• 융합보안논문지
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• 제20권4호
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• pp.27-34
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• 2020

최근 4차 산업혁명 기술은 기술발전을 통해 일상생활을 크게 바꾸고 있을 뿐 아니라 국방정책 수립에 있어서도 주요 키워드가 되어 가고 있다. 특히 ICBMS라 불리는 사물인터넷, 클라우드, 빅데이터, 모바일, 사이버보안 기술은 인공지능과 더불어 국방정보화정책의 핵심선도기술로 선정되었다. 4차 산업혁명 기술의 중요성이 증대되는 가운데 현재 KJCCS, ATCIS, KNCCS, AFCCS 등 합참 및 각 군 기능별로 분리 운용되고 있는 C4I체계를 미래전에 대비하는 하나의 체계로 개발하기 위한 연구가 추진되고 있다. 이는 C4I체계를 각 도메인별로 운용함에 따라 정보교환 등 합동작전을 위한 상호운용성이 저하되는 문제를 해소하기 위함이다. 또한 각종 무기체계들이 초연결 및 초지능화 체계로 개발이 추진되고 있어 이들을 효율적으로 통제하고 안전하게 운용하기 위해 통합C4I체계 구축과 미군의 RMF(Risk Management Framework) 같은 체계의 도입이 필수적이다. 따라서 본 논문에서는 빅데이터/클라우드 기반의 미래 C4I체계의 사이버위협 지능화 탐지 및 사용자 정보 접근권한 관리, 사이버위협의 지능화 관리 및 가시화 방안을 제시한다.

• Journal of Ecology and Environment
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• 제48권3호
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• pp.296-307
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• 2024

Background: This study compares seed germination and seedling growth parameters of native Senegalia catechu with its closely related invasive Leucaena leucocephala in Nepal. For the comparison of seed germination percentage (GP), mean germination time (MGT), and Timson's index (TI), the seeds of both species were incubated under different light (photoperiod and dark), temperatures (30/20℃ and 25/15℃) and water stress conditions (-0.1, -0.25, -0.5, -0.75, and -1 MPa). The seedling emergence from different soil depths was also evaluated. The relative growth rate (RGR), root mass fraction (RMF), stem mass fraction, leaf mass fraction (LMF), and root-to-shoot ratio (RSR) of seedlings were also measured. Results: The seed length and mass of invasive L. leucocephala were higher than that of native S. catechu. The GP of S. catechu was higher at high temperature and photoperiod comparing to L. leucocephala. There was no difference in GP between two species under other light and temperature conditions. The MGT of S. catechu was shorter than that of L. leucocephala at both temperatures. Senegalia catechu exhibited higher TI than L. leucocephala, particularly at high temperatures. Water stress above -0.5 MPa reduced the GP and TI of both species and it was more pronounced in S. catechu than L. leucocephala. The seedling emergence percentage of L. leucocephala was higher than that of S. catechu. Both species exhibited comparable RGR and biomass allocations (RMF, LMF, and RSR). However, L. leucocephala had always greater values of shoot height, root length, leaf number and seedling biomass compared to S. catechu. Conclusions: Larger seeds may not always lead to higher seed GP. Some, but not all, seed germination and seedling growth traits can be useful to characterize invasive alien plant species. Invasiveness of L. leucocephala could be attributed to relatively high tolerance of seed germination to water stress, capacity to germinate from deeper soil, and larger seedling size compared to the confamilial native species.

• Journal of Computational Design and Engineering
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• 제2권1호
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• pp.67-72
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• 2015

Recently, along with the improvements of geometry modeling methods using sketch-based interface, there have been a lot of developments in research about generating surface model from 3D curves. However, surfacing a 3D curve network remains an ambiguous problem due to the lack of geometric information. In this paper, we propose a new algorithm for estimating the normal vectors of the 3D curves which accord closely with user intent. Bending energy is defined by utilizing RMF(Rotation-Minimizing Frame) of 3D curve, and we estimated this minimal energy frame as the one that accords design intent. The proposed algorithm is demonstrated with surface model creation of various curve networks. The algorithm of estimating geometric information in 3D curves which is proposed in this paper can be utilized to extract new information in the sketch-based modeling process. Also, a new framework of 3D modeling can be expected through the fusion between curve network and surface creating algorithm.

• 한국토양비료학회지
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• 제48권3호
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• pp.189-193
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• 2015

Bad drainage problems from paddy fields adjacent to roads are caused by higher constructed roads which change topography of paddy fields to concave topography and artificial pan to prevent road erosion when road constructions are occurred. This study investigated effects of topography changes on soils by road constructions. Soil samples were investigated by physico-chemical analyses and micromorphology analyses from representative soil profile of Sachon series and soil samples. The characteristics of Sachon series that were adjacent to roads were fewer redoximorphic features (RMF) and increase in grey layers than the original Sachon series. The characteristics of Yecheon Series were shown from Jeollanamdo - Suncheon > Chungchungnamdo - Cheonan > Gangwondo - Wonju. Mosaic speckles were shown from micromorphological analyses because of repeat of shrink and expansion by wetting and drying. The location of graying in soil clods were found from coarse stone blocks to fine stone blocks and color changes of composed particles were also found.

• 한국운동역학회지
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• 제24권1호
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• pp.19-26
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• 2014

This study investigated foot pressure patterns between experienced skiers and intermediate skiers during alpine skiing. Five experienced skiers and five intermediate skiers participated in this study. Foot pressure measurement system was used to measure vertical ground reaction force (vGRF) and contact area under the six plantar regions. Each participant was asked to perform basic parallel turns and carved turns on a $18^{\circ}$ groomed slope. Each right turn was divided into the initiation phase, the steering phase 1 and 2. For the initiation phase of the basic parallel turns, significantly greater contact area was found on the LRF and RRF of the intermediate skiers (p<.05) and significantly greater vGRF was found on the LRF of the intermediate skiers (p<.05). Also significantly greater vGRF and contact area were found on the LRF and RRF of the intermediate skiers at the steering phase 1 (p<.05) and on the LRF of the intermediate skiers at the steering phase 2 (p<.05). For the carved turns, significantly greater vGRF and contact area were found on the LRF and RRF of the intermediate skiers at all three phase (p<.05). On the other hand, significantly greater vGRF was found on the RFF of the experienced skiers at the steering phase 1 (p<.05). Also significantly greater vGRF and contact area were found on the RMF of the experienced skiers at the steering phase 2 (p<.05). In order to increase performance, we suggest that the intermediate skiers should be unweighted at the initiation phase and shift the body weight to the forefoot of the outer foot at the steering phase 1. Also, the outer ski should be loaded more than the both skis at the steering phase 1 and 2.

• 대한기계학회논문집B
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• 제34권11호
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• pp.991-998
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• 2010

소듐냉각 고속로 내부기기 배치 변경에 의한 초기냉각 성능변화를 검토하기 위하여 중간열교환기의 수직배치가 다른 3개의 원자로를 대상으로 COMMIX-1AR/P 코드를 활용한 다차원 해석을 수행하였다. 원통좌표계의 중심축을 기준으로 원주방향의 1/4 부분만을 모델링하고 정상상태 및 과도상태 분석을 수행하여 IHX 수직배치 변화가 초기 냉각 특성에 미치는 영향을 분석하였고, DHX를 통한 후기 냉각 모드 개시 시점에 미치는 영향도 분석하였다. 분석 결과 IHX 수직배치 상승은 원자로 풀내부 자연 순환 유량을 증가시켜 초기 냉각과정에서 노심 최고 온도의 급격한 상승을 방지할 수 있으며, 초기냉각 성능을 향상시키기 위한 관성회전차의 가용설계재원의 범위도 확대시킨다. 또한 IHX 수직배치 상승은 후기냉각모드에 큰 영향을 주지 않으면서 초기냉각성능의 향상에 기여할 수 있을 것으로 사료된다.

• 정보보호학회논문지
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• 제22권5호
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• pp.1123-1132
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• 2012

최근에는 정보보호 및 개인정보보호 관련 컴플라이언스 요구에 의한 정보보호 관리체계는 선택의 문제가 아니라 필수 문제로 부각되고 있다. 이러한 맥락에서 정보보호 관리체계 운용과 관리과정이 현실적 상황에서 얼마나 도움이 되고, 실효성 있는지를 실증적으로 검증하기 위해 측정 항목을 설정하고, 실제 보안전문가인 조직의 정보보호 관리체계 운영 담당자를 대상으로 설문조사를 실시하였고 이를 통해 신뢰성 및 타당성 분석을 실시하였다. 본 논문에서는 정보보호 관리과정이 정보보호 성과에 미치는 영향에 대해 알아보기 위해 확증적차원(confirmatory)에서 구조방정식에 사용되는 PLS(Partial Least Square, SmartPLS 2.0)를 이용한 1차 요인분석과 마지막으로 2차 요인분석을 하였다. 연구 결과 연구 모형에 대한 가설 검정 결과 총 16개중 채택 8개, 기각8개로 나타났으며, 정보보호 관리체계 관리과정이 대부분 정보보호 성과에 영향을 미치나 계획단계, 실행단계, 점검단계가 직접적인 영향을 미치는 것으로 나타났다.