Evaluation of frequency-lowering algorithms for intelligibility of Chinese speech in hearing-aid users

Despite the attention being given to and the knowledge of the benefits of evaluating frequency-lowering algorithms for hearing-impaired people, the causality between these algorithms and their benefits is still not clear. This is aggravated by the fact that comparative research on the methodologies and skills required for fitting an appropriate algorithm to individual patients is lacking. Against this back-drop, the current study has attempted to make progress in this area. In this experiment, six experienced traditional hearing-aid users with severe impairments in the high frequencies were fitted with two different frequency-lowering methods, and weekly hearing tests were con-ducted to track the benefits of such methods. After the experiment, five of the listeners accepted the frequency-lowering algorithms. Both methods showed superior results when compared with the listeners' own hearing aids in most of the tests, and the segmented compression algorithm was indicated to have better "anti-noise" quality and speech intelligibility improvement capabilities. A preference for the appli-cation of proportional compression to unvoiced speech was also found in this algorithm. Unlike in previous studies, all speech materials here are recorded in Chinese. Therefore, the results could also be used to evaluate the benefits of frequency-lowering to the intelligibility of Chinese speech for patients. As a result, an improvement was found, especially in the recognition of consonants. Moreover, no adverse effect was found in intonation recognition.     

《等待戈多》的语言特色

塞缪尔·贝克特的《等待戈多》是荒诞派戏剧的经典,其创作主题、创作风格及创作手段完全不同于传统的戏剧形式。《等待戈多》的对自体现了西方人信仰破灭后的尴尬处境及其对被拯救的渴望。     

中国健康女性最大通气量正常参考值的地理环境分布规律

为制定中国健康女性最大通气量（MVV）正常参考值的统一标准提供科学依据,收集了中国39个单位测定的3053例健康女性最大通气量正常参考值,应用SPSS统计软件,运用相关分析和回归分析的方法,研究其与8项地理环境要素的关系．结果发现健康女性最大通气量正常参考值与中国地理环境要素有显著的相关关系,并用逐步回归分析的方法推导出了回归方程．结论为如果知道了中国某地的地理环境要素数值,就可以用回归方程计算出该地的健康女性最大通气量正常参考值．依据健康女性最大通气量正常参考值与地理环境要素的依赖关系,把中国划分为东北、华北、晋陕内蒙古、长江中下游、东南、西北、西南、青藏8个区．     

基于二阶循环统计量的频谱感知方法

认知无线电可以自动感知周围环境并能调整系统参数,以适应环境的变化,是一种新的智能无线通信技术,而有效可靠的频谱感知技术是认知无线电得以发展的关键和前提。该文通过对基于二阶循环统计量检测方法的综合分析和研究,将该方法应用到认知无线电频谱空洞的检测当中,给出了利用二阶循环统计量实现对授权用户检测的具体实施方案。仿真试验结果表明,基于二阶循环统计量的频谱感知方法具有良好的检测性能,能够有效地完成对授权用户的检测。     

电容式湿度传感器结构优化

对圆筒形电容式湿度传感器进行合理的结构优化．依次改变极板的直径、长度、厚度、间距、个数等,利用有限元分析软件模拟上述条件下电容器极板的场强的分布,找到场强随这些参数的变化规律．分析结果发现,单层极板呈现出明显的边缘效应;随直径增大,边缘场强与内部场强的比值增大;极板越薄,边缘场强越小;适当加大极板长度,可减缓边缘场强增加的速率,但效果有限．多层极板,随间距增大,边缘场强与内部场强的比值增大,但总电容变化量减小;极板的间距应适当选取．对于多层极板,中间极板的场强有相互抵消的现象,故而可以适当减小中间极板的间距,以增加极板的个数,对测量有利．推荐了最佳尺寸．     

基于本体的装备领域信息集成方法研究

深入分析了我军武器装备信息化进程中存在的语义异构、数据不能有效共享等问题,研究了基于本体的几种信息集成方法,根据我军装备管理体制和机制的特点对混合方法进行了改进,最后给出了具体的实现技术.     

基于MonteCarlo模拟的快速有限笔束算法研究

提出一种基于Monte Carlo模拟的快速有限笔束算法(finite size pencil beams,FSPB),并根据有限笔束的核心思想,利用Monte Carlo模拟的多角度1cm×1cm野剂量分布数据,对不同入射角度的有限笔束的剂量分布数据进行直接矩阵存储,完全束的剂量分布基于原始数据的叠加得到.基于若干算例,比较分析了本算法计算结果与Monte Carlo直接模拟的实际剂量分布,其精度和速度达到预期效果.本算法为IMRT逆向计划过程的剂量计算又增加了一种算法选择.     

一类索赔额相依风险模型的研究

讨论了一类离散时间模型,包含了两种索赔:主索赔和由它产生的副索赔,得到了该模型下有限时间生存概率的递推公式.     

采用棉花模板制备生物形态Co_3O_4

以天然棉花为模板,经硝酸钴溶液浸渍后在自然气氛下高温煅烧得到具有纳米尺度、多孔结构的生物形态Co3O4纤维材料.研究表明:煅烧温度为600℃时,得到的Co3O4纤维不仅完全去除作为模板的棉花,而且还很好地保留了棉花的宏观形貌和微观结构特征.