• 한국진공학회:학술대회논문집
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• 한국진공학회 1999년도 제17회 학술발표회 논문개요집
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• pp.227-227
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• 1999

Plasma display panel(PDP) is a leading technology for large-area flat panel displays. A current issue in operating the PDP cell is that the efficiency of the PDP cell is very low. To increase the efficiency of the PDP cell, the visible light needs to be maximized and the power consumption minimized. Since the excited xenons are related to the production of the visible light, it is important to optimize the cell geometry and the gas composition that produce the excited xenons more efficiently. A 2D-fluid code (FL2P) is developed and used to simulate the plasma dynamics and the radiation transport in the PDP cell. The cell is optimized with the code for various operating conditions and cell dimensions such as the voltage pulse, electrode length, electrode spacing, gap size, dielectric constant, gas mixture ratio, pressure, and pulse duration.

• 한국안전학회지
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• 제15권1호
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• pp.153-160
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• 2000

Occupational cumulative traumas (CTDs) are becoming one of leading ailments in industrialized worl $d^{(1.2)}$. The degree of muscle fatigue is important parameter to understand cause of occupational cumulative trauma disorders. To quantify degree of muscle fatigue, muscle EMG activity was measured during isometric and dynamic contractions(repetitive concentric/eccentric muscle contraction) and its analyzed data, such as RMS, median frequency, and median power were compared when the muscle was fresh and exhausted. When muscle become fatigue, it was observed that median frequency decreased and median power and RMS increased However, based on overall prolonged observation, median frequency increased and median power and RMS decreased. Therefore it was concluded that shifting patterns of RMS, median frequency, and median power values can be used as parameter to evaluate degree of muscle fatigue even in dynamic muscle contraction.

• Steel and Composite Structures
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• 제35권4호
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• pp.567-578
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• 2020

Based on third-order shear deformation shell theory, the present paper investigates post-buckling properties of eccentrically stiffened metal foam curved shells/panels having initial geometric imperfectness. Metal foam is considered as porous material with uniform and non-uniform models. The single-curve porous shell is subjected to in-plane compressive loads leading to post-critical stability in nonlinear regime. Via an analytical trend and employing Airy stress function, the nonlinear governing equations have been solved for calculating the post-buckling loads of stiffened geometrically imperfect metal foam curved shell. New findings display the emphasis of porosity distributions, geometrical imperfectness, foundation factors, stiffeners and geometrical parameters on post-buckling properties of porous curved shells/panels.

• 전자통신동향분석
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• 제32권6호
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• pp.1-7
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• 2017

A metamaterial is a material engineered to have a property that does not exist in nature. A designable material property can be achieved by tailoring its structure, and thus a metamaterial is a novel ICT material and component technology that can break through the limitations of conventional technologies. Among the metamaterials available, a perfect metamaterial absorber is a technology that can nearly absorb light, sound waves, thermal waves, and electromagnetic waves with a simple structure, and has been of significant interest in energy, display, sensor, stealth, and military applications, with wavelengths from visible light to microwaves. In this article, we introduce a brief description of metamaterial absorber technology, the critical issues for its application, as well as ETRI's developed metamaterial absorber technology and its prospects for future use.

• 전자통신동향분석
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• 제33권5호
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• pp.95-102
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• 2018

With the widespread use of multifunctional devices, haptic sensation is a promising type of sensory channel because it can be applied as an additional channel for transferring information for traditional audiovisual user interfaces. Many researchers have shed new light on non-contact haptic displays for their potential use on ambient and natural user interfaces. This paper introduces several of the latest schemes for creating a mid-air haptic sensation based on their transfer medium: ultrasonic phased arrays, air nozzles, thermal and plasmonic lasers, and electromagnets. We describe the principles used in delivering haptic sensation in each technology, as well as state-of-the-art technologies from leading research groups, and brief forecasts for further research directions.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2006년도 학술발표대회 논문집
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• pp.181-191
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• 2006

As an alternative to traditional life testing, degradation tests can be effective in assessing product reliability when measurements of degradation leading to failure can be observed. This article proposes a new model to describe the nonlinear degradation paths caused by nano-contamination for plasma display panels (PDPs) : a bi-exponential model with random coefficients. A sequential likelihood ratio test was executed to select random effects in the nonlinear model. Analysis results indicate that the reliability estimation can be improved substantially by using the nonlinear random-coefficients model to incorporate both inherent degradation characteristics and contamination effects of impurities for PDP degradation paths.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 1부
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• pp.145-148
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• 2011

As a futuristic construction model, building information model(BIM) based project management system(PMIS) and mobile PMIS have been showing visible sign. However, researches on the 3D BIM based PMIS using mobile device are hard to find, result from limitation of mobile device application(slow speed at huge BIM file, display size, and etc.) and undefined standard of business processes. Therefore, this research aims at studying feasibility of mobile BIM PMIS based on cloud computing as a business model. In case of applying mobile BIM PMIS, 3D drawings and integrated building informations are possible on mobile devices in real time. it would support increasing the productivity of project participants as designer, engineer, supervisor, and etc. Globally, BIM based PMIS and Mobile BIM system, cloud computing based mobile BIM simulator are in the concept or experimental phase, therefore it is possible to secure global leading technology of IT and construction merger in the mobile BIM.

• International Journal of Contents
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• 제17권1호
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• pp.27-36
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• 2021

Information design is a new scientific subject, which was named in the 20th century. The design methods of information design and the display of information are continually evolving with the change in the world. While sorting out the background and concept of information design, this article aims to identify the issues of information design. One issue is that environmental information design is a vague concept. Thus, leading to this type of information design is without any comprehensive analysis. Second, the impact of culture has not received adequate attention. This article is based on the Japanese Wabi-sabi culture. It analyzes the impact of culture on information design. The article deeply explores the role of Wabi-sabi in information design through case studies, and it reflects the characteristics of design products by culture.

• 전기전자학회논문지
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• 제13권4호
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• pp.116-124
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• 2009

근래 휴대 단말기용 모뎀 칩셋이나 멀티미디어 프로세서의 CPU성능은 노트북PC에 버금가는 수준으로 향상되면서 휴대단말기가 전자기기의 컨버전스화를 주도하는 아이콘으로 떠오르고 있다. 더불어 DMB, 디지털 카메라, 화상통화, 인터넷 검색 등이 기본적으로 제공되면서 소형크기의 휴대 단말기용 디스플레이에서도 화질에 대한 관심이 높아지고 있다. 휴대단말기의 경우 야외에서 태양광과 같은 주변광원의 변화로 동일한 영상이 열화 또는 과도하게 밝아져 보이는 야외 시인성 문제를 해결해야 하며, 더구나 최근 터치방식 패널이 휴대단말기 디스플레이 장치에 사용되면서 ITO 필름에 의한 투과율 손실로 디스플레이 화면의 컨트라스트 저하가 더해지고 있다. 본 논문에서는 휴대 단말기용 영상개선 SoC를 위해 영상 개선 알고리즘을 개발하였고 이에 대한 성능 비교를 수행하였다. 컨트라스트 개선을 위해 적응형 기법으로 Clipped Histogram Stretching을, 정적 기법으로 S형 곡선조정과 Gain 조정 기법을 사용하였고 야외 시인성 개선을 위해서는 CIELCh 색공간에서 외부 조도센서의 정보에 따라 명도(Lightness)와 채도(Chroma)가 조절될 수 있도록 하였다. 개발한 알고리즘에 대한 성능평가는 결과영상의 히스토그램, RGB 화소값 분포도, 엔트로피 그리고 동적영역 확장비 등을 통해 분석을 진행하였다.

• 자원리싸이클링
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• 제22권2호
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• pp.29-36
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• 2013

국내의 디스플레이 산업규모는 2007년 기준으로 48조원, 판매대수로는 324만대 이상으로 세계 최대 임에도 불구하고 폐 디스플레이 대부분은 소각 및 매립되어 처리되는 실정이다. 평판 디스플레이의 제품 순환 주기가 매우 짧은 것을 감안하면 대략 5년 사용 후 폐기 시 2015년부터는 약 400~500만대의 폐 디스플레이가 국내에 발생할 것으로 예측된다. 2003년부터 EU의 WEEE 재활용 관련 입법의 영향으로 폐 제품의 재활용 및 재자원화는 어느 때 보다 국가적으로 절실한 경제 사회적 이슈가 되었다. 폐 디스플레이에는 금, 은 등의 귀금속이 함유되어 있어 재활용의 경제적 부가가치도 크다. 이와는 별도로 최근 중국의 희소 금속과 희토류의 수출 제한으로 대두된 자원 확보의 측면에서도 폐 디스플레이의 재활용을 통한 인듐 등의 희소금속 소재화는 필수 불가결하다. 그러므로 우리나라에서도 환경적, 사회 경제적, 국가 전략적 측면에서의 파급효과를 종합적으로 고려한 통합 재활용 기술관련 연구 개발 및 이의 상용화가 시급하게 이루어져야만 할 것이다. 이에 본 연구에서는 특별히 LCD의 해체, 분리 공정의 최적화를 통한 해체/분해 절차서 작성, 모듈/부품의 유가 소재 비율 조사를 체계적으로 실시하였다. 이러한 해체/분리 공정 최적화 연구를 통하여 최종적으로 폐 디스플레이 통합 재활용 전체 공정도를 제안하였다.