• 농촌계획
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• 제19권4호
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• pp.177-189
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• 2013

3D modeling and rendering technologies are getting more attention from landscape planners and architects because the virtual reality based on 3D graphic technology could give more realistic experience to landscape simulation users and boost promotional effects. The 3D landscape simulation, however, not only requires a lot of cost and time in production, but also demands efforts to distribute to consumers due to various computing environment of them. The purpose of this study is to suggest a process for developing an interactive 3D landscape simulator with low-cost, which can support multi-platform functionality in high quality through reviewing related current software and web services. We select GIMP for 2D image texturing, SketchUpfor 3D modeling, Unity for real-time rendering, and Google Earth for terrain modeling considering price and workability and apply the developed process for Windows, Web, and Android versions to test the applicability for Sangji-ri, Gosam-myeon, Gyeonggi-do, Korea.

• 한국BIM학회 논문집
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• 제10권4호
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• pp.89-97
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• 2020

The purpose of this study is to identify the problems of the currently used 3D spatial information utilization system to realize a more accurate landscape and to establish a user-oriented environment to improve the utilization plan for future landscape evaluation. As citizens' interest in urban landscapes with strong public characteristics increases and the speed of urban development also increases, more suitable simulation methods for landscape management are required. Nevertheless, there are many cases of inconvenient correction according to development changes along with many errors in various steps for creating landscape simulation. Therefore, in performing landscape deliberation according to development, it is necessary to create more accurate and efficient landscape simulation, and if changes occur after the initial deliberation, a process that can quickly and conveniently correct and supplement data is needed. In addition, it is necessary to create landscape simulation so that the created modeling source can be used by being compatible with other application programs. In this study, a method of constructing a more accurate and efficient simulation at the time of initial deliberation and a method of creating a landscape simulation model for rapid response to a plan that is changed at the time of re-deliberation are described.

• 한국농공학회논문집
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• 제56권5호
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• pp.29-36
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• 2014

The purpose of this study is to improve the Generic Agricultural Systems Simulator (GASS) which can simulate various rural systems based on object-oriented model. GASS provides the configuration platform of various system components to simplify integrated agricultural system models such as irrigation systems for rice farming. The new connection and communication modules of GASS improve applicability for modelling diverse systems. The geometric connection of GASS replaces topological connection, and communication protocols expand to analyze not only homogeneous system but also heterogeneous system. In this paper, we applied GASS2 to simulate the water heights of linked tanks and the simulation outputs were verified through comparing with analytical solutions of differential equations. The two new modules make it possible to analyze the 4-tank problem which includes topological and heterogenous issues with GASS2.

• 한국환경복원기술학회지
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• 제22권6호
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• pp.115-124
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• 2019

In a climate change environment where heat damage and drought occur during a rainy season such as in 2018, a vegetation-based LID system that enables disaster prevention as well as environment improvement is suggested in lieu of an installation-type LID system that is limited to the prevention of floods. However, the quantification of its performance as against construction cost is limited. This study aims to present an experiment environment and evaluation method on quantitative performance, which is required in order to disseminate the vegetation-based LID system. To this end, a 3^rd quartile huff time distribution mass curve was generated for 20-year frequency, 60-minute probable rainfall of 68mm/hr in Cheonan, and effluent was analyzed by recreating artificial rainfall. In order to assess the reliability of the rainfall event simulator, 10 repeat tests were conducted at one-minute intervals for 20 minutes with minimum rainfall intensity of 22.29mm/hr and the maximum rainfall intensity of 140.69mm/hr from the calculated probable rainfall. Effective rainfall as against influent flow was 21.83mm/hr (sd=0.17~1.36, n=20) on average at the minimum rainfall intensity and 142.27mm/hr (sd=1.02~3.25, n=20) on average at the maximum rainfall intensity. In artificial rainfall recreation experiments repeated for three times, the most frequent quartile was found to be the third quartile, which is around 40 minutes after beginning the experiment. The peak flow was observed 70 minutes after beginning the experiment in the experiment zone and after 50 minutes in the control zone. While the control zone recorded the maximum runoff intensity of 2.26mm/min(sd=0.25) 50 minutes after beginning the experiment, the experiment zone recorded the maximum runoff intensity of 0.77mm/min (sd=0.15) 70 minutes after beginning the experiment, which is 20 minutes later than the control zone. Also, the maximum runoff intensity of the experiment zone was 79.6% lower than that of the control zone, which confirmed that vegetation unit-type LID system had rainfall runoff reduction and delay effects. Based on the above findings, the reliability of a lab-level rainfall simulator for monitoring the vegetation-based LID system was reviewed, and maximum runoff intensity reduction and runoff time delay were confirmed. As a result, the study presented a performance evaluation method that can be applied to the pre-design of the vegetation-based LID system for rainfall events on a location before construction.

• 대한원격탐사학회지
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• 제9권2호
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• pp.21-34
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• 1993

디지탈화된 지형 정보는 조망분석, 토목계획이나 설계, 또는 지리정보시스템등 여러 분야 에 필요한 요소가 된다. 또한 컴퓨터에 적절한 형식으로 입력된 지형정보는 모의 비행훈련이나 무인비행장치에서도 사용될 수 있다. 지형정보는 지도위에 등고선을 비롯한 여러가지 기호들로 표시되어 있어서 훈련된 요원에 의해 분석된다. 자동분석을 위해서는 컴퓨터에 입력되어야 하는 데 디지타이징 타블렛과 같은 장비를 사용하여 수동으로 입력하는 것은 많은 시간과 인력을 필요 로 한다. 본 논문에서는 이차원 지형도로부터 삼차원 지형정보를 자동적으로 추출하는 방법을 다 루고 있다. 등고선 조각연결 알고리즘을 포함하는 몇 가지 알고리즘들이 제안되었고 실제 지형도 를 사용하여 실험되었다.

• 한국농공학회논문집
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• 제58권1호
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• pp.81-90
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• 2016

The Agricultural Systems Application Platform (ASAP) provides bottom-up modelling and simulation environment for agricultural engineer. The purpose of this study is to expand usability of the ASAP to the second order partial differential equations: elliptic equations, parabolic equations, and hyperbolic equations. The ASAP is a general-purpose simulation tool which express natural phenomenon with capsulized independent components to simplify implementation and maintenance. To use the ASAP in continuous problems, it is necessary to solve partial differential equations. This study shows usage of the ASAP in elliptic problem, parabolic problem, and hyperbolic problem, and solves of static heat problem, heat transfer problem, and wave problem as examples. The example problems are solved with the ASAP and Finite Difference method (FDM) for verification. The ASAP shows identical results to FDM. These applications are useful to simulate the engineering problem including equilibrium, diffusion and wave problem.

• 대한지리학회지
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• 제50권3호
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• pp.255-276
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• 2015

최근 지표환경변화과정에서 발생하는 복잡계적 특성에 대한 관심이 증가하고 있으며, 이러한 문제를 해결하기 위한 도구로 다행위자시스템에 대한 연구가 활발하게 이루어지고 있다. 이 연구는 최근 한국의 산림정책에서 중요하게 다루어지고 있는 산림개방의 문제를 사례로 토지피복변화의 직간접적인 영향을 평가할 수 있는 다행위자시스템(Multi-Agent System)을 개발하여, 강원도 평창과 정선의 가리왕산과 그 주변지역에 적용하였다. 이 연구에서 사용한 다행위자시스템은 LUDAS(Land Use DynAmic Simulator)로 인문환경과 자연환경의 공간적인 이질성과 상호작용을 동적으로 구현하는 강점이 있으며, 산지개방에 따른 사회 경제 및 자연환경적 영향을 종합적으로 비교 평가할 수 있는 장점을 가지고 있다. 모형은 인간 행위자와 그 의사결정으로 이루어져 있는 인문환경시스템, 자연환경과 산림생태계를 대표하는 자연환경시스템, 이를 연결하는 상호작용 연결고리와 정책 시나리오로 구성하였다. 모의 결과는 산림정책의 결과로서 지역주민의 소득과 생태계서비스의 가치, 소득 불평등의 정도로 도출하였다. 그 결과 최적의 산림정책 시나리오는 지형을 고려하여 산지를 개방하고, 지역주민을 대상으로 개방하며, 휴양지 목적의 산지 개방으로 도출되었다. 이 연구는 산림정책 수립과 토지이용 관련 정책연구를 위한 의사결정시스템 개발에 중요한 기여를 할 수 있을 것으로 기대된다.