Current Location:home > Browse

Subjects

Institution

Your conditions: Multi version Papers(191)

1. 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 s- pace equipped with the endograph metric and the sendograph metric, re- spectively. We fist discuss the level characterizations of the Γ-convergence and the endograph metric, and point out the elementary relationships among Γ-convergence, endograph metric and the sendograph metric. On the basis of these results, we present the characterizations of total boundedness, rel- ative compactness and compactness in the space of compact positive α-cuts fuzzy sets equipped with the endograph metric, and in the space of com- pact support fuzzy sets equipped with the sendograph metric, respectively. Furthermore, we give completions of these two kinds of spaces, respectively.

submitted time 2021-11-27 Hits6838Downloads442 Comment 0

2. chinaXiv:202105.00003 [pdf]

SEPRES: Sepsis prediction via a clinical data integration system and real-world studies in the intensive care unit

Chen, Qiyu; Li, Ranran; Lin, Chihche; Lai, Chiming; Chen, Dechang; Qu, Hongping; Huang, Yaling; Lu, Wenlian; Tang, Yaoqing; Li, Lei
Subjects: Medicine, Pharmacy >> Clinical Medicine

Background: Sepsis is vital in critical care medicine, and early detection and intervention are key to survival. We aimed to establish an early warning system for sepsis based on a data integration system that can be implemented in the intensive care unit (ICU). Methods: We trained the LightGBM and multilayer perceptron on the open-source database Medical Information Mart for Intensive Care for sepsis prediction. An ensemble sepsis prediction model was established based on the transfer learning and ensemble learning technique on the private dataset of Ruijin Hospital. The Shapley Additive Explanations analysis was applied to present feature importance on the prediction inference. With the development of data-integrating hub to collect and transmit data from different brands of ICU medical devices, the data integration system was established to receive, integrate, standardize, and store the real-time clinical data. In this way, the sepsis prediction model developed in the ICU of the Ruijin Hospital for the real-world study of sepsis early warning on ICU management. The trial was registered with ClinicalTrials.gov (NCT05088850). Findings: Our best early warning model achieved an area under the receiver operating characteristic curve (AUC) of 0·9833 in the task of detecting sepsis in 4-h preceding on the open-source database, while our ensemble model achieved an AUC of 0·9065?0·9436 in the retrospective research from 1?5-h preceding on the private database, and 0·8636?0·8992 in real-time real-world studies using the data integration system in the ICU of the Ruijin Hospital. In the continuous early warning process of patients admitted to the ICU, 22 patients who met the diagnostic criteria for sepsis during hospitalization were predicted as positive cases; 29 patients without sepsis were predicted as negative cases. Additionally, 17 patients were predicted as false-positive cases; in six patients with sepsis during ICU stay, the predicted probabilities at different time nodes were all less than the warning threshold 0·7 and predicted as false-negative cases. Interpretation: Machine learning models could allow accurate and real-time inference to detect sepsis onset within 5-h preceding at most with the help of the data integration system. We identified the features such as age, antibiotics, ventilation, and net balance to be important for the sepsis prediction inference. We argue that this system has promising potential to improve ICU management by helping medical practitioners identify at-sepsis-risk patients and prepare for timely diagnosis and intervention. Funding: Shanghai Municipal Science and Technology Major Project, the ZHANGJIANG LAB, and the Science and Technology Commission of Shanghai Municipality.

submitted time 2021-11-22 Hits1622Downloads674 Comment 0

3. chinaXiv:202111.00019 [pdf]

公仆型领导的负面效应及其缓冲机制探究

凌茜; 张正杰; 丘小燕
Subjects: Psychology >> Management Psychology

过去,研究人员普遍认为公仆型领导是一种对员工、团队和组织有积极作用的领导方式,但新近的研究表明公仆型领导也会引起潜在的负面效应。针对此问题,首先介绍公仆型领导的概念与研究概况。然后,分别从领导者自身和下属员工的角度,基于角色压力、自我控制资源分配、资源保存、内隐追随、领导与成员交换、领导原型等理论,探究公仆型领导的负面效应及其缓冲机制。最后,从研究层面、研究方法、研究视角、研究内容等四个方面提出未来研究建议。

submitted time 2021-11-20 Hits248Downloads104 Comment 0

4. chinaXiv:202104.00084 [pdf]

共情关怀对公平决策的影响——来自ERP的证据

何怡娟; 胡馨木; 买晓琴
Subjects: Psychology >> Social Psychology
Subjects: Psychology >> Cognitive Psychology

本研究运用事件相关电位技术(event-related potential, ERP)和最后通牒博弈范式(ultimatum game, UG)考察了共情关怀对公平决策的影响。实验采用2(状态共情关怀: 有共情关怀vs.无共情关怀)×3(分配公平性: 公平vs.劣势不公平vs.优势不公平)被试内设计, 共37名被试参与实验, 被试作为响应者选择是否接受提议者的分配提议。行为结果显示劣势不公平条件下, 有共情情境的接受率高于无共情情境; 优势不公平条件下呈现相反的结果。ERP结果显示: 对于他人提出的优势不公平提议, 无共情情境较有共情情境下诱发了更负的前部N1(anterior N1, AN1), 有共情情境比无共情情境下诱发了更大的P2波幅; 有共情情境下, 他人提出的劣势不公平提议较优势不公平和公平提议诱发了更负的内侧额叶负波(medial frontal negativity, MFN); P3在公平条件下的波幅较劣势不公平条件下更大, 并未受到共情关怀的调节。这些结果表明共情关怀不仅调节了公平决策行为, 还调节了公平加工的早期注意和动机及之后的认知和情绪加工, 但由P3表征的高级认知过程仅受到公平性的调节而不受共情水平的影响。

submitted time 2021-11-19 Hits2320Downloads685 Comment 0

5. 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熵在水文学、环境气象学、生态学、化学信息学、认知神经学、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、政治学,以及能源工程、制造工程、可靠性工程、航空工程、通信工程、测绘工程和金融工程等领域的实际应用。

submitted time 2021-11-10 Hits13435Downloads1534 Comment 0

6. chinaXiv:202110.00059 [pdf]

儿童和青少年同伴侵害与攻击行为关系的三水平元分析

陈静; 冉光明; 张琪; 牛湘
Subjects: Psychology >> Developmental Psychology

攻击行为在儿童和青少年的社会、情感和心理适应中发挥着重要作用, 而同伴侵害是儿童和青少年攻击行为一个重要的预测因素。先前的一些研究已经考察了儿童和青少年同伴侵害与攻击行为之间的关系, 但是尚不完全清楚调节效应对二者关系的影响。因此当前研究采用三水平元分析方法检验效应量的可靠性和一系列调节效应。在系统地搜索了2020年10月之前发表的文献后, 当前元分析确定了40项研究, 包括25605名被试, 共计333个独立效应量。主效应检验发现儿童和青少年的同伴侵害与攻击行为呈显著正相关。此外, 调节效应检验发现同伴侵害变量具有显著的调节作用。与身体侵害相比, 关系侵害与儿童和青少年攻击行为之间的相关更强。儿童和青少年的同伴侵害与攻击行为也受到了地区的调节, 它们之间的关系在亚洲地区比在南美洲地区更强。研究设计也是一个显著的调节变量, 儿童和青少年同伴侵害与攻击行为的相关在纵向研究中比在横向研究中更低。最后, 当前元分析的结果显示同伴侵害的报告者也是一个显著的调节变量。与同伴报告的同伴侵害相比, 教师报告的同伴侵害与儿童和青少年攻击行为之间的相关较高。当前研究的结果指出, 在预防、控制儿童和青少年的攻击行为时应该注意同伴侵害对其的影响。

submitted time 2021-11-06 Hits5013Downloads172 Comment 0

7. chinaXiv:202110.00072 [pdf]

“有声有色”的触觉体验:来自多感觉通道整合的线索

万必成; 马舒; 杨振; 李宏汀
Subjects: Psychology >> Industrial Psychology

虚拟现实技术通过提供视觉、听觉和触觉等信息为用户创造身临其境的感知体验,其中触觉反馈面临诸多技术瓶颈使得虚拟现实中的自然交互受限。基于多感官错觉的伪触觉技术可以借助其他通道的信息强化和丰富触觉感受,是目前虚拟现实环境中优化触觉体验的有效途径。本文聚焦于触觉中最重要的维度之一——粗糙度,试图为解决虚拟现实中触觉反馈的受限问题提供新思路。探讨了粗糙度感知中,视、听、触多感觉通道整合的关系,分析了视觉线索(表面纹理密度、表面光影、控制显示比)和听觉线索(音调/频率、响度)如何影响触觉粗糙度感知,总结了当下调控这些因素来改变粗糙度感知的方法。最后,探讨了使用伪触觉反馈技术时,虚拟现实环境中视、听、触觉信息在呈现效果、感知整合等方面与真实世界相比可能存在的差异,提出可借鉴的改善触觉体验的适用方法和未来待研究的方向。

submitted time 2021-10-28 Hits530Downloads221 Comment 0

8. chinaXiv:202101.00003 [pdf]

On dark matter

Xian-Qiao Yu
Subjects: Physics >> The Physics of Elementary Particles and Fields

In this article, I shall propose an enlightening view on the origin of dark matter abundance, in which I introduce a neutral primordial field, which is a new field beyond the standard model. All the standard model elementary particles are produced spontaneously from this field in the Big Bang epoch of the universe and then these produced elementary particles decayed or annihilated in the well-known standard model interactions. The relic of the primordial field appears in a form of vacuum energy can not only give naturally the correct abun- dance of dark matter in the present universe, but provide a natural solution to the cosmological constant problem as well. We find that the conventional methods of detecting dark matter either fail or have great difficulties to detect the remaining vacuum energy of the primordial field, and how to confirm the existence of the remaining energy of the universe’s original energy in experiment is still an open problem.

submitted time 2021-10-08 Hits13899Downloads1086 Comment 0

9. chinaXiv:202011.00114 [pdf]

精神分析的主体间转向:理论特征与分歧

张巍; 郭本禹; 张磊
Subjects: Psychology >> History of Psychology

主体间理论是当代精神分析领域最重要的取向之一。与更传统的精神分析相比,其理论特征表现为从区分“内/外”空间到强调“之间”的空间、从“主体—客体”关系到“主体—主体”关系、从顿悟到行动、从基础主义和实证主义到诠释学和建构主义。尽管存在术语的混乱和观点的分歧,但精神分析的主体间转向几乎遍及各个流派,广泛影响了北美洲、欧洲和拉丁美洲的诸多分析师。未来的主体间理论需要保持开放的态度,持续与先前的理论、临床资料和其他学科领域对话。

submitted time 2021-10-07 Hits5867Downloads1155 Comment 0

10. chinaXiv:202107.00009 [pdf]

基于过程数据的问题解决能力测量及数据分析方法

刘耀辉; 徐慧颖; 陈琦鹏; 詹沛达
Subjects: Psychology >> Psychological Measurement

问题解决能力是指在没有明显解决方法的情况下个体从事认知加工以理解和解决问题情境的能力。对问题解决能力的测量需要借助相对更复杂、更真实、具有可交互性的问题情境来诱导问题解决行为的呈现。使用虚拟测评抓取问题解决的过程数据并分析其中所蕴含的潜在信息是当前心理计量学中测量问题解决能力的新趋势。首先,回顾问题解决能力测量方式的发展:从纸笔测验到虚拟测评。然后,总结对比两类过程数据的分析方法:统计建模法和数据挖掘法。最后,从非认知因素的影响、多模态数据的利用、问题解决能力发展的测量、其他高阶思维能力的测量和问题解决能力概念及结构的界定五个方面展望未来可能的研究方向。

submitted time 2021-10-04 Hits4207Downloads461 Comment 0

12345678910  Last  Go  [20 Pages/ 191 Totals]