• Journal of the Institute of Convergence Signal Processing
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• v.6 no.3
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• pp.112-119
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• 2005

In this paper, a model of neural circuit was proposed, which abstracts the depth information in two images gotten from right and left retinas. The proposed neural circuit corresponds to binocular stereo vision based on psychologic and physiological knowledge, and we examine a restoration method of three-dimensional surface. In case of drawing a disparity based on characteristics of images, we can not abstract the depth information correctly if resemblant characteristics are repeated on the boundary region of an object. A binocular disparity is decided in a model of neural circuit by abstraction, synthesis, and correction of a disparity. And we propose a method which restores three-dimensional shape by correcting a depth information, and also restores a three-dimensional surface by mapping a left input image on the restored three-dimensional shape. And we confirmed that the computation time for disparity abstraction can be greatly reduced through the simulation.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.4-5
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• 2011

본 논문에서는 비대칭적 화질을 갖는 스테레오 3DTV 시스템에서 좌우 두 영상의 화질차이가 합성한 스테레오 3D 영상의 주관적 화질을 떨어뜨릴 정도로 현저한 경우, 이 화질 차이를 보상하기 위하여 조건부 대체를 포함한 양안시차 맵을 이용하는 방법을 제안한다. PSNR값 비교를 통하여 화질 개선 정도를 보았고 0.37~18dB 정도의 PSNR 개선을 확인하였다.

• Journal of the Institute of Convergence Signal Processing
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• v.2 no.4
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• pp.59-64
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• 2001

In this paper it was proposed method that solve problems of method to segment region of zero disparity and algorithm that extract binocular disparity to estimate position of object by vergence movement of moving stereo cameras experimented to compare those. There was not change of density value almost in region that change of critcal value was not found almost in image, because a high critical value was set so that critical value may be kipt changelessly about all small regions in studied treatise so far. The corresponding points were extracted wrongly by the result. By because the characteristics of small region was evaluated by autocorrelation and the critical value was established that may be proportional to the autocorrelation value, it was confirmed that corresponding points are not extracted almost by mistake and binocular disparity could by extracted with high speed.

• Journal of Korean Ophthalmic Optics Society
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• v.5 no.2
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• pp.49-53
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• 2000

Comparing to an Image test chart which printed from computer. Hahn's standard test chart and Chart project test chart propose to make the program of an image test chart in computer. Test type of the test chart should be programed by difference size which was examined Hangul program of Hangul & Computer Co. An image test of visual acuity most decreased among 3 kinds of testing. Testing of Fixation disparity was same between Diplopia test and chart project test chart, so that. Design of test chart could be programed diverse by Hangul program of Hangul & Computer Co.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1852-1856
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• 2010

본 연구에서는 청계천 물막이판 설치로 인한 유역의 내수침수 영향을 분석하고자 한다. 따라서 강우시 청계천 유역내 수문열림으로 인한 양안의 복개박스와 하천 본류간의 유출거동 모의가 필요하며, 이를 위해 청계천 수문을 SWMM 모형의 위어 조건으로 고려하여 박스와 연결된 관망의 유출량을 지점별로 모의 할 수 있도록 하였다. 실제 역류가 발생한 2009년 호우사상을 대상으로 물막이판 설치 전 후에 따른 청계천 본류와 양안 박스의 흐름 및 내수 침수의 영향을 분석한 결과 월류 발생 여부 및 지속시간의 경우 설치 전 후 동일하였으나 최대월류량 및 총 월류량은 설치 후 높게 산정된 것으로 나타났다. 이는 관거의 통수능 부족과 물막이판 설치로 인한 박스 내 수위 상승에 의한 것으로 판단된다. 향후 실제월류 발생 사상의 추가적인 모의를 통해 물막이판 설치 영향을 구체적으로 평가하고자 하며, 박스 내 수위 조절이 가능한 물막이판을 설치함으로써 최적 물막이판 운영방안을 도출하고자 한다.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.4
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• pp.278-288
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• 2010

In this paper, we carried out quality assessment and analysis of stereoscopic 3D Television pictures according to ITU-R contribution and recommendation by rating scales using DSCQS (Double-Stimuli Continuous Quality Scale) method. The evaluation results show that overall quality and sharpness of stereoscopic pictures revealed almost no difference compared to cases of mono pictures as to natural outdoor scenes, graphic images, and indoor scenes (about 3.0 above ~ 4.0), but depth perception and sensation of reality of stereoscopic images exhibit better quality performance over mono images as indicated more than 4.0 out of 5.0 grade. Evaluation results should be considered as human factors such as disparity when shooting and/or editing 3DTV.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.446-446
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• 2016

최근 이상기후와 집중호우가 잦아지면서 홍수량이 증가하고 홍수로 인한 국내 인명 및 재산 피해가 점차 커지고 있다. 홍수피해를 줄이고자 하천정비사업을 통해 홍수 발생 시 초기 홍수량을 일부 분담하여 하도 내 수위를 저감시킬 수 있는 하천시설로서 강변저류지를 도입하였다. 강변저류지는 하도 내 존재하고 있는 수문 시설과 함께 운영되고 있으며 두 시설의 운영 최적화를 위해서 공조운영 사항에 대해 고려할 필요가 있다. 국내 화순 홍수조절지와 담양 홍수조절지의 경우 수문 상류부 하전 제방 양안에 2개소의 강변저류지가 설치되어 있다. 선행연구를 통해 강변저류지 유무에 따른 수위저감효과를 확인하였으며 1개소의 강변저류지와 수문 공조운영 시 최적의 수위 저감효과가 발생하는 횡월류부 위치를 검토하였다. 본 연구에서는 강변저류지 유입부인 2개소의 횡월류부 위치 변화에 따른 수위저감효과를 검토하였다. 횡월류부 1개소의 최적 위치를 좌안의 횡월류부 위치로 선정하고 우안의 횡월류부 위치와 수로폭에 대한 무차원 변수를 실험조건으로 하였다. 동일한 수문 운영조건에서 총 3가지 조건의 유량으로 우안 횡월류부 위치 변화에 따른 수위 저감효과를 분석하고 2개소 횡월류부에 대한 최적 위치를 확인하였다.

• Journal for History of Mathematics
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• v.37 no.3
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• pp.59-75
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• 2024

This study aims to analyze Joseon mathematical knowledge and its application to real world. The mathematical knowledge refers to measuring the area of plane figures, known as square-shaped land(方田). Its application is land surveys(量田) conducted for taxation purposes. Specifically, this study analyzes the correlation between the related contents in representative mathematical books of the Joseon Dynasty, such as MuksaJipsanbub (17th century), Guiljib (18th century), and SanhakIbmun (18th century), and the shapes and areas of plane figures presented in GwangmuYangan (20th century). The analysis reveals both differences and similarities in the measured area between mathematical books and real world land surveys. While most results of the land survey align with the results obtained from mathematical methods, differences arise due to variations in real measurement of lengths and given conditions in the problems. Additionally, various aspects such as the focus on rectangles in land surveys, the proportionality and relativity of lengths, types of approximation, composed shapes, the purpose of problem solving, and reasoning of unspecified shapes or measures are discussed.

• Journal of the Korea Computer Graphics Society
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• v.22 no.3
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• pp.11-20
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• 2016

This paper introduces an effective method for generating 3D stereoscopic images that gives immersive 3D experiences to viewers using mobile-based binocular HMDs. Most of previous AR systems with monocular cameras have a common limitation that the same real-world images are provided to the viewer's eyes without parallax. In this paper, based on the assumption that viewers focus on the marker in the scenario of marker based AR, we recovery the binocular disparity about a camera image and a virtual object using the pose information of the marker. The basic idea is to generate the binocular disparity for real-world images and a virtual object, where the images are placed on the 2D plane in 3D defined by the pose information of the marker. For non-marker areas in the images, we apply blur effects to reduce the visual discomfort by decreasing their sharpness. Our user studies show that the proposed method for 3D stereoscopic image provides high depth feeling to viewers compared to the previous binocular AR systems. The results show that our system provides high depth feelings, high sense of reality, and visual comfort, compared to the previous binocular AR systems.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.2
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• pp.149-154
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• 2002

This study is examined the difference between binocular spherical diopter and astigmatism diopter, spherical diopter, astigmatism diopter, and axis of astigmatism by sex and age with reference to the prescription of refraction for a total of 257 persons, 134 persons (male:78, female: 56)of teen-age and 123 persons of twenty-age who visit optical shop. Spherical correction diopter is mainly distributed to 280 eyes between -0.25D and -4.00D. And in astigmatism correction, for right astigmatism, 48 eyes(49.48%) are prescribed astigmatism diopter for a range of C-0.25~C-0.50D, 29 eyes(29.89%) has C-0.75~C-1.00D, 65 eyes(67.01%) has with the rule astigmatism. For left astigmatism, 43 eyes(42.57%) are prescribed astigmatism diopter of C-0.25~C-0.50D and 37 eyes(36.63%) has C-0.75C~1.00D, 73 eyes(72.27%) are shown with the rule astigmatism. And also each 108 persons(47.16%) and 28 persons(25.00%) are shown no difference between binocular spherical correction diopter and binocular astigmatism correction diopter, 94 eyes(39.49%) of teen-age and 104 eyes(42.27%) of twenty-age, male 119 eyes(41.90%) and female 79 eyes(34.34%) need correcting astigmatism. In pupillary distance, 165 persons mostly have 59~64mm.