典型矮塔斜拉桥地震风险概率评估方法研究

鉴于矮塔斜拉桥受力性能的特殊性,引入增量动力分析（IDA）和拉丁超立方体抽样（LHS）评估该结构在地震激励下发生损伤的风险概率。首先采用LHS考虑桥梁构件材料的随机性,与事先选取的地震波相结合形成桥梁-地震动样本集合;其次在确定桥梁有限元模型主要构件损伤指标的基础上采用基于蒙特卡罗（MC）抽样的IDA进行地震易损性分析和地震风险概率评估。为验证方法的正确性和有效性,对一预应力混凝土独塔双索面矮塔斜拉桥结构模型进行地震风险概率评估,结果表明:该方法既充分考虑了材料和地震输入双重随机性又避免了繁琐的积分过程,同时也提高了工程计算的效率及精度。     

A Person-Centered Approach to Students' Evaluations of Perceived Fear Appeals and Their Association With Engagement

A person-centered approach was employed to investigate how students' evaluation of perceived teacher utility value messages, i.e., fear appeals, as a threat and as a challenge, combined within individuals and how these combinations related to student engagement. Two studies were conducted with students in their final two years of secondary education. Empirically distinct clusters emerged at two time points in the academic year. Evaluating the message in the fear appeal at a higher level of challenge than threat was beneficial. Unexpectedly, high threat was associated with high engagement, as long as high challenge was also present, however, this combination was also related to high emotional disaffection. Moderate threat combined with moderate challenge had the most detrimental relationship with student engagement. Educational interventions should aim to increase the likelihood of a challenge evaluation.     

Examining Chi-Square Test Statistics Under Conditions of Large Model Size and Ordinal Data

This study examined the effect of model size on the chi-square test statistics obtained from ordinal factor analysis models. The performance of six robust chi-square test statistics were compared across various conditions, including number of observed variables (p), number of factors, sample size, model (mis)specification, number of categories, and threshold distribution. Results showed that the unweighted least squares (ULS) robust chi-square statistics generally outperform the diagonally weighted least squares (DWLS) robust chi-square statistics. The ULSM estimator performed the best overall. However, when fitting ordinal factor analysis models with a large number of observed variables and small sample size, the ULSM-based chi-square tests may yield empirical variances that are noticeably larger than the theoretical values and inflated Type I error rates. On the other hand, when the number of observed variables is very large, the mean- and variance-corrected chi-square test statistics (e.g., based on ULSMV and WLSMV) could produce empirical variances conspicuously smaller than the theoretical values and Type I error rates lower than the nominal level, and demonstrate lower power rates to reject misspecified models. Recommendations for applied researchers and future empirical studies involving large models are provided.     

“一带一路”沿线国家来华留学生国际化人才培养若干思考

“一带一路”倡议的顺利推进为我国高等教育的国际化发展提供了重大战略机遇,设计出具有针对性、可行性和创新性的来华留学生国际化人才培养规划是促进高校国际化发展的重要举措。文章基于“一带一路”沿线国家的人才需求及特征分析,思考“一带一路”沿线国家来华留学生培养课程体系及人才培养模式,通过建立“四位一体”课程体系和“三阶段七模块”人才培养模式,创新课程体系建设,拓宽人才培养渠道,提高来华留学生的培养质量与水平。     

基于关联分析的计算机软件数据挖掘技术

计算机软件蕴含大量工作信息,有效挖掘软件数据信息之间的内在关联是信息时代对软件应用的潜在要求。针对经典Apriori算法挖掘数据效率低、复杂度高的问题,提出一种改进Apriori算法用于挖掘计算机软件数据的关联规则。为计算机软件算法设置双重支持度阈值,即频繁项集与非频繁项集支持度阈值,快速获得强关联的频繁项集;在此基础上基于映射规则重构事务数据库,压缩数据库规模,减少算法的剪枝操作,降低计算机软件数据关联规则挖掘复杂度。以人力资源类计算机软件数据为例展开关联分析测试,结果显示,该算法挖掘的关联信息与人力资源实际管理情况一致,相比经典Apriori算法其效率有所提升。     

大连大学在全国高校的实然位置及转型发展的 SWOT 策略研究

知己知彼,百战不殆,在激烈的高等教育竞争中,只有准确地定位自己的应然位置和发展目标,才能制定正确的发展战略和策略,使高校立于不败之地。根据近年来在国内比较有影响的四大高校排行榜（武苏连榜、中国校友榜、网大榜、中评榜）历年的统计数据,对大连大学在全国高校中的实然位置和转型发展中的竞争能力进行了SWOT综合分析,提出了通过转型发展和跨越式发展达到学校目标位置——全国一流教学研究型地方大学的若干策略。     

眼动分析法在教育技术领域的应用与趋势

眼动分析法兴起于心理学领域,其客观记录受众视线和认知分析的能力迅速得到众多学科推崇,与视觉信息加工相关的心理机制研究已取得显著成果。教育技术学领域迫切需要利用眼动分析法从受众的视角出发,遵循人的视觉认知规律去探索人机交互过程中如何优化信息的获取和加工过程。目前教育技术领域中引入眼动分析法开展的研究数量较少且尚不全面。随着技术的发展和研究的深入,相信眼动分析法能够使得教育技术学科的研究更加严谨、科学。     

小波包算法在电力系统时变谐波检测中的应用

以matlab工具箱为依托,对采用小波包算法进行谐波检测的方法进行了系统仿真设计,仿真结果表明小波包变换能精确地从谐波信号中分离出基波,并能根据需要分离出任意谐波信号,是一种很好的电力系统谐波分析工具.     

移民与现代重庆方言的形成

重庆方言脱胎于古巴蜀语。自明末清初以来300余年间,由于所处地理位置特殊且重要,重庆地区历经多次重大社会变迁和人口迁徙,受这些因素影响,重庆话逐渐形成了不同于西南官话区其他方言的特色。本文试简述社会变迁对现代重庆方言形成的影响。     

“沂蒙精神”研究论文的计量分析

文章以中国知网(CNKI)的中国期刊全文数据库作为数据源,采用文献计量方法,以沂蒙精神研究论文作为数据样本,从研究论文增长与分布、研究队伍以及热点词频这三个方面展开计量分析,探讨分析沂蒙精神自提出以来研究的发展脉络,并为今后的研究者提供借鉴与参考。