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Numerical study of oxy-fuel combustion behaviors in a 2MWe CFB boiler
곽유라,윤진한,길상인,이시훈 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.11
Using modified IEA-CFBC(International Energy Association-Circulating fluidized bed combustion) model, a 2MWe oxy-fuel CFBC boiler is simulated and analyzed as a promising solution to reduce greenhouse gas emission from coal power plants. This study evaluated and compared the oxy-combustion characteristics of various coals. Also, the effects of CO2 concentration (71-79 vol%), bed temperature (850 oC) and coal properties on combustion efficiencies, CO2 concentration, acid gas emissions were analyzed. Because of their higher N2 and S content, sub-bituminous and bituminous coals were found to have SOx and NOx concentrations higher than those of anthracite. These simulation results from Oxy-fuel CFBC simulation of various coals can be used as operating parameters for design and development of commercial Oxy-fuel CFBC boilers.
1P-314 국내 바이오매스 및 석탄 혼합에 따라 생산되는 에탄올의 경제성 평가
곽유라,김예빈,이시훈,손정민 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
폐기물 에너지화를 통한 온실가스 감축 방안에 대한 관심이 증가함에 따라 미국, 브라질과 같은 몇몇 국가에서는 바이오매스를 통해 얻은 에탄올을 일부 사용하고 있는 추세에 있다. 바이오 에탄올의 경우 탄소를 포함하고 있을 뿐만 아니라 생장 과정에서 이산화탄소를 흡수하기 때문에 탄소 중립으로 보고 있으며, 바이오매스를 통해 생산되는 에탄올의 경우, 옥탄가가 110으로 가솔린보다 약12% 높다. 또한, 바이오 에탄올은 약 35%의 산소를 포함하고 있어 휘발유에 혼합 사용 시 희박 연소가 가능하여 일산화탄소 배출량을 10~30% 가량 낮출 수 있다는 장점을 지니고 있다. 이에 본 연구에서는 바이오폐기물 및 석탄 혼합물과 에탄올 전환 공정에 대한 타당성 조사를 수행하였다. 이중 유동층 기화기, 타르 개질기, 촉매 반응기 및 보조 설비로 구성된 상업 규모의 열화학 공정을 사용하여 분석하였다. 또한, 바이오 폐기물의 운송, 수집 비용을 포함하는 다양한 규모의 공정에서 합성 에탄올의 경제적 가치에 대해 평가하였다.
Cross-modal Correspondence Between Acoustic Feature and Shape
곽유나,김채연 한국인지및생물심리학회 2018 한국심리학회지 인지 및 생물 Vol.30 No.3
Our brain tends to associate stimulus features across the senses in a non-random manner. For example, people show consistency in labelling a rounded shape ‘maluma’/‘bouba’ and a spiky shape ‘takete’/‘kiki’. Previous studies have attributed this phenomenon to the correspondence between sound and shape, but without controlling for other potential factors (i.e., linguistic/orthographical factors). The present study examines the role of acoustic aspect per se by manipulating articulatory gestures to generate synthetic speech sounds not confined to a specific language. Participants were asked to choose either a rounded or spiky shape to indicate the shape that better matched each synthetic speech sound. The results demonstrate that shape choice was systematically mapped on to the dimensions manipulated to generate the sounds. These results indicate that acoustic features indeed drive the association between sound and visual shape.
곽유신,한정연,최용의 고려인삼학회 2019 Journal of Ginseng Research Vol.43 No.2
Background: Protopanaxatriol (PPT) is an aglycone of ginsenosides, which has high medicinal values. Production of PPT from natural ginseng plants requires artificial deglycosylation procedures of ginsenosides via enzymatic or physicochemical treatments. Metabolic engineering could be an efficient technology for production of ginsenoside sapogenin. For PPT biosynthesis in Panax ginseng, damarenediol-II synthase (PgDDS) and two cytochrome P450 enzymes (CYP716A47 and CYP716A53v2) are essentially required. Methods: Transgenic tobacco co-overexpressing P. ginseng PgDDS, CYP716A47, and CYP716A53v2 was constructed via Agrobacterium-mediated transformation. Results: Expression of the three introduced genes in transgenic tobacco lines was confirmed by Reverse transcription-polymerase chain reaction (RT-PCR). Analysis of liquid chromatography showed three new peaks, dammarenediol-II (DD), protopanaxadiol (PPD), and PPT, in leaves of transgenic tobacco. Transgenic tobacco (line 6) contained 2.8 mg/g dry weight (DW), 7.3 mg/g DW, and 11.6 mg/g DW of PPT, PPD, and DD in leaves, respectively. Production of PPT was achieved via cell suspension culture and was highly affected by auxin treatment. The content of PPT in cell suspension was increased 37.25-fold compared with that of leaves of the transgenic tobacco. Transgenic tobacco was not able to set seeds because of microspore degeneration in anthers. Transmission electron microscopy analysis revealed that cells of phloem tissue situated in the center of the anther showed an abnormally condensed nuclei and degenerated mitochondria. Conclusion: We successfully achieved the production of PPT in transgenic tobacco. The possible factors deriving male sterility in transgenic tobacco are discussed.
중학생의 자극추구성향이 사이버폭력 가해행동에 미치는 영향: 게임중독과 도덕적 이탈의 순차매개효과
곽유신,이소연 한국정서행동장애학회 2023 정서ㆍ행동장애연구 Vol.39 No.1
This study aimed to understand how sensation seeking affects middle school students’ cyberbullying behaviors through the sequential mediation of game addiction and moral disengagement. The subjects of this study were 223 middle schools students lived in the metropolitan area. The students completed the Sensation Seeking Scale, Korean Child/Youth Game Addiction Scale, Mechanisms of Moral Disengagement Scale (MMDS) and the Cyberbullying Experience Scale. Collected data were analyzed by SPSS 25.0 and Hayes’ PROCESS Macro. The results indicated as follows: First, middle school students’ sensation seeking was positively and significantly influenced on cyberbullying behaviors. Second, middle school students’ sensation seeking had direct effects on the cyberbullying behaviors, while it also had significant indirect effects on the cyberbullying behaviors through game addiction and moral disengagement in sequence. The results of this study are meaningful in that it specifically verified the mechanism by which middle school students’ sensation seeking affects cyberbullying behaviors. In particular, it suggests the importance of considering not only game addiction, a media factor, but also sensation seeking, an internal factor, and moral disengagement, a social cognitive factor, when identifying factors that affect cyberbullying behaviors. These findings are expected to be used as basic data to seek appropriate prevention and intervention in adolescence when the seriousness of the cyberbullying problem emerges. 본 연구에서는 중학생의 자극추구성향이 사이버폭력 가해행동에 미치는 영향에서 게임중독과 도덕적 이탈의 순차매개효과를 검증하였다. 수도권에 소재한 중학교 3곳에 재학 중인 중학생 1∼3학년 223명을 대상으로 청소년용 자극추구성향 척도, 아동/청소년 게임중독 척도, 도덕적 이탈 척도(MMDS), 청소년용 사이버불링 가해 경험 척도를 실시하였다. 수집된 자료는 SPSS 25.0과 Hayes(2018)의 PROCESS macro를 이용하여 상관분석, 순차매개분석을 실시하였다. 연구의 결과는 다음과 같다. 첫째, 중학생의 자극추구성향이 높을수록 사이버폭력 가해행동 수준이 높은 것으로 나타났다. 둘째, 중학생의 자극추구성향이 사이버폭력 가해행동에 미치는 영향에서 게임중독과 도덕적 이탈의 순차매개효과를 검증한 결과, 중학생의 자극추구성향이 게임중독과 도덕적 이탈을 순차적으로 거쳐 사이버폭력 가해행동에 영향을 미치는 순차매개경로가 확인되었다. 본 연구의 결과는 중학생의 자극추구성향이 사이버폭력 가해행동에 영향을 미치는 기제를 구체적으로 검증하였다는 데 의의가 있으며, 특히 중학생의 사이버폭력 가해행동에 영향을 주는 요인을 파악할 때 매체 요인인 게임중독뿐만 아니라 개인 내적 요인인 자극추구성향과 사회인지 요인인 도덕적 이탈의 수준을 통합적으로 고려하는 것의 중요성을 시사한다. 이러한 결과는 사이버폭력 문제의 심각성이 대두되는 청소년기에 적절한 예방과 개입을 모색하기 위한 기초자료로 활용될 것으로 기대된다.
IEA-CFBC 모델을 이용한 저급탄의 순산소 연소 특성 분석
곽유라 ( You Ra Gwak ),김예빈 ( Ye Bin Kim ),길상인 ( Sang In Keel ),윤진한 ( Jin Han Yun ),이시훈 ( See Hoon Lee ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5
The application of an oxy-combustion circulating fluidized bed combustor (Oxy-CFBC) for low grade coals has recently developed in the world to meet the continuous increase of energy demand and to achieve the reduction of greenhouse gases. Since demo plants for Oxy-CFBC have been developed, the combustion properties of Oxy- CFBC in various operation conditions, such as gas flow rates, combustion temperature, fuel, and so on, should be investigated to develop design criteria for a commercial Oxy-CFBC. In this study, a computational simulation tool for Oxy- CFBC was developed on the basis of the IEA-CFBC (International Energy Agency Circulating Fluidized Bed Combustor) model. Simulation was performed under various conditions such as reaction temperature (800 ℃~900 ℃), oxygen contents (21%~41%), coal feeding rate, Ca/S mole ratio (1.5~4.0), and so on. Simulation results show that the combustion furnace temperature is higher in oxy 1 than air fired. However, the temperature gradient tended to decrease with increasing oxy mixing percent. In case of SO<sub>x</sub>, the higher the Ca/S mole ratio and oxy mixing percent, the higher the desulfurization efficiency.