Asynchronous event-triggered observation and control of linear systems via impulsive observers

In this paper we investigate the observation and stabilization problems of a linear plant subject to network constraints and partial state knowledge, making use of the event-triggered technique. In order to address these problems, an impulsive observer is designed. Sufficient conditions are given to ensure a milder version of separation principle for linear systems controlled via an event-triggered controller. The proposed observer ensures practical state estimation, while the corresponding dynamic controller ensures practical stabilization. The sampling and the transmission of the output and the input are done asynchronously. The dynamic controller is tested in simulation on the linearized inverted pendulum.     

Influences of reading online texts in Korean English language learners' cultural identities

This qualitative case study investigated 4 Korean elementary level English language learners' (ELLs) cultural identities when they read online texts at home and school. The participants were fourth- or fifth-grade students. The data consisted of observations, interviews, field notes, reflective journals, and the ELLs' verbal reports at home and school between the spring and the fall of 2010. The author's purpose was to identify the influences of reading online texts at home and school in Korean elementary level ELLs' cultural identities. Findings revealed that the online text readings helped the ELLs form, maintain, and shift their cultural identities. The author discusses Korean ELLs' languages, cultures, and technologies in the contexts of electronic literacies and suggests educational implications to facilitate their reading online texts.     

Determinants of adolescents’ career development competencies in junior secondary schools of South Korea

More attention is needed on the career development of adolescents, specifically disadvantaged students deemed at risk of school failure. We investigated the determinants on career development competencies of 9th graders in secondary school in South Korea. The data in this study included 394 principals, 6635 students, and the students’ parents. Our research confirmed that students with low academic achievement, less parental support, and low family income are relatively disadvantaged in their school-based career development. We suggest that schools provide more preferential attention and care, as well as special career interventions for these disadvantaged students.     

R&D,foreign ownership,and corporate groups: Evidence from Japanese firms

This study empirically examines whether the research and development (R&D) activities of foreign-owned firms in Japan differ notably from the R&D activities of domestically-owned firms based on a firm-level panel dataset. Our study carefully disentangles the significant differences in R&D investment behavior of subsidiaries due to three different reasons: having a foreign parent, corporate group affiliation, and the degree of relatedness between business units. The results reveal the following. First, firms that are majority-owned by another firm are less active in R&D than independent firms. Second, foreign ownership does not matter if the parent firm is from a G7 country, but R&D intensity is significantly and positively associated with foreign ownership if the parent firm is from a non-G7 country. Finally, for subsidiaries whose business is related to that of their parent firm, the R&D intensity is lower if the parent is a domestic firm, but higher if it is a foreign firm. These findings imply that globalization and the integration of firms may not only affect production patterns and global supply chains, but may also have an important impact on the level of domestic R&D activities.     

Acculturation, stress and coping : Some implications for research and education

Acculturation processes are conceptualized as requiring a multivariate model with variables operating at four psychosocial levels: cultural, ethnic, interpersonal and intrapersonal. Examples of changes in mental health status, social networks, cognitive style, social orientation and child rearing values consequent to immigration are considered. The primary focus is on the delineation of several approaches to the study of acculturative stress and coping. These include stressful life events, chronic role strains, and Lazarus's cognitive appraisal model.The implications of the model for research emphasize the importance of multivariate, multi-method, multi-level approaches involving both cross-sectional and longitudinal analyses of situational and process variables. Since the school is a critical acculturation context, an intensified analysis of the strains, stresses and coping responses in that context is required. Promising approaches to such an analysis include parent and teacher cultural sensitivity training, classroom restructuring in order to reduce devaluation of immigrant children by the dominant ethnic group, and stress-innoculation training specifically designed to help children to learn to cope more effectively with the stresses of the school environment.