• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 2001년도 춘계 공동학술발표회
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• pp.387-389
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• 2001

• 한국산업융합학회 논문집
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• 제5권1호
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• pp.65-74
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• 2002

This paper intends to investigate such effects through experiments. The contents of the investigation are effects of position of repeated loading and unloading, passing frequency. For the purpose of the investigation an experimental load-deflection system is developed and the system is possible to measure deflection of the wall and earth pressure due to different size of strip loading and cyclic loading. The findings from the experiments are as follows: 1. As repeated loading approaches to the wall, the measured horizontal residual earth pressure agrees well with Rowe's empirical formula, while as the loading is far from the wall the earth pressure consists with Boussinesq's and Spangler's formulas. Also it is found that below 0.6m depth from ground surface the effects of repeated loading can be nearly neglected. 2. From comparison analyses of earth pressure theories and experimental results, a reagression equation is suggested herein, and earth pressure at any depth and maximum earth pressure due to cyclic loading can be estimated from the equation.

• 한국게임학회 논문지
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• 제4권1호
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• pp.26-33
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• 2004

MMOPRG는 게임의 장르적 특성상 플레이어가 게임월드(Game World)의 환경에 매우 큰 영향을 받는다. 따라서 게임월드에 구현되어진 물리적환경은 게이머에게 사실감과 몰입감을 주는 중요한 요소이다. 또한 구현된 물리적 환경이 게임 플레이에 영향을 주는 게임 시스템은 게임 플레이어에게 더 많은 사실감과 몰입감을 줄 수 있다. 본 연구에서는 현재 서비스되고 있는 MMORPG를 중심으로 어떠한 지구환경요소가 구현 되었고, 구현된 지구환경요소가 게임 플레이에 어떠한 영향을 주는 게임시스템이 구현되고 있는지 현황을 조사하였다. 지구환경을 시뮬레이션한 게임 시스템 즉, EESS(Simulative System of Earth Environment)를 디자인하기 위해서는 어떠한 문제점이 있는지 알아보았고, EESS를 좀더 쉬운 방법으로 접근하기 위해서 게임 월드에 구현된 환경의 대기상태, 풍향, 풍속, 일기현상 등의 상태정보를 처리하는 시스템인 '환경정보시스템(Environment Information System)' 개발을 보완기술로 모색하였다.

• 한국안전학회지
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• 제31권4호
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• pp.104-110
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• 2016

The effect of a partially earth anchored cable system on the structural safety of a long span cable-stayed bridge under seismic and wind loads are examined during construction process. By assuming the FCM (free cantilever method) construction stages with structural vulnerability, a multi-mode spectral analysis and a multi-mode buffeting analysis are performed for specific seismic load and wind load, respectively. Results show that the wind load dominates the structural safety of a cable-stayed bridge during construction. And, the application of a partially earth anchored cable system can enhance structural safety under wind load since the maximum pylon moment in the model with partially earth anchored cable system is reduced by 49% under wind load. In contrast, the maximum pylon moment occurred by seismic load is only decreased by 8%.

• 한국지구과학회지
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• 제23권1호
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• pp.105-111
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• 2002

The observation of the new biotite isograd (chlorite + chloritoid = andalusite + biotite) in the Mungyong coal field requires the modification of Harte and Hudson's (1979) metapelite grid which eliminates the stability field of staurolite + cordierite assemblages. The newly proposed metapelite grid by Ahn and Nakamura (2000) can define more properly the isograd reaction observed from nature. We discuss first topological interrelations between synthetic system (FASHO-, KFASHO-, KFMASH system) on an isobaric section at 2kbar, where phase relations are well constrained. The following discussion is concentrated on the topological relations between stable reactions. At the last, we discuss the petrogenetic significance of the Ahn's petrogenetic grid compared with theoretically computed grids. Ahn's petrogenetic grid is consistent with synthetic and natural system, and is one of the excellent example of KFMASH approximation in metapelite.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.369-371
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• 2003

This paper attempts to study the evolution of the Solar System including the earth through various existing hypotheses and the occurrence of earthquakes on the earth. From the analysis of the various theories it can be inferred that the Mystery regarding evolution of Solar System is a complex problem which requires continuos research. The occurrence of the earthquake is also affected by the earth's rotation, which produces Centrifugal Force, which together with convection current causes plate displacement resulting in earthquakes. The extent of displacement varies with the size and density of the plates.

• 대한원격탐사학회지
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• 제37권4호
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• pp.777-788
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• 2021

Since aerosol has a relatively short duration and significant spatial variation, satellite observations become more important for the spatially and temporally continuous quantification of aerosol. However, optical remote sensing has the disadvantage that it cannot detect AOD (Aerosol Optical Depth) for the regions covered by clouds or the regions with extremely high concentrations. Such missing values can increase the data uncertainty in the analyses of the Earth's environment. This paper presents a spatial gap-filling framework using a univariate statistical method such as DCT-PLS (Discrete Cosine Transform-based Penalized Least Square Regression) and FMM (Fast Matching Method) inpainting. We conducted a feasibility test for the hourly AOD product from AHI (Advanced Himawari Imager) between January 1 and December 31, 2019, and compared the accuracy statistics of the two spatial gap-filling methods. When the null-pixel area is not very large (null-pixel ratio < 0.6), the validation statistics of DCT-PLS and FMM techniques showed high accuracy of CC=0.988 (MAE=0.020) and CC=0.980 (MAE=0.028), respectively. Together with the AI-based gap-filling method using extra explanatory variables, the DCT-PLS and FMM techniques can be tested for the low-resolution images from the AMI (Advanced Meteorological Imager) of GK2A (Geostationary Korea Multi-purpose Satellite 2A), GEMS (Geostationary Environment Monitoring Spectrometer) and GOCI2 (Geostationary Ocean Color Imager) of GK2B (Geostationary Korea Multi-purpose Satellite 2B) and the high-resolution images from the CAS500 (Compact Advanced Satellite) series soon.

• IUGG한국위원회:학술대회논문집
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• IUGG한국위원회 2003년도 정기총회 및 학술발표회
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• pp.14-14
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• 2003

SAR (Synthetic Aperture Radar) is an imaging radar which can scan and image Earth System targets without solar illumination. Most Earth observation Shh systems operate in X-, C-, S-, L-, and P-band frequencies, where the shortest wavelength is approximately 1.5 cm. This means that most opaque objects in the SAR signal path become transparent and SAR systems can image the planetary surface targets without sunlight and through rain, snow and/or even volcanic ash clouds. Most conventional SAR systems in operation, including the Canada's RADARSAT-1, operate in one frequency and in one polarization. This has resulted in black and with images, with which we are familiar now. However, with the launching of ENVTSAT on March 1 2002, the ASAR system onboard the ENVISAT can image Earth's surface targets with selected polarimetric signals, HH+VV, HH+VH, and VV+HV. In 2004, Canadian Space Agency will launch RADARSAT-II, which is C-band, fully polarimetric HH+VV+VH+HV. Almost same time, the NASDA of Japan will launch ALOS (Advanced land Observation Satellite) which will carry L-band PALSAR system, which is again fully polarimetric. This means that we will have at least three fully polarimetric space-borne SAR system fur civilian operation in less than one year. Are we then ready for this new all weather Earth Observation technology\ulcorner Actual imaging process of a fully polarimetric SAR system is not easy to explain. But, most Earth system scientists, including geologists, are familiar with polarization microscopes and other polarization effects in nature. The spatial resolution of the new generation of SAR systems have also been steadily increased, almost to the limit of highest optical resolution. In this talk some new applications how they are used for Earth system observation purpose.

• 한국지반공학회논문집
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• 제24권3호
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• pp.25-34
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• 2008

프리스트레스트 띠장을 적용한 새로운 흙막이 시스템에 대한 유한요소 해석이 수행되었다. 본 연구에서는 프리스트레스트 띠장을 적용한 흙막이 시스템의 거동을 규명하기 위하여 3 차원 유한요소 모델이 적용되었다. 새로운 흙막이 시스템에 대한 유한요소 모델링 절차와 방법이 제시되었다. 지반, 벽체, 버팀보 및 프리스트레스트 띠장 시스템을 구성하고 있는 띠장, 받침대, 강선에 대한 모델링과 지반-벽체 그리고 벽체-띠장 간의 접촉면 모델링이 제시되었다. 벽체 횡방향 변위, 버팀보 축력, 프리스트레스트 띠장 시스템 부재인 띠장과 받침대 축력에 대한 유한요소 해석결과가 현장 계측결과와 비교 검증되었다. 검증된 3 차원 유한요소 모델을 이용하여 강선 인장력 변화에 따른 새로운 프리스트레스트 띠장의 휨모멘트와 변형 거동이 규명되었으며 이에 따른 흙막이 벽체 배면에서의 토압 거동이 규명되었다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.54-58
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• 2006

본 논문에서는 공동주택에 적합한 인하도선시스템과 접지시스템 설계를 위한 기본적 사항에 대하여 고찰하였다. 공동주택의 철근구조체는 전기적 연속성을 갖지만 철근들끼리의 결속선에 의한 접속은 전자기계력에 대한 내력이 부족하다. 따라서 전용의 인하도선을 설치하고 이들을 건물 양 측벽의 철근구조체와 본딩하여 낙뢰전류가 인하도선 및 철근구조체에 분산되어 흐르게 하는 인하도선시스템을 제시하였다. 한편 공동주택의 접지시스템은 건물기초접지극과 피뢰설비를 위한 환형 접지극으로 각각 구성하고 이들을 서로 본딩하는 접지시스템을 제시하였다. 또한 공동주택 각동의 건물기초접지극을 공동구의 철근구조체나 접지선을 이용하여 서로 연결함으로서 공동주택 단지에 거대한 총괄접지시스템을 구현하는 방안을 제시하였다. 하지만 이러한 피뢰시스템을 구축하기 위해서는 완벽한 본딩시스템의 구축이 전제되어야 한다.