• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.265-269
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• 2011

낙동강 수계 내 하천 환경 및 수자원에 대한 효율적인 유역관리를 위해 수계 내 비점오염원의 유출 및 오염물질 발생특성에 대한 정량적인 분석이 요구된다. 점오염원과 달리 강우뿐만 아니라 유역 내 지표상태 등 복잡하고 예측 곤란한 상황을 반영해야 하므로 정량화에 어려움이 따르게 된다. 수문학적 및 수리학적 분석이 가능할 뿐 아니라 수질모의가 가능한 SWMM을 활용하고 오염총량 단위유역과 댐유역을 고려한 소유역 분할을 적용함으로써 댐유역을 제외한 오염총량 단위유역별 비점오염원 분석결과를 산정하였다. 본 연구에서 산정된 유량을 기초로 낙본I 지점과 진동 수위표의 유황곡선을 비교하고 낙본I 지점의 월별 유출량 및 오염부하량 분석과 함께 유출량과 수질항목별 오염부하량의 상관관계를 분석하였다. 또한, 낙동강 수계 내 점오염원을 배제한 단위유역별 및 낙본I 지점의 비점오염원 발생특성을 분석하였다.

• The KIPS Transactions:PartD
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• v.10D no.6
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• pp.983-990
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• 2003

Developing a component-bassed software requires verified and standardized software components. This paper presents and approach to build conponent quality assurance process based on process patterns. To describe process patterns, a metamodel is suggested and several process for software components. The process pattern approach was applied to real projects and its advantages and disadvantages are discussed.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.189-190
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• 2002

PMF(Positive Matrix Factorization) 모텔은 기존의 인자분석 모델이 갖는 인자부하량의 음수 문제를 해결하기 위해 인자부하량과 공통인자를 양수로 제한하여 결과 해석에 명확성을 주었다. 또한 환경연구에서 많이 나타나는 outlier와 log-normal분포모형을 선택사항으로 도입하고 있어 현재 환경관련 연구에 응용성이 높다. 본 연구에서는 대전 1, 2 공단 지역의 PM 10 중 미량금속과 이온성분의 농도를 분석하고 PMF를 이용하여 오염원을 확인하고자 한다. (중략)

• Journal of Korean Association for Spatial Structures
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• v.7 no.2 s.24
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• pp.75-82
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• 2007

Building costs means capital costs which include cost of land, cost of acquiring and preparing the site, construction costs, engineering fees, furnishings, cost of financing the project, and cost of management required to run and maintenance the building for use. An economic analysis is one of the most important factor to determine the project feasibility. The purpose of the this study is to analysis on the construction cost structure of steel truss stadium.

• The Bulletin of The Korean Astronomical Society
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• v.39 no.1
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• pp.86.1-86.1
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• 2014

흠경각루(欽敬閣漏)는 1438년 장영실이 제작한 자동물시계로 천상의 모습을 재현한 천문시계의 역할을 갖추었다. 흠경각(欽敬閣)은 세종의 통치 철학을 세우는 중요한 공간이었다. 이곳에 설치한 흠경각루는 가산(假山) 외부에 빈풍사시의 풍경을 그려서 농사짓는 백성들의 어려움을 살필 수 있도록 하였고, 의기(倚器)를 설치하여 기울어진 그릇을 권력에 비유하여 조심하도록 하였다. 또한 12지신(支神)과 12명의 옥녀(玉女), 4신(청룡, 백호, 주작, 현무)과 4명의 옥녀, 그리고 종 북 징을 타격하여 시간을 알려주는 다양한 시보인형들과 태양운행을 살펴 볼 수 있는 종합적 연출이 가미된 당시의 첨단적 시계였다. 이러한 흠경각루의 작동은 가산 내부에 위치한 물시계와 수차에 의해서 발생된다. 물시계로부터 얻어지는 일정량의 물에 의해 수차가 회전하고, 천형장치를 활용해 회전속도를 제어할 수 있었다. 본 연구에서는 흠경각루의 동력발생과정을 유기적으로 살펴 볼 수 있도록 개념 설계를 실시하였다. 또한 3D 모델링과 기초설계도를 작도하여 실험에 활용할 수 있는 수차제어시스템 모형을 제작하였다.

• Journal of Navigation and Port Research
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• v.28 no.8
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• pp.699-707
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• 2004

The purpose of this paper is to conduct an empirical analysis in order to how cooperative relationships such as joint venture, management cooperation and agency contracts affect the business performance of Korean freight forwarders. In order to fulfill the paper objective, this paper examines the roles of freight forwarders and business environment of Chinese markets.

• Journal of Korean Association for Spatial Structures
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• v.7 no.1 s.23
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• pp.87-94
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• 2007

An economic analysis is one of the most important factor to determine tile project feasibility. In some mega project, however, it is not unique factor to make a Go or No-Go decision because of overriding this work, an economic aspect by some project indirect factor such as political, social, environmental and technical factor, etc. The purpose of the this study is to investigate the cost model effects of spatial structure.

• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.6
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• pp.37-45
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• 2008

It is expected that conditions of water resources will be changed in Korea in accordance with world wide climate change. In order to deal with this problem and find a way of minimizing the effect of future climate change, the usefulness of climate model simulation information is examined in this study. The objective of this study is to assess the applicability of GCM (General Circulation Model) information for Korean water resources management through uncertainty analysis. The methods are based on probabilistic measures of the effectiveness of GCM simulations of an indicator variable for discriminating high versus low regional observations of a target variable. The formulation uses the significance probability of the Kolmogorov-Smirnov test for detecting differences between two variables. An estimator that accounts for climate model simulation and spatial association between the GCM data and observed data is used. Atmospheric general circulation model (AGCM) simulations done by ECMWF (European Centre for Medium-Range Weather Forecasts) with a resolution of $2^{\circ}{\times}2^{\circ}$, and METRI (Meteorological Research Institute, Korea) with resolutions of $2^{\circ}{\times}2^{\circ}$ and $4^{\circ}{\times}5^{\circ}$, were used for indicator variables, while observed mean areal precipitation (MAP) data, discharge data and mean areal temperature data on the seven major river basins in Korea were used for target variables. The results show that GCM simulations are useful in discriminating the high from the low of the observed precipitation, discharge, and temperature values. Temperature especially can be useful regardless of model and season.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.3
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• pp.52-61
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• 2020

This study developed a legibility distance(LD) model for three colors used in VMS according to luminance under foggy conditions through experiments. For this, a simulated environment was created, and LD values of red, green, and yellow color were collected by increasing the luminance. From the test results, the LDs for red at luminance levels of 2,000 cd/㎡ and 20,000 cd/㎡ and a visibility distance of 10m were 10.2m and 18.8m, respectively, which was an improvement of 84%. The LD was improved by 34% and 17% at a visibility distance of 20 m and 30 m, respectively. For green, the LD was improved by 69%, 63%, and 19% at visibility distance of 10m, 20m, 30m, respectively. For yellow, the LD was improved by 100%, 47%, and 36% at visibility distance of 10m, 20m, 30m, respectively. The LD models for three colors were developed by using two independent variables, luminance value and visibility distance. The adjusted coefficients of the red, green, and yellow model equations were calculated as 0.982, 0.978, and 0.915, respectively, and the explanatory power of all models was very high.

• Journal of Korea Water Resources Association
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• v.35 no.2
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• pp.161-171
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• 2002

It has been known that the accurate estimates of 2-dimensional water quality model parameters are difficult for non-experts due to the complexity of theoretical background and input requirement and complicated inter-relationship between model Parameters. The main goal of this study is to Provide expert system for the optimal estimation of water quality model parameters, which is based on the development of chaining mechanism according to the sensitivity analysis of model parameter interactions and GUI interface system on ArcView Avenue. The selected study area is the 35.3- km main Han river starting from Paldang Dam site to the Point of Indo bridge and the tributary inflows including pollutant data are used for the system application and validation. The estimated main model parameters are 0.367 for transverse dispersion coefficient, 0.074 for and 0.162 for. It also shows that the simulated water quality constituents such as DO and BOD based on the estimated model parameters are well agreed with the observed ones. It can be concluded that the developed GIS-based expert system for water quality model parameter estimation and graphical representation of water quality analysis is useful for the scientific water quality management.