• Journal of Korean Society for Geospatial Information Science
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• v.20 no.4
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• pp.97-104
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• 2012

Recent climate change has increased the occurrence of flood disaster. There are two approaches to prevent flooding damage. One is a structural method and the other is a non-structural method. The production and usage of a flood risk map are the example of non-structural way. The flood risk map displays several kinds of information to minimize casualties and property damage caused from flooding. In order to increase the usage of current flood risk maps and improve intuitive recognition of flood information, this paper produced flood risk maps based on geo-spatial information system using three dimensional virtual reality techniques and investigated the applicability of the maps. Because flood information is easily accessed through online, flood risk maps suggested in this paper are regarded as an efficient tool.

• The Journal of the Petrological Society of Korea
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• v.24 no.3
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• pp.233-252
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• 2015

This research are systematic and scientific approaches to obtain the distribution, occurrence and quality of granite stone for building purposes. The process of dimension stone exploration must be carried out to know the underground potentiality of granitic body using the basic data collection and study, field mapping, detailed drilling survey, televiewer technique, and physical and chemical tests in the Geochang area. Televiewer data obtained in drilling boreholes can be accurately distinguished from the discontinuous face, strike and inclination, extension which is difficult to obtain in a core logging. 3D joint images will be helpful to establish a quarry exploitation plan because the 3D joint images give quite accurate information down to depth below the outcrop surface. Through the process of the quality estimation on the Geochang site, the proven reserve estimated as dimensional building stone are calculated with good quality in petrologic and physical properties.

• Journal of Korean Society for Geospatial Information Science
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• v.3 no.2 s.6
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• pp.29-42
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• 1995

Route design in topographical plane map brings many problems in efficiency and requires much time and labor by hand Recently, the active studies of efficient route design method using 3-D terrain information are being developed according to increasing concentration on GSIS. In order to analyze terrain information for route design efficiently, this study presents objective and overall datum by applying SQL in construction and analysis of database and the possibility of three-dimensional terrain information analysis, This study generates 3-D base map on topographical map of scale 1:5,000 and acquires terrain information that have various thematic map data; contour, land use, roadway, and drange. This is a study on the application of SQL in route design and construction of the terrain information that linked by graphic datum of completed topographical map and attributed datum of database. As the result of this study, we can produce promptly and efficiently design datum of profile annotation, cross section, and volume computations to the preliminary route for route design and apply this efficient method to route design by understanding visual DTM which is composed of the roadway and the natural scene after design.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.1
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• pp.1-6
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• 2013

Three Surface cracks are among the more common flaws in aircraft and pressure vessel components. Accurate stress intensity analyses and crack growth rate data of surface-cracked components are needed for reliable prediction of their fatigue life and fracture strengths. Three Dimensional finite element method (FEM) was used to obtain the stress intensity factor for surface cracks existing in structures. A geometry model, i.e. a solid containing one or several 3D cracks is defined. Nodes are generated by bucket method, and quadratic tetrahedral solid elements are generated by the Delaunay triangulation techniques. To examine accuracy and efficiency of the present system, the stress intensity factor for a semi-elliptical surface crack in cylindrical structures subjected to pressure is calculated. Analysis results by present system showed good agreement with those by ASME equation and Raju-Newman's equation.

• The Transactions of the Korea Information Processing Society
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• v.4 no.11
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• pp.2840-2848
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• 1997

Recognition of 3D objects using computer vision is complicated by the fact that geometric features vary with view orientation. An important factor in designing recognition algorithms in such situations is understanding the variation of certain critical features. The features selected in this paper are the angles between landmarks in a scene. In a class of polyhedral objects the angles at certain vertices may form a distinct and characteristic alignment of faces. For many other classes of objects it may be possible to identify distinctive spacial arrangements of some readily identifiable landmarks. In this paper given an isotropic view orientation and an orthographic projection the two dimensional joint density function of two angles in a scene is derived. Also the joint density of all defining angles of a polygon in an image is derived. The analytic expressions for the densities are useful in determining statistical decision rules to recognize surfaces and objects. Experiments to evaluate the usefulness of the proposed methods are reported. Results indicate that the method is useful and powerful.

• Conservation Science in Museum
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• v.14
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• pp.81-89
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• 2013

This study concerns UV-Vis spectrophotometry and 3D-fluorescence spectrophotometry analysis of textile parts of blue and green tones dyed with indigo of blue tone and turmeric, gardenia, goldthread and amur cork tree of yellow tone. In order to verify whether the kinds of textiles affected analysis result of each dye, silk and cotton textile samples were produced. According to the analysis of the degree of reflection of UV-Vis spectrophotometry, unique reflection spectrum of indigo appeared regardless of the kinds of textiles when they were dyed with indigo. As for textiles of green tone, the 3D-fluorescence spectroscopic analysis result showed that unique spectrums of yellow dyes, turmeric, goldthread and amur cork tree appeared regardless of the kinds of textiles but the fluorescence spectrums of gardenia and indigo did not appear.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.5
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• pp.3007-3013
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• 2014

The objectives of this study was to evaluate the validity of 3D digital models made from blue LED dental scanner. Twenty same cases of stone models and 3d digital models were manufactured for this study. Intercanine distance, intermolar distance, two dental arch lengths(right, left) and two diagonal of dental arch lengths(right, left) were measured for evaluation of validity. The nonparametric Wilcoxon rank sum test was used for statistical analysis (${\alpha}$=0.05). Although stone models showed larger than digital models in all measured distances(p<0.05), none exceeded the clinically acceptable range.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.102-102
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• 2017

갈수시 하천의 수질문제는 다양한 요인에 의해 발생하고 제어된다. 수질 그 자체는 상류나 지류의 점오염원과 비점오염원의 증가 또는 예상치 못한 추가적인 오염원의 유출에 직접 영향을 받으며, 조류 등의 발생도 영향인자인 수온 및 일사량 또는 바람에 의존적이다. 최근 수년간은 특히 빈번한 가뭄조건의 발생으로 인하여 갈수기의 강우 및 유출량이 저조하여 상대적으로 하천의 조류발생이 다수 발견되고 보고된 바 있다. 이와 같은 수질의 이상상태를 일시적으로라도 제어하기 위한 방편으로 유량의 증가, 인위적인 하천 수위의 변동 및 유속 변동 등이 고려될 수 있으며, 이를 위해서는 상류의 댐과 하천의 다기능보 등의 조절을 탄력적으로 수행하여야 한다. 이와 같은 시설물 운영효과는 수질문제의 원인을 근본적으로 해결하는 것은 아니지만, 이의 일시적인 효과를 극대화하기 위해서는 기존의 수리 수질 모델링이 이상 수질 발생시의 방제 및 사후분석 등을 중심으로 이루어진 부분을 넘어서, 사전 설정된 조건에 의한 예측모의와 가이드라인의 연계방식이 효과적일 것이다. 본 연구는 수질 이상이 빈번히 발생되었던 낙동강의 칠곡 하류 하천을 중심으로 2차원 CE-QUAL-W2 모형과 EFDC모형을 병행 모의하여 다기능보 인근의 표층과 저층의 수온(밀도) 성층화 및 이의 해소와 관련된 수리모의 및 수질인자에 대한 영향을 분석하였다. 수리모형 구축의 적정성은 현장의 실측 수온과 모의결과 비교를 통해 확인하였으며, 구축된 수리 수질 모델을 이용하여 추가방류량 3~23백만$m^3$ 규모에서 발생하는 수리적인 수층혼합 현상과 일시적으로 저감가능한 수질개선 효과가 의미있는 수준으로 나타날 수 있음을 예측하였다. 또한, 다기능보의 수문방류 모의시에 개방조건을 0.3~3.5m로 달리하여 방류기간 중 총방류량이 유사하더라도 최대방류량 또는 유속이 충분치 않은 경우에는 혼합효과가 급격히 감소함을 알 수 있었다. 연구에서 밝혀진 조건들을 향후 보다 효과적으로 수치모의하기 위한 방안으로서 EFDC모형의 내부경계조건을 다기능보의 문비조건(RSG, Lift 등)에 맞게 조정하는 방법을 제안하고 그 적용성을 검토한 뒤 모형을 부분 수정하여 제시하였다.

• Journal of Sasang Constitutional Medicine
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• v.20 no.3
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• pp.70-81
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• 2008

1. Objective Recently we have known 'First Impression' is the major factor to check the review point for the classification of sasangin. And we want to find out the objected data contribute to dignosis of female sasang constitution using Sasangins Face. 2. Methods We analysed the datum collected by multi-center researchers in 2007-2008. And this study analysed the datum of the measurement of the face by 3D-AFRA (3-Dimensional Automatic Face Recognition Apparatus) and the items of impression by SDQ. We used chi-square test to define the relationship between the item and sasang constitutions. We used independent samples t - test with classifying measuring variables of the face. 3. Results and Conclusion We put out specific female sasangin's constitutional measuring variables of face. The measuring variables of count is Taeyangin 30point, Soyangin 15point, Taeumin 32point, Soeumin 21point. There is the need to accumulate more accurate pictures about sasangin's external shape.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.5
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• pp.879-888
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• 2021

With the development of information and communication technology, the demand for indirect experience contents using realistic media is increasing. It is important to keep the overall concept of the models consistently in order to immerse in the contents while watching realistic media. In the case of realistic media that provides an indirect experience of tourist attractions, modeling should be done by reflecting the actual information of the sites in order to provide an accurate experience. In this paper, we propose a three-dimensional modeling method of islands, representative tourism resources of the southern coast, by reflecting actual data. Since the proposed method is performed according to a structured procedure, it makes it easy to maintain the visual consistency of the entire model when several people work together. Implementation results show that the proposed method produces more realistic results than the modeling method using height information simply.