• Journal of the Korea Computer Graphics Society
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• v.10 no.3
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• pp.1-8
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• 2004

본 논문은 한 장 혹은 여러 장의 실세계의 사진 영상을 입력으로 받아 영상 기반 모델링 방법 중 하나인 영상 분할 모델링 방법을 통해 환경을 3차원으로 모델링을 하고 주어진 실세계 사진 영상을 비사실적 렌더링하여 환경 탐색시 환경맵으로 사용하도록 하여 비사실적 탐색 영상을 생성하는 방법을 제안하였다. 제안된 방법은 세밀한 3차원 환경 메쉬 모델을 생성하여 2차원 환경맵의 비사실적 랜더링 과정을 통해 비사실적 애니메이션 효과를 손쉽게 만들어 낼 수 있다는 장점을 가지고 있다. 또한, 환경맵의 비사실적 렌더링을 통한 환경 매핑방법으로 각 프레임 간의 유사성을 유지하며 렌더링하는 특징을 가지고 있어 자연스러운 비사실적 탐색 영상을 생성 할 수 있다.

• The Journal of the Convergence on Culture Technology
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• v.9 no.2
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• pp.581-587
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• 2023

During the global pandemic period, The world has created a new paradigm using digital technology, aligning one direction with the highest value of life and survival. Untact has changed from a convenience value to an essential value with quarantine and sanitation. And the industry process has shifted from face-to-face to non-face-to-face. The platform formed an community in a virtual space, and companies started a new service based on presence. For a sense of reality, information is expressed and stored from 2D centered on images to 3D multifaceted. Companies are marketing using 3D modeling, focusing on augmented reality, virtual world, and mirror world of Metaverses. The purpose of this study is to analyze the current status and examples of 3D modeling in the E-commerce environment of domestic and foreign jewelry brands in this era of change, and present ways to use 3D modeling in jewelry industries.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.6
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• pp.874-880
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• 2018

3D modeling is extensively used in the field of architecture, machinery and contents production such as movies. Modeling is a time-consuming task. In order to compensate for these drawbacks, attempts have recently been made to reduce the production period by applying 3D scanning technology. 3D scanning for small objects can be done directly with laser or optics, but large buildings and sculptures require expensive equipment, which makes it difficult to acquire data directly. In this study, 3D modeling data for a large object is acquired using photometry with using drones to acquire the image data. The maintenance method for uniform spacing between the sculpture and the drone, the measurement method for the flight line were presented. In addition, we presented a production environment that can utilize the obtained 3D point cloud data for animation and a rendered animation result to find ways to make it in various environments.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.210-214
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• 2008

It is actually impossible to model and store all objects which exist in real home environment into robot's database in advance. To resolve this problem, this paper proposes new object modeling method that can be available for robot self-modeling, which is capable of estimating whole model's shape from partial surface data using Generic Model. And this whole produce is conducted to cylindrical objects like cup, bottles and cans which can be easily found at indoor environment. The detailed process is firstly we obtain cylinder's initial principle axis using points coordinates and normal vectors from object's surface after we separate cylindrical object from 3D image. This 3D image is obtained from 3D sensor. And second, we compensate errors in the principle axis repeatedly. Then finally, we do modeling whole cylindrical object using cross sectional principal axis and its radius To show the feasibility of the algorithm, We implemented it and evaluated its accuracy.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.983-983
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• 2012

EFDC의 수질모형인 HEM3D는 국내 해양수질모델링에는 적용된 사례가 많지만 담수에 적용된 사례는 거의 없으며, 우리나라 환경부 수질측정항목과 수질 INPUT 자료가 달라서 모델의 적용이 힘들었다. 그러나 HEM3D는 EFDC 수리모델을 연계하는 WASP에 비해 자체 3차원 수리동역학 모델이 있어 셀 개수의 제한이 없고 계산속도 또한 WASP 보다 2~3배 빠른 것으로 알려져 있다. 그러나 현재 우리나라의 수질측정항목은 HEM3D의 수질모의항목과 다소 차이가 있다. 특히 Carbon계열에서 실측수질항목은 BOD, COD인 반면 HEM3D의 모의가능항목은 RPOC, LPOC, DOC, COD로 바로 적용을 하기는 어렵다고 판단하였다. 따라서 환경부 수질자료를 HEM3D에 적용하기위해 문헌자료를 참고한 수질항목간의 분율을 사용하여 필요한 자료를 산출하였고, 환경부 수질자료의 HEM3D적용 결과를 알아보고 현재 자료 사용 시의 문제점과 향후 개선방안을 알아보고자 하였다. HEM3D의 모의 결과 TN, TP 보정에는 큰 문제가 없었으나 $BOD_5$와 세부수질항목의 영향을 많이 받는 조류 등의 항목 보정결과는 성공적이지 못했다. 이것은 분율을 적용해 각 유입지천의 세부항목별 수질 자료를 산출할 때 낙동강 전체 평균을 사용했기 때문에 조류성장에 직접적으로 영향을 받는 세부 항목별 영양염에 대한 실제 값과 산출된 농도 값 사이의 오차가 가장 큰 원인으로 판단된다. 한편 전체 대상지역중 일부구간에 대하여 동일한 수질입력자료를 이용하여 HEM3D와 WASP을 동시 적용하였다. 자료의 변환과정에서의 오차와 입력형태 및 각 모델 변수형태의 차이 등의 한계로 결과값에 차이가 있는 것으로 나타났으며, 본 연구결과 현재 확보된 수질측정망의 수질자료를 이용하여 HEM3D를 구축하는 것은 Carbon 계열과 조류(부영양화)모의에서 문제가 발생할 것으로 판단되며 추가 자료 확보가 필요할 것으로 보인다. 또한 필요한 입력자료가 충분히 확보가 된다면 추가연구결과에서 볼 수 있듯이 미국공변단과 미국 환경부수질모델 모두 동시적용이 가능하다고 판단되며 목적과 편의에 따라 선택적 모의가 가능하다고 판단된다.

• 한국지구물리탐사학회:학술대회논문집
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• 2009.10a
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• pp.75-80
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• 2009

Despite its flexibility to complex geometry, three-dimensional (3D) electromagnetic(EM) modeling schemes using finite element method (FEM) have been faced to practical limitation due to the resulting large system of equations to be solved. An efficient 3D FEM modeling scheme has been developed, which can adopt either direct or iterative solver depending on the problems. The direct solver PARDISO can reduce the computing time remarkably by incorporating parallel computing on multi-core processor systems, which is appropriate for single frequency multi-source configurations. When limited memory, the iterative solver BiCGSTAB(1) can provide fast and stable convergence. Efficient 3D simulations can be performed by choosing an optimum solver depending on the computing environment and the problems to be solved. This modeling includes various types of controlled-sources and can be exploited as an efficient engine for 3D inversion.

• Journal of Korea Multimedia Society
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• v.16 no.1
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• pp.108-118
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• 2013

Recently the 3D modeling techniques were developed rapidly due to rapid development of computer vision, computer graphics with the excellent performance of hardware. With the advent of a variety of 3D contents, 3D modeling technology becomes more in demand and it's quality is increased. 3D face models can be applied widely to such contents with high usability. In this paper, a 3D face modeling is attempted from a given single 2D frontal face image. To achieve the goal, we thereafter the feature points using AAM are extracted from the input frontal face image. With the extracted feature points we deform the 3D general model by 2-pass mesh warping, and also the depth extraction based on intensity values is attempted to. Throughout those processes, a universal 3D face modeling method with less expense and less restrictions to application environment was implemented and it's validity was shown through experiments.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.6
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• pp.2551-2562
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• 2013

Since 2006, an Intelligent Excavation Robot which automatically performs the earth-work without operator has been developed in Korea. The technologies for automatically recognizing the terrain of work environment and detecting the objects such as obstacles or dump trucks are essential for its work quality and safety. In several countries, terrestrial 3D laser scanner and stereo vision camera have been used to model the local area around workspace of the automated construction equipment. However, these attempts have some problems that require high cost to make the sensor system or long processing time to eliminate the noise from 3D model outcome. The objectives of this study are to analyze the advantages of the existing 3D modeling sensors and to examine the applicability for practical use by using Analytic Hierarchical Process(AHP). In this study, 3D modeling quality and accuracy of modeling sensors were tested at the real earth-work environment.

• Journal of the Korea Computer Graphics Society
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• v.3 no.1
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• pp.17-22
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• 1997

This paper presents a new modeling technique to reconstruct road environments. The reconstruction algorithm for road environments consists of three parts - reconstructing 3D models of architectures in road environments, editing and creating road models, and modeling auxiliary objects. Different modeling technique is applied to each of these three parts according to properties objects to be modeled contain. In this reconstruction system, modified Photogrammetric Modeling techique is used, of which the user interface is more convenient, and in which constraints of road environments are considered. These improvements make this road environment reconstruction system much simpler and easier to use compared with Photogrammetric Modeling technique[1, 2].

• Journal of radiological science and technology
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• v.39 no.2
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• pp.257-262
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• 2016

This study aimed to suggest a novel method of modeling a hearing aid ear shell based on Digital Imaging and Communication in Medicine (DICOM) in the hearing aid ear shell manufacturing method using a 3D printer. In the experiment, a 3D external auditory meatus was extracted by using the critical values in the DICOM volume images, and the modeling surface structures were compared in standard type STL (STereoLithography) files which could be recognized by a 3D printer. In this 3D modeling method, a conventional ear model was prepared, and the gaps between adjacent isograms produced by a 3D scanner were filled with 3D surface fragments to express the modeling structure. In this study, the same type of triangular surface structures were prepared by using the DICOM images. The result showed that the modeling surface structure based on the DICOM images provide the same environment that the conventional 3D printers may recognize, eventually enabling to print out the hearing aid ear shell shape.