• 한국정보통신학회논문지
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• 제18권11호
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• pp.2799-2804
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• 2014

본 논문에서는 집적 영상 기술을 사용하여 3차원 정보를 추출하는 지도 시스템을 제안한다. 집적 영상 기술은 렌즈 배열을 가지는 2차원 영상 획득장치를 사용하여 다수의 서로 다른 원근감을 가지는 요소 영상을 기록하고 이를 이용하여 3차원 정보를 획득하고 디스플레이하는 기술이다. 본 논문에서는 각 요소 영상간의 위치 차이를 절대 차이의 합 (Summation of Absolute Difference: SAD)를 사용하여 구하고 이를 이용하여 3차원 정보를 추출한다. 따라서, 3차원 물체의 높이 정보를 구할 수 있다.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2008년도 춘계학술대회 논문집
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• pp.445-446
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• 2008

• Journal of information and communication convergence engineering
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• 제15권3호
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• pp.193-198
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• 2017

In this study, we propose a three-dimensional (3D) visualization technique of occluded objects using integral imaging with a plenoptic camera. In previous studies, depth map estimation from elemental images was used to remove occlusion. However, the resolution of these depth maps is low. Thus, the occlusion removal accuracy is not efficient. Therefore, we use a plenoptic camera to obtain a high-resolution depth map. Hence, individual depth map for each elemental image can also be generated. Finally, we can regenerate a more accurate depth map for 3D objects with these separate depth maps, allowing us to remove the occlusion layers more efficiently. We perform optical experiments to prove our proposed technique. Moreover, we use MSE and PSNR as a performance metric to evaluate the quality of the reconstructed image. In conclusion, we enhance the visual quality of the reconstructed image after removing the occlusion layers using the plenoptic camera.

• 한국정보통신학회논문지
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• 제16권9호
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• pp.2037-2042
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• 2012

Synthetic aperture 집적 영상 (SAII) 기술은 다수의 카메라를 이용하여 고해상도의 요소 영상을 획득할 수 있는 유망한 3D 이미징 기술이다. 본 논문에서는 SAII 기술을 이용하여 집적 영상 디스플레이를 수행하는 공간 3D 영상을 표시하는 방법을 제안한다. SAII로부터 얻어지는 요소 영상은 직접적으로 공간 3D 영상으로 사용될 수 없기 때문에 깊이 지도를 추출하여 새로운 디스플레이용 요소 영상으로 변환하여 공간 3D 영상을 표시한다. 제안하는 방법의 유용함을 보이기 위해서 장난감 3D 물체를 사용하여 기초적인 실험을 수행하고, 또한 공간 3D 영상이 구현된 실험 결과를 제시한다.

• Journal of the Optical Society of Korea
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• 제17권5호
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• pp.410-414
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• 2013

In this paper, we propose a 3D display method combining a pickup process using axially recorded multiple images and an integral imaging display process. First, we extract the color and depth information of 3D objects for displaying 3D images from axially recorded multiple 2D images. Next, using the extracted depth map and color images, elemental images are computationally synthesized based on a ray mapping model between 3D space and an elemental image plane. Finally, we display 3D images optically by an integral imaging system with a lenslet array. To show the usefulness of the proposed system, we carry out optical experiments for 3D objects and present the experimental results.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.105.1-105.1
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• 2016

Many of the complex materials developed today derive their unique properties from the presence of multiple phases or from local variations in elemental concentration. Simply performing analysis of the bulk materials is not sufficient to achieve a true understanding of their physical and chemical natures. Secondary ion mass spectrometer (SIMS) has met with a great deal of success in material characterization. The basis of SIMS is the use of a focused ion beam to erode sample atoms from the selected region. The atoms undergo a charge exchange with their local environment, resulting in their conversion to positive and negative secondary ions. The mass spectrometric analysis of these secondary ions is a robust method capable of identifying elemental distribution from hydrogen to uranium with detectability of the parts per million (ppm) or parts per billion (ppb) in atomic range. Nano secondary ion mass spectrometer (Nano SIMS, Cameca Nano-SIMS 50) equipped with the reactive ion such as a cesium gun and duoplasmatron gun has a spatial resolution of 50 nm which is much smaller than other SIMS. Therefore, Nano SIMS is a very valuable tool to map the spatial distribution of elements on the surface of various materials In this talk, the surface imaging applications of Nano SIMS in KBSI will be presented.

• Journal of the Optical Society of Korea
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• 제16권4호
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• pp.381-385
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• 2012

In this paper, we present a novel integral imaging pickup method. We extract each pixel's actual depth data from a real object's surface using a depth camera, then generate elemental images based on the depth map. Since the proposed method generates elemental images without a lens array, it has simplified the pickup process and overcome some disadvantages caused by a conventional optical pickup process using a lens array. As a result, we can display a three-dimensional (3D) image in integral imaging. To show the usefulness of the proposed method, an experiment is presented. Though the pickup process has been simplified in the proposed method, the experimental results reveal that it can also display a full motion parallax image the same as the image reconstructed by the conventional method. In addition, if we improve calculation speed, it will be useful in a real-time integral imaging display system.

• 한국CDE학회논문집
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• 제3권3호
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• pp.161-167
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• 1998

Cutting forces in ball-end milling of slanted surfaces are calculated. The cutting area is determined from the Z-map of the surface geometry and current cutter location. The obtained cutting area is projected onto the cutter plane normal to the Z-axis and compared with cutting edge element location. Cutting force is calculated by integration of elemental cutting forces of engaged cutting edge elements. Experiments with various slanted angles were performed to verify the proposed cutting force estimation model. It is shown that the proposed method predicts cutting force effectively for any geometry including sculptured surfaces with cusp marks and surfaces with pockets and holes.

• International journal of advanced smart convergence
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• 제11권2호
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• pp.83-87
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• 2022

Genshin Impact is an open-world action role-playing game launched by miHoYo in 2020 and has been released on multiple platforms. Due to the excellent character design, it has received widespread attention once it was released, and it has been ranked in the top 10 best-selling lists in several countries after a few weeks of launch. This article will first analyze the map design of the game's open world, and what elements are used on the game map to allow players to immerse themselves in it. Then, in the gameplay of the game, a rich and varied combat system is formed by using the relationship between the elements to restrain each other.There is also a card drawing system added to it, which makes the acquisition of characters full of randomness and allows more players to participate in it. It is concluded that the novel design and rich and varied play methods have made the game Genshin Impact high in popularity, occupying the forefront of the app download list for a long time.

• 한국지반공학회논문집
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• 제15권5호
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• pp.217-228
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• 1999

본 논문에서는 절리암반에서 발생하는 지하수 유동과 굴착된 지하공동으로의 지하수 유입량을 해석하는 대표체적법, 비대표체적법 및 절리망 해석법을 소개하고 절리의 수와 공동의 직경을 변화시키면서 각 해석법의 특징과 결과를 비교하였다. 선처리 과정으로서 다수의 절리가 서로 교차하는 절리암반의 등가 수리전도계수를 산정하는 이론과 계산 과정(일명, 순차적 해석)이 소개되었다. 유한요소망과 절리도 및 순차적 해석을 이용하여 445개 요소 각각의 등가 수리전도계수를 계산하였으며 절리암반의 비균질 수리전도성과 대표물성 결정에 관해 논의하였다. 대표체적법에서는 대표물성을 통해 절리암반의 균질화가 이루어졌으며 따라서 절리밀도, 공동의 직경 및 수리전도대비의 증가에 따른 지하수 유입량의 증가도 규칙적이며 일관성 있는 경향을 보였다. 비대표체적법에서는 암반의 비균질성이 요소 단위로 해석에 반영됨으로써 유입량의 변화 양상은 불규칙하였으나 특성 치수가 증가함에 따라 대표체적법의 결과에 접근하는 경향을 보였다. 절리망 해석은 절리밀도, 공동크기 및 절리망과 공동의 교차 여부 등에 가장 민감하게 반응하였으나 해석결과의 신뢰도가 개별 절리에 관한 자료에 너무 의존하게 되는 단점이 있다. 제한된 범위에서 수집될 수밖에 없는 현장 절리자료의 불확실성을 감안할 때 대표체적법과 비대표체적법이 실질적으로 더 합리적인 해석방법으로 인식되었다.