• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권4호
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• pp.1673-1688
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• 2020

This paper presents a new method for improving teaching aids with the design and development of a chemistry education platform - the Mixed Reality (MR) Chemistry Lab. Our system provides a new educational experience in which students can simulate a chemistry experiment in a virtual lab and interact with objects using Oculus Helmet-Mounted Displays (HMD) and hand controller devices. The proposed system aims to familiarize students with experimental procedures and safety knowledge before conducting actual experiments. Moreover, students will be able to observe microscopic atomic structure models in three dimensions. Our research also includes a five-part, quantitative evaluation system user tests perform using a quantitative questionnaire consisting of five items, including hardware equipment, immersion, education, interaction sense of control, and degree of difficulty. The evaluation results confirm that this system will be helpful to the educational experience of conducting chemistry experiments with scientific evaluation methods, and the proposed system is also expected to have a broad range of applications in many other subjects.

• 전자통신동향분석
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• 제34권6호
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• pp.156-163
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• 2019

As a primitive immersive video technology, a three degrees of freedom (3DoF) $360^{\circ}$ video can currently render viewport images that are dependent on the rotational movements of the viewer. However, rendering a flat $360^{\circ}$ video, that is supporting head rotations only, may generate visual discomfort especially when objects close to the viewer are rendered. 3DoF+ enables head movements for a seated person adding horizontal, vertical, and depth translations. The 3DoF+ $360^{\circ}$ video is positioned between 3DoF and six degrees of freedom, which can realize the motion parallax with relatively simple virtual reality software in head-mounted displays. This article introduces the standardization trends for the 3DoF+ video in the MPEG-I visual group.

• 방송공학회논문지
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• 제22권5호
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• pp.600-607
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• 2017

VR (Virtual Reality)은 최근 스마트 폰 기반 HMD (Head Mounted Displays)에 대한 개발 및 관심이 급증 함에 따라 360 비디오에 대한 표준화에 대한 요구가 급증하고 있다. 본 논문에서는 MPEG 산하에서 진행되는 360 미디어를 지원하기 위한 미디어 포맷인 Omnidirectional Media Format 에서 다루는 핵심 표준 기술에 대하여 자세히 소개한다. 360 미디어를 위한 OMAF 아키텍처를 소개하고 OMAF 에서 다루는 360 비디오 처리 및 메타데이터에 대해 자세히 설명한다. 그리고 360 미디어를 파일 혹은 세그먼트 내에 저장하기 위한 미디어 포멧 및 MPEG DASH(Dynamic Adaptive Streaming over HTTP)기반 360 미디어에 대한 스트리밍 기법에 대해 자세히 언급한다.

• Current Optics and Photonics
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• 제1권5호
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• pp.474-490
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• 2017

Since the recent slowdown in the smartphone market, studies for wearable devices are briskly being carried out to find new markets, such as virtual reality devices. In this paper, a head-mounted display (HMD) which provides expanded virtual images before human eyes by enlarging images of a small display was designed, and the tolerance analysis method for a focus-adjustable HMD based on afocal optical systems was studied. There are two types of HMDs: a see-through type that allows the user to view the surroundings, and a see-close type where the user can only view the display screen; the former is used in this study. While designing the system, we allowed a lens within the system to be shifted to adjust its focus from +1 to -4 D (diopters). The yield of the designed systems was calculated by taking the worst-case scenario of a uniform distribution into account. Additionally, a longitudinal aberration was used rather than MTF for the tolerance analysis with respect to system performance. The sensitivity of the designed system was calculated by assigning a certain tolerance, and the focus lens shift was calculated to adjust the image surface variations resulting from the tolerance. The smaller the tolerance, the more expensive the unit price of the products. Very small tolerances may even be impossible to fabricate. Considering this, the appropriate tolerance was assigned; the maximum shift of the focus lens in which the image surface can be adjusted was obtained to find the changes in aberration and a good yield.

• 센서학회지
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• 제27권6호
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• pp.414-420
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• 2018

To augment emotion and immersion in virtual reality (VR), technological research based on scent displays have increased in recent years. The results of extensive studies have enabled the development of methods to interface head mounted displays (HMDs) with scent devices, and the possibility of VR applications of this development was identified via several demonstrations in actual VR environments. Despite all these efforts, more practical methods and conditions for scent display in VR environments are yet to be developed. To efficiently interface VR and scent, this study proposes three ways to set the position for scent display and scent conditions. The first is scent display using local positioning in the VR engine, the second is scent display using the relative distance and orientation between user and object in VR environments, and the third is scent display using time setting. In this study, we developed scent devices using a piezo actuator to validate the proposed method and successfully conducted demonstrations and experiments.

• Archives of Plastic Surgery
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• 제44권3호
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• pp.179-187
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• 2017

Recently, virtual reality (VR) and augmented reality (AR) have received increasing attention, with the development of VR/AR devices such as head-mounted displays, haptic devices, and AR glasses. Medicine is considered to be one of the most effective applications of VR/AR. In this article, we describe a systematic literature review conducted to investigate the state-of-the-art VR/AR technology relevant to plastic surgery. The 35 studies that were ultimately selected were categorized into 3 representative topics: VR/AR-based preoperative planning, navigation, and training. In addition, future trends of VR/AR technology associated with plastic surgery and related fields are discussed.

• 패션비즈니스
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• 제11권4호
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• pp.173-182
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• 2007

The concept of wearable computer says to be able to connect to network freely without restrict of place and time through the garment that contain the wire and circuit. Thereby we can realize the ubiquitous circumstances. Wearable computer plays a role of center in controlling the electronic equipments under the ubiquitous circumstances and also it will become the main stream of the future computer development. The current wearable computer displays ugly appearance by attaching the parts of computer on the garment instead of installing them in the box. However, as size of computer components are minimized and it's speed is getting faster, it is certain that wearable computer will evolve as fashionable computer, still retaining garment's original purpose such as fitting and fasion even though the computer is being installed to the clothing. This study reviewed about components, future market share, developed goods, human-being becoming cyborg, application area, restrict and on-going research of wearable computer.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.452-452
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• 2008

Abstract Head-mounted displays(HMD) are being developed and marketed in growing numbers for a variety of applications. Though most commonly associated with entertainment applications other applications are also being developed. The field vision on the display screens is expanded by the optical system producing an imaginary screen that appears to be positioned several meters in front of the viewer. In this study, the mold core for the prism lens of HMD was processed by fly-cutting method, and the form accuracy of the mold core was measured.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2019년도 하계학술대회
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• pp.176-177
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• 2019

360 도 VR (Virtual Reality) 영상을 기존의 비디오처럼 재생하고 전송하기 위해서는 아직까지도 논의 되어야할 많은 문제들이 존재한다. 특히 보는 장면에 비하여 전방위의 영상을 보내야하는 VR 영상은 매우 큰 용량을 가질 수 밖에 없다. 그럼에도 불구하고 사용자의 불편함을 덜기 위해서는 HMD (Head-Mounted Displays) 의 빠른 반응 속도가 필요하다. 따라서 QER (Quality Emphasized Region)기반의 전송 기법은 영역별로 차별화된 화질의 영상을 전송하여 실감미디어의 몰입감을 유지하고 대역폭의 낭비를 줄이는 뷰포트 적응적 360 도 비디오 스트리밍 시스템 (Viewport-Adaptive 360-Degree Video Streaming System)의 일종으로 제안되었다. 그러나, 사용자의 시점 정보를 계산하기 위해서는 매 프레임마다 차원 변환을 위한 복잡하고 많은 계산이 필요하고, 이러한 중복된 계산은 시스템의 성능을 저하시키는 요인이 될 수 있다. 본 논문에서는 이러한 차원 변환에 따른 자원낭비를 줄이기 위하여 QER 선택을 위한 개선 방법을 제안한다.

• Current Optics and Photonics
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• 제4권6호
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• pp.524-529
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• 2020

We propose a depth-fused-type three-dimensional (3D) near-eye display implemented using a birefringent lens set that is made of calcite. By using a birefringent lens and image source (28.70 mm × 21.52 mm), which has different focal lengths according to the polarization state of the incident light, the proposed system can present depth-fused three-dimensional images at 4.6 degrees of field of view (FOV) within 1.6 Diopter (D) to 0.4 D, depending on the polarization distributed depth map. The proposed method can be applied to near-eye displays like head-mounted display systems, for a more natural 3D image without vergence-accommodation conflict.