• 한국IT서비스학회지
• /
• 제11권1호
• /
• pp.305-323
• /
• 2012

This study examines online social media diffusion across different countries that will help to provide a picture of current global online social network services (SNSs). Analyzing country-level data drawn from 78 nations, we find that non-technological factors such as culture and language as well as technological factors including Internet penetration rate and smartphone adoption rate have significant effects on online social media diffusion. These findings, derived from a broad range of different countries, not only provide theoretical insights into understanding critical factors that enable successful global expansion of online social media services but also help practitioners plan their marketing strategies more effectively in a global context.

• International Journal of Knowledge Content Development & Technology
• /
• 제12권3호
• /
• pp.31-49
• /
• 2022

The study presents a global research scenario in the domain of quantum sensing in quantitative and qualitative terms. The study is based on an analysis of 588 global publications in the field, sourced from the Scopus database for the period 1991-2020. The study identified key countries, organizations and authors, network collaborative linkages at national, institutional, and author level. In addition, it identified broad subject areas intersecting quantum sensing research, key journals for research communications, and broad characteristics of highly-cited papers. The study finds that the USA and Germany lead the world ranking in quantum sensing research with a combined share of 50% to the global output. The USA, Germany, and Italy are the home countries to 13 of the top 15 most productive organizations, and also the home countries to 14 of the top 15 most productive authors in the subject. The top journals publishing most research publications are Physical Review A, Physical Review Letters and New Journal of Physics. However, in the most cited journals list in the subject, Agriculture & Forest Meterology, Science and Physical Review A tops the list.

• The Journal of Korean Physical Therapy
• /
• 제20권3호
• /
• pp.9-18
• /
• 2008

Purpose: We determined the effect of global synkinesis(GS) on gait ability, muscle contraction, and central neuron action potentials in post-stroke hemiplegic subjects. Methods: Thirty hemiplegia patients were evaluated for walking ability, muscle contraction, central neuron action potential, and comparing differences between the H-GS(high-global synkinesis) group and L-GS(low-global synkinesis) group. To obtain the GS level, surface electromyography(EMG) data were digitized and processed to root mean square(RMS). Walking ability was tested with a modified motor assessment scale(MMAS), a 10 m walking test, timed up and go(TUG) test, and a Fugl-Meyer assessment(FMA). Muscle contraction ability was measured as maximal isometric contraction(MIC) peak, MIC slope, and MIC ramp up using mechanomyography(MMG). Central neuron action potential was measured as the H/Mmax ratio or V/Mmax ratio using EMG. The data were analyzed with t-tests to determine the statistical significance. Results: MMAS(p<0.01), 10 m walking velocity(p<0.01), TUG(p<0.01), FMA-HKA(Hip, Knee, Ankle)(p<0.05), FMA-coordination(p<0.05), MIC peak (p<0.05), MIC slope(p<0.01), and MIC ramp up(p<0.05) were significantly different between H-GS and L-GS, as was the V/Mmax ratio(p<0.05), but H/Mmax was not. Conclusion: Lower GS levels indicated better walking ability and motor function. Therefore, intervention programs should consider GS levels in gait training of chronic hemiplegia.

• Journal of Preventive Medicine and Public Health
• /
• 제47권3호
• /
• pp.136-143
• /
• 2014

The Global Burden of Disease (GBD) study has been instrumental in guiding global health policy development since the early 1990s. The GBD 2010 project provided rich information about the key causes of mortality, disability-adjusted life years, and their associated risk factors in Japan and provided a unique opportunity to incorporate these data into health planning. As part of the latest update of this project, GBD 2013, the Japanese GBD collaborators plan to update and refine the available burden of disease data by incorporating sub-national estimates of the burden of disease at the prefectural level. These estimates will provide health planners and policy makers at both the national and prefectural level with new, more refined tools to adapt local public health initiatives to meet the health needs of local populations. Moreover, they will enable the Japanese health system to better respond to the unique challenges in their rapidly aging population and as a complex combination of non-communicable disease risk factors begin to dominate the policy agenda. Regional collaborations will enable nations to learn from the experiences of other nations that may be at different stages of the epidemiological transition and have different exposure profiles and associated health effects. Such analyses and improvements in the data collection systems will further improve the health of the Japanese, maintain Japan's excellent record of health equity, and provide a better understanding of the direction of health policy in the region.

• Journal of Korea Trade
• /
• 제24권7호
• /
• pp.54-72
• /
• 2020

Purpose - This study explores the contextual factors that affect the relationship between CEO overseas experience and firm internationalization. This study incorporates a wide range of contextual factors, including mega, macro, and micro variables. In particular, this study goes a step further from prior studies by incorporating a higher-order variable i.e., the global financial crisis that can constrain the managerial discretion of a CEO. Design/methodology - To structure the balanced data set before and after the 2008 global financial crisis, we used the data for the years from 2002 to 2014 from a sample of Korean manufacturing firms. Ultimately, 1101 firm-year unbalanced panel observations from 101 firms were used for the analysis. Findings - Our main findings can be summarized as follows. CEO overseas experience is positively related to firm internationalization. However, this relationship varies depending on the CEOs level of managerial discretion. As for the constraining moderation, the global financial crisis weakened the positive relationship between CEO overseas experience and firm internationalization. As for the enabling moderation, the CEOs tenure strengthened the relationship. Originality/value - This study adopted the knowledge, skills, and abilities (KSA) framework to explain the relationship between CEO overseas experience and firm internationalization. Moreover, we argue that the CEO-internationalization relationship depends on the specific context of the managerial discretion, focusing on the 2008 global financial crisis. Empirically, this study adopted the 2SLS procedure to correct endogeneity. Instead of taking the actual value of prior internationalization as a control, we estimated prior internationalization using the instrument variables at an industry level. This procedure made our estimation more robust.

• 한국지구과학회지
• /
• 제36권6호
• /
• pp.520-532
• /
• 2015

황해 동부 해안의 홀로세 해수면 변동 특성을 이해하고 시기 별 상승추세를 비교하기 위하여 지질학적 대리기록과 기기관측 자료를 통합하여 분석하였다. 홀로세 동안 황해의 해수면은 초기에 약 10 mm/yr의 속도로 빠르게 상승하고 중기를 거쳐 후기로 갈수록 해수면 상승률은 1 mm/yr 정도로 둔화되며, 20세기 해수면은 홀로세 후기보다 다소 빠르게 상승하였다. 빠른 상승으로 알려진 현재 해수면 상승률은 홀로세 초기와 중기의 상승추세와 비교할 때 사실 훨씬 낮거나 비슷하게 나타난다. 최근 조위계 자료는 황해 해수면이 21세기로 갈수록 상승률이 높아지고 있음을 나타낸다. 이러한 상승 추세는 전 지구적 해수면 변화와 일치한다. 추가적으로, 연구지역에서 현재의 해수면 상승 추세는 이산화탄소 농도와 해수표층온도의 증가율과 대비되며, 이는 인간활동에 수반된 지구온난화의 신호이다. 그러므로 황해 동부와 전세계의 해양에서 관찰되는 현 지구온난화에 의해 야기된 해수면 변화를 '인류세' 해수면 변화라고 제안한다. 이 해수면변화는 조위계와 인공위성 고도계 같은 기기관측을 기반으로 하며, 계측시대를 의미한다. 이와 같이, 황해의 홀로세 해수면 변동은 대리기록으로, '인류세' 해수면은 기기관측을 기반으로 한다.

• 한국지구과학회지
• /
• 제32권7호
• /
• pp.784-797
• /
• 2011

이 연구에서는 고등학생들의 시스템 사고 향상을 위해 지구온난화 주제를 중심으로 교육프로그램을 개발하고 이를 학교 현장에 적용하여 학생들의 시스템 사고 향상 정도를 파악하였다. 현직 교사와 전문가들에게 타당성을 검증 받은 지구온난화 교육프로그램을 학생 27명에게 투입하였으며 시스템 사고 수준이 낮은 학생 3명과 수준이 높은 학생 3명, 총 6명의 학생을 연구대상으로 선정하고 활동 전 후로 단어 간 관계분석, 인과지도 그리기, 그림 그리기를 적용하여 시스템 사고 수준 변화정도를 살펴보았다. 그 결과 시스템 사고 수준이 낮은 그룹은 활동 후 지구온난화에 대한 시스템 사고 정도가 향상된 모습을 보였으나 오개념이 유지되는 특성을 보였다. 그리고 시스템 사고 수준이 높은 학생들은 자신들이 가지고 있었던 개념들은 활동 후 더 뚜렷해지고 체계적인 시스템 사고를 하고 있었다. 학생들에게 지구시스템과 연결된 지식이나 지구 환경 개념을 학습하는 데 있어서 필요한 시스템 사고를 함양시키고 과학교육과정에 새로운 활력을 불어넣기 위해서는 이러한 교육프로그램들이 많이 개발되어야 하며 또한 실제 학교 현장에서 많이 활용할 수 있도록 개발된 자료들이 잘 보급될 수 있어야 할 것이다.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2004년도 봄 학술발표회 논문집
• /
• pp.87-94
• /
• 2004

A number of approximate techniques have been developed to calculate the eigenvalues in a reduced manner. These schemes approximate the lower eigenvalues that represent the global behavior of the structures. In general, sequential elimination has been widely used with reliability. But it takes excessively large amount of time to construct a reduced system. The present study proposes two-level condensation scheme(TLCS). In the first step, the candidate elements are selected by element-level energy estimation. In the second step, master degrees of freedom are selected by sequential elimination from the candidate degrees of freedom linked to the selected elements in the first step. Numerical examples demonstrate that the proposed method saves computational cost effectively and provides a reduced system which predicts the accurate eigenvalues of global system.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제13권4호
• /
• pp.267-280
• /
• 2009

In this paper we investigate a simple two-level additive Schwarz preconditioner for the P1 symmetric interior penalty Galerkin method of the Poisson equation on rectangular meshes. The construction is based on the decomposition of the global space of piecewise linear polynomials into the sum of local subspaces, each of which corresponds to an element of the underlying mesh, and the global coarse subspace consisting of piecewise constants. This preconditioner is a direct combination of the block Jacobi iteration and the cell-centered finite difference method, and thus very easy to implement. Explicit upper and lower bounds for the maximum and minimum eigenvalues of the preconditioned matrix system are derived and confirmed by some numerical experiments.

• 한국산업정보학회:학술대회논문집
• /
• 한국산업정보학회 2008년도 추계 공동 국제학술대회
• /
• pp.48-53
• /
• 2008

The information technology, in the digital economy era, does a very important role not only for the country's administrative management innovation but also for the business and for the everyday life. Specifically, the e-business for the company or organization is defined as "using the Internet and IT, rescheduling of business process management activities to increase productivity and efficiency and to create new business opportunities." Thanks to the Korea's recent efforts, overall level of informatization and digitalization is able to receive high praise. But the e-business readiness (e-readiness) level is still expected a lot of room for improvement. In this paper, I try to analyze the informatization level of Korea's by the EIU's e-business readiness index and IT industry competitiveness index, to prepare a full-scale e-business era of global competitiveness through any preparation that could do to improve the situation from the analysis of statistical data.