• Journal of the Korea Computer Graphics Society
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• v.22 no.3
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• pp.75-87
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• 2016

Virtual reality exposure therapy (VRET) has been used for a several decades. However, we are not aware any studies that used a smart-phone based virtual reality techniques. In this study, we suggested a new smart-phone based VRET that included photorealistic techniques. We also evaluated the current system with 32 healthy participants, and results suggested that the current system evoked different emotional valences in indoor/outdoor and familiar/unfamiliar environments. The meaning of current results and potential applications of VRET were discussed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.173-176
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• 2001

In this study, we designed a virtual gallery using VRML authoring tool. With this system, we expect to provide a realistic and interactive environment where students can appreciate artistic work in their learning processes. Our system is implemented with several methods such as panorama images and 3D object modules with Photo Vista, Object Modeler and Reality Studio. We currently investigate how this virtual gallery can affect students aesthetic aspects with the intended realistic appreciation In their art education processes. In the following section, we describes how we implemented our virtual gallery with vrml authoring tools.

• Journal of Korea Multimedia Society
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• v.15 no.11
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• pp.1399-1408
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• 2012

The light source is an important visual component that empirically affects the color and illumination of graphic objects, and it is necessary to precisely store and appropriately employ the information of all light sources in the real world in order to obtain photo-realistic composition results. The information of real light sources can be accurately stored in HDR environment maps; however, it is impossible to create new environment maps corresponding to dynamic virtual light sources from a single HDR environment map captured under a fixed lighting situation. In this paper, we present a technique to dynamically generate well-matched information for arbitrarily selected virtual light sources using HDR environment maps created under predefined lighting position and orientation. Using the information obtained from light intensity and distribution analysis, our technique automatically generates HDR environment maps for virtual light sources via image interpolation. By applying the interpolated environment maps to an image-based lighting technique, we show that virtual light can create photo-realistically rendered images for graphic models.

• Journal of Korea Game Society
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• v.7 no.3
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• pp.59-66
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• 2007

Ray tracing is one of the classical global illumination methods to generate a photo-realistic rendering image with various lighting effects such as reflection and refraction. However, there are some restrictions on real-time applications because of its computation load. In order to overcome these limitations, many researches of the ray tracing based on GPU (Graphics Processing Unit) have been presented up to now. In this paper, we implement the ray tracing algorithm by J. Purcell and combine it with two methods in order to improve the rendering performance for interactive applications. First, intersection points of the primary ray are determined efficiently using rasterization on graphics hardware. We then construct the acceleration structure of 3D objects to improve the rendering performance. There are few researches on a detail analysis of improved performance by these considerations in ray tracing rendering. We compare the rendering system with environment mapping based on GPU and implement the wireless remote rendering system. This system is useful for interactive applications such as the realtime composition, augmented reality and virtual reality.