• 한국산업정보학회논문지
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• 제21권2호
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• pp.11-20
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• 2016

본 논문에서는 항공기를 이용하여 지진이나 쓰나미가 발생한 광범위한 재난 지역이나 인터넷 오지에서의 무선 인터넷 서비스를 제공하기 위한 글로벌 무선통신망의 구축 가능성에 대해 논의한다. 먼저 한국, 일본, 유럽, 미국의 상공 위를 지나가는 항공기의 운항 데이터를 수집하고 무선통신 장치를 탑재한 항공기는 항상 일정 지역을 대상으로 무선통신 서비스를 제공한다고 가정한 후 각 지역에서 항공기를 통해 어느 정도의 범위로 무선통신 서비스가 가능한지 계산하기 위한 서비스 영역 계산 방법론을 제시한다. 서비스 영역 계산 알고리즘을 통하여 각 지역 상공 위에 체공하는 모든 항공기를 대상으로 시간별로 무선 인터넷 서비스 가능 영역을 전체 대비 평균 가용 지역 비율로 계산하고 누적 서비스 가능 밀도도 계산한다. 이를 통해 항공기를 이용한 글로벌 무선통신망의 구축이 가능함을 확인한다.

• Steel and Composite Structures
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• 제42권4호
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• pp.447-458
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• 2022

Cold-formed steel (CFS) sections are thin-walled, therefore, more susceptible to different types of geometric imperfections. Global type of geometric imperfections has a significant impact on the load-carrying capacity of flexural members. This paper reports an experimental study that discusses the influence of global imperfections on the flexural response of CFS built-up I-beams composed of two lipped channels, with simply supported ends, under four-point loading. Global imperfections of magnitude over eight times the maximum permissible ones were induced in the specimens, leading to their distress. Using various simple stiffening schemes, the capacity and stiffness of the distressed specimens were improvised. The performance comparisons were made based on the maximum loads resisted, flexural stiffnesses offered, and failure modes experienced by the specimens. As experimental data on such distressed specimens are currently lacking in the literature, the test results of the present study will provide the necessary data needed by future researchers to numerically extend this study further, which will help in the development of necessary design guidelines for the same. The stiffening schemes significantly improved the structural efficiency of distressed specimens in terms of strength and stiffness, by over 60%. As a result, an effective and time-saving solution to such realistic structural engineering problems is given.

• The Journal of Asian Finance, Economics and Business
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• 제9권1호
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• pp.189-201
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• 2022

The study empirically examines the impact of monetary fundamentals along with global oil prices on the Pak-rupee exchange rate using the monthly data over 2001-2020. Employing the cointegrating vector autoregressive with exogenous variables (VARX) and vector error correction model with exogenous variables (VECMX), the study analyzes the impact of domestic monetary fundamentals while considering the foreign variables as weakly exogenous. In order to account for the structural breaks in the data, the Lagrange multiplier (LM) unit root test with two structural breaks has been used (Lee & Strazicich, 2003). The empirical results reveal that the domestic and foreign monetary variables significantly explain the exchange rate movements in Pakistan both in the long run and in the short run. The dynamic properties of the monetary model of exchange rate have been analyzed using the persistence profile analysis and generalized impulse response functions (GIRFs). The results reveal that the responses of shocks to domestic monetary fundamentals are consistent with the predictions of the monetary model of the exchange rate. Furthermore, being a net oil importer, a rise in global oil prices significantly depreciated the Pak-rupee exchange rate over the period of study. The global financial crisis (GFC) and pandemic (COVID-19) were also found to cause the Pak-rupee exchange rate depreciation.

• Structural Engineering and Mechanics
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• 제90권2호
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• pp.117-125
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• 2024

This article presents the behaviour and design of cold-formed steel (CFS) web-stiffened lipped channel beams that primarily fail owing to the buckling interaction of distortional and global buckling modes. The incorporation of an intermediate stiffener in the web of the lipped channel improved the buckling performance leads to distortional buckling at intermediate length beams. The prediction of the strength of members that fail in individual buckling modes can be easily determined using the current DSM equations. However, it is difficult to estimate the strength of members undergoing buckling interactions. Special attention is required to predict the strength of the members undergoing strong buckling interactions. In the present study, the geometric dimensions of the web stiffened lipped channel beam sections were chosen such that they have almost equal distortional and global buckling stresses to have strong interactions. A validated numerical model was used to perform a parametric study and obtain design strength data for CFS web-stiffened lipped channel beams. Based on the obtained numerical data, an assessment of the current DSM equations and the equations proposed in the literature (for lipped channel CFS sections) is performed. Suitable modifications were also proposed in this work, which resulted in a higher level of design accuracy to predict the flexural strength of CFS web stiffened lipped channel beams undergoing distortional and global mode interaction. Furthermore, reliability analysis was performed to confirm the reliability of the proposed modification.

• 지역사회간호학회지
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• 제26권3호
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• pp.209-220
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• 2015

Purpose: This study developed a short-term education program aiming to strengthen global health capacity in nursing students, and examined the effects of the program. Methods: The subjects of this study were 83 students recruited from 29 nursing colleges. Domestic workshops and overseas training in the Philippines were offered. For data collection and analysis, the triangulation method was adopted. Results: Students' critical thinking disposition and global leadership capacity were significantly increased. Thematic content analysis derived fifteen themes: expansion of global health, understanding of cultural diversity, vision of being a global leader, cultivation of communication skills, open mind toward people with different culture, pride and vocation, understanding of nursing in foreign countries, understanding of visiting nurse service, sustainability, understanding of local needs and environments, and education methods with an emphasis on participants, broader view and thinking of the world, reflection on the characteristics of a nurse, development through cooperation, and development through programs. Conclusion: The global health capacity building program improved nursing students' view of global health and nursing care. It is needed to develop continuously diverse global health capacity-building programs for nursing students.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.116-121
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• 1998

Global land related datasets such as land use, land cover, vegetation cover percentage, forest cover percentage, are part of important global geospatial environmental datasets for global change studies. Since land cover varies place by place, continental production of dataset is a usual approach. Western academically developed countries have some projects to describe land cover related information in digital form using remote sensing technology in African, American continent and Oceania. In this paper, the author introduce his initiative to coordinate Asian scientists in order to develop land related dataset of Asia for our better understanding of the environment of Asia and for contribution to the development of global dataset. This paper explains activities by Land Cover Working Group (LCWG) of the Asian Association on Remote Sensing(AARS), Data and Information System(DIS) sub-committee of Japan national committee for the International Geosphere and Biosphere Program(IGBP), and the International Society for Photogrammetry and Remote Sensing(ISPRS) Working Group IV/6 on Global databases supporting environmental monitoring.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.226-226
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• 2015

The complex climate system regarding human actions is well represented through global climate models (GCMs). The output from GCMs provides useful information about the rate and magnitude of future climate change. Especially, the temperature variable is most reliable among other GCM outputs. However, hydrological variables (e.g. precipitation) from GCM outputs for future climate change contain too high uncertainty to use in practice. Therefore, we propose a method that simulates temperature variable with increasing in a certain level (e.g. 0.5oC or 1.0oC increase) as a global warming scenario from observed data. In addition, a hydrometeorological variable can be simulated employing block-wise sampling technique associated with the temperature simulation. The proposed method was tested for assessing the future change of the seasonal precipitation in South Korea under global warming scenario. The results illustrate that the proposed method is a good alternative to levy the variation of hydrological variables under global warming condition.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2024년도 제69차 동계학술대회논문집 32권1호
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• pp.437-438
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• 2024

인구가 감소하고 있는 농어촌의 지역경제를 살림과 동시에 지역 소멸을 예방하고, 정착 지역 탐색에 많은 시간을 할애하는 귀농희망자들을 위해 도움을 줄 수 있는 데이터베이스를 설계하고 구축하였다. 사용자는 이 데이터베이스를 활용하여 사용자가 원하는 조건에 맞는 상위 5개 지역을 추천받을 수 있다. 정부와 기업이 귀농 지역 추천 데이터베이스를 활용하여 귀농을 희망하는 사람들의 행태를 알아보면 농촌 지역과 지방 소도시 지역 개발 및 활성화를 긍정적으로 예상할 수 있고, 이러한 관심이 결과적으로는 우리나라의 국토 균형발전에 큰 도움이 될 것이다.

• East Asian Economic Review
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• 제28권1호
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• pp.95-140
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• 2024

This study empirically investigates the international transmission of China's uncertainty shocks. It estimates a time-varying parameter Bayesian global structural vector autoregressive model (TVP-BGVAR) using time series data for 33 countries to evaluate heterogeneous international linkage across countries and time. Uncertainty shocks are identified via sign restrictions. The empirical results reveal that an increase in uncertainty in China negatively affects the global economy, but those effects significantly vary over time. The effects of China's uncertainty shocks on the global economy have been significantly altered by China's WTO accession, the global financial crisis, and the recent US-China trade conflict. Furthermore, the effects of China's uncertainty shocks, typically on inflation, differ significantly across countries. Moreover, Trade openness appears crucial in explaining heterogeneous GDP responses across countries, whereas the international dimension of monetary policy appears to be important in explaining heterogeneous inflation responses across countries.

• Kyungpook Mathematical Journal
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• 제64권1호
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• pp.95-111
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• 2024

The filled function method is useful in solving unconstrained global optimization problems. However, depending on the type of function, and parameters used, there are limitations that cause difficultiies in implemenations. Exponential and logarithmic functions lead to the overflow effect, requiring iterative adjustment of the parameters. This paper proposes a polynomial-filled function that has a general form, is non-exponential, nonlogarithmic, non-parameteric, and continuously differentiable. With this newly proposed filled function, the aforementioned shortcomings of the filled function method can be overcome. To confirm the superiority of the proposed filled function algorithm, we apply it to a set of unconstrained global optimization problems. The data derived by numerical implementation shows that the proposed filled function can be used as an alternative algorithm when solving unconstrained global optimization problems.