• 펄프종이기술
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• 제47권5호
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• pp.15-22
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• 2015

The crop production technologies keep in improving and the cultivation becomes more standardization owing to the significant developments of various agricultural materials. The artificial soil and base system for root could be one of the major technologies for the modern cultivation especially for controlled horticulture. Although the perlite, cocopeat, and peat moss are the major components of the artificial soil and are broadly used for various application, there is a great need for the new alternative materials for overcoming the low nutrition and the possible shortage of raw materials. In this study, the application of oil palm EFB fiber as an alternative materials for artificial soil especially for the seeding pad components was evaluated. The changes in the structural properties and the functional properties such as moisture holding properties were compared by laboratory produced seeding pads with different mixture of oil palm EFB fiber. The addition of fibrillated EFB fiber resulted in the significant increase in durability of the seeding pad, which showed the possible application of EFB fiber to the seeding pad instead of the wood fiber (UBKP). The moisture holding properties and the germination condition characteristics of the EFB fiber showed the slight less than those of the cocopeat, which require more sophisticated study for improving the functional properties of seeding pad made of the EFB fiber.

• 한국해양공학회지
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• 제23권2호
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• pp.92-97
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• 2009

In order to export aircraft components or substructures, it is necessary to get a certification from the main company for the components or an airworthiness certification from the FAA. In Korea, those processes are performed by a small number of private companies for aircraft components. However, airworthiness certification has never been done in the company. To export an assembled aircraft, whether small or large, it is obligatory to get a certification for the aircraft being exported. Currently, the Korean government is trying to get BASA agreement in a few years. For a mid-size company, it is easier to get the NADCAP audit process for the supply of aircraft components to the main company. In this paper, the overall process of aircraft certification is discussed and airworthiness certification is treated for export aircraft. Moreover, the NADCAP audit process is described in detail by introducing example parts made of composite material. This detailed process would be very helpful to a small or mid-size company that wants to develop and deliver aircraft components to foreign companies.

• 분석과학
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• 제28권3호
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• pp.160-167
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• 2015

이 연구에서는 화장품 중 사용한도 성분으로 지정되어 있으나 아직 분석방법이 개발되지 않은 살균 보존 성분으로 사용되는 zinc pyrithione (ZnPT)에 대한 분석방법을 개발 확립하기 위한 목적으로 국 내외 자료 및 문헌을 조사하여 분석방법을 설정하였으며, 분석방법의 유효성 확인에 필요한 base matrix 시료의 선정을 위해 대상성분들의 사용량 및 사용제품들에 대한 자료를 조사하였다. Base matrix 시료를 선정·제조한 후 분석방법 유효성 확인 절차에 따라 각 대상성분들에 대한 분석방법의 유효성을 확인하였으며 실험실간 분석방법의 유효성 확인 수행을 통해 개발된 분석방법을 검증하여 확립하였다. 최종적으로 실제 시중 유통 화장품을 대상으로 개발된 분석방법을 적용하여 분석방법의 적합성을 검증하였다. 이 연구를 통해 개발된 분석방법을 '화장품 중 배합한도 성분 분석법 가이드라인'으로 제시함으로서 국내 시장 유통화장품의 검정에 활용되어 품질의 향상 및 국민 보건 안전성이 증진될 것이며 국내 화장품 산업의 국제 경쟁력 강화로 인해 수출 증대에 기여할 것으로 기대된다.

• KIEAE Journal
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• 제10권5호
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• pp.123-129
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• 2010

This study aimed at analyzing the trend of carbon dioxide emission for direct and indirect areas by using inter industry relations table between 2000, 2003 and 2005 in the key building materials and components. Results of this study are as follows; First, the material and components for this study was selected in 20 industries of products such as sand, gravel, cement, concrete articles, rebar, and steel bar. Second, among the 20 selected key building materials, the group with the highest carbon-dioxide emission was shown in ready-mixed concrete, concrete articles, and primary aluminum goods. Third, as a result of analyzing the changes to the units of carbon dioxide emission according to passage of time, the number of items which is changed in such as sustained increase or decrease over time was insignificant in carbon-emission change trend.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.365-368
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• 2004

We present a family of elaborate numerical models for simulation and systematic optimization of complex LCDs for demanding applications (e.g. LCD-TV). These numerical models comprise modules for solving LCD-related problems in one, two and three dimensions. The three modules feature an intuitive graphical user surface for a jump-start into modeling, a common database for a range of materials and components as well as sophisticated and proven algorithms with more than 15 years of reliable performance in the LCD-industry. Methods for obtaining data required for the modeling of key components are presented.

• 한국산업융합학회 논문집
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• 제10권1호
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• pp.47-54
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• 2007

Bridge decks are one of the main structural components that are most suitable for utilizing the advantages of FRP materials due to the high strength weight ratio of FRP materials. Design codes for the design of FRP bridge decks should be established to apply FRP materials for bridge decks effectively. At present, design codes are relatively well established for the use of FRP materials as reinforcements in concrete structures. However, design codes have not yet been provided for the structures made of FRP as a main construction material. In this study, for the purpose of preparing design code provisions, reliability analyses were performed to evaluate target level of safety and serviceability on GFRP decks. Based on the results, several guidelines for the development of design codes are suggested.

• 펄프종이기술
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• 제42권3호
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• pp.14-21
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• 2010

Three different species of cattails (Typha orientalis, Typha angustata, Typha latifolia) cultivated in South Korea were examined as raw materials for the production of pulp and paper. Soda pulping with anthraquinone was used for the stems and the leaves of cattail, separately. Addition of anthraquinone in soda pulping improved the yield greatly. Chemical components between three cattail species and within each species (leaves and stem) gave little differences. Average fiber length of the bleached cattail fibers was a little shorter than that of the HwBKP of Eucalyptus. Average fiber width of the cattail fibers was a half of that of the HwBKP. Compared to the HwBKP, cattail pulp gave higher breaking length, higher opacity, and better smoothness at equivalent freeness.

• Elastomers and Composites
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• 제47권3호
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• pp.194-200
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• 2012

고무재료는 배합조건에 따라 기계적 거동이 다르기 때문에 피로수명평가를 위해 부품소재에 대한 물성데이터 확보가 선행되어야 한다. 그러나 모든 종류의 배합조건을 고려하여 표준화된 재료물성을 확보하는 것은 현실적으로 불가능하다. 따라서 본 연구에서는 최소한의 제한된 실험으로부터 피로수명평가를 위한 입력물성을 선택하기 위한 방법을 제시하였으며, 피로수명 평가를 위한 최적 피로손상 파라미터를 결정하였다. 이러한 결과를 활용하여 부품의 피로수명 평가결과와 내구시험결과를 비교한 후, 본 연구에서 제안된 피로수명 평가절차의 타당성을 검토하였다.

• 열처리공학회지
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• 제31권6호
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• pp.275-282
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• 2018

Two different modes of rolling were applied to control the texture development in tantalum sheet. In the conventional uni-directional rolling, the typical rolling textures of a body-centered cubic metal which was primarily composed of <110>//(rolling direction) was developed. In a cross rolling where the specimen was rotated by $90^{\circ}$ between each pass, the rotated cube components, i.e. {100}<011> were greatly reinforced. The prediction of lattice rotation by the full-constraint Taylor model showed that the high stability and the symmetry of the rotated cube components caused their strengthening in cross-rolling. The two specimens were heated to $1,100^{\circ}C$ at $9^{\circ}C/min$and held for 1 hour for annealing, then cooled to room temperature in atmosphere. In spite of the significant difference in the deformation textures, the annealing textures were very similar. They developed strong <111>//(plane normal) components with negligible intensity at the rotated cube components, which was attributed to the negligible capability of the latter components to provide effective recrystallized grains.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1987년도 제6회 학술강연회초록집
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• pp.28-38
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• 1987

The effective use of rolling oils in the metalworking industry is generally regarded as an art rather than a science. With variations in the quality of some of the raw materials used e.g. vegetable oils, it was often difficult to predict the performance of a product from one batch to another. However, with the increasing use of synthetically produced components and better understanding of the rolling process itself, more consistent and predictable results can now be obtained.