• Journal of radiological science and technology
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• v.44 no.6
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• pp.591-597
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• 2021

In the present study, we developed virtual reality education contents for radiation generator on radiation education field. The radiation generator was divided by module and even the X-ray exposure part was manufactured in detail for designing 3D models. The mechanical details of the X-ray exposure part, the function of adjusting field size of the X-ray, the function of moving the exposure part, and the demonstrating the principle of the X-ray tube were applied. For developing VR contents, the Unreal Engine was used. To evaluate the usefulness of virtual reality content, we used t-test by SPSS. The group used the simulator showed significantly higher levels of understanding of X-ray generation, X-ray irradiation unit composition, irradiation field size adjustment, irradiation unit position adjustment, and overall composition and function. We believe that this VR contents will be used well with radiation safe environment.

• International journal of advanced smart convergence
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• v.12 no.1
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• pp.130-139
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• 2023

With the increasing popularity of computer-generated virtual influencers, the trend is rising especially on social media. Famous virtual influencer characters Lil Miquela and Imma were all created by CGI graphics workflows. The process is typically a linear affair. Iteration is challenging and costly. Development efforts are frequently siloed off from one another. Moreover, it does not provide a real-time interactive experience. In the previous study, a real-time graphic workflow was proposed for the Digital Actor Hologram project while the output graphic quality is less than the results obtained from the CGI graphic workflow. Therefore, a real-time engine graphic workflow for Virtual Influencers is proposed in this paper to facilitate the creation of real-time interactive functions and realistic graphic quality. The real-time graphic workflow is obtained from four processes: Facial Modeling, Facial Texture, Material Shader, and Look-Development. The analysis of performance with real-time graphical workflow for Digital Actor Hologram demonstrates the usefulness of this research result. Our research will be efficient in producing virtual influencers.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.291-292
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• 2020

본 논문에서는 가상현실 콘텐츠 구현에 널리 사용되고 있는 unreal engine4를 사용하여 모션 트래커를 이용한 가상현실 드럼 연주 게임을 제작하였다. 현재 4차 산업 혁명 시대에서 가상현실 기술을 이용한 다양한 응용분야가 나타나고 있고 그중에서 체감형 콘텐츠가 몰입감을 높일 수 있다. 가상현실에서 더 많은 모션을 구현할 수 있도록 모션 트래커를 이용한 악기를 연주하는 것은 거의 없다. 그래서 모션 트래커를 이용한 게임 콘텐츠를 제작하여 드럼 악기를 몰입감 있게 게임 형태로 연주하는 체감형 게임을 개발하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.01a
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• pp.271-272
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• 2023

본 논문에서는 게임 개발 플랫폼인 언리얼 엔진 4를 사용하여 동작 인식 기반 복싱 게임 콘텐츠를 개발하였다. Google 사의 미디어파이프(MediaPipe) 오픈소스를 통해 웹캠으로 플레이어의 동작을 인식하며, 미디어파이프의 Pose Landmarks를 기준으로 게임 내의 캐릭터와 매핑하여 캐릭터 동작을 제어하여 복싱 게임에 대한 동작, 자세, 반응속도 등을 연습할 수 있는 콘텐츠를 즐길 수 있다. 제안한 동작 인식 기반 게임은 MediaPipe 기술을 이용하여 자신의 동작으로 게임 캐릭터를 제어하여 더 강한 몰입감을 느낄 수 있고, 비싼 VR 기기들 없이 웹캠만 있으면 어디서든 즐길 수 있고, 다양한 콘텐츠를 싼 가격에 즐길 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.35-36
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• 2023

Unreal Engine 5의 Level Streaming 기능은 플레이어가 플레이 도중 메모리에 Map을 로드/언 로드하는 등의 작업을 처리하는 기능이다. 이때 Level Streaming은 커다란 Map의 당장 필요한 부분에만 메모리에 로드하고, 렌더링하여 특히 Seamless Open world 장르에서 많이 사용된다. 본 논문에서 제안하는 방식은 이 Level Streaming 기능을 이용하여 현재 개발 진행 중인 Rogue-Like 장르 게임에서 비동기 방식의 로딩 화면과 Stage 전환을 통해 좀 더 부드러운, 즉 더 높은 Frames per Second(fps)를 플레이어에게 제공하기 위한 새로운 스테이지 시스템의 구현방식을 연구한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.437-438
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• 2023

본 논문에서는 리얼타임 3D 콘텐츠 제작 툴인 언리얼 엔진을 활용하여 1인칭의 게임을 제작한다. 이때 플레이어의 동선을 관리함에 있어 개발자의 의사를 직접 전달하지 않고 게임 속 시청각적인 연출을 통해 간접적으로 플레이어에게 동선을 제안 혹은 제한하는 방법을 정리하고 제시함으로써 플레이어의 몰입감을 향상시키고자 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.163-164
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• 2023

실시간 3D 렌더링 게임의 제작 환경에서 캐릭터의 움직임은 모션 캡처(motion capture)를 통해 만들거나 애니메이터에 의해 제작된다. 걷기나 달리기 등 일정한 속도로 캐릭터가 움직이는 모션은 캐릭터가 제자리(in place)에서 움직이도록 한 뒤에 게임에서 프로그램에 의해 일정한 속도로 움직임으로써 구현할 수 있다. 하지만 일정하지 않은 속도로 움직이는 모션을 같은 방식으로 적용하면 캐릭터의 이동이 어색해진다. 이런 어색함을 보완하기 위해 언리얼이나 유니티 3D 등의 엔진에서는 루트 모션(root motion) 기능을 사용하고 있다. 그런데 루트 모션을 위한 계층 구조는 애니메이터의 작업 효율을 위한 계층 구조와 다른 측면이 있다. 본 논문에서는 3ds Max를 사용하여 애니메이터 친화적이고 루트 모션에도 적합한 캐릭터 리깅을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.731-732
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• 2023

언리얼 엔진 기반의 메타버스나 실시간 게임 환경에서 캐릭터의 맞춤형 동작이 필요한 경우가 있다. 본 논문은 모션 디퓨전 모델을 활용하여 특정 동작을 자동 생성하는 기능을 제공하는 언리얼 엔진 플러그인을 제시한다. 특히 사용자가 텍스트로 신체 동작이나 감정 표현을 기술해 입력값으로 제공하면 서버에서 모션 디퓨전 모델로 애니메이션을 실시간으로 생성한 후, 언리얼엔진 클라이언트에서 후처리하여 사용자의 캐릭터에 실시간으로 적용하는 방식으로 구현했다.

• Journal of Intelligence and Information Systems
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• v.14 no.3
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• pp.59-76
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• 2008

In this paper, we propose an agent architecture called L-CAA that is quite effective in real-time dynamic environments. L-CAA is an extension of CAA, the behavior-based agent architecture which was also developed by our research group. In order to improve adaptability to the changing environment, it is extended by adding reinforcement learning capability. To obtain stable performance, however, behavior selection and execution in the L-CAA architecture do not entirely rely on learning. In L-CAA, learning is utilized merely as a complimentary means for behavior selection and execution. Behavior selection mechanism in this architecture consists of two phases. In the first phase, the behaviors are extracted from the behavior library by checking the user-defined applicable conditions and utility of each behavior. If multiple behaviors are extracted in the first phase, the single behavior is selected to execute in the help of reinforcement learning in the second phase. That is, the behavior with the highest expected reward is selected by comparing Q values of individual behaviors updated through reinforcement learning. L-CAA can monitor the maintainable conditions of the executing behavior and stop immediately the behavior when some of the conditions fail due to dynamic change of the environment. Additionally, L-CAA can suspend and then resume the current behavior whenever it encounters a higher utility behavior. In order to analyze effectiveness of the L-CAA architecture, we implement an L-CAA-enabled agent autonomously playing in an Unreal Tournament game that is a well-known dynamic virtual environment, and then conduct several experiments using it.

• Journal of Korean Classical Literature and Education
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• no.15
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• pp.389-419
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• 2008

I already wrote a thesis about A Study of Ideologies and Stylistic Features of the Oral Narratives in a Collection of Lee, Duck Moo's Works(ChungJangKwanJunseo)" in The Classical Literature and Education Vol.11, (2006). At that time I held over a study of figure's episodes. So this essay is a series of the thesis. In this essay, I described his critical ideas about the figure's episodes of other people. I classified as the gentry's episodes and the common's episodes, and ones more classified these as the Confucian's moral episodes and the oddity's strange episodes. And I studied the narrative principles and features of narrative structure. He asked for a reasonal thinking attitude in the figure's episodes of other people. In his the gentry's episodes he indicated as a important value the constant attitude of propriety and dignity. The other hand, in his the common's episodes he thought importantly a practical act of the Confucian's moral. He showed man's equality and criticized the anti-practical attitude of the gentry group. In the oddity's strange episodes were focused on the super ability of figures in the both of groups. And then even though there are unreal or unreasonable contents in the oddity's strange episodes, he did not criticize. His such attitude was came out to take interest in unreal story like the Paesasopeum(稗史小品). The the narrative principles of his episodes are two types, one is a summary or a report type, the other is a descriptive of events type. the former was explained by narrater, the latter was described as the indirect or direct narration of the characters. In the structure of narrative in case a summary type were enumerated with the episodes, but in case a report or descriptive type of events were contrasted with characters. A story-telling way of figure's episodes borrowed from 'Jeon(傳)' or 'Yadam(野談)' genre. And a point of view in case a summary or a report type was consisted with a center of narrater, in case a descriptive of events type was consisted with a center of witness.