采用二阶特征窗的语音盲分离方法

利用语音信号的短时平稳特性,提出了一种二阶特征窗语音盲分离方法。该方法采用新的联合差分相关矩阵白化算法去除有色噪声影响;用长度等于语音信号基音周期的等距特征窗连续分割预白化观测数据,在每个加窗的数据帧计算不同的时滞协方差矩阵。利用联合近似对角化时滞协方差矩阵集合得到旋转参数,最终达到语音信号的盲分离。该方法消除了有色噪声的影响,只需用到二阶信息就能很好地分离语音信号。仿真实验验证了该方法的有效性。     

《金融会计》教学必须走出的几个误区

《金融会计》课程的教学与近几年来金融业迅猛发展的趋势不相适应 ,在认识上、教学内容上和教学手段等方面存在种种误区     

一种基于椭圆曲线的部分盲签名方案

椭圆曲线数字签名实际上是基于乘法群的离散对数的数字签名在椭圆曲线上的模拟。本文讨论了部分盲签名的概念,并提出了两个基于椭圆曲线的部分盲签名方案,即单密钥部分盲签名方案和双密钥部分盲签名方案。该方案主要用于提高离线电子系统的效率和需要较短密钥的应用产品。     

A note on the mean residual life of a coherent system with a cold standby component

In this paper, we investigate the effect of a cold standby component on the mean residual life (MRL) of a system. When the system fails, a cold standby component is immediately put in operation. We particularly focus on the coherent systems in which, after putting the standby component into operation, the failure of the system is due to the next component failure. For these systems, we define MRL functions and obtain their explicit expressions. Also some stochastic ordering results are provided. Such systems include k-out-of-n systems. Hence, our results extend some results in literature.     

Believing Not Seeing: A Blind Phenomenology of Sexed Bodies

Vision plays a privileged role in social interaction and the construction of intersubjective reality. Given that one of sociology's tasks is to problematize the taken for granted, research that examines rarely foregrounded non‐visual modes of sensory perception is a powerful resource. This article draws on twenty‐seven interviews that explore blind people's perceptions of male and female bodies. I highlight several distinctive features of non‐visual sex attribution (salience, speed, and diachronicity), and argue that conceptions of sex as “self‐evident” primarily reflect visual perception. These findings suggest the need to explore the sociology of perception as a new approach to the sociology of the body, and more broadly highlight the role of sensory perception in the social construction of reality.     

周代籍礼“风土”考

《国语》所载周代"籍礼",是一种具有巫术特征的礼仪活动。其意义是疏导土壤中的阳气,使之顺利地播散。籍礼中,以瞽为首的乐官们所从事的"风土"活动,并不是韦昭注所以为的观察土壤中的气脉,而是通过乐舞鼓动风气,帮助土壤中的气脉顺利播散。它是这一土壤巫术中的重要组成部分。     

Availability of Mental Health Services for Individuals Who Are Deaf or Deaf-Blind

A survey of state mental health agencies found that a majority have no specific policy or procedure regarding how to provide mental health services to persons who are deaf or who are deaf-blind. Agency representatives report that staff lack knowledge of how to provide mental health services to persons who are deaf-blind and the agencies lack qualified interpreters. They recommend training for social workers and counselors to address best practices in working with people who are deaf-blind concerning communication methods and strategies, physical interaction, cultural issues, everyday life, sensory deprivation, ethics, use of an interpreter, and other general issues.     

Are We Making the Most of Learning From the Practice Placement?

It is almost universally accepted within social work education that placements are a defining feature of training and ‘… have a more profound and lasting impact than classroom teaching’. Consequently the placement is regarded as the signature pedagogy in social work education. However, it is also asserted that universities pay little attention to this aspect of teaching and concerns about a ‘significant level of disjunction between academic and practice learning’ are expressed.

The development of a new distance learning MA social work programme in which units are studied alongside part-time placements afforded opportunities for innovation in curriculum delivery, alongside increasing connections with learning on placement. Practice educators were invited to respond to an online mixed methods survey exploring their perceptions of the programme and views as to how greater integration of academic and practice learning can be achieved in social work education generally. Analysis of the results identified the important role which supervision with the practice educator can play in integrating learning on placement with the academic curriculum. The paper concludes that a greater focus on learning from practice may offer opportunities to maximise the learning potential of the placement as social work's signature pedagogy.     

我国股票市场的流动性风险溢价研究

我国股票预期回报率中包含显著的非流动性补偿和流动性风险溢价,而且非流动性补偿和流动性风险溢价更为显著地出现在流动性较差或者说价格冲击弹性较高的股票上.由于流动性水平和流动性风险在股票横截面上存在强相关性,使得代理流动性水平的非流动性指标能够抓住流动性风险的溢价效应.经典资本资产定价模型的价格风险敏感度对股票回报率缺乏解释力,意味着股票的风险溢价更多地来自对流动性风险的补偿,而非来自对单纯的价格风险的补偿.     

参差重复频率分析和设计

雷达工作于脉冲工作状态时不可避免的会出现盲速现象。可通过参差重频的方法减少盲速带来的影响。在推导频率响应的基础上,该文采用最优化设计的方法进行参差周期的设计,详细考虑并推导得到了最优化搜索中几个重要参数,给出了其解析表达式。仿真结果和频率响应图表明,该方法得到的参差周期能将慢速扩大到原来盲速的数倍以上,有效地减少了盲速的影响。