带有常数利息率的相依复合风险模型中有限时破产概率的一致渐近性(英文)

考虑了2个带有常数利息率的相依更新风险模型.首先研究了非复合风险模型,其中索赔额是上尾渐近独立且带有控制变换尾分布的非负随机变量,索赔时间间隔是宽下象限相依的,保费收入过程是一个非负的随机过程,利用风险理论中的方法,得到了有限时破产概率在某个有界区间上的一致渐近性.在此基础上,利用随机和尾渐近性的分析方法,进一步研究获得了更为复杂且合理的复合相依更新风险模型中有限时破产概率的一致渐近性公式,其中单个索赔额特殊化为广义负相依的,并且事故时间间隔仍然保持宽下象限相依的,索赔额和索赔次数均为控制变换尾的.     

多元t-copula尾相依的单调性

考虑了多元t-copula的上尾象限相依指数和上尾极值相依指数,该t-copula是在相依结构下定义的．由于多元连续型随机变量的copula函数关于严格单调递增变换具有不变性质,由此推导了多元t-copula的尾相依指数的精确表达式,得到的结果明显比以往文献给出的结论更加简洁．然后,讨论了这2个相依指数关于相关系数的局部单调性质：上尾极值相依指数关于相关系数是严格单调递增的,但上尾象限相依指数的单调性比较复杂．通过蒙特卡罗模拟数据验证了结果的正确性．同时,发现所有结论可以推广到生成随机变量是正则变化的分布类中．     

回归函数的非参数分块Delta序列估计

在非参数回归模型中,本文提出一种回归函数的分块Delta序列估计方法,定义了回归函数的分块Delta序列估计,得到这种估计的渐近无偏性,均方收敛性和强性敛性.     

非扩张映象的具误差的两步粘性迭代逼近

引入非扩张映象的具误差的两步粘性迭代序列,得出了Banach空间中非扩张映象的具误差的两步粘性迭代序列的收敛性及强收敛于其不动点的条件.从而将文[1-2]的一步粘性迭代推广到具误差项的两步迭代.结果改进和推广了最新的一些结果.     

程式化语言在中国英语学习者汉译英中的使用及其特征

基于中国大学生英汉汉英口笔译语料库（PACCEL）,研究程式化语言在中国大学生汉译英中的使用并总结其特征。结果表明：1．学生的程式化语言正确运用能力与学生的翻译成绩呈显著正相关;2．学生在翻译过程中选择短语层面程式化语言的频次很高;3．高分组与低分组学生的程式化语言使用频率呈现显著差异。学生的程式化语言使用能力能够预测他们的翻译水平,应当重视程式化语言教学,提高他们的运用能力。     

重尾随机和的精致大偏差及其在风险理论中的应用

对2列非负带有次指数分布的独立同分布随机变量的差,以及随机脚标为负相协随机变量生成的严平稳更新记数过程进行了探讨.利用修正的随机变量部分和的精致大偏差结果及关于负相协随机变量的基本更新定理和中心极限定理,得到了随机变量列差的随机和的精致大偏差.考虑了基于顾客来到过程的保险风险模型,利用随机和的精致大偏差结果,得到了当顾客数或者时间趋于无穷时,保险公司破产概率的一致渐近性.     

随机变量序列发生频率的强偏差定理

利用似然比是几乎处处收敛的上鞅的分析方法，研究了连续型随机变量序列在任意区间上发生的频率与它们落在该区间上的概率的平均值的关系，建立并完善了一类强偏差极限定理，改进了文[1]～[3]的主要结果。     

Value System Similarity and the Supervisory Relationship

This study assesses the value systems held by supervisors and supervisees in the counseling practice. The relation between value system similarity and two dependent measures was examined; the level of communication within and the overall satisfaction with the relationship. Participants included 37 student supervisees and seven supervisors in a master's program. Correlation coefficients were computed to establish the relationships between the dependent measures and between value similarity measures and the dependent variables. The results did not indicate a meaningful relation between the similarity of value systems for supervisee and supervisor and either dependent measure. The results, however, did indicate a strong relationship between the supervisee's satisfaction with the supervisory relationship and the level of communication that was developed in supervision.     

不同分布的(ρ~)混合序列加权和的收敛性

讨论了不同分布^-ρ混合序列加权和的完全收敛和强收敛,推广了Stout和Thrum定理。     

多值Φ-强伪压缩映像不动点的集合序列的Ishikawa迭代逼近

在一致光滑的实Banach空间中,研究多值Φ强伪压缩映像集合序列生成的Ishikawa迭代序列逼近问题,给出了迭代集合序列逼近多值Φ强伪压缩映像不动点集合的强收敛定理,是Ishikawa迭代序列逼近多值Φ强伪压缩映像不动点问题的推广。     

Variability in the Play of Preschoolers with Cognitive Delays Across Different Toy Sets

The variability in the play of 30 preschool children with cognitive delays associated with different toy sets was examined. Twelve dependent variables representing categorical and sequential play were coded from videotaped home‐based independent play sessions using a continuous 15 s interval coding procedure. Analyses of toy effect were conducted both across and within toy sets. Sex by toy set interaction effects emerged for exploration, pretend, ordered multischeme sequences, and global play sophistication. Main effects across toy sets were noted for nonplay, functional play, construction, overall proportion of play, time spent sequencing activities, and length of play sequences. The pattern of play observed within each toy set was strikingly similar across each of the three toy sets. The implications of these results for practice are discussed.     

渐近非扩张映象公共不动点具误差的弱和强收敛定理

设E是一致凸的Banach空间,C是E的非空有界闭凸子集．本文证明了,在一定条件下,三个渐近非扩张映象公共不动点具误差的迭代序列的弱和强收敛定理．本文结果也推广和改进了最近一些人的最新结果．     

Factors influencing pro-environmental collaborative collective behaviors toward sustainability transition – a case of renewable energy

The transformation to sustainable social systems requires both individual and collective pro-environmental behaviors. In this study, we quantified the impacts of factors that promote or impede collective pro-environmental behaviors around the use of renewable energy. An online questionnaire was completed by Japanese high school and college students, and covariance structure analysis was performed on groups with strong or weak intention to participate in collective behaviors and groups with rich or little experience with community activities. Our results revealed that the belief that a global environmental crisis can be avoided by individual efforts was negatively related to collective behavioral intention. We also found that environmental education that aimed to enhance attachment to community and social norms, would be effective for the youth with weak collective behavioral intention, but not so for youth with strong collective behavioral intention. It would be more effective for youth with strong collective behavioral intention to learn the practical approaches for community participation and raise awareness of the perceived importance of collective pro-environmental behaviors.     

Banach空间中一类广义混合平衡问题系统解的存在性及算法

在实Banach空间中引入和研究了一类新的广义混合平衡问题组.首先考虑了一个辅助混合平衡问题组,通过它与广义混合平衡问题组的等价性,证明了它的解的存在性和唯一性;其次构造了广义混合平衡问题组的近似解的迭代算法.在一定的条件下,证明了由算法生成的迭代序列的强收敛性,这些结果推广并改进了近期的某些结果.     

The roles of teacher–student relationship quality and self-concept of ability in adolescents’ achievement emotions: temperament as a moderator

This study examined to what extent teacher–student conflict and closeness, on the one hand, and students’ self-concepts of ability in literacy and mathematics, on the other, are related to students’ achievement emotions (enjoyment, anxiety and boredom) in mathematics and literacy among Finnish early adolescents (N = 854). We also investigated the extent to which these associations are moderated by student temperament (surgency/extraversion, negative affectivity and effortful control). The results showed, after accounting for relevant covariates, that in both school subjects, teacher–student conflict was negatively related to enjoyment and positively to anxiety and boredom, whereas teacher–student closeness was positively related to enjoyment and negatively to boredom. Self-concepts of ability in both school subjects were positively related to enjoyment and negatively to anxiety, whereas the self-concept of ability was only negatively related to boredom in mathematics. Student temperament also moderated some of the associations in the literacy domain. Lower levels of conflict in the teacher–student relationship were related to higher levels of enjoyment in literacy, particularly among students who had lower levels of surgency/extraversion. Also, a closer relationship with the teacher or a lower self-concept of ability in literacy was related to higher levels of anxiety, particularly among students who had low effortful control. In the mathematics domain, the associations between the self-concept of ability and achievement emotions were somewhat stronger than in literacy, and the domain-specific associations were not dependent on student temperament.

     

Reconsidering the Relationship Between Student Engagement and Persistence in College

Using data from two rounds of surveys on students in the Washington State Achievers (WSA) program, this study examined the relationship between student engagement in college activities and student persistence in college. Different approaches using student engagement measures in the persistence models were compared. The results indicated that the relationship between student engagement and the probability of persisting was not linear. Even though a higher level of social engagement was related to an increased probability of persisting, a higher level of academic engagement was negatively related to such probability. The findings have strong implications for educational research, policy, and practice.     

The effect of sequence of instruction on students' cognitive preferences and recall in the context of a problem-oriented method of teaching

This experiment investigated two possible sequences in which biochemical theory and the clinical applications of such theory can be presented to pre-clinical medical students. The dependent variables were the students' cognitive preferences and their ability to recall the contents of the instruction. Seventy-two students were randomly allocated to either a Theory-to-application or an Application-to-theory condition. The results indicated that the Application-to-theory sequence of instruction produced a significantly greater preference for being taught the specific facts of pre-clinical medical science, as opposed to being taught about the clinical applications. However, this was achieved at the expense of a significantly reduced ability to actually recall the theory which was taught.     

语言型大学学生二外日语学习动机与成绩的相关性研究

动机是影响二语学习诸个体因素中最具能动性的因素,对于语言学习的结果具有较强的预测性。本研究运用定量研究的方法,以语言型大学二外日语学习者为对象,进行问卷调查,通过因子分析和多元回归分析考察语言型大学二外日语学习者的学习动机与成绩之间的相关性。研究结果显示:考试竞争型、兴趣型及成就型动机与成绩呈明显的正相关,而盲目从众型动机对成绩呈负相关。     

Influence of deviant behaviours in workgroups in relation with group composition

The potential for behaviourally challenged students to negatively impact typically developing students is a concern shared by many parents and teachers. However, deviant peer influence during workgroup activities has not been thoroughly investigated through systematic observation of deviant interactions. This study compares sequences of deviant behaviours and peer responses recorded during cooperative activities. Seventy fifth-grade elementary school students were observed in three specific contexts, homogeneous EBD workgroups, homogeneous regular workgroups and inclusive workgroups. Findings reveal a greater prevalence of verbal aggressions and more explosive exchanges in EBD workgroups. In groups consisting solely of typically developing students, intentionally ignoring disruptive teammates proved to be effective in stopping deviant behaviours. Finally, it was in inclusive workgroups that observed deviant interactions sequences were the longest. These findings are discussed in relation with the role of group composition and workgroup training in fostering effective cooperative learning environments.     

河南省城市化水平的综合评价及时空演化特征

利用主成分分析法,并借助ArcView GIS软件将分析结果与图形数据相结合,对河南省18个地市三个年份的城市化水平进行了综合评价.结果表明:河南省城市化水平在空间上呈现出中心-外围结构,中心有向豫中地区偏移的趋势,且这种结构具有很强的历史依赖特征;城市化发展阶段相同的地区应针对内部特征实行有差异的城市化发展策略.