Energy Performance and Condensation Risk of DCDV System in Subtropical Hong Kong简

The combined use of dry cooling （DC） system and dedicated ventilation （DV） system to decouple cool-ing and dehumidification process for energy efficiency was proposed for subtropical climates like Hong Kong. In this study, the energy performance and condensation risk of the use of DCDV system were examined by analyzing its ap-plication in a typical office building in Hong Kong. Through hour-by-hour simulation using actual equipment per-formance data and realistic building and system characteristics, it was found that with the use of DCDV system, the annual energy consumption could be reduced by 54%in comparison with the conventional system （constant air vol-ume with reheat system）. In respect of condensation risk, it was found that the annual frequency of occurrence of con-densation on DC coil was 35 h. Additional simulations were conducted to examine the influence of different parame-ters on the condensation risk of DCDV system. Measures to ensure condensate-free on DC coil were also discussed.     

《终身教育法》修正后韩国终身教育振兴政策的动向及特征

近10年来,从终身教育的立法到各项政策的推广实施,韩国终身教育领域出现了前所未有的变化。2007年修正的韩国《终身教育法》的公布不仅明确了终身教育的范围,而且也使中央与地方的职责与权限更加明确,并通过重组力图建构更加完善且有效率的终身教育行政与财政支援体制。为了振兴终身教育,韩国大力开展了相应的支援计划：终身学习城市支援计划;终身学习账户制度;终身学习中心大学培育计划;终身教育专业人员的培养及其能力提升计划等。呈现的特点：一是国家相关政策的制定与引导是推进终身教育的根本动力．足够的经费和人力资源支撑是必要条件。二是注重整合各类教育资源,特别是在建立多样的终身教育机构和设施等平台的同时,也注重发挥学校教育的作用。三是实施面向全员并开展全程的终身教育,特别注重增加弱势群体的教育机会。这次修正不仅促进了各自治团体终身教育基础设施的建设,提升了社区网络的发展水平,而且还建立了将学习成果运用于地方的循环体系,促进了国民对终身教育的理解及参与,推动了韩国社会的协调发展。     

Identifying the Content,Lesson Structure,and Data Use Within Pre-collegiate Data Science Curricula

Journal of Science Education and Technology - As data become more available and integrated into daily life, there has been growing interest in developing data science curricula for youth in...     

Revisioning Fairness as Social Justice in Early Childhood Education

Early Childhood Education Journal - Young children’s ideas of fairness have been studied in a range of laboratory settings with findings that children see fairness as equal distribution of...     

A methodological framework for instructional design model development: Critical dimensions and synthesized procedures

Instructional design (ID) models have been developed to promote understandings of ID reality and guide ID performance. As the number and diversity of ID practices grows, implicit doubts regarding the reliability, validity, and usefulness of ID models suggest the need for methodological guidance that would help to generate ID models that are relevant and appropriate to the ever-changing design challenges in our world. Because the construction of an ID model involves an intricate externalization of unique sets of design experiences as well as a logical synthesis of relevant research, the purpose of this study was to formulate a methodological framework for ID model development. Through the analysis of 20 selected studies, four critical dimensions and ten synthesized procedures for constructing ID models were formulated. The resulting framework is intended to provide a useful theoretical and practical contribution to the field of ID.     

IMPACT OF EXPLICIT PRESENTATION OF SLOPES IN THREE DIMENSIONS ON STUDENTS’ UNDERSTANDING OF DERIVATIVES IN MULTIVARIABLE CALCULUS

In two dimensions (2D), representations associated with slopes are seen in numerous forms before representations associated with derivatives are presented. These include the slope between two points and the constant slope of a linear function of a single variable. In almost all multivariable calculus textbooks, however, the first discussion of slopes in three dimensions (3D) is seen with the introduction of partial derivatives. The nature of the discussions indicates that authors seem to assume that students are able to naturally extend the concept of a 2D slope to 3D and correspondingly it is not necessary to explicitly present slopes in 3D. This article presents results comparing students that do not explicitly discuss slopes in 3D with students that explicitly discuss slopes in 3D as a precursor to discussing derivatives in 3D. The results indicate that students may, in fact, have significant difficulty extending the concept of a 2D slope to a 3D slope. And that the explicit presentation of slopes in 3D as a precursor to the presentation of derivatives in 3D may significantly improve student comprehension of topics of differentiation in multivariable calculus.

     

Do American and Korean education systems converge? Tracking school reform policies and outcomes in Korea and the USA

This study examines key school reform policies and outcomes of the USA and Korea over the past three decades from comparative perspectives. Since the two nations’ unique educational problems brought divergent educational reform paths—standardization versus differentiation, high-stakes testing versus individualized assessment, and centralization versus decentralization—the study tracks international policy benchmarking efforts and potential impact on educational convergence. The study employs mixed methods, including the content analysis of research and media documents and the trend analysis of TIMSS and PISA datasets. The results indicate that, despite significant changes in policy discourse, the gaps between Korea and the USA in student math achievement and school climates did not narrow. The policy lessons from these cases and the issues of international education benchmarking are discussed.     

Understanding the majority opinion formation process in online environments: An exploratory approach to Facebook

Majority opinions are often observed in the process of social interaction in online communities, but few studies have addressed this issue with empirical data. To identify an appropriate theoretical lens for explaining majority opinions in online environments, this study investigates the skewness statistic, which indicates how many “Likes” are skewed to major comments on a Facebook post; 3489 posts are gathered from the New York Times Facebook page for 100 days. Results show that time is not an influential factor for skewness increase, but the number of comments has a logarithmic relation to skewness increase. Regression models and Chow tests show that this relationship differs depending on topic contents, but majority opinions are significant in overall. These results suggest that the bandwagon effect due to social affordance can be a suitable mechanism for explaining majority opinion formation in an online environment and that majority opinions in online communities can be misperceived due to overestimation.