Teo T.,Singapore National Institute of Education
Internet and Higher Education | Year: 2010
This research involves the development and validation of a survey that measures users' acceptance of e-learning. A total sample of 386 university students from a teacher training institute in an Asian country participated in this study. Comprising two studies, the first study (n = 197) initiated a generic questionnaire, and examined factorial validity and reliability. The second study (n = 189) used confirmatory factor analysis to establish factorial validity and measurement invariance by gender using a different sample. A correlated three-factor model (Tutor Quality, Perceived Usefulness, and Facilitating Conditions) was fit using maximum likelihood estimation (MLE) and found to be adequate. For the two samples, the E-learning Acceptance Measure (ElAM) was found to be a precise and internally consistent measure. Applications of the ElAM were discussed. © 2010 Elsevier Inc. All rights reserved.
Fulmer G.W.,Singapore National Institute of Education
Journal of Science Education and Technology | Year: 2014
Attitudes toward science are an important aspect of students' persistence in school science and interest in pursuing future science careers, but students' attitudes typically decline over the course of formal schooling. This study examines relationships of students' attitudes toward science with their perceptions of science as inclusive or non-religious, and their epistemological beliefs about epistemic authority and certainty. Data were collected using an online survey system among undergraduates at a large, public US university (n = 582). Data were prepared using a Rasch rating scale model and then analyzed using multiple-regression analysis. Gender and number of science and mathematics courses were included as control variables, followed by perceptions of science, then epistemological beliefs. Findings show that respondents have more positive attitudes when they perceive science to be inclusive of women and minorities, and when they perceive science to be incompatible with religion. Respondents also have more positive attitudes toward science when they believe scientific knowledge is uncertain, and when they believe knowledge derives from authority. Interpretations of these findings and implications for future research are discussed. © 2013 Springer Science+Business Media New York.
Lee J.,Singapore National Institute of Education
Assessment | Year: 2014
This article reviews cognitive interviewing (CI) as a survey pretesting method in cross-national settings. Particularly, semi-structured cognitive interviewing (SSCI) using direct probing is advocated when CI involves multiple countries/languages. Four major groups of fundamental issues are discussed: conceptual, measurement, procedural, and practical. The conceptual issues relate to the nature of interview data, potential sources of problems, and sample size. Next, it is shown how the SSCI method can be used to informally evaluate validity, reliability, and cross-cultural equivalence. This is followed by the procedural steps and the practical issues in implementing cross-national SSCI studies. Some methodological and practical limitations are also noted. The article concludes by highlighting the implications of using the cross-national CI method in a single-country context with multiple immigrant/cultural/language groups or in monocultural settings. © The Author(s) 2012.
Kim Y.,Singapore National Institute of Education
Journal of Pragmatics | Year: 2012
This article contributes to the recently arising CA-for-SLA (Conversation Analysis for Second Language Acquisition) inquiry by demonstrating how an understanding of interactional practices may inform our understanding of language learning. The target interactional practice examined in this article is a set of referential practices, particularly for establishing initial recognitional reference of a third person or object when the name or a relevant lexical item for the target referent is not available to the speaker. Based on close examination of sequential organization of a set of practices for achieving mutually understood reference in casual conversations between L1 and L2 English speakers, the study shows how structural opportunities for language learning are generated in interaction, which serves to broaden our understanding of the relationship between certain interactional practices and learning opportunities afforded in such practices. The issue of participants' orientation to such sequential environments as learning opportunities is also discussed. © 2012 Elsevier B.V.
Tan L.T.,Singapore National Institute of Education
Biofouling | Year: 2010
Filamentous benthic marine cyanobacteria are a prolific source of structurally unique bioactive secondary metabolites. A total of 12 secondary metabolites, belonging to the mixed polyketide-polypeptide structural class, were isolated from the marine cyanobacterium, Lyngbya majuscula, and were tested to determine if they showed activity against barnacle larval settlement. The assays revealed four compounds, dolastatin 16, hantupeptin C, majusculamide A, and isomalyngamide A, that showed moderate to potent anti-larval settlement activities, with EC(50) values ranging from 0.003 to 10.6 microg ml(-1). In addition, field testing conducted over a period of 28 days (using the modified Phytagel method) based on the cyanobacterial compound, dolastatin 16, showed significantly reduced barnacle settlement as compared to controls at all the concentrations tested. The results of this study highlight the importance of marine cyanobacteria as an underexplored source of potential environmentally friendly antifoulants.