The cementation of coarse dust to indoor surfaces     

Peter Brimblecombe  David Thickett  Young Hun Yoon   《Journal of Cultural Heritage》2009,10(3):410-414

Dust accumulation is an important management and conservation problem in historic houses. Laboratory and field observations show that high relative humidity enhances the cementation of particles to underlying surfaces. The hygroscopic nature of particles or the fibres to which they adhere influences this cementation process. The cements, which can form in a matter of hours at high humidity, appear to be microcrystalline calcites. Reducing the impact of this process on heritage objects requires preventing dust deposits, especially in periods of high humidity.  相似文献   

Sources of information on adverse effects: a systematic review     

Su Golder  Yoon K. Loke 《Health information and libraries journal》2010,27(3):176-190

Background: Systematic reviews can provide accurate and timely information on adverse effects. An essential part of the systematic review process is a thorough search of the literature. This often requires searching many different sources. However, it is unclear which sources are most effective at providing information on adverse effects. Objective: To identify and summarise studies that have evaluated sources of information on adverse effects. Methods: Studies were located by searching in 10 databases as well as by reference checking, hand searching, citation searching and contacting experts. Results: A total of 6218 citations were retrieved yielding 19 studies which met the inclusion criteria. The included studies tended to focus on the adverse effects of drug interventions and compare the relative value of different sources using the number of relevant references retrieved from searches of each source. However, few studies were conducted recently with a large sample of references. Conclusions: This review suggests that embase , Derwent Drug File, medline and industry submissions may potentially provide the greatest number of relevant references for information on adverse effects of drugs. However, a systematic evaluation of the current value of different sources of information for adverse effects is urgently required.  相似文献   

Conceptualizing Communication Capital for a Changing Environment     

Leo Wayne Jeffres  Guowei Jian  Sukki Yoon 《Communication quarterly》2013,61(5):539-563

  相似文献   

Refining the Measure and Dimensions of Social Values of Older People (SVOP)     

Eunkyung Yoon  Stacey R. Kolomer 《Educational gerontology》2013,39(8):649-663

The research reported in this study concerns older adults from Australia who voluntarily chose to learn the craft of woodturning. The paper examines the literature of adult learning under the themes of presage factors, the learning environment, instructional methods, and techniques for facilitators. The paper then reports on the analysis of two sections of a questionnaire completed by 123 respondents: the first on motivation to learn and the second on learning strategies. The older learners reported using both intrinsic and extrinsic motivation, with intrinsic motivation constructed of both general and specific elements. There were four main learning strategies used: actively seeking knowledge, independent learning, dependent learning, and passively seeking knowledge.  相似文献   

Own Group Oppression, Other Group Oppression, and Perspective Taking     

Eunju Yoon  Jennifer Moulton  Gihane Jeremie-Brink  Meghan Hansen 《International journal for the advancement of counseling》2013,35(3):203-215

This survey research examined the relationship of awareness of own versus awareness of other group oppression across sexism, racism, and homonegativity, by including perspective taking (PT) as a moderator. Hierarchical multiple regression analyses indicated that awareness of sexism (own group oppression) predicted awareness of racism (other group oppression) in a sample of 116 European American females (Study 1), whereas awareness of racism (own group oppression) did not predict awareness of homonegativity (other group oppression) in a sample of 113 U.S. racial minorities (Study 2). High PT, compared to low PT, did not predict a stronger relationship between awareness of own and awareness of other group oppression. Post-hoc speculation on the role of PT in intergroup relations and implications for research and counseling are discussed.  相似文献   

Using an adaptive expertise lens to understand the quality of teachers’ classroom implementation of computer-supported complex systems curricula in high school science     

Susan A. Yoon  Jessica Koehler-Yom  Emma Anderson  Joyce Lin  Eric Klopfer 《Research in Science & Technological Education》2013,31(2):237-251

Background: This exploratory study is part of a larger-scale research project aimed at building theoretical and practical knowledge of complex systems in students and teachers with the goal of improving high school biology learning through professional development and a classroom intervention.

Purpose: We propose a model of adaptive expertise to better understand teachers’ classroom practices as they attempt to navigate myriad variables in the implementation of biology units that include working with computer simulations, and learning about and teaching through complex systems ideas.

Sample: Research participants were three high school biology teachers, two females and one male, ranging in teaching experience from six to 16 years. Their teaching contexts also ranged in student achievement from 14–47% advanced science proficiency.

Design and methods: We used a holistic multiple case study methodology and collected data during the 2011–2012 school year. Data sources include classroom observations, teacher and student surveys, and interviews. Data analyses and trustworthiness measures were conducted through qualitative mining of data sources and triangulation of findings.

Results: We illustrate the characteristics of adaptive expertise of more or less successful teaching and learning when implementing complex systems curricula. We also demonstrate differences between case study teachers in terms of particular variables associated with adaptive expertise.

Conclusions: This research contributes to scholarship on practices and professional development needed to better support teachers to teach through a complex systems pedagogical and curricular approach.  相似文献   

The incorporation of hands-on tasks in an online course: an analysis of a blended learning environment     

Thomas Chandler  Yoon Soo Park  Karen L. Levin  Stephen S. Morse 《Interactive Learning Environments》2013,21(5):456-468

This article describes the design and evaluation of a blended online/face-to-face course completed by more than 6000 learners throughout the United States of America and internationally. The educational impact was monitored using a variety of evaluation strategies. The results, in terms of achieved knowledge and overall satisfaction, indicate that a focus on online instruction combined with face-to-face, hands-on activities showed statistically significant improvement in the learners' understanding of the course material, while also validating the impact of the curriculum in their workplace. As illustrated through the blended course design, this study further showed that online learners with greater improvement in their pre- and posttest scores also exhibited significantly greater likelihood in demonstrating competency in several areas during the hands-on portion of the course. In particular, participants working in the information systems field exhibited the highest mean difference score (21.49) on the pre- and the posttests, while those working in the laboratory had the lowest (12.17). Likewise, the odds that participants who reviewed the course contents sought to further understand their job roles was 58.2 times greater for those in information systems, while it was only 19.0 times greater for laboratory staff, than those who did not review their job roles.  相似文献   

Detecting Violations of Factorial Invariance Using Data-Based Specification Searches: A Monte Carlo Study     

Myeongsun Yoon  Roger E. Millsap 《Structural equation modeling》2013,20(3):435-463

In testing factorial invariance, researchers have often used a reference variable strategy in which the factor loading for a variable (i.e., reference variable) is fixed to 1 for identification. This commonly used method can be misleading if the chosen reference variable is actually a noninvariant item. This simulation study suggests an alternative method for testing factorial invariance and evaluates the performance of the method in specification searches based on the modification index. The results of the study showed that the proposed specification searches performed well when the number of noninvariant variables was relatively small and this performance improved as sample size increased and the size of group differences increased. When the number of noninvariant variables was relatively large, however, the method rarely succeeded in detecting the noninvariant items in the specification searches. Implications of the findings are discussed along with the limitations of the study.  相似文献   

A Cross-Cultural Comparison of the Effects of Source Credibility on Attitudes and Behavioral Intentions     

Kak Yoon  Choong Hyun Kim  Min-Sun Kim 《Mass Communication and Society》2013,16(3-4):153-173

In this article, we investigated (a) whether the commonly reported 3 dimensions of source credibility (expertise, trustworthiness, and attractiveness) are applicable to both Americans and Koreans, and (b) which of those 3 dimensions exerted more influence on the dependent variables in each country. Findings suggest that the dimensionality of source credibility was remarkably similar between the 2 samples. The influence of 3 source credibility dimensions varied by the dependent variables. Attractiveness, expertise, and trustworthiness were equally important to purchase intentions. All 3 dimensions affected involvement with the advertisement message equally. Only trustworthiness had a significant impact on attitude toward brand and brand beliefs. In terms of attitude toward the advertisement, perceived attractiveness of the endorser was more important than expertise and trustworthiness.  相似文献   

Re-presenting Sport: How Instant Replay and Perceived Violence Impact Enjoyment of Mediated Sports     

Leo Jeffres  Edward Horowitz  Cheryl C. Bracken  Guowei Jian  Kimberly A. Neuendorf  Sukki Yoon 《Mass Communication and Society》2013,16(6):787-815

Several long-standing theories intersect in discussing the impact of community characteristics and of the mass media. The structural pluralism model popularized by Tichenor and his colleagues says that social structure influences how mass media operate in communities because they respond to how power is distributed in the social system, whereas the linear model says that the increasing size of a community's population leads to more social differentiation and diversity and corresponding increases in subcultures with their own beliefs, customs, and behaviors. Recently, there has been a concern about how changes in society have led to a decline in organizational activity and the network of relationships and trust that constitute “social capital.” This article examines the impact of population and diversity (using census data) on individuals’ media use, interpersonal discussion and civic engagement (measured in a national survey), and the relationship among these variables. Analysis of a structural model provides evidence that the “linear hypothesis” can be combined with structural pluralism, with size—measured by population—impacting diversity, which influences the relationships that people have with their community. Concurrently, social categories influence people's communication patterns and community relationships, and communication impacts civic engagement.  相似文献