• Annual Conference of KIPS
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• 2016.04a
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• pp.778-780
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• 2016

가상 혼합현실은 현재 가장 큰 관심을 받고 있는 연구 분야 중 하나이다. 하지만 아직 가상 혼합현실에 대한 정형화된 표준이 없는 상태에서 여러 가지 가상 혼합현실 기기들이 나오고 있다. 따라서 본 논문에서는 이미 상용화되었거나 곧 상용화 될 기기들에 대한 비교 분석을 수행한다. 그리고 정리한 내용을 토대로 가상 혼합현실 기기들의 동향 및 발전 전망을 살펴본다.

• Journal of Information Processing Systems
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• v.17 no.4
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• pp.737-753
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• 2021

As the demand for high-quality rendering for mixed reality, videogame, and simulation has increased, global illumination has been actively researched. Monte Carlo path tracing can realize global illumination and produce photorealistic scenes that include critical effects such as color bleeding, caustics, multiple light, and shadows. If the sampling rate is insufficient, however, the rendered results have a large amount of noise. The most successful approach to eliminating or reducing Monte Carlo noise uses a feature-based filter. It exploits the scene characteristics such as a position within a world coordinate and a shading normal. In general, the techniques are based on the denoised pixel or sample and are computationally expensive. However, the main challenge for all of them is to find the appropriate weights for every feature while preserving the details of the scene. In this paper, we compare the recent algorithms for removing Monte Carlo noise in terms of their performance and quality. We also describe their advantages and disadvantages. As far as we know, this study is the first in the world to compare the artificial intelligence-based denoising methods for Monte Carlo rendering.

• Annual Conference of KIPS
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• 2013.05a
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• pp.303-306
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• 2013

실제공간체감을 극대화하기 위해 실제 물리적인 공간과 가상현실 공간을 융합하는 인터랙티브 아키텍쳐 기반 적응형 혼합현실 기술이 최근 연구되고 있다. 이러한 혼합현실 공간에서 동적인 사용자 위치에 따라 물리공간적 몰입감 증대를 위한 오디오 Sweet Spot 최적화 기술을 연구하였다. 이를 위해 주파수 대역 별 소리의 물리적 감쇠현상을 활용하여 주파수 별 오디오 신호 보상 전처리를 통해 동적인 사용자 위치에 원음과 동일한 음색의 오디오 Sweet Spot이 형성이 가능한지 실험한 결과 주파수 별 감쇠의 차이를 보정함으로써 원음 그대로의 음색이 재현될 수 있다는 것을 확인할 수 있었다.

• Annual Conference of KIPS
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• 2013.11a
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• pp.1567-1570
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• 2013

최근 혼합현실 기반의 다양한 콘텐츠의 생산이 활성화 되고 있다. 이러한 콘텐츠는 실세계의 촬영 영상과 가상의 영상을 합성하는 기법으로 이를 위해서는 실세계의 촬영 영상과 마커 또는 생체 정보등의 객체를 이용하여 영상 합성을 통하여 구현되는 것이 일반적이다. 본 논문에서는 이러한 혼합영상에서의 가상영상 합성을 위해 스테레오 카메라를 이용, 영상의 객체 깊이를 측정하는 시스템을 구현한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.8
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• pp.1255-1258
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• 2022

Recently, immersive VR/AR contents have actively increased, and various services related to VR/AR allow users to experience remote places. For example, if failure situations occur frequently in factory of the remote site, mixed reality (MR) with a synthetic virtual human expert in reconstructed remote location can help immediate maintenance task with interaction between the operator and the virtual expert. In this paper, we present a technique for synthesizing the virtual human after capturing a 360-degree panorama of a remote environment, and analyze the effects to apply a method of guiding virtual human by interaction types. According to this paper, it was shown that co-presence level significantly increased when verbal, facial expression, and non-verbal animation of the virtual human was all expressed.

• Smart Media Journal
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• v.11 no.6
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• pp.30-36
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• 2022

This paper explored the effect of using eye gaze pointer in addition to the hand gesture visual communication cue in remote collaboration. We recruited 24 participants and conducted a user study comparing two conditions: (1) only hand gesture visual communication cue, and (2) eye gaze pointer with hand gesture visual cue. The results showed that the added eye gaze pointer cue reduced the workload and increased the co-presence when using it together with hand gesture cue.

• International Journal of Advanced Culture Technology
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• v.11 no.1
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• pp.18-26
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• 2023

The use of holographic standardized patient (HSP) with mixed reality can provide students with the opportunity to enhance clinical reasoning skills. This is still relatively new, so there is a lack of guidelines for educators. Thus, we aimed to develop the instructional model of HSP-based education, for enhancing clinical reasoning skills in undergraduate healthcare education, which could systematically guide educators in designing and implementing HSP-based teaching and learning activities appropriately. Using a design and development research, a theoretically constructed initial mode in this study was iteratively improved and underwent validation through expert review and model usability test. Features of the model were discussed, along with theoretical and practical implications and suggestions for further research.

• Journal of Contemporary Eastern Asia
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• v.21 no.2
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• pp.1-12
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• 2022

A good story persuades people to act. The mobilizing power of a story, however, does not necessarily rely on informational fidelity. During political unrests, word-of-mouth can intermix facts with unverified claims and emotional outrage, often transforming reality into convincing rumor stories. This rapid communication article discusses how rumor publics (dis)approve and participate in 2019 Hong Kong Protests. This survey study finds that police injustice and brutality were the predominant themes of the collected rumor stories, although some stories contained mixed views or anti-protest claims. Rumors of police injustice and brutality were associated with less negative attitudes toward the protests, especially when respondents believed the story. The relationship between rumor stories and protest participation was less obvious, except for rumors about an individual protester's whereabout. This study discusses the ways in which rumor is embedded in contentious political processes.

• Annual Conference on Human and Language Technology
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• 2019.10a
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• pp.60-63
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• 2019

사용자와 자연어 음성을 통해 상호작용하는 대화 시스템이 주목받고 있다. 음성 뿐 아니라, 화면을 통해 사용자와 상호작용하는 기능을 제공하는 대화 시스템들이 소개되고 있으며, 최근에는 혼합 현실 환경에서 대화 에이전트가 실제 공간에 존재하는 서비스가 소개되기도 하였다. 본 연구에서는 혼합 현실 환경의 대화 시스템이 현실 세계에 영향을 미칠 수 있는 시스템을 설계하였다. 제안하는 시스템은 서버가 클라이언트와 통신하여 필요 시 적절한 장치를 제어하도록 설계되었다. 본 연구 시스템의 실현가능성을 입증하기 위해 라즈베리파이를 제어할 장치로 사용하였으며, 화면에 보이는 대화 에이전트에게 음성으로 명령하여 전등, 에어컨 등을 제어하는 것이 가능함을 확인하였다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.47 no.2
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• pp.65-73
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• 2024

This paper presents a path planning optimization model for the engineering units to install obstacles in the shortest time during wartime. In a rapidly changing battlefield environment, engineering units operate various engineering obstacles to fix, bypass, and delay enemy maneuvers, and the success of the operation lies in efficiently planning the obstacle installation path in the shortest time. Existing studies have not reflected the existence of obstacle material storage that should be visited precedence before installing obstacles, and there is a problem that does not fit the reality of the operation in which the installation is continuously carried out on a regional basis. By presenting a Mixed Integrer Programming optimization model reflecting various constraints suitable for the battlefield environment, this study attempted to promote the efficient mission performance of the engineering unit during wartime.