• Proceedings of the Korea Water Resources Association Conference
• /
• 2008.05a
• /
• pp.1259-1263
• /
• 2008

인천청라 경제자유구역내의 중앙호수공원을 대상으로 100년빈도 홍수시 Off-Line저류지로써 횡월류부에 가동보 설치에 따른 공촌천 홍수조절효과를 분석하였다. 서해조위 및 배수갑문 운영 등의 다양한 변수를 고려해야 하는 본 하천의 특성상 흐름상태의 시 공간적 변화를 고려하고 Off-Line 저류지 해석에 있어 실제 지형을 충분히 반영할수 있는 HEC-RAS 부정류 해석을 수행하였다. 부정류 모의 시 가동보의 도복을 합리적으로 검토 하기 위해 도복발생 시간을 기준으로 2단계에 걸쳐 부정류 모의를 수행하였다. 즉, 1단계에서 호수공원 횡월류 Weir높이를 가동보 높이로 고정하고 부정류 모의를 수행하여 공촌천의 호수공원 횡월류부 지점의 수위가 가동보 높이와 같아지는 시간을 찾고, 2단계에서 그 시간을 기준으로 호수공원 횡월류 Weir높이를 가동보가 없을 때의 높이로 부정류 모의를 수행하여 공촌천의 내수위를 검토하였으며, 가동보가 설치되지 않았을 때의 결과와 비교하여 가동보 설치에 따른 홍수조절효과를 분석하였다. 본 연구방법에서 검토된 공촌천 내수위의 적정성을 검토하기 위하여 배수갑문 운영에 따른 수위 변화를 모의 할 수 있는 Gate 모형으로 공촌천 하류의 배수갑문 지점에 대한 내수위를 산정하였으며, 하천 상류구간의 배수영향을 HEC-RAS를 이용한 부등류 모의를 추가적으로 수행하여 본 연구방법의 결과와 비교 검토하였다. 공촌천의 내수위 비교를 통한 홍수조절효과 분석결과 $2{\sim}3cm$ 정도의 홍수조절 효과가 있는 것으로 분석되었으며, 본 연구에서 제안한 방법이 가동보 설치에 따른 홍수조절효과분석 시 적용이 가능하리라 판단된다.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.23 no.1
• /
• pp.7-11
• /
• 2013

Taking experts' knowledge to recommend items has shown some promising results in recommender system research. In order to improve the performance of the existing recommendation algorithms, previous researches on expert-based recommender systems have exploited the knowledge of a common expert group for all users. In this paper, we study a problem of identifying personalized experts within a user group, assuming each user needs different kinds and levels of expert help. To demonstrate this idea, we present a framework for using Support Vector Machine (SVM) to find varying expert groups for users; it is shown in an experiment that the proposed SVM approach can identify personalized experts, and that the person-alized expert-based collaborative filtering (CF) can yield better results than k-Nearest Neighbor (kNN) algorithm.

• Spatial Information Research
• /
• v.10 no.1
• /
• pp.139-152
• /
• 2002

The purpose of this study is to estimate temporal soil loss change according to long-term land cover changes using G1S and RS. Revised USLE(Universal Soil Loss Equation) factors were prepared by using point rainfall data, DEM(Digital Elevation Model), soil map and land cover map. During the past two decades, land cover changes were traced by using Landsat MSS and TM data. As a result, forest area in 2000 has decreased 25.3 $km^2$ compared with that in 1990. Soil loss has decreased 3751.2 tou/yr. On the other hand, upland area has increased 22.5 $km^2$. Soil loss of upland has increased 5395.4 to/yr. Therefore, soil loss in 2000 increased 6.3 kg/$m^2$/yr compared with that in 1990. This was mainly caused by the increased upland area.

• Journal of Korean Society for Geospatial Information Science
• /
• v.10 no.4 s.22
• /
• pp.69-76
• /
• 2002

Nowadays information is very important for Civil Engineering. This information is acquiredmostly via Surveying & Geo-spatial Information System. Also this information is close to the ITS(Intelligent Transformation System), Navigation, Facility Management, and Digital Mapping, etc and applicable to versatile fields from now on. And in surveying fields, GPS satellites are introduced newly and play a great rules. In this study, RTK(Real-Time Kinematic GPS), one of the positioning technology with GPS satellites, is used for the production of Plane Figure of Campus. The results shows that it is possible to extract the information for some part of a flowerbed and road, but not so for the buildings surrounded. Therefore this give occasion to the a lowering of work effectiveness over the total work-flow. So at such a time, it will be expected that the supplementary systems such TS(Total Station), Plane-table, and theodolite, etc have to be used.

• Tunnel and Underground Space
• /
• v.27 no.2
• /
• pp.77-88
• /
• 2017

The geology of the study area is composed mainly of conglomerate, sandstone, and shale and basalt. It is a rock that has been observed to move relatively recently through various brittle deformation and various stress fields during the recent period. To form a gentle terrain with severe crushing. The slope is located at the intersection of the Taegok Fault in the north-northeast direction and the Bukok Fault in the western north-west direction, and many faults, fault zones and fracture zones of various sizes are developed in the rock bed. In this study, the geological characteristics of the slope are investigated and the countermeasure method is suggested. It is suggested that periodical measurement and analysis should be performed by installing a measuring instrument according to each structure for safety management of the surrounding roads and grounds during construction or reinforcement by the countermeasure method for the slope of the study area.

• Journal of Korean Society on Water Environment
• /
• v.22 no.4
• /
• pp.632-638
• /
• 2006

There are numerous approaches available to cleanup a contaminated surface and subsurface ground currently in use, however, these methods all classify the decontamination after the contamination has penetrated into the soil masses and is costly. Unlike these approaches, in this study, utilization of soil's self-decontamination ability by rearranging and preplanning of the topographical features and surface and subsurface drainage systems for the potential contamination sites before or during contamination process has been considered as an another cleanup method. Step by step explanations on why and how to develop the self-decontamination procedure is proposed in detail. Two examples are presented including contaminated saltwater intrusion along a coastal region and control or prevention of radioactive toxic radon gas ($^{222}Rn$) in residential areas. The effectiveness of the proposed systems to these two examples using the soil's self-decontamination ability is well illustrated.

• Journal of the Korean Data and Information Science Society
• /
• v.28 no.6
• /
• pp.1279-1290
• /
• 2017

R's {shiny} package provides an environment for creating web applications with only R scripts. Shiny does not require knowledge of a separate web programming language and its development is very easy and straightforward. In addition, Shiny has a variety of extensibility, and its functions are expanding day by day. Therefore, the presentation of high-quality results is an excellent tool for R-based analysts. In this paper, we present actual cases of large data analysis using Shiny. First, geological anomaly zone is extracted by analyzing topographical data expressed in the form of contour lines by analysis related to spatial data. Next, we will construct a model to predict major diseases by 16 cities and provinces nationwide using weather, environment, and social media information. In this process, we want to show that Shiny is very effective for data visualization and analysis.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2011.05a
• /
• pp.461-461
• /
• 2011

강수, 수위 및 유량자료 등의 수문자료는 안정된 물 관리 계획, 홍수조절 및 공급계획, 전력공급 등을 위한 댐의 역할을 원활하게 하기위한 운영의사결정을 위한 매우 중요한 기초자료가 된다. 댐 운영을 위한 다양한 기능을 가진 모델을 가지고 있다고 하더라도 매년 변하고 있는 댐 유역의 수문현상에 대한 관측자료를 이용하여 지속적으로 모델을 보정하여 정확성을 확인하고 향상시키는 노력을 기울여야 하므로 수문자료는 댐 운영에 있어서 필수적인 요소일 수밖에 없다. 본 연구에서는 한국수력원자력(주)의 9개 댐 유역에서 기존 활용 가능한 관측소 현황 및 현장조사를 통해 운영상 목적에 맞는 최적의 수위관측망을 설계하여 제시하였다. 설계 방법으로는 댐 유입량 파악과 개략적인 도달시간 파악을 위해 주요 유입지천인 국가하천과 지류 중 지방하천이라도 유역면적이 $150\;km^2$ 이상인 경우에는 유입량 파악을 위한 수위관측소를 두도록 설계하였다. 관측소 밀도는 각 댐 유역의 수문학적 유역 특성인 유역면적, 유입하천의 지형적 특성, 하천크기 등을 고려하여 결정하였다. 설계된 수위관측소들은 현장의 수위관측 및 유량관측에 대한 적정성을 검토하여 댐 저류지 배수영향 등으로 인해 관측이 부적정할 경우 이설을 통해 적정한 위치에서 수문조사가 이루어지도록 제안하였다. 본 연구에서 제안된 한국수력원자력(주) 관할 댐 유역의 수위관측망은 자체 관할 수위관측소 뿐 아니라 자료의 공동 활용이 가능한 국토해양부 등의 관측소까지 포함하고 있다. 따라서 댐 운영 의사결정을 위한 중요한 기초자료로서의 수위 및 유량자료를 경제적이고 효율적으로 제공할 수 있을 것으로 기대된다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.12
• /
• pp.758-764
• /
• 2019

The chassis of the Korean light tactical vehicle adopts a frame-on-body structure that uses lightweight design technology in terms of equipment operating characteristics. Military vehicles are operated in much harsher conditions compared to civilian vehicles, including mountainous terrain, especially steep slopes. Due to this characteristic, frame-welded cracks were found on some military vehicles. Therefore, in this paper, road damage analysis was conducted by identifying various roads including the military unit's road. The result confirmed that the operating environment of some military units' tactical road was much harsher than the endurance road test condition. A solution was derived through defect analysis, design review, and actual vehicle driving test. This study can be used as a reference by suggesting the development direction for the durability test of a new vehicle.

• Journal of Korean Society for Geospatial Information Science
• /
• v.13 no.1 s.31
• /
• pp.19-25
• /
• 2005

Nowadays, it is possible to construct the DEMs of urban area effectively and economically by LiDAR system. But the data from LiDAR system has form of DSM which is included various objects as trees and buildings. So the preprocess is necessary to extract the DEMs from LiDAR DSMs for particular purpose as effects analysis of man-made objects for flood prediction. As this study is for extracting DEM from LiDAR DSM of urban area, we detected the edges of various objects using edge detecting algorithm of image process. And, we tried mean value filtering, median value filtering and minimum value filtering or detected edges instead of interpolation method which is used in the previous study and could be modified the source data. it could minimize the modification of source data, and the extracting process of DEMs from DSMs could be simplified and automated.