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印刷品质量的主观评价   总被引:5,自引:3,他引:2  
通过介绍印刷品质量的主观评价观测条件、评价指标等,对印刷品质量主观评价方法进行详细介绍。在统一的观测条件下,利用定性指标评价法,能够使得主观评价结果获得较好的一致性,且可操作性好。  相似文献
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铁路空调客车硬座车厢空气品质的主观评价   总被引:4,自引:0,他引:4  
本文采用问卷调查的形式对铁路空调客车硬座车厢内的空气品质进行了主观评价,并对这次问卷调查进行了数理统计与分析。研究表明:导致车内空气品质不佳的主要原因是车厢内气温控制不当以及新风量不足。  相似文献
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陈克安  朱岩 《声学技术》2014,(5):454-459
传统的有关噪声对人影响的描述与定量评价一般仅限于针对低强度的噪声(不至于引起听觉损伤的噪声)。近年来,由于强声问题日益受到关注,强声效应描述的研究变得尤为迫切。首先建立了初级描述词库,然后通过主观评价实验进行一系列筛选,最终获得强声对人心理效应的描述。此外,完成了不同强声物理属性(声压级、持续时间和频率)下的主观评价实验,获得了强声对人影响的定量描述数据,为后续强声效应建模研究奠定了基础。  相似文献
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The aim of this study is to evaluate brain regions related with excessive binocular disparity that may be linked to stereoscopic visual fatigue. In stereoscopic displays, excessive binocular disparity may generate blurring or double vision in the stereovision and induce unnatural oscillations in accommodation and vergence. These phenomena may lead to visual fatigue and activation (or deactivation) of human brain related with sensory and eye movement functions. A functional magnetic resonance imaging (fMRI) method is used to investigate the effect of excessive binocular disparity on human brain. Subjective assessments of visual fatigue are also conducted with the same stimuli as the fMRI experiment. Based on the subjective assessment results, participants are classified into low‐ and high‐fatigue groups. From the fMRI experiments, the high‐fatigue group showed more activation at the intraparietal sulcus (IPS) than the low‐fatigue group, when viewing an excessive disparity stimulus. The results showed that the excessive binocular disparity stimulus may induce overload to the IPS region, which is related with stereo processing and saccadic eye movement. In addition, it could be possible to use fMRI as an objective measurement method for understanding the stereoscopic visual fatigue when stimuli with excessive binocular disparity are applied.  相似文献
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Fuzzy coding vs. crisp coding and then local coding vs. global coding is proposed to transform a quantitative scale into a category scale. Such a transformation technique is seen as the most general one to investigate either heterogeneous but quantitative variables or variables with different scale models (both quantitative and qualitative). A major point of fuzzy coding is that space modalities can be built very early in the statistical analysis process and from a discussion between several specialists. The multiple correspondence analysis (MCA) is proposed to investigate a table where the data come from fuzzy coding; the table rows corresponding to the empirical situations and the columns to the space modalities of the respective variables. Two examples are considered. First, a didactic data set is designed in order to compare the principal component analysis, the MCA with crisp coding and the MCA with fuzzy coding. Second, an example about a sitting posture study is considered in order to show the possibility of achieving relationships between objective and subjective data. The empirical situations correspond to adjustment combinations of the seat, the table and the backrest; the variables are posture indicators and subjective assessments. The main result is that the subjective variables have a much more consistent evolution with the adjustments than the objective ones. Consequently, there is a poor connection between these two sets of variables. The backrest is the furniture setting with the highest influence. From the interpretation of the MCA factor planes, it is possible to find the best and the worst adjustment combinations.  相似文献
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本文以等响处理后的车内噪声为研究对象,进行噪声声品质的主观评价研究。研究发现,人群分类处理对于揭示噪声声品质的主观感知属性起着重要的作用。对于评价者分类处理之后,两类评价者对于车内噪声的偏好性均可采用一个维度表示,并可直接采用成对比较法的直接排序法获得;一类评价者的偏好性与低沉度成正比,而另一类评价者与低沉度成反比。如果未进行人群分类处理,则不能很好地解释其主观感知属性。  相似文献
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飞行员工作负荷作为一个多维且较为复杂的研究对象,其受大量影响因素的影响。本文将建立完整的民航飞行员工作负荷影响因素体系,并对各影响因素的相对重要度进行分析。首先在工作负荷及其影响因素的分析研究基础上,结合飞机驾驶舱环境和飞行环境,通过与飞行员面谈的方法建立了影响因素体系。然后结合专家主观评估对飞行员工作负荷的影响因素指标进行筛选,采用5点Likert型标度获得各影响因素的相对重要性。最终建立了由飞行任务,飞行环境,驾驶舱人机界面,个体因素四大类下的完整的民航飞行员工作负荷影响体系。通过因素的重要度分析结果发现,影响程度最大的前四个影响因素依次为:时间压力、飞机类型(真机、模拟)、飞行时间、飞行阶段。完整的飞行员工作负荷影响因素体系对飞行员工作负荷的研究工作的开展有着重要的指导作用,同时提高工作负荷预测模型的精度。  相似文献
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