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基于ESN-RBF框架的声效模式检测 被引量:1
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作者 晁浩 董亮 《河南理工大学学报(自然科学版)》 CAS 北大核心 2019年第4期114-119,共6页
针对声效检测过程中基于帧的谱特征不能描述语音现象中固有的时间相关性和动态变化信息的问题,提出一种结合回声状态网络和径向基函数网络的声效检测方法。首先将声学观测特征序列输入到回声状态网络,根据回声状态网络中储备池的节点状... 针对声效检测过程中基于帧的谱特征不能描述语音现象中固有的时间相关性和动态变化信息的问题,提出一种结合回声状态网络和径向基函数网络的声效检测方法。首先将声学观测特征序列输入到回声状态网络,根据回声状态网络中储备池的节点状态对输入的观测矢量序列进行编码,从而将基于语音帧的声学观测矢量序列映射到高维编码空间;然后径向基函数网络被用于拟合每种声效模式编码后的概率密度函数;最后使用最小错误率贝叶斯决策方法来确定声效模式。对拥有5 000个孤立词的测试集进行声效检测试验,获得79.5%的识别精度。结果表明,所提方法可以有效获取语音帧之间的相关性信息,克服帧间独立假设的缺陷。 展开更多
关键词 声效检测 状态网络 储备池 径向基函数 支持向量机
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Outcome prediction in severe traumatic brain injury with transcranial Doppler ultrasonography 被引量:4
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作者 谭海斌 冯海龙 +2 位作者 高立达 黄光富 廖晓灵 《Chinese Journal of Traumatology》 CAS 2001年第3期156-160,共5页
Objective: To investigate the value of transcranial Doppler (TCD) ultrasonography in evaluating the outcome of severe traumatic brain injury and to correlate the TCD values with intracranial pressure (ICP) and cerebra... Objective: To investigate the value of transcranial Doppler (TCD) ultrasonography in evaluating the outcome of severe traumatic brain injury and to correlate the TCD values with intracranial pressure (ICP) and cerebral perfusion pressure (CPP) monitoring. Methods: A prospective study was conducted to evaluate the contribution of TCD ultrasonography to neurological outcome in a series of 96 severe traumatic brain injury patients. The quantitative variables of TCD ultrasonography included the mean blood flow velocity of the middle cerebral artery (MCA) and pulsatility index within the first 24 hours of admission. The ICP and CPP values were also recorded. Outcome in 6 months postinjury was evaluated using the Glasgow Outcome Scale (GOS 4 5 was considered as "good" and GOS 1 3 as "poor"). Results: The mean blood flow velocity of the MCA was larger than 40 cm/s in 30 (51%) patients with good outcome whereas it was less than 40 cm/s in 27 (73%) patients with poor outcome (P< 0.025 ). The mean PI in cases of good outcome (34 patients, 57%) was lower than 1.5 whereas in poor outcome (30 patients, 83%) was higher than 1.5 (P< 0.001 ). The correlations of ICP and CPP to pulsatility index were statistically significant (P< 0.01 ). Conclusions: TCD ultrasonography is valid in predicting the patients outcome of 6 months and correlates significantly with ICP and CPP values when it is performed in the first 24 hours of severe traumatic brain injury. 展开更多
关键词 Ultrasonography Doppler Brain injuries Intracranial pressure Cerebral perfusion pressure
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