• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.3
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• pp.563-569
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• 2007

As the mobile communication and the semiconductor technology is improved continuously, mobile contents such as the multimedia service and the 2D/3D graphics which require high level graphics are serviced recently. Mobile chips should consume small die area and low power. In this paper, we design a truncated floating-point multiplier that is useful for the 2D/3D vector graphics in mobile devices. The truncated multiplier is based on the radix-4 Booth's encoding algorithm and a truncation algorithm is used to achieve small area and low power. The average percent error of the multiplier is as small as 0.00003% and neglectable for mobile applications. The synthesis result using 0.35um CMOS cell library shows that the number of gates for the truncated multiplier is only 33.8 percent of the conventional radix-4 Booth's multiplier.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.741-742
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• 2022

코로나의 영향으로 더욱더 앞당겨진 메타버스에 대한 관심이 뜨거운 상황이다. 특히 사람들이 모이기 어려운 비대면 상황에서 MICE산업은 많은 어려움을 가지고 있다. 이에 MICE산업의 사업분야의 하나인 전시부스를 메타버스 기법을 활용하여 3D 전시부스를 개발하였다. 전시회를 가상의 공산에서 개최하고 참가업체의 기본정보를 바탕으로 부스를 구성하였다. 특히 비대면 상담이 가능한 External Service를 제공하여 비대면 접점을 높였다. 본 연구를 통해 코로나로 인해 직접 만나지 못하는 상황에서도 실제와 같은 부스를 제공하여 효과적인 MICE의 사례로 활용할 수 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.01a
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• pp.489-492
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• 2023

코로나의 영향으로 더욱더 앞당겨진 메타버스에 대한 관심이 뜨거운 상황이다. 특히 사람들이 모이기 어려운 비대면 상황에서 MICE산업은 많은 어려움을 가지고 있다. 이에 MICE산업의 사업분야의 하나인 전시부스를 메타버스 기법을 활용하여 3D 전시부스를 개발하였다. 전시회를 가상의 공산에서 개최하고 참가업체의 기본정보를 바탕으로 부스를 구성하였다. 특히 비대면 상담이 가능한 External Service를 제공하여 비대면 접점을 높였다. 본 연구를 통해 코로나로 인해 직접 만나지 못하는 상황에서도 실제와 같은 부스를 제공하여 효과적인 MICE의 사례로 활용할 수 있다.

• Journal of the Korea Society of Computer and Information
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• v.13 no.7
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• pp.221-229
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• 2008

The development of computer and multimedia brought out new technology, that is, virtual reality. Computer simulation adaptation among the technologies of the virtual reality is spreaded into air service, motor vehicle, medical science, sports, education, even fashion industry. This study look into 2-dimensional hair-style computer simulation system which is started to common use nowadays and the 3-dimensional system which is under the development. And this study proposed several problems such as heavy 3D system booth and the low price but low qualified camera in order to commercialize the 3D system. This study also suggest several alternative, for instance, the change from object photography method to panoramic photography method, the substitute by middle or high end and high qualified camera.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.5
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• pp.636-642
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• 1999

The synthesis of the 3D images is the most important part of the virtual reality. The ray tracing is the best method for reality in the 3D graphics. But the ray tracing requires long computation time for the synthesis of the 3D images. So, we implement the ray tracing with software and hardware. Specially we design the hit-test unit with FPGA tool for the ray tracing. Hit-test unit is a very important part of ray tracing to improve the speed. In this paper, we proposed a new hit-test algorithm and apply the parallel architecture for hit-test unit to improve the speed. We optimized the arithmetic unit because the critical path of hit-test unit is in the multiplication part. We used the booth algorithm and the baugh-wooley algorithm to reduce the partial product and adapted the CSA and CLA to improve the efficiency of the partial product addition. Our new Ray tracing processor can produce the image about 512ms/F and can be adapted to real-time application with only 10 parallel processors.

• Korean Institute of Interior Design Journal
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• v.26 no.5
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• pp.3-15
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• 2017

The study on bathroom plan for the elderly who use wheelchair has been done continuously. However, the elderly's behaviour at the bathroom and consideration for the caregiver has been underestimated. In this perspective, the purpose of this study is to find out how much more bathroom size is needed for the elderly who use wheelchair and the caregiver based on their behaviours. The study method is as follows: First, behaviours which occur at bathroom were collected from the previous research. Second, the size needed was calculated based on the elderly and caregiver's movement. Third, the size of bathroom enough for the impaired elderly with caregivers was suggested. The room next to shower booth and bath tub should be expanded for the caregiver. In addition, the room beside the basin should be added as much as $600{\times}600$ to let the caregiver stand and support the elderly when they are needed to wash their hair. As a result, the size of bathroom should be at least planed as follow; $1.3m^2$ more for type A, $1.5m^2$ more for type B, $1.6m^2$ more for type C, and $1.1m^2$ more for type D. As the bathroom is the room that the elderly want to modify for their rest of the lives, the room should be reserved enough from the early stage of design, so that this will make the elderly be possible stay at the place until they want to stay.

• Journal of Ginseng Research
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• v.33 no.2
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• pp.104-110
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• 2009

It is well known that the saponin of Korean red ginseng (KRG) has an anti-oxidant effect and could suppress the accumulation of lipid peroxidation. The aim of the present study was to observe the inhibitory effect of KRG on mice with noise-induced hearing loss, and to determine its optimal dose. BALB/c mice with a normal hearing level and normal Preyer's reflexes were used in the study. The mice in the permanent-threshold-shift (PTS) group were exposed to noise (120-dB SPL, white noise band) in a noise booth for 3 h a day, for three consecutive days. The mice in the experimental group were given heat-processed red-ginseng extract (50 mg/kg, 100 mg/kg, and 200 mg/kg), and those in the control group were given normal saline alone during their noise exposure. The mice in the temporary-threshold-shift (TTS) group were exposed to noise (120 dBSPL, white noise band) in a noise booth for 3 h. The mice in the experimental group were given heat-processed red-ginseng extract (50 mg/kg, 100 mg/kg, and 200 mg/kg), and those in the control group were given normal saline alone before their noise exposure. The hearing levels of the mice were measured through auditory brainstem response (ABR) immediately and I, 3, 5, 7, and 14 days after their noise exposure. Cochleae were removed from the mice 14 days after their noise exposure. lmmunochemical and immunofluorescent staining were performed to observe the expression of 8-oxoG in cochlea. In the PTS group, the hearing function of the mice in all the groups was not recovered after their noise exposure. In the TTS group, however, the hearing function of the mice in all the groups was recovered within 14 days. Reduced hearing impairment and early recovery were observed in the mice that were given 200 mg/kg KRG, and early recovery was observed in the mice that were given 100 mg/kg KRG The immunopositive staining of 8-oxoG was detected in the stria vascularis in the control group but was diminished in the mice that were given 200 mg/kg KRG The ingestion of more than 100 mg/kg KRG demonstrated a protection and recovery effect on the noiseinduced-TTS group. Since KRG has been reported to be a safe compound even up to hundreds of mg/kg, a higher concentration of it may effectively protect and recover TTS.