• Journal of the Korea Computer Graphics Society
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• v.27 no.3
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• pp.43-53
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• 2021

This paper presents an interactive wind system that generates artificial winds in a virtual reality (VR) environment according to online user inputs from a steering wheel and an acceleration pedal. Our system is composed of a head-mounted display (HMD) and three electric fans to make the user sense touch from the winds blowing from three different directions in a racing car VR application. To evaluate the effectiveness of the winds for reducing VR cybersickness, we employ the simulator sickness questionnaire (SSQ), which is one of the most common measures for cybersickness. We conducted experiments on 13 subjects for the racing car contents first with the winds and then without them or vice versa. Our results showed that the VR contents with the artificial winds clearly reduce cybersickness while providing a positive user experience.

• 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.

• Journal of the Korea Computer Graphics Society
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• v.18 no.4
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• pp.25-34
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• 2012

This paper presents a real-time GPU (graphics processing unit) ray casting scheme for rendering isosurfaces of BCC (body-centered cubic) volume datasets. A quartic spline field is built using the 7-direction box-spline filter accompanied with a quasi-interpolation prefilter. To obtain an interactive rendering speed on the graphics hardware, the shader code was optimized to avoid lookup table and conditional branches and to minimize data fetch overhead. Compared to previous implementations, our work outperforms the comparable one by more than 20% and the rendering quality is superior than others.

• Journal of the Korea Computer Graphics Society
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• v.10 no.2
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• pp.10-16
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• 2004

This paper presents an interactive technique that produces static human hairstyles by generating individual hair strands of the desired shape and color, subject to the presence of gravity and collisions. A variety of human hairstyles can be generated by supplying a few parameters to the modeling core, which consists of the wisp generator and hair deformation solver. Wisps are generated employing statistical approaches. As for hair deformation, a method that is not physically-based is proposed to efficiently account for the effects of gravity and collisions. The technique produces various hairstyles much faster than previously proposed methods, and the styles generated by this technique are remarkably realistic.

• Journal of the Korea Computer Graphics Society
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• v.17 no.2
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• pp.17-26
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• 2011

This paper presents an interactive progressive image transmission method, which enables a remote user to interactively select and transmit preferred regions from an index image. Our enhanced quadtree decomposition using PSNR-based rules and new implicit quadtree coding provide better rate-distortion performance than previous quadtree coders as well as leading bit plane methods. An adaptive traversal of child nodes is introduced for better visual display of restored images. Depth-first traversal combined with breadth-first traversal of the quadtree to accomplish interactive transmission as presented, results in a method that provides competitive performance at a low level of computational complexity. Moreover, our decoding requires only simple arithmetic which is enabling our method to be used for real-time mobile applications.

• The Journal of the Korea Contents Association
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• v.10 no.9
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• pp.117-125
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• 2010

Development of digital media and computer graphics related research had changed the overall stream of cultural art and our daily life, as well as its development also had an effect on a fresh and exciting area of cultural arts such as the new media art, interactive art and real-time performing. In this paper, we used emotional expression techniques that they lead audiences on the process of natural communication by combining the particle system of computer graphics with performance based screen art. In this paper, we used emotional expression techniques that they lead audiences on the process of natural communication by combining the particle system of computer graphics with performance based screen art. Namely, by capturing the creation and location speed of particle which is synchronized between the sound, behavior and particles, performance based screen art as the form of the experimental structure in which is combined with scientific technology and art is therefore proposed.

• Proceedings of the Korea Multimedia Society Conference
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• 1998.10a
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• pp.309-314
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• 1998

가상교육(cyber education)은 원격교육에서 시작되어 웹 기반 교육(Web-based Instruction)에 이르기까지 많은 발전을 거듭하여, 최근 국내외에 많은 웹 기반 코스웨어와 가상 클래스 관리 소프트웨어가 개발되고 있다. 가상교육을 위한 코스웨어는 지금까지 텍스트와 이미지 위주의 정적인 구조로 구성되었으나, 최근 웹과 멀티미디어 기술의 발전에 힘이어 이제는 다양한 멀티미디어를 컨텐츠(contents) 개발에 활용하고 동적인 구조와 상호 작용성을 지원할 수 있게 되었다. 본 논문은 이러한 기술발전에 근거하여 웹 기반 코스웨어를 개발하기 위한 컨텐츠 개발모델을 제시하고, 이 개발모델에 기반한 멀티미디어 배움터 개발사례를 설명한다. 멀티미디어 배움터는 10개의 Contents Chapter와 8개의 Lab.으로 구성되어 있으며, 현재 연세대학교 학부 과목인 멀티미디어 강의에서 활용되고 있다.

• Journal of the Korea Computer Graphics Society
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• v.29 no.3
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• pp.127-135
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• 2023

Accurate segmentation of histopathology whole slide images (WSIs) is a crucial task for disease diagnosis and treatment planning. However, conventional automated segmentation algorithms may not always be applicable to WSI segmentation due to their large size and variations in tissue appearance, staining, and imaging conditions. Recent advances in interactive segmentation, which combines human expertise with algorithms, have shown promise to improve efficiency and accuracy in WSI segmentation but also presented us with challenging issues. In this paper, we propose a novel interactive segmentation method, ZoomISEG, that leverages multi-resolution WSIs. We demonstrate the efficacy and performance of the proposed method via comparison with conventional single-scale methods and an ablation study. The results confirm that the proposed method can reduce human interaction while achieving accuracy comparable to that of the brute-force approach using the highest-resolution data.

• Journal of Korea Game Society
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• v.11 no.2
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• pp.29-37
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• 2011

As a field in Digital Arts, interactive video introduced the mirror metaphor to the foundation of media, given its characteristic as a medium that extracts an audience image in a particular perspective. The interactive video work introduced in this paper addresses conceptual topics in the extension of Zhuangzi's Butterfly Dream and illustrates the technological approaches that employ an intensity-based computer vision processing in order to obtain the silhouette of audience for multiple graphical butterflies to draw an audience image. Users generate narratives in the interaction with the projected image. Sound is used in order for the system to provide augmented perception in the space and to add more rooms for narratives. The computer vision and the graphics methods introduced in this paper are suggested as tools for interactive video.

• 한국기계연구소 소보
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• s.16
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• pp.53-61
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• 1986

This paper introduces the program to develop graphics-oriented, interactive, computer-aided design modules for machine elements which are developing in both of CAD/CAM Lab., Numerical Control Department of KIMM in Korea and Mechanical Engineering Department of the Ohio State University in U.S.A. The CAD modules are developed to be efficiently performed within the arena of minicomputer-and personal computer-based computer-aided design. In addition, this paper deals with the state-of-the-art in computer-aided design.