The impact of conflicting goals on mathematical teaching decisions

This paper describes part of an international project considering graphical construction of antiderivative functions in the secondary mathematics classroom. We use Schoenfeld’s resources, orientations, and goals (ROGs) framework to analyse the decisions made by a teacher, Adam, during a lesson on graphical antiderivatives. We present details of Adam’s ROG and see how this is related to resolution of the conflict between his competing goals and the decisions he makes. The results suggest that a beneficial professional development strategy might be to assist teachers to become more aware of their ROG and its influence on in-the-moment classroom decisions.     

The Public role of school teachers in Korea: For its conceptual reconstruction through its historical tracing

Abstract

This paper makes a bold attempt to make sense of contemporary Koreans’ common expectation of the educational role of public school teachers by tracing its historical and cultural roots to the neo-Confucian humanistic tradition of the Joseon dynasty in Korea that lasted for about 500 years until Korea began to modernize in the late nineteenth century. In this attempt, the key concepts to be explored as equivalent to the Western idea of ‘liberal learning’ are the Confucian ethics of ‘learning for oneself’ and its relation to schooling and teaching. The discussion focuses on whether and how this ethics of learning can be recovered in such a way as to accommodate the postmodern condition of our society, as the educational legacy of the humanistic tradition of East Asia that can keep the public spirit alive in (post-) modern schooling.     

The Contribution of HBCUS to the Preparation of African American Women for Stem Careers: A Case Study

This study uses case study analysis to explore the ways that Spelman College, a historically Black women’s college, promotes the attainment of African American women in STEM fields. Although limited to one institution, the findings shed light on the ways that institutional characteristics, policies, and practices may mitigate the barriers that limit attainment of African American women in STEM fields. Drawing on the findings, the paper concludes with recommendations for improving policy and practice as well as recommendations for additional fruitful research.     

THE MULTI─ASSOCIATION MODEL OF THE ESR─ACIDITY SENSITIVE FREE RADICAL：A THEORETICAL STUDY

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Comparisons of Three Empirical Methods for Partial Factorial Invariance: Forward,Backward, and Factor-Ratio Tests

When factorial invariance is violated, a possible first step in locating the source of violation(s) might be to pursue partial factorial invariance (PFI). Two commonly used methods for PFI are sequential use of the modification index (backward MI method) and the factor-ratio test. In this study, we propose a simple forward method using the confidence interval (forward CI method). We compare the performances of the aforementioned 3 methods under various simulated PFI conditions. Results indicate that the forward CI method using 99% CIs has the highest perfect recovery rates and the lowest Type I error rates. A performance that is competitive with this is that produced by the backward method with the more conservative criterion (MI = 6.635). Consistently delivering the poorest performance, regardless of the chosen confidence level, was the factor-ratio test. Also discussed are the work’s contribution, implications, and limitations.     

韩国消费者对中国冰箱选择的研究

本研究以首尔(Seoul)的MBA学生为对象,实证分析了中国的国家形象、中国冰箱的功能属性和品牌个性对于韩国消费者的中国冰箱选择具有什么影响。结果表明,韩国消费者考虑购买中国冰箱时,除了国家形象、功能属性以外还受到品牌个性因素的影响。本研究指出了进入韩国的中国企业应开发与国家形象有关的、有个性的品牌产品,即品牌个性会提高品牌知名度,增加企业信赖度,从而成为韩国市场上更受欢迎的品牌,也将为有效的品牌市场导向提供产品差别化,这样可以使中国企业在竞争中获得优势。     

Low-cost,disposable microfluidics device for blood plasma extraction using continuously alternating paramagnetic and diamagnetic capture modes

Blood plasma contains biomarkers and substances that indicate the physiological state of an organism, and it can be used to diagnose various diseases or body condition. To improve the accuracy of diagnostic test, it is required to obtain the high purity of blood plasma. This paper presents a low-cost, disposable microfluidics device for blood plasma extraction using magnetophoretic behaviors of blood cells. This device uses alternating magnetophoretic capture modes to trap and separate paramagnetic and diamagnetic cells away from blood plasma. The device system is composed of two parts, a disposable microfluidics chip and a non-disposable (reusable) magnetic field source. Such modularized device helps the structure of the disposable part dramatically simplified, which is beneficial for low-cost mass production. A series of numerical simulation and parametric study have been performed to describe the mechanism of blood cell separation in the microchannel, and the results are discussed. Furthermore, experimental feasibility test has been carried out in order to demonstrate the blood plasma extraction process of the proposed device. In this experiment, pure blood plasma has been successfully extracted with yield of 21.933% from 75 μl 1:10 dilution of deoxygenated blood.     

Infusing Culturally Responsive Science Curriculum into Early Childhood Teacher Preparation

Research in Science Education - Previous research studies in early childhood teacher education have indicated that teacher candidates are not adequately prepared to demonstrate the knowledge and...     

Specification Search for Identifying the Correct Mean Trajectory in Polynomial Latent Growth Models

This study investigated the optimal strategy for model specification search under the latent growth modeling (LGM) framework, specifically on searching for the correct polynomial mean or average growth model when there is no a priori hypothesized model in the absence of theory. In this simulation study, the effectiveness of different starting models on the search of the true mean growth model was investigated in terms of the mean and within-subject variance-covariance (V-C) structure model. The results showed that specifying the most complex (i.e., unstructured) within-subject V-C structure with the use of LRT, ΔAIC, and ΔBIC achieved the highest recovery rate (>85%) of the true mean trajectory. Implications of the findings and limitations are discussed.