Exploring the Roles and Nature of Science: A case study of severe acute respiratory syndrome     

Yeung Chung Lee 《International Journal of Science Education》2013,35(4):515-541

The roles of science in society and the nature of science are the focus of many science curricula. Current views about these two aspects of science have largely been informed by the history of scientific development. This article uses the outbreak of severe acute respiratory syndrome—a recent health scare—as a case study to explore the roles of science and their relationship with the nature of science and societal factors. The review provides deeper insight into the difficulties that are encountered in fulfilling these roles, particularly those that relate to the nature of science. This review has implications for both school and public science education.  相似文献   

Examination of the Psychometric Properties of the Chinese Translated Behavioral Regulation in Exercise Questionnaire-2     

Pak Kwong Chung  Jing Dong Liu 《Measurement in physical education and exercise science》2013,17(4):300-315

The present study was designed to examine the psychometric properties of the Chinese-translated Behavioral Regulation in Exercise Questionnaire-2 (Markland & Tobin, 2004 Markland, D. and Tobin, V. J. 2004. A modification of the Behavioural Regulation in Exercise Questionnaire to include an assessment of amotivation. Journal of Sport and Exercise Psychology, 26: 191–196. [Crossref], [Web of Science ®] , [Google Scholar]). A sample of Chinese university students (N?=?555) was invited to take part in this study. Confirmatory factor analysis was employed to examine the factorial validity, and the results supported the 5-factor structure of the Chinese-translated Behavioral Regulation in Exercise Questionnaire-2. Examination of the 95% confidence interval of the inter-factor correlations suggested that the Chinese-translated Behavioral Regulation in Exercise Questionnaire-2 assesses related but distinct constructs, which provided support for the discriminant validity. Composite reliability values of subscales were all over .75, which suggested that internal consistency reliability of Chinese-translated Behavioral Regulation in Exercise Questionnaire-2 was acceptable. Examination of the pattern of inter-factor correlations between different regulations suggested that the simplex-like pattern was displayed, which provided evidence for the nomological validity of Chinese-translated Behavioral Regulation in Exercise Questionnaire-2. Examination of the correlations of different regulations with affective and behavioral outcomes provided further support for the nomological validity. Multi-group confirmatory factor analysis was conducted to examine the gender invariance of Chinese-translated Behavioral Regulation in Exercise Questionnaire-2, and the results suggested that the factor loadings and factor variances and covariances of the Chinese-translated Behavioral Regulation in Exercise Questionnaire-2 measurement model to be invariant across male and female participants. Overall, the study provided initial psychometric evidence for the Chinese-translated Behavioral Regulation in Exercise Questionnaire-2.  相似文献   

The effect of site quality on repurchase intention in Internet shopping through mediating variables: The case of university students in South Korea     

Jae Ik Shin  Ki Han Chung  Jae Sin Oh  Chang Won Lee 《International Journal of Information Management》2013

We performed a study to determine the influence that site quality has on repurchase intention of Internet shopping through customer satisfaction, customer trust, and customer commitment. Appropriate measures were developed and tested on 230 university students of Gyeongnam province in South Korea with a cross-sectional questionnaire survey. The results of the empirical analysis confirmed that site quality can be conceptualized as a composite of six dimensions of shopping convenience, site design, information usefulness, transaction security, payment system, and customer communication. Second, site quality positively affected customer satisfaction and customer trust, but did not affect customer commitment and repurchase intention. Third, site quality can affect repurchase intention by enhancing or attenuating customer satisfaction, customer trust, and customer commitment in online transaction situation. The mediating effect of customer satisfaction, customer trust, and customer commitment between site quality and repurchase intention is identified. Fourth, site quality indirectly affected customer commitment through customer satisfaction. Customer satisfaction indirectly affected repurchase intention through customer trust and customer commitment. Thus, it is found that site quality can be a very important factor to enhance repurchase intention in the customer perspective.  相似文献   

A polystyrene-based microfluidic device with three-dimensional interconnected microporous walls for perfusion cell culture     

Chung Yu Chan  Vasiliy N. Goral  Michael E. DeRosa  Tony Jun Huang  Po Ki Yuen 《Biomicrofluidics》2014,8(4)

In this article, we present a simple, rapid prototyped polystyrene-based microfluidic device with three-dimensional (3D) interconnected microporous walls for long term perfusion cell culture. Patterned 3D interconnected microporous structures were created by a chemical treatment together with a protective mask and the native hydrophobic nature of the microporous structures were selectively made hydrophilic using oxygen plasma treatment together with a protective mask. Using this polystyrene-based cell culture microfluidic device, we successfully demonstrated the support of four days perfusion cell culture of hepatocytes (C3A cells).  相似文献   

A framework of cloud-based virtual phones for secure intelligent information management     

Jiun-Hung Ding  Roger Chien  Shih-Hao Hung  Yi-Lan Lin  Che-Yang Kuo  Ching-Hsien Hsu  Yeh-Ching Chung 《International Journal of Information Management》2014

As mobile networks and devices being rapidly innovated, many new Internet services and applications have been deployed. However, the current implementation faces security, management, and performance issues, which are critical to the use in business environments. Migrating sensitive information, management facilities, and intensive computation to security hardened virtualized environment in the cloud provides effective solutions. This paper proposes an innovative Internet service and business model to provide a secure and consolidated environment for enterprise mobile information management based on the infrastructure of cloud-based virtual phones (CVP). Our proposed solution enables the users to execute Android and web applications in the cloud and connect to other users of CVP with enhanced performance and protected privacy. The organization of CVP can be mixed with centralized control and distributed protocols, which emulates the behavior of human societies. This minimizes the need to handle sensitive data in mobile devices, eases the management of data, and reduces the overhead of mobile application deployment.  相似文献   

Design of mixed H₂-dissipative observers with stochastic resilience for discrete-time nonlinear systems     

Chung Seop Jeong  Yvonne I. Yaz 《Journal of The Franklin Institute》2011,348(4):790-809

A linear matrix inequality based mixed H₂-dissipative type state observer design approach is presented for smooth discrete time nonlinear systems with finite energy disturbances. This observer is designed to maintain H₂ type estimation error performance together with either H_∞ or a passivity type disturbance reduction performance in case of randomly varying perturbations in its gain. A linear matrix inequality is used at each time instant to find the time-varying gain of the observer. Simulation studies are included to explore the performance in comparison to the extended Kalman filter and a previously proposed constant gain observer counterpart.  相似文献   

Item Response Models for Local Dependence Among Multiple Ratings     

Wen‐Chung Wang  Chi‐Ming Su  Xue‐Lan Qiu 《Journal of Educational Measurement》2014,51(3):260-280

Ratings given to the same item response may have a stronger correlation than those given to different item responses, especially when raters interact with one another before giving ratings. The rater bundle model was developed to account for such local dependence by forming multiple ratings given to an item response as a bundle and assigning fixed‐effect parameters to describe response patterns in the bundle. Unfortunately, this model becomes difficult to manage when a polytomous item is graded by more than two raters. In this study, by adding random‐effect parameters to the facets model, we propose a class of generalized rater models to account for the local dependence among multiple ratings and intrarater variation in severity. A series of simulations was conducted with the freeware WinBUGS to evaluate parameter recovery of the new models and consequences of ignoring the local dependence or intrarater variation in severity. The results revealed a good parameter recovery when the data‐generating models were fit, and a poor estimation of parameters and test reliability when the local dependence or intrarater variation in severity was ignored. An empirical example is provided.  相似文献   

The Random‐Effect DINA Model     

Hung‐Yu Huang  Wen‐Chung Wang 《Journal of Educational Measurement》2014,51(1):75-97

The DINA (deterministic input, noisy, and gate) model has been widely used in cognitive diagnosis tests and in the process of test development. The outcomes known as slip and guess are included in the DINA model function representing the responses to the items. This study aimed to extend the DINA model by using the random‐effect approach to allow examinees to have different probabilities of slipping and guessing. Two extensions of the DINA model were developed and tested to represent the random components of slipping and guessing. The first model assumed that a random variable can be incorporated in the slipping parameters to allow examinees to have different levels of caution. The second model assumed that the examinees’ ability may increase the probability of a correct response if they have not mastered all of the required attributes of an item. The results of a series of simulations based on Markov chain Monte Carlo methods showed that the model parameters and attribute‐mastery profiles can be recovered relatively accurately from the generating models and that neglect of the random effects produces biases in parameter estimation. Finally, a fraction subtraction test was used as an empirical example to demonstrate the application of the new models.  相似文献   

New products     

Hyunji Chung  Jungheum Park  Sangjin Lee 《TechTrends》2003,47(5):48-49

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The Paradox of Aims in Chinese Art and Design Education: Speculation on Co-operation in Hong Kong,Post 1997     

Rob Fielding  Siu King Chung 《The International Journal of Art & Design Education》1998,17(3):315-322

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