Constructing Finite Least Kripke Models for Positive Logic Programs in Serial Regular Grammar Logics

A serial context-free grammar logic is a normal multimodal logicL characterized by the seriality axioms and a set of inclusionaxioms of the form _ts1..._sk. Such an inclusion axiom correspondsto the grammar rule t s₁... s_k. Thus the inclusion axioms ofL capture a context-free grammar . If for every modal index t, the set of words derivable fromt using is a regular language, then L is a serial regular grammar logic. In this paper, we present an algorithm that, given a positivemultimodal logic program P and a set of finite automata specifyinga serial regular grammar logic L, constructs a finite leastL-model of P. (A model M is less than or equal to model M' iffor every positive formula , if M then M' .) A least L-modelM of P has the property that for every positive formula , P iff M . The algorithm runs in exponential time and returnsa model with size 2^O(n³). We give examples of P and L, for bothof the case when L is fixed or P is fixed, such that every finiteleast L-model of P must have size 2⁽ⁿ⁾. We also prove that ifG is a context-free grammar and L is the serial grammar logiccorresponding to G then there exists a finite least L-modelof _s p iff the set of words derivable from s using G is a regularlanguage.     

Consumer ethnocentrism,cultural sensitivity,and intention to purchase local products—evidence from Vietnam

• This study empirically investigates the impacts of consumer ethnocentrism and cultural sensitivity on both imported product judgment and intention to purchase local products in the context of a developing country—Vietnam. Structural equation modeling was used to test these impacts, utilizing a sample of 549 consumers. The results show that consumer ethnocentrism is negatively related to imported product judgment and positively related to intention to purchase local products. In addition, cultural sensitivity has a positive relationship with imported product judgment but not with consumer ethnocentrism. The results also indicate that the impacts of consumer ethnocentrism on imported product judgment and on intention to purchase local products are not different in terms of product categories, gender, income, and education levels. However, differences exist between younger and older consumers.

Copyright © 2008 John Wiley & Sons, Ltd.     

语言转换影响双语认知优势的发展进程

本研究包括两部分,第一部分对双语转换问卷进行修订,用于客观测量双语者的语言转换能力;第二部分采用数字命名任务考察语言转换对双语认知优势发展进程的影响。结果发现,在低水平阶段,语言转换频率与转换消耗存在显著负相关;在高水平阶段,语言转换频率与转换消耗、混用消耗均存在显著负相关。结果说明,语言转换首先影响瞬时转换能力,积累一定的经验之后,才会对持续监控能力与抑制控制能力产生积极影响。本研究结果表明,双语认知优势效应的发展具有一定的顺序性。     

甲流了解程度、疫苗安全感知、接种行为及其影响机制

采用问卷调查的方法, 对甲流了解程度、疫苗安全感知、接种行为及其影响机制进行了研究, 并运用结构方程对提出的模型进行了验证和调整。结果表明：(1)民众对甲流疫情基本情况、疫苗接种要求和传播途径等方面有较高的了解程度, 但对预防措施和疫苗信息了解较少。(2)交流卷入对了解程度不存在显著影响; 而新闻卷入对了解程度有显著正向影响, 并且新闻卷入对感知疫苗安全程度的正向影响受到了解程度的部分中介。(3)感知甲流疫苗越安全, 越倾向于选择接种疫苗。(4)人格对疫苗的风险认知存在显著影响, 个人随和性(Agreeableness)程度越高, 则感知疫苗的安全程度越高, 而年龄和性别对其均没有显著影响。     

Experiences and Beliefs as Predictors of Ethnic Identity and Intergroup Relations

Factors affecting ethnic identity and other group orientation were assessed in 115 college students from 5 ethnic groups. Ethnic group self‐identification, negative and positive interracial experiences, perceptions of racial bias, social support, just‐world beliefs, and psychological distress were each associated with various components of ethnic identity and are discussed within a counseling perspective. Los factures que afectan la identidad étnica y otras orientaciónes hacia grupos fueron evaluados en 115 estudiantes colegiales de 5 grupos étnicos. La identificación de grupo etnico propio, las experiencias interraciales negativas y positivas, las percepciones del prejuicio racial, apoyo social, creencias en un mundo justo, y la afflicción psicológica fueron asociadas con varios componentes de la identidad étnica y son discutidos dentro de la perspectiva de la consejería.     

Do Our Facebook Friends Make Us Feel Worse? A Study of Social Comparison and Emotion

People often compare themselves to others to gain a better understanding of the self in a process known as social comparison. The current study discusses how people engage in a social comparison process on Facebook, and how observing content from their Facebook friends may affect their emotions. A 2 (comparison direction) × 2 (relational closeness) × 2 (self‐esteem) between‐subjects experiment was conducted with 163 adult participants. The results revealed a significant 3‐way interaction such that people with high self‐esteem would be happier receiving positive information than negative information from their close friends, but the effect would be the opposite if the information was from a distant friend. There was no such difference for people with low self‐esteem.     

汉语作为第二语言的越南大学生汉字部件意识的发展*

以226名将汉语作为第二语言的越南大学一到四年级学生为研究对象,以低频独体字、部件熟悉假字和部件不熟悉假字为材料,采用延迟书写任务,考察了不同年级的越南大学生汉字部件意识的发展及其影响因素。结果发现：（1）学习3个月汉语的大一学生能以部件作为汉字加工单元,其延迟书写部件熟悉假字显著好于低频独体字,并与高年级学生没有差异,说明越南大学生很早就发展出了汉字部件意识;（2）不同年级大学生书写部件不熟悉假字的成绩都显著低于部件熟悉假字,也低于低频独体字,表明部件构字能力是越南大学生汉字书写的重要影响因素。（3）越南大一学生的汉字书写成绩受到汉字结构的影响,左右结构优于上下结构,但其他年级的成绩不受汉字结构的影响。     

Individual differences in the preference for worked examples: Lessons from an application of dispositional learning analytics

Worked-examples have been established as an effective instructional format in problem-solving practices. However, less is known about variations in the use of worked examples across individuals at different stages in their learning process in student-centred learning contexts. This study investigates different profiles of students' learning behaviours based on clustering learning dispositions, prior knowledge, and the choice of feedback strategies in a naturalistic setting. The study was conducted on 1,072 students over an 8-week long introductory mathematics course in a blended instructional format. While practising exercises in a digital learning environment, students can opt for tutored problem solving, untutored problem solving, or call worked examples. The results indicated six distinct profiles of learners regarding their feedback preferences in different learning phases. Finally, we investigated antecedents and consequences of these profiles and investigated the adequacy of used feedback strategies concerning ‘help-abuse’. This research indicates that the use of instructional scaffolds as worked-examples or hints and the efficiency of that use differs from student to student, making the attempt to find patterns at an overall level a hazardous endeavour.     

语义距离与创造性思维关系的元分析

自然语言处理的发展为探究语义距离与创造性思维的关系提供了可靠且有效的研究方法。近些年关于两者之间关系的研究逐渐增多,但研究结论并不一致。本研究基于创造力联想理论及扩散激活模型,通过元分析的方法探讨了语义距离与创造性思维的整体关系,并且分析了以往研究结论不一致的原因。本文经过文献检索和筛选后获得14项研究,提取r值作为效应值(共53个效应值,4729个独立样本),并使用随机效应模型进行了元分析。结果显示：语义距离与创造性思维存在中等程度的正相关(r=0.379, 95%CI [0.300, 0.452]);二者的相关强度受到被试年龄和创造性思维不同测量指标的调节。研究结果表明语义距离与创造性思维关系密切,同时解释了以往研究结论不一致的原因。上述结果不仅能为更深入地探讨创造性思维的认知神经机制提供新的研究视角和理论解释,而且有助于更全面地理解语义距离与创造性思维二者的关系及其边界条件,为更好地解释、预测和提升创造力提供科学依据和重要启示。