• Journal of Korean Ophthalmic Optics Society
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• v.19 no.1
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• pp.87-92
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• 2014

Purpose: Comparison with contrast sensitivity between binocular and monocular of 20s adult was measured by spatial frequency 3.0, 6.0, 12.0 and 18.0 cpd and compares difference between monocular and binocular and difference between male and female. Methods: Topcon CV-3000 Phoroptor was used for full correction of 99 ophthalmic optics students and contrast sensitivity were measured by using Vector Vision CSV-1000E at 2.5 m in photopic condition (100 $cd/m^2$). Results: Photopic condition at 2.5 m, average contrast sensitivity of entire subject was 52.54, 80.40, 36.79 and 13.56 with right eye and 52.33, 81.29, 41.73 and 14.22 with left eye in 3, 6, 12 and 18 cpd. For both eye 65.46, 113.69, 52.04 and 19.44 were measured. The contrast sensitivity of male was 58.22, 83.52, 37.89 and 13.82 with right eye and 56.03, 46.68 and 15.67 with left eye in spatial frequency of 3, 6, 12 and 18 cpd. Both eyes were measured to 70.89, 120.96, 56.56 and 19.89. The contrast sensitivity of female was 46.50, 77.09, 35.61 and 13.28 with left eye and 48.40, 70.43, 36.47 and 12.68 with left eye in spatial frequency of 3, 6, 12, 18 cpd. Both eyes were 59.68, 105.97, 47.23 and 18.95. Conclusions: Contrast sensitivity value of binocular shows higher than monocular to both male and female. Contrast sensitivity of difference between male and female were statistically remarkably higher to male in right eye 3 cpd, left eye 6 cpd, 12 cpd and both eye 3 cpd. In other frequency, there was no statistical significance but male shows higher.

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.1
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• pp.99-104
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• 2014

Purpose: This study was to investigate the functional improvement in peripheral vision following eccentric viewing training. Methods: 14 subjects with normal vision took a part with their right eye, peripheral retinal which is $20^{\circ}$ lateral area from the fovea was examined for contrast sensitivity(CS). Eccentric viewing training was performed for 21days with an hour image viewing and examination was repeated. Results: The critical durations for 0.7 cpd were increased 2.67(467 ms) for pre-eccentric viewing training to 2.79(616 ms) for post-eccentric viewing training (p>0.05). The critical durations for 3.0 cpd were also increased 2.53(341 ms) for pre-eccentric viewing training to 3.04(1102 ms) for post-eccentric viewing training (p>0.05). Conclusions: It is recommended to use higher spatial frequency with higher CS for eccentric viewing training and to train more frequently for a short time. Moreover, the study on Korean standardizing of the visual rehabilitation for low vision based on the etiology is sorely required.

• The Journal of the Acoustical Society of Korea
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• v.17 no.4
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• pp.30-37
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• 1998

본 논문은 중공형 층상 복합체 멘드릴(mandrel)을 이용하여 기본 공진주파수가 15kHz이상이고, 우수한 감도 특성을 지닌 광섬유 하이드로폰의 최적 구조를 설계하는 것에 관한 것이다. 유한요소법을 이용하여 Al/foraming 및 Nylon/foaming층상 복합체의 공지주 파수를 분석하여 설계 변수의 범위를 결정하였고, 멘드릴 형상에 따른 광음향 감도 특성을 분석하여 최적구조를 결정하였다. 그 결과로 멘드릴의 외경이 감소할수록, 길이가 증가할수 록 감도가 향상되었다. AL 멘드릴의 경우, 내경/외경 비가 낮을수록, Nylon멘드릴의 경우 내경/외경 비가 높을수록 감도 증가를 위하여 효율적이다. 그리고 결정된 최적구조의 Al/foaming 및 Nylon/foaming멘드릴을 사용한 광섬유 하이드로폰의 감도는 각각 1rad./Pa 대비 약 82dB 및 85.7dB 정도 이었고, Al층상 복합체 보다는 Nylon층상 복합체를 이용하는 것이 고 감도의 광섬유 하이드로폰을 제조하는데 유리함을 알 수 있었다.

• Korean Journal of Optics and Photonics
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• v.15 no.5
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• pp.461-468
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• 2004

A finite model eye of visual acuity 24/20 in emmertropia was presented. We determined the image intensity profile on retina using optical transfer function of model eye, and compared with clinical data. The retinal contrast sensitivity function based on the Stiles-Crawford effect, photopic response, diffraction, aberration, retinal contrast sensitivity, and pupil size is calculated. Visual acuity for human eye could be predicted by examining the modulation transfer function of a bar target and retinal contrast sensitivity function. This visual acuity was evaluated for pupil diameters ranging from 1 to 8 mm.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.4
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• pp.37-42
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• 2018

With advancements in digital image production technology, the branch of stereoscopic image technology has also been undergoing active development. Accordingly, research and development on cutting-edge display products for mounting stereoscopic images are currently being pursued. There are various problems that can occur when viewing 3D images. Because viewers feel visual fatigue while perceiving the depth of the images provided via an artificial method, a negative human factor such as visual fatigue has become one of the most prominent concerns, especially as it is a factor that affects the ongoing maintenance of 3D images. Therefore, by identifying the factors affecting the depth of the graphic images provided in 2D images, and subsequently using this information to develop an image processing method, we conducted depth-related experiments and analysed them under the assumption that stereoscopic images could be reproduced without visual fatigue. Thus, we analysed the most significant factors related to depth and verified the interactions by performing depth-related factors-based ANOVA variance analysis by differentially applying the texture, colour temperature, and contrast ratio to graphic images. We determined the significance of the factors related to depth and proposed a method to improve depth based on an analysis of the results of the experiments conducted in this study.

• 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.

• 한국벤처창업학회:학술대회논문집
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• 2019.11a
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• pp.107-112
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• 2019

21세기 4차 산업혁명 시대에 급변하는 산업과 기술 발전으로 인해 기존의 직업과 일자리의 위협과 변화가 커짐에 따라 청소년의 진로에 대한 준비는 더욱 절실해졌다. 청소년들은 급격한 기술 발전과 시장의 변화로 인한 기존 직업 소멸, 일생에서의 직업 활동기간의 비약적인 증가가 맞물려서 평생 한 번은 창직이나 창업을 해야만 하는 시대를 살고 있다. 이에 대비하기 위해 진로 및 직업활동에 대한 기회를 발견하고, 급변하는 시대와 시장의 다양한 문제들을 창의적으로 해결하고, 남들과 다르게 자신만의 방법으로 다방면의 경험과 지식을 쌓기 위한 자기주도적 학습력이 필수가 되었다. 본 연구는 그동안 다루어지지 않았던 청소년의 기회발견, 창의성 역량, 자기주도 학습력이 진로결정 자기효능감에 미치는 영향에 대해 청소년 진로교육 사례를 중심의 연구이다. 청소년에게 기회발견, 창의성 역량, 자기주도 학습력이 기업가정신의 매개로 하여 진로결정 자기효능감에 어떠한 영향을 미치는지에 대한 것이 주요 연구목적이다. 분석결과, 첫째로 기회발견, 창의성 역량, 자기주도 학습력은 진로결정 자기효능감에 유의한 영향을 미치는 것으로 나타났다. 둘째, 기업가정신의 향상 정도에 따라 진로결정 자기효능감에 매개 역할을 부분적으로 하고 있음이 확인되었다. 이와 같은 결과는 앞으로 청소년의 진로 및 기업가정신 교육에 중요한 자료가 될 것이며, 향후 청소년 진로 및 기업가정신 교육 프로그램의 연구개발을 위해 관련 연구가 확대 되어야 할 것이다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.44 no.4
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• pp.491-496
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• 2015

The purpose of this study was to assess the antioxidant, anti-inflammatory, and immuno-enhancing effects of Daebong persimmon (DP) and Bansi (BS) in vivo. Two types of astringent persimmons (DP and BS) were used for this experiment. C57BL/6J mice were assigned to the following groups: 1) lean control, 2) high-fat diet control (HF), 3) A region DP (3% wt/wt) with HF diet (A-DP), 4) B region DP with HF diet (B-DP), 5) C region DP with HF diet (C-DP), 6) D region BS with HF diet (D-BS), and 7) E region BS with HF diet (E-BS). All mice were sacrificed after 4 weeks of treatment, after which blood and tissues were collected. Antioxidant enzyme activities, inflammatory markers, and immune factors were evaluated. DP and BS treatments did not alter food intake or body weight, compared with HF. Administration of B-DP increased catalase activities in serum. Hepatic levels of malondialdehyde, a product of lipid peroxidation, were significantly lower in A-DP mice than in the HF group. A-DP had down-regulatory effects against inflammation induced by high-fat diet feeding, as shown by significant reduction of interleukin (IL)-$1{\beta}$, IL-6, and tumor necrosis factor-${\alpha}$. Additionally, A-DP treatment exerted an immuno-stimulatory effect, as shown by increasing levels of immunoglobulin G. DP treatment improved the level of insulin-like growth factor-1. These results indicate that DP has beneficial health effects on oxidative stress, inflammation, and immunity in vivo.

• The Korean Journal of Vision Science
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• v.20 no.4
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• pp.505-511
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• 2018

Purpose : This study investigated the visual functions of drivers aged over 65 year olds and drivers aged 50~65 year olds. In addition, difference of visual functions between professional drivers and normal drivers were investigated. Methods : Forty Driver aged over 65 year olds and 67 drivers aged less than 67 year olds were participated. All participants had more than 5 years of driving experiences and had no ocular pathology. Demographic data(gender, job, age, body condition) and visual functions such as contrast sensitivity(CS), stereopsis, glare recovery time and discomfort glare index were measured. Results : Constrast sensivity under photopic condition was higher with bus driver group. In addition, difference of CS at 12cpd and 18cpd were signifcantly different between normal drivers(1.57) and bus drivers(1.70) (p<0.05). There was no significant difference for glare recovery time, despite of trend of longer recovery time with age. Discomfort glare index was significantly different that normal drivers with more than 65 year olds had 3, taxi and truck driver presented almost 5 index score (p<0.05). Conclusion : Analysis of visual function of elderly drivers, it was confirmed that their visual functions decreased with age. Therefore, visual function tests such as CS, discomfort glare index and stereopsis in addition to current available test may need to be considered for drivers aged over 65.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2017.11a
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• pp.311-312
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• 2017

본 연구에서는 다중이용시설의 테러대비를 위한 테러리즘 의미를 고찰하여 비교해석 함으로써 국가안보와 공공안전 사이에서 발생하는 이중적 법적 해석으로 발생하는 이격을 줄이기 위해 진행 되었다. 최근 불특정 다수의 공포감을 극대화를 위한 민간 다중이용시설의 테러증가와 북한에 테러위협, 국내에 발생가능 자생테러를 대비하기 위해 테러행위에 대한 명확한 해석에 초점을 맞추어 연구하였다. 국외의 테러관련 법을 고찰하여 테러리즘에 대한 전쟁행위, 범죄행위, 사고행위를 구분하였으며 이를 통해 부처별 고유업무에 혼선을 줄이는 해석 방법을 제공하였고, 테러리즘 정의의 법적 미비점을 도출하여 개선방향을 제언함으로서 사후 국가위기상황 재난관리에 대한 대테러 전략 구축 및 개선 시 필요한 기초자료를 제공하고자 한다.