• Title/Summary/Keyword: 4th wave

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Analysis Research on Preparation of 4th Wave (AI) of the Visegrad Group

  • Kim, Dong Hwa;Seo, Dae-Sung
    • The Journal of Asian Finance, Economics and Business
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    • v.5 no.4
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    • pp.201-211
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    • 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 4th industrial revolution through analysis of preparation status of 4th industrial revolution of the Visegrad group. Analyze policy, status, what they want for 4th 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 4th industrial revolution long time ago as basic research and business before 4th wave word. With these basic results, they are trying to apply such as, AI, S/W, security, ICT, etc. of 4th 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 4th 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 4th wave to the V4 country in the short term.

Development of a Moving Body Type Wave Power Generator using Wave Horizontal Motions and Hydraulic Experiment for Electric Power Production (파의 수평운동을 이용한 가동물체형 파력발전장치의 개발과 전력생산에 관한 수리실험)

  • Hwang, Seong Su;Lee, Dong Soo;Yang, Kyong Uk;Byun, Jung Hwan;Park, Il Heum
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.28 no.2
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    • pp.73-80
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    • 2016
  • To reduce the mechanical energy loss and to get the high energy efficiency, an apparatus of wave power generation inducing a consistent one way rotating motion from the wave reciprocation motions was developed and the hydraulic experiments for the real electric power production were conducted and the results were discussed. In the experiments for the shape of the buoyant tank, the efficiency of the fixed 9 cm diameter type enduring the wave plate weight was 14.6% and this was the best result for all shapes. But although the free sliding type was expected to represent a high efficiency, the experiments did not show a good result as 8.5% efficiency. Therefore, the shape of buoyant tank was decided as the fixed 9 cm diameter type in the next all tests. In the experiments for the various incident waves, when the water depth was 90 cm, the average efficiencies were measured as 3.9% in the 2nd gear, 4.9% in the 3rd gear, 4.9% in the 4th gear, 12.0% in the 5th gear, 10.0% in the 6th gear, 3.1% in the 7th gear, and 3.0% in the 8th gear. Also, when the water depth was 80 cm, the average efficiency was shown as 15.0% with 5th gear condition. Therefore the high average efficiency as 13.5% was given with 80~90 cm water depth and the 5th gear in the model.

Design and Software Implementation of Noise Reduction Filter for Mid-wave Infrared Images (중적외선 영상 잡음 감소를 위한 SW 필터의 설계 및 구현)

  • Park, Hyunsung;Kim, Jungho;Lee, Sungho
    • Journal of the Korea Institute of Military Science and Technology
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    • v.19 no.4
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    • pp.500-507
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    • 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.

The Longitudinal Relationship Between Emotionality at Age Three and Media Overdependence in Early School Age: The Mediating Role of Internalizing Behavior Problems (3세 유아의 정서성 기질과 학령 초기 아동의 미디어 과몰입 간 종단적 관계: 내재화 문제행동의 매개역할)

  • Da Hye Kim;Yeon Ha Kim
    • Korean Journal of Childcare and Education
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    • v.20 no.1
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    • pp.39-53
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    • 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.

An Investigation of the Cumulative Effects of Depressive Symptoms on the Cognitive Function in Community-Dwelling Older Adults: Analysis of the Korean Longitudinal Study of Aging (지역사회 거주 노인의 우울 증상이 인지기능에 미치는 누적적인 영향에 관한 연구: 고령화연구패널조사 Korean Longitudinal Study of Aging 자료를 중심으로)

  • Kim, Eunmi;Oh, Jinkyung;Huh, Iksoo
    • Journal of Korean Academy of Nursing
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    • v.53 no.4
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    • pp.453-467
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    • 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.

MMB System and Channel Model for 5th Generation Mobile Communication (5세대 이동통신을 위한 MMB 시스템 및 채널 모델)

  • Moon, Sangmi;Kim, Bora;Malik, Saransh;Kim, Jihyung;Lee, Moon-Sik;Kim, Daejin;Hwang, Intae
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.8
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    • pp.3-10
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    • 2014
  • Millimeter wave (mmWave) has attracted great interest recently and the necessity of Millimeter Mobile Broadband (MMB) system has appeared based on the 4 Generation Long Term Evolution-Advanced (LTE-A) Specification. Currently, there are many studies about the mmWave communication channel. And it is subject of interest to analyze the performance in MMB channel environments. In this paper, we design the MMB system for 5th Generation mobile communication and propose channel models through the analysis of the mmWave propagation characteristics. Also, we have analyzed the performance of the MMB system of 28 GHz band in MMB channel environments.

Numerical Analysis of the Subscale Blast Door Deformation and the Subsequent Blast Wave Propagation through the Tunnel by the External Explosion (외부 폭발에 의한 축소형 방폭문 변형 및 터널 내부 폭풍파 전파 거동의 수치해석)

  • Yun, Kyung Jae;Yoo, Yo-Han
    • Journal of the Korea Institute of Military Science and Technology
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    • v.19 no.4
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    • pp.462-468
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    • 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.

Investigation of the Design Wave Forces for Ear-Do Ocean Research Station I: Three Dimensional Hydraulic Model Tests (이어도 종합해양과학기지에 대한 설계파력의 검토 I: 삼차원 수리모형실험)

  • 전인식;심재설;최성진
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.12 no.4
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    • pp.157-167
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    • 2000
  • Korea Ocean Research and Development Institute performed the basic design of the Ear-Do Ocean Research Station in 1998. The design wave was taken to be the deep water wave which was obtained through wave hindcasting procedure. Wave forces acting on the structure were calculated by Morison formula utilizing the stream function theory of 5th. order. In the present study, a three dimensional hydraulic model testing was undertaken to investigate the validity of the basic design, measuring wave propagation over the Ear-Do, horizontal wave forces and air gaps. The measured forces were all compared by the corresponding values calculated by SACS program based on th design on the design wave. The results showed that in the three deep water wave directions (SSW, S, SE) the measured wave farces appeared less than the SACS calculated. But in the NNW wave direction, the measured forces generally exceeded the calculated values and showed a peculiar pattern very similar to the case that waves are superimposed by an unidirectional current. It was also found that the measured air gap underneath the structure appeared less than the values taken in the basic design for all wave directions.

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Study on High Accurate Schemes for Simulation of Free-surface Flow (자유표면 유동 시뮬레이션을 위한 고정확도 수치도식의 검토)

  • Park, Jong-Chun;Lee, Byoung-Hyuk;Kim, Jeung-Hu
    • Journal of Ocean Engineering and Technology
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    • v.20 no.4 s.71
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    • pp.31-36
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    • 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.

Reciprocal Influences between Self-esteem and Academic Achievementamong Elementary School Students (초등학생의 자아존중감과 학업성취 간 통시적 상호영향)

  • Lee, Kyung-Eun;Lee, u-Lie
    • Journal of the Korean Home Economics Association
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    • v.47 no.1
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    • pp.65-73
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    • 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.