The research–teaching nexus among academics from 15 institutions in Beijing,Mainland China     

Li-fang Zhang  Jung-Cheol Shin 《Higher Education》2015,70(3):375-394

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Developing learning progression‐based teacher knowledge measures     

Hui Jin  HyoJeong Shin  Michele E Johnson  JinHo Kim  Charles W. Anderson 《科学教学研究杂志》2015,52(9):1269-1295

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DISTRIBUTIVE PARTITIONING OPERATION IN MATHEMATICAL SITUATIONS INVOLVING FRACTIONAL QUANTITIES     

Soo Jin Lee  Jaehong Shin 《International Journal of Science and Mathematics Education》2015,13(2):329-355

In the present study, we describe a participating student’s (Carol’s) distributive partitioning scheme and operations along with Steffe’s and his colleagues’ studies about children’s constructions of fraction knowledge as a particular model of mathematical learning. Analysis of Carol’s mathematical behaviors indicates that an operationally common mathematical behavior (distributive partitioning operation) was revealed in various mathematical problem situations such as fraction multiplication, fraction division, and multiplicative transformation between fractional quantities. It both provides a rationale for why becoming versed in one mathematical subject could facilitate working with another mathematical subject and also implies the necessity of describing and defining students’ mathematical behaviors from an operational view of knowledge, which might lead to building foundations of a substantial cognitive map for students’ mathematical development.  相似文献   

Changes in children’s anger,sadness, and persistence across blocked goals: Implications for self-regulation     

Lin Tan  Eunkyung Shin  Kenyon Page  Cynthia L. Smith 《Child development》2023,94(2):411-423

The current study took a person-centered approach to examine the heterogeneity of changes in children’s emotions and persistence during a goal-blocking task and examined how different profiles of emotions and persistence related to children’s self-regulation. Children’s anger, sadness, and persistence were rated in a goal-blocking task in toddlerhood (T1; N = 140, 72 boys, M_age = 2.67 years, 90.7% White) and preschool (T2). Children’s self-regulation, specifically sustained attention and engagement, was assessed at T1, T2, and early school-age (T3) from 2005 to 2012. Growth mixture modeling revealed two classes of children at T1 and three classes at T2 with different patterns of anger, sadness, and persistence. Children’s classification at T2, but not T1, significantly predicted their sustained attention and engagement both concurrently and longitudinally.  相似文献   

Programmed sample delivery on a pressurized paper     

Joong Ho Shin  Juhwan Park  Seung Hoon Kim  Je-Kyun Park 《Biomicrofluidics》2014,8(5)

This paper reports a method to control the fluid flow in paper-based microfluidic devices simply by pressing over the channel surface of paper, thereby decreasing the pore size and permeability of a non-woven polypropylene sheet. As a result, fluid resistance is increased in the pressed region and causes flow rate to decrease. We characterize the decrease of flow rate with respect to different amounts of pressure applied, and up to 740% decrease in flow velocity was achieved. In addition, we demonstrate flow rate control in a Y-shaped merging paper and sequential delivery of multiple color dyes in a three-branched paper. Furthermore, sequential delivery of multiple fluid samples is performed to demonstrate its application in multi-step colorimetric immunoassay, which shows a 4.3-fold signal increase via enhancement step.  相似文献   

Help-seeking tendencies during early adolescence: An examination of motivational correlates and consequences for achievement     

Allison M. Ryan  Huiyoung Shin 《Learning and Instruction》2011,21(2):247-256

The present study examined the motivational correlates and achievement consequences of students’ help-seeking tendencies during sixth grade (N = 217). Students’ grades were collected from school records at the beginning and end of the school year. Midway through the year students reported on their academic self-efficacy and social demonstration goals; teachers reported on students’ help-seeking tendencies. First quarter grades and academic self-efficacy were positively related to adaptive help seeking and negatively related to avoidant help seeking. In addition, a social demonstration-approach goal was negatively related to adaptive help seeking. Help-seeking tendencies predicted 3rd quarter grades, controlling for 1st quarter grades.  相似文献   

Bromo-oxidation reaction in enzyme-entrapped alginate hollow microfibers     

Asthana A  Lee KH  Shin SJ  Perumal J  Butler L  Lee SH  Kim DP 《Biomicrofluidics》2011,5(2):24117

In this article, the authors present the fabrication of an enzyme-entrapped alginate hollow fiber using a microfluidic device. Further use of enzyme-entrapped alginate hollow fibers as a biocatalytic microchemical reactor for chemical synthesis is also deliberated in this article. To ensure that there is no enzyme leaching from the fiber, fiber surfaces were coated with chitosan. To confine the mobility of reactants and products within the porous hollow fibers the entire fibers were embedded into a transparent polydimethylsiloxane (PDMS) matrix which also works as a support matrix. A vanadium-containing bromoperoxidase enzyme isolated from Corallina confusa was used as a model enzyme to demonstrate the use of these alginate hollow-fiber reactors in bromo-oxidation of phenol red to bromophenol blue at different dye flow rates. Stability of the entrapped enzyme at different temperatures and the effect of the chitosan coating on the reaction conversion were also studied. It was observed that molecules as big as 27 kDa can be retained in the matrix after coating with chitosan while molecules with molecular-weight of around 378 Da can still diffuse in and out of the matrix. The kinetic conversion rate in this microfluidic bioreactor was more than 41-fold faster when compared with the standard test-tube procedure.  相似文献   

User innovation and knowledge sourcing: The case of financial software     

Jongtae Shin  Hyun Shin  P.M. Rao 《The Journal of High Technology Management Research》2012,23(1):58-70

According to user innovation literature, users can create important innovations and the novel functionalities embedded in those user innovations often become the sources of subsequent innovations by both other users and manufacturers. However, manufacturers are often hesitant in commercializing an innovation created by a single user due to the uncertainty around the market demands. We propose that such hesitancy will decrease when an increasing number of other users source knowledge elements from the focal user innovation and reproduce the novel functionality. Once the focal user innovation is commercialized by manufacturers, other users can purchase the novel functionality from the market rather than reproducing it in house. We propose that users capable of drawing on innovation resources are more likely to maintain in-house reproduction of the focal user innovation than users low on innovation resources. By using the Vector Autoregressive (VAR) model and Impulse Response Function (IRF) analysis method, we analyze knowledge sourcing activities from financial software patents data, and the findings provide empirical supports for our propositions.  相似文献   

Distributed fusion receding horizon filtering for uncertain linear stochastic systems with time-delay sensors     

Il Young Song  Vladimir Shin  Moongu Jeon 《Journal of The Franklin Institute》2012,349(3):928-946

A new distributed fusion receding horizon filtering problem is investigated for uncertain linear stochastic systems with time-delay sensors. First, we construct a local receding horizon Kalman filter having time delays (LRHKFTDs) in both the system and measurement models. The key technique is the derivation of recursive error cross-covariance equations between LRHKFTDs in order to compute the optimal matrix fusion weights. It is the first time to present distributed fusion receding horizon filter for linear discrete-time systems with delayed sensors. It has a parallel structure that enables processing of multisensory time-delay measurements, so the calculation burden can be reduced and it is more reliable than the centralized version if some sensors turn faulty. Simulations for a multiple time-delays system show the effectiveness of the proposed filter in comparison with centralized receding horizon filter and non-receding versions.  相似文献   

Convergence and divergence: Policy making about the convergence of technology in Korea     

Dong-Hee Shin 《Government Information Quarterly》2010

In 2009, the South Korean government reformed its communications sector through legislation that addresses convergence services. This study traces the policy-making process of the convergence in terms of politics and regulation, and it also examines how the stakeholders' interests are aligned and coordinated in the policymaking process of convergence in Korea. Using actor-network theory, this study relates the socio-political construction of Korea's strategy for convergence reform. Key research questions include: (1) what social and political factors influence strategy formulation and (2) how do different interests stabilize ideologies in which actors formulate their strategies based on their interests. Despite the dynamic interactions, the actor-network around convergence has yet not been effectively stabilized, as the politics of convergence is complex and marked by paradoxical features. This study suggests new intellectual perspectives and methodological heuristics that may assist researchers and practitioners analytical efforts in examining socio-technical change and the implications for policy development and implementation.  相似文献