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정석후 ( Seok Hu Jeong ),오경용 ( Kyong Yong Oh ),신동수 ( Dong Su Shin ),최성한 ( Shung Han Choi ),정을식 ( Eul Sik Jung ),박진선 ( Jin Sun Park ),나선영 ( Sun Young Na ),성지윤 ( Ji Yoon Sung ),정지용 ( Ji Yong Jung ),김세중 ( S 대한신장학회 2010 Kidney Research and Clinical Practice Vol.29 No.4
Kaposi`s sarcoma (KS) is an unusual multifocal neoplasm of vascular endothelial cell origin. The trunk, arms, head, and neck are the most common sites. It is common in men and has four distinct variants: classic, Africa-endemic, immunosuppressive drug-associated, and acquired immunodeficiency syndromeassociated KS. KS appears to develop immunosuppressed patients, but is uncommon in patients on dialysis. A 79-year-old man on hemodialysis for 2 months presented with pruritus over the entire body and multiple, discrete, variable-sized, dark blue papulonodules (papuloplaques, maculopapules) on the left arm and shoulder. A biopsy specimen form the left arm showed spindle cells with slit-like spaces and extravasated red blood cells. The specimen was positive for CD 34 antigen, and human herpesvirus 8 was detected. We report a case of KS that occurred in a 79-year-old patient on hemodialysis.
근전도 신호를 이용한 헤드-트래킹 지연율 감소 방안 연구
정준영 ( Jun-young Jung ),나정석 ( Jung-seok Na ),이채우 ( Chae-woo Lee ),이기현 ( Gihyeon Lee ),김진현 ( Jinhyun Kim ) 한국센서학회 2016 센서학회지 Vol.25 No.5
The study about VR (Virtual Reality) has been done from the 1960s, but technical limits and high cost made VR hard to commercialize. However, in recent, high resolution display, computing power and 3D sensing have developed and hardware has become affordable. Therefore, normal users can get high quality of immersion and interaction. However, HMD devices which offer VR environment have high latency, so it disrupts the VR environment. People are usually sensitive to relative latency over 20ms. In this paper, as adding the Electromyogram (EMG) sensors to typical IMU sensor only system, the latency reduction method is proposed. By changing software and hardware components, some cases the latency was reduced significantly. Hence, this study covers the possibility and the experimental verification about EMG sensors for reducing the latency.