• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.677-680
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• 2010

본 연구는 경기도 구리시의 2개 초등학교 5, 6학년 학생을 대상으로 시력 저하 실태 및 그와 관련된 요인들을 알아보고 시력 저하 예방교육의 기초자료로 활용하고자 시도 된 연구이다. 자료의 수집은 2009년 11월 1일부터 12월 10일까지 초등학교 5학년, 6학년 학생 793명(남 417명, 여 376명)이었고 2009학년도의 시력검사자료 분석과 문헌 및 기존의 조사도구를 토대로 개발한 자가 보고식 설문지를 이용하여 조사하였다. 자료 분석은 SPSS WIN 12.0(한글판)프로그램을 이용하여 빈도, 백분율, $x^2$-test 및 로지스틱 회귀분석의 통계적 방법으로 분석하였다. 시력저하에 유의한 영향요인으로 좌측시력을 종속변수로 한 경우 중 일반특성에 따른 변수인 부모 및 형제와 자매가 안경 및 렌즈 착용하는 경우, 경제적으로 어려울수록 시력 저하 자가 많았고, 환경특성에 따른 변수인 거실 및 방안밝기가 어두울수록, 컴퓨터 사용 시 실내밝기가 어두울수록, TV의 눈높이 및 컴퓨터 모니터의 눈높이가 높을수록 시력 저하 자가 많았다. 우측시력을 종속변수로 한 경우 중 일반특성에 따른 변수인 부모가 안경 및 렌즈를 착용할수록, 형제 와 자매가 안경 및 렌즈를 착용할수록, 경제적으로 어려울수록 시력 저하 자가 많았고, 환경특성에 따른 변수인 거실 및 방안밝기가 어두울수록, 컴퓨터 사용 시 실내밝기가 어두울수록, TV의 눈높이 및 컴퓨터 모니터의 눈높이가 높을수록 시력 저하 자가 많았다. 안경 및 렌즈를 종속변수로 한 경우 중 일반특성에 따른 변수인 부모 및 형제와 자매가 안경 및 렌즈를 착용할수록, 경제적으로 어려울수록 시력 저하 자가 많았으며, 환경특성에 따른 변수인 거실 및 방안밝기의 실내밝기가 어두울수록, TV의 눈높이 및 컴퓨터 모니터의 눈높이가 높을수록 시력 저하 자가 많았다. 눈 건강상태를 종속변수로 한 경우 중 일반특성에 따른 변수인 경제적으로 어려울수록 시력 저하 자가 많았고, 건강행동특성에 따른 변수인 주관적인 건강상태가 나쁠수록, 눈 피로감이 있을수록 시력 저하 자가 많았으며 환경특성에 따른 변수인 거실 및 방안밝기의 실내 밝기가 어두울수록 시력 저하 자가 많았다. 시력저하관련 요인을 연구한 결과 학생들의 시력 저하 자가 매년 증가하고 있다는 것을 알 수 있었고, 유전적 요인에 의한 시력저하는 개인의 노력에 의하여 사전예방이 어렵지만 환경적 요인에 의한 시력저하는 노력과 관심으로 사전예방이 가능하므로 학생들의 시력건강증진을 위하여 학부모와 학교 및 전문 의료기관이 서로 연계적인 협조 하에 학생들 개개인에 맞는 효율적인 시력증진관리프로그램 개발하는 것이 필요하고, 현행학교시력검사의 정확성을 기하기 위하여 표준화된 시력검사 지침을 개발하여 사용할 필요가 있으며, 지역 및 환경적 배경이 다르다 보니 연구결과가 다르게 나타나는 경우가 있는데 객관적인 결과를 도출하기 위하여 여러 지역의 학생을 대상으로 다양하고 체계적인 연구를 해야 할 필요성이 있다고 생각한다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.48 no.10
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• pp.20-24
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• 2011

As various 3D contents have been developed recently, number of users who use 3D glasses in the cinema or their house has increased. However, since a stereoscopic image causes visual fatigue, developers also advise children and pregnant against watching it for hours. In this paper, we proposed measurement of level of visual fatigue degree by analyzing histogram obtained from a disparity-map. We used binocular disparity approach which is a fundamental factor occurred by a stereoscopic image. This research can be used as an user discomfort improvement method by referring to a stereoscopic image producing and compensation. To obtain a disparity-map, our proposed method used a census algorithm which is suitable for real-time processing.

• Science of Emotion and Sensibility
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• v.17 no.2
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• pp.35-44
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• 2014

The purpose of this paper is to investigate the readability of Nearly White background color in display environment. To perform the experiment, warmup experiment was carried out to for cognitive of whiteness using a Tablet PC. The experiment environment was by a indoor window seat under a mixture of fluorescent light and sunlight. The result of previous test was that the most whiteness perception was a color white a medium wavelength and followed by the short wavelength. The main experiment was to find readability, color combination and visual strains using 4 nearly whites background colors (Reddish, Greenish, Blueish, Yellowish) and one white background color, also text color is limited on black. As a result, readability and color combination had the highest score against a Greenish white background. Visual strain is also the lowest against a Greenish background. On the contrary, readability and color combination preference has the lowest score against the Reddish background. Visual strain is also the highest against a Reddish background. We propose the background color, which improves readability and reduces visual strain in visual display terminals environment through the research results.

• Journal of Broadcast Engineering
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• v.11 no.4 s.33
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• pp.441-447
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• 2006

See-through HMD type 3D display can provide an advantage of us seeing virtual 3D data used stereoscopic display simultaneously with real object(MR-Mixed Reality). But, when user sees stereoscopic display for a long time, not only eye fatigue phenomenon happens but also de-focus phenomenon of data happens by fixed focal point of virtual data. Dissatisfaction of focus adjustment of eye can be considered as the important reason of this phenomenon. In this paper, We proposed an application of multi-focus in see-through HMD as a solution of this problem. As a result, we confirmed that the focus adjustment coincide between the object of real world and the virtual data by multi-focus in monocular condition.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.42 no.2 s.302
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• pp.9-18
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• 2005

Flicker is the 'variation in brightness or he perceived won stimulation by intermittent or temporally non uniform light'. This phenomenon is blown as the cause of eye strain and headaches. Many researchers are dedicated to reducing this phenomenon. The flicker phenomenon also exists in PDP as some other display types, and is a critical problem in 50 Hz PDP. However, it is difficult to define flicker by more than one subjective judgment. So, an objective measurement of flicker is necessary and convenient for research on displays. In this paper, a computational prediction model is proposed which is used to predict luminance flicker (not chromatic flicker) by giving a quantitative output that describes the probability of occurrence of flicker. Through this work, we expected to provide a practical tool for flicker-free design in PDP.

• Journal of Digital Convergence
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• v.14 no.1
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• pp.363-370
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• 2016

The purpose of this study was to determine the influential factors associated with video display terminal (VDT) syndrome of male adolescents with digital device addition. The study design was cross-sectional descriptive survey. The study participants were 169 male middle school students in Seoul. A structured questionnaire was used for data collection and data were analyzed using the SPSS program. The factors most influential for the subjective symptoms of VDT were smartphone addiction, computer use time during the week, computer use environment. These factors accounted for 28.1% of the variance in subjective symptoms of VDT. In order to prevent the occurrence of VDT syndrome in students, we suggest to establish a preventive intervention against the digital addiction.

• Journal of KIISE
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• v.45 no.3
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• pp.251-279
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• 2018

Users can experience cybersickness when interacting with virtual reality (VR). The symptoms of cybersickness are similar to those of motion sickness which include eye fatigue, disorientation, and nausea. Despite the longstanding interest of user's discomfort, inconsistent results have been drawn on the underlying mechanisms and solutions of cybersickness. In this study, we propose an integrated view of cybersickness connecting causes of the symptoms, human perception model, and measurements of cybersickness. Cybersickness-related factors of previous research are reorganized into content, hardware, and human factors as well as analyzed in terms of VR fidelity. Also, pros and cons that measure the degree of cybersickness are discussed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.5
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• pp.584-590
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• 2020

Long-term use of digital screens in daily life can lead to computer vision syndrome including symptoms such as eye strain, dry eyes, and headaches. To prevent computer vision syndrome, it is important to limit screen usage time and take frequent breaks. There are a variety of applications that can help users know the screen usage time. However, these apps are limited because users see various screens such as desktops, laptops, and tablets as well as smartphone screens. In this paper, we propose and evaluate machine learning-based models that detect the screen device in use using color, IMU and lidar sensor data. Our evaluation shows that neural network-based models show relatively high F1 scores compared to traditional machine learning models. Among neural network-based models, the MLP and CNN-based models have higher scores than the LSTM-based model. The RF model shows the best result among the traditional machine learning models, followed by the SVM model.

• Journal of Broadcast Engineering
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• v.9 no.2
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• pp.131-141
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• 2004

Current binocular stereoscopic displays cause visual discomfort when objects with large disparities are present in the scene. One solution for improving visual comfort is synthetic depth-of-field processing, which simulates the characteristics of a human visual system. With this technique, visual comfort is improved by blurring portions of the background and/or foreground in the scene. However, this technique has the drawback of degrading overall image quality because the blurring is typically applied to both left and right images. To alleviate the visual discomfort, we propose a novel disparity-based asymmetrical filtering technique. Proposed technique applies the filtering to the image of one eye only, and controls the blur level according to the disparity information between stereoscopic images. We investigate the effects of this technique on stereoscopic video by measuring visual comfort and apparent sharpness. Our results indicate that disparity-based asymmetrical filtering can improve visual comfort of stereoscopic video while it maintains apparent sharpness if unfixated regions with large disparities are blurred under the appropriate filtering condition.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.1
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• pp.85-90
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• 2003

A Netspec lens has the form having the 2-dimensional mesh coating on a general ophthalmic lens. It is known that it makes the ophthalmic image see more clearly, reducing the ophthalmic fatigue and that the transmittance of it for ultraviolet and infrared rays is lower. We need to prove this characteristic scientifically. So, in this study, we applied the Kirchhoff's scalar wave theory to the Netspec lens and induced a transmittance expression. And we made the program of which simulation can explain the transmittance effect of the Netspec lens. Also, we tried the interpreting about the result of the simulation. Finally, we have known that this simulation program can be used to adjust the transmittance of the light according to the wavelength.