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Forrest C. Lane Baaska Anderson Hector F. Ponce Prathiba Natesan 《Library & information science research》2012
LibQUAL+® is an instrument purported to measure three dimensions of library service quality: service affect, library as a place, and information control. After changes were made to the instrument in 2003, however, no confirmatory factor analyses have been published in peer-reviewed journals affirming the three-factor structure of LibQUAL+®. These deficiencies were addressed by testing the hypothesized three-factor structure and the stability of that structure over time. Specifically, data from three samples (n = 550; n = 3261; n = 2103) were collected over a five-year period and analyzed using a multi-group confirmatory factor analysis. Results suggest that the theoretical model fit the data across the three samples and demonstrates factorial invariance over time. Multicollinearity between affect of service and information control, however, indicate that service quality may be measured as two dimensions rather than three, providing a more parsimonious explanation of service quality. 相似文献
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This paper addresses the problem of the automatic recognition and classification of temporal expressions and events in human language. Efficacy in these tasks is crucial if the broader task of temporal information processing is to be successfully performed. We analyze whether the application of semantic knowledge to these tasks improves the performance of current approaches. We therefore present and evaluate a data-driven approach as part of a system: TIPSem. Our approach uses lexical semantics and semantic roles as additional information to extend classical approaches which are principally based on morphosyntax. The results obtained for English show that semantic knowledge aids in temporal expression and event recognition, achieving an error reduction of 59% and 21%, while in classification the contribution is limited. From the analysis of the results it may be concluded that the application of semantic knowledge leads to more general models and aids in the recognition of temporal entities that are ambiguous at shallower language analysis levels. We also discovered that lexical semantics and semantic roles have complementary advantages, and that it is useful to combine them. Finally, we carried out the same analysis for Spanish. The results obtained show comparable advantages. This supports the hypothesis that applying the proposed semantic knowledge may be useful for different languages. 相似文献
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Secondary school students have been experiencing stress related to examination and academic performance in Hong Kong: the Special Administrative Region of the Chinese Mainland. The article reports a case study which applied the student empowerment model originated from western societies and the 'Qing' concept of Chinese philosophy to formulate a student Quality Student Leadership (QSL) programme in a secondary school. The programme aimed to reduce the stress of the students and at the same time improve their initiative, leadership, and also the relationship between the students and with the parents and teachers. The results showed that the programme was effective in achieving its objectives. 相似文献
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Vladimir Macias Israel Becerra Edgar Martinez Rafael Murrieta-Cid Hector M. Becerrra 《Journal of The Franklin Institute》2021,358(9):4761-4792
In this paper, we propose a feedback-based control approach to execute the time optimal motion trajectories for a differential drive robot. These trajectories are composed of straight lines and rotations in place. We show that the evolution of the position of a single landmark over time, in a local reference frame, makes it possible to track a prescribed time-optimal robot’s trajectory, based on feedback of the landmark’s position. We also show that the closed-loop system is an exponentially stable one with a nonvanishing perturbation, and that globally uniformly ultimately boundedness of the tracking errors can be achieved. The two main results of this work are: 1) Our approach leverages visual servo control type of methods with tools from optimal control for executing time-optimal trajectories in the state space based on feedback information. 2) The approach is able to work with the minimum number of landmarks–only one–this represents a necessary and sufficientcondition for landmark-based navigation. Experiments in a physical robot, a nonholonomic differential drive system equipped with an omnidirectional laser sensor, are shown, which validate the proposed theoretical modelling. 相似文献
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Identification and description of controlled clinical trials in Spanish language dental journals 
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Explaining student and home variance of Chinese reading achievement of the PIRLS 2011 Hong Kong 下载免费PDF全文
下载免费PDF全文 Wai Ming Cheung Joseph W. I. Lam Doreen W. H. Au Wendy W. Y. So Yanli Huang Hector W. H. Tsang 《Psychology in the schools》2017,54(9):889-904
Hong Kong attained the top place in the Progress in International Reading Literacy Study (PIRLS) 2011, an international study of reading achievement, which arouses keen interest in understanding the reasons behind this remarkable achievement. Although factors associated with reading achievement in English have been widely studied, similar studies using Chinese as a different language system are limited. The present study proposes and tests a hypothetical model that attempts to explain the variance of reading achievement of Hong Kong pupils in the PIRLS 2011 study, focusing on parental and student factors. Data of 3,875 fourth graders from 132 primary schools and their parents or caregivers (n = 3,682) are involved in the analysis. Structural equation modeling supports the hypothesized model as tenable explaining 34% of the variance of reading achievement. Parental background acts as the fundamental factor that exerts an indirect effect on reading motivation, reading self‐efficacy, and reading achievement of students via books at home and early reading abilities. Reading motivation and reading self‐efficacy are found to be significant in influencing reading achievement. Implications for educational practices and future research are discussed. 相似文献
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Anthony A. Wright Peter J. Urcuioli Stephen F. Sands Hector C. Santiago 《Learning & behavior》1981,9(4):595-603
Delayed matching-to-sample performance by pigeons was interfered with by displaying a monochromatic annulus around the center (sample) pecking key. The wavelength of the annulus and its point of interpolation within a trial were varied to determine possible differential effects on matching accuracy. Experiment 1 showed that delayed matching was most disrupted when the interference stimulus (570 nm, 630 nm, or achromatic white) appeared during the delay interval of a trial. Little if any disruption occurred when the interference stimulus was present during the sample and choice periods. The spectral relationship between the chromatic interference stimuli (570 and 630 nm) and the sample stimuli (570 and 630 nm) did not consistently influence the degree to which matching accuracy was affected in any interpolation condition. Experiment 2 found a similar pattern of within-trial effects when the interference stimulus was simply a change from a white achromatic annulus to a chromatic one. This finding indicates that illumination changes, such as the popular houselight variation, are not necessary to produce interference in delayed matching to sample. Even with illumination held constant, however, performance was not differentially sensitive to the similarity between interference and sample stimulus wavelengths. It is suggested that other experiments showing similarity effects in interference of delayed matching to sample were conducted in such a way that subjects confused the interfering stimuli with the samples. 相似文献
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Hector R. Ponce Richard E. Mayer Mario J. Lopez 《Educational technology research and development : ETR & D》2013,61(5):819-840
This article explores the effectiveness of a computer-based spatial learning strategy approach for improving reading comprehension and writing. In reading comprehension, students received scaffolded practice in translating passages into graphic organizers. In writing, students received scaffolded practice in planning to write by filling in graphic organizers and in translating them into passages. Based on a cluster-randomized sampling process, 2,468 students distributed in 12 schools and 69 classrooms participated in the study. Schools were randomly assigned to the computer-based instruction (CBI) group or traditional instruction (TI) group. Teachers assigned to the CBI treatment integrated the applications into the language arts curriculum during one school semester. A standardized test was used to measure reading comprehension and writing. The data were analyzed through a statistical multilevel model. The findings showed that students in the CBI group improved their reading and writing skills significantly more than students under TI—yielding an effect size d = 0.30. 相似文献