• 폴리머
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• 제29권6호
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• pp.588-592
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• 2005

자외선을 차단할 목적으로, 단일 모재를 사용함으로써 기존 방법이 갖고 있는 차단제의 적층에 따른 두께 증가와 접착제의 반응 온도에 따른 변형 등의 단점을 개선하고자 하였다. 화장품 용기 및 옥외용으로 사용 가능한 고분자 필름(폴리카보네이트) 표면에 이온 조사를 통하여 고분자 표면을 개질하였다. 표면 개질된 필름의 280$\∼$400 nm 사이 자외선 차단 특성, 표면의 화학 및 형태 변화 특성, 자외선에 대한 저항성을 W분광기, FTIR(ATR)과AFM, UV 촉진 내광성 시험기를 이용하여 측정하였다. 분석 결과, 개질된 고분자 필름은 자외선 전 영역을 차단할 수 있었고 이온의 주입량에 따라 차단율을 자유롭게 변화시킬 수 있었다. 이는 이온들의 주입으로 인한 고분자의 표면 화학 변화에 기인한다. 개질된 고분자 표면은 nm수준으로, 별도의 차단제가 필요없는 하나의 모재로, 자외선 차단을 위해 활용 할 수 있으리라 판단된다. 또한 자외선 조사에 따른 고분자의 색 변화 및 자외선 투과 특성 변화가 없음을 확인하여 일상 생활환경에서 지속적인 자외선 차단 방법으로 사용 가능하리라 기대할 수 있었다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2010년도 춘계학술발표대회
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• pp.6.2-6.2
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• 2010

Stainless steel is widely known to have superior corrosion properties. However, in some harsh conditions it still suffers various kinds of corrosions such as galvanic corrosion, pitting corrosion, intergranular corrosion, chloride stress corrosion cracking, and etc. For the corrosion protection of stainless steel, the ceramic coatings such as protective silica film can be used. The sol-gel coating technique for the silica film has been extensively studied especially because of the cost effectiveness. It has been proved that silica can improve the oxidation and the acidic corrosion resistance of metal surface in a wide range of temperatures due to its high heat and chemical resistance. However, in the sol-gel coating process there used to engage a heat treatment at an elevated temperature like $500^{\circ}C{\sim}600^{\circ}C$ where cracks in the silica film would be formed because of the thermal expansion mismatch with the metal. The cracks and pores of the film would deteriorate the corrosion resistance. When the heat treatment temperature is reduced while keeping the adhesion and the density of the film, it could possibly give the enhanced corrosion resistance. In this respect, inorganic protective silica film was tried on the surface of stainless steel using a sol-gel chemical route where silica nanoparticles, tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) were used. Silica nanoparticles with different sizes were mixed and then the film was deposited on the stainless steel substrate. It was intended by mixing the small and the large particles at the same time a sufficient consolidation of the film is possible because of the high surface activity of the small nanoparticles and a modest silica film is obtained with a low temperature heat treatment at as low as $200^{\circ}C$. The prepared film showed enhanced adhesion when compared with a silica film without nanoparticle addition. The films also showed improved protect ability against corrosion.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1276-1279
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• 2005

The long-term stability of pentacene thin-film transistors (TFTs) encapsulated with a transparent $SnO_2$ thin-film prepared by ion beam assisted deposition (IBAD) was investigated. With a buffer layer of thermally evaporated 100 nm $SnO_2$ film deposited prior to IBAD process, our encapsulated OTFTs sustained its initial field-effect mobility up to one month and then gradually degraded showing only 37% reduction compared to 90% reduction of non-encapsulated OTFTs after 100 days in air ambient. The encapsulated OTFTs also exhibited superior on/off current ratio of over $10^5$ to that of the unprotected devices $({\sim}10^4)$ which was reduced from ${\sim}10^6$ before aging. Therefore, the enhanced long-term stability of our encapsulated OTFTs should be attributed to well protection of permeation of $H_2O$ and $O_2$ into the devices by the IBAD $SnO_2$ thin-film which could be used as an effective inorganic gas barrier for transparent organic electronic devices.

• Korean Chemical Engineering Research
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• 제52권2호
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• pp.256-260
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• 2014

건축물 내부의 장식을 위해 사용되는 MDF합판은 화염의 착화를 지연시키기 위해 방염처리하도록 규정하고 있어 일반적으로 방염도료나 방염액 또는 방염필름 등을 적용하여 착화를 지연시키는데 이 때 적용하는 시료에 따라 방염성능과 연소 시 발생되는 가스의 유독성의 차이가 발생할 수 있어 본 연구에서는 MDF에 적용된 방염시료들의 방염성능 및 연소특성에 대해 비교분석하였으며 그 결과 방염성능에 부합하는 제품이 확인되었으나 방염처리방법에 따라 방염성능의 차이가 존재함을 확인할 수 있었으며 연소과정에서 발생되어지는 여러 종류의 유독가스의 영향도 함께 고려해야 할 요소임을 확인할 수 있었다.

• 한국화재소방학회논문지
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• 제25권3호
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• pp.107-112
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• 2011

본 연구에서는 대전방지필름 제조공장에서의 화재위험성 등을 고찰하였다. 대전방지필름 제조공정에서는 에탄올, 메탄올, 이소프로필알콜 같은 인화점이 낮은 용제가 사용되며 이들 용제의 최소점화에너지는 0.16 mJ~0.65 mJ로 낮은 방전에너지에도 쉽게 착화할 위험성이 있다. 제조공정 각 부분에서 발생하는 정전기 전위를 측정한 결과, 합지 과정의 필름에서 17kV~20kV의 전위가 측정되었다. 이는 화재 폭발 방지를 위한 부도체의 대전 목표 값인 5kV를 초과하는 것이다. 따라서 대전방지필름 제조공장에서 정전기 방전에 의한 화재위험성이 높다는 것을 알 수 있었다.

• 설비공학논문집
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• 제23권3호
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• pp.188-193
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• 2011

For a long time work or study, pendent task lighting system prepared with phosphor luminescent film LED was developed for eye protection and working efficiency improvement. Developed lighting system was used together with pendent and ambient lighting. Such as, we made comfortable lighting environment system. Evaluation for developed lighting system, that had proceeded to Mock-up test and subjective evaluation. Also It had proceeded that lighting environment analyzed and compatibility valuation of installation. In subjective evaluation, the students have expressed themselves satisfied to phosphor luminescent film LED lighting system. In Mock-up test, It is not problem to intensity of illumination, luminance and color temperature. Therefore, developed LED lighting system was installed at the Daegu apartment. It is having a P.O.E study progress to phosphor luminescent film LED lighting system.

• 한국의류학회지
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• 제25권4호
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• pp.707-718
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• 2001

The purpose of this study is to evaluate a newly developed protective suit with the fragments of grenade. The protection efficiency should be strengthened upon the degree of wound. The fragment weight of the used grenade was measured and the kinetic energy of the maximum speed of the fragments in the field test was 137.7J and this could be the protective efficiency test by the multitude fragments in less than 0.031g of the M16A1. The panel inserted to the new demining suit has protection rate of 100% within the distance of 1m and sample II has protection rate of 100% only beyond the distance of 5m. The test showed that the protection rate on the protective suit of the existing garment was comparatively high, however, the protection rate of the sleeve part was very low. The new demining suit through the research demand some complementary measures to lower the temperatures in ear, average skin temperatures, and the temperatures-humidity inside the clothing for summer climate condition, It showed that 30 minutes of rest on the clothing was difficult to go back to the original condition. But in winter climate condition, there was no problem in the temperature, humidity, and comfort to go back to the original condition during the rest and was better in warmth.

• 한국정보전자통신기술학회논문지
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• 제12권2호
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• pp.150-154
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• 2019

In the design of semiconductor integrated circuits, ESD is one of the important issues related to product quality improvement and reliability. In particular, as the process progresses and the thickness of the gate oxide film decreases, ESD is recognized as an important problem of integrated circuit design. Many ESD protection circuits have been studied to solve such ESD problems. In addition, the proposed device can modify the existing SCR structure without adding external circuit to effectively protect the gate oxide of the internal circuit by low trigger voltage, and prevent the undesired latch-up phenomenon in the steady state with high holding voltage. In this paper, SCR-based novel ESD(Electro-Static Discharge) device with the high holding voltage has been proposed. The proposed device has the lower triggering voltage without an external trigger circuitry and the high holding voltage to prevent latch-up phenomenon during the normal condition. Using TCAD simulation results, not only the design factors that influence the holding voltage, but also comparison of conventional ESD protection device(ggNMOS, SCR), are explained. The proposed device was fabricated using 0.35um BCD process and was measured electrical characteristic and robustness. In the result, the proposed device has triggering voltage of 13.1V and holding voltage of 11.4V and HBM 5kV, MM 250V ESD robustness.

• Corrosion Science and Technology
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• 제5권3호
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• pp.112-116
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• 2006

This study has been conducted to monitor the corrosion rate of cathodically protected structure and corrosion inhibited system using multi-line thin-film electrical resistance (TFER) sensor in various environments. The field test data of TFER sensor for the corrosion monitoring of cathodically protected underground pipeline in soil environments and of corrosion inhibited gas heaters were also presented. The sensor was found to be a powerful method to commit the sensitive pick-up of small corrosion rate which can be observed in the cathodically protected and corrosion inhibited systems.

• 대한방사선방어학회:학술대회논문집
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• 대한방사선방어학회 2011년도 추계 학술발표회 및 심포지엄
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• pp.246-247
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• 2011