• Korean Journal of Optics and Photonics
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• v.20 no.4
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• pp.230-235
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• 2009

Photopolymer is evaluated as better material than the others used for hologram storage, due to many advantages, such as high diffraction efficiency, easy processing, and self-developing. In this study, chalcogenide inorganic compound ($SeO_2$) which has optical activity, was added to polyvinyl alcohol/acrylamide photopolymer films. In order to optimize diffraction efficiency of these photopolymer films, we prepared the photopolymer films with various film thicknesses and Eosin Y content. Diffraction efficiency of the photopolymer films were measured using a 532 nm laser at $40^{\circ}$ incident angle. As a result, the phtopolymer film with Eosin Y content of 0.0045 g and thickness of $297{\mu}m$ showed the highest diffraction efficiency (78.70%).

• Journal of Adhesion and Interface
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• v.14 no.4
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• pp.192-196
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• 2013

In this study, a series of bi-axially oriented films based on homo polypropylene (PP) and hydrocarbon resin (HCR) modified PP were prepared to investigate their mechanical properties, optical properties, permeability to gases and water vapors and shrinkage ratio. Hydrogenated dicyclopentadiene (DCPD) resin and hydrogenated C9 resin were used as HCR in this study. Bi-axially oriented polypropylene (BOPP) films made with PP/HCR blends showed better mechanical properties (higher Young's modulus), better optical properties (lower haze), lower permeability to gases and water vapors and increased shrinkage ratio than BOPP films made with homo-PP. Hydrogenated DCPD resin and hydrogenated C9 resin showed similar contribution to the improvement in mechanical properties and optical properties of BOPP films, but there are a differences in permeability to gases and water vapors and shrinkage ratio.

• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.25-28
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• 2011

본 논문은 광학 격자 필름과 평행 렌즈를 이용하여 무안경 3D 디스플레이 시스템을 구현한 연구이다. 기존 패럴랙스 배리어 시스템에서는 시점에 따라 크로스토크가 발생하는 영역과 역 입체시 영역을 갖게 되는데 이는 시청자가 정확한 3D영상을 볼 수 없도록 한다. 이를 평행 렌즈를 이용하여 좌, 우안에 해당하는 영상을 평행하게 이동시켜 설계된 격자 필름의 위치에 맺힐 수 있게 하고 격자 필름으로 빛을 굴절시켜 각 눈에 해당하는 영상만 볼 수 있는 영역을 갖게 하였다. 제안하는 방법을 이용해 크로스토크를 회피하여 보다 정확한 3D영상을 볼 수 있도록 한다.

• Polymer Science and Technology
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• v.14 no.6
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• pp.691-698
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• 2003

• Proceedings of the Optical Society of Korea Conference
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• 1998.08a
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• pp.222-223
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• 1998

• The Optical Journal
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• v.11 no.6 s.64
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• pp.47-48
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• 1999

• Polymer(Korea)
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• v.34 no.2
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• pp.133-136
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• 2010

Effect of solution film processing conditions on the dimensional stability of TAC film which is used as protection film of liquid crystal display (LCD) has been studied under hot and humid environmental condition (65 $^{\circ}C$, 90%). In addition, the mechanical and optical property changes due to the dimensional instability were also investigated. It was found that the fast solvent evaporation due to the increasing of methylene chloride content in solvent mixtures and decreasing dope concentration caused the lowering of dimensional stability under hot and humid condition. This dimensional stability change also affected the mechanical and optical properties of TAC films as well.

• Journal of Bio-Environment Control
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• v.23 no.4
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• pp.314-320
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• 2014

Three leaf vegetables, namely green lettuce, red lettuce (Lactuca sativa) and red-veined chicory (Cichorium intybus) were grown in minigreenhouses covered with two new functional films and conventional polyethylene film (PE). Seedlings of leaf vegetables were transplanted in a plastic troughs filled with soil-perlite mixture. Two functional films were made from polyolefin (PO) material. Measurement of optical characteristics showed that polyolefin films have better transmittance for the photosynthetic active radiation (PAR, 400-700nm) and higher absorptance for the ultraviolet radiation (UV, 300-400nm) in comparison with the conventional PE film. After three months of utilization higher loss in PAR transmittance was observed for conventional PE film. Leaf vegetables growth was enhanced and yield was increased in greenhouses covered by new functional films.

• Product Safety
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• s.57
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• pp.24-27
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• 1997

디지털 카메라란 일반적인 광학 카메라와 달리 렌즈를 통과한 피사체의 영상을 필름이 아닌 1과 0의 디지털 데이터로 메모리에 저장하는 첨단 카메라를 말한다. 따라서 기존의 카메라에는 필수적인 필름이 필요없게 되고 디지털 데이터를 보관할 수 있는 기억장치 또는 데이터를 외부의 기억장치에 전송할 수 있는 전송장치가 필요하다.

• Korean Journal of Optics and Photonics
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• v.20 no.2
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• pp.123-127
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• 2009

In order to improve the diffraction efficiency of the photopolymer, we prepared a $TiO_2$ added photopolymer and investigated the optical properties. Prepared photopolymer films are based on polyvinyl alcohol (PVA) as a polymer binder, acryl amide (AA) as a photo-polymerizable monomer, triethanolamine (TEOA) as an initiator, and eosin Y as a sensitizer at 532 nm. To prepare the photopolymer films with the uniform thickness, the constant amount (2.5 ml) of the photopolymer solution was dropped on the glass and spread using a spin coater. Then films were dried for 72 hrs in a darkroom ($20^{\circ}C$, 40% RH) prior to the optical measurement. Then, the diffraction efficiencies of both the photopolymer films containing $TiO_2$ and non-contained films were measured with the various incident angles ($20{\sim}70^{\circ}$). Therefore, $TiO_2$ added photopolymer showed 5% higher diffraction efficiency than neat photopolymer without $TiO_2$ addition. The addition of $TiO_2$ into the photopolymer showed the high diffraction efficiency (over 70%) at broad range ($20{\sim}70^{\circ}C$) of the incident angle.