• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.98-98
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• 2018

최근 기후변화로 인해 대류성 집중호우가 빈번하게 발생하고 있으며 이러한 강우 특성은 산지 지역에 위치한 소하천유역에 상당한 피해를 야기한다. 통상 대류성 집중호우는 규모가 작고 속도가 빠르기 때문에 중규모 이상의 유역에서 부분적으로 상이한 강우특성을 보인다. 아울러 이러한 호우 패턴의 변화는 일시적인 현상이 아닌 하나의 기상 특성으로 자리를 잡아가고 있기 때문에 이에 대한 대책마련이 더욱 필요한 실정이다. 초단기예보 모형은 돌발홍수 예경보시스템의 입력 값인 예측강우 자료를 생산한다. 시스템에 입력되는 예측강우 자료는 두 가지의 문제점을 가지게 된다. 첫 번째는 예측강우 자료 자체가 가지는 정확도의 문제이다. 이를 해결하기 위해 우리나라에서는 G/R비 개념을 도입하여 예측강우의 품질을 개선하고 있다. 두 번째 문제는 호우사상의 크기에 대한 것이다. 현재 돌발홍수 예경보시스템의 예측강우 보정기법은 호우의 거동 특성을 고려하지 않으며, 이로 인해 예측강우의 편의보정계수인 G/R비가 적절하지 않게 결정되는 문제가 발생한다. 본 연구에서는 이러한 문제점을 극복하기 위해 현재의 예측강우 보정기법과는 달리 호우의 이동경로를 고려하여 G/R비를 결정하고 이를 예측강우에 적용하는 방법을 제시하였다. 현재 호우가 위치하는 지역에 대해 G/R비를 산정하고 몇 시간 내에 대상지역에 도달하게 될 호우에 대한 예측 강우에 적용하였다. 본 연구에서는 2016년에 발생한 주요 호우사상을 선정하고, 우리나라 전역에 걸쳐 개선된 보정기법 방법론을 적용하였다. 그 결과 현재의 보정방법을 적용하는 경우 비정상적으로 과대하게 보정된 결과를 주는 데 반해, 호우의 이동경로를 고려한 보정방법을 적용한 경우에서는 실제 관측된 강우와 매우 유사한 합리적인 보정치를 제공해 주는 것으로 확인되었다.

• Journal of the Korea Convergence Society
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• v.10 no.11
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• pp.437-444
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• 2019

The purpose of this study is to stereotype the subjective perception of multicultural societies of university students and to identify the characteristics and differences by types. To this end, the Q methodology was utilized and 31 college students were selected. According to the analysis, there were four types of university students' perception on multicultural societies. Type 1 was an 'aggressive acceptance' which aggressively and positively embraces multicultures. Type 2 was a 'its national first priority', which put the Korean first before immigrants. Type 3 was 'reasonable acceptance' that accepts multiculturalism within the reasonable and legal bounds. Type 4 was 'limited permission' which agrees to accept immigrants restrictively. Based on the results of this study, thought-provoking ways needed to realize multicultural societies were explored.

• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.6
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• pp.218-225
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• 2021

The purpose of this study is to present a rational analytical method for predicting the behavioral characteristics from crack occurrence to fracture for a one-way CFRP grid reinforced concrete slab specimen. A total of four specimens were selected by Zhang et al.(2004) as the main experimental variables for CFRP grid amount, material properties and loading method. Analysis was performed through the Nonlinear Finite Element analysis program(RCAHEST), which applied the newly modified constitutive relational equations by the author. The mean and coefficient of variation for maximum moment from the experiment and analysis results was predicted 1.38 and 7 %. The mean and coefficient of variation for displacement corresponding maximum moment from the experiment and analysis results was predicted 1.41and 9.8 %. The prediction results for the behavioral characteristics from crack occurrence to fracture were verified and evaluated. It is judged that additional research is needed to secure various experimental results and to develop a more reliable analytical method.

• Journal of the Korea Society for Simulation
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• v.27 no.4
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• pp.9-18
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• 2018

This paper proposes new algorithms of accessibility indices to analyze the connectivity of the Korean highway network. First of all, we find a transportation network that presents Korea's highway network in graphs in 2011 and 2017. And we analyze and compare the nation's highway network in 2011 and 2017 using concepts such as associated number, the relative distance, the accessibility, the degree of connectivity, the index of dispersion, the diameter of graph theory. To do this, an algorithm is presented which can easily obtain various accessibility indices from a given transportation network. Using the simulation results of this study, we can find city that is the center of traffic in the highway transportation network. In addition, cities that are included in the network but are relatively underdeveloped can be found and used as basic data for enhancing the connectivity of the nationwide traffic in the future. Moreover, the proposed algorithms of accessibility indices, which are modeled on highway transport networks, can help identify the accessibility space structure of each city and provide criteria for efficient and reasonable selection of alternatives in various regional planning processes, including transportation.

• Journal of Technologic Dentistry
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• v.40 no.4
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• pp.273-281
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• 2018

목적: 본 연구는 실무 현장과 교육 현장의 조사를 통한 종합적인 의견을 수렴하여 합리적인 치과기공사 양성 및 배출을 위한 개선안을 도출하고자 한다. 방법: 3회에 걸쳐 설문조사가 진행되었으며, 1차는 개방형 문항으로 조사되었고, 2차, 3차는 폐쇄형 문항으로 조사되었다. 델파이 조사를 위한 조사 인원 선정을 100명(정책집단: 20명, 교육집단: 20명, 임상가 집단: 60명)으로 지정하였다. 1차 개방형 조사결과를 토대로 2차 설문문항을 작성하였으며, 2차 설문조사 결과를 토대로 3차 설문문항을 작성 후 조사하였다. 수집된 자료의 분석은 통계패키지 프로그램 SPSS Ver. 21.0를 활용하여 델파이 기법(Delphi Method)을 활용한 연구 결과에서 전문가 집단의 의견을 수렴하기 위해 빈도분석과 기술통계분석을 실시하였다. 결과: 현 교육체계의 문제점은 임상현장과의 차이와 실무능력저하, 국가시험위주의 교육이 문제점으로 대두되었으며, 현행 평가제도의 문제점은 임상현장을 충분히 반영하지 못한 점, 실무능력이 미 반영된 실기평가로 지적되었다. 결론: 결론적으로 치과기공사의 교육과정과 평가제도는 현실적인 내용을 고려하면서 임상 실무와의 연계성을 높이는 방향으로 개선되어야 할 것으로 사료된다.

• Journal of Digital Convergence
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• v.18 no.12
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• pp.577-583
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• 2020

The learning and cognition of preschool children begins with the color of the object, and the game interface is the child's first impression of the game, so reasonable color design is needed. This article selects 10 educational mobile game for preschool children, extracts colors from the game interface and startup icons, and puts them into Photoshop to analyze the three elements of color hue, lightness, and saturation. Finally, three suggestions are put forward for the color design of game UI. 1.Choose a color similar to the actual color of the thing. 2. Choose warm colors according to your child's preferences. 3. When using contrasting colors, please reduce the brightness or purity of the colors. It is hoped that the research conclusions can provide reference materials for the color design of educational game UI for preschool children.

• Korean Journal of Construction Engineering and Management
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• v.23 no.1
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• pp.89-97
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• 2022

Recently, various problems such as reduced productivity, insufficient inflow of skilled manpower, reduced quality, and concerns about increasing safety accidents have appeared in the domestic construction industry. Stakeholder of construction project are considering the Off-Site Construction (OSC) method rather than the conventional on-site construction as an alternative. Despite the importance of decision making in the early stage of the adoption of OSC, there is a lack of methodologies for rational decision making. In this study, a decision making system has been developed to derive the final construction cost score by deriving the project characteristics, selecting the construction difficulty index, and developing a cost model for each construction method alternatives to calculate the standard construction cost. Using this system, the OSC method can be effectively evaluated in terms of its feasibility in the early stage of construction

• Journal of the Korea institute for structural maintenance and inspection
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• v.26 no.5
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• pp.74-85
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• 2022

The purpose of this paper is to review the applicability of the current standards for the evaluation method of input variables and performance level in seismic performance evaluation by dynamic plastic analysis of the concrete gravity-type dam to which MCE is applied, and to suggest improvements. To this end, a domestic concrete gravity-type dam was selected as a target facility, dynamic plasticity analysis was performed under various conditions, and applicability to input variables such as concrete tensile strength and breaking energy, was reviewed. By analyzing the effect of cracks at the bottom of the gravity dam on the stability of the activity, an improvement plan for the performance level evaluation method required to secure the water storage function was derived. If the proposed improvement plan is applied, it will have the effect of deriving more reasonable evaluation results than the current seismic performance evaluation method to which MCE is applied.

• Journal of the Korean Geotechnical Society
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• v.25 no.11
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• pp.87-103
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• 2009

To determine the reliable probabilistic distribution model of geotechnical properties, outlier and randomness test for analysis data, parameter estimation of probabilistic distribution model, and goodness-of-fit test for model parameter and probabilistic distribution model have to be performed in sequence. In this paper, the probabilistic distribution model's geotechnical properties of Songdo area in Incheon are estimated by the above proposed procedure. Also, the coefficient of variation (COV) representing the variability of geotechnical properties is determined for several geotechnical properties. Reliable probabilistic distribution model and COV of geotechnical properties can be used for probability-based design procedure and reasonable choice of design value in deterministic design method.

• Journal of the Korean Geotechnical Society
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• v.25 no.5
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• pp.39-46
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• 2009

In this study, behavior of a rigid continuous wall, earth pressure distribution with construction stage, and axial force of earth anchors were evaluated based on field monitoring data and numerical analysis results. For this purpose, a construction site excavated using the diaphragm wall was selected and full instrumentation system was introduced. From monitoring results, it was found that the values of horizontal displacement of the wall measured from the inclinometers, which were installed within the diaphragm wall were similar to analytical value. The earth pressure increased with excavation progress due to jacking force of the ground anchors installed in previous excavation stages. When the excavation depth reached 60% of the final depth, observed earth pressure distribution was similar to that estimated from Peck's apparent earth pressure distribution. When the excavation depth was around 90% of the final depth, values of observed earth pressure showed middle values between those of Peck's and Tschebotarioffs apparent earth pressures. It was also observed that, when excavation depth is deep, values of the earth pressures from the rigid wall were similar to those estimated from conventional earth pressure distribution shape proposed for flexible walls.