• Proceedings of the International Microelectronics And Packaging Society Conference
• /
• 2007.04a
• /
• pp.101-113
• /
• 2007

• Proceedings of the International Microelectronics And Packaging Society Conference
• /
• 2002.09a
• /
• pp.97-120
• /
• 2002

• Proceedings of the Korea Society of Design Studies Conference
• /
• 2005.05a
• /
• pp.28-29
• /
• 2005

• The monthly packaging world
• /
• s.374
• /
• pp.36-43
• /
• 2024

• Hwankyungkyoyuk
• /
• v.24 no.4
• /
• pp.51-61
• /
• 2011

In this study, the Korean alternative school teachers' perceptions of ecocentric environmental education were surveyed. A total of 80 teachers from 42 alternative schools across the nation answered to the survey. The results were as follows. Teachers were found to have a lot of interest in environmental issues and to practice some environmental actions inside and outside school. Over sixty percent teachers agreed with the ecocentric philosophy of environmental education. The most two important issues among 11 environmental education contents for teachers were "natural environment" and "environmental ethics". Teachers used and preferred "field work" for teaching environmental issues, and got teaching materials mostly from the internet. However, many of them were not satisfied with environmental activity in their schools because of their lack of professionalism. They had not enough experience of professional development for environmental education, and strongly wanted to learn about field work.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.18 no.1
• /
• pp.23-30
• /
• 2010

Trends of the automotive market require the application of new engine technologies, which allows for the use of different types of fuel. Since ethanol is a renewable source of energy and it contributes to lower $CO_2$ emissions, ethanol produced from biomass is expected to increase in use as an alternative fuel. It is recognized that for spark ignition (SI) engines ethanol has advantages of high octane number and high combustion speed. In spite of the advantages of ethanol, fuel supply system might be affected by fuel blends with ethanol like a wear and corrosion of electric fuel pumps. So the on-board hydrogen production out of ethanol reforming can be considered as an alternative plan. This paper investigates the influence of ethanol fuel on SI engine performance, thermal efficiency and emissions. The results obtained from experiments have shown that specific fuel consumption has increased by increasing ethanol amount in the blend whereas decreased by the use of hydrogen-enriched gas. The combustion characteristics with hydrogen-enriched gaseous fuel from ethanol reforming are also examined.

• Journal of Food Hygiene and Safety
• /
• v.12 no.2
• /
• pp.132-140
• /
• 1997

Additives in plastics are capable of migrating from the packaging materials into the foodstuffs, thereby presenting a source of contamination and a potential health risk to the consumer. The migration from packaging materials into foodstuffs is first of all regulated by examining the amounts of global and specific migrated components. Besides, there is worldwide still a need for practical methods for measuring and monitoring migration from polymers, especially for the testing of migration into fatty foodstuffs. Therefore, these studies were undertaken to investigate the safety status of domestic plastic packaging materials with respect to migration. Another objective of this study was to examine the applicability of ethanol as an alternative fatty food simulant substituting for olive oil and n-heptane. The evaporation residues for various dometic plastic samples determined as described in Korean food laws were in the level from 4.3 to 14.5 mg/$\ell$, which were much lower than the limit value of 150 mg/$\ell$. The global migration values into 95 % ethanol showed to be comparable to those into n-heptane, while the olive oil migration values were comparably higher than those into ethanol or n-heptane and moreover they were not reproducible. The kinetic migration begavior of additives in polyolefin samples into 95% ethanol showed a Fickian diffusion process. The results of these studies on global migration and kinetic testings demonstrate that the ethanol could be successfully substitute for the olive oil and n-heptane as an alternative fatty food simulant, at least in contact with polyoefins.

• Journal of the Korean Ceramic Society
• /
• v.42 no.12 s.283
• /
• pp.808-815
• /
• 2005

[ $Bi_xCe_{l-x}O_{2-x/2}$ ](BD C : Bismuth Doped Ceria) powders with x = 0.1, 0.2, and 0.3 were synthesized using the Glycine Nitrate Process (GNP). They were then calcined at $500^{\circ}C$ for 2 hand sintered in a pellet or rod form at 900, 1000 or $1100^{\circ}C$ for 4 h for characterization as the alternative electrolyte material for intermediate temperature solid oxide fuel cells. The BDC powder consisted of a single phase of $CeO_2-Bi_2O_3$ solid solution in the as-synthesized state as well as in the as-calcined state with a mean powder size of 4.5nm in the former state and 6.5 - 10.1nm in the latter. On the contrary, the second phase of $\alpha-Bi_2O_3$ was observed to have been formed in the sinter with its amount increasing roughly with increasing temperature or $Bi_2O_3$ content. The BOC powder was superior in sinterability to other alternative electrolyte materials such as GDC, ScSZ, and LSGM with the minimum sintering temperature for a relative density of $95\%$ or larger as low as $1100^{\circ}C$. The ionic conductivity of BOC increased with $Bi_2O_3$ content and the maximum value of 0.119 S/cm was obtained at $800^{\circ}C$ for $Bi_{0.3}Ce_{0.7}O_{1.85}$.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2008.10a
• /
• pp.1065-1066
• /
• 2008

Printed thin-film transistors (TFTs) have received profound interests as an alternative to their silicon counterparts for use in fabricating next-Gen microelectronics by virtue of projected low manufacturing cost and certain salient features (e.g., thin and lightweight characteristics, structural flexibility, etc.) that printed TFTs bring to device architecture. The economic advantages stem from engaging low-cost printing techniques (e.g., screen printing, gravure, flexography, etc.) for deposition and patterning in place of traditionally costly high-vacuum, high-temperature photolithographic processes. To render printing TFTs possible, solution processable materials are necessary.

• Journal of Industrial Convergence
• /
• v.20 no.10
• /
• pp.219-224
• /
• 2022

This study is to propose a alternative gem that is expressed in various ways instead of jewelry with limited output. It was investigated what materials were used in the alternative gem used in the jewelry design thesis over the past five years. In addition, as a result of a survey to understand the needs of customers, it was found that customers also use resin among resins as an alternative gem, like as research trends. Based on this, the scope of resin use as a alternative gem was expanded and applied to jewelry design rather than the existing method of using resin. As a result, it was found out a various uses of resin as an alternative gem. However, the demand and traditionality that correspond to the conditions of jewelry remain challenges to be established through various jewelry design studies in the future. Therefore, in order to utilize the popular preference of alternative gem, continuous research on applying jewelry design to alternative gem should be continued.