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가변형 패럴랙스배리어를 이용한 무안경 디스플레이 시스템
위성민,이승현,Wi, Sung-Min,Lee, Seung-Hyun 한국광학회 2008 한국광학회지 Vol.19 No.2
An advantage of parallax barrier displays is that they can also display 2D and 3D contents and can be automatically switched between the two types. But, as the viewer changes position, different views of the scene will be directed by the barrier to the visual system. Moving horizontally beyond a certain point will produce "image flipping" of the different views of the scene. These limitations make unavoidable the use of another autostereoscopic display solutions like eye tracking or increasing the number of views. In this paper, a method of the moving parallax barrier design is introduced to supplement a disadvantage of the fixed parallax barrier that provides observation at specific locations. For making the moving parallax barrier, the cross connector with 640 lines FPC is designed. A commercially available web camera is utilized to implement eye-tracking system and shows the experimental result. 패럴랙스배리어의 장점은 2D와 3D 콘텐츠를 자동적으로 스위칭 하여 디스플레이 할 수 있다는 것이다. 그러나 관찰자가 움직일 경우 배리어를 통과하는 영상이 바뀌게 되며, 수평으로 어느 범위 이상을 움직이게 되면 영상이 역전되어 다른 영상을 보게 된다. 이러한 제한점을 해결하고자 시점추적이나 시점을 증가시키는 것과 같은 무안경 스테레오 디스플레이가 소개되고 있다. 본 논문에서는 일정한 위치에서만 관찰할 수 있는 고정식 패럴랙스배리어의 단점을 보완할 수 있는 가변형 패럴랙스배리어 방식을 제안하였으며, 가변형 배리어의 제작을 위하여 640 라인 FPC로 구성된 새로운 교차커넥터를 설계하였다. 또한, 일반적으로 사용되는 웹 카메라를 이용하여 시점추적시스템을 구현하였고 실험 결과를 보였다.
View Point Tracking for Parallax Barrier Display Using a Low Cost 3D Imager
위성민,김동욱,Wi, Sung-Min,Kim, Dong-Wook Korea Computer Institute Society 2008 컴퓨터産業敎育學會論文誌 Vol.9 No.3
We present an eye tracking system using a low cost 3D CMOS imager for 3D displays that ensures a correct auto stereoscopic view of position- dependent stereoscopic 3D images. The tracker is capable of segmenting the foreground objects (viewer) from background objects using their relative distance from the camera. The tracker is a novel 3D CMOS Image Sensor based on Time of Flight (TOF) principle using innovating photon gating techniques. The basic feature incorporates real time depth imaging by capturing the shape of a light-pulse front as it is reflected from a three dimensional object. The basic architecture and main building blocks of a real time depth CMOS pixel are described. For this application, we use a stereoscopic type of display using parallax barrier elements that is described as well.
위성민,안응남 성균관대학교 2000 스포츠과학논집 Vol.5 No.-
The purpose of this study was to analyze the effect of a exercise type on bone mineral density(BMD) and isokinetic strength of Lumber spine and proximal Femur. Also, revealed the Pearson correlation between BMD and isokinetic strength and calculated regression were employed and results are as follows; 1. There were significantly correlation between BMD and femur and peak torque of left, right extension musle(p<0.05), and peak torque of right extension muscle showed 39.9% predictor of BMD in femur for middle-aged women. 2. There were significantly correlation between BMD of lumber and peak torque of left extension muscle(p<0.05) , and peak torque of right extension muscle showed 34.1% predictor of BMD in lumber for middle-aged women. 3. There were significantly correlation between BMD of femur and peak torque of left extension muscle in mountain climbing group(p<0.05) and peak torque of left extension femur showed 51.6% predictor of BMD in femur. 4. There were significantly correlation between BMD of lumber and peak torque of left extension and right flexion musle(p<0.03, and peak torque of right flexion musle showed 45.3% predictor of BMD in lumber. BMD and musle strength is decreased with aging but regular exercise activity will prevent and promote the BMD and muscle strength. Specially, weight-bearing exercise, such as mountain climbing and jogging, are more effective for maintain a BMD and muscle strength of body. In conclusion, mountain climbing was more effective than swimming in respect of BMD and muscle strength. therefore, it is recommended that mountain climbing was a more protective role for BMD of lumber. femur and maintain a isokinetic strength of lower body.
위성민 ( Sung Min Wi ),이진석 ( Jin Seok Lee ),장보윤 ( Bo Yun Jang ),김준수 ( Joon Soo Kim ),안영수 ( Young Soo Ahn ),윤우영 ( Woo Young Yoon ) 한국주조공학회 2013 한국주조공학회지 Vol.33 No.4
A ribbon-type polycrystalline silicon wafer was directly fabricated from liquid silicon via a novel technique for both a fast growth rate and lagre grain size by exploiting gas pressure. Effects of processing parameters such as moving speed of a dummy bar and the length of the solidification zone on continuous casting of the silicon wafer were investigated. Silicon melt extruded from the growth region in the case of a solidification zone with a length of lcm due to incomplete solidification. In case of a solidification zone wieh a length fo 2 cm, on the other hand, continuous casting of the wafer was impossible due to the volume expansion of sil-icon derived from the liquid-solid transformation in solidificatioon zone. Consequently, the optimal length of the solidification zone was 1.5 cm for maintaining the position of the dummy bar was 6 cm/min, but liquid silicon extruded from the growth region without solidification when the moving speed of the dummy barr was≥9 cm/min. This was due to a shift of the position of the solid-liquid interface from the solidification zone to the moving area. The present study repots experimental findings on a new direct growth sys-tem for obtaining silicon wafers with both high quality and producticity, as a candidate for an altemate route for the fabrication of ribbon-type silicon wafers.