• KOREAN JOURNAL OF CROP SCIENCE
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• v.39 no.6
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• pp.577-584
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• 1994

A field trial was carried out to select suitable crops for diverted upland from paddy field and to investigate response of several forage crops to soil properties and ground water levels of the diverted upland at Suwon area of Korea in 1992 and 1993. Experiments were conducted in sandy loam plot and comparatively clay loam plot having higher ground water level. Rye (Paldang), triticale (Shinki), italian ryegrass (Tetraflorum) were used as wintering forage crops and maize(Suwon 19), sorghum-sudangrass hybrid(Pioneer855F), pearl millet(Suwon 6), japanese millet (King) were used as summer forage crops. Growth and yield of forage crops were better and higher in sandy loam soil having low ground water level. Among wintering forage crops, triticale recorded the highest forage yield. Rye showed high forage yield in sandy loam soil and italian ryegrass hardly survived in diverted upland of Suwon area during winter. Among summer forage crops, forage yield of sorghum-sudangrass hybrid was highest. Yield of japanese millet was not affected by soil conditions in both plots. Yields of pearl millet and maize remained relatively low in both plots.

• International Journal of Highway Engineering
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• v.6 no.4 s.22
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• pp.91-100
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• 2004

This study was Performed to evaluate applicability of color flexible pavement concrete (CFPC) for motorway pavement. Color flexible pavement has been applied to non-motorway pavements, such as pedestrian and bicycle road. Two polymers were used to modify the binder and to strengthen the stiffness of pavement mixture. Waste paper was used to prevent the asphalt of gap-grade mixture from draining. Marshall properties, indirect tensile strength(ITS), tensile strength ratio(TSR) before and after freezing-and-thawing treatment and artificial aging, permanent deformation and fatigue life were measured. Color bituminous concrete mixtures used this study had nearly the same quality in mechanical properties when compared with conventional asphalt concrete mixtures manufactured with AP-3 and all mixtures satisfied with domestic specification for motorway pavement. Therefore, it is proved that the color bituminous concrete used this study can be applied for motorway pavement.

• Journal of the Korean GEO-environmental Society
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• v.16 no.11
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• pp.13-19
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• 2015

Construction materials using soil which is the most common material around us have many advantages, but their long-term durability and sensation of walking as pavements have problems. Therefore, they are used after compaction or mixed with various hardening agents such as lime and cement for strength enhancement. However, studies on the behavior of pavement materials mixed with environment-friendly hardening agents or admixtures to improve walking property are still insufficient. In this study, therefore, in order to evaluate the appropriate mixing ratio and field application characteristics of pavement materials using mixed soils with environment-friendly hardening agents and natural materials such as wood chips, mechanical tests were performed to evaluate the rational mixing ratios and the ball test was performed as an elasticity test to evaluate the field applicability. The results suggest that the content of wood chips should be selected at 1.5% or lower according to the purpose of the structure, and the hardening agent at 10~15%. The evaluation results for GB/SB coefficient ratio which indicates the walking property show that the appropriate mixing ratio of the hardening agent in terms of the sensation of walking is 15% of lower, but different mixing ratios should be chosen according to the proportion of wood chips.

• The Journal of Information Technology and Database
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• v.3 no.2
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• pp.39-51
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• 1996

CORBA는 분산 시스템의 객체를 관리하기 위한 모형으로 여러 응용에서 장점을 보인다. 그러나 CORBA 객체의 정의에는 지속성을 가정하고 있지 않다. 본 논문에서는 CORBA의 BOA(Basic Object Adapter)에 객체 데이타베이스 어댑터(Object Database Adapter, ODA)를 구현하여 객체를 관계 데이타베이스에 저장함으로써 객체의 지속성을 유지하도록 하였다. 객체의 관리는 객체지향 데이타베이스 시스템이 자연스러우나 본 논문에서는 이미 구축된 관계 데이타베이스 시스템과 응용을 공유할 수 있도록 관계 데이타베이스용을 구현하였다. ORB는 Orbix를 사용하였고, 튜플의 객체로의 대응은 Tie 법과 객체포장기 개념을 사용하였다. CORBA 응용의 관점에서 데이타베이스 시스템을 이용한 객체의 지속성 유지는 지속성 유지와 더불어 많은 수의 객체를 효율적으로 관리할 수 있고, 병행성, 회복기법 등을 이용할 수 있는 여러 장점이 있다. 또 데이타베이스 시스템 측면에서 CORBA와 데이타베이스 어댑터의 이용은 사용자에게 데이타베이스 스키마에 관한 사항을 숨김으로써 데이타베이스 접근을 쉽게 하고, 분산된 데이타베이스 환경에서는 데이타베이스 모델과 언어의 이질성을 해소할 수 있는 장점이 있다.

• 프린팅코리아
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• v.8 no.6
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• pp.52-57
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• 2009

디지털인쇄기의 발전이 속도를 내면서 갈수록 그 영역을 넓히고 있다. 최근 열렸던 '2009 중국인쇄박람회'에서 선보인 H사의 하 모델은 기존의 편평한 종이뿐만 아니라 종이박스 등 소재에 관계없이 분당 수십m 길이의 인쇄물을 일정한 속도로 찍어낸 관심을 끌기도 했다. 이미 최근 수년간 인쇄산업에서 주목을 받아온 '디지털 인쇄기'는 서적이나 카탈로그 등 제한적으로 인쇄물만을 찍는다는 고정관념을 무너뜨리는데 앞장서며 출판뿐 아니라 제품의 포장지나 라벨, 간판, 매뉴얼 등의 새로운 영역을 인쇄에 포함시키고 있다. 관련업계에서는 디지털인쇄시장이 세계 산업용 인쇄시장 규모의 10%에 달하는 7000억 달러 정도를 차지할 것으로 전망하고 있기도 하다. 이에 따라 새로운 영역으로 꼽히는 산업용 인쇄시장은 높은 성장률을 보이는 가운데 연일 디지털인쇄기에 신규 수요가 쏟아지고 있다. 침체되어 있다는 국내 인쇄업계에서도 디지털인쇄 부문이 차지하는 비중은 계속 높아지고 있으며 새로운 수익원을 창출할 것으로 기대를 받고 있다. 그러나 완벽한 것은 없는 것이 세상의 이치이듯 디지털인쇄기를 사용하는 인쇄업체들이 점차 늘어나면서 막연하던 인식이 구체화 되는가 하면, 기능과 사용영역에 대해 새롭게 인식되는 경우도 늘고 있다. 최근 디지털인쇄기 시장의 현황과 사용업체들이 갖고 있는 디지털인쇄기의 사용 이전과 이후에 달라진 인식에 대해 알아본다.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.8 no.2
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• pp.49-59
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• 2002

The main function of plastic materials in food packaging is to preserve a food for safe transportation and storage. The interactions between food and plastic materials in food packaging have become increasingly important for food quality and safety because monomer, low molecular weight components, or additives of plastic packaging materials can migrate into a food. The use of antioxidants in plastic materials can help protect the degradation of film itself and retard the oxidation of a packaged food containing lipid, through the migration of antioxidant from the packaging to a product via an evaporation / sorption mechanism. Nowadays, antioxidant (BHT) impregnated plastic materials are used for commercial food packaging application with the intention of achieving an extended shelf life of food in USA. Alpha tocopherol, as one of the most important free radical scavengers, has been well known in biological systems. Moreover, the potential use of alpha tocopherol as an additive for polymers used in the packaging industry may offer the most positive perception from both consumers and manufacturers. Alpha tocopherol has been used as an antioxidant for polyolefin resins fabricated to both bottles and film and has applications in the food packaging industry as a replacement for BHT. Today, alpha tocopherol offers an attractive choice for use as an antioxidant in polymers. This paper provides an overview of antioxidant effectiveness and applications for its use by the food packaging industry based on the evaporation-sorption mechanism of a packaging model product, where quality is associated with lipid oxidation. Important analytical techniques for predicting antioxidant interaction between the package system and product are discussed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.1
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• pp.717-724
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• 2020

In general, the factors affecting the heat transfer of asphalt pavement are divided into weather factors and pavement materials. Among them, material factors include the thermophysical and surface properties. An experiment was conducted on the thermal-physical factors of asphalt, which are the basis for the pavement failure model. The thermal conductivity, specific heat capacity, thermal diffusivity, and thermal emissivity were evaluated as the thermo-physical properties of asphalt. The specimens (WC-2 & PA-13) used in the experiment were compacted with a Gyratory Compactor. The experimental results of WC-2 and PA-13 showed a thermal conductivity of 1.18W/m·K and 0.9W/m·K, specific heat capacity of 970.8J/kg·K and 960.1J/kg·K, thermal emissivity of 0.9 and 0.91, and thermal diffusivity of 5.15㎡/s and 4.66㎡/s, respectively. Experiments on the heat transfer characteristics (thermo-physical properties) of asphalt pavement that can be used for thermal failure modeling of asphalt were conducted.

• International Journal of Highway Engineering
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• v.10 no.4
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• pp.91-101
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• 2008

A multi layered elastic analysis program, IDYSPAP, was developed. The objective of this study was to develop the IDYSPAP program on Graphic User Interface environment for field engineers using Visual Basic, which was considered span of multi-wheels and maximum 4 axles using superposition of linear elastic theorem. It is suggested that this study considers algorithm with dynamic properties of asphalt layer on various temperature and non-linear properties of subbase and subgrade on stress non-linearity for asphalt pavement structure. This Program was modified to divide asphalt layer automatically according to layer division concept. The developed program was verified with initial measuring data in test road sections of KEC (Korea Expressway Co.) using laboratory test results.

• Journal of Food Hygiene and Safety
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• v.33 no.4
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• pp.229-239
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• 2018

Currently, in Korea, a dry food simulant has not been designated for the migration testing of paper and board, food contact materials (FCMs) being used in dry foods, and foods heated at ultra-high temperature. Considering the diverse usage of FCMs, in order to secure reliable and confident safety evaluation and to overcome the non-trade barrier tariff in worldwide trade, migration testing methods of what should be more clearly defined for securing and overcoming. This article delves into the available literature on the use of $Tenax^{(R)}$ as a simulant for dry foods as well as its suitability and limitations, and examines the feasibility of its introduction into Korean FCMs regulation. Most experimental studies using $Tenax^{(R)}$ showed overestimated migration values when used in real foods, which reflects the potential of $Tenax^{(R)}$ as a dry food simulant in a worst-case scenario. However, more studies are required to optimize migration testing using $Tenax^{(R)}$ by standardizing the solvent type and the extraction method for surrogates of various FCMs and foods, and to resolve the potential drawbacks in the use of $Tenax^{(R)}$.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.26 no.1
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• pp.33-39
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• 2020

The objective of this study was to evaluate the possibility for the coffee filter paper of Hanji. In this study, the samples for Hanji filter papers were prepared with three different mulberry fiber contents of 10, 30 and 50%(w/w). Surface brightness and apparent density of hand-made Hanji decreased with increasing mulberry fiber contents. However, values of thickness, tensile strength, wet tensile strength, burst strength, and folding endurance for hand-made Hanji increased by increasing the contents of mulberry fibers due to fiber-to-fiber bonding. The results of the coffee extraction test using the developed filter papers showed no significant differences between commercial filter paper and Hanji filter paper. Therefore, Hanji filter paper containing more than 30%(w/w) mulberry fiber may have potential uses for the dripped coffee filter application from a physical property point of view.