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Teacher-Student Training Approach Using an Adaptive Gain Mask for LSTM-Based Speech Enhancement in the Airborne Noise Environment

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Chinese Journal of Electronics 2023年第4期32卷 882-895页

作者： HUANG Ping wu yafeng School of Power and Energy Northwestern Polytechnical University

Research on speech enhancement algorithms in the airborne environment is of great significance to the security of airborne systems. Recently, the research focus of speech enhancement has turned from conventional unsupervised algorithms, like the log minimum mean square error estimator(log-MMSE), to the state-ofthe-art masking-based long short-term memory(LSTM)method. However, each method has its characteristics and limitations, so they cannot always handle noise well. Besides, the requirements of clean speech and noise data for training a supervised speech enhancement model are difficult to satisfy in the real-world airborne ***, in this work, to fully utilize the advantages of those two different methods without any data restrictions,we propose a novel adaptive gain mask(AGM) based teacher-student training approach for speech enhancement. In our method, the AGM, as a robust learning target for the student model, is devised by incorporating the estimated ideal ratio mask from the teacher model into the procedure of the log-MMSE approach. To get an appropriate tradeoff between the two methods, we adaptively update the AGM using a recursive weighting coefficient. Experiments on the real airborne data show that the proposed AGM-based method outperforms other baselines in terms of all essential objective metrics evaluated in this paper.

关键词： Training Measurement Deep learning Adaptation models Atmospheric modeling Mean square error methods Interference

Dynamic formation mechanism of water droplet and induced surface discharges on silicone rubber composites

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High Voltage 2019年第1期4卷 59-64页

作者： Yong Liu yafeng wu Boxue Du Key Laboratory of Smart Grid of Ministry of Education(Tianjin University) School of Electrical and Information EngineeringTianjin UniversityTianjin 300072People's Republic of China

Wettability has become one of the most important factors influencing power equipment insulation system in coastal power grid,which can seriously threaten the safety of power *** paper aimed at numerical simulation and experimental investigation on dynamic formation mechanism of water droplet and induced surface discharges on silicone rubber composites under different AC voltages,considering the factors of surface tension and droplet *** results reveal that the spreading coefficient increases with increasing the electric field intensity from 1 to 5 kV/cm and with increasing the droplet volume from 10 to 50μ*** spreading coefficient shows a decreasing tendency when the surface tension increases from 29.3 to 61.0 mN/***,the maximum of surface electric field shows an increasing tendency under the condition of increasing both the droplet volume and the surface *** the basis of the physical model of droplet deformation,the electric field force and the surface tension play a significant role in the process of droplet ***,the experimental results are consistent with the simulation analysis,reflecting that the droplet deformation and the induced surface discharges mainly depend on two parameters:the droplet volume and the magnitude of applied voltage.

关键词： deformation surface mechanism

Review on application progress of federated learning model and security hazard protection

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Digital Communications and Networks 2023年第1期9卷 146-158页

作者： Aimin Yang Zezhong Ma Chunying Zhang Yang Han Zhibin Hu Wei Zhang Xiangdong Huang yafeng wu Hebei Engineering Research Center for the Intelligentization of Iron Ore Optimization and Ironmaking Raw Materials Preparation Processes North China University of Science and TechnologyTangshanHebeiChina Hebei Key Laboratory of Data Science and Application North China University of Science and TechnologyTangshanHebeiChina The Key Laboratory of Engineering Computing in Tangshan City North China University of Science and TechnologyTangshanHebeiChina Tangshan Intelligent Industry and Image Processing Technology Innovation Center North China University of Science and TechnologyTangshanHebeiChina College of Science North China University of Science and TechnologyTangshanHebeiChina College of Artificial Intelligence North China University of Science and TechnologyTangshanHebeiChina

Federated learning is a new type of distributed learning framework that allows multiple participants to share training results without revealing their data *** data privacy becomes more important,it becomes difficult to collect data from multiple data owners to make machine learning predictions due to the lack of data *** is forced to be stored independently between companies,creating“data silos”.With the goal of safeguarding data privacy and security,the federated learning framework greatly expands the amount of training data,effectively improving the shortcomings of traditional machine learning and deep learning,and bringing AI algorithms closer to our *** the context of the current international data security issues,federated learning is developing rapidly and has gradually moved from the theoretical to the applied *** paper first introduces the federated learning framework,analyzes its advantages,reviews the results of federated learning applications in industries such as communication and healthcare,then analyzes the pitfalls of federated learning and discusses the security issues that should be considered in applications,and finally looks into the future of federated learning and the application layer.

关键词： Data silos Machine learning Federated learning Privacy protection Learning framework

Electrofluorochromic imaging analysis of dopamine release from living PC12 cells with bipolar nanoelectrodes array

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Chinese Chemical Letters 2023年第1期34卷 578-582页

作者： Zhaoyan Tian Xiang Qin Fengying Shao Xiuxiu Li Zhi Wang Songqin Liu yafeng wu Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical ResearchState Key Laboratory of BioelectronicsSchool of Chemistry and Chemical EngineeringSoutheast UniversityNanjing 211189China State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China wuxi Institute of Inspection Testing and CertificationWuxi 214125China

The coupling of bipolar electrode(BPE)arrays and electrofluorochromic(EFC)imaging has exhibited great abilities in ***,the imaging resolution and analytical performance are hampered by the large size of the electrode and the rapid diffusion of EFC molecules on the electrode ***,to address the challenges,bipolar nanoelectrodes(BPn E)array and in situ immobilization strategy of EFC molecules were *** aluminum oxide(AAO)template-assisted Au nanoelectrodes array with high density was fabricated as BPn E array for high spatial imaging *** electrically polymerizing EFC molecules on the surface of single Au nanoelectrode,the rapid diffusion of EFC molecules on the electrode surface was not only avoided,but also realizing electrofluorescent imaging on an individual *** dopamine(DA)released from living PC12 cells as a model,the proposed strategy exhibited an ultra-high sensitivity for DA analysis with a detection limit of 0.45 nmol/L and the DA release amount from a single cell was calculated to be 0.13 pmol/***,the dynamic change of DA release under the drug stimulation from living PC12 cells could also be monitored.

关键词： Au nanoelectrodes array Bipolar nanoelectrodes Dopamine release Electrofluorochromic imaging Real-time monitoring

Observer-based State Feedback Control to Suppress Stick-slip Vibrations in Oil Well Drill-string

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International Journal of Plant Engineering and Management 2019年第2期24卷 65-72页

作者： FU Meng LI Jianghong wu yafeng wu Ruobin QIU Wenwei School of Power and Energy Northwestern Polytechnical University Xi′an 710072 China The 31st Research Institute of CASIC Beijing 100074 China Beijing Electric Power Corporation in Fangshan Beijing 102488 China Honors College Northwestern Polytechnical University Xi′an 710072 China

In drilling field, stick-slip vibrations of the drill-string are the main reason for the failure of the drilling system. To suppress the undesired stick-slip vibrations, an observer-based state feedback control method is proposed. The drilling system is described by a lumped parameter model including a Karnopp friction torque model. A state observer is designed to estimate the bit velocity in bottom hole and a state feedback controller is proposed to control the top drive velocity. By simulation, the performance of the control algorithm is demonstrated. Based on the control algorithm, a stick-slip vibration control system is developed. Test results show that the control system can effectively eliminate stick-slip vibrations of the drill-string and can be applied to the drilling field.

关键词： drill-string stick-slip vibration state observer state feedback controller test

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铁通西南环光通信网络的建设

中国铁路 2002年第2期 40-41页

作者：吴亚峰铁道通信信息有限责任公司网络部总经理北京100045

随着社会经济的进步和信息技术的发展,人们对通信的要求越来越高,业务类型正从传统的语音向视讯、多媒体等宽带数据业务发展.因此,根据干线网、城域网的发展特点建设传输网络,在满足语音、宽带数据业务增长的同时,还要对带宽批发、专线... 详细信息

随着社会经济的进步和信息技术的发展,人们对通信的要求越来越高,业务类型正从传统的语音向视讯、多媒体等宽带数据业务发展.因此,根据干线网、城域网的发展特点建设传输网络,在满足语音、宽带数据业务增长的同时,还要对带宽批发、专线出租等增值业务需求作出快速响应.

关键词：铁通公司西南环光通信网络 DWDM 光纤环网光分插设备 OADM

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万亿地方债务问题不会随风而逝

商业周刊（中文版） 2015年第6期 30-31页

作者： yafeng wu

本届政府创造性地来解决人们对3万多亿美元地方债务偿付问题的担心：以后再说。

关键词：债务问题地方债务创造性偿付美元

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利用水下平行光管测量水下相机成像分辨率

红外与激光工程 2023年第2期52卷 400-405页

作者：丁喆吴国俊吴亚风封斐刘博中国科学院西安光学精密机械研究所陕西西安710119 中国科学院大学北京100049

水下光学成像是重要的水下探测方式。现有水下相机成像检测方法受到水体本身以及测量方法的影响,难以准确进行成像分辨率检测。提出了基于水下平行光管的水下相机成像分辨率检测技术,通过在水中产生平行光束,直接对水下相机成像分辨率... 详细信息

水下光学成像是重要的水下探测方式。现有水下相机成像检测方法受到水体本身以及测量方法的影响,难以准确进行成像分辨率检测。提出了基于水下平行光管的水下相机成像分辨率检测技术,通过在水中产生平行光束,直接对水下相机成像分辨率进行检测。通过仿真得出:水下平行光管在水中可见光和空气中单波长的调制传递函数(Modulation Transfer Function, MTF)基本一致。利用这一结论,提出了水下平行光管空气中装调检测的方法。针对实验室所研制的一款水下相机开展实验测试,其在水中可见光与空气中635 m光源照明条件下的分辨率相同。实验结果表明,所提出的基于水下平行光管的水下相机成像分辨率检测方法可有效消除水体对分辨率测量的影响,实现水下相机成像分辨率的准确测量。

关键词：水下光学分辨率测量水下平行光管水下相机色差

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深埋TBM隧洞渗流动态演化机制

中南大学学报（自然科学版） 2016年第12期47卷 4231-4239页

作者：周亚峰苏凯伍鹤皋武汉大学水资源与水电工程科学国家重点实验室湖北武汉430072 长江勘测规划设计研究院湖北武汉430010

针对TBM隧洞动态掘进特征,采用与时间相关的动态边界条件模拟隧洞开挖、管片支护以及豆砾石灌浆等施工过程,结合管片衬砌在高(内、外)水压作用下渗透系数随着充排水过程而不断变化的特点,采用基于立方定理和管片接缝张开度的等效渗透系... 详细信息

针对TBM隧洞动态掘进特征,采用与时间相关的动态边界条件模拟隧洞开挖、管片支护以及豆砾石灌浆等施工过程,结合管片衬砌在高(内、外)水压作用下渗透系数随着充排水过程而不断变化的特点,采用基于立方定理和管片接缝张开度的等效渗透系数来反映结构变形对渗透系数的影响,进而提出管片衬砌的等效耦合模型,并将其在大型有限元软件ABAQUS中进行二次开发得以实现,开展深埋TBM隧洞从施工开挖、管片衬砌支护、充水运行到放空检修全过程周期的仿真模拟分析。研究结果表明:在TBM隧洞动态掘进过程中,洞周孔压先随着开挖掌子面的推进而降低,并在衬砌支护后有所回升,在距离隧洞5倍洞径范围内孔压变化剧烈,开挖影响范围在25倍洞径范围左右;在考虑管片衬砌渗透系数随充水、排水过程的逐渐变化特性后,隧洞渗流场体现了明显的动态变化特征,在充水和排水过程中衬砌外孔压均呈现先减小后增大的规律。

关键词： TBM隧洞渗流孔压时间效应二次开发