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Viewpoint-aware Segment Streaming for Free Navigation of Light-field Images
Won-Ki Seo,Chae Eun Rhee 대한전자공학회 2020 IEIE Transactions on Smart Processing & Computing Vol.9 No.2
Virtual reality (VR) is drawing a lot of attention as a future killer application that may surpass the era of two-dimensional video. However, VR still has many technical bottlenecks and challenges that should be overcome for wide application. Image quality and interaction should be improved to increase the immersion level for users. This drastically increases the amount of image data needed for rendering. At the same time, the image should be transmitted without intermittence in a network environment having limited bandwidth. This paper proposes a streaming scheme supporting free navigation in a light field–based VR system. The proposed viewpoint-aware streaming of light-field data focuses on the fact that image data can be reused in active exploration of spaces, in contrast to passive video watching. The quantity of data transmission may be significantly decreased by employing a cache in user devices.
김광환,서순원,이현실,조영채,박미경,정현경 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.2
This research aims to attract patients of AMA(Against Medical Advice). The patients are neglected because they are a few, but the patients are very important for hospital income. So, this study analysis patients of AMA. The analysis items are 1) a course of hospital, 2) health delivery system, 3) whether or not consultant, operation and transfer, 4) principle diagnosis, 5) specialty fields, 6) length of stay, so on. The results show that AMA of male, old, and emergency case is high. In principle diagnosis, AMA of cerebral infaction and fracture and liver disease is high. Therefore it's meaningful research for hospital management.
Lee, Myung-Chul,Rhee, Chae-Seo,Joe, Sam,Yoon, In-Young,Kim, Jeong-Whun Annals Pub. Co 2016 Annals of Otology, Rhinology & Laryngology Vol. No.
<P>Objectives: This study aimed to investigate the dynamic upper airway changes occurring in an obstructive sleep apnea (OSA) rabbit model using dynamic computerized tomography (CT). Methods: In this study, 2.5 U of botulinum toxin type A was injected into the genioglossus to paralyze the tongue in the OSA group (n = 7). The control group was injected with normal saline (n = 7). Apnea-hypopnea index was measured using ApneaLink at baseline and at 1, 2, 3, 4, 6, and 8 weeks post-injection. Anterior to posterior (AP) and transverse diameters at the levels of the palate and tongue base were measured using a dynamic CT at baseline and at 1 and 2 weeks post-injection. Results: The success rate of OSA induction was higher in the OSA group (P = .02). In the OSA group, transverse and AP diameters at the palate level and AP diameter at the tongue base level significantly decreased 2 weeks post-injection (P = .01). Conclusions: A single obstruction site may constitute the primary pathogenesis in some OSA patients, even when the involvement of multiple sites is indicated. These findings may contribute to the identification of OSA pathogenesis and improve the planning of treatment based on the primary cause of OSA.</P>