用户对图书馆资源发现系统功能的期望——基于广州大学城高校图书馆学生用户的调研

以广州大学城8所高校图书馆的学生用户为调查对象,通过问卷调查,了解用户对资源发现系统各项功能的价值感知。调查总结出用户认为最有用的十大功能,发现研究生比本科生更加注重系统中资源揭示方面的功能。最后,着眼于图书馆部署资源发现系统的现实需求和高校图书馆的现状,结合调查结果,为图书馆引进资源发现系统提供参考性意见。     

IEEE 802.11无线网状网中的一种干扰感知的多径路由协议

基于IEEE 802.11 MAC层协议模型,提出一种新颖的能够描述多条路径之间干扰程度的多径路由判据IAMM,并以此为基础,提出一种新的干扰感知的多径路由IAMR协议.IAMR协议通过2次选路,在保证单条路径性能的同时兼顾考虑路径之间的干扰因素.仿真实验表明,IAMR协议在端到端延迟、数据包到达率和吞吐量等方面均有较明显的性能提升.     

跨学科的本质内涵与意义探析

把握“跨学科”的本质内涵,对于开展跨学科活动并促进当代科学技术的进一步发展具有重大意义．从理论层面分析“跨学科”的基本概念和本质,探析发展跨学科的意义,为该主题深入研究提供理论基础．     

Comparing Indirect Effects in SEM: A Sequential Model Fitting Method Using Covariance-Equivalent Specifications

In social science research, an indirect effect occurs when the influence of an antecedent variable on the effect variable is mediated by an intervening variable. To compare indirect effects within a sample or across different samples, structural equation modeling (SEM) can be used if the computer program supports model fitting with nonlinear constraints. However, such an option is not routinely available in every popular software program. In this study, the basic idea of generating covariance-equivalent models in SEM is given and a sequential model fitting method is proposed as an alternative without the need to use nonlinear constraints. Under this method, the hypothesized model is transformed into a set of successive covariance-equivalent models so that an indirect effect is reparameterized as a single model parameter in the final transformed model. Real examples are given to illustrate how the proposed method is implemented using EQS, a SEM program that currently does not support the analysis with nonlinear constraints.     

Predictors of Obligatory Exercise Among Undergraduates: Differential Implications for Counseling College Men and Women

This study examined predictors of obligatory exercise in college undergraduates (N= 172). Regression models indicated that internalization of Western attitudes toward appearance predicted exercise fixation and commitment in women, whereas perceived pressure from dating partners predicted exercise commitment in men. Findings suggest that men may respond more to peer pressure, whereas women may be more susceptible to internalized sociocultural pressure. Implications for differential assessment and treatment of college men and women are discussed.     

从语境顺应看《老友记》不真诚许诺言语行为

许诺是语用学研究中言语行为研究的话题之一。从许诺的言语者是否真心这一角度出发,许诺可分为真诚许诺和不真诚许诺。就目前来看,对于不真诚许诺言语行为的研究显得相对不足。Verschueren等提出的顺应论是从话语出发者和话语解释者的角度对言语进行分析,而并非对言语行为本身进行分析的理论框架。从Verschueren等提出的顺应论中语境顺应的角度出发,分析《老友记》中朋友和恋人之间不真诚许诺的行为,得出以下结论：说话者做出不真诚许诺是对语境的顺应,它具有同许诺一样的言外之力,保证了交际的顺利进行。     

Minimum phase robustness margin for second-order systems with multidirectional perturbations

The problem of minimum phase robustness for a second-order mass-dashpot-spring system is studied. The allowable margin for multidirectional perturbations of the input and output influence matrices is derived in terms of structured singular value to guarantee minimum phase of the system. Within the margin, the minimum phase property can still be ensured even the actuators and sensors are not collocated. To obtain less conservative results, the perturbation matrix with minimal dimension is derived in the paper. Two examples are used to illustrate the proposed approach.     

Does slow and steady win the race?: Clustering patterns of students’ behaviors in an interactive online mathematics game

Educational technology research and development - Online educational games have been widely used to support students’ mathematics learning. However, their effects largely depend on...     

Syntactic and discourse skills in Chinese adolescent readers with dyslexia: a profiling study

This study aims to investigate the relation of syntactic and discourse skills to morphological skills, rapid naming, and working memory in Chinese adolescent readers with dyslexia and to examine their cognitive–linguistic profiles. Fifty-two dyslexic readers (mean age, 13;42) from grade 7 to 9 in Hong Kong high schools were compared with 52 typically developing readers of the same chronological age (mean age, 13;30) in the measures of word reading, 1-min word reading, reading comprehension, morpheme discrimination, morpheme production, morphosyntactic knowledge, sentence order knowledge, digit rapid naming, letter rapid naming, backward digit span, and non-word repetition. Results showed that dyslexic readers performed significantly worse than their peers on all the cognitive-linguistic tasks. Analyses of individual performance also revealed that over half of the dyslexic readers exhibited deficits in syntactic and discourse skills. Moreover, syntactic skills, morphological skills, and rapid naming best distinguished dyslexic from non-dyslexic readers. Findings underscore the significance of syntactic and discourse skills for understanding reading impairment in Chinese adolescent readers.