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

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.     

Effects of single‐case reading interventions for students with and at‐risk of emotional and behavioral disorders in grades K–12: A quantitative synthesis

This study examined the effects of reading interventions from single‐case design studies for students with and at‐risk of emotional and behavioral disorders in grades K–12 using a quantitative synthesis. Seventeen studies met the selection criteria of having one more dependent variables meeting what works clearinghouse (WWC) design standards with or without reservations. Although students’ reading performance significantly improved from baseline to intervention phases (p < 0.001), the overall weighted average effect size was weak (Tau‐U = 0.58, 95% confidence interval = [0.54, 0.63]; d = 0.29); smaller effects were found on reading comprehension. Interventions were less effective for students in secondary grades, students with a comorbid disability, and students in substantially separate settings. While no studies meeting the selection criteria were conducted in inclusive settings, the teacher provided interventions were more effective than those provided by researchers suggesting the importance of the student–teacher relationship for reading instruction. Study limitations, areas for future research, and implications for school practices are discussed.     

From shanzhai chic to Gangnam style: seven practices of cultural-economic mediation in China and Korea

ABSTRACT

This paper examines the social construction of ‘fashionability’ – namely, what is ‘desirable’ and ‘fashionable’ – with reference to the concept ‘cultural mediators’ that foregrounds agency, negotiation and the contested practices of market actors in cultural production. It zeroes in on the cultural mediators’ attitudes and positions in the two markets by drawing on 25 in-depth interviews with industry veterans. It shows that the mediators in South Korea and China increasingly occupy hybrid occupational roles and social positions across industries and sectors yet achieve limited success in countering the status quo of Western fashion through mediation. The analysis contributes to the literature with a categorisation of seven mediation practices that shape the valuation of fashion products (i.e. ‘fashionability’) in two ways. Empirically, this categorisation illuminates how cultural mediators make reference habitually to the broader social and cultural contexts to co-construct cultural-aesthetic objects. Theoretically, it advances a cultural-economic approach to the understanding of cultural mediation and challenges the reductionist viewpoint of actor–network theory through the notion of a matrix of cultural-economic agency.     

User innovation and knowledge sourcing: The case of financial software

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.     

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

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.     

Learning to teach writing through tutoring and journal writing

Structured reflection on practical teaching experiences may help pre‐service teachers to integrate their learning and analyze their actions to become more effective learners and teachers. This study reports on 12 pre‐service English as a second language (ESL) teachers’ individual tutoring of learners of English language writing. The data of the study are the writing journal entries that the pre‐service ESL teachers maintained during their tutoring experience. These journals had common elements: all were used by the pre‐service teachers to consider what funds of knowledge they bring to their teaching of ESL learners, to evaluate their roles as writers, learners and teachers and to reflect on the educational, social and cultural implications of teaching writing in English to speakers of other languages. This article describes ways in which both native and non‐native English speaking pre‐service teachers adapted their instruction to meet the particular needs of individual ESL writers and what they learned in the process. It provides insight regarding the value of using tutoring and reflection generally in teacher education and specifically in the preparation of teachers of ESL.     

Preservice Mathematics Teachers’ Selective Attention and Professional Knowledge–Based Reasoning About Students’ Statistical Thinking

International Journal of Science and Mathematics Education - This study examined preservice mathematics teachers’ selective attention and knowledge-based reasoning as they viewed a statistics...     

Biological Conceptualization of Race

Science & Education - The conception of racial categories from a biological perspective is unconsciously embedded in the individual’s cognition. This is true even among university...     

Neo-institutional analysis on response patterns of pilot schools

This study examines response patterns of pilot schools in the neo-institutional perspective to make improvements on the pilot school systematic framework. In order to achieve this goal, in-depth interviews were conducted to obtain qualitative data. The results show that pilot schools either (a) actively adopt or (b) ceremonially adopt an education policy through the process of implementation and internalization. Among the sampled schools, only one school showed active adoption, and the other three schools pursued ceremonial adoption. Each school’s response varies according to the internalization level, technical core focus, institutional pressure, and reception of legitimacy. The findings of this study suggest that in order to operate the pilot school ‘as a policy school,’ the school members should truly understand the concept of the policy and actively practice the internalized value through various activities and programs. Furthermore, this study calls for a greater attention to the institutional factors and local contexts.