• Korean Journal of Optics and Photonics
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• v.23 no.6
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• pp.255-263
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• 2012

In this paper, we designed a tabletop display which enables two viewers each to see a different image simultaneously within his/her defined viewing zone. In order to construct the designed viewing zones, we found the basic design conditions for a parallax barrier with a commercial LCD panel. As the viewing zones for two viewers are formed with only two view-point design, the interval between the center positions of each viewing zone and the width of each viewing zone are small compared to designed values. We analyzed the primary cases, introduced two modified design methods to enlarge the interval and the width of the viewing zones, and simulated their characteristics. As designed with six unit view-point and each viewing zone of each viewer is formed with a merged view-point, we found that adequate interval and width of viewing zones can be made, and we verified it in comparison with the tabletop display module that we fabricated.

• Korean Journal of Optics and Photonics
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• v.19 no.2
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• pp.116-121
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• 2008

A two dimensional point light source array can replace both the viewing zone forming optics and the back light panel in the contact-type 3 dimensional imaging systems based on LC panels. This replacement can make the system structure of the 3 dimensional imaging systems no different from that of the conventional LCD and can reduce undesirable visual effects caused by the viewing zone forming optics. The problem with the point light source array is the visual quality deterioration of the system due to the non-ideal nature of the array.

• The Korean Publising Journal, Monthly
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• s.319
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• pp.40-41
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• 2002

• Journal of Broadcast Engineering
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• v.17 no.5
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• pp.817-826
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• 2012

This paper presents a robust viewpoint estimation algorithm for Moving Parallax Barrier mobile 3D display in sudden illumination changes. We analyze the previous viewpoint estimation algorithm that consists of the Viola-Jones face detector and the feature tracking by the Optical-Flow. The sudden changes in illumination decreases the performance of the Optical-flow feature tracker. In order to solve the problem, we define a novel performance measure for the Optical-Flow tracker. The overall performance can be increased by the selective adoption of the Viola-Jones detector and the Optical-flow tracker depending on the performance measure. Various experimental results show the effectiveness of the proposed method.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.15-18
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• 2011

본 논문에서는 이동형 패럴랙스 배리어 방식의 모바일 3D 디스플레이에 응용하기 위해 개발된 시역계측알고리즘[1]을 실제시스템에 구현한 후 문제점을 분석하고, 그 문제점을 해결할 수 있는 새로운 방법을 제안한다. 본 연구팀에서 이동형 패럴랙스 배리어 방식의 모바일 3D 디스플레이에 응용하기 위해 개발한 이전의 시역계측기술[1]은 기존의 비올라-존스 얼굴 검출기[2]에 의한 얼굴검출 결과와 비올라-존스 얼굴 검출기의 단점을 보완하기 위해 새롭게 추가된 옵티컬-플로우 특징점 추적 알고리즘[3]에 의한 얼굴검출의 두 결과를 선형적으로 결합하여 시청자의 시역위치를 예측하였다. 하지만, 모바일 3D 디스플레이의 특성한 급격한 조명의 변화에서 옵티컬-플로우에 의한 특징점 추적알고리즘에 심각한 오류가 발생하는 문제점이 있다. 이러한 급격한 조명의 변화에 대한 문제점을 해결하기 위해 본 논문에서는 매 프레임마다 정확하게 옵티컬-플로우 얼굴 검출기의 정확도를 판단할 수 있는 방법을 제안하고, 다양한 실험을 통해 그 효과를 검증한다.

• Proceedings of the Optical Society of Korea Conference
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• 2008.02a
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• pp.261-263
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• 2008

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.8A
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• pp.698-705
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• 2012

In this paper, we proposed an autostereoscopic display simulator that calculates an extended intensity distribution of light emitted from respective light sources and reaching respective views in an observing area to an observing plane. It simulates intensity distribution in horizontal and vertical observing ranges from the predetermined observing plane and obtains an optimal viewing area image having quantities of light according to respective views based on the intensity distribution data. As a result of the simulation the proposed system enables guiding viewing comfort zone interactively.

• Journal of the Speleological Society of Korea
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• v.40 no.41
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• pp.58-69
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• 1995

천곡동굴이 위치하고 있는 동해시의 천곡동은 동해시역 중에서도 중심부에 해당되는 지역이다. 이 지역은 북쪽의 묵호지역과 남쪽의 북평지역을 연결시켜주는 지역이며 교통도 매우 편리하고 앞으로도 크게 발전할 수 있는 곳이다. 또한 이 지역은 수산항이라고 할 수 있는 묵호항과 산업항인 동해항( 및 북평항)과의 중간지점에 위치하여 두 지역의 결합적 역할수행이 요구되고 있는 지역이기도 하다. 또한 동북아시아의 관광루우트 설정시에도 동해시가 동해안의 중심적인 현관구실을 하여야 할 곳으로 대두되고 있어 앞으로 인구흡인의 원동력이 될 수 있는 관광개발이 요구되고 있는 현실이다.

• Korean Journal of Microbiology
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• v.20 no.2
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• pp.98-104
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• 1982

Detergent-degrading bacteria isolated from the Han River downstream running through the center of Seoul area were identified. Samples were monthly taken from the surface waters at four designated sites from October, 1980 to August, 1981. Isolated strains were characteristically Gram-negative bacteria in all, and they were classified within 18 genera, 43 spceies. The dominant strains of detergent -degrading bacteria were within geneus Pseudomonas. On the regional distribution of detergent-degrading bacteria, Euterobacteriaceae and genus Aeromonas were suddenly increased at the Third Bridge of site 2 and the First Bridge of site 3, and others were almost the same regardless of sites.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.10
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• pp.903-910
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• 2013

An autostereoscopic multi-view 3D display system has the narrower degrees of freedom in the observational directions, such as the horizontal and perpendicular directions to the display plane, than the glasses-on type of 3D display. In this paper, we propose an innovative method to expand the width of the viewing zone formed in the depth direction while maintaining the number of views in the horizontal direction by using a triple segmented-slanted parallax barrier (TS-SPB) in the glasses-off type of 3D display. The validity of the proposal was verified by an optical simulation based on an environment similar to an actual case. The maximum number of views that can be displayed in the horizontal direction is 2n, and the width of the viewing zone with depth increased up to a factor of 3.36 compared to the existing one-layered parallax barrier system.