• Proceedings of the KAIS Fall Conference
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• 2000.10a
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• pp.226-229
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• 2000

일반적으로 안경집은 일회적으로 사용하고 버리는 것이라 생각하는 사람이 많다. 안경집을 주로 생산하고 있는 대동사출금형과의 공동 노력으로 다기능성 안경집을 개발한 것을 소개한다. 일상적인 고정관념을 버리면 편리하고 기능성이 높은 제품을 만들 수 있다는 신념으로 개발한 결과 어린이나 젊은이들이 졸아할 문방구 겸용 안경집을 개발할 수 있었다. 완구는 소비자가 일상적으로 많이 접촉하기 때문에 곰팡이나 세균이 서식하지 않도록 항균 세라믹을 이용하여 항균처리하였다. 또한 상온에서 인체에 이로운 원적외선이 방출될 수 있도록 고안하였다. 단순한 색상의 무료함을 줄이기 위하여 어린이나 젊은이들이 좋아하는 상용화된 캐릭터를 사용하여 제품의 다양화를 꾀하였고, 4개의 조각으로 만들어 어린이들이나 젊은이들이 조립할 수 있도록 하여 흥미를 더할 수 있도록 하였다. 또한 소비자들이 선호하는 색을 알아보기 위하여 기존의 안경집을 활용하여 색상성호도 조사를 실시하였다. 젊은층은 자극적이고 화려한 색깔을 선호하는 한편 기성세대는 무난한 색깔을 선호하였다. 또한 콘택트 렌즈를 착용하는 경우에도 안경을 사용하는 경우가 많다. 이 경우 콘택트 렌즈와 안경을 따로 가지고 다녀야 하는 불편이 있다. 이에 착안하여 안경과 콘택트 렌즈를 겸용으로 사용하는 소비자를 위하여 안경과 콘택트 렌즈를 동시에 담을 수 있는 안경집을 개발(실용신안 출원번호:8928)하였다. 이 고안은 콘택트 렌즈를 안경집에 보관하기 위한 것으로 콘택트렌즈가 식염수에 잠겨 보관된 렌즈캡을 안경집내에 별도로 삽입되는 케이스에 수납하도록 구성하여 안경과 함께 콘택트 렌즈를 보관해 휴대하는 안경집 보관용 콘택트 렌즈 케이스에 관한 것으로 이것의 특징은 뚜껑이 열리고 닫히도록 구성된 안경집에 있어서 뚜껑 안쪽에 거울이 마련되고 뚜껑이 연결되는 선단부 안쪽에 끼움홈과 체결홈이 형성된 체결부를 갖는 안경집과 이것에 결합되는 체결구가 마련되어 개폐되는 커버가 형성된 케이스로 구성된다.로 금형설계 및 제작기간을 단축하고자 한다.ere demonstrated in rats after i.c.v., intraperitoneally and orally administration, respectively. The antiepileptical effects by the combination of compounds from ginseng; were compared with the iuluence of Rg1, Rb1, Rc and with the well known antiepileptical drugs such as carbamazepine, valproic acid. The base for the research is obtained by using the WAG/Rij strain (Luijtelaar, Coenen, Kuznetcova), an excellent genetic model for human generalized absence epilepsy. The improving action of gensinosides was effectively demonstrated on the model of electrical kindling of amygdala of WAG/Rij rats with genetically determined absences, and the influences of ginsenosides on the slow wave discharges have also been being investigated. The different characteristics of a kindling process exerted in the sex-different region of the amygdala and demonstrated that the level of sex steroids and content of neurosteroids in amygdaloid tissue ca

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.1
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• pp.69-77
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• 2014

Purpose: The functional ophthalmic lenses containing fluorine-substituted aniline group (2,4-difluoroaniline, 2,6-difluoroaniline, 3,4-difluoroaniline) were manufactured and the physical and optical characteristics of copolymerized ophthalmic lens were investigated. Methods: HEMA (2-hydroxyethylmethacrylate), NVP (N-vinyl pyrrolidone), MA (methacrylic acid), the cross-linker EGDMA (ethylene glycol dimethacrylate) and the initiator AIBN (azobisisobutyronitrile) were used as a basic combination and fluorine-substituted aniline group (2,4-difluoroaniline, 2,6-difluoroaniline, 3,4-difluoroaniline) were used as additives for preparing the hydrogel soft contact lenses. The hydrogel ophthalmic lens was manufactured by cast mould method and the ophthalmic lenses were stored in a 0.9% NaCl normal saline for 24 hrs. Results: The optical transmittance of the sample with addition 2,4-difluoroaniline showed that the UV-B(9.8~51.4%), UV-A(58.8~79.2%) and visible transmittance(87.0~90.4%). In the case of 2,6-difluoroaniline were measured the UV-B(80.2~83.2%), UV-A(85.8~86.4%), and visible transmittance(90.8~91.4%). Also, the optical transmittance of ophthalmic lens containing 3,4-difluoroaniline were measured the UV-B transmittance of 3.8~30.4%, UV-A transmittance of 47.8%~74.4% and the visible transmittance of 86.2~91.0% respectively. Conclusions: Based on the results of this study, 2,4-difluoroaniline and 3,4-difluoroaniline can be used effectively as additive for UV-blocking ophthalmic contact lenses.

• Korean Journal of Breeding Science
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• v.50 no.4
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• pp.453-462
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• 2018

This study was carried out to investigate the utilization value of legume crops collected in tropical and subtropical areas. We examined agronomic traits to assess domestic adaptability and evaluated useful components of foreign legumes. We used a total of 201 genetic resources of three legumes, consisting of 68 lentils, 72 chickpeas and 61 guars. The average number of days to flowering of the three legumes ranged from 56.7 to 60.8 days; the shortest in guar and longest in chickpea. The average number of days to growth of the three legumes ranged from the shortest 86.8 days in lentil, to the longest 163.9 days in guar. The maturation period of the three legumes lasted from the end of May until mid-September, based on sowing in March. However, the average yield of lentil was very low, ranging from 0.5 g to 30.6 g, with an average 16.4 g based on 10 plants per accession. The average 100 seed weight of the three legumes was 2.2 g for lentil, 22.9 g for chickpea, and 3.8 g for guar. The crude protein content ranged from 14.1% to 32.4% with an average of 20.4%, the highest for guar and the lowest for chickpea. The average crude oil content in the three legume crops was generally low, ranging from 0.8% in lentil, to 4.3% in chickpea. The average dietary fiber content in the three legume crops varied from 15.7% to 50.7%. Guar was the highest source of fiber, followed by chickpea (19.3%) and lentil (15.7%). From the agricultural traits analysis, chickpea and guar could grow domestically. However, lentil was difficult to flower and fruit normally during the warmer season after May. Therefore, lentil should be considered for late summer cropping during the cool season. The physicochemical properties of the three legumes seem to be useful as they are similar to, or better than, those of the control common bean.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.1332-1336
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• 2003

An experimental method is presented to maximize the replication quality of UV-molded micro-optical components. It is important to maximize the replication quality, because one can obtain the replicated micro-optical components with desired properties by accurate control of the shape. In the present study, a simple technique to avoid micro-air bubbles was first suggested. The effects of the UV-curing dose and the compression pressure on the replication quality of UV-molded structure were examined experimentally. Finally, as a practical application of the process design method, microlens arrays with diameters between 8 ${\mu}m$ and 96 ${\mu}m$ were fabricated by the present method, and the replication quality and the optical properties of the replicated microlens were measured and analyzed.

• Journal of the Korean Chemical Society
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• v.54 no.2
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• pp.222-227
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• 2010

This study added Au colloid in martial of conventional contact lens in various concentrations and copolymerized by heating at $70^{\circ}C$ for 40 minutes, $80^{\circ}C$ for 40 minutes, and finally, $100^{\circ}C$ for 40 minutes. Using the polymer produced through the copolymerization process, we have produced a contact lens and measured the physical characteristics which showed oxygen transmissibility of $9{\sim}12{\times}10^{-9}$ cm/s mL $O_2$/mL ${\times}$ mmHg, water content of 27.84% ~ 32.17%, refractive index of 1.432 ~ 1.443, visible transmittance of 83.2% ~ 89.5% and tensile strength of 0.141 kgf ~ 0.152 kgf. The polymer satisfied the physical properties required to produce contact lenses. Also, we judged that the polymer is suitable to be applied as a functional material for ophthalmological purposes.

• Korean Journal of Optics and Photonics
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• v.21 no.2
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• pp.41-45
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• 2010

In order to obtain thinner and brighter backlight units (BLU), we simulated a new-type backlight unit. A micro-lens array sheet was formed on the upper plane of the light guide plate (LGP) comprising the backlight unit. Also, in order to match with the LGP, we simulated a functional optical sheet. The conventional BLU uses one LGP and four optical sheets, but we simulated a BLU that uses one optical sheet. Simulation results have revealed that our BLU can achieve the same luminance and 30% better view angle as compared with conventional ones.

• Journal of the Korean Chemical Society
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• v.53 no.5
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• pp.542-546
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• 2009

Recently, silver has been applied to various fields due to antimicrobial property and high conductivity. We manufactured high-performance ophthalmic material containing silver which could protect eye from environmental factors. We mixed $AgNO_3$ with conventional contact lens material. And then we copolymerized at 70 ${^{\circ}C}$ for 40 minutes under water bath, and estimated antimicrobial activity and physical properties. We used solid culture and liquid culture medium for antimicrobial test. The results of contact lens containing silver showed good antibiosis. In case of physical properties, the results showed 32.35%(water content) and 88.34% (visible transmittance) for each. We judged that we made the copolymer with antimicrobial and physical properties which is suitable for conventional contact lens.

• Journal of the Korean Chemical Society
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• v.53 no.6
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• pp.755-760
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• 2009

Styrene is broadly used as a polymer and a copolymer and is useful in manufacturing contact lenses due to its high refractive index. This study used styrene with the cross-linker EGDMA (ethylene glycol dimethacrylate), HEMA (2-hydroxyethyl methacrylate) and the initiator AIBN (azobisisobutyronitrile) for copolymerization. Measurement of the physical characteristics of the copolymerized material showed that the refractive index is 1.4412 - 1.4628, water content 20 - 35%, visible transmittance 82.6 - 87% and the tensile strength 0.143 - 0.344 Kgf. Also, measurements showed that the refractive index and tensile strength increased while the water content decreased as the ratio of styrene increased. Based on the results of this study, the produced copolymer can be estimated to be suitable for use as a material for high performance functional contact lenses.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.420-424
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• 2016

In this study, we developed photocatalytic technology to address the emerging serious problem of air pollution through indoor air cleaning. A single layer of $WO_3$ was prepared by using the dry process of general RF magnetron sputtering. At a base vacuum of $1.8{\times}10^{-6}$[Torr], the optical and electrical properties of the resulting thin films were examined for use as a transparent electrode as well as a photocatalyst. The single layer of $WO_3$ prepared at an RF power of 100 [W], a pressure of 7 [mTorr] and Ar and $O_2$ gas flow rates of 70 and 2 sccm, respectively, showed uniform and good optical transmittance of over 80% in the visible wavelength range from 380 [nm] to 780 [nm]. The optical catalyst characteristics of the $WO_3$ thin film were examined by investigating the optical absorbance and concentration variance in methylene blue, where the $WO_3$ thin film was immersed in the methylene blue. The catalytic characteristics improved with time. The concentration of methylene blue decreased to 80% after 5 hours, which confirms that the $WO_3$ thin film shows the characteristics of an optical catalyst. Using the reflector of a CCFL (cold cathode fluorescent lamp) and the lens of an LED (lighting emitting diode), it is possible to enhance the air cleaning effect of next-generation light sources.