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A Tibetan Sentence Boundary Disambiguation Model Considering the Components on Information on Both Sides of Shad 被引量:1
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作者 Fenfang Li Hui Lv +3 位作者 Yiming Gao Dolha Yan Li Qingguo Zhou 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2023年第6期1085-1100,共16页
Sentence Boundary Disambiguation(SBD)is a preprocessing step for natural language processing.Segmenting text into sentences is essential for Deep Learning(DL)and pretraining language models.Tibetan punctuation marks m... Sentence Boundary Disambiguation(SBD)is a preprocessing step for natural language processing.Segmenting text into sentences is essential for Deep Learning(DL)and pretraining language models.Tibetan punctuation marks may involve ambiguity about the sentences’beginnings and endings.Hence,the ambiguous punctuation marks must be distinguished,and the sentence structure must be correctly encoded in language models.This study proposed a component-level Tibetan SBD approach based on the DL model.The models can reduce the error amplification caused by word segmentation and part-of-speech tagging.Although most SBD methods have only considered text on the left side of punctuation marks,this study considers the text on both sides.In this study,465669 Tibetan sentences are adopted,and a Bidirectional Long Short-Term Memory(Bi-LSTM)model is used to perform SBD.The experimental results show that the F1-score of the Bi-LSTM model reached 96%,the most efficient among the six models.Experiments are performed on low-resource languages such as Turkish and Romanian,and high-resource languages such as English and German,to verify the models’generalization. 展开更多
关键词 Sentence Boundary Disambiguation(SBD) punctuation marks ambiguity Bidirectional Long Short-Term Memory(Bi-LSTM)model
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Joint Design of ISAC Waveform Under PAPR Constraints
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作者 Chen Yating Wen Cai +4 位作者 Huang Yan Liang Le Li Jie Zhang Hui Hong Wei 《China Communications》 SCIE CSCD 2024年第7期186-211,共26页
In this paper,we formulate the precoding problem of integrated sensing and communication(ISAC)waveform as a non-convex quadratically constrained quadratic programming(QCQP),in which the weighted sum of communication m... In this paper,we formulate the precoding problem of integrated sensing and communication(ISAC)waveform as a non-convex quadratically constrained quadratic programming(QCQP),in which the weighted sum of communication multi-user interference(MUI)and the gap between dual-use waveform and ideal radar waveform is minimized with peak-toaverage power ratio(PAPR)constraints.We propose an efficient algorithm based on alternating direction method of multipliers(ADMM),which is able to decouple multiple variables and provide a closed-form solution for each subproblem.In addition,to improve the sensing performance in both spatial and temporal domains,we propose a new criteria to design the ideal radar waveform,in which the beam pattern is made similar to the ideal one and the integrated sidelobe level of the ambiguity function in each target direction is minimized in the region of interest.The limited memory Broyden-Fletcher-Goldfarb-Shanno(LBFGS)algorithm is applied to the design of the ideal radar waveform which works as a reference in the design of the dual-function waveform.Numerical results indicate that the designed dual-function waveform is capable of offering good communication quality of service(QoS)and sensing performance. 展开更多
关键词 ambiguity function integrated sensing and communication MIMO OFDM PAPR waveform design
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Trial application of the envelope method to the potential ambiguity problem
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作者 Li-Yuan Hu Yu-Shou Song 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第1期73-80,共8页
The optical potential ambiguity is a long-standing problem in the analysis of elastic scattering data.For a specific collid-ing system,ambiguous potential families can lead to different behaviors in the nearside and f... The optical potential ambiguity is a long-standing problem in the analysis of elastic scattering data.For a specific collid-ing system,ambiguous potential families can lead to different behaviors in the nearside and farside scattering components.By contrast,the envelope method can decompose the experimental data into two components with negative and positive deflection angles,respectively.Hence,a question arises as to whether the comparison between the calculated nearside(or farside)component and the derived positive-deflection-angle(or negative-deflection-angle)component can help analyze the potential ambiguity problem.In this study,we conducted a trial application of the envelope method to the potential ambiguity problem.The envelope method was improved by including uncertainties in the experimental data.The colliding systems of 16O+28Si at 215.2 MeV and 12C+12C at 1016 MeV were considered in the analyses.For each colliding system,the angular distribution experimental data were described nearly equally well by two potential sets,one of which is“surface transpar-ent”and the other is refractive.The calculated angular distributions were decomposed into nearside and farside scattering components.Using the improved envelope method,the experimental data were decomposed into the positive-deflection-angle and negative-deflection-angle components,which were then compared with the calculated nearside and farside components.The capability of the envelope method to analyze the potential ambiguities was also discussed. 展开更多
关键词 Elastic scattering Optical potential ambiguities Envelope method Nearside/farside decomposition
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A Combined Antenna Array Deployment with High Positioning Accuracy and Low Angular Measurement Error
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作者 Wangjie Chen Weiqiang Zhu +3 位作者 Zhenhong Fan Li Wu Yi He Yixiao Wang 《Journal of Beijing Institute of Technology》 EI CAS 2024年第2期141-154,共14页
In this paper,an antenna array composed of circular array and orthogonal linear array is proposed by using the design of long and short baseline“orthogonal linear array”and the circular array ambiguity resolution de... In this paper,an antenna array composed of circular array and orthogonal linear array is proposed by using the design of long and short baseline“orthogonal linear array”and the circular array ambiguity resolution design of multi-group baseline clustering.The effectiveness of the antenna array in this paper is verified by sufficient simulation and experiment.After the system deviation correction work,it is found that in the L/S/C/X frequency bands,the ambiguity resolution probability is high,and the phase difference system error between each channel is basically the same.The angle measurement error is less than 0.5°,and the positioning error is less than 2.5 km.Notably,as the center frequency increases,calibration consistency improves,and the calibration frequency points become applicable over a wider frequency range.At a center frequency of 11.5 GHz,the calibration frequency point bandwidth extends to 1200 MHz.This combined antenna array deployment holds significant promise for a wide range of applications in contemporary wireless communication systems. 展开更多
关键词 antenna array deployment ambiguity resolution phase consistency angle measurement error positioning error
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Therapeutic endoscopic retrograde cholangiopancreatography in a patient with asplenia-type heterotaxy syndrome:A case report
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作者 Yu-Yan Zhang Jiang Ruan Yan Fu 《World Journal of Gastrointestinal Surgery》 SCIE 2024年第11期3578-3583,共6页
BACKGROUND Asplenia-type heterotaxy syndrome(HS)is rare and refers to visceral malposition and dysmorphism.It is associated with a high infant mortality rate due to cardiac anomalies,and related digestive endoscopic i... BACKGROUND Asplenia-type heterotaxy syndrome(HS)is rare and refers to visceral malposition and dysmorphism.It is associated with a high infant mortality rate due to cardiac anomalies,and related digestive endoscopic interventions are poorly understood.With the improved long-term prognosis of these individuals after modern cardiac surgery,intra-abdominal anomalies have become increasingly significant.CASE SUMMARY Herein,we report successful endoscopic retrograde cholangiopancreatography(ERCP)in a 14-year-old male with asplenia-type HS that involved unique imaging findings and technical difficulties.His anatomic anomalies included complex congenital heart disease,midline liver placement,an absent spleen,a left-sided inferior vena cava,and dextroposition of the stomach and pancreas.He suffered from choledocholithiasis with obstructive jaundice,and the stone was successfully extracted with a basket following endoscopic papillary balloon dilation.CONCLUSION Although anatomic anomalies in HS increase the degree of technical difficulty when performing ERCP,they can be safely managed by experienced endosco-pists,as illustrated by the present case.Identifying these variations with imaging modalities and being aware of them before initiating an invasive intervention are crucial to preventing potential complications. 展开更多
关键词 HETEROTAXY ASPLENIA Situs ambiguous Endoscopic retrograde cholangiopan-creatography Case report
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Low-Complexity Integrated Super-Resolution Sensing and Communication with Signal Decimation and Ambiguity Removal
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作者 DAI Qianglong ZHOU Zhiwen +3 位作者 XIAO Zhiqiang ZENG Yong YANG Fei CHEN Yan 《ZTE Communications》 2024年第3期48-55,共8页
Integrated sensing and communication(ISAC)is one of the main usage scenarios for 6G wireless networks.To most efficiently utilize the limited wireless resources,integrated super-resolution sensing and communication(IS... Integrated sensing and communication(ISAC)is one of the main usage scenarios for 6G wireless networks.To most efficiently utilize the limited wireless resources,integrated super-resolution sensing and communication(ISSAC)has been recently proposed to significantly improve sensing performance with super-resolution algorithms for ISAC systems,such as the Multiple Signal Classification(MUSIC)algorithm.However,traditional super-resolution sensing algorithms suffer from prohibitive computational complexity of orthogonal-frequency division multiplexing(OFDM)systems due to the large dimensions of the signals in the subcarrier and symbol domains.To address such issues,we propose a novel two-stage approach to reduce the computational complexity for super-resolution range estimation significantly.The key idea of the proposed scheme is to first uniformly decimate signals in the subcarrier domain so that the computational complexity is significantly reduced without missing any target in the range domain.However,the decimation operation may result in range ambiguity due to pseudo peaks,which is addressed by the second stage where the total collocated subcarrier data are used to verify the detected peaks.Compared with traditional MUSIC algorithms,the proposed scheme reduces computational complexity by two orders of magnitude,while maintaining the range resolution and unambiguity.Simulation results verify the effectiveness of the proposed scheme. 展开更多
关键词 ISSAC sparse decimation range ambiguity two-stage approach
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Translation Strategies of Ambiguity in English Language and Literature
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作者 Ying Gao 《Journal of Contemporary Educational Research》 2024年第2期138-143,共6页
The translation of English language and literary works has always been crucial for cross-cultural communication.However,a key challenge in translating such works is the accurate communication of ambiguity,which refers... The translation of English language and literary works has always been crucial for cross-cultural communication.However,a key challenge in translating such works is the accurate communication of ambiguity,which refers to expressions deliberately used in English texts with unclear meanings.These expressions are often poetic and carry deep symbols and implications,adding a unique charm to literary works.This article explores the manifestations of ambiguity in English language and literature and the translation strategies that can be employed to optimize the translation of ambiguity in the English language and literature. 展开更多
关键词 ENGLISH Language and literature AMBIGUITY TRANSLATION
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Optimal Insurance with Background Risk under the Ambiguity and Belief Heterogeneity Structure
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作者 Xiaohan Wang 《Journal of Applied Mathematics and Physics》 2024年第6期2160-2171,共12页
In this paper, we discuss the optimal insurance in the presence of background risk while the insured is ambiguity averse and there exists belief heterogeneity between the insured and the insurer. We give the optimal i... In this paper, we discuss the optimal insurance in the presence of background risk while the insured is ambiguity averse and there exists belief heterogeneity between the insured and the insurer. We give the optimal insurance contract when maxing the insured’s expected utility of his/her remaining wealth under the smooth ambiguity model and the heterogeneous belief form satisfying the MHR condition. We calculate the insurance premium by using generalized Wang’s premium and also introduce a series of stochastic orders proposed by [1] to describe the relationships among the insurable risk, background risk and ambiguity parameter. We obtain the deductible insurance is the optimal insurance while they meet specific dependence structures. 展开更多
关键词 Optimal Insurance Monotone Hazard Ratio Order Smooth Ambiguity Model Background Risk Belief Heterogeneity Structure
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基于Radon-Ambiguity变换的多分量LFM信号检测与参数估计 被引量:12
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作者 刘爱芳 朱晓华 +1 位作者 陆锦辉 刘中 《南京理工大学学报》 EI CAS CSCD 北大核心 2004年第4期409-413,共5页
介绍了Radon -Ambiguity变换 (RAT)的定义和基本性质 ,结合解线调技术提出了一种基于RAT的线性调频 (LFM )信号检测与参数估计方法 ,该方法能用较少的计算量完成对LFM信号的检测与参数估计。为解决多分量条件下LFM信号分量之间交叉项的... 介绍了Radon -Ambiguity变换 (RAT)的定义和基本性质 ,结合解线调技术提出了一种基于RAT的线性调频 (LFM )信号检测与参数估计方法 ,该方法能用较少的计算量完成对LFM信号的检测与参数估计。为解决多分量条件下LFM信号分量之间交叉项的影响 ,基于逐次消去思想 ,提出了一种基于RAT的多分量LFM信号检测与参数估计算法 ,它可以有效地解决强度相差较大的多分量LFM信号的检测和参数估计问题。仿真实验结果验证了该算法的有效性。 展开更多
关键词 Radon—Ambiguity变换 线性调频信号 参数估计
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Method for integer ambiguity resolution in GPS network RTK 被引量:5
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作者 潘树国 王庆 +1 位作者 柯福阳 邓健 《Journal of Southeast University(English Edition)》 EI CAS 2009年第4期491-495,共5页
A method for integer ambiguity resolution in the global positioning system (GPS) multi-reference station network real time kinematic (RTK) is proposed. First, the barycenter of the triangle of reference stations f... A method for integer ambiguity resolution in the global positioning system (GPS) multi-reference station network real time kinematic (RTK) is proposed. First, the barycenter of the triangle of reference stations for ambiguity resolution is taken as a reference point. The satellite which has the largest elevation angle with the reference point is selected as a reference satellite. The parameters for constructing the weight matrix of carrier phase observation and the criteria for checking the correctness of integer ambiguity resolution of a network are obtained. Then, the wide ambiguity is calculated by a linear combination method of dualband observation. And the LI ambiguity is obtained by a nonionosphere combination method. The Kalman filter is introduced to refine the floating-point solution of ambiguity and estimate the real-time tropospheric delay. Finally, the cofactor matrix of ambiguity is de-correlated by Z-transformation to reduce the searching space of the integer ambiguity solution and improve the efficiency of the least-squares ambiguity decorrelation adjustment (LAMBDA) algorithm. The experimental results show that this method can reliably obtain the integer ambiguity solution among multi-reference stations with 40 epochs. 展开更多
关键词 network real time kinematic AMBIGUITY troposphere: reference satellite least-squares ambiguity decorrelation adjustment
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新截获模型下的对称三角LFMCW信号的检测与参数估计 被引量:6
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作者 朱健东 冯新扬 +1 位作者 唐江 赵拥军 《信号处理》 CSCD 北大核心 2013年第6期697-704,共8页
针对现有参数估计方法需要以信号的调频周期起点为截获时间起点的假设,结合"连续波"信号的特点和电子侦察的实际,建立新的对称三角线性调频连续波(STLFMCW)信号截获模型,提出了一种STLFMCW信号检测与参数估计方法。该方法在... 针对现有参数估计方法需要以信号的调频周期起点为截获时间起点的假设,结合"连续波"信号的特点和电子侦察的实际,建立新的对称三角线性调频连续波(STLFMCW)信号截获模型,提出了一种STLFMCW信号检测与参数估计方法。该方法在分析多周期STLFMCW信号模糊函数的基础上,利用Radon-Ambiguity变换(RAT)估计信号的调频斜率并确定分数阶傅里叶变换(FRFT)的最优阶数,根据截获模型下信号新的时间频率关系,再通过相应阶数上FRFT估计调制周期、调制带宽和载频。与现有方法相比,该方法克服了对信号截获时间起点限制,只需截获信号包含至少两个完整的正调频部分或负调频部分就可估计出信号的各个参数。蒙特卡罗仿真实验表明,本文的参数估计方法在低信噪比下具有很好的鲁棒性。 展开更多
关键词 对称三角线性调频连续波 信号截获模型 参数估计 分数阶傅里叶变换 Radon—Ambiguity变换
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分级计算迭代在Radon-Ambiguity变换和分数阶Fourier变换对chirp信号检测及参数估计的应用 被引量:18
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作者 郭斌 张红雨 《电子与信息学报》 EI CSCD 北大核心 2007年第12期3024-3026,共3页
该文在分析Radon-Ambiguity变换(RAT)和分数阶Fourier变换对chirp信号的检测和参数估计的基础上,建立了多分量chirp信号检测和参数估计系统模型,提出了分级计算迭代方法,大大减少了计算量,提高了运算速度。
关键词 分数阶FOURIER变换 Radon—ambiguity变换 CHIRP信号
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REGULARIZATION APPROACH FOR FAST INTEGER AMBIGUITY RESOLUTION OF MEDIUM-LONG BASELINE GPS NETWORK RTK 被引量:4
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作者 罗孝文 欧吉坤 袁运斌 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第3期235-242,共8页
An improved method based on the Tikhonov regularization principle and the precisely known reference station coordinate is proposed to design the regularized matrix. The ill-conditioning of the normal matrix can be imp... An improved method based on the Tikhonov regularization principle and the precisely known reference station coordinate is proposed to design the regularized matrix. The ill-conditioning of the normal matrix can be improved by the regularized matrix. The relative floating ambiguity can be computed only by using the data of several epochs. Combined with the LAMBDA method, the new approach can correctly and quickly fix the integer ambiguity and the success rate is 100% in experiments. Through using measured data sets from four mediumlong baselines, the new method can obtain exact ambiguities only by the Ll-frequency data of three epochs. Compared with the existing methods, the improved method can solve the ambiguities of the medium-long baseline GPS network RTK only using L1-frequency GPS data. 展开更多
关键词 GPS network RTK integer ambiguity fast resolution
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ALGORITHM FOR AMBIGUITY RESOLUTION IN RANGE AND VELOCITY 被引量:1
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作者 张弓 朱兆达 吕波 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2001年第2期219-223,共5页
For enhancing performances and increasing functions of PD radar, High PRF, medium PRF and low PRF are commonly applied into system ambiguity appeared in range and velocity in some PRF. Based on clustering, a slidin... For enhancing performances and increasing functions of PD radar, High PRF, medium PRF and low PRF are commonly applied into system ambiguity appeared in range and velocity in some PRF. Based on clustering, a sliding window correlator algorithm for resolving the radar object ambiguity in range and velocity is described. Slide window algorithm is a searching algorithm. The probability of ambiguity resolution for targets and the computational efficiency are discussed. The relations between the probability of ambiguity resolution of this algorithm and PRF, the range of interest, and the width of sliding window are analyzed. Simulational results are also given. 展开更多
关键词 PD radar ambiguity resolution sliding window CLUSTERING
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基于Radon变换的LFM信号检测与参数估计 被引量:6
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作者 于媛 《现代防御技术》 北大核心 2013年第1期136-141,共6页
提出了一种基于RAT法和RWT法的快速算法,研究噪声环境中线性调频信号的检测以及参数估计问题。该方法对信号的检测通过一维搜索完成,同时对调频率识别比较准确,在此基础上,通过窄带通滤波器对LFM信号去除大部分的噪声能量。和其他基于... 提出了一种基于RAT法和RWT法的快速算法,研究噪声环境中线性调频信号的检测以及参数估计问题。该方法对信号的检测通过一维搜索完成,同时对调频率识别比较准确,在此基础上,通过窄带通滤波器对LFM信号去除大部分的噪声能量。和其他基于二维时频分析工具的算法相比,降低了计算的复杂度,其实现更为简便。最后通过计算机仿真验证了该方法的有效性。 展开更多
关键词 线性调频信号 Radon—Wigner变换 Radon—Ambiguity变换
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机动目标速度和加速度联合分辨力 被引量:1
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作者 李文臣 李宏 +1 位作者 杨会民 王凌艳 《兵工学报》 EI CAS CSCD 北大核心 2013年第10期1243-1249,共7页
基于Radon-Wigner变换(RWT)方法分析机动目标速度和加速度多普勒分辨与提取问题。给出了机动目标的脉冲多普勒雷达回波模型和傅里叶变换处理方法。将RWT方法应用于机动目标回波参数估计,给出了RWT输出的泰勒解析表达式、速度和加速度独... 基于Radon-Wigner变换(RWT)方法分析机动目标速度和加速度多普勒分辨与提取问题。给出了机动目标的脉冲多普勒雷达回波模型和傅里叶变换处理方法。将RWT方法应用于机动目标回波参数估计,给出了RWT输出的泰勒解析表达式、速度和加速度独立分辨表达式和联合分辨表达式,研究表明,速度和加速度的联合分辨条件为运动参数不同引起的路径偏差大于1/2个波长。对傅里叶变换、Radon-ambiguity变换(RAT)和RWT方法进行了分辨力性能仿真比较,表明RWT具有较强的速度和加速度分辨力,验证了速度和加速度联合分辨条件。 展开更多
关键词 信息处理技术 脉冲多普勒 Radon—Wigner变换 Radon—ambiguity变换 加速度分辨力 速度和加速度联合分辨力
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从不确定性到模糊性:人类选择行为不确定性理论的演进及其展望 被引量:1
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作者 高宇 侯小娜 孙曰瑶 《山东行政学院学报》 2012年第1期63-68,共6页
选择行为理性与非理性的理论之争本质上是相融合的。导致"非理性"行为的主要因素就是选择行为的不确定性。关于不确定性的理论研究至今没有统一定论,从期望效用理论到信息不对称,再到行为经济学、实验经济学的决策心理学方法... 选择行为理性与非理性的理论之争本质上是相融合的。导致"非理性"行为的主要因素就是选择行为的不确定性。关于不确定性的理论研究至今没有统一定论,从期望效用理论到信息不对称,再到行为经济学、实验经济学的决策心理学方法,无不涉及到选择行为不确定性问题。比较各种不确定性理论,以可度量性和信息完备性两个维度将不确定性划分为四种类型,并在此基础上提出Ellsberg-Zhang悖论。研究发现,决策成本越高,选择行为面临的不确定性就越大;从降低选择行为成本的角度做深入研究是未来不确定性理论的一个可能发展方向。 展开更多
关键词 选择行为 不确定性 AMBIGUITY 选择成本
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Ambiguity in our daily language usage in both English and Chinese 被引量:1
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作者 雷春林 《Sino-US English Teaching》 2008年第1期9-14,44,共7页
Ambiguity is a unique linguistic feature and is caused by many factors. This paper first introduces the definitions of ambiguity and then mainly illustrates ambiguity in our daily language usage in both English and Ch... Ambiguity is a unique linguistic feature and is caused by many factors. This paper first introduces the definitions of ambiguity and then mainly illustrates ambiguity in our daily language usage in both English and Chinese from phonetic level and syntactic level. People can learn the relationships among those levels and grasp the rule of learning language. Thus, people can realize the complexity and importance of using language and know that it is not easy to express ideas accurately. 展开更多
关键词 AMBIGUITY phonetic level syntactic level daily language usage
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“万花筒”的迷思——散论实验艺术中的“不确定性” 被引量:1
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作者 段鹏 《创作与评论》 2014年第22期98-101,共4页
"Indeterminacy(不确定性)"是美国当代文学批评家依哈布·哈桑(Ihab Hassan)对后现代主义基本特征的概括性描述,它揭示了后现代主义审美特征的精神品格。这一复杂的现象具有多重的所指:含混(Ambiguity)、不连续性(Discont... "Indeterminacy(不确定性)"是美国当代文学批评家依哈布·哈桑(Ihab Hassan)对后现代主义基本特征的概括性描述,它揭示了后现代主义审美特征的精神品格。这一复杂的现象具有多重的所指:含混(Ambiguity)、不连续性(Discontinuity)、异端(Heterodoxy)、多元性(Pluralism)、随意性(Randomness)、叛逆(Revolt)、变态(Perversion)、变形(Deformation)。延伸在艺术创作领域,后现代美学或艺术敏锐地承袭了这种游移的特性。 展开更多
关键词 实验艺术 当代文学批评 现代美学 不连续性 创作领域 哈桑 AMBIGUITY 审美特征 元性 艺术语言
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英语歧义句及其结构分析 被引量:1
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作者 李荣宝 《外国语言文学》 1990年第Z2期13-15,共3页
一、定义歧义(ambiguity)是自然语言的一种普遍现象,它指的是一个语句具有两种以上可穷尽的、具体的、独立的释义。歧义的多义性和含糊(vagueness)的多义性不同,后者指的是一个语句,由于缺乏一个具体的、明确的意义,即语句没有给交际对... 一、定义歧义(ambiguity)是自然语言的一种普遍现象,它指的是一个语句具有两种以上可穷尽的、具体的、独立的释义。歧义的多义性和含糊(vagueness)的多义性不同,后者指的是一个语句,由于缺乏一个具体的、明确的意义,即语句没有给交际对象提供足够的信息,而产生的多种释义。这种多义常带有释义者对语句解释的主观性,是难以穷尽的。比较:1.1 He ran to the girl with flowers. 展开更多
关键词 歧义句 修饰成分 交际对象 结构分析 ambiguity 动词性 句法结构 主导词 格结构 及物动词
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