• 대한건축학회논문집:계획계
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• 제34권11호
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• pp.23-32
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• 2018

The purpose of this study is to establish a walking energy weighted ERAM model that can predict the pedestrian volume by the connection structure of the vertical and horizontal spaces within a three-dimensional building. The process of building a walking-energy weighted ERAM model is as follows. First, the spatial graph was used to reproduce three-dimensional buildings with vertical and horizontal spatial connection structures. Second, the walking energy was measured on the spatial graph. Third, ERAM model was used to apply weights with spatial connection properties in random walking environment, and the walking energy weights were applied to the ERAM model to calculate the walk energy weighted ERAM values and visualize the distribution of pedestrian flow. To verify the validation of the established model, existing and proposed spatial analysis models were compared to real space. The results of this study are as follows : The model proposed in this study showed as much elaborated estimation of pedestrian traffic flow in real space as in traditional spatial analysis models, and also it showed much higher level of forecasting pedestrian traffic flow in real space than existing models.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2003년도 공동 춘계학술대회 논문집
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• pp.65-70
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• 2003

The weight-of-evidence model one of the Bayesian probability model was applied to the task of evaluating landslide susceptibility using GIS. Using the location of the landslides and spatial database such as topography, soil, forest, geology, land use and lineament, the weight-of-evidence model was applied to calculate each factor's rating at Boun area in Korea where suffered substantial landslide damage fellowing heavy rain in 1998, The factors are slope, aspect and curvature from the topographic database, soil texture, soil material, soil drainage, soil effective thickness, and topographic type from the soil database, forest type, timber diameter, timber age and forest density from the forest map, lithology from the geological database, land use from Landsat TM satellite image and lineament from IRS satellite image. Tests of conditional independence were performed for the selection of the factors, allowing the 43 combinations of factors to be analyzed. For the analysis, the contrast value, W$\^$＋/and W$\^$-/, as each factor's rating, were overlaid to map laudslide susceptibility. The results of the analysis were validated using the observed landslide locations, and among the combinations, the combination of slope, curvature, topographic, timber diameter, geology and lineament show the best results. The results can be used for hazard prevention and planning land use and construction

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2002년도 추계공동학술대회논문집
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• pp.169-174
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• 2002

방향구속 전력최소화법(Directionally Constrained Minimization of Power : DCMP)과 제로포싱방법(Zero Forcing : ZF)은 어레이 안테나에 수신된 신호들로부터 채널응답 백터인 Spatial Signature를 추정하고, 이를 이용하여 최적웨이트(Optimal Weight)를 결정함으로써 어레이 출력SINR(Signal to Interference plus Noise Ratio)을 향상시킬 수 있는 알고리즘들로 알려져 있다. 본 논문에서는 이 동국 주변에서 다중산란된 수신신호들이 어레이 안테나에 수신되는 환경에서 DCMP와 ZF방법의 성능을 분석하였다. 이를 위하여 ESPRIT를 이용하여 수신신호들의 도래각(Direction of Arrival: DOA)과 확산각도(Angular Spread: AS)를 추정하여 Spatial Signature를 구한 후, 그 결과치를 이용하여 DCMP와 ZF방법으로 어레이 출력신호를 합성하였다. 모의 실험을 통하여 어레이 출력 SINR 성능을 평가하고 이론저거 성능결과와 비교하였다.

• 한국공간구조학회:학술대회논문집
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• 한국공간구조학회 2008년도 춘계 학술발표회 논문집
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• pp.61-65
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• 2008

A 4-story reinforced concrete structure built above an underground parking garage shows some slab deflections, and the deflections of the concrete floor slabs are proposed to be alleviated by the application of light-weight topping material in conjunction with localized strengthening of the slabs. The application of light-weight concrete topping on the existing slab has been simulated and its performance to anticipated loads has been analyzed. The application of light-weight topping material imposes additional weight on the exiting floor slabs. This added weight on the existing slabs causes over-stressing of the slabs. This over-stressing can be alleviated by enhancing the load carrying capacity of the existing slabs. Additional load carrying capacity in the existing slabs can be developed by localized strengthening of the slabs utilizing techniques such as the application of fiber-reinforced composites on the bottom surface of the slabs, and application of fiber-reinforced composites adequately complements the capacity of the existing slabs to bear the additional load imposed by light-weight leveling material. Additional moments in the beam and columns induced by the application of the light-weight topping material were tabulated and compared with capacity. The moment D/C ratios of the beam and columns are well the range of acceptable limits, and the beam and columns are not overstressed by the application of the surcharge.

• Journal of Korea Trade
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• 제25권3호
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• pp.116-133
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• 2021

Purpose - Intra-industry trade of agricultural products can eliminate the disadvantage of Korea's traditional agriculture and improve its lack of comparative advantage. The main purpose of this paper is to measure the level and index of intra-industry trade of Korean agricultural products and to explore the spatial dependence and spillover effect associated with this type of trade. The main factors influencing intra-agricultural trade are analyzed from two perspectives: the population and the classification of agricultural products. Design/methodology - First, the level of intra-industry trade of Korean agricultural products is measured. Second, to obtain a more accurate estimate of the influence of various factors, and based on two types of weight matrices, a spatial econometric model is constructed from two aspects: population and classification of agricultural products. The status and the factors influencing intra-industry trade are also studied. Findings - It is concluded that there is a positive spatial correlation between Korea's intra-industry trade in agricultural products and that of its trading partners. The spatial spillover effect of this type of trade is verified by using the spatial autoregressive model (SAR). Labor-intensive agricultural products are found to have a positive spillover effect on intra-industry trade, while land-intensive products do not have a significant effect. Originality/value - In this paper, the two types of agricultural products are meticulously distinguished, and the spatial effect of the intra-industry trade of agricultural products as well as the influence of various factors are analyzed. In addition, the accuracy of the estimation of the coefficients of the factors by using the spatial econometric model is higher than that of the ordinary panel data model.

• 한국공간구조학회논문집
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• 제5권2호
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• pp.81-87
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• 2005

The Space structures may have large freedom in scale and form. And especially Hybrid structures are received much attention from the view points of their light weight and aesthetics. Hybrid systems are stable structures which are reticulated spatial structures composed of compressive straight members, struts and cables and Membranes. In this paper, The Hybrid Unit System are suggested using the Membrane and Cable elements based on the Tensegrity Unit system. Also, The Hybrid System of double-layered single curvature is presented. We analyze the force density method allowing form-finding for Tensegrity systems. And We analyze the shape analysis by the LARSH which is the program for nonlinear analysis.

• 한국통신학회논문지
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• 제10권2호
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• pp.93-103
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• 1985

대역폭 압축에 의한 디지털 신호처리 기술은 최근 몇 년동안 집적회로 기술의 발달에 따라 급성장해왔다. 본 연구에서는 화면의 중앙에 시야가 돋보이며 눈의 감각과 일치하는 Hadamard Matrix의 중앙에 Weight를 준 Nonorthogonal 변환인 Weighted Handamard Matrix를 구하여 실시간처리를 위한 고속계산방법과 Hardware system을 연구하였다. 따라서 본 연구는 항공사진, X-Ray, CATV, 인공위성통신 등 디지탈영상신호처리에 사용할 수 있을 것이다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.430-433
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• 2005

In this study, weight of evidence(WOE) technique based on the bayesian method was applied to estimate the groundwater yield characteristics in the Pocheon area in Kyungki-do. The ground water preservation depends on many hydrogeologic factors that include hydrologic data, landuse data, topographic data, geological map and other natural materials, even with man-made things. All these data can be digitally collected and managed by GIS database. In the applied technique of WOE, The prior probabilities were estimated as the factors that affect the yield on lineament, geology, drainage pattern or river system density, landuse and soil. We calculated the value of the Weight W+, W- of each factor and estimated the contrast value of it. Results by the ground water yield characteristic calculations were presented in the form of posterior probability map to the consideration of in-situ samples. It is concluded that this technique is regarded as one of the effective technique for the feasibility mapping related to detection of groundwater bearing zones and its spatial pattern.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.303-303
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• 2000

It is difficult to determine the static axle weight of a vehicle with weigh-in-motion systems which in absence measure instantaneous axle impact forces. The difficulty in determining a static axle weight results from dynamic effects induced by vehicle/road interactions. One method to improve the problem is to quantify a statistical confidence level for measured axle weight. The quarter-car model is used to simulate vehicle motion, Also, the road input to vehicle model can be characterized in statistical terms by PSD (power spectral density) of appropriate amplitude and frequency contents other than an exact spatial distribution. The confidence levels for the measured axle weight can be obtained by the random process analysis using both vehicle model and road input.

• 대한원격탐사학회지
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• 제35권2호
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• pp.299-316
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• 2019

본 연구는 지리정보시스템(GIS) 환경에서 확률 모델인 Weight Of Evidence (WOE)와 Evidential Belief Function (EBF), 기계학습 모델인 Artificial Neural Networks (ANN) 모델을 이용하여 평창지역의 산사태 취약성도를 공간적으로 분석하고 예측하였다. 본 연구지역은 2006년 태풍 에위니아에 의한 집중호우로 산사태가 많이 발생하여 많은 재산 및 인명피해가 발생하였다. 산사태 취약성도를 작성하기 위해 항공사진을 이용하여 3,955개의 방대한 산사태 발생 위치를 탐지하였고, 환경공간정보인 지형, 지질, 토양, 산림 및 토지이용 등의 공간 데이터를 수집하여 공간데이터베이스에 구축하였다. 이러한 공간데이터베이스를 이용하여 산사태에 영향을 줄 수 있는 인자 17개를 추출하여 입력 인자와 EBF, WOE, ANN 모델을 이용하여 산사태 취약성도를 작성하고 검증하였다. 작성 및 검증을 위해 산사태 자료는 각각 50%씩 나누어서 훈련 및 검증을 실시하였고, 검증결과 WOE 모델의 경우는 74.73%, EBF 모델의 경우는 75.03%, ANN 모델의 경우는 70.87%의 예측 정확도를 나타내었다. 본 연구에 사용된 모델 중 EBF 모델이 가장 높은 정확도를 나타냈으며, 모든 모델에서 70% 이상의 예측 정확도를 보여 본 연구에서 사용된 기법이 산사태 취약성도 작성에 유효함을 나타내었다. 본 연구에서 제안된 WOE, EBF, ANN 모델과 산사태 취약성도는 이전에 산사태가 발생하지 않은 지역의 산사태를 예측하는 데 사용될 수 있다. 이러한 취약성도는 산사태 위험 감소를 촉진하고, 토지 이용 정책 및 개발을 위한 기초자료 역할을 할 수 있으며, 궁극적으로 산사태 재해 예방을 위한 시간과 비용을 절약할 수 있다. 향후 보다 많은 지역에서 산사태 취약성도 작성 방법을 적용하여 산사태 위험 예측을 위한 일반화된 모델을 이끌어 내야 한다.