• The Journal of Asian Finance, Economics and Business
• /
• 제5권4호
• /
• pp.201-211
• /
• 2018

The paper suggests making a policy and strategies for a way of exporting Korean ICT product effectively in the EU and Eastern area, and an effective preparation of 4^th industrial revolution through analysis of preparation status of 4^th industrial revolution of the Visegrad group. Analyze policy, status, what they want for 4^th preparation in the Visegrad group from comparing characteristics analysis of each country's official data, publication data, portal, paper, and etc. They have been preparing for 4^th industrial revolution long time ago as basic research and business before 4^th wave word. With these basic results, they are trying to apply such as, AI, S/W, security, ICT, etc. of 4^th wave core technology. For the development of new export market in EU, the Korean team should research with university and research center or venture company. Through these cooperation, they should understand their personal characteristic, lifestyle, and what consumers want to purchase in EU. And this results can be used in South Asia and India that give a big effect to all over the world ICT market. The external impact of the 4^th wave must have a long-term shift in manpower, and production policy is related to the EU's strategic role, or the preparation of the 4^th wave to the V4 country in the short term.

• 한국해안·해양공학회논문집
• /
• 제28권2호
• /
• pp.73-80
• /
• 2016

파의 왕복운동을 지속적인 일방향 회전운동으로 유도하여 발전기의 가동에 있어 기계적인 손실 에너지를 감소시켜 발전효율을 극대화시킬 수 있는 파의 수평왕복운동을 직접 이용하는 가동물체형 파력발전장치가 개발되었다. 그리고 실제 전력생산에 관한 수리실험이 수행되었고 그 결과가 토의되었다. 수리실험에서 부력 탱크의 형상에 따른 발전장치의 발전효율은 파력판의 무게를 충분히 지탱하는 직경 9 cm의 고정식 부력 탱크가 평균발전효율 14.6%로 좋은 결과를 보였으며 효율이 좋을 것으로 기대되었던 부력 탱크가 자유로이 승강하는 경우는 발전효율이 8.5%로 좋지 못한 결과를 보였다. 그리고 여러 파랑조건에 따른 직경 9 cm의 고정식 부력 탱크형 발전모형의 평균발전 효율이 수심 90 cm에서 기어비 2단 3.9%, 3단 4.9%, 4단 4.9%, 5단 12%, 6단 10.0%, 7단 3.1%, 그리고 8단 3.0%를 나타냈으며, 수심 80 cm의 기어비 5단에서 15%의 발전효율이 계측되었다. 따라서 이 파력발전장치는 수심 80~90 cm의 기어비 5단에서 비교적 높은 13.5%의 평균발전효율을 얻을 수 있었다.

• 한국군사과학기술학회지
• /
• 제19권4호
• /
• pp.500-507
• /
• 2016

In order to increase the survivability of combatant ship, measuring and analyzing the infrared radiation is important. Consequently, providing analysis report is also important for the progress of the new combatant ship design. This paper proposes a design and software implementation of filtering for the noise reduction of mid-wave IR camera image. We reduced the total test cost by using the suggested software filtering technique instead of hardware replacement or re-calibration. In addition, we enhanced the accuracy of analysis results by adjusting the parameters of software filtering according to the results of filtered image.

• 한국보육지원학회지
• /
• 제20권1호
• /
• pp.39-53
• /
• 2024

Objective: The purpose of this study is to investigate whether emotionality at age three predicts early school-age media overdependence and to examine the potential mediating role of internalizing behavior problems in children. Methods: This study employed data from the 4th and 10th waves of the Panel Study of Korea Children, comprising a sample of 1,270 children. Assessments of emotionality (4th wave), media overdependence (10th wave), and internalizing behavior problems (10th wave) were conducted. Data analysis utilized SPSS and the Process Macro. Results: At age 3, heightened emotionality was found to directly contribute to an increased tendency for media overdependence in early school age. Internalizing behavior problems played a significant mediating role in the relationship between emotionality and media overdependence. Conclusion/Implications: This study validated a significant longitudinal connection between emotionality and the inclination to excessively rely on media, highlighting the role of internalization behavior problems in this relationship. It is essential to provide focused attention, especially to children displaying heightened emotionality in early childhood, in order to proactively prevent internalization behavior problems and the undue dependence on media.

• 대한간호학회지
• /
• 제53권4호
• /
• pp.453-467
• /
• 2023

Purpose: This study investigated the cumulative effects of depressive symptoms on cognitive function over time in community-dwelling older adults. Methods: Data were investigated from 2,533 community-dwelling older adults who participated in the Korean Longitudinal Study of Aging (KLoSA) from the 5th (2014) to the 8th wave (2020). The association between cumulative depressive symptoms and cognitive function was identified through multiple regression analysis. Results: When the multiple regression analysis was conducted from each wave, the current depressive symptoms scores and cognitive function scores were negatively associated, regardless of the waves (B5th = - 0.26, B6th = - 0.26, B7th = - 0.26, and B8th = - 0.27; all p < .001). Further, when all the previous depressive symptoms scores were added as explanatory variables in the 8th wave, the current one (B8th = - 0.09, p < .001) and the previous ones (B5th = - 0.11, B6th = - 0.09, and B7th = - 0.13; all p < .001) were also negatively associated with the cognitive function score. The delta R², which indicates the difference between the model's R² with and without the depressive symptoms scores, was greater in the model with all the previous and current depressive symptoms scores (6.4%) than in the model with only the current depressive symptoms score (3.6%). Conclusion: Depressive symptoms in older adults have a long-term impact. This results in an accumulated adverse effect on the cognitive function. Therefore, to prevent cognitive decline in older adults, we suggest detecting their depressive symptoms early and providing continuous intervention to reduce exposure to long-term depressive symptoms.

• 전자공학회논문지
• /
• 제51권8호
• /
• pp.3-10
• /
• 2014

최근 폭증하는 모바일 데이터 트래픽을 수용하기 위하여 밀리미터파 (mmWave)가 큰 관심을 받고 있으며, 4 세대 LTE-A(Long Term Evolution-Advanced) 표준을 기반으로 MMB (Millimeter Mobile Broadband) 시스템의 필요성이 대두되고 있다. 현재 mmWave 통신 채널에 대한 많은 연구가 이루어지고 있으며, MMB 채널 환경에 대한 성능 분석 또한 관심의 대상이다. 본 논문에서는 5세대 이동통신을 위한 MMB 시스템을 설계하고 mmWave의 전파 특성 분석을 통한 채널 모델을 제안한다. 또한 MMB 시스템의 28 GHz 대역에서 MMB 채널 환경에 대한 성능을 비교 분석한다.

• 한국군사과학기술학회지
• /
• 제19권4호
• /
• pp.462-468
• /
• 2016

In this paper, we present the results of the numerical analysis employing CONWEP, LS-DYNA FSI(Fluid Structure Interaction), AUTODYN FSI, LS-DYNA ALE(Arbitrary Lagrange Eulerian) and combination of CONWEP and LS-DYNA ALE for blast door fracture and wave propagation through the tunnel by the external explosion. We compared the numerical analysis results with the subscale test data and selected combination of CONWEP and LS-DYNA ALE method as adequate data generation method for the FRM(Fast Running Model) software development. It is expected to save much time and costs by using the numerical simulation data for the various test conditions.

• 한국해안해양공학회지
• /
• 제12권4호
• /
• pp.157-167
• /
• 2000

한국해양연구소는 1998년에 이어도 종합해양과학기지의 기본설계를 수행한 바 있으며 심해 설계파에 Morison 식과 Stream function 이론을 적용하여 설계파력을 결정한 바 있다. 본 연구에서는 삼차원 수리모형실험 통하여 이어도 해역에서의 파랑전파를 모의하였으며, 구조물의 파력 및 Air gap를 계측하고 이들을 SACS 프로그램의 계산치와 비교함으로써 기본설계 값들의 타당성을 검토하였다. 그 결과, 시도된 4개의 심해파향 중에서 SSW, S, SE계열의 파향에 대해서는 계측치가 SACS 계산치 보다 작게 나타났다. 그러나, 유일하게 구조물에 미치기 전에 쇄파되는 NNW계열의 파향에서는 전반적으로 SACS 계산치를 상회하였으며, 그방향성 흐름과 파가 복합되어 있는 경우와 매우 유사한 파력변화를 보여주었다. 구조물의 Air gap은 모든 심해파향에 대하여 계측치가 기본설계치보다 작은 것으로 나타났다.

• 한국해양공학회지
• /
• 제20권4호
• /
• pp.31-36
• /
• 2006

Numerical schemes for spacing and time are tested to accurately simulate the wave propagation. The tested numerical schemesinclude 2nd-order central differencing, l-order upwind scheme, 2nd-order Leith scheme, 3rd-order MUSCLE, QUICK and QUICKEST schemes in spacing and the Euler and 4th-order Runge-Kutta(R-K) schemes in time. It is seen that more accurate results are expected when the higher-order schemes, especially the schemes combined with a TVD control limiter, are used for solving the wave equation. The 3rd-order upwind scheme with limiter and the 4th-order R-K scheme in tim￡ are finally applied to the wave-making simulation in a digital wave tank.

• 대한가정학회지
• /
• 제47권1호
• /
• pp.65-73
• /
• 2009

The present longitudinal study examined reciprocal influence between self-esteem and academic achievement using cross-lagged autoregressive model. This study employed data(four wave) from Korea Youth Panel Survey. Participants were 300 students(143 boys, 157 girls) who were 4th graders in 2004 and 7th graders in 2007. The results of this study indicated that 4th graders' self-esteem influenced 5th graders' academic achievement, in turn, 5th graders' academic achievement influenced 6th graders' self-esteem. However, students' self-esteem in 6th grade did not influence their academic achievement during 7th grade. Conversely, 6th graders' academic achievement influenced 7th graders' self-esteem.