检索结果-南通市图书馆

Using Highway Connections to Enable Deep Small-footprint LSTM-RNNs for Speech Recognition

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2019年第1期28卷 107-112页

作者： CHENG Gaofeng LI Xin YAN yonghong Key Laboratory of Speech Acoustics and Content Understanding Institute of Acoustics University of Chinese Academy of Sciences

long short-term memory RNNs(LSTMRNNs) have shown great success in the Automatic speech recognition(ASR) field and have become the state-ofthe-art acoustic model for time-sequence modeling ***, it is still difficult to train deep LSTM-RNNs while keeping the parameter number small. We use the highway connections between memory cells in adjacent layers to train a small-footprint highway LSTM-RNNs(HLSTM-RNNs), which are deeper and thinner compared to conventional LSTM-RNNs. The experiments on the Switchboard(SWBD) indicate that we can train thinner and deeper HLSTM-RNNs with a smaller parameter number than the conventional 3-layer LSTM-RNNs and a lower Word error rate(WER) than the conventional *** with the counterparts of small-footprint LSTMRNNs, the small-footprint HLSTM-RNNs show greater reduction in WER.

关键词： long short-term memory Highway connections Small-footprint Speech recognition

基于短周期密集台阵的广州—佛山地区地壳浅部三维S波速度结构研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

地球物理学报 2024年第4期67卷 1454-1470页

作者：高占永叶秀薇林吉焱段永红王力伟周铭刘巧霞广东省地震局中国地震局地震监测与减灾技术重点实验室广州510070 广东省地震局广东省防震减灾科技协同创新中心广州510070 重大工程灾害与控制教育部重点实验室城市地震安全实验室广州510070 中国地震局地球物理勘探中心郑州450002

广州—佛山地区位于珠三角经济区的核心地带,三条区域性断裂从中交错穿过.广州—佛山地区精细的地壳浅部三维S波速度结构,对于研究区内的城市规划建设、地震灾害评估、强地面运动模拟等具有重要意义.本文利用布设于广州—佛山地区短周... 详细信息

广州—佛山地区位于珠三角经济区的核心地带,三条区域性断裂从中交错穿过.广州—佛山地区精细的地壳浅部三维S波速度结构,对于研究区内的城市规划建设、地震灾害评估、强地面运动模拟等具有重要意义.本文利用布设于广州—佛山地区短周期密集地震台阵中的1104个台站记录到的连续波形数据,采用背景噪声互相关方法计算了台站对间的互相关函数并进一步提取到周期范围在0.1~5 s内的39488条高质量面波群速度频散曲线,然后通过基于射线追踪的面波直接反演方法计算得到了研究区内0.3~3 km深度的高分辨率三维S波速度结构.结果显示:研究区内地壳浅部S波速度横向差异显著,其中南部的珠江三角洲断陷盆地S波速度结构相对较为复杂,而北部的广花盆地内部S波速度结构则表现相对简单.研究区内的低速异常主要位于断裂附近,且大都位于断裂的下降盘.珠江三角洲内三水盆地东缘表现为马鞍状低速异常,向下最大延伸至2 km,低速体南北两侧边界与控盆断裂位置基本一致.广花盆地内部存在两个平行排列的高速异常,中间夹持一平行构造走向的低速异常,总体速度结构特征符合广花盆地为一复式向斜的地质构造背景.低速异常向下延伸至1.4 km深度处,可能指示了卷入向斜地层的最大埋深.沿广州—从化断裂发育条带状低速异常,与沿断裂形成的沉积地层有关.条带状异常在浅部分为两段,表明广州—从化断裂在历史上可能具有分段活动性.玉带公园周围被高速异常环绕,异常向上延伸至距地表约1.3 km处,结合研究区已有资料推测该高速异常可能为早期岩浆侵入在地壳浅部的反映.

关键词：密集台阵背景噪声成像地壳浅部 S波速度结构广州—佛山

Agglutinative Language Speech Recognition Using Automatic Allophone Deriving

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2016年第2期25卷 328-333页

作者： XU Ji PAN Jielin YAN yonghong The Key Laboratory of Speech Acoustics and Content Understanding Chinese Academy of Sciences

Agglutinative language involves agglutination extensively, which results in the significant pronunciation variations in different contexts. Therefore, it is a problem to use phoneme sets translated from their written forms as basic units for acoustic modeling, due to the incapability to capture the pronunciation variations in Large-vocabulary continuous speech recognition(LVCSR).This paper presented a novel approach called Automatic allophone deriving(AAD) to create allophone candidates without any linguistic prior knowledge. Furthermore, an enhanced approach AAD-LT is proposed in which longtime features are used in AAD approach. Experiments are conducted on three languages which contains two agglutinative ones and an analytic one. The experiments suggest that AAD long-time(AAD-LT) is very effective for the agglutinative languages in which more than 10% relative CER reduction is obtained.

关键词： Agglutinative language Large-vocabulary continuous speech recognition(LVCSR) Allophone Unsupervised

COVID-19 epidemic prediction and the impact of public health interventions: A review of COVID-19 epidemic models

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Infectious Disease Modelling 2021年第1期6卷 324-342页

作者： Yue Xiang yonghong Jia Linlin Chen Lei Guo Bizhen Shu Enshen long MOE Key Laboratory of Deep Earth Science and Engineering Institute of Disaster Management and ReconstructionSichuan UniversityChengduChina Chongqing Safety Engineering Institute Chongqing University of Science and TechnologyChongqingChina College of Architecture and Environment Sichuan UniversityChengduChina Key Laboratory of Birth Defects and Related Diseases of Women and Children West China Second Hospital of Sichuan UniversityChengduChina

The coronavirus disease outbreak of 2019(COVID-19)has been spreading rapidly to all corners of the word,in a very complex manner.A key research focus is in predicting the development trend of COVID-19 scientifically through mathematical *** conducted a systematic review of epidemic prediction models of COVID-19 and the public health intervention strategies by searching the Web of Science database.55 studies of the COVID-19 epidemic model were reviewed *** was found that the COVID-19 epidemic models were different in the model type,acquisition method,hypothesis and distribution of key input *** studies used the gamma distribution to describe the key time period of COVID-19 infection,and some studies used the lognormal distribution,the Erlang distribution,and theWeibull *** setting ranges of the incubation period,serial interval,infectious period and generation time were 4.9-7 days,4.41-8.4 days,2.3-10 days and 4.4-7.5 days,respectively,and more than half of the incubation periods were set to 5.1 or 5.2 *** models assumed that the latent period was consistent with the incubation *** models assumed that asymptomatic infections were infectious or pre-symptomatic transmission was possible,which overestimated the value of *** the prediction differences under different public health strategies,the most significant effect was in travel *** were different studies on the impact of contact tracking and social isolation,but it was considered that improving the quarantine rate and reporting rate,and the use of protective face mask were essential for epidemic prevention and *** input epidemiological parameters of the prediction models had significant differences in the prediction of the severity of the epidemic ***,prevention and control institutions should be cautious when formulating public health strategies by based on the prediction results of mathematical models.

关键词： COVID-19 Epidemic model Public health intervention Compartmental model Reproduction number

Distributed Spectrum Sharing Scheme for Multiuser Orthogonal Frequency-Division Multiplexing Cognitive Radio Networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2014年第1期11卷 79-91页

作者： YANG long KUO yonghong CHEN Jian ZHANG Hailin School of Telecommunications Engineering Xidian University Xi'an 710071 China

This paper presents a novel spec- trum sharing design aiming at optimising the performance of a Multiuser Orthogonal Freq- uency-Division Multiplexing （MU-OFDM） Co- gnitive Radio Network （CRN） that consists of multiple secondary Transmitter-Receiver （Tx-Rx） pairs. For most MU-OFDM systems, the Exc- lusive Subchannel Assignment （ESA） is an efficient resource allocation method. Noneth- eless, it is inappropriate for the network consi- dered in this paper, because subchannels shar- ing among secondary Tx-Rx pairs can further improve the system performance. We investi- gate the Weighted Sum Rate （WSR） maximi- zation problem under the Shared Subchannel Assignment （SSA）, where each subchannel is shared by multiple secondary Tx-Rx pairs. With Lagrangian duality technique, we decompose the original resource allocation problem into sev- eral sub-problems on each subchannel and pro- pose a duality-based suhchannel sharing ap- proach. For practical realisation in the cogni- tive systems without central control entity, a distributed duality-based WSR maximization scheme is presented. Simulation results mani- fest that the proposed scheme achieves sig- nificantly better performance than ESA duality scheme.

关键词： cognitive radio networks Lagr- angian duality multiuser orthogonal frequen- cy-division multiplexing spectrum sharing weight sum rate maximization

在线全文

学校读者我要写书评

暂无评论

神农架地区树轮蓝光强度对气候要素的响应

生态学报 2024年第14期44卷 6165-6173页

作者：郑永宏叶子阳陈城曾琦胡正生农舒涵武汉大学资源与环境科学学院武汉430079 湖北省气象局武汉430074

树轮在过去气候变化研究中发挥着难以替代的作用,在树木生长条件较为适宜地区传统的树轮宽度指标存在短板。树轮蓝光强度作为树轮密度的替代性指标,成为树轮-气候研究的重要载体。然而,树轮蓝光强度这一新兴的指标在亚热带地区的研究仍... 详细信息

树轮在过去气候变化研究中发挥着难以替代的作用,在树木生长条件较为适宜地区传统的树轮宽度指标存在短板。树轮蓝光强度作为树轮密度的替代性指标,成为树轮-气候研究的重要载体。然而,树轮蓝光强度这一新兴的指标在亚热带地区的研究仍十分不足。为进一步挖掘树轮蓝光强度在我国亚热带地区树轮气候学研究中的应用潜力,利用神农架地区树轮宽度、树轮早材蓝光强度、树轮晚材蓝光强度、树轮早晚材蓝光强度差以及巴东气象站资料,基于树轮气候学方法,分析了上述树轮指标与月降水量、月平均最低气温、月平均气温和月平均最高气温之间的相关关系,对比了不同树轮指标蕴含气候信号的能力。研究结果表明,与树轮宽度相比,神农架地区树轮蓝光强度蕴含更为丰富的气候信号,其中树轮晚材蓝光强度、树轮早晚材蓝光强度差能够很好反映8月平均气温变化。其中,在原序列上树轮早晚材蓝光强度差与8月气温的关系最为紧密,而在高频上树轮晚材蓝光强度与8月平均气温的关系则更为紧密。树轮蓝光强度与气温之间高频信号一致性的发现,有助于丰富树木生长条件较为适宜地区树轮气候学的研究,为进一步的过去气温重建工作提供参考和依据。

关键词：树轮蓝光强度响应 8月气温高频信号

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

手术患者超长住院日影响因素分析

中国病案 2024年第9期25卷 61-64页

作者：刘峰海何永宏重庆医科大学附属第一医院病案科重庆市400016

目的探讨手术超长住院的影响因素,为核心指标管理提供依据。方法以某三甲医院2019年-2023年住院手术患者作为研究对象,将住院天数大于30天的认定为超长住院病例,以性别、年龄等个人因素为匹配变量,按照1:3的比例进行倾向性得分匹配,通... 详细信息

目的探讨手术超长住院的影响因素,为核心指标管理提供依据。方法以某三甲医院2019年-2023年住院手术患者作为研究对象,将住院天数大于30天的认定为超长住院病例,以性别、年龄等个人因素为匹配变量,按照1:3的比例进行倾向性得分匹配,通过描述性统计分析、单因素分析、Logistic回归模型对再入院影响因素进行分析。结果手术超长住院患者比例随年份变化呈下降趋势,相关系数-0.41,P<0.001。Logistic回归分析结果显示急诊、其他医疗机构转入、常规手术、介入手术、无菌切口/愈合不良、感染切口/愈合良好、感染切口/愈合不良、有院内感染、术前住院7~13天、术前住院大于14天、出入院科室不一致、术后有并发症是手术超长住院的危险因素;2级手术与3级手术是手术超长住院的保护因素。结论超长住院日呈多因素影响,可通过术前检查院前完成、加强围手术期管理、探索多学科MDT讨论、加强监管等方式加强手术超长住院日的管理。

关键词：手术患者超长住院倾向性得分匹配影响因素

穿戴式长程动态心电监测仪在社区居家老年人群中的监测研究

在线全文

学校读者我要写书评

暂无评论

陆军军医大学学报 2024年第11期46卷 1316-1322页

作者：袁志权邬娜焦惠艳李成英吴龙聂朦许月瑶杨蕾王煜伍永红钟理李亚斐陆军军医大学(第三军医大学)军事预防医学系军队流行病学教研室重庆400038 沙坪坝区双碑社区卫生服务中心重庆400032 贵州医科大学公共卫生与健康学院环境污染与疾病监控教育部重点实验贵阳561113 九龙坡区疾病预防控制中心重庆400039 重庆医科大学附属第三医院心血管疾病中心重庆401120

目的对社区居家老年人群进行动态心电监测结果调查,并探讨穿戴式长程动态心电监测仪在社区居家老年人群中的适用性。方法于2021年11月至2023年6月在重庆市沙坪坝区双碑社区招募老年志愿者,采用单导联穿戴式动态心电记录仪进行连续7 d的... 详细信息

目的对社区居家老年人群进行动态心电监测结果调查,并探讨穿戴式长程动态心电监测仪在社区居家老年人群中的适用性。方法于2021年11月至2023年6月在重庆市沙坪坝区双碑社区招募老年志愿者,采用单导联穿戴式动态心电记录仪进行连续7 d的心电监测,描述设备穿戴中的不良反应、可接受度、监测时长、心电监测结果。严重心律失常事件包含频发房早、心房扑动、心房颤动(房颤)、频发室早、RR间期≥5 s心律失常事件。结果共416例研究对象纳入分析,年龄(71.2±6.6)岁,男性150人(36.1%);384例(92.3%)研究对象完成7 d佩戴,佩戴时长(159.2±29.4)h。179例(48.5%)研究对象穿戴心电监测设备无任何不适,175例(47.4%)佩戴部位皮肤瘙痒。监测结果显示,常见的心律失常依次为房性早搏(97.1%)、室性早搏(93.3%)、房性心动过速(84.6%)、心动过缓(46.6%)、频发房性早搏(15.1%)、室性心动过速(13.2%)、长RR间期(11.8%)等。其中29.1%的研究对象有严重心律失常事件,高龄(≥70岁)、有既往心脏疾病史的人群某些严重心律失常事件检出率较高。结论社区居家老年人群常见心律失常检出率较高,监测周期7 d可能较合适。

关键词：心律失常长程动态心电监测社区老年人群

In vivo auditory nerve stimulation with visible light

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2017年第5期10卷 77-84页

作者： Tian Guan Muqun Yang yonghong He Graduate School at Shenzhen Tsinghua University Shenzhen 518055P.R.China Tsinghua-Berkeley Shenzhen Institute Tsinghua University Shenzhen 518055P.R.China

Background:Infrared laser stimulation has been proposed as an innovative method to elicit an auditory nerve *** studies have focused on usi ng long-wavelength infrared(>980 nm)pulsod lasers with high water absoption *** paper sought to assts8 whether a short-wavelength laser(465 nm)with an absorption cofficient as low as 103 cm^(-1) would activate the auditory nerve and studied its potential ***:Optical compound action potentials(OCAPs)were recorded when synchronous triger laser pulses st imulate the cochlea before and after deafening,varying the pulse durations(from 8001us to 36001us)and the amount of radiant enengy(fom 18.05 mJ/cm^(2) to 107.91 mJ/cm^(2)).A thermal infrared imager was applied to monitor the tempenature change of the guinea pig ***:The results showed that pulsed laser stimulation at 465 nm could invoke OCAPs and had a similar waveform compared to the acoustical compound action *** amplitude of OCAPs had a poaitive correlation with the in-creasi ng laser peak power,while the latency of OCAPs showed a negative *** imager data showed that the temperature in thecochlea rose quickly by about 0.3℃ right after stimulating the cochlea and decreased quickly back to the initial temperature as the stimulation ***-clusions:This paper demonstrates that 465-nm laser st imulation can successfully induce OCAPs outside the cochlea,and that the amplitude and latency of the invoked OCAPs are highly affected by laser peak *** paper proposes that a photothermal efect might be the main mechanism for the auditory nerve response induced by short-wavelength laser stimulation.

关键词： Pulsed laser optical stimulation cochlear implant optical compound action potentials