• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.577-580
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• 2022

본 논문에서는 마이크로소프트(Microsoft, MS) 홀로렌즈v2를 이용하여 물리 기반 애니메이션은 유체와 로프를 제어할 수 있는 새로운 방법에 대해 소개한다. 물리 기반 시뮬레이션 혼합현실, 메타버스, 게임 등 다양한 콘텐츠에서 몰입감을 개선하기 위해 활용되고 있는 기술이다. 하지만, 계산양이 크고 사용자가로 인한 직관적인 제어 시스템의 부재로 많은 시장에 활용되기에는 어려운 구조이다. 이러한 문제를 완화하기 위해 본 논문에서는 혼합현실 환경에서 무선으로 사용자 인터페이스를 구현한 홀로렌즈v2를 이용하여 물리 애니메이션을 제어하고자 한다. 이러한 도전은 혼합현실에서도 사용자의 손동작, 음성, 눈 추적 등 다양한 인터페이스를 통해 시뮬레이션을 제어할 수 있다는 가능성을 열어줌으로써, 관련시장도 확장 될 수 있다. 본 논문에서는 대표적으로 유체와 로프 시뮬레이션을 홀로렌즈를 통해 제어하는 결과를 보여준다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.584-586
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• 2022

In this paper, we proposed an augmented reality(AR) service for the Great Gilt-bronze Incense Burner of Beakje - one of Korea's national treasures - using smart glasses. The proposed AR service was developed using Microsoft's HoloLens 2, MRTK, and Unity programs. The proposed service starts when the user wears HoloLens 2 and looks at a QR code next to the displayed the Great Gilt-bronze Incense Burner. Then, the proposed service visually provides users with the historical explanation of the Great Gilt-bronze Incense Burner and the objects in it. In particular, the proposed service augments virtual 5 musicians of the Great Gilt-bronze Incense Burner so that users can experience the performance culture of the Baekje era. Therefore, we can provide users with the value and meaning of the cultural heritage of the Baekje era as an expanded experience by using the virtual 5 musicians to overcome the current temporal and spatial constraints. We can confirm whether the proposed AR service is provided to users through HoloLens 2, in harmony with the Great Gilt-bronze Incense Burner of Baekje, a cultural heritage.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.83-85
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• 2017

Generally, the current organ projection systems are the MRI and the CT. The MRI and the CT, (MRI) allow the surgeon to see the internal organs without incising the human body. However, since the images generated by the machines are 2D, it is difficult for doctors to observe the internal organs in three dimension. In this paper, we develop the augmented projection system for internal organs by using the augmented reality technology. The developed system shows the internal organs of the body using a holographic lens as a stereoscopic image and allows for doctors to examine the internal organs in detail.

• Korean Journal of Optics and Photonics
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• v.5 no.3
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• pp.372-378
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• 1994

A simple 2-step astigmatic rainbow holography method using the characteristics of holographic aberration is proposed. Point sources are used to record and reconstruct primary hologram. When the primary hologram is reconstructed, object image is divided into two components by the holographic astigmatism. This characteristics of holographic astigmatism and cylindrical lens power are used to obtain rainbow hologram of sharp image, no matter how far from the hologram the obseved image locates, in front of the hologram. And this hologram has optimum viewing distance long enough.enough.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.571-572
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• 2020

3D 디스플레이 산업에 있어서 홀로그램의 상용화는 여전히 많은 문제점을 가지고 있다. Computer Generated Hologram(CGH)은 홀로그램 분야 중에서도 3D 물체를 생성하는데 여러 가지 강점을 가지고 있지만 큰 해상도를 가진 CGH를 생성하는데 많은 연산시간이 걸려 상업화에 걸림돌이 되고 있다. 이 논문에서는 이를 해결하기 위하여 오목 렌즈 함수를 이용한 초 고해상도 CGH를 생성하는 알고리즘을 이용하여 초 고해상도 홀로그램을 생성하는 방법을 제안하였다. 초 고해상도 CGH를 생성하기 위하여 필요한 일반적인 방법으로 실제로 계산해야 될 CGH의 크기는 4 메가픽셀(2k X 2k) 수준의 저해상도로서, 저사양의 컴퓨터로서도 충분히 빠르고 부담 없이 계산해낼 수 있는 사이즈이다. 생성된 CGH로 Array를 형성한 후, 해당 위치에 알맞은 임의의 오목 렌즈 함수를 곱해줌으로서 임의의 크기 및 복원 거리를 가지는 초고해상도 CGH를 생성할 수 있음을 확인하였다.

• Korean Journal of Optics and Photonics
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• v.10 no.2
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• pp.128-137
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• 1999

We found the point-spread function (PSF) including the recording and reconstruction systems of the modified triangular interferometer. We also derived the resolutions of the modified and Cochran's triangular interferometers, then the resolutions of both systems for amplification factor, wavelength, and hologram size were found and analyzed. Also, to demonstrate the feasibility of incoherent holography, the formation of an incoherent hologram using a mercury lamp and its optical reconstruction were presented.

• Journal of the Korea Society of Computer and Information
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• v.26 no.4
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• pp.39-46
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• 2021

In this paper, we propose a method for the motion recognition method required in the industrial field in mixed reality. In industrial sites, movements (grasping, lifting, and carrying) are required throughout the upper full-body, from trunk movements to arm movements. In this paper, we use a method composed of sensors and wearable devices that are not vision-based such as Kinect without using heavy motion capture equipment. We used two IMU sensors for the trunk and shoulder movement, and used Myo arm band for the arm movements. Real-time data coming from a total of 4 are fused to enable motion recognition for the entire upper body area. As an experimental method, a sensor was attached to the actual clothes, and objects were manipulated through synchronization. As a result, the method using the synchronization method has no errors in large and small operations. Finally, through the performance evaluation, the average result was 50 frames for single-handed operation on the HoloLens and 60 frames for both-handed operation.

• Korean Journal of Optics and Photonics
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• v.12 no.1
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• pp.61-66
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• 2001

Defocused Fourier plane holograms are stored in disk-type holographic memories where thin recording media are used, the areal storage density per hologram and the intensity uniformity of the signal beam at the recording plane are studied. As the pixel pitch of the spatial light modulator that represents binary data increases, the storage density per hologram increases if exact Fourier holograms are stored. When defocused Fourier plane holograms are stored, however, we show that there exists an optimal pixel pitch that maximizes the area storage density per hologram in general, to increase the areal storage density per hologram, f/# of the Fourier transform lens that focuses the data image should be as small as possible. In this case, not only the intensity distribution at the recording plane but also the recording area becomes very sensitive to the degree of defocusing. Therefore, even if the exact Fourier plane holograms are stored, the defocusing effect owing to the medium thickness should be taken into account to achieve the maximal areal storage density per hologram.logram.

• Korean Journal of Optics and Photonics
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• v.18 no.2
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• pp.117-121
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• 2007

A fundamental problem in the in-line digital holography microscope is that the real image and virtual image and zero-order image are not separated spatially. In this paper, we have eliminated the zero-order noise by an averaging method and the twin image is divided using a geometrical set-up in an in-line digital holographic microscope. The size of the virtual image depends on the distance between the objective lens and the hologram plane and on the distance between the hologram plane and the image plane. We found that the virtual image size is smallest when the distance between the objective lens and the hologram plane is equal to the back focal length of the objective lens. We could divide the virtual image and real image by controlling the distance between the hologram plane and the objective lens.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.423-424
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• 2023

본 논문에서 우리의 HMD는 Microsoft의 HoloLens 2와 국내 XR 기업을 비롯한 AR, XR을 이용하여 박물관 관람 지원 콘텐츠를 제시하고자 한다. 증강현실과 더불어 확장 현실의 기술 확장을 보이며 사용자는 박물관이란 공간 내에서 HMD를 착용하고 관람하며 설명 판에 QR코드를 인식하여 인터페이스와 더불어 각 주제에 맞는 애니메이션을 제공하여 시각적으로의 추가적 요소를 제공한다. 또한 사용자가 기존의 일반적이던 박물관 관람에서 XR이란 새로운 기술의 융합을 접목함으로 시각적 흥미를 갖게 하고 지역마다 특수한 역사, 배경에 맞춘 콘텐츠로서 지역을 알려 더 넓게 사회문제의 하나인 인구 저하에 따른 지역소멸에 지역홍보 차원이나 콘텐츠의 제공, 나아가 XR의 상용화까지 기대할 수 있는 콘텐츠를 기대한다.