的易损性,然后评述和讨论了地基激光、机载激光和可伸缩的空天全球激光交战反卫武器的系统概念,关键技术和部件的重大进展,以及存在的问题。