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Assessing Disagreement and Tolerance of Misclassification of Satellite-derived Land Cover Products Used in WRF Model Applications 被引量:6
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作者 高浩 贾根锁 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2013年第1期125-141,共17页
As more satellite-derived land cover products used in the study of global change, especially climate modeling, assessing their quality has become vitally important. In this study, we developed a distance metric based ... As more satellite-derived land cover products used in the study of global change, especially climate modeling, assessing their quality has become vitally important. In this study, we developed a distance metric based on the parameters used in weather research and forecasting (WRF) to characterize the degree of disagreement among land cover products and to identify the tolerance for misclassification within the International Geosphere Biosphere Programme (IGBP) classification scheme. We determined the spatial degree of disagreement and then created maps of misclassification of Moderate Resolution Imaging Spectoradiometer (MODIS) products, and we calculated overall and class-specific accuracy and fuzzy agreement in a WRF model. Our results show a high level of agreement and high tolerance of misclassification in the WRF model between large-scale homogeneous landscapes, while a low level of agreement and tolerance of misclassification appeared in heterogeneous landscapes. The degree of disagreement varied significantly among seven regions of China. The class-specific accuracy and fuzzy agreement in MODIS Collection 4 and 5 products varied significantly. High accuracy and fuzzy agreement occurred in the following classes: water, grassland, cropland, and barren or sparsely vegetated. Misclassification mainly occurred among specific classes with similar plant functional types and low discriminative spectro-temporal signals. Some classes need to be improved further; the quality of MODIS land cover products across China still does not meet the common requirements of climate modeling. Our findings may have important implications for improving land surface parameterization for simulating climate and for better understanding the influence of the land cover change on climate. 展开更多
关键词 land cover MODIS disagreement TOLERANCE fuzzy agreement
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Disagreement and Antagonism in Signed Networks: A Survey
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作者 Yuxin Wu Deyuan Meng Zheng-Guang Wu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2022年第7期1166-1187,共22页
Signed networks refer to a class of network systems including not only cooperative but also antagonistic interactions among nodes.Due to the existence of antagonistic interactions in signed networks,the agreement of n... Signed networks refer to a class of network systems including not only cooperative but also antagonistic interactions among nodes.Due to the existence of antagonistic interactions in signed networks,the agreement of nodes may not be established,instead of which disagreement behaviors generally emerge.This paper reviews several different disagreement behaviors in signed networks under the single-integrator linear dynamics,where two classes of topologies,namely,the static topology and the dynamic topology,are considered.For the static signed networks with the adjacency weights as(time-varying)scalars,we investigate the convergence behaviors and the fluctuation behaviors with respect to fixed topologies and switching topologies,respectively,and give some brief introductions on the disagreement behaviors of general time-varying signed networks.Correspondingly,several classes of behavior analysis approaches are also provided.For the dynamic signed networks with the adjacency weights as transfer functions or linear time-invariant systems,we show the specific descriptions and characteristics of them such that the disagreement behaviors can be obtained by resorting to the derived static signed graphs.Furthermore,we give their applications to the behavior analysis of static signed networks in the presence of high-order dynamics or communication delays. 展开更多
关键词 Antagonistic interaction disagreement behavior dynamic topology signed network static topology
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A Possible Solution to the Disagreement about the Hubble Constant
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作者 Frank R. Tangherlini 《Journal of Modern Physics》 2018年第9期1827-1837,共11页
The current disagreement about the Hubble constant H0 was described as a “Crisis in Cosmology”, at the April (2018) Meeting of the American Physical Society, and hence its resolution is of utmost importance. This wo... The current disagreement about the Hubble constant H0 was described as a “Crisis in Cosmology”, at the April (2018) Meeting of the American Physical Society, and hence its resolution is of utmost importance. This work proposes that the solution to the disagreement between the Planck Collaboration cosmic microwave background (CMB) value of H0, together with the very close BOSS Collaboration baryon acoustic oscillation (BAO) value, and the significantly higher value of H0 found by the SHOES Collaboration cosmic distance ladder (CDL) work, is due to the fact that the CMB and BAO values of H0 are not for an accelerating universe, as generally believed, but are actually the values for a decelerating universe. In contrast, the CDL value of H0 is indeed that for an accelerating universe. It is shown that by replacing the negative deceleration parameter in the expression for logH0 in the CDL work by a positive deceleration parameter, the value of H0 can be brought down to agree with the CMB and BAO lower values. There is a brief review of the author’s decelerating model based on the Einstein de Sitter universe, augmented by a model of dark energy that does not have a negative pressure, but instead has a non-dispersive index of refraction n, causing the speed of light through the dark energy of intergalactic space to be reduced to c/n. As reported earlier, this assumption is sufficient to accommodate the increase in apparent magnitude of the Type Ia supernovae (SNe Ia). Additional support for the model is presented, together with a proposal for astronomical falsification. 展开更多
关键词 HUBBLE CONSTANT disagreement CMB & BAO Determinations Decelerating INTERPRETATION CDL Determination & Modification
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A Possible Solution to the Disagreement about the Hubble Constant II
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作者 Frank R. Tangherlini 《Journal of Modern Physics》 2020年第8期1215-1235,共21页
This work continues the previous study (2018) Journal of Modern Physics. 9, 1827-1837, that proposes that the disagreement arises because the cosmic microwave background (CMB) value for the Hubble constant <em>H... This work continues the previous study (2018) Journal of Modern Physics. 9, 1827-1837, that proposes that the disagreement arises because the cosmic microwave background (CMB) value for the Hubble constant <em>H</em><sub><em>0</em></sub> is actually for a universe which is decelerating rather than accelerating. It is shown that when <em>H</em><sub><em>0</em></sub> of Freedman et al. (2019) Astrophysical Journal, 882: 34 (24 pp.) is re-determined for redshift <em>z </em>= 0.07, by replacing <em>q</em><sub><em>0 </em></sub>= <span style="white-space:nowrap;">&minus;</span>0.53 with <em style="white-space:normal;">q</em><sub style="white-space:normal;"><em>0 </em></sub><span style="white-space:normal;">= <span style="white-space:nowrap;">&minus;</span>0.5</span>, the new lower value is in excellent agreement (0.1%) with the CMB <em>H</em><sub><em>0</em></sub>. The model is modified to include the clustering of galaxies, and the recognition that there are clusters that do not experience the Hubble expansion, such as the Local Group, and hence, in accordance with the model, within the Local Group the speed of light is <em>c</em>. The bearing of this result on the neutrino and light time delay from SN1987a is discussed. It is suggested that the possible emission of a neutrino from the blazar TXS-0506+56, that was flaring at the time, as well as possible neutrino emission earlier, may arise instead from a more distant source that happens to be, angle-wise, near the blazar, and hence the correlation is accidental. The model is further modified to allow for a variable index of refraction, and a comparison with the ΛCDM model is given. The age of the universe for different values of<em> H</em><sub><em>0</em></sub> is studied, and comparison with the ages of the oldest stars in the Milky Way is discussed. Also, gravitational wave determination of <em>H</em><sub><em>0</em></sub> is briefly discussed. 展开更多
关键词 Hubble Constant disagreement Decelerating Universe Galactic Clusters Age of Universe
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A Pragmatic Review on the Making of Disagreements
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作者 肖桂芳 《江西理工大学学报》 CAS 2007年第6期63-65,共3页
Politeness theory is one of most heated topics in pragmatics in recent years.It is possible to treat politeness as a fixed concept,as in the idea of polite social behavior,or etiquette,within a culture. The essay main... Politeness theory is one of most heated topics in pragmatics in recent years.It is possible to treat politeness as a fixed concept,as in the idea of polite social behavior,or etiquette,within a culture. The essay mainly discusses the making of disagreements,using Brown Levinson's Politeness theory as guideline. 展开更多
关键词 语言艺术 争论 国际事务 礼貌原则 语用学
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How EFL Learners from China and ASEAN Countries Politely Express Disagreement in an English Context:A Comparative Study
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作者 Shu Zhang Fang He Di Qu 《教育研究前沿(中英文版)》 2020年第4期275-281,共7页
This paper aims to make a comparative study of cross-cultural communication upon a special speech act-"disagreement".38 undergraduates from China and 30 undergraduates from ASEAN countries were involved.They... This paper aims to make a comparative study of cross-cultural communication upon a special speech act-"disagreement".38 undergraduates from China and 30 undergraduates from ASEAN countries were involved.They responded to the DCT(discourse completion test).Five contexts were selected and detailed descriptions of the scenarios were given.Social distance and gender were selected as the main variants in this study.From the results,we found that both groups of undergraduates generally ten d to use the same politeness strategies according to the same social distance,but gender was a more significant factor in politeness strategies adoption among EFL learners from ASEAN countries.Females tend to use negative strategies more than males do.We can conclude from the results that EFL learners from China and ASEAN countries incline to adopt the same politeness strategies in English context,but females from ASEAN countries are less likely to say“no”directly to express their disagreement compared to their counterpart.Those findings may offer reference to both sides during the pragmatic occasions of communicating. 展开更多
关键词 disagreement Politeness Strategies Social Distance GENDER ASEAN EFL Learners
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An Exploration of the Influences of a Third Party on Chinese College Students’Speech Act of Disagreement
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作者 刘颖 《海外英语》 2021年第12期105-107,共3页
Face is a concept much cared about and delicately disposed among Chinese people,especially with the presence of a third party.Unfortunately so far substantial studies on patterns and politeness strategies utilized to ... Face is a concept much cared about and delicately disposed among Chinese people,especially with the presence of a third party.Unfortunately so far substantial studies on patterns and politeness strategies utilized to diminish the threat to the inter-locutor's face in expressing disagreement have been carried out in English-as-the-first-language settings with lttle effort in ex-ploring disageement in Chinese culture.Therefore,this paper seeks to explore what disagreement strategies Chinese college stu-dents will use to mitigate the face-threatening act with absence or presence of a third party for an attempt to shed some light on the speech act theory in Chinese settings. 展开更多
关键词 disagreement strategies a third party speech act theory Chinese settings
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基于差异阈值循环分组的密钥生成算法
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作者 李贵勇 何斌 方磊 《计算机应用》 CSCD 北大核心 2024年第7期2110-2115,共6页
针对无线通信中通信双方提取的信道特征存在明显差异,导致双方的密钥生成速率和一致率较低的问题,提出差异阈值循环分组的密钥生成算法(TGKG)。首先,对信道状态信息(CSI)进行差异阈值分组,使任意组内元素间的间隔均大于该值,提高组内数... 针对无线通信中通信双方提取的信道特征存在明显差异,导致双方的密钥生成速率和一致率较低的问题,提出差异阈值循环分组的密钥生成算法(TGKG)。首先,对信道状态信息(CSI)进行差异阈值分组,使任意组内元素间的间隔均大于该值,提高组内数据的差异,减小量化误差以降低密钥不一致率;循环分组只需一方进行,防止因数据误差导致的分组不一致。同时,提取信道系数的实部和虚部量化,增加量化比特数目,提高了密钥生成速率。通过概率论及信息论公式证明了所提算法在密钥不一致率、密钥可达速率和安全性3方面的优势。实验结果表明,所提算法在5 dB信噪比(SNR)条件下,通信双方的密钥不一致率约为2%,密钥生成速率约为142%。 展开更多
关键词 物理层安全 密钥生成 差异阈值循环分组 密钥不一致率 密钥生成速率
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供应链数字化与企业ESG分歧——基于供应链创新与应用试点的准自然实验
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作者 杜群阳 陈卓骋 孙镇南 《工业技术经济》 CSSCI 北大核心 2024年第9期121-131,共11页
在数字技术赋能供应链转型升级的背景下,厘清供应链数字化对企业ESG分歧的影响对企业践行ESG理念与推动现代供应链发展具有重要意义。本文基于供应链创新与应用试点工作,以2015~2022年上市公司为研究样本,利用双重差分模型探究供应链数... 在数字技术赋能供应链转型升级的背景下,厘清供应链数字化对企业ESG分歧的影响对企业践行ESG理念与推动现代供应链发展具有重要意义。本文基于供应链创新与应用试点工作,以2015~2022年上市公司为研究样本,利用双重差分模型探究供应链数字化对企业ESG分歧的影响。研究结果显示,供应链数字化降低了企业ESG分歧,环境信息披露的增加与媒体关注度的提高是供应链数字化降低企业ESG分歧的主要渠道。进一步分析发现,供应链数字化带来的企业ESG分歧下降,有助于缓解融资约束、降低经营风险和提升企业价值。本文的研究为ESG分歧的影响因素提供了新的解释视角,对于理解供应链创新与应用试点政策具有一定的启示意义。 展开更多
关键词 供应链数字化 企业ESG分歧 环境信息披露 媒体关注度 融资约束 经营风险 企业价值 双重差分模型
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企业数字化转型与ESG评级分歧 被引量:2
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作者 韩一鸣 胡洁 于宪荣 《财经论丛》 CSSCI 北大核心 2024年第7期59-69,共11页
ESG评级是ESG投资的重要参考,而企业与评级机构间信息不对称所引起的ESG评级分歧成为限制我国资本市场ESG投资的一大难题。本文选取国内外七家ESG评级机构的评级数据,以2015—2021年中国沪深A股上市企业为研究样本,实证检验了企业数字... ESG评级是ESG投资的重要参考,而企业与评级机构间信息不对称所引起的ESG评级分歧成为限制我国资本市场ESG投资的一大难题。本文选取国内外七家ESG评级机构的评级数据,以2015—2021年中国沪深A股上市企业为研究样本,实证检验了企业数字化转型对ESG评级分歧的影响及作用机制,研究结果表明:企业数字化转型通过提升内部信息透明度、增强外部监督关注的渠道抑制了ESG评级分歧;异质性分析表明,民营企业、高新技术企业、非“四大”审计企业和数字基础设施较为完善地区的企业,数字化转型对ESG评级分歧的抑制作用更显著;进一步分析表明,企业数字化转型抑制ESG评级分歧能够弱化其对我国资本市场的负面影响,即提高股票流动性并降低股价同步性,从而有效改善我国资本市场资源配置效率。本文的研究为缓解ESG评级分歧提供了具体思路,对于促进ESG投资并进一步推动我国绿色低碳发展具有现实意义。 展开更多
关键词 ESG评级分歧 ESG投资 数字化转型 资本市场
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Robust Correlation Clustering Problem with Locally Bounded Disagreements
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作者 Sai Ji Min Li +1 位作者 Mei Liang Zhenning Zhang 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2024年第1期66-75,共10页
Min-max disagreements are an important generalization of the correlation clustering problem(CorCP).It can be defined as follows.Given a marked complete graph G=(V,E),each edge in the graph is marked by a positive labe... Min-max disagreements are an important generalization of the correlation clustering problem(CorCP).It can be defined as follows.Given a marked complete graph G=(V,E),each edge in the graph is marked by a positive label"+"or a negative label"_"based on the similarity of the connected vertices.The goal is to find a clustering C of vertices V,so as to minimize the number of disagreements at the vertex with the most disagreements.Here,the disagreements are the positive cut edges and the negative non-cut edges produced by clustering C.This paper considers two robust min-max disagreements:min-max disagreements with outliers and min-max disagreements with penalties.Given parameter δ∈(0,1/14),we first provide a threshold-based iterative clustering algorithm based on LP-rounding technique,which is a(1/δ,7/(1-14δ))-bi-criteria approximation algorithm for both the min-max disagreements with outliers and the min-max disagreements with outliers on one-sided complete bipartite graphs.Next,we verify that the above algorithm can achieve an approximation ratio of 21 for min-max disagreements with penalties when we set parameter δ=1/21. 展开更多
关键词 min-max disagreements OUTLIERS PENALTIES approximation algorithm LP-rounding
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关于社会实践的理论必须“符合”社会实践吗?——对德沃金诠释主义的一个批判
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作者 骆意中 《哲学分析》 CSSCI 北大核心 2024年第4期94-107,198,共15页
诠释主义不认为社会实践能够完全通过社会事实来说明,而认为需要给社会实践附加价值本旨,得出相关判断的最佳证成。但是为了保证对于社会实践的说明仍然是诠释而不是创造了某种并不真实存在的实践,以德沃金为代表的诠释主义要求关于社... 诠释主义不认为社会实践能够完全通过社会事实来说明,而认为需要给社会实践附加价值本旨,得出相关判断的最佳证成。但是为了保证对于社会实践的说明仍然是诠释而不是创造了某种并不真实存在的实践,以德沃金为代表的诠释主义要求关于社会实践的理论需要符合这种社会实践,而这种符合面向需要满足的最重要条件是解释为什么在各种社会实践之中总会存在大量的理论分歧。然而,理论争议依然可以通过社会事实来解释,并且诠释主义在说明理论争议的时候依然预设了诸如效力在内的概念,从而无法真正满足符合面向。 展开更多
关键词 社会实践 诠释主义 理论争议 社会事实
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探析《追寻美德》中道德分歧的解决方案
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作者 刘薇 《西部学刊》 2024年第6期164-168,共5页
如何解决道德分歧问题是《追寻美德》一书所关注的焦点。麦金太尔运用历史主义的方法,从现代社会的道德无序性出发,探寻道德分歧产生的原因,并审视反思了西方道德哲学的发展。他认为道德分歧的基本特征在于不可公度性、预设了非个人的... 如何解决道德分歧问题是《追寻美德》一书所关注的焦点。麦金太尔运用历史主义的方法,从现代社会的道德无序性出发,探寻道德分歧产生的原因,并审视反思了西方道德哲学的发展。他认为道德分歧的基本特征在于不可公度性、预设了非个人的合理论辩模式和具有多种历史起源;原因在于情感主义的泛滥;解决之道在于重新回归亚里士多德的传统伦理学。他的理论虽然切中时弊,但也存在明显的缺陷。探讨其道德分歧解决方案对于反思现代道德的碎片化趋势以及如何搭建道德共识的桥梁、缓解现代道德危机具有一定的参考价值。 展开更多
关键词 情感主义 道德分歧 追寻美德
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德沃金的“语义学之刺”论证对规范性概念研究方法的启示
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作者 牛文浩 《当代中国价值观研究》 2024年第3期22-34,共13页
目前对于德沃金“语义学之刺”论证的讨论基本都忽视了其对于规范性概念研究方法的意义,这在很大程度上源自人们对“语义学之刺”普遍采取的广义理解方式。实际上还存在一种狭义的“语义学之刺”,其通过揭示基于语义学分析方法的“法律... 目前对于德沃金“语义学之刺”论证的讨论基本都忽视了其对于规范性概念研究方法的意义,这在很大程度上源自人们对“语义学之刺”普遍采取的广义理解方式。实际上还存在一种狭义的“语义学之刺”,其通过揭示基于语义学分析方法的“法律”概念不能说明法律实践中的理论争议何以是真实的而非虚幻的,从而对这种方法提出了一种致命的批评。这一批评的基本思路被德沃金普遍地运用于其他具有“价值负载”的规范性概念。德沃金认为阐释性方法可以解决“语义学之刺”问题,因而是一种更为适当的规范性概念研究方法。由于以语义学分析方法来研究规范性概念的做法具有普遍性,德沃金的主张将会使得规范性概念研究的面貌发生极大的改变,并对道德、政治及法律实践产生重要影响。 展开更多
关键词 语义学之刺 规范性概念 争议 语义学分析 阐释
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投资者情绪分歧、异质解读与资产定价——基于高阶预期视角的研究 被引量:1
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作者 吴慧慧 迟骏 《金融理论探索》 2023年第3期55-68,共14页
投资者情绪分歧是影响资产定价的系统性因素,然而其发挥作用背后的经济原理尚缺乏剖析。基于高阶预期理论框架构建投资者情绪分歧资产定价模型,从股价和交易量两个角度分析投资者情绪分歧对资产定价的影响,并通过引入异质解读,深入探讨... 投资者情绪分歧是影响资产定价的系统性因素,然而其发挥作用背后的经济原理尚缺乏剖析。基于高阶预期理论框架构建投资者情绪分歧资产定价模型,从股价和交易量两个角度分析投资者情绪分歧对资产定价的影响,并通过引入异质解读,深入探讨高阶预期和异质解读双重因素驱动下投资者情绪分歧变动引起公共信息市场反应的内在机理。结果表明,投资者情绪分歧对股票价格和交易量的影响分别取决于平均投资者情绪和高阶预期的阶数。进一步研究发现,异质解读负向影响公共信息股价效应,其对公共信息交易量效应的影响依赖于先验投资者情绪分歧水平。基于研究结论,提出完善上市公司信息披露制度和优化投资者结构的政策建议。 展开更多
关键词 投资者情绪分歧 异质解读 高阶预期 资产定价
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夫妻生育分歧对家庭生育行为的影响研究——解释生育意愿和生育行为偏离的新视角 被引量:5
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作者 乐菡 杨昕 《人口学刊》 CSSCI 北大核心 2023年第4期30-40,共11页
家庭是冲突与合作并存的地方,家庭成员之间往往具有不同的偏好和效用,最终在决策上产生分歧。生育行为不是个体的独立行为,夫妻双方对于生育同样具有独立决策权,当夫妻任何一方否决生育决策时,夫妻双方生育决策的合作被打破,最终导致生... 家庭是冲突与合作并存的地方,家庭成员之间往往具有不同的偏好和效用,最终在决策上产生分歧。生育行为不是个体的独立行为,夫妻双方对于生育同样具有独立决策权,当夫妻任何一方否决生育决策时,夫妻双方生育决策的合作被打破,最终导致生育行为暂时延迟或一方妥协。随着生育政策的放开,夫妻间关于生育决策的分歧逐渐由生育时机分歧向生育数量分歧转变。本文利用2014年和2018年中国家庭追踪调查(CFPS)数据,在新家庭经济学讨价还价的生育决策理论框架下,分析夫妻关于生育数量存在的生育分歧及其对生育行为的影响机理,为低生育率陷阱提供了新的对策,同时为生育意愿和生育行为偏离的现象提供新的理论依据。研究发现:夫妻生育分歧普遍存在,相比之下,生育过1个孩子的家庭分歧程度更大。实证结果显示生育分歧对家庭生育行为具有显著负向作用,生育分歧越大,发生生育行为的概率越低。分样本回归结果显示丈夫和妻子同样具有生育否决权,但在决定是否生育一孩和二孩时,男性否决对生育行为的影响更大;随着家庭中子女数量的增加,妻子否决对于生育行为的负向效应逐渐显现并增强。调节效应结果显示女性承担较重的育儿负担会强化生育分歧对生育行为的抑制作用。 展开更多
关键词 夫妻生育分歧 生育行为 生育否决
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解决认知分歧:专家证言的作用与限度
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作者 喻郭飞 《哲学评论》 2023年第1期18-32,共15页
在当代知识论中,证言(testimony)被人们视作知识的重要来源之一,大家依靠他人特别是不同领域内专家提供的证言为自己相信某个命题进行认知辩护,以获得新的知识。在此过程中,人们面临着如何合理地对待专家证言、避免过分依赖或盲目迷信... 在当代知识论中,证言(testimony)被人们视作知识的重要来源之一,大家依靠他人特别是不同领域内专家提供的证言为自己相信某个命题进行认知辩护,以获得新的知识。在此过程中,人们面临着如何合理地对待专家证言、避免过分依赖或盲目迷信的困境,尤其是人们如何运用专家证言解决认知分歧成为当前知识论的热点议题。本文通过考察专家证言的特征及其在认知辩护中的作用与限度,从认知自主性、认知责任和认知依赖之间的关系入手,阐明专家证言对于解决认知分歧的意义。 展开更多
关键词 专家证言 认知分歧 自主性 认知责任 认知依赖
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科谊、切劘与复雅诗盟:“后七子”结社的由隐及显
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作者 魏柔嘉 《励耘学刊》 2023年第1期175-198,386,共25页
“后七子”结社的始末,经徐朔方、廖可斌、郑利华、周颖等学人的考索,已较为明晰,但诸子在结社前已具有的人际关系、与谢榛的重要分歧以及作为正式结社标志的《五子诗》与“前七子”的关联等问题仍需考证。通过对诸子文集的阅读,结合《... “后七子”结社的始末,经徐朔方、廖可斌、郑利华、周颖等学人的考索,已较为明晰,但诸子在结社前已具有的人际关系、与谢榛的重要分歧以及作为正式结社标志的《五子诗》与“前七子”的关联等问题仍需考证。通过对诸子文集的阅读,结合《登科录》《明实录》等史籍文献,考证宗臣的父亲和王世贞的父亲是乡试同年,梁有誉、徐中行在任职刑部前就与进士同年宗臣往来唱和,吴国伦与王世贞为门生与座主之子的关系;谢榛赞同袭用古人诗句并进行改写,而王世贞、李攀龙则认为这属于剽窃模拟,这是谢榛与王、李诸子的重要分歧;《五子诗》的创作继承自何景明的《六子诗》,后者与诸子的《五子诗》在内容上存在互文关系。 展开更多
关键词 “后七子” 诗学分歧 《五子诗》 复雅传统
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基于输出不一致测度的极限学习机集成的基因表达数据分类 被引量:41
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作者 陆慧娟 安春霖 +2 位作者 马小平 郑恩辉 杨小兵 《计算机学报》 EI CSCD 北大核心 2013年第2期341-348,共8页
选择性集成学习已经成为分析基因表达数据、获取生物学信息的有力工具.为了更好地挖掘基因表达数据,利用极限学习机的集成,克服单个ELM用于数据分类时性能欠稳定的缺点,文中提出了一种基于输出不一致测度的ELM相异性集成算法(D-D-ELM).... 选择性集成学习已经成为分析基因表达数据、获取生物学信息的有力工具.为了更好地挖掘基因表达数据,利用极限学习机的集成,克服单个ELM用于数据分类时性能欠稳定的缺点,文中提出了一种基于输出不一致测度的ELM相异性集成算法(D-D-ELM).算法首先以输出不一致测度为标准对多个ELM模型进行相异性判断,其次根据ELM的平均分类精度剔除掉相应的模型,最后对筛选后的分类模型用多数投票法进行集成.算法被运用到Breast、Leukemia、Colon、Heart基因表达数据上,并通过理论和实验得到验证.实验结果的统计学分析表明D-D-ELM能够以更少的模型数量达到较稳定的分类精度. 展开更多
关键词 极限学习机 基因表达数据 集成算法 输出不一致测度 分类
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投资者情绪、意见分歧与中国股市IPO之谜 被引量:73
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作者 俞红海 李心丹 耿子扬 《管理科学学报》 CSSCI 北大核心 2015年第3期78-89,共12页
中国股票市场IPO首日回报高、长期回报低的现象十分突出,传统理性金融理论难以对这两者同时加以解释.文章基于行为金融理论,从二级市场个体投资者情绪与意见分歧相结合的角度,利用账户交易数据中的投资者IPO首日净买入构建情绪指标对上... 中国股票市场IPO首日回报高、长期回报低的现象十分突出,传统理性金融理论难以对这两者同时加以解释.文章基于行为金融理论,从二级市场个体投资者情绪与意见分歧相结合的角度,利用账户交易数据中的投资者IPO首日净买入构建情绪指标对上述现象进行研究,结果表明IPO首日投资者情绪和意见分歧均对IPO首日回报有显著为正的解释力,尤其是当意见分歧严重时,投资者情绪的影响更大,同时首日投资者情绪对IPO长期超额回报有显著为负的影响,但意见分歧却对长期回报没有影响.文章的研究从二级市场个体投资者非理性偏好角度揭示了中国股市"IPO之谜"产生的根源. 展开更多
关键词 IPO之谜 投资者情绪 意见分歧 投资者交易
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