Stochastic stability analysis of piecewise homogeneous Markovian jump neural networks with mixed time-delays     

Zheng-Guang Wu  Ju H. Park  Hongye Su  Jian Chu 《Journal of The Franklin Institute》2012,349(6):2136-2150

In this paper, the problem of stochastic stability analysis is considered for piecewise homogeneous Markovian jump neural networks with both discrete and distributed delays by use of linear matrix inequality (LMI) method. Based on a Lyapunov functional that accounts for the mixed time-delays, a delay-dependent stability condition is given, which is formulated by LMIs and thus can be easily checked. Some special cases are also investigated. Finally, a numerical example is given to show the validness of the proposed result.  相似文献   

Product architecture,organizational capabilities and IT integration for competitive advantage     

YoungWon Park  Takahiro Fujimoto  Paul Hong 《International Journal of Information Management》2012

Increasingly, firms recognize the strategic implications of front-end product design for improving total cost effectiveness. Computer-aided design (CAD) is becoming firms’ competitive weapon beyond its traditional function as a product design tool. Yet, it is unclear how the full potential of IT system, particularly the usage patterns of 3D CAD system, may be realized through organizational capabilities. This paper presents a model of IT system configurations and CAD usage patterns. Next, a typology of IT system configurations is presented based on (1) the degree of CAD integration between assembly makers and suppliers and (2) the structure of product design information (i.e., product architecture). The product architecture of four electronic firms illustrates that information integration through organizational capabilities is more important than IT investment itself. The findings suggest that a Korean firm accomplishes a greater level of IT integration compared to the other two Japanese firms and thus attain better market performance. This study offers valuable insight on effective IT integration strategy for competitive advantage in the global market.  相似文献   

Appropriate intellectual property protection and economic growth in countries at different levels of development   总被引：1，自引：0，他引：1  

Yee Kyoung KimKeun Lee  Walter G. Park  Kineung Choo 《Research Policy》2012,41(2):358-375

This paper examines how the role of patents and utility models in innovation and economic growth varies by level of economic development. Using a panel dataset of over 70 countries, we find that patent protection is an important determinant of innovation and that patentable innovations contribute to economic growth in developed countries, but not in developing. Instead, in developing economies, a minor form of intellectual property rights (IPRs) - namely utility models - is conducive to innovation and growth, controlling for other factors. Using Korean firm level data as a case study, we find that utility model innovations contribute to firm performance when firms are technologically lagging and that those minor innovations can be a learning device and thus a stepping stone for developing more patentable inventions later on. Upon reaching higher levels of technological capabilities, firms become more reliant upon patents and less on utility models. Thus the lesson here is that patent protection enhances innovation and economic growth in countries where the capacity to conduct innovative research exists. Where this capacity is weaker, a system that provides incentives to conduct minor, incremental inventions is more conducive to growth. The significance of this paper is to emphasize the importance not just of the strength of IPRs but of the appropriate type of IPRs for economic development.  相似文献   

High school students' evolving alternative conception related to the volume of gas: A Lakatosian perspective     

Chulkyu Park  Seonyeong Mun  Hun-Gi Hong 《科学教学研究杂志》2024,61(3):674-705

The purpose of this case study, informed by a Lakatosian perspective, is to identify how an alternative conception that originates in present learning but is related directly to subsequent learning contexts can be constructed. Before the study, one of the authors found by accident that a student who had learned about Avogadro's principle and chemical reaction in South Korea constructed an alternative conception related to the volume of gas. Later, we identified seven Korean high school students with the alternative conception through a test and analyzed their underlying understandings qualitatively through interviews. The results show that they had a scientific conception—core conception—and intuitive assumptions about implicit information of external representations—implicit assumptions—in common. The students' implicit assumptions could be divided into three types again: core assumption, auxiliary assumption, and context-inducing assumption. The core assumption, like the core conception, played a significant role in constructing the alternative conception (hard core), while the auxiliary assumptions were incomplete implicit assumptions to protect the alternative conception (protective belt). The context-inducing assumption was an implicit assumption bringing the context of the subsequent curriculum, and the core conception and the core assumption could be interpreted in this induced context. At the end of the study, the implications related to learning progressions were discussed.  相似文献   

Teacher commitment and its effects on student achievement in American high schools     

Insim Park 《Educational Research and Evaluation》2013,19(5):461-485

This study explored the effects of teacher commitment on student achievement. Three teacher commitment dimensions of organizational, professional, and student commitment were derived. The three-dimensional teacher commitment measurement model was tested by a confirmatory factor analysis. Then, the relationships among individual and organizational variables, teacher commitment, and student achievement were analyzed by a 2-level hierarchical linear modeling method. As the results, the greater portions of teacher commitment and student achievement variances were within schools. The individual and organizational variables had differential impacts on each teacher commitment dimension. Finally, while teacher commitment effects on student achievement were differentially found depending on teacher commitment dimensions at the individual level, there was no evidence to support significant impacts of teacher commitment on student achievement at the organizational level.  相似文献   

Why are we using action learning and in what contexts?     

Sunyoung Park  Ingu Kang  Taryn R. Valencic  Yonjoo Cho 《Action Learning: Research and Practice》2013,10(1):4-24

The purpose of this study was to examine the contexts in which action learning has been used and provide implications for the design of action learning programmes. We performed a content analysis of 127 articles (case studies and case reports included) published in Action Learning: Research and Practice between 2004 and 2012. In this study, we address the following research questions: (a) In what contexts has action learning been used? (b) What are the distinctive features of cases identified? (c) What are the implications for the design of action learning programmes? The results showed that the UK and European countries have most frequently used action learning, and the most dominant purposes for action learning were leadership development, organization development, and professional development. We also elaborated on design considerations and implications for action learning research and practice.  相似文献   

Influential factors for knowledge creation practices of CTE teachers: mutual impact of perceived school support, transformational leadership, and work engagement     

Ji Hoon Song  Sang Hoon Bae  Sunyoung Park  Hye Kyoung Kim 《Asia Pacific Education Review》2013,14(4):467-482

This study examined the structural relationships among perceived school support, transformational leadership, teachers’ work engagement, and teachers’ knowledge creation practices. It also investigated the mediating effects of transformational leadership and work engagement in explaining the association between perceived school support and knowledge creation practices. Samples included 284 career and technical education teachers in the United States. Structural equation modeling was employed. Perceived school support was positively associated with transformational leadership and teachers’ work engagement, but had no direct impact on knowledge creation practices. Transformational leadership was found to affect knowledge creation practices, but not work engagement of teachers. Although a supportive school climate had no direct relationship with knowledge creation practices, it indirectly affected this outcome variable through transformational leadership and teachers’ work engagement. The results suggest that in order to increase teachers’ knowledge creation activities, a supportive school climate should be provided with efforts to improve teachers’ work engagement and transformational behaviors of the principal.  相似文献   

Cross-cultural language learning and web design complexity     

Ji Yong Park 《Interactive Learning Environments》2013,21(1):19-36

Accepting the fact that culture and language are interrelated in second language learning (SLL), the web sites should be designed to integrate with the cultural aspects. Yet many SLL web sites fail to integrate with the cultural aspects and/or focus on language acquisition only. This study identified three issues: (1) anthropologists’ cultural models mostly adopted in cross-cultural web user interface have been superficially used; (2) web designers deal with culture as a fixed one which needs to be modeled into interface design elements, so (3) there is a need for a communication framework between educators and design practitioners, which can be utilized in web design processes. This paper discusses what anthropology can contribute to language learning, mediated through web design processes and suggests a cultural user experience framework for web-based SLL by presenting an exemplary matrix. To evaluate the effectiveness of the framework, the key stakeholders (learners, teachers, and designers) participated in a case scenario-based evaluation. The result shows a high possibility that the framework can enhance the effective communication and collaboration for the cultural integration.  相似文献   

Stabilization of switched linear singular systems with state reset     

Xiaoqing Xiao  Ju H. Park  Lei Zhou 《Journal of The Franklin Institute》2019,356(1):237-247

This paper investigates the stability and stabilization of switched linear singular systems with state reset at switching instants. Based on the dynamics decomposition of singular subsystems, a sufficient stability condition for the system with the given state reset is obtained. Then, the stabilization problem by state reset is investigated and an algorithm for computing the reset matrices is presented. The obtained results extend some previous works on both singular switched systems and reset control for normal switched systems. Finally, a numerical example is presented to illustrate the effectiveness of the proposed approach.  相似文献   

The current state of human performance technology: A citation network analysis of Performance Improvement Quarterly, 1988–2010     

Yonjoo Cho  Sung Jun Jo  Sunyoung Park  Ingu Kang  Zengguan Chen 《Performance Improvement Quarterly》2011,24(1):69-95

This study conducted a citation network analysis (CNA) of human performance technology (HPT) to examine its current state of the field. Previous reviews of the field have used traditional research methods, such as content analysis, survey, Delphi, and citation analysis. The distinctive features of CNA come from using a social network analysis approach to see relational and network patterns in the citation data. This CNA found that the Performance Improvement Quarterly network showed more widely but loosely connected and less centralized structural attributes than the human resource development network; the 10 most influential articles in the field were identified; frequently co‐cited articles were recognized as having a strong relationship by subsequent researchers; and five cohesive subgroups showed key topics in the field (performance, instructional design, performance support, organization/workplace, and transfer of training). Implications from the results of the CNA were elaborated on for future research in HPT.  相似文献