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ECOC多类分类中基分类器non-competence问题研究 被引量:1
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作者 雷蕾 王晓丹 +1 位作者 权文 罗玺 《系统工程与电子技术》 EI CSCD 北大核心 2017年第12期2637-2645,共9页
在纠错输出编码(error-correcting output code,ECOC)多类分类中,当待识别样本的真实类别不属于对应二类子类划分时,训练得到的基分类器将不具备对此类样本进行分类的能力,此时的基分类器在解码融合时面临着non-competence问题。如何衡... 在纠错输出编码(error-correcting output code,ECOC)多类分类中,当待识别样本的真实类别不属于对应二类子类划分时,训练得到的基分类器将不具备对此类样本进行分类的能力,此时的基分类器在解码融合时面临着non-competence问题。如何衡量基分类器是否具备对样本的分类能力,以及如果不具备,如何减少此种情况下对分类效果的影响是基于ECOC多类分类面临的新问题。针对解码框架中non-competent基分类器的分类融合问题,提出一种基于基分类器对样本是否具有分类能力的加权解码方法。该方法利用支持向量数据描述衡量待识别样本与各划分子类之间的距离,同时利用加权解码,通过对基分类器权重的学习,进而增强对类别拥有分类能力的基分类器的影响,减少不具备分类能力的基分类器产生的误差。基于UCI数据集的实验表明所提方法的有效性和实用性。 展开更多
关键词 多类分类 纠错输出编码 分类能力 支持向量数据描述
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Two Models for the Cultivation of Postgraduates' Communicative Competence in the Classroom
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作者 曹浩煊 石兰 《陕西师范大学学报(哲学社会科学版)》 CSSCI 北大核心 1999年第S1期101-104,共4页
CLCnumber:H319Documentcode:AArticleID:1000┐5293(1999)Sup.┐0102┐041.TwoKindsofCommunicativeApproachesAfterpro... CLCnumber:H319Documentcode:AArticleID:1000┐5293(1999)Sup.┐0102┐041.TwoKindsofCommunicativeApproachesAfterprobingtheviewsoncom... 展开更多
关键词 COMMUNICATIVE competence LANGUAGE Acquisition LANGUAGE Learning POSTGRADUATE English Teaching
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Developing Intercultural Competence in a Third Space
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作者 Zhang Junmin 《学术界》 CSSCI 北大核心 2017年第6期288-294,共7页
From the perspective of the Third Space Theory(TST),this study explores eighteen international students’experiences and perceptions of their intercultural interactions on a university campus in Shanghai,the People’s... From the perspective of the Third Space Theory(TST),this study explores eighteen international students’experiences and perceptions of their intercultural interactions on a university campus in Shanghai,the People’s Repulic of China(PRC).The study employs an open-ended questionnaire and two focus group interviews to collect qualitative data.The research findings reveal that participants make creative use of their third space to different degrees and in certain forms.Furthermore,the research findings identify several factors influencing their intercultural growth,including the lack of meaningful learning in intercultural interaction and students’discrepant motives.The conclusion supports the claim that to better improve international students’intercultural competence,it is of great importance for both students and faculty members to co-develop intercultural awareness and skills. 展开更多
关键词 INTERCULTURAL competence the THIRD Space Theory CULTURAL DIVERSITY
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Competence Set Analysis Under Risk and Uncertainty
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作者 Feng Junwen School of Economics and Management, Nanjing University of Scienece and Technology, 210094, P. R. China 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2001年第2期12-18,共7页
The competence set analysis technology can be applied to solve the decision making problems successfully and satisfactorily. This paper mainly focuses on the expanding strategy research and development of the competen... The competence set analysis technology can be applied to solve the decision making problems successfully and satisfactorily. This paper mainly focuses on the expanding strategy research and development of the competence set under risk and uncertainty. A systematic expression of the competence set analysis is described, several expanding principles and strategies with regard to several different cases are presented, and their applications in the personnel training program are discussed, some conclusions and suggestions to be developed in a further work are included. 展开更多
关键词 competence set analysis competence expansion Decision analysis Habitual domain Risk and uncertainty analysis Expansion principle and strategy.
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Competences for a culture of prevention 被引量:1
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作者 BOLLMANN Ulrike 《西安科技大学学报》 CAS 北大核心 2016年第5期741-749,共9页
Work is changing. Traditional approaches to prevention fall short. A broader understanding of prevention and the cultural transformation associated with it mean that there are new demands on companies and their employ... Work is changing. Traditional approaches to prevention fall short. A broader understanding of prevention and the cultural transformation associated with it mean that there are new demands on companies and their employees. People and organisations need competences for this transformation; they must be empowered to create humane living and working conditions. In order for people and organisations to be able to develop competences for the transformation,appropriate structural conditions in educational institutions and workplaces must be created. These conditions should enable people to experience a feeling of competence,to feel part of something and to perceive their actions as autonomous. 展开更多
关键词 教育机构 文化转型 工作条件 文化事业
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Exploringthe Cultivation of Intercultural Competence in Foreign Language Education
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作者 Zhang Junmin 《学术界》 CSSCI 北大核心 2016年第8期299-303,共5页
The pace of globalization leads to an unremitting attention on the cultivation of intercultural competence as well as intercultural citizenship education.This article argues that cultural intelligence functions as an ... The pace of globalization leads to an unremitting attention on the cultivation of intercultural competence as well as intercultural citizenship education.This article argues that cultural intelligence functions as an effective pathway to assess and develop one's ability of adaptation in a culturally diverse context.The further analysis provides an evidence for the feasibility of integrating cultural intelligence development with foreign language education programs. 展开更多
关键词 交际能力 外语教学 跨文化 培养 公民教育 有限元分析 文化背景 智力发展
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Cultivation of Intercultural Communicative Competence --Comparative Study of Chinese - western Cultures
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作者 Jiang Youwei 《学术界》 CSSCI 北大核心 2015年第8期312-318,共7页
Foreign language learning starts with the cultivation of learners' linguistic competence and can only be called successful if learners are inter- culturally competent. This article first takes a closer look at the... Foreign language learning starts with the cultivation of learners' linguistic competence and can only be called successful if learners are inter- culturally competent. This article first takes a closer look at the origin and significance of intercultural communication,then compares the differences between Chinese and western culture in marriage,heroism and educational concepts,and finally suggests attaching importance to the integration of language learning and cultural transmission,cultivation of both cultural sensitivity and cultural empathy in order to help language learners acquire communicative competence. 展开更多
关键词 跨文化交际 交际能力 文化比较 培养 中西方 外语学习 语言学习 语言能力
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Inference for dependence competing risks from bivariate exponential model under generalized progressive hybrid censoring with partially observed failure causes 被引量:2
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作者 WANG Liang LI Huanyu MA Jin'ge 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2019年第1期201-208,共8页
Inference are considered for the dependence competing risks model by using the Marshal-Olkin bivariate exponential distribution. Under generalized progressively hybrid censoring with partially observed failure causes,... Inference are considered for the dependence competing risks model by using the Marshal-Olkin bivariate exponential distribution. Under generalized progressively hybrid censoring with partially observed failure causes, the maximum likelihood estimators are established, and the approximate confidence intervals are also constructed via the observed Fisher information matrix.Moreover, Bayes estimates and highest probability density credible intervals are presented and the importance sampling technique is used to compute corresponding results. Finally, the numerical analysis is proposed for illustration. 展开更多
关键词 DEPENDENCE competing risk generalized PROGRESSIVE HYBRID CENSORING BIVARIATE exponential distribution Bayesian inference.
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Health evaluation method for degrading systems subject to dependent competing risks 被引量:3
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作者 ZHAO Shuai MAKIS Viliam +1 位作者 CHEN Shaowei LI Yong 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2018年第2期436-444,共9页
This paper proposes a health evaluation method for degrading systems subject to competing risks of dependent soft and hard failures. To characterize the time-varying degradation rate, the degradation process is determ... This paper proposes a health evaluation method for degrading systems subject to competing risks of dependent soft and hard failures. To characterize the time-varying degradation rate, the degradation process is determined by a non-stationary Gamma process and the soft failure is encountered when it exceeds a predefined critical level. For the hard failure, a Cox’s proportional hazard model is applied to describe the hazard rate of the time to system failure. The dependent relationship is modeled by incorporating the degradation process as a time-varying covariate into the Cox’s proportional hazard model. To facilitate the health characteristics evaluation, a discretization technique is applied both to the degradation process and the monitoring time.All health characteristics can be obtained in the explicit form using the transition probability matrix, which is computationally attractive for practical applications. Finally, a numerical analysis is carried out to show the effectiveness and the performance of the proposed health evaluation method. 展开更多
关键词 competing risk conditional mean residual life health evaluation non-stationary Gamma process proportional hazards model
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Dependence Rayleigh competing risks model with generalized censored data 被引量:1
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作者 WANG Liang MA Jin’ge SHI Yimin 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2020年第4期852-858,共7页
The inference for the dependent competing risks model is studied and the dependent structure of failure causes is modeled by a Marshall-Olkin bivariate Rayleigh distribution. Under generalized progressive hybrid censo... The inference for the dependent competing risks model is studied and the dependent structure of failure causes is modeled by a Marshall-Olkin bivariate Rayleigh distribution. Under generalized progressive hybrid censoring(GPHC), maximum likelihood estimates are established and the confidence intervals are constructed based on the asymptotic theory. Bayesian estimates and the highest posterior density credible intervals are obtained by using Gibbs sampling. Simulation and a real life electrical appliances data set are used for practical illustration. 展开更多
关键词 dependence competing risks bivariate distribution generalized progressive hybrid censoring(GPHC) likelihood estimation Bayesian analysis
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Fuzzy Logic Based Evolving System and One Kind of Competition Mechanism
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作者 Zhongxiong, Hu Wanjun & Peng Fei Automation System Institute, Northern Jiaotong University, Beijing 100044, P. R. China 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1997年第4期72-78,共7页
In this paper, an evolving system is introduced. That any system is evolving means that any entity in the system is in developing state and entities compete with each other. Any entity can be represented by developmen... In this paper, an evolving system is introduced. That any system is evolving means that any entity in the system is in developing state and entities compete with each other. Any entity can be represented by development of the entity and its environment consisting of a closed cycle. Any subsystem is assigned by a management. The competing controller controls competing entities and arranges them in any advantage order by its common rules and local rules of any subsystem. Each entity can use its competing rules to change the evaluation by any subsystem containing it. This kind of changes leads the entity into its increase of the position in an advantage order. 展开更多
关键词 Fuzzy logic Evolving system competing controller.
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Statistical inference for dependence competing risks model under middle censoring
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作者 WANG Yan SHI Yimin WU Min 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2019年第1期209-222,共14页
Middle censoring is an important censoring scheme,in which the actual failure data of an observation becomes unobservable if it falls into a random interval. This paper considers the statistical analysis of the depend... Middle censoring is an important censoring scheme,in which the actual failure data of an observation becomes unobservable if it falls into a random interval. This paper considers the statistical analysis of the dependent competing risks model by using the Marshall-Olkin bivariate Weibull(MOBW) distribution.The maximum likelihood estimations(MLEs), midpoint approximation(MPA) estimations and approximate confidence intervals(ACIs) of the unknown parameters are obtained. In addition, the Bayes approach is also considered based on the Gamma-Dirichlet prior of the scale parameters, with the given shape parameter.The acceptance-rejection sampling method is used to obtain the Bayes estimations and construct credible intervals(CIs). Finally,two numerical examples are used to show the performance of the proposed methods. 展开更多
关键词 MIDDLE CENSORING DEPENDENT competing RISKS model Marshall-Olkin BIVARIATE Weibull (MOBW) distribution acceptancerejection sampling.
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Exact inference for two exponential populations with competing risks data
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作者 Song Mao Yimin Shi Liang Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第4期711-720,共10页
In a reliability comparative test, the joint censoring model is usually adopted to evaluate the performances of units with the same facility. However, most researchers ignore the pos- sibility that there is more than ... In a reliability comparative test, the joint censoring model is usually adopted to evaluate the performances of units with the same facility. However, most researchers ignore the pos- sibility that there is more than one factor for the failure when a test unit fails. To solve this problem, we consider a joint Type-II hybrid censoring model for the analysis of exponential competing failure data. Based on the maximum likelihood theory, we compute the maximum likelihood estimators (MLEs) of parameters and then obtain the condition ensuring MLEs existence for every unknown parameter. Then we derive the conditional exact distributions and corresponding moment properties for parameters by the moment generating function (MGF). A Monte-Carlo simulation is conducted to compare the performances of different ways. And finally, we conduct a numerical example to illustrate the proposed method. 展开更多
关键词 joint Type-II hybrid censoring competing causes mo-ment generating function likelihood inference exponential distri-bution.
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Development and Application of a Transformation-competent Artificial chromosome (TAG) Genomic DNA Library in Allotetrapolid Cotton (Gossypium hirsutum L. )
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作者 Xiao-e LIANG, Jin-feng SUO, Yong-biao XUE(Institute of Genetics and Developmental Biology, The Chinese Academy of Sciences,Beijing 100080, China) 《棉花学报》 CSCD 北大核心 2002年第S1期52-52,共1页
The technology of cloning and transferring oflarge DNA fragments in plants is important forhigh-efficient identification of new genes andstudy of gene functions.Tranformation-competent artificial chromosome(TAC)vector... The technology of cloning and transferring oflarge DNA fragments in plants is important forhigh-efficient identification of new genes andstudy of gene functions.Tranformation-competent artificial chromosome(TAC)vectorsystem has been shown to be very useful forefficient gene isolation in Arobidopsis thaliana.In order to develop an efficient platform for 展开更多
关键词 GOSSYPIUM TAG COTTON chromosome competENT TRANSFORMATION cloning GENOMIC COTTON DNA
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全国31省医院感染管理专职人员岗位胜任力现状调查 被引量:2
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作者 刘欣 谢梦耐 +5 位作者 孙吉花 宋洪芳 刘芳 樊国爱 魏佳 蔡虻 《中国感染控制杂志》 北大核心 2025年第3期354-360,共7页
目的了解全国各级各类医疗机构医院感染管理专职人员岗位胜任力现状,为专业培训、能力提升及职业规划提供信息和依据。方法采用分层抽样的方法选取全国31个省级行政区域医疗机构的医院感染管理专职人员为研究对象。调查问卷内容设计包... 目的了解全国各级各类医疗机构医院感染管理专职人员岗位胜任力现状,为专业培训、能力提升及职业规划提供信息和依据。方法采用分层抽样的方法选取全国31个省级行政区域医疗机构的医院感染管理专职人员为研究对象。调查问卷内容设计包括被调查人员基本信息、胜任日常工作情况评价、工作满意程度和对医院感染管理专职人员管理的意见和建议四个部分。胜任日常工作情况评价分为13个维度,按照非常不胜任到非常胜任5个程度进行评价。比较分析不同专业背景医院感染管理专职人员的得分情况。结果回收有效问卷8709份,被调查人员来自三级医疗机构3475名,二级医疗机构3697名,一级及未定级医疗机构1537名。医院感染管理专职人员的胜任力评价总均分为(4.17±0.80)分。不同专业背景人员得分由高到低依次为护理(4.12±0.81)分,医疗(4.07±0.86)分,预防医学(3.93±0.92)分,检验(3.88±0.93)分,药学(3.86±0.94)分,卫生管理(3.85±0.95)分。对于医院感染管理专职人员核心能力,如医院感染病例监测与分析、识别和调查医院感染暴发两项对医疗专业背景人员评价得分最高(均P<0.05);对于医院感染预防与控制基础工作,如检查指导规章制度落实、指导职业防护、管理与沟通、实施医院感染管理培训等,护理专业背景人员评价得分最高(均P<0.05)。医院感染管理专职人员对接受培训情况比较满意,预防医学专业背景人员在接受培训情况、职业发展、岗位待遇方面满意度较低(均P<0.05)。结论不同专业背景医院感染管理人员岗位胜任力差异较大,需优化分工,发挥所长,为推进专业化、职业化的医院感染管理队伍建设提供思路与模式。 展开更多
关键词 医院感染管理 专职人员 岗位胜任力 核心能力
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促进学生学科能力发展的循证教学设计模型构建 被引量:3
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作者 郭炯 潘霞 张虹 《电化教育研究》 北大核心 2025年第6期57-65,共9页
随着核心素养教育不断深入,探索贯通核心素养的新型教学范式愈发受到关注。学科能力作为核心素养在学科领域的直观映射,其于教学中的有效发挥,是推动核心素养在课堂层面实践转化的关键。为此,文章采用结构功能分析法,通过解构学科能力... 随着核心素养教育不断深入,探索贯通核心素养的新型教学范式愈发受到关注。学科能力作为核心素养在学科领域的直观映射,其于教学中的有效发挥,是推动核心素养在课堂层面实践转化的关键。为此,文章采用结构功能分析法,通过解构学科能力内在学习逻辑及其形成机理,探寻适配学科能力进阶特征的有效教学方式。基于有效教学需求,引入5A循证实施框架,采用德尔菲法制订证据评价标准,并借鉴设计模式解决同类问题的理念,从搜寻与应用有效证据视角设计教学,同时综合技术势能,构建促进学生学科能力发展的循证教学设计模型。该模型以学科能力发展为导向,通过结构化教学内容定位学科能力,依托问题化教学目标搭建能力要素与教学实践的联结通道,继而循证化设计教学情境与活动,形成“定位—联结—实施”的学科能力培养动态闭环,以期通过开展学科能力贯穿全程的有效教学,为学生学科能力发展提供有力保障,助力核心素养在课堂教学中切实落地。 展开更多
关键词 学科能力 循证教学设计 核心素养 证据
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AI时代的文学胜任力 被引量:4
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作者 王卓 《山东外语教学》 北大核心 2025年第1期10-17,共8页
文学不仅对推动人类文明发展起着重要作用,对于人的塑形和核心竞争力而言,文学胜任力(Literary Competence)更是不可或缺的能力。在数字技术迅猛发展的今天,文学胜任力的价值更不容忽视。人们通常把文学视为一种素养,这也是英文中常用... 文学不仅对推动人类文明发展起着重要作用,对于人的塑形和核心竞争力而言,文学胜任力(Literary Competence)更是不可或缺的能力。在数字技术迅猛发展的今天,文学胜任力的价值更不容忽视。人们通常把文学视为一种素养,这也是英文中常用把“文学”和“素养”放在同一语境下使用的原因。然而,从文学与文明、文学与世界、文学与人生的互动关系来看,文学更是一种胜任力,是有效地解决现实问题的多维能力。文学胜任力是在读者对文本加工的过程中,以语言能力和阅读能力为基本技能,通过共情能力、审美能力、文化和话语能力、阐释能力、想象力和文学数字能力在内文本中参与文本意义生成,在外文本中参与社会文化建构的能力。文学胜任力是读者在文学设定的特定语境下,勾连自我、他人和世界的能力,从而建立个人的内在世界与他人的公共世界之间的有机联系,完成阅读文学即“阅读世界”的闭环过程的能力。 展开更多
关键词 AI时代 文学胜任力维度 文学胜任力模型
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嵌入式人工智能系统实验课程改革与探索 被引量:4
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作者 李磊 高学 +1 位作者 秦慧平 余翔宇 《实验室研究与探索》 北大核心 2025年第3期147-152,共6页
为适应人工智能技术的飞速发展,对嵌入式系统课程进行全面、深入的改革、优化并整合课程知识体系。在保障核心知识点教学的前提下,合理调整学时分配,为人工智能实验的顺利开展奠定了坚实基础。通过引入嵌入式人工智能实验项目,构建符合... 为适应人工智能技术的飞速发展,对嵌入式系统课程进行全面、深入的改革、优化并整合课程知识体系。在保障核心知识点教学的前提下,合理调整学时分配,为人工智能实验的顺利开展奠定了坚实基础。通过引入嵌入式人工智能实验项目,构建符合行业技术和人才培养需求的嵌入式人工智能课程体系。采用“基础+综合项目”的教学模式,既实现了嵌入式系统教学的循序渐进与系统性,又以学生兴趣为导向,有效培养学生的嵌入式工程实践能力,激发学生的主动性和创新动力。课程改革经验也可为其他院校提供参考。 展开更多
关键词 人工智能 嵌入式系统 教学改革 工程能力 创新能力
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面向准确与效率的数学学科能力自适应测评研究——基于知识空间理论的视角 被引量:1
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作者 郭炯 荣乾 《中国电化教育》 北大核心 2025年第3期103-110,共8页
在新时代教育教学改革的背景下,学科能力的培养是保障核心素养得以有效落实的关键途径。鉴于学科能力的多维度性和复杂性,如何准确、高效地评估学生的学科能力是学科能力培养亟待解决的问题。传统纸笔测试和现有的自适应测评研究主要聚... 在新时代教育教学改革的背景下,学科能力的培养是保障核心素养得以有效落实的关键途径。鉴于学科能力的多维度性和复杂性,如何准确、高效地评估学生的学科能力是学科能力培养亟待解决的问题。传统纸笔测试和现有的自适应测评研究主要聚焦于知识评估,对学生学科能力的测量仍显不足。基于此,该研究首先梳理了学科能力的内涵,明确了测评的逻辑起点。其次,从知识空间理论视角出发,构建了包含内容、评价和结构三类要素的数学学科能力映射模型,实现了从知识评估转向能力评估。此外,还提出了基于拉普拉斯平滑的能力状态更新规则和基于信息熵的停止规则以优化测评过程。实证研究结果表明,该方法在数学学科能力评估方面展现出较高的准确性和效率,为实现面向能力的学生个性化辅导提供了支持,为数学学科能力的精准测量和评估提供新的思路和方法。 展开更多
关键词 学科能力 知识空间理论 自适应测评 能力结构 能力状态
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学科核心素养德育维度的实践审视及路径重构 被引量:1
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作者 郭程轩 《课程·教材·教法》 北大核心 2025年第1期85-91,107,共8页
“德才兼备”或“品学兼优”为我们理解学科核心素养提供了德育和智育的双重视角。当前学界对关键能力导向的智育核心素养的实践路径具有较高的共识度,在德育维度的核心素养培育方面却面临着认识上“在位”和实践上“缺位”的困境。归... “德才兼备”或“品学兼优”为我们理解学科核心素养提供了德育和智育的双重视角。当前学界对关键能力导向的智育核心素养的实践路径具有较高的共识度,在德育维度的核心素养培育方面却面临着认识上“在位”和实践上“缺位”的困境。归因于教学过程中长期存在的学科智育核心素养路径窄化引发的德育核心素养的实践误区。学科德育核心素养的实践需建立在学生与知识、情境的情感互动之上,教学过程中应通过学科知识道德内涵的挖掘、教学过程中多元情境的创设以及学习过程中的情感关联互动等来重构学科德育核心素养的实践路径,以促进学科核心素养整体育人价值的实现。 展开更多
关键词 学科核心素养 德育 智育核心素养 德育核心素养
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