• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2015년도 춘계 종합학술대회 논문집
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• pp.411-412
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• 2015

형태 변형이 가능한 스마트 디바이스 관련 기술이 급성장하고 있다. 스마트폰과 스마트패드의 등장이 사용자들의 콘텐츠 활용방식에 큰 영향을 끼쳤던 것과 같이 스마트 디바이스의 형태 변형은 사용자들의 콘텐츠 활용 경험에 많은 영향을 미칠 것이다. 이에 이 연구에서는 미래 디바이스의 형태변화 유형을 Bendable, Foldable, Stretchable, Squishable로 정의하고 형태 변형을 인터랙션 관점에 따라 Input과 Output의 영역으로 분류하며, 분류된 유형별 특성을 기존 연구를 기반으로 콘텐츠 경험의 관점에서 분석하여 향후 각 유형별로 형태 변화가 콘텐츠 조작 및 소비에 미치는 영향을 정립 및 예측하였다.

• 한국기계가공학회지
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• 제13권3호
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• pp.111-117
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• 2014

With the development of technology, the display industry has been focusing on the development of new types of displays, such as bendable and wearable displays. However, the PVA/TAC polarizing film used in the manufacturing of a normal display is associated with low luminance and low efficiency. If the existing polarization film is replaced with a wire grid polarizer, it is possible to reduce the thickness significantly. Moreover enhanced brightness can also be expected. This study confirms the optical properties of the WGP through a simulation.

• Journal of Welding and Joining
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• 제32권3호
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• pp.34-42
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• 2014

Flexible devices have been developed from their rigid, heavy origins to become bendable, stretchable and portable. Such a paper displays, e-skin, textile electronics are emerging research areas and became a mainstream of overall industry. Thin film transistors, diodes and sensors built on plastic sheets, textile and other unconventional substrates have a potential applications in wearable displays, biomedical devices and electronic system. In this review, we describe current trends in technologies for flexible/wearable electronics.

• 한국표면공학회지
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• 제51권2호
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• pp.133-137
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• 2018

Plasma devices such as jets, pencils, and torches have been developed as new tools that help penetration of target agents and applied to plasma medicine. However, these devices cannot be used in a large area. Therefore, we introduced a flexible plasma device, which can be treated of large area and designed as bendable plasma. In additional, in vitro model based on agarose gel was prepared that can be show effectiveness in the depth of penetration. Plasma treatment conditions such as power, time and distance can be optimized on the agarose gel wound model. The chemical structure of changed polysaccharides was predicted due to reactive excited atoms and molecules, UV photons, charged particles and reactive oxygen and nitrogen species (RONS).

• Journal of Korean Dental Science
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• 제14권1호
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• pp.40-45
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• 2021

During orthodontic treatment of impacted teeth, use of appropriate anchorage against the traction force is important. Tooth anchorage with multi-bracket appliances is commonly used but sometimes it causes unwanted movements of adjacent teeth. Skeletal anchorage devices are therefore considered to minimize such side effects. Still their survival rate and positioning are highly limited according to the bone density and the interradicular space. This case report presents a case of two impacted teeth, one of which is dilacerated and horizontally angulated. Using the microplate with short screws and a bendable neck, negative effects on adjacent teeth were minimized and impacted teeth were repositioned with good stability.

• 한국멀티미디어학회논문지
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• 제25권7호
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• pp.932-944
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• 2022

Smartphones, are currently equipped with high-performance hardware to process large amounts of data and provide most of the functions provided by desktop PCs. In addition, the smartphones enable quick user authentication through biometric information collected from embedded sensors. However, the biometric authentication method is sometimes rejected due to social and cultural environment, security vulnerabilities, and misrecognition rate. Thus, conventional authentication methods such as PIN and pattern authentication are still mainly used. Consider the latest foldable and bendable smartphones. These devices may be vulnerable to social engineering attacks as they use conventional authentication methods without considering their form factors. In this study, therefore, we propose an authentication method using partial elements of PIN and pattern authentication as a way to increase the security of the conventional authentication methods and consider the recent form factors. According to the performance evaluation results, our method provides improved safety compared to the conventional methods.

• 한국방사선학회논문지
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• 제11권7호
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• pp.611-617
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• 2017

본 연구에서는 연성을 형광체 층이 가질 수 있다면 외부의 기계적 외력에 대하여 장기간 안정성을 확보할 수 있을 것으로 기대하였다. 이에 본 연구에서는 스크린 프린팅 공법을 통하여 유연한 $Gd_2O_2S:Tb$ 증감지를 제작하였고 장기적인 외력에 의한 피로누적과 반복적인 외력에 의한 피로누적에 따른 영향을 고찰하고자 RMS 분석과 히스토그램을 분석을 통하여 영상 균일도를 평가하였다. 연구 결과, 지속적인 외력에 대하여는 지배적인 픽셀 영역이 일정하게 유지되면서 RSD가 10% 이내를 만족하였으나, 반복적인 외력의 경우 지배적인 픽셀 영역이 3 영역으로 분할되며 영상 균일도에 악영향을 미치며 RSD가 10% 이상으로 증가하는 것으로 나타났다. 이러한 결과를 바탕으로 기존 방사선증감지에 대비하여 기계적 안정성을 확보함으로써 곡면 검출기의 적용 가능성을 제시하였으나 아직까지 플렉시블 검출기에 적용하기 위해서는 추가적인 연구가 필요할 것으로 사료된다. 이러한 결과 유연성을 가진 방사선 증감지는 다양한 곡면에 적용이 가능하므로 향후 핵의학, 치료용, 산업 분야 등과 같은 다양한 분야에 적용할 수 있을 것으로 기대된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.347.2-347.2
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• 2016

Recently, in order to improve the performance of the colloidal quantum dot solar cells (CQDSCs), various efforts such as the modification of the cell architecture and surface treatment for quantum dot (QD) passivation have been made. Especially, the incorporation of halides into the QD matrix was reported to improve the performances significantly via passivating QD trap states that lower the life-time of the minority-carrier. In this work, we fabricated a lead sulfide (PbS) QD bilayer treated with different ligands and utilized it as a photoactive layer of the CQDSCs. The bottom and top PbS layer was treated using metal iodide ($MI_x$ and butanedithiol (BuDT), respectively. All the depositions and ligand treatments were carried out in air using layer-by-layer spin-coating process. The fabrication of the active layers as well as the n-type zinc oxide (ZnO) layer was successfully carried out on the bendable indium-tin-oxide (ITO)-coated polyethylene terephthalate (PET) substrate, which implies that this technique can be applied to the fabrication of flexible and/or wearable solar cells. The power conversion efficiency (PCE) of the CQDSCs with the architecture of $PET/ITO/ZnO/PbS-MI_x/PbS-BuDT/MoO_x/Ag$ reached 4.2 %, which is significantly larger than that of the cells with single QD (PbS-BuDT) layer.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.13-13
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• 2009

We have investigated the fabrication and properties of bendable PZT film formed on plastic substrates for the application in flexible memory. These devices used the PZT active layer formed on $SiO_2/Si$ wafer by sol-gel method with optimized device layouts and Pt electrodes. After etching Pt/PZT/Pt layers, patterned by photolithography process. these layers were transferred on PET plastic substrate using elastomeric stamp. The level of performance that can be achieved approaches that of traditional PZT. devices on rigid bulk wafers.

• 한국정밀공학회지
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• 제30권5호
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• pp.552-558
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• 2013

In recent years the interest on flexible display has been increasing as a future display due to its bendable characteristics. An ITO(indium tin oxide) layer, which is part of a flexible display, can be broken easily while bending because it is made of brittle materials. This brittle property can cause the malfunction of flexible display. To analyze fracture characteristics of ITO layer, bending test was conducted commonly. However, it is not possible to know specific phenomena on bended ITO layer by simple bending test only. Accordingly, in this study, the FE(finite element) model is developed similarly to a real flexible display to analyze stress distribution of flexible display under bending condition, especially on ITO layer. To validate FE model, actual bending test was conducted and the test results were compared with the simulation results by measuring reaction forces during bending. By using the developed model, FE analysis about the effect of design parameter (Thickness & Young's Modulus of BL) on ITO Layer was performed. By explained FE analysis above, this research draws a conclusion of reliable design guide of flexible display, especially on ITO layer.