• Journal of Climate Change Research
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• v.9 no.1
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• pp.69-74
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• 2018

The purpose of this study is to suggest the methodology of $CO_2$ Emission Factor Verification and Quantitative Assessment in Ethylene Product Processes. At first, this study compare the IPCC (Intergovernmental Panel on Climate Change) 1996 Guideline and 2006 Guideline. And analyse methodology for estimating $CO_2$ emission and $CO_2$ emission factor in Ethylene product process. Also analyse cases of estimating $CO_2$ emission factor based on material balance. Methodology of $CO_2$ Emission Factor Verification and Quantitative Assessment are following the categories proposed by GIR (Greenhouse Gas Inventory and Research Center). There are total 12 factors in 8 categories and give 5 or 10 points according to their importance. Also this study suggests necessary data of document to meet the conditions. The result would help estimate accuracy Greenhouse Gas Inventory. Also contribute to establish policy on environmental assessment, air conservation, etc.

• Journal of the Korean Wood Science and Technology
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• v.17 no.2
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• pp.13-19
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• 1989

Two different quartz types of gasification reactor were used for pyrolysis and gasification of sawdust, ricestraw, ricehusk and municipal wastes which contain only cellulosics., operating at 1 atmospheric and vacuum pressure respectively. Also a stainless steel autoclave gasification reactor was used which is possible to use up to 100 atmospheric pressures and $800^{\circ}C$ of reaction temperature to complete pyrolysis and gasification reaction. The catalysts used in this reaction w- ere $K_2CO_3$, $Na_2CO_3$, Ni and Ni-$K_2CO_3$ as CO-Catalyst. The product gas mixtures were identified to be CO, $CO_2$, $C_3H_3$, $CH_4$ and $CH_3CHO$ etc. by Gas Chromatography and Mass Spectrometry. The pressurized gasification reaction shows significant increase in terms of methane composition and yield of product gases, comparing with those from unpressurized gasification reactions. The total volume of product gas mixtures amounts to 1600-1800ml per1gof waste of waste lignocellulosics or municipal waste, and the metane content of the gas mixtures reached to 40%, when $800^{\circ}C$ of reaction temperature and 100 atmospheric pressures with Ni-$K_2CO_3$ as CO-catalyst in the pressurized gasification reaction were used. This results show that the product gas mixtures containing 40% of methane call be used for alternative enegy source.

• Advances in Energy Research
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• v.8 no.4
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• pp.265-273
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• 2022

In this study, a product gas yield and carbon conversion were measured during the coal pyrolysis. The pyrolysis process occurred under two different atmospheres such as subcritical (45 bar, 10℃) and supercritical CO₂ condition (80 bar, 35℃). Under the same pressure (80 bar), the atmosphere temperature increased from 35℃ to 45℃ to further examine temperature effect on the pyrolysis at supercritical CO₂ condition. For all three cases, a power input supplied to heating wire placed below coal bed was controlled to make coal bed temperature constant. The phase change of CO₂ atmosphere and subsequent pyrolysis behaviors of coal bed were observed using high-resolution camcorder. The pressure and temperature in the reactor were controlled by a CO₂ pump and heater. Then, the coal bed was heated by wire heater to proceed the pyrolysis under supercritical CO₂ condition.

• Natural Product Sciences
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• v.24 no.3
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• pp.159-163
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• 2018

Two new polyketides, chinoketides A and B (1 - 2) with a known compound xylarphthalide A (3), were isolated from the solid medium of the endophytes from the leaves of the relic plant Distylium chinense with the "black-box" co-culture method, and the structures of two new compounds were elucidated by NMR, MS and CD spectra. And the absolute configurations of chinoketides A (1) and B (2) were determined as 2R,3R,8S and 5R,6S by calculating their ECD spectra to compare with the experimental CD spectra. Finally, the antimicrobial activities were evaluated to Erwinia carotovora sub sp. Carotovora (Jones) Bersey et al, and the results showed that compounds 1 - 3 displayed the antimicrobial activities with MIC value at 20.5, 30.4 and $10.2{\mu}g/mL$.

• Korean Journal of Animal Reproduction
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• v.24 no.4
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• pp.339-341
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• 2000

In mammals, fatty acid utilization is initiated by activation of fatty acid, catalyzed by acyl-CoA synthetase(ACS, EC6.2.1.3). This enzyme reaction is essential in fatty acid metabolism, since mammalian fatty acid synthetase contains a specific thioesterase to produce fatty acid as th $\varepsilon$ final reaction product. Acyl-CoA, the product of ACS, is utilized in various metabolic pathways including membrane biogenesis, energy production and fat deposition. (omitted)

• Communications of the Korean Mathematical Society
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• v.35 no.2
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• pp.359-370
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• 2020

A graph G is called a well covered graph if every maximal independent set in G is maximum, and co-well covered graph if its complement is a well covered graph. We study some properties of a co-well covered graph and we characterize when the join, the corona product, and cartesian product are co-well covered graphs. Also we characterize when powers of trees and cycles are co-well covered graphs. The line graph of a graph which is co-well covered is also studied.

• Journal of Environmental Science International
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• v.9 no.6
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• pp.505-509
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• 2000

The purpose of this study was to evaluate the effects of $Ca(OH)_2$ and $CO_2$ additions on the corrosion of metal coupons(ductile iron, galvanized steel, copper and stainless steel). Corrosion rate and released metal ion concentration of ductile iron and galvanized steel decreased by adjusting alkalinity, calcium hardness and pH with $Ca(OH)_2$ & $CO_2$ additions on copper and stainless steel were less than those on ductile iron and galvanized steel. When ductile iron coupon was exposed to water treated with Ca(OH)$_2$&$CO_2$, additions, the main components of corrosion product formed on its surface were $CaCO_3$ and $Fe_2 O_3 or Fe_2 O_4$ which often reduce the corrosion rate by prohibiting oxygen transport to the metal surface.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2496-2498
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• 2001

광 디스크 channel상에서 RSPC의 error correction capability를 확률적인 계산 방법으로 계산하는 데는 많은 어려움이 있다. 그 이유는 바로 광 디스크 channel이 burst error channel이기 때문인데, 이 burst error를 어떻게 다루는 가에 따라 그 error correction capability는 사뭇 달라진다. 이 논문에서는 Sony의 dust error distribution[1] 아래에서 4-state Morkov Chain[2]로 modeling하고 그 결과를 가지고 burst error를 channel의 특성과 ECC format의 특성에 맞게 제어할 수 있는 확률적인 계산방법을 소개하고 그것을 simulation하고자 한다.

• Journal of Distribution Science
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• v.13 no.12
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• pp.105-111
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• 2015

Purpose - Many global companies across industries are paying significant attention to co-creation activities, which enable consumers to participate in firms' value creation process, as a main model of new product development processes. In this study, we aim to examine different types of co-creation activities and their effects on consumer attitudes. We focus on upstream co-creation, downstream co-creation, autonomous co-creation, and sponsored co-creation. Upstream co-creation includes firms' control and management in the initial stage of new product development and prototype testing. Downstream co-creation indicates that consumers participate in firms-initiative activities at a later stage in new product development, such as public relations and marketing communications. Autonomous co-creation includes consumers' commitment activities in the absence of firms' rewards. However, under the sponsored co-creation, consumers can return monetary and social rewards from firms through their co-creation activities. The hypotheses regarding the effect of co-creation on consumer attitudes are as follows. (H1, H2, H3, H4) Upstream, downward, autonomous, and sponsored co-creation has positive effects on consumer attitude. (H5, H6) As intrinsic motivation increases, the positive effect of upstream and autonomous co-creation increases. (H7, H8) As extrinsic motivation increases, the positive effect of downward and sponsored co-creation increases. Research design, data, and methodology - To achieve our research goals, we analyzed responses from 246 samples from Korean consumers and verified the proposed hypotheses using a linear regression model. The samples include Korean consumers who experienced upstream, downstream, autonomous, and sponsored co-creation by firms. Results - First, both upstream co-creation and downstream co-creation with firms and consumers are found to have positive effects on consumer attitudes. Second, autonomous co-creation and sponsored co-creation are found to positively affect consumer attitudes. Third, consumers' intrinsic motivation has a fit-effect between upstream co-creation and autonomous co-creation, and their extrinsic motivation has a fit-effect between downstream co-creation and sponsored co-creation. Consumers who have strong intrinsic motivation are affected by upstream co-creation and autonomous co-creation. However, consumers who have strong extrinsic motivation are affected by downstream co-creation and sponsored co-creation. Conclusion - These results indicate that the fit between consumers' co-creation participation types and consumers'motivations is a significant factor in determining consumer attitudes. The results of this study imply that various types of consumer participation actually improve consumers' attitudes toward products and brands. In addition, our study also suggests that firms should consider the fit between co-creation types and consumers' motivations when they initiate co-creation activities. In this study, we survey consumers who participated in firms' co-creation activities. Future studies can compare different types of consumers. For instance, we can examine the different in different test by comparing experienced versus inexperienced consumers. Finally, we expand this research to user-generated content topics. This attending issue focuses on the mechanism that breaks down the boundaries and barriers between consumers and producers.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.11a
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• pp.163-163
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• 2009

Viewing angle controllable liquid crystal display (LCD) associated with fringe-field switching (FFS) mode with high image quality is proposed. In the device, one pixel is composed of main and sub pixels, in which adjacent sub pixel is patterned with pixel electrodes direction orthogonal to the adjacent one. In this way, light leakage can be generated in the all viewing angle directions except the normal direction, realizing view angle controllable LCD in both horizontal and vertical directions.