• Journal of Korea Water Resources Association
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• v.48 no.1
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• pp.23-35
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• 2015

In this study, the behavior of fresh water body between the injection and production wells with the fresh water injection rate in a saline aquifer is numerically analyzed by using a three-dimensional numerical model. 8 injection wells are arranged at equidistant intervals on a concentric circle and one production well is located at the center of this circle. In the case that the fresh water injection rate is relatively small, the fresh water body around a injection well screen is not mixed with neighboring ones and is independently distributed. However, when the injection rate is increased, the size of the fresh water body is continuously increased, and the areas, where saline and fresh water among injection wells are mixed, are appeared. The mixed degree is increased as the injection rate is increased. This phenomenon is identically generated around the production well. Moreover, when the injection rate is increased, the ratio of saline water in and around the production well is decreased.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.04a
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• pp.143-145
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• 1996

A new method of fabricating 3-dimensional patterns on single crystal silicon is presented in this paper. The method utlizes both chemical and mechanical reactions to make patterns with dimensions of few microns in width and submicron in height. The primaryadvantage ofthis new method over conventional methods of making patterns on silicon lies in its cost effectiveness and speed. The process introduced in this paper is a maskless process and does not reauire expensive capital investment. It is expected that this method can be employed for flexible and cost effective fabrication of micro-machine components in MEMS application.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10a
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• pp.215-216
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• 2007

• Journal of Biomedical Engineering Research
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• v.25 no.6
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• pp.537-543
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• 2004

In order to create three-dimensional model for human body, a method that reconstructs geometric models from contour lines on cross-section images is commonly used. We can get a set of contour lines by acquiring CT or MR images and segmenting anatomical structures. Previously proposed method divides entire contour line into simply matched regions and clefts. Since long processing time is required for reconstructing cleft regions, its performance might be degraded when manipulating complex data such as cross-sections for human body. In this paper, we propose a fast reconstruction method. It generates a triangle strip with single tiling operation for simple region that does not contain branch structures. If there exist branches in contour lines, it partitions the contour line into several sub-contours by considering the number of vertices and their spatial distribution. We implemented an automatic surface reconstruction system by using our method which reconstructs three-dimensional models for anatomical structures.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.39 no.4
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• pp.245-252
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• 2021

Underground facilities were constructed as needed by various management organizations, the result of which was the disordered and scattered underground spaces. This phenomenon can be viewed as the main cause of safety accidents in the underground space. To solve this problem, research on systematic construction and management of underground facilities should be conducted. Therefore, to improve the accuracy and the quality of information and to facilitate the systematic construction and management of underground facility information, this study aims to establish a 3D data model that conforms to international spatial information standards for pipeline underground facilities and to implement the data model to enable visualization. The result of this study can be used to improve the consistency of information not only between underground facilities, but also the correspondence between above ground and underground facilities. As such, this study has academic significance in that it presents an integrated data model that includes various objects in the ground and underground spaces and enables interoperability between diverse domain data.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2006.05a
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• pp.127-131
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• 2006

본 연구는 VGIS(Virtual Geographic Information System)을 이용, 환경친화적인 도로건설을 위해 실제 좌표를 사용하므로 3차원 도로의 선형과 구조물을 설계하였다. 그리고 시공 중에 발생 할 수 있는 민원문제 및 설계변경 시 효율적인 의사결정 할 수 있도록 하였다. 대상지역은 전라남도 장흥군의 최대 역점사업인 관광을 테마로 한 정남진 가는 길을 컨셉으로 한 '가고 싶은 길', '보고싶은 다리', '기억하고픈 터널'을 주제로 설계하였으며 명실공히 남도의 새로운 관광명소가 될 자연관광도로가 될 것으로 기대된다. 기존의 3차원 설계에서는 평면적인 선형과 구조물의 형상을 이해하는데 상당한 시간이 소요되었지만, 구조물을 3차원으로 설계함으로써, 비전문가라도 구조물을 쉽게 파악할 수 있었다. 그리고 3차원 설계는 기존 구조물과 신설될 구조물 사이에 공사 중 발생할 수 있는 환경 및 민원문제를 사전에 파악할 수 있었다. 또한, 실제와 같이 구현된 도로와 구조물의 시뮬레이션을 통하여 기존의 각종 의사 결정에 있어 보다 시각적 효과를 증진시켜 효율적인 의사결정을 가능하게 하였다. 본 연구에서는 실제 평면 설계에 쓰이는 좌표 값을 3차원설계에 적용하였다. 도로 노선 및 경관분석에 많은 도움이 될 것으로 보이며 VGIS를 이용하므로 도시계획, 식물, 토양, 수로 또는 도로형태, 홍수계획 등 많은 일들이 평가에 사용된다. 여기서는 구조물 3차원 설계에 관한 기초적인 연구를 시행하였으며, 3차원설계를 통해 의사결정 시 효율적인 판단을 할 수 있었고, 환경 친화적 시공 및 설계에 대한 연구가 이루어 져야 될 것으로 판단된다.상의 "일반원칙의 통용"을 계약성립(Formation of Contract)의 과정별로 정리하였다.의 가치, 생활의 편익 등을 증대한다는 믿음 때문이다. 한편 현실은 여러 가지 역기능이 함께 나타나고 있다. '네티즌 윤리강령'까지 선포했지만, 진정한 네티즌 윤리는 강령을 선포했다고 저절로 확립되는 것이 아니다. 네티즌 각자의 실천의지가 있어야 한다. 인류가 새로운 이상향이라고 추구하는 가상사회는 윤리적인 사고와 행동으로 질서를 유지하지 못하면 인류의 밝은 미래는 보장할 길이 없다. 21세기 정보화 사회, 인터넷 사회를 맞이한 우리는 이 세상을 참으로 살기 좋은 세상으로 만들어야 할 고귀한 책무를 안고 있다. 아무리 험한 길, 어려운 과제라 할지라도 그 목표를 잃어서는 안 되며, 그 해답을 얻는 노력을 결코 게을리 해서는 안 된다.기여한 것으로 평가되고 있다. 이들 프로그램은 특히 보조금을 통해 어선의 제3국 영구이전과 낡고 비효율적인 어선의 신조를 가속화시킨 것으로 보고되고 있다.받고 그 의견에 대한 결과를 게시하여 학생들이 제공되기 원하는 식단을 급식 시 제공하여 학생들이 식단선택에 동참할 수 있는 기회를 주는 것이 바람직하겠다. 또한 영양사는 학급의 반대표와의 정기적인 모임을 가짐으로서 학생들의 불만사항 및 개선 요구사항에대해 서로 의견을 교환하여 설문지조사가 아닌 직접적인 대화를 하여 문제점을 파악하고자 하는 적극적인 자세가 필요하겠다. 특히 아침식사의 결식 빈도가 높았고 이는 급식성과에 부정적인 영향을 줄 뿐 아니라 학교에서 제공하는 음식의 섭취정도에도 영향을 주고 있으므로 학생들에게 학부모와 전담교사 및 학교영양사는 학생들에게 이상적

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.32 no.6
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• pp.225-230
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• 2022

A new two-fold interpenetrating two-dimensional (2D) Tb(III) metal-organic framework (MOF), [Tb(p-XBP4)_2.5(H₂O)₂]·W(CN)₈ (1), was prepared using a p-XBP4 (N,N'-p-phenylenedimethylenbis(pyridin-4-one)), Cs₃[W(CN)₈], and Tb(NO₃)₃·6H₂O. The single crystal X-ray diffraction indicated that Tb-MOF exhibits a unique two-fold interpenetrating 2-D framework. It was also characterized through Fourier transform infrared spectroscopy (FTIR), and single and powder X-ray diffraction. To probe the molecular magnetic behavior, the magnetic properties of Tb-MOF were investigated by direct-current (DC) and alternating-current (AC) magnetic susceptibilities measurements and discussed.

• Journal of the Korean Society of Clothing and Textiles
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• v.28 no.11
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• pp.1536-1543
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• 2004

Garment is made by a 2D pattern and should be fitted to a human body which has 3D characteristics. Therefore, to design a pattern more effectively, the use of 3D information of a human body and the investigation of relationship between the 3D garment and 2D pattern are necessary. In this work, ruled surface method was used to reflect the 3D information of a human body for a pattern design. The images of the brassiere line on the woman's dress form were captured by phase-shifting projection moire system and the 3D information on the design line was obtained. 2D patterns on the various parts of the brassiere were developed directly from the 3D data by the ruled surface method. In addition, design line, the area and the amount of dart were quantified. And then we verify the appropriateness of the ruled surface method to the 2D pattern development by measuring the distribution of the space between women's figure and segmented clothing item. It was found that the ruled surface method is useful to transform the 3D design line to the 2D pattern, if we followed the steps suggested in this paper.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.9 no.3
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• pp.334-338
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• 1999

Porous silicon layers were fabricated with various conditions of HF concentration and current density. And their masses were measured. From these data, the porosity and fractal dimension were estimated and analyzed. We found that the porosity was proportional to the current density when the anodic reaction time was fixed and the constant values of fractal dimension could be estimated from a series of data with fixed HF concentration. The values of fractal dimension were decreased with increasing HF concentration. The obtained porosity and fractal dimension were compared with the 2-dimensional computer simulation based on diffusion limited deposition model. According to the simulation, the porosity was proportional to the diffusion length and the fractal dimension was inversely proportional to the diffusion length. Since, the diffusion length is proportional to current density and inversely proportional to base concentration, our experimental data qualitatively agreed with the results from the simulation. The porosity obtained by experiments, however, was not consistent with the results by simulation.

• Radiation Oncology Journal
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• v.15 no.4
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• pp.287-296
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• 1997

Purpose : This is study of whether 3-D conformal radiotherapy for carcino-mas of the ethmoid sinus were better than those treated with conventional 2-D plan, Materials and Methods : The 3-D conformal treatment Plans were compared with conventional 2-D plans in 4 patients with malignancy of the ethmoid sinus. Isodose distribution, dose statistics, and dose volume histogram of the planning target volume were used to evaluate differences between 2-D and 3-D plans. In addition. the risk of radiation exposure of surrounding normal critical organs are evaluated by means of point dose calculation and dose volume histogram. Results : 3-D conformal treatment plans for each patient that the better tumor coverages by the planning target volume with improved dose homo-geneity, compared to 2-D conventional treatment Plans in the same Patient. On the other hand, the radiation dose distributions to the surrounding nor-mal tissue organs, such as the orbit and optic nerves are not significantly reduced with our technique, but a substantial sparing in the brain stem and optic chiasm for each patient. Conclusion : Our findings represented the potential advantage of 3-D treatment planning for dose homogeniety as well as sparing of the normal tissue surrounding the tumor. However, further investigational studies are required to define the clinical benefit.