• 한국포장학회지
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• 제23권3호
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• pp.133-141
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• 2017

본 논문에서는 신선도 유지 기능을 부여한 새로운 형태의 산화생분해성 필름 개발에 관하여 서술하였다. 생분해 촉매제로 유기 금속염, 유기산, 불포화 지방산등을 함유한 산화생분해성 및 항균신선도기능을 부여한 M/B를 각각 제조한 후, 이를 플라스틱 레진에 첨가하여 항균 및 신선도 기능의 산화생분해 복합필름(AOB film)을 제작하였다. 제조된 항균신선도 A M/B의 항균력 시험은 진탕 플라스크 방법을 사용하여 농도별 시험을 실시하였다. A MB 5% 첨가한 AOB 필름은 별도로 필름 밀착법을 통해 제조하여 실험한 결과, 필름의 항균작용이 매우 우수함을 확인할 수 있었다. 자두를 대상으로 한 신선도 유지기능 평가 결과, A M/B 5% 첨가한 AOB 필름이 대조군 필름에 비하여 신선도 유지 효과가 우수하였다. 또한 산화생분해성을 평가하기 위하여, UV 340 nm로 처리한 필름의 인장강도 및 신장율을 측정한 결과, AOB 필름의 물성 감소율이 우수하였으며, 이는 산화생분해 특성을 갖는 것을 의미한다. 결론적으로 항균 및 신선도 기능의 산화생분해성(AOB) 복합필름은 식품 유통과정에서 발생할 수 있는 식품의 부패를 방지하는 측면에서 긍정적인 효과를 가져올 수 있을 것으로 판단되어진다.

• 대한의생명과학회지
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• 제26권4호
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• pp.360-367
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• 2020

Tuna skin byproduct extract (TSB) was used as a biocompatibility film base material, and its composite film with gellan gum (GG) was prepared. In addition, Pinus thunbergii cone extract (PTCE) was incorporated into the film to provide anti-oxidant and anti-bacteria activities. The tensile strength (TS) of the TSB/GG composite films increased with increasing GG content, whereas elongation at break (E) decreased. TSB/GG film at a ratio of 0.5:0.5 (w/w) showed the most desirable TS and E values. Based on scavenging free radical potentials and disc diffusion method results against growth of bacteria, antioxidant and anti-bacteria activities of films increased with increasing PTCE concentration. Accordingly, this study showed that TSB/GG could be used as a film material while the TSB/GG composite film containing PTCE can be utilized as functional packaging.

• 생물환경조절학회지
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• 제9권3호
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• pp.156-160
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• 2000

플라즈마 필름은 플라스틱 필름 표면의 유적성을 향상시키기 위하여 고전압처리 되었다. 플라즈마 필름과 계면활성제 필름(대조구)를 각각 직경 25mm 두께 1.5mm 골조 파이프 하우스에 피복하였다. 또한 40일 플러그 육묘된 풋고추를 110cmx25cm 간격으로 정식하였다. 피복시 수온을 7$0^{\circ}C$로 처리된 수적발생 장치에서 나온 수증기가 필름 표면에서 응결되어 흘러내려 비이커에 모인 양을 150분 후에 측정한 결과, 플라즈마 필름에서 2.56mL.100$cm^{-2}$ , 계면활성제 필름에서 0.94mL.100$cm^{-2}$ 이 나왔다. 피복 60일 후 오전 8시 20분에 시설내 필름 표면에 부착된 수적량은 플라즈마 필름에서 0.34mL.100$cm^{-2}$ , 계면활성제필름에서 0.32mL.10$cm^{-2}$ 이었다. 광 투과율은 플라즈마 필름 피복시설이 계면활성제 피복시설 보다 2.0% 높았다. 그리고 시설내 기온은 플라즈마 필름 피복시설이 계면활성제 피복시설 보다 0.5$^{\circ}C$ 높았다. 그러나 상대습도는 차이가 없었다. 풋고추 초장, 엽면적, 건물중 및 초기수량 또한 처리간에 차이가 없었다.

• 한국산업융합학회 논문집
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• 제23권6_2호
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• pp.1067-1074
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• 2020

Green houses provide a more conditioned and warmer environment than the outside environment due to insulation. Currently used insulation materials include soft film (PVC, PE, EVA), foamed PE sheet, non-woven fabric, reflective film, and multi-layer insulation curtain, but there are many disadvantages and to compensate for this, silica aerogel insulation material with excellent warmth, light weight, and small volume Research using is in progress. In this study, the temperature change of the quadruple-structure green house and the temperature change in the dual-structure green house of soft film and silica airgel were investigated. The daytime temperature change was highest in A and A2 (soft film) at 10 to 16:00 after sunrise, but showed the lowest temperature at 17 to 18:00, which is the sunset time, showing the greatest change. The airgels of D and D2 showed the smallest change in temperature after sunrise and right after sunset. That is, it can be said that the airgel is hardly affected by external temperature. The temperature change at night was highest in D and D2 (aerogel) for both quadruple and dual structures. The temperature at night was measured higher in the quadruple structure than in the double structure. As for the ratio of the internal temperature to the external temperature for the quadruple structure and the double structure, D (aerogel) was not affected by the external temperature during the day in the quadruple structure and the double structure. D (Aerogel) seems to be able to reduce the damage caused by high temperatures in summer due to the high thermal insulation effect of the airgel, as the temperature rises above 4℃ at night. And in winter, it helps to save heating costs due to less heat emitted to the outside.

• 센서학회지
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• 제22권5호
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• pp.357-363
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• 2013

An ultraviolet pulsed laser ablation of polyimide film coated with platinum has been used to enhance the sensitivity for the application as an electrochemical biosensor. Densely packed cones are formed on polyimide surface after UV irradiation which results in increase of surface area. In order to apply the sensitivity improvement of laser ablated polyimide film electrodes, the glucose oxidase modified biosensor was fabricated by using an encapsulation in the gel matrix through sol-gel transition of tetraethoxysliane on the surface of laser ablated polyimide film. The optimum conditions for glucose determination have been characterized with respect to the applied potential and pH. The linear range and detection limit of glucose detection were from 2.0 mM to 18.0 mM and 0.18 mM, respectively. The sensitivity of glucose biosensors fabricated with laser ablated polyimide film is about three times higher than that of plain polyimide film due to increase in surface area by laser ablation.

• 생물환경조절학회지
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• 제21권4호
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• pp.312-316
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• 2012

본 연구는 비닐하우스 피복재인 폴리오레핀(PO)계 필름의 효과를 구명하고자 관행의 피복필름(PE + EVA)과 비교하여 피복재별 물리적 특성과 상추와 오이의 생육 및 수량을 검토하였다. 인장강도, 인열강도 등 피복재의 물리적 특성은 일반필름보다 PO필름이 우수하였다. 400~700 nm의 광합성유효광의 투과율은 일반필름에 비해 PO필름이 4.1% 높았고, 전체 광선투과율(300~1,100 nm)도 PO필름이 4.3% 높았다. 하우스 내의 주간 평균기온은 일반필름보다 PO필름이 $1.5^{\circ}C$ 높았고, 야간 평균기온도 PO필름이 $0.8^{\circ}C$ 높게 유지되었다. 주야간 상대습도는 필름 간에 유의적 차이가 없었다. 엽록소 함량은 오이의 경우 필름 간 유의적 차이는 없었으나 일반필름에 비해 PO필름이 엽록소 a가 약간 높았으며, 상추는 PO필름이 일반필름보다 유의하게 높았다. 수확기 오이 생육에 있어서 초장, 엽면적, 생체중 및 건물중 모두 일반필름보다 PO필름을 피복한 하우스에서 크고 무거웠다. 수확한 오이의 과실 수량은 일반필름에 비해 PO필름이 14.0% 높았고, 상추 수량도 일반필름보다 PO필름이 13.6% 높았다.

• International Journal of Industrial Entomology and Biomaterials
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• 제30권2호
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• pp.81-85
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• 2015

Recently, many researchers have studied silk sericin because of its high water retention, good wound healing, good cyto-compatibility, and blood-glucose- and cholesterol-lowering effects. Although sericin film can be used in wound dressing and cosmetic packs, its poor mechanical properties have prevented its use in industrial fields. In the present study, sericin was obtained from different silkworm varieties, and the effect of silkworm variety on the structure and properties of sericin was examined. Except for a small difference in serine content, no significant difference in sericin was noted among the silkworm varieties. In addition, silkworm variety almost had no effect on solution viscosity, implying that it does not influence the molecular weight of sericin. Mechanical properties of sericin film were strongly affected by silkworm variety. Wonwon 126 showed the best mechanical properties, while N74 and Geumgwangju displayed the worst properties.

• 농업과학연구
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• 제50권3호
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• pp.497-505
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• 2023

This study evaluated the impact of rain shelters made of plastic film on spring frost damage and fruit quality in Asian pears ('Niitaka') over two years. In 2021, during the coldest spring days (between 0:00 am and 7:00 am), temperatures dropped to -1.20 - 0.43℃ at 120 cm and -1.33 - 0.57℃ at 200 cm above ground level in the control. Conversely, the rain shelter treatment maintained higher temperatures, -0.40 - 0.87℃ at 120 cm and -0.43 - 0.77℃ at 200 cm. Flower damage was significantly lower in the rain-sheltered group, with incidences of 1.3 and 6.9% at 120 and 200 cm, respectively, compared with 18.1 and 22.6% in the control group. Visual observations verified the prevention of frost adhesion on flower organs in the sheltered group, compared with noticeable pistil death and petal browning in the control group. In 2022, when temperatures remained above 0℃, fruitlet stalk length was 5 - 6 mm longer in the sheltered group. The cumulative impact of rain shelters was evident in the improved fruit quality over the two years. This study suggests resilient cultivation strategies in the face of climate change to reduce frost damage, increase productivity, improve fruit quality, and potentially increase incomes of the farmers.

• Elastomers and Composites
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• 제58권3호
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• pp.112-120
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• 2023

Herein, we propose a facile water-processible method to develop an eggshell membrane (ESM)-embedded waterborne polyurethane (WPU)-based bio-degradable and bio-compatible coating material that exhibits attractive tactile properties. Virgin ESM is not dispersible in water. Hence, to develop the ESM-based WPU composite, soluble ESM (S-ESM) was first extracted by de-crosslinking the ESM. The extracted S-ESM at different concentrations (0, 0.5, 1.0, 1.5 wt %) was mixed with WPU. Compared to virgin WPU, the viscosity of S-ESM/WPU dispersion and the in-plane coefficient of friction (COF) of the composite film surfaces decreased with an increase in the S-ESM content. In addition, an increase in the S-ESM content improved the tribo-positive characteristics of the film. Different good touch-feeling biomaterials, such as fur, feather, and human skin exhibit tribo-positivity. Thus, the enhanced tribo-positive characteristics of the S-ESM/WPU and the decrease in their COF owing to an increase in the S-ESM content imply the enhancement of its touch-feeling performance. The S-ESM embedded WPU composites have potential applications as coating materials in various fields, including automobile interiors and artificial leather.

• Journal of information and communication convergence engineering
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• 제4권4호
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• pp.158-161
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• 2006

[ $Bi_2Sr_2Ca_nCu_{n+1}O_y(n{\geq}0)$ ] thin film is fabricatedvia two different processes using an ion beam sputtering method i.e. co-deposition and layer-by-layer deposition. A single phase of Bi2212 can be fabricated via the co-deposition process. While it cannot be obtained by the layer-by-layer process. Ultra-low growth rate in our ion beam sputtering system brings out the difference in Bi element adsorption between the two processes and results in only 30% adsorption against total incident Bi amount by layer-by-layer deposition, in contrast to enough Bi adsorption by co-deposition.