Multiple perceptions of children's aggression: Differences across neighborhood,age, gender,and perceiver     

Cynthia Hudley  William D. Wakefield  Brenda Britsch  Su‐Je Cho  Tara Smith  Marlene Demorat 《Psychology in the schools》2001,38(1):43-56

We investigated how overtly aggressive behavior was differentially perceived by two types of perceivers, teachers and peers, as a function of student neighborhood, gender, and grade level. Participants (N= 765) were predominantly African American students in grades 3‐5 recruited from two urban public schools in southern California. The neighborhoods surrounding the two schools differed in levels of identified violent crime and economic levels. Teachers in the community experiencing more violence perceived student behavior to be relatively less aggressive and more similar across genders than did teachers in the less violent community. Peers in the community experiencing more violent crime perceived both boys and girls to be somewhat aggressive, whereas in the less violent community, boys were perceived as aggressive more so than were girls. In general, agreement between teacher and peer perceptions was stronger for boys than for girls. © 2001 John Wiley & Sons, Inc.  相似文献   

Mixing enhancement in microfluidic channel with a constriction under periodic electro-osmotic flow     

Chun Yee Lim  Yee Cheong Lam    Chun Yang 《Biomicrofluidics》2010,4(1)

We present a new approach to enhance mixing in T-type micromixers by introducing a constriction in the microchannel under periodic electro-osmotic flow. Two sinusoidal ac electric fields with 180° phase difference and similar dc bias are applied at the two inlets. The out of phase ac electric field induces oscillation of fluid interface at the junction of the two inlet channels and the constriction. Due to the constriction introduced at the junction, fluids from these two inlets form alternative plugs at the constricted channel. These plugs of fluids radiate downstream from the constriction into the large channel and form alternate thin crescent-shaped layers of fluids. These crescent-shaped layers of fluids increase tremendously the contact surface area between the two streams of fluid and thus enhance significantly the mixing efficiency. Experimental results and mixing mechanism analysis show that amplitude and frequency of the ac electric field and the length of the constriction govern the mixing efficiency.  相似文献   

Release monitoring of single cells on a microfluidic device coupled with fluorescence microscopy and electrochemistry     

Shi BX  Wang Y  Lam TL  Huang WH  Zhang K  Leung YC  Chan HL 《Biomicrofluidics》2010,4(4):43009

A method for monitoring the biological exocytotic phenomena on a microfluidic system was proposed. A microfluidic device coupled with functionalities of fluorescence imaging and amperometric detection has been developed to enable the real-time monitoring of the exocytotic events. Exocytotic release of single SH-SY5Y neuroblastoma cells was studied. By staining the cells located on integrated microelectrodes with naphthalene-2,3-dicarboxaldehyde, punctuate fluorescence consistent with localization of neurotransmitters stored in vesicles was obtained. The stimulated exocytotic release was successfully observed at the surface of SH-SY5Y cells without refitting the commercial inverted fluorescence microscope. Spatially and temporally resolved exocytotic events from single cells on a microfluidic device were visualized in real time using fluorescence microscopy and were amperometrically recorded by the electrochemical system simultaneously. This coupled technique is simple and is hoped to provide new insights into the mechanisms responsible for the kinetics of exocytosis.  相似文献   

Problem-based learning and the development of metacognition   总被引：1，自引：0，他引：1  

Kevin Downing  Theresa Kwong  Sui-Wah Chan  Tsz-Fung Lam  Woo-Kyung Downing 《Higher Education》2009,57(5):609-621

This study samples first year undergraduates from two programmes at a Hong Kong University (N = 66). One programme uses an entirely problem-based approach to learning and teaching, whilst the other uses more traditional methods. Using the Learning and Study Strategies Inventory (LASSI) as a measure of student perceptions of their thinking, or metacognition it explores differences in metacognitive development between each group of students between the beginning and end of their first year in each programme. The paper argues that, in addition to the formal learning context, everyday challenges emerging from the additional new social contexts provided by problem-based curricula provide fertile environments for the development of metacognition because whilst the highest ‘meta-level’ of cognition is usually not implicated when we receive an outside task and when the task solution is known, the meta-level does tend to be consulted when things go wrong or when the situation is new. In other words, when we are faced with finding solutions to a problem whether posed by the teacher as part of a problem-based curriculum or a new social environment, we are more likely to develop generic, as well as subject specific skills.  相似文献   

Correction to: “Development of the human interaction dimension of Self‐Regulated Learning Questionnaire in asynchronous online learning environments”     

Moon‐Heum Cho  David Jonassen 《教育心理学》2009,29(2)

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Referral,enrollment, and completion in developmental education sequences in community colleges   总被引：5，自引：0，他引：5  

Thomas Bailey  Dong Wook JeongSung-Woo Cho 《Economics of Education Review》2010

After being assessed, many students entering community colleges are referred to one or more levels of developmental education. While the need to assist students with weak academic skills is well known, little research has examined student progression through multiple levels of developmental education and into entry-level college courses. The purpose of this paper is to analyze the patterns and determinants of student progression through sequences of developmental education starting from initial referral. Our results indicate that fewer than one half of the students who are referred to remediation actually complete the entire sequence to which they are referred. About 30 percent of students referred to developmental education do not enroll in any remedial course, and only about 60 percent of referred students actually enroll in the remedial course to which they were referred. The results also show that more students exit their developmental sequences because they did not enroll in the first or a subsequent course than because they failed or withdrew from a course in which they were enrolled. We also show that men, older students, African American students, part-time students, and students in vocational programs are less likely to progress through their full remedial sequences.  相似文献   

Early gender test score gaps across OECD countries     

Kelly Bedard  Insook Cho 《Economics of Education Review》2010

The results reported in this paper contribute to the debate about gender skill gaps in at least three ways. First, we document the large differences in early gender gaps across developed countries using a large scale, modern, representative data source. Second, we show that countries with pro-female sorting, countries that place girls in classes with higher than average scores have smaller gender test score gaps, at least in math. Third, we show that the degree of academic tracking is correlated with observed gender gaps across developed countries.  相似文献   

Issues of cultural appropriateness and pedagogical efficacy: exploring peer review in a second language writing class     

Guangwei Hu  Sandra Tsui Eu Lam 《Instructional Science》2010,38(4):371-394

This paper reports on a study designed to investigate (a) whether peer review is an effective pedagogical activity with adult Chinese students in the teaching of second language (L2) academic writing and (b) how factors such as perceptions of the influence of peer reviewers’ L2 proficiency, previous experience with peer review, feedback preferences, and culturally-based beliefs and practices relate to the effectiveness of the pedagogical activity. Participants were 20 English-as-an-L2 learners from China who were enrolled in an academic writing class for postgraduate students at a Singaporean university. Data included first drafts of an academic writing assignment, written peer comments, revised drafts of the assignment, responses to a questionnaire, and interviews. Quantitative analyses of the peer comments and revisions to the drafts show that significant improvement in the revised drafts was linked to peer feedback. Further statistical analyses indicate that the learner variables of interest did not affect the effectiveness of the peer review activity. In addition, qualitative analyses of the questionnaire data and the interviews reveal a general acceptance of peer review as a socioculturally appropriate pedagogical activity for Chinese students. The results of the study are interpreted with an understanding of its limitations, and directions for further research are also discussed.  相似文献   

Leaning towards China: Taiwanese Basketball Talent Migration to the PRC     

Wan-Ching Cho  Chih-Fu Cheng  Alan Bairner 《国际体育史杂志》2018,35(12-13):1390-1406

Abstract

This study aims to examine the different influences on Taiwanese basketball migration from 1999 to the present particularly in relation to the specific political relationship between Taiwan and China. Political influence on sports talent migration is well recognized, but has yet to be fully explored. This study contributes to our understanding of sport migration by providing in-depth empirical and analytical insights into the role of political influences, thereby adding to an understanding of the institutional factors that can either impede or facilitate sport labour migration and of the key networks involved in specific migratory processes.  相似文献   

A Preliminary Analysis of the Factors Affecting Satisfaction with the Police Practicum Credit Program in South Korea     

Joon Tag Cho  Hyeonho Park 《Journal of Criminal Justice Education》2018,29(1):137-156

Numerous studies have been conducted about criminal justice internship programs in western countries, but few have addressed similar types of programs conducted in Eastern countries. To fill this gap in the literature, this study preliminarily analyzed the factors affecting satisfaction with the police practicum credit program in South Korea using data collected from 208 participating students and police officers. The results showed that participants were generally satisfied with the program but had different perceptions about each program component. Focusing on the crucial elements affecting overall satisfaction with the program, the study examined the following factors: the curriculum; the period and practice time; the proportion of on-site practice; teaching material; credits; and police officers’ preparedness, attitudes and information offerings. Our results suggest that the curriculum and preparedness of the officers in charge were significant factors affecting the participants’ satisfaction. Based on the findings, implications for policy recommendations are discussed.  相似文献