• 대한인간공학회지
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• 제30권6호
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• pp.739-747
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• 2011

Objective: The present study evaluated information presentation methods applicable to a wearable Braille display in terms of performance and satisfaction measures. Background: A Braille display wearable at a finger can improve accessibility of information for the blind by presenting information in real time. Method: A Braille display with six pins operated by DC servomotors was developed to simulate four information presentation methods(active, stationary, simultaneous, and sequential methods). An evaluation experiment was conducted with 16 participants(8 normal and 8 blind participants) by using three objective measures(reaction time, RT, unit: sec; recognition time, CT, unit: sec; correct response percentage, CP) and two subjective measures(overall satisfaction, OS; perception easiness, PE) with a 7-point scale. Results: The average RTs and CTs of the active and stationary methods were significantly shorter than those of the simultaneous and sequential methods for the blind participants. Also, the average CPs, OSs, and PEs of the active and sequential methods were significantly higher than those of the stationary and simultaneous methods. Conclusion: The active and sequential methods were preferred to the other methods for the blind. Application: The performance characteristics identified in the present study for the four braille display methods can be utilized to develop an effective wearable Braille display system.

• 한국멀티미디어학회논문지
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• 제24권8호
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• pp.1076-1089
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• 2021

Among the currently used knowledge-based authentication methods for smartphones, text and graphic-based authentication methods, such as PIN and pattern methods, use a display unit and a touch function of the display unit for input/output of secret information. Recently released smartphone form factors are trying to transform into various forms, away from the conventional bar and slate types because of the material change of the display unit used in the existing smartphone and the increased flexibility of the display unit. However, as mentioned in the study of D. Choi [1], the structural change of the display unit may directly or indirectly affect the authentication method using the display unit as the main input/output device for confidential information, resulting in unexpected security vulnerabilities. In this paper, we analyze the security vulnerabilities of the current mobile user authentication methods that is applied atypical form factor. According to the analysis results, it seems that the existing display-dependent mobile user authentication methods do not consider emerging security threats at all. Furthermore, it is easily affected by changes in the form factor of smartphones. Finally, we propose countermeasures for security vulnerabilities expected when applying conventional authentication methods to atypical form factor-based smartphones.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2005년도 춘계 학술발표대회 논문집
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• pp.198-199
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• 2005

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1425-1428
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• 2006

We have proposed a novel cleaning technology with organic nanoparticles for high-performance TFT array. The surface of the TFT layer becomes more hydrophilic after cleaning by the nanoparticles. This is concluded from the comparison of contact angles for the samples cleaned by various methods. It is found that the drain currents in the subthreshold and off-state regions are less than those for the TFTs cleaned with conventional method.

• 디지털융복합연구
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• 제10권10호
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• pp.497-504
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• 2012

본 연구는 사용자의 인지적 측면에서 정보의 효율성을 높이기 위한 고찰로써, 정보의 노출빈도와 인지도의 관계에 따른 정보의 유형과 속성에 따른 표현 기법을 제안하였다. 인지공학과 인지심리학 분야의 문헌연구를 통해 노출빈도와 인지도의 상관관계를 규명하였고, 이를 바탕으로 다음과 같은 연구결과를 얻었다. 첫째, 사용자의 인지적 요구를 파악 할 수 있도록 하는 '프레임웍'으로써의 정보유형과 유형별 시각화 속성을 제안하였다. 세부적으로 정보 노출 빈도와 정보의 인지도에 따른 STM, STA, LTM, LTA 4가지 정보 유형과 각 유형에 관한 인지적 특성, 14가지 고품질 정보의 시각화 속성을 유형별로 재분류한 '시각화 속성 매트릭스'를 제안하였다. 둘째, 정보 콘텐츠 제작에 있어서 필요한 정보 깊이에 따른 표상방식에 대한 가이드라인을 제안하였다. 1차적 정보로서 STM, STA 정보의 표현기법으로 "독특속성", "선행 조직자(Advance Organizer)", "단계적 정보공개(Progress Closure)", "행위유발단서(Affordance)"를 제안하였으며, 다차원 정보로서 LTM 정보 표현기법으로 "모듈방식(Modularity)", "일관성(Consistency)", "모방(Mimicry)", "기억술(Mnemonic Device)"를 제안하였다. 본 연구를 통한 주요 발견점으로 정보의 유형과 깊이에 따라 정보의 시각화 속성의 중요도에 차이가 나타나며, 이에 따라 정보 표현기법이 달라 질 수 있음을 발견하였다.

• 한국콘텐츠학회논문지
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• 제16권10호
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• pp.483-491
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• 2016

본 연구의 목적은 '정보의 즉각적 인지가 가능하면서 미적 문화적 특수성을 내재'하고 있는 STA(Short-term Attractive) 정보의 인지적 특성을 파악하고 그에 맞는 시각화 속성과 표현 방법을 모색하는 것이다. 정보디자인과 인지심리학을 바탕으로 STA 정보의 인지적 특성을 도출하고, 정보의 노출빈도와 인지도 관계에 따른 정보 속성에 관한 선행연구를 토대로 STA 정보의 시각화 속성 네 가지를 도출하였다. 정보 인지적 측면에서 STA 정보의 주요 시각화 속성인 '이해 할만한(Understandable)', '간결성(Conciseness)'에 대한 주요 표현 방법으로 은유, 환유, Indexical Image와 Context의 활용, 수사학, 기억보조장치(Mnemonic Device)를 제안하였다. 정보의 감성적 지각 측면에서는 주요 시각화 속성인 '타당성(Relevance)', '가치 있는(Valuable)'에 대한 주요 표현 방법으로 익살, 패러디, 특수성, 친근감, 키치, 조형적 아름다움, 새로움을 제안하였다. 본 연구의 결과를 바탕으로 향후 표현 방법들과 정보 적용 환경에 따른 인지도 관계 분석을 진행하고자 한다.

• Journal of Information Display
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• 제11권1호
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• pp.17-20
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• 2010

With the increasing demand for a better FPD image quality, better evaluation metrics and advanced display quality measurement methods are required to meet these needs. There are many measurement methods for evaluating the viewing angle of various display devices, but these methods, which include luminance drop, color shift, and contrast ratio decrease, are imperfect considering that human perception does not completely correlate to them. In this paper, a new method of measuring the perceptual angle of FPDs is proposed, considering human visual perception, which uses the color space of the color appearance model.

• Journal of Information Display
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• 제13권4호
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• pp.167-177
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• 2012

Cold cathode fluorescent lamps (CCFLs) are used to provide lighting for liquid crystal displays (LCDs). This paper presents a set of guidelines for measurement characterization and design to reduce the power consumption of CCFL LCD backlight inverters and panel electronics. The proposed methods aim to reduce the backlight power consumption by fine-tuning a back-light inverter for a specific LCD, using several methods. First, the authors describe their power measurement methodology; and next, they identify different areas for tuning a backlight inverter for a given display. The experiment results showed that power savings can range from 50 to 200mW if the backlight inverter is properly tuned. This paper also proposes an optimized configuration for light-emitting device (LED) panels to reduce power loss by selecting a LED with a specific input voltage and number of cells to help minimize power loss.

• Nuclear Engineering and Technology
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• 제45권2호
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• pp.141-150
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• 2013

There is mounting evidence that complex computer system displays in control rooms contribute to cognitive complexity and, thus, to the probability of human error. Research shows that reaction time increases and response accuracy decreases as the number of elements in the display screen increase. However, in terms of supporting the control room operator, approaches focusing on addressing display complexity solely in terms of information density and its location and patterning, will fall short of delivering a properly designed interface. This paper argues that information complexity and semantic complexity are mandatory components when considering display complexity and that the addition of these concepts assists in understanding and resolving differences between designers and the preferences and performance of operators. This paper concludes that a number of simplified methods, when combined, can be used to estimate the impact that a particular display may have on the operator's ability to perform a function accurately and effectively. We present a mixed qualitative and quantitative approach and a method for complexity estimation.

• Journal of Information Display
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• 제2권2호
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• pp.13-21
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• 2001

We propose a universal image processor for a-Si TFT LCD of UXGA class that can display the full screen on the LCD panel with low resolution of video sources such as NTSC, VGA, SVGA, XGA, and SXGA by using the proposed interpolation filter. In addition, we propose a real-time contrast controller for image improvement of multi-gray scale image. The operation of the proposed methods has been verified using Synopsys VHDL and computer simulation. Results show that the proposed methods might be suitable for a UXGA LCD controller for real-time image improvement.