• Proceeding of EDISON Challenge
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• 2015.03a
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• pp.606-611
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• 2015

초기 화재 진압을 위해 사용되는 스프링클러(sprinkler) 설비는 스프링클러헤드의 형태에 따라 살수 분포가 달라진다. 화점의 발생 위치는 특정하기 어려우므로 스프링클러의 살수범위(spray coverage)가 넓게 퍼지는 형태가 되는 것이 확률적으로 가장 큰 효율성을 가진다. 본 연구에서는 EDISON_전산열유체 시스템의 다상유동 해석자를 활용하여 스프링클러헤드의 형태에 따라 살수각과 국부 유동장을 분석하였다. 3차원 형상을 가지는 스프링클러헤드 형상을 2차원 단면으로 나누어 해석하였으며 프레임(frame)과 반사판(deflector)의 형상에 따른 유동장의 변화를 살펴보았고 살수각(spray angle)을 정량적으로 나타내었다. 최종적으로 최대 최소의 살수각을 갖는 2차원 스프링클러헤드를 형상화하였고 이를 중첩하여 살수 범위를 넓게 갖는 스프링클러헤드를 3차원 모델링하였다.

• Journal of the Korean Society of Clothing and Textiles
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• v.25 no.9
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• pp.1571-1582
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• 2001

한국 전통 의상인 한복 치마의 형태는 천의 특성에 크게 좌우된다. 이에 본 연구에서는 직물의 물성과 착장시 한복 치마 형태의 관계를 규명하고자, 8가지 직물을 선택하여 물성을 측정하고, 비접촉 3차원 인체계측시스템을 이용하여 , 치마 착장시의 5개 수평단면, 2개 수직단면을 작성하였다. 수직 단면에서는 실루엣을 나타내는 각도, 수평단면에서는 단면의 부피감과 드레이프의 형태를 나타내는 노드 간격, 거리, 각도를 측정하였다. 첫째, 경연도, 신장률, 실 두께, 직물 무게의 직물물성요인에 따라 실험 직물은 4집단으로 분류되었다. 둘째, 직물의 물성과 노드의 형태의 관계를 살펴본 결과, 직물이 뻣뻣하고 가벼울수록, 치마윗부분의 각도가 커지며 , 부드럽고, 신축성 이 있고, 무겁고, 두꺼운 실로 짜여지면, 튜블러 형태 의 실루엣을 나타내었다. 셋째 , 수직 단면도상 치마 위쪽과 아래쪽의 퍼짐각도 및 수평단면상의 둘레, 노드간의 거리, 가장 긴 파고와 같은 단면 계측치는 직물물성에 따라 추정 이 가능한 것으로 나타났다.

• Journal of the Korean GEO-environmental Society
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• v.16 no.8
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• pp.45-49
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• 2015

Using 2D numerical analysis that covers the largest section of the dam body, a process is generally performed when evaluating its stability against seepage. The quantity of seepage is first obtained by assuming that its bottom topography is in the simple form of a rectangle, it is then calculated by reflecting its sectional shape during this process of analyzing the seepage quantity. Considering that various forms of dams are being constructed on various types of ground, thanks to more recent technological advances, it is judged more appropriate to draw a conclusion by means of the results on reflecting the realistic shape and topographical conditions of the dam body through 3D numerical analysis. Therefore, this study intends to present a method designed to carry out safety management by evaluating the correct quantity of water leakage that passes only through the dam body, having excluded other factors that include the amount of rainfall through the 3D FEM analysis.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.2
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• pp.188-198
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• 2021

Digital data was collected using modern three-dimensional digital technology. Current content-specific technologies were investigated through domestic and foreign cases so that three-dimensional digital technology could be applied to the utilization of various contents. First, the use of three-dimensional digital technology of architectural cultural assets has been changing from the restoration of cultural assets. Second, some of the contents produced were found to be underutilized. Third, the type of content has been changing in experience and exhibition, but the online approach was small. Fourth, digital restoration using domestic IT technology has been used as a technology to restore overseas cultural heritage. The fifth analysis of the relationship between the content types and 3D digital technologies shows the use of currently limited technologies. This study analyzed the status of digital architecture and the application of three-dimensional digital technologies to lay the foundation for the active development and utilization of content. Subsequent studies on various layers and digital technologies will be needed to revitalize digital architectural cultural assets in the future.

• Proceedings of the Korean Fiber Society Conference
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• 2002.04a
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• pp.235-238
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• 2002

3차원 어패럴 캐드 시스템은 의복 생산 공정의 자동화를 위해 꾸준히 연구되고 있다. 이러한 어패럴 캐드 시스템의 주요한 목표 중의 하나가 소량 주문 생산에의 대응이다. 그런데 인체의 형태는 매우 다양하므로 개개인의 인체 형태에 대응하는 적합한 의복 디자인을 위해서는 먼저 정확한 인체 형태의 정확한 계측이 필요하다. 인체 데이터의 3차원적인 제품들인 계측은 그동안 많은 연구가 이루어져 상업화된 제품도 다수 출시되었다. (중략)

• The KIPS Transactions:PartB
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• v.15B no.6
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• pp.553-560
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• 2008

The amount of image data used in medical institution is increasing rapidly with great development of medical technology. Therefore, an automation method that use image processing description, rather than manual macrography of doctors, is required for the analysis large medical data. Specially, medical image registration, which is the process of finding the spatial transform that maps points from one image to the corresponding points in another image, and 3D analysis and visualization skills for a series of 2D images are essential technologies. However, a high establishment cost raise a budget problem, and hence small scaled hospitals hesitate importing these medical visualizing system. In this paper, we propose a visualization system which allows user to manage datasets and manipulates medical images registration using an open source graphics tool - VTK(Visualization Tool Kit). The propose of our research is to get more accurate 3D diagnosis system in less expensive price, compared to existing systems.

• The Korean Journal of Mycology
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• v.29 no.2
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• pp.91-98
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• 2001

The mycelial morphology during submerged cultivation of Ganoderma ludium using by air-lift fermenter system were analyzed by image processing system and the characterization of mycelial morphology were investigated. In submerged culture using medium with different ammonium phosphate concentrations, the various morphological forms of G. lucidum mycelium were observed. The filamentous forms such as non-branched long filamentous mycelium, non-branched short mycelium, branched long filamentous mycelium, branched short mycelium, entangled mycelium and clump were observed, and also, and also, the pelleted forms such as smooth pellet, rough pellet and hollow rough pellet were observed. The mycelial morphology was changed from the filamentous to the pelleted forms by addition of ammonium phosphate. The fractal dimensions of pelleted and filamentous forms were 1.05 and 1.3, respectively, while the fractal dimension of mixtures of pelleted and filamentous forms was 1.16. Therefore, the fractal dimension was found to be more effective index for the detection of the mycelial morphology and morphological change during batch cultivation. The circularity was also found to be useful for evaluating the surface growth of pelleted mycelium.

• Journal of Korean Society for Geospatial Information Science
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• v.18 no.2
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• pp.113-118
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• 2010

Recently, 3D-reconstruction for geographic information and study of geospatial information is progressing in various fields through national policy such as R&D business and pilot project. LiDAR system has a advantage of acquisition the 3D information data easily and densely so that is used in many different fields. Considering to characterist of the point data formed with 3D, it need a high specification CPU because it requires a number of processing operation for 2D form expressed by monitor. In contrast, 2D grid structure, like DEM, has a advantage on costs because of simple structure and processing speed. Therefore, purpose of this study is to solve the problem of requirement of more storage space, when LiDAR data stored in forms of 3D is used for 3D-geographic and 3D-buliding representation. Additionally, This study reconstitutes 2D-gird data to supply the representation data of 3D-geographic and presents the storage method which is available for detailed representation applying tree-structure and reduces the storage space.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.157-159
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• 2019

Hologram technology has been actively developed in terms of generation, transmission, and reproduction of 3D objects, but it is currently in a state of rest because of various limitations. Beyond VR and AR, the pseudo-hologram market is growing at an intermediate stage to meet the needs of new technologies. The key to the technology of hologram is to generate vast 3 dimensional data in the form of a point cloud, transmit the vast amount of data through the communication network in real time, and reproduce it like the original at the destination. In this paper, we propose a method to transmit massive 3 - D data in real - time and transmit the minutiae points of 3 - dimensional object information to reproduce the object as similar to original.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.70-72
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• 2001

최근 멀티미디어 응용의 증가에 따라 그래픽 데이터를 위한 내용 기반 검색 기술에 대한 연구가 활발히 진행되고 있다. 또한 인터넷 응용분야에서 3차원 그래픽 데이터베이스 사용의 필요성이 대두되고 활용되고 있다. 대부분의 3차원 그래픽 시스템은 사용자에게 그래픽은 검색이 대상이 아니라 단순히 보여주는 역할로 주로 사용되고 있다. 3차원 그래픽객체는 어떤 객체들로 구성되여 있으며 그들의 크기는 어떠한지 등의 정보를 포함하고 있다. 따라서 3차원 그래픽 객체에서는 2차원 그래픽 객체에서는 2차원 이미지보다 의미객체에 대한 정확한 정보를 더 많이 얻어 낼 수 있다. 이러한 사실 때문에 2차원 이미지의 특징추출의 방법과는 다른 형식의 접근이 필요하다. 본 논문에서는 3차원 그래픽으로 모델링 된 3차원 객체들을 대상으로 객체가 이루는 X, Y, Z축상의 비율과 윤곽형태에 대한 SPBT(Space Partitioning Binary Tree)의 결과값으로 특징을 추출하고 샘플 데이터를 통해서 이들간의 클러스터링과 실제 예제 질의를 토한 비교분석을 통해 객체간의 유사검색이 가능하도록 하는 특징추출 방법을 제안하였다. 본 논문에서는 제시한 모양기반 특징추출 방법은 웹상의 다양한 3차원 객체정보의 자동분류나 3차원 그래픽 데이터베이스를 위한 인덱스 구축 등에 활용될 수 있을 것이다.