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Chalcogenide Ovonic Threshold Switching Selector
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作者 Zihao Zhao Sergiu Clima +4 位作者 Daniele Garbin Robin Degraeve Geoffrey Pourtois Zhitang Song Min Zhu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第5期1-40,共40页
Today’s explosion of data urgently requires memory technologies capable of storing large volumes of data in shorter time frames,a feat unattain-able with Flash or DRAM.Intel Optane,commonly referred to as three-dimen... Today’s explosion of data urgently requires memory technologies capable of storing large volumes of data in shorter time frames,a feat unattain-able with Flash or DRAM.Intel Optane,commonly referred to as three-dimensional phase change memory,stands out as one of the most promising candidates.The Optane with cross-point architecture is constructed through layering a storage element and a selector known as the ovonic threshold switch(OTS).The OTS device,which employs chalcogenide film,has thereby gathered increased attention in recent years.In this paper,we begin by providing a brief introduction to the discovery process of the OTS phenomenon.Subsequently,we summarize the key elec-trical parameters of OTS devices and delve into recent explorations of OTS materials,which are categorized as Se-based,Te-based,and S-based material systems.Furthermore,we discuss various models for the OTS switching mechanism,including field-induced nucleation model,as well as several carrier injection models.Additionally,we review the progress and innovations in OTS mechanism research.Finally,we highlight the successful application of OTS devices in three-dimensional high-density memory and offer insights into their promising performance and extensive prospects in emerging applications,such as self-selecting memory and neuromorphic computing. 展开更多
关键词 Non-volatile memory Ovonic threshold switch(OTS) CHALCOGENIDE selector
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一种在紧框架下求解Analysis Dantzig-selector模型的快速算法
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作者 宋儒瑛 张春晓 《中央民族大学学报(自然科学版)》 2021年第1期5-9,共5页
Analysis Dantzig-selector模型是基于经典Dantzig-selector的l_(∞)限制的l_(1)分析模型。本文使用了紧框架下求解此模型的线性化交替方向乘子法,使得每个子问题都有显式解析解,并通过数值实验证明了该方法的有效可行性。
关键词 交替方向乘子法 Analysis Dantzig-selector模型 Dantzig-selector模型 线性化 紧框架
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Influence of spiral crystal selector on crystal orientation of single crystal superalloy 被引量:3
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作者 张如林 陈丽娜 +3 位作者 李重河 王宁 鲁雄刚 任忠鸣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1092-1095,共4页
To increase efficiency and improve performance, reducing cost and emissions, advanced single crystal Ni-based superalloys are required in aerospace propulsion and power generating gas turbines. With the development of... To increase efficiency and improve performance, reducing cost and emissions, advanced single crystal Ni-based superalloys are required in aerospace propulsion and power generating gas turbines. With the development of alloy, significant improvements in casting techniques have been achieved by introducing the directionally solidified (DS) casting process followed by single crystal (SX) technique. The deviation of preferred orientation of single crystal superalloys is one of the most important defects in casting. In directional solidification equipment with high temperature gradient, single crystal specimens of DZ417G alloy were prepared successfully by the modified Bridgeman method with spiral grain selector. The orientation was investigated by means of X-ray diffraction (XRD) and electron backscattered diffraction (EBSD).The results show that the crystal selector with a smaller angle can effectively reduce the deviation of preferred orientation. 展开更多
关键词 nickel-base superalloy directional solidification single crystal superalloy crystal orientation spiral grain selector
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一种解Dantzig-Selector模型的快速分解算法 被引量:1
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作者 张乾 何岸 何洪津 《杭州电子科技大学学报(自然科学版)》 2016年第1期97-102,共6页
基于增广拉格朗日法提出了一种快速分解算法求解Dantzig-Selector模型.与经典的乘子交替方向法相比,新算法的每个子问题都具有更简单易行的迭代格式.通过测试两种不同类型的随机数据,相应的数值计算结果表明,算法在CPU运行时间方面有较... 基于增广拉格朗日法提出了一种快速分解算法求解Dantzig-Selector模型.与经典的乘子交替方向法相比,新算法的每个子问题都具有更简单易行的迭代格式.通过测试两种不同类型的随机数据,相应的数值计算结果表明,算法在CPU运行时间方面有较明显的优势. 展开更多
关键词 Dantzig-selector模型 增广拉格朗日方法 乘子交替方向法 分解算法
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Effects of directional solidification parameters and crystal selector on microstructure of single crystal of Ni-base superalloys 被引量:5
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作者 LI Chong-he WEI Chao +3 位作者 ZHANG Ru-lin WANG Hong-bin REN Zhong-ming LU Xiong-gang 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第1期1-8,共8页
The single crystal of nickel-base super alloy is widely used for making turbine blades.The microstructure of the alloy,especially the deviation of preferred orientation of single crystal,possesses the most important e... The single crystal of nickel-base super alloy is widely used for making turbine blades.The microstructure of the alloy,especially the deviation of preferred orientation of single crystal,possesses the most important effects on the mechanical properties of the blades.In this study,the single crystal ingot and blade of DZ417G alloy are prepared by means of the spiral crystal selector as well as the directional solidification method,and the effect of the parameters(i.e.,the shape of samples,the withdrawal rate)and the structure of the spiral crystal selector on the formation of single crystal and the crystal orientation are investigated.This method can prepare not only the single crystal ingot with simple shape but also the single crystal blades with the complex shape,the simple with rod-shape can form the single crystal easily with a relatively fast withdrawal rate,but the blade with complex shape requires much slower withdrawal rate to form single crystal.The length of the crystal selector almost has no effect on the crystal orientation.However,the angle of selector plays an obvious role on the orientation;the selector with a smaller angle can effectively reduce the deviation of preferred orientation;the appropriate angle of selector to obtain optimal orientation is found to be around30°and the deviation of preferred orientation is about30°for this selector. 展开更多
关键词 DZ417G alloy high rapid solidification crystal orientation single crystal superalloy spiral grain selector
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Synthesis and Characterisation of Water-Soluble Carboxymethyl-Cyclodextrin Polymer as Capillary Electrophoresis Chiral Selector 被引量:3
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作者 Xue Yan SHI Rui Fang FAN +2 位作者 Yue Qin ZHANG Jun Ling GU Ruo Nong FU( College of Chemical Engineering and Material Science Beijing Institute of Technology, Beijing 100081) 《Chinese Chemical Letters》 SCIE CAS CSCD 2000年第1期69-70,共2页
The water-soluble carboxymethyl-cyclodextrin polymer (CM-CD polymer) was synthesized and used as capillary electrophoresis chiral selector. Verrapamil and thiopentorusodium were well separated using CM-CD polymer as c... The water-soluble carboxymethyl-cyclodextrin polymer (CM-CD polymer) was synthesized and used as capillary electrophoresis chiral selector. Verrapamil and thiopentorusodium were well separated using CM-CD polymer as chiral selector. 展开更多
关键词 Carboxymethyl-cyclodextrin polymer capillary electrophoresis chiral selector.
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Impact of variations of threshold voltage and hold voltage of threshold switching selectors in 1S1R crossbar array 被引量:2
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作者 Yu-Jia Li Hua-Qiang Wu +4 位作者 Bin Gao Qi-Lin Hua Zhao Zhang Wan-Rong Zhang He Qian 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第11期630-633,共4页
The impact of the variations of threshold voltage(V_(th))and hold voltage(V_(hold))of threshold switching(TS)selector in1 S1 R crossbar array is investigated.Based on ON/OFF state I–V curves measurements from a large... The impact of the variations of threshold voltage(V_(th))and hold voltage(V_(hold))of threshold switching(TS)selector in1 S1 R crossbar array is investigated.Based on ON/OFF state I–V curves measurements from a large number of Ag-filament TS selectors,V_(th)and V_(hold)are extracted and their variations distribution expressions are obtained,which are then employed to evaluate the impact on read process and write process in 32×321 S1 R crossbar array under different bias schemes.The results indicate that V_(th)and V_(hold)variations of TS selector can lead to degradation of 1 S1 R array performance parameters,such as minimum read/write voltage,bit error rate(BER),and power consumption.For the read process,a small V_(hold)variation not only results in the minimum read voltage increasing but it also leads to serious degradation of BER.As the standard deviation of V_(hold)and V_(th)increases,the BER and the power consumption of 1 S1 R crossbar array under 1/2 bias,1/3 bias,and floating scheme degrade,and the case under 1/2 bias tends to be more serious compared with other two schemes.For the write process,the minimum write voltage also increases with the variation of V_(hold)from small to large value.A slight increase of V_(th)standard deviation not only decreases write power efficiency markedly but also increases write power consumption.These results have reference significance to understand the voltage variation impacts and design of selector properly. 展开更多
关键词 RRAM threshold switching selector crossbar array variation
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Chiral Separation of Erythromycin as a New Chiral Selector on CE 被引量:1
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作者 Jing Guo HOU Tian Xi HE +4 位作者 Xiao Qian HAN Xin Zhen DU Xue Feng MAO Hua Ling DENG Jin Zhang GAO 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第3期280-282,共3页
Erythromycin as a new chiral selector was first used for chrial separation of four derivatives of biphenyldimethylester enantiomers on CE. The influence of pH, the chiral selector concentration and organic modifiers ... Erythromycin as a new chiral selector was first used for chrial separation of four derivatives of biphenyldimethylester enantiomers on CE. The influence of pH, the chiral selector concentration and organic modifiers were preliminarily studied. Experiments show that the erythromycin as chiral selector is useful to CE. 展开更多
关键词 ENANTIOMER ERYTHROMYCIN chiral selector CE.
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6-O-(Hydroxypropyltrimethylammonia)-β-cyclodextrin with Low Degree of Substitution: Convenient Preparation and its Application as a Chiral Selector in Capillary Electrophoresis 被引量:1
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作者 Ming Gang ZHAO Ai You HAO Jian LI Xiu Li LIN 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第3期407-410,共4页
A cationic cyclodextrin derivative 6-O-(hydroxypropyltrimethylammonia)-β-cyclodextrin (GTA-β-CD) with low degree of substitution was prepared through a convenient method in solid phase. The product could be used... A cationic cyclodextrin derivative 6-O-(hydroxypropyltrimethylammonia)-β-cyclodextrin (GTA-β-CD) with low degree of substitution was prepared through a convenient method in solid phase. The product could be used as a valuable chiral selector in the capillary electrophoresis (CE) separation of some acidic drug enantiomers such as naproxen, ofloxacin, ibuprofen and warfarin. 展开更多
关键词 6-O-(Hydroxypropyltrimethylammonia)-β-cyclodextrin capillary electrophoresis chiral selector.
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部分线性模型下Adaptive Dantzig Selector方法的渐近正态性
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作者 李丹丹 刘琳 《纯粹数学与应用数学》 2018年第2期154-159,共6页
变量选择是处理超高维数据过程中重要的部分.本文提出部分线性模型下ADS(Adaptive Dantzig Selector)方法,并证明其渐近正态性.通过数值模拟以及大众点评网数据,验证此方法的可行性以及高精准性.
关键词 超高维数据 部分线性模型 ADAPTIVE Dantzig selector 渐近正态性
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基于Dantzig Selector的迁移学习——应用于广义线性模型
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作者 孙飞 梁淑娜 《应用数学进展》 2022年第9期6779-6786,共8页
小样本高维度的n-p问题一直是统计学家的研究热点,不同于传统的变量选择的参数估计方法,在本篇论文中,我们应用迁移学习的相关知识,借用与需要预测数据相关但分布不同的数据,有效的帮助我们解决目标域数据参数的预测问题。我们提出了一... 小样本高维度的n-p问题一直是统计学家的研究热点,不同于传统的变量选择的参数估计方法,在本篇论文中,我们应用迁移学习的相关知识,借用与需要预测数据相关但分布不同的数据,有效的帮助我们解决目标域数据参数的预测问题。我们提出了一种新颖的基于Dantzig selector的两步迁移学习算法,在数值模拟中,我们验证了提出的迁移学习算法在广义线性模型以及不同的协方差数据设计中的稳健性和有效性,这表明提出的算法具有一定的实际应用价值。 展开更多
关键词 广义线性模型 Dantzig selector 迁移学习 两步迁移学习算法
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Multilayer doped-GeSe OTS selector for improved endurance and threshold voltage stability
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作者 Shiqing Zhang Bing Song +4 位作者 Shujing Jia Rongrong Cao Sen Liu Hui Xu Qingjiang Li 《Journal of Semiconductors》 EI CAS CSCD 2022年第10期97-102,共6页
Selector devices are indispensable components of large-scale memristor array systems.The thereinto,ovonic threshold switching(OTS)selector is one of the most suitable candidates for selector devices,owing to its high ... Selector devices are indispensable components of large-scale memristor array systems.The thereinto,ovonic threshold switching(OTS)selector is one of the most suitable candidates for selector devices,owing to its high selectivity and scalability.However,OTS selectors suffer from poor endurance and stability which are persistent tricky problems for applica-tion.Here,we report on a multilayer OTS selector based on simple GeSe and doped-GeSe.The experimental results show im-proving selector performed extraordinary endurance up to 1010 and the fluctuation of threshold voltage is 2.5%.The reason for the improvement may lie in more interface states which strengthen the interaction among individual layers.These develop-ments pave the way towards tuning a new class of OTS materials engineering,ensuring improvement of electrical perform-ance. 展开更多
关键词 ovonic threshold switch selector GeSe multilayer structure ENDURANCE stability
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Hollow fiber liquid-supported membrane technology for enantioseparation of racemic salbutamol by combinatorial chiral selectors
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作者 焦飞鹏 黄可龙 +2 位作者 彭霞辉 赵学辉 于金刚 《Journal of Central South University of Technology》 EI 2006年第1期39-43,共5页
Enantioseparation of salbutamol solute was carried out in liquid-supported membrane by using a polyvinylidene fluoride hollow-fiber module. The enantioselective transport of solute was facilitated by combinatorial chi... Enantioseparation of salbutamol solute was carried out in liquid-supported membrane by using a polyvinylidene fluoride hollow-fiber module. The enantioselective transport of solute was facilitated by combinatorial chiral selectors, which were dissolved in toluene organic solvent. The effects of molar concentration ratios of salbutamol to combinatorial chiral selectors, and the pH value of buffer solution on enantioseparation were investigated. The results show that when the molar concentration ratio is 2∶1∶1, the maximum separation factor and enantiomer excess are 1.49 and 19.74%, respectively, and the R-enantiomer flux is more than S-enantiomer; the pH value of buffer solution influences the performances of enantioseparartion obviously, and the appropriate range of pH value is 7.07.2. 展开更多
关键词 ENANTIOSEPARATION liquid-supported membrane hollow fiber combinatorial chiral selector racemic salbutamol
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多系统引导利器Acronis OS Selector
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作者 武金刚 《软件世界(PC任我行)》 2002年第6期45-47,共3页
关键词 ACRONIS OS selector 操作系统 多系统引导工具 计算机
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Ag-GST/HfO_(x)-based unidirectional threshold switching selector with low leakage current and threshold voltage distribution for high-density cross-point arrays
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作者 Kyoung-Joung Yoo Dae-Yun Kang +4 位作者 Nahyun Kim Ho-Jin Lee Ta-Hyeong Kim Taeho Kim Tae Geun Kim 《Rare Metals》 SCIE EI CAS CSCD 2024年第1期280-288,共9页
The use of electrochemical-metallization-based volatile threshold switching selectors in cross-point arrays has been widely explored owing to their high on-off ratios and simple structure.However,these devices are uns... The use of electrochemical-metallization-based volatile threshold switching selectors in cross-point arrays has been widely explored owing to their high on-off ratios and simple structure.However,these devices are unsuitable for cross-point architectures because of the difficulty in controlling the random filament formation that results in large fluctuations in the threshold voltage during operation.In this study,we investigated the unidirectional threshold transition characteristics associated with an Ag/GST/HfO_(x)/Pt-based bilayer selector and demonstrated the occurrence of a low leakage current(<1×10^(-11) A) and low distribution of the threshold voltage(Δ0.11 V).The bilayer structure could control the filament formation in the intermediate state through the insertion of an HfO_(x) tunneling barrier.By stacking a bilayer selector with NiO_(x)based resistive random-access memory,the leakage and programming currents of the device could be significantly decreased.For the crossbar array configuration,we performed equivalent circuit analysis of a one-selector oneresistor(1S1R) devices and estimated the optimal array size to demonstrate the applicability of the proposed structure.The maximum acceptable crossbar array size of the 1S1R device with the Ag/GST/HfO_(x)/Pt/Ti/NiO_(x)/Pt structure was 5.29×10^(14)(N^(2),N=2.3×10^(7)). 展开更多
关键词 selector device Tunneling barrier Threshold switching Sputtering 1S1R Cross-point array
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Microwave photonic sideband selector based on thin-film lithium niobate platform
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作者 丁跃迪 尚成林 +4 位作者 于文琦 马向 李少波 曾成 夏金松 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第3期55-59,共5页
We propose and demonstrate an integrated microwave photonic sideband selector based on the thin-film lithium niobate(TFLN)platform by integrating an electro-optic Mach-Zehnder modulator(MZM)and a thermo-optic tunable ... We propose and demonstrate an integrated microwave photonic sideband selector based on the thin-film lithium niobate(TFLN)platform by integrating an electro-optic Mach-Zehnder modulator(MZM)and a thermo-optic tunable flat-top microring filter.The sideband selector has two functions:electro-optic modulation of wideband RF signal and sideband selection.The microwave photonic sideband selector supports processing RF signals up to 40 GHz,with undesired sidebands effectively suppressed by more than 25 d B.The demonstrated device shows great potential for TFLN integrated technology in microwave photonic applications,such as mixing and frequency measurement. 展开更多
关键词 lithium niobate microwave photonics sideband selector
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Short-term prediction of ammonia levels in goose houses via combined feature selector and random forest
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作者 Jiande Huang Shahbaz Gul Hassan +1 位作者 Longqing Xu Shuangyin Liu 《International Journal of Agricultural and Biological Engineering》 SCIE 2023年第6期77-84,共8页
Ammonia concentration(NH3)is a dominant source of environmental pollution in geese housing and profoundly affects the healthy growth of geese.Accurately forecasting NH3 and analyzing its change trends in geese houses ... Ammonia concentration(NH3)is a dominant source of environmental pollution in geese housing and profoundly affects the healthy growth of geese.Accurately forecasting NH3 and analyzing its change trends in geese houses is crucial for the survival of geese.A novel forecasting model was proposed by combining feature selector(CFS)and random forest(RF)to improve the prediction accuracy of NH3 in this study.The developed model integrated two modules.First,combining mutual information(MI)and relief-F,we propose that CFS quantify each feature’s importance values and eliminate the low-relation or unrelated features.Second,a random forest model was built using K-fold cross-validation grid search algorithm(CVGS)to obtain the RF hyperparameters to predict NH_(3).The simulation results show that the prediction accuracy was improved when feature selection after quantification based on the CFS was used.The mean square error(MSE),root mean square error(RMSE),and mean absolute percent error(MAPE)for the proposed model were 0.5072,0.6583,and 2.88%,respectively.The NH_(3) prediction model(CFS-CVGS-RF)based on Combined Feature Selector,cross-validation grid search algorithm(CVGS),and Random Forest(RF)exhibited the best prediction accuracy and generalization performance compared with other parallel forecasting models and is a suitable and useful tool for predicting NH3 in geese houses.The results of the research can provide a reference for the machine learning method to monitor the dynamic changes of ammonia in goose houses. 展开更多
关键词 ammonia concentration prediction random forest combined feature selector goose houses
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适配变压器全档位切换暂态分析的有载分接开关电路模型构建 被引量:2
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作者 司马文霞 王大森 +3 位作者 杨鸣 李刚 厉璇 杨建琴 《高电压技术》 EI CAS CSCD 北大核心 2024年第2期478-488,I0001,I0002,共13页
有载分接开关(on-loadtap-changer,OLTC)是换流变压器的核心组件,其可靠切换过程关乎换流变的安全。然而目前国内在运特高压换流变用OLTC完全依赖进口,仿真获取OLTC不同运行状态的暂态特性数据是支撑OLTC关键电气参数设计与国产化制造... 有载分接开关(on-loadtap-changer,OLTC)是换流变压器的核心组件,其可靠切换过程关乎换流变的安全。然而目前国内在运特高压换流变用OLTC完全依赖进口,仿真获取OLTC不同运行状态的暂态特性数据是支撑OLTC关键电气参数设计与国产化制造的基础。经典的OLTC模型仅改变变压器变比或仅模拟单级档位切换过程,难以满足全档位电压调整与各级档位暂态特性数据同步获取的需求,导致OLTC设计优化、参数选型及故障分析缺乏足够的仿真数据支持。该文首先以真空OLTC为研究对象建立切换开关和极性开关等效电路模型,根据OLTC复杂的调压功能建立分层控制系统。其次,在PSCAD中搭建交流仿真系统,获取有载调压过程的暂态特性数据波形,与解析计算得到的电压和电流相比误差小于0.2%,证明该模型满足OLTC电磁暂态仿真研究的精度要求。最后,开展循环调压仿真,获得负载电压数据与波形。结果表明:该文提出的OLTC模型能够接收外部控制信号,进行全档位调压与极性转换仿真分析,能够为OLTC的调压研究、故障溯源分析和过渡电阻设计选型等提供基础模型。 展开更多
关键词 有载分接开关 极性开关 切换开关 恢复电压 承载电流
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分体分步式换流变有载分接开关研制 被引量:1
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作者 吕玮 陈羽 +3 位作者 孙超 王文杰 许元震 方太勋 《高压电器》 CAS CSCD 北大核心 2024年第1期154-162,共9页
特高压直流换流变压器有载分接开关长期承载满负荷运行的方波电流,切换电流di/dt大,熄弧困难,并且动作频繁,基本被国外企业垄断。文中首先针对特高压换流变传统有载分接开关无任何直接有效的电气量监测保护的“黑盒”难题,以及故障极易... 特高压直流换流变压器有载分接开关长期承载满负荷运行的方波电流,切换电流di/dt大,熄弧困难,并且动作频繁,基本被国外企业垄断。文中首先针对特高压换流变传统有载分接开关无任何直接有效的电气量监测保护的“黑盒”难题,以及故障极易引起换流变本体损坏,影响特高压直流工程可用率问题,提出了一种分体分步式有载分接开关拓扑,实现换流变有载分接开关核心部件分体布置以及分步闭环控制保护,并分析梳理了工程应用的电气应力;然后进行了切换开关、分接选择器和控制保护装置等关键核心部件的研制;最后搭建基于LC谐振法的切换试验系统,对所研制的分体分步式有载分接开关进行了切换试验、容量试验、温升试验以及绝缘试验。试验结果表明:所研制的分体分步式有载分接开关额定级电压4 kV,最大通过电流1600 A,切换开关外置,无油化设计,内部集成电气测量系统,切换过程能够实现分步操作控制和保护,避免故障扩大化,满足±800 kV/5000 A特高压直流输电换流变压器的工程应用需求。 展开更多
关键词 特高压直流输电 有载分接开关 切换开关 分接选择器 并联谐振
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基于提示学习的篇章级事件论元抽取方法研究
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作者 薛继伟 胡馨元 薛鹏杰 《计算机技术与发展》 2024年第6期125-131,共7页
事件论元抽取是指在自然语言文本中识别出事件论元及其对应的角色,是事件抽取的关键。传统事件论元抽取方法将抽取范围局限在单个句子中,在面对长文本中论元分散的情况时表现不佳。近年来,有研究者提出基于提示学习的篇章级事件论元抽... 事件论元抽取是指在自然语言文本中识别出事件论元及其对应的角色,是事件抽取的关键。传统事件论元抽取方法将抽取范围局限在单个句子中,在面对长文本中论元分散的情况时表现不佳。近年来,有研究者提出基于提示学习的篇章级事件论元抽取方法,能根据提示信息在输入文本中获取事件论元,实现事件论元抽取。然而现有基于提示学习的方法大多是由人工手动构建提示模板,模板结构固定容易导致论元抽取错误。针对以上不足,该文在以往基于提示学习研究的基础上,提出以文本触发词为关键实现模板自动构建的方法,并在输入文本中融入事件角色语义信息,使模型能更好地捕获文本语义特征,提高事件论元抽取准确率。在篇章级数据集RAMS上的实验结果表明,该模型在事件论元识别和事件论元分类的F1值分别达到54.3%和48.1%,相比最优的基准方法分别提升了1.8百分点和1.2百分点,验证了模型的有效性。 展开更多
关键词 论元抽取 提示学习 触发词 跨度选择器 预训练语言模型
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