Current Location:home > Browse

Subjects

Institution

Your conditions: Multi version Papers(224)

1. chinaXiv:202205.00035 [pdf]

基于深度学习文本情绪挖掘股市相关性研究

张宸瑞
Subjects: Computer Science >> Natural Language Understanding and Machine Translation

探讨如何对股吧等金融论坛数据进行爬取并结合深度学习模型进行情感分析。本文将使用BERT模型针对金融语料进行训练,并对深证成指进行对比分析。通过最大互信息系数对比验证,发现将BERT模型应用到金融语料中所得到的情感特征能够证明情绪变量在一定程度上与股票价格存在一定相关性。同时本文是深度学习在金融环境下的运用。在通过深度学习的方法进一步探究投资者情绪对股票市场的影响机制,将有利于国家监管部门和政策部门对维持股票市场稳定性制定更加合理的政策方针。

submitted time 2022-05-13 Hits1336Downloads40 Comment 0

2. chinaXiv:202105.00070 [pdf]

Copula熵:理论和应用

马健
Subjects: Statistics >> Mathematical Statistics
Subjects: Computer Science >> Computer Application Technology
Subjects: Information Science and Systems Science >> Basic Disciplines of Information Science and Systems Science

统计独立性是统计学和机器学习领域的基础性概念,如何表示和度量统计独立性是该领域的基本问题。 Copula 理论提供了统计相关性表示的理论工具,而 Copula 熵理论则给出了度量统计独立性的概念工具。本文综述了 Copula熵的理论和应用,概述了其基本概念定义、定理和性质,以及估计方法。介绍了 Copula 熵研究的最新进展,包括其在统计学四个基本问题(结构学习、关联发现、变量选择和时序因果发现等)上的理论应用。讨论了四个理论应用之间的关系,以及其对应的深层次的相关性和因果性概念之间的联系,并将 Copula 熵的(条件)独立性度量框架与基于核函数和距离的相关性度量框架进行了对比。简述了 Copula 熵在理论物理学、化学信息学、水文学、环境气象学、生态学、农学、认知神经学、运动神经学、计算神经学、系统生物学、生物信息学、临床诊断学、老年医学、公共卫生学、经济政策学、社会学、政治学,以及能源工程、土木工程、制造工程、可靠性工程、航空航天、通信工程、测绘工程和金融工程等领域的实际应用。

submitted time 2022-05-12 Hits34275Downloads3634 Comment 0

3. chinaXiv:202205.00030 [pdf]

基于称名反应模型的CD-CAT选题策略比较研究

张杰; 罗照盛; 喻晓锋; 秦春影
Subjects: Psychology >> Psychological Measurement

当前大多数CD-CAT有关的研究都是基于0-1计分的数据资料展开的,而在实际的教育与心理测验中,还包含大量称名反应数据。本文基于称名反应认知诊断模型(NR-cRUM)开发了适用于称名反应数据的CD-CAT(以下简称NCD-CAT),并将7种0-1计分CD-CAT的选题方法引入NCD-CAT中。比较不同条件下,不同选题方法对被试判准率和测验效率的影响。结果表明NR_PWCDI、NR_MPWKL等PWKL系新方法和NR_SHE/MI方法能较好地适用于NCD-CAT,且在大多数条件下优于基线方法NR_PWKL。研究拓展了称名多级计分CD-CAT的选题方法。

submitted time 2022-05-12 Hits4318Downloads57 Comment 0

4. chinaXiv:202204.00026 [pdf]

认知诊断评价中的被试拟合研究

喻晓锋; 唐茜; 秦春影; 李喻骏
Subjects: Psychology >> Psychological Measurement
Subjects: Psychology >> Educational Psychology

通常情况下,认知诊断需要通过认知诊断模型对被试进行诊断评价。认知诊断模型所生成的诊断结果的有效性依赖于被试作答反应是否与所选用的模型拟合。因此,在对诊断结果进行评估的时候,需要通过被试拟合分析来对被试个体的作答反应与模型的拟合情况进行检验,以避免错误或无效的补救措施。本研究基于加权的得分残差,提出认知诊断评价中新的被试拟合指标R 。模拟研究结果表明,R 指标的一类错误率有较好的稳定性,对随机作答、疲劳、睡眠和创造性作答四种异常被试类型均有较高的统计检验力。并将R 指标应用于分数减法实证数据,展示R 指标在实际测验中的使用过程。

submitted time 2022-05-12 Hits5184Downloads231 Comment 0

5. chinaXiv:202107.00011 [pdf]

Properties of several fuzzy set spaces

Huan Huang
Subjects: Mathematics >> Mathematics (General)

This paper discusses the properties the spaces of fuzzy sets in a metric space equipped with the endograph metric and the sendograph metric, respectively. We fist give some relations among the endograph metric, the sendograph metric and the Γ-convergence, and then investigate the level characterizations of the endograph metric and the Γ-convergence. By using the above results, we give some relations among the endograph metric, the sendograph metric, the supremum metric and the dp* metric. On the basis of the above results, we present the characterizations of total boundedness, relative compactness and compactness in the space of compact positive α-cuts fuzzy sets equipped with the endograph metric, and in the space of compact support fuzzy sets equipped with the sendograph metric, respectively. Furthermore, we give completions of these metric spaces, respectively.

submitted time 2022-05-09 Hits17044Downloads947 Comment 0

6. chinaXiv:202110.00083 [pdf]

Properties of fuzzy set spaces with Lp metrics

黄欢
Subjects: Mathematics >> Mathematics (General)

In this paper, we discuss the properties of  the spaces of fuzzy sets in a metric space with $L_p$-type $d_p$ metrics, $p\geq 1$. Firstly, we give the characterizations of compactness in fuzzy set space with $d_p$ metrics. Then we present the completions of fuzzy set spaces with $d_p$ metrics.
The $d_p$ metrics are well-defined if and only if a function induced by the Hausdorff metric is measurable. In this paper, we give some fundamental conclusions on the measurability of this function. This paper was submitted to Fuzzy Sets and Systems on 2022.05.06.

submitted time 2022-05-07 Hits7754Downloads518 Comment 0

7. chinaXiv:202108.00116 [pdf]

Some discussions on Hausdorff metric

黄欢
Subjects: Mathematics >> Mathematics (General)

In this paper, we discuss the properties of functions generated using Hausdorff metric.

submitted time 2022-04-30 Hits10511Downloads813 Comment 0

8. chinaXiv:202201.00057 [pdf]

Ladderpath Approach: How Tinkering and Reuse Enhance Complexity and Information

Liu, Yu; Di, Zengru; Gerlee, Philip
Subjects: Information Science and Systems Science >> Basic Disciplines of Information Science and Systems Science

The notion of information and complexity are important concepts in many scientific fields such as molecular biology, evolutionary theory, and exobiology. Most measures of these quantities, such as Shannon entropy and related complexity measures, are only defined for objects drawn from a statistical ensemble and cannot be computed for single objects. Based on assembly theory, we attempt to fill this gap by introducing the notion of a ladderpath which describes how an object can be decomposed into a hierarchical structure using repetitive elements. From the ladderpath two measures naturally emerge: the ladderpath-index and the order-index, which represent two axes of complexity. We show how the ladderpath approach can be applied to both strings and spatial patterns and argue that all systems that undergo evolution can be described as ladderpaths. Further, we discuss possible applications to human language and the origins of life. The ladderpath approach provides a novel characterization of the information that is contained in a single object (or a system) and could aid in our understanding of evolving systems and the origin of life in particular.

submitted time 2022-04-26 Hits5318Downloads511 Comment 0

9. chinaXiv:202202.00049 [pdf]

中国科学情报大学的创建与沿革

孟广均; 初景利
Subjects: Library Science,Information Science >> Information Science

[目的/意义]追溯中国科学院1958年成立的中国科学情报大学的历史,为中国情报学教育的缘起提供更多的佐证。[方法/过程]通过调取中国科学院多个机构的档案、对当事人进行访谈、文字和图片,论证中国科学情报大学的历史沿革,记叙中国情报学教育这段珍贵的历史。[结果/结论]中国最早开办正规情报学教育的中国科学情报大学是中国科学院创建的,中国科学院大学经济与管理学院图书情报与档案管理系的历史也应追溯到1958年的中国科学情报大学。自1958年至今,继中国科学情报大学之后,中国科学技术大学和中国科学院大学也相继传承了情报学教育(“图书情报与档案管理”学科)。

submitted time 2022-04-25 Hits7545Downloads830 Comment 2

10. chinaXiv:202204.00128 [pdf]

Dynamic Prediction of Abnormal Condition for Multiple Fused Magnesium Melting Processes Based on Video Continual Learning

Zhang, Zhe
Subjects: Information Science and Systems Science >> Control science and technology

Process industry is the pillar industry of national economy, particularly, the process of producing magnesia by fused magnesia furnace system is a typical category of process industry. Due to the complex smelting mechanism and changing production factors, abnormal working conditions often occur in fused magnesia furnace. The semi-molten condition is the most typical and harmful abnormal condition. In this paper, an adaptive pretraining-inference-dynamic training-validation semantic segmentation method based on industrial video is proposed for dynamic prediction of semi-molten condition of multiple fused magnesium furnaces. The experimental results show that compared with the prediction model without adaptive learning, the prediction performance of the adaptive learning model in this paper for multiple fused magnesium melting processes is significantly improved.

submitted time 2022-04-20 Hits756Downloads155 Comment 0

12345678910  Last  Go  [23 Pages/ 224 Totals]