ALOHA 프로그램을 활용한 복합화력발전소 내 암모니아 연료 적용 시 NG/ NH3 혼소율에 따른 피해영향범위 분석

최유정,박희경,이민철 한국가스학회 2024 한국가스학회지 Vol.28 No.1

본 연구에서는 기후변화 해결책 중 하나인 천연가스 복합화력발전소를 암모니아로 연료 전환 시 위험성을파악하기 위해 ALOHA 전산 해석 프로그램을 이용하여 정량적 사고피해영향평가를 실시하였다. 국내 세종복합화력발전소를 대상으로 최악 및 대안의 사고 시나리오를 수립하고, 인화성, 복사열, 과압, 독성의 위험 요인에대해 영향 범위를 산출한 결과, 암모니아 확산에 의한 독성 위험성이 가장 크게 나타났다. 특히, 천연가스-암모니아 혼소율에 따른 사고피해영향평가 분석 결과, 암모니아 저장 및 이송시스템으로부터 누출로 인한 독성의 피해 영향은 선형적 비례의 관계에 있음을 확인하였다. 정량적으로는 피어슨 상관계수가 LOC-1, LOC-2, LOC-3이 각각 0.991, 0.987, 0.989로 98% 이상의 높은 값을 나타냈으며, 선형계수는 LOC-1, LOC-2, LOC-3이각각 133, 70, 29로 낮은 농도 기준일수록 암모니아 혼합 비율에 따른 피해 영향이 증가함을 확인하였다 In this study, a quantitative risk impact assessment is performed using an ALOHA program to identify the risks when applying ammonia as fuel for combined cycle power plants as one of the solutions of climate change. The worst and the alternative accident scenarios are established for the Sejong combined cycle power plant and the effective ranges are calculated in terms of flammability, thermal radiation, overpressure and toxicity. The analysis results show that the toxic risk is the most critical and the effective distance is highly proportional to the mixing ratio of natural gas and ammonia by showing the Pearson’s correlation coefficient over 98% as 0.991, 0.987 and 0.989 for the Level Of Concern(LOC)-1, LOC-2 and LOC-3, respectively. In addition, the coefficients of linearity for LOC-1, LOC-2 and LOC-3 are calculated to 133, 70 and 29, respectively so it can be confirmed that the effective distance increases as the criterion decreases.

한국어교육에서의 명사절 ‘-기가’ 내포문 교육 연구

최유정 국제한국언어문화학회 2015 한국언어문화학 Vol.12 No.3

본 연구는 명사절 ‘-기가’ 내포문 교육 현황을 살펴보고 추가적으로 필요한 교수 내용을 제시하는 데 목적을 두었다. 교육 현황을 알아보기 위해 주요 대학 기관에서 사용하고 있는 교재들을 분석하였고, 실제 학습자들의 ‘-기가’ 사용 양상을 살펴보고자 ‘-기가’ 문법성 판단 테스트 및 학습자 작문을 분석하였다. 한국어 교재 분석을 통해 ‘-기가’ 내포문의 제시 형식의 상이함과 모문 서술어의 명확한 제시가 필요함을 확인하였다. 문법성 판단 테스트 및 학습자 작문 분석에서는 ‘-기’의 문법 범주의 이해, 모문 서술어의 선택, 그리고 유사 항목과의 대치에서 오류를 보이는 것으로 나타났다. 이러한 학습자들의 실제 이해 및 사용의 양상을 통해 ‘-기가’ 내포문 교육에 추가적으로 필요한 교수 내용으로는 첫째 함께 결합하는 서술어를 다양하게 제시하는 것이다. 둘째 다른 유사항목과의 차이점을 교수하고, 셋째 ‘-기’의 문법 범주에 대해 명시적으로 설명을 하는 것이다. The purpose of the study is to examine the teaching the of -giga embedded sentence and to suggest suitable teaching content for th. In order to accomplish its purpose, this study analyzes Korean language textbooks and grammatical errors committed students learning Korean as a foreign language. In addition some intermediate level learners were given a grammaticality judgement test to measure their competence in -giga usage. After analyzing Korean language textbooks, it learners of to learn and practice the -giga embedded sentence Additionally, according to the findings of the grammaticality judgement test, the learners showed low grammaticality competence regarding -giga embedded sentence. It appears that the learner did not have enough knowledge to produce a correct noun-clause-embedded sentence. Therefore, this study stress the importance of well-structured teachings method related to the embedded sentence, and suggests suitable content for teaching the embedded sentence.

국내 시판 아로니아 식초의 이화학적 특성

최유정,장영빈,고은미 한국식품조리과학회 2023 한국식품조리과학회지 Vol.39 No.3

Purpose: This study compares the physicochemical properties of commercially available aronia vinegar in the Korean market. Methods: Eleven vinegar products prepared with aronia were collected and analyzed for anthocyanins, total phenols, proanthocyanidins, and antioxidant activity. Results: The pH, acidity, and soluble solid values were 2.90~3.58, 3.18~6.30%, and 5.60~50.00°Brix, respectively. The color was visually different among the samples. Despite that aronia was a major ingredient, anthocyanins were detected only in three samples, suggesting that anthocyanins were mostly degraded during processing and storage. Total phenols content and ABTS radical scavenging activity were 290.50~751.01 mg GAE/L and 0.90~3.54 mM TE/L, respectively. Anthocyanins and proanthocyanidins contents were positively correlated with redness and negatively correlated with lightness, suggesting that high anthocyanin and proanthocyanidin concentrations resulted in deep reddish hues with lower lightness. Conclusion: Large difference was found in color, anthocyanins content, total phenols content, and antioxidant activity of commercial aronia vinegar.

Seismic capacity re-evaluation of the 480V motor control center of South Korea NPPs using earthquake experience and experiment data

최유정,김민규,최인길 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4

The recent seismic events that occurred in South Korea have increased the interest in the re-evaluation ofthe seismic capacity of nuclear power plant (NPP) equipment, which is often conservatively estimated. Todate, various approachesdincluding the Bayesian method proposed by the United States (US) ElectricPower Research Institute dhave been developed to quantify the seismic capacity of NPP equipment. Among these, the Bayesian approach has advantages in accounting for both prior knowledge and newinformation to update the probabilistic distribution of seismic capacity. However, data availability andregion-specific issues exist in applying this Bayesian approach to Korean NPP equipment. Therefore, thispaper proposes to construct an earthquake experience database by combining available earthquakerecords at Korean NPP sites and the general location of equipment within NPPs. Also, for the betterrepresentation of the seismic demand of Korean earthquake datasets, which have distinct seismiccharacteristics from those of the US at a high-frequency range, a broadband frequency range optimization is suggested. The proposed data construction and seismic demand optimization method forseismic capacity re-evaluation are demonstrated and tested on a 480 V motor control center of a SouthKorea NPP.

시간경과에 따른 전극도자 임피던스의 변화:심방과 심실 전극도자의 차이

최유정,김준수,박정왜,유철웅,이일,박만기,조대경,김선운,이경진,이상훈,홍경표,박정의 대한심장학회 2005 Korean Circulation Journal Vol.35 No.6

Effects of inert gas addition, oxygen concentration, and pressure on explosion characteristics of propylene

최유정,최재욱 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.2

Propylene is used for manufacturing commonly used raw materials and synthetic materials for petrochemical processes. However, it is a volatile and flammable material that poses fire and explosion risks. Nitrogen is inexpensive and can lower the propylene explosion limit because of the dilution effect when used as an inert gas. This study measures the explosion limit, minimum oxygen concentration (MOC), explosion pressure, explosion pressure rise rate, and deflagration index (Kg) values for propylene and nitrogen at 25 oC. Results showed that the lower explosion limit of the explosion range did not significantly change with an increase in pressure from 0.10MPa to 0.25MPa; however, the upper explosion limit increased significantly. Furthermore, the MOC decreased as pressure increased at 25 oC, while both the maximum explosion pressure and maximum explosion pressure rise rate increased, thereby increasing the explosion risk. The risk of propylene was predicted by the Kg values determined using the maximum explosion pressure rise rate and volume based on the experimental data. Therefore, through this study, we provide basic data on safety references for preventing fire and explosion accidents.

경력몰입이 조직몰입과 소진에 미치는 영향 및 슈퍼비전의 조절된 매개효과

최유정,서진우,강종수 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.12

The purpose of this study was to analyze the effects of the career commitment of social workers on organizational commitment and burnout and to verify the moderated mediating effect of supervision. For this study, 280 social workers working at social welfare centers in the Gangwon state were surveyed. The data of 209 workers were used for research after excluding missing data. The analysis was carried out using frequency analysis, descriptive statistical analysis, correlation analysis, and the SPSS Process Macro. The results of this study were as follows: First, career commitment had a significant effect on organizational commitment and burnout. Second, organizational commitment had a significant mediating effect between career commitment and burnout, and finally, supervision had a significant moderated mediating effect. Based on these research results, the practical implications and suggestions for follow-up research were presented.

토론 프로젝트를 통한 KFL 학습자의 말하기 능력 신장에 관한 연구 -캐나다 한 대학의 사례를 중심으로-

최유정,김대희 국어문학회 2019 국어문학 Vol.72 No.-

This study proposes the use of classroom debate activities as a wayto enhance the speaking skills of Korean language learners. Authenticexamples of debate activities conducted in an advanced Korean languagecourse in a Canadian university are described. Based on Cognitive Academic Language Proficiency (CALP), this studydiscusses the debate activities in four basic directions: use of instructorfeedback, language knowledge acquisition, development of higher thinkingability, and debate attitude enhancement. The learners’ post-activity evaluation of the debate activities indicatedinstructor feedback as an extremely effective and valuable means ofimproving the speaking skill learning. 이 연구는 학문 목적 한국어 학습자의 말하기 능력을 신장하기 위한 방안으로 토론 수업을 제안하고, 캐나다의 한 대학에서 실시한 토론 수업의 실제사례를 제시하고 학습자의 반응을 통해 한국어 교육에서 토론 수업의 가능성을 탐색하는 데 목적을 두었다. 이 연구는 고도의 인지활동을 통한 학술적 의사소통 기술(CALP)를 기반으로 교수자 피드백, 지식 획득, 고등 사고 능력 함양, 토론 태도 신장의 4가지 기본 방향으로 토론 수업을 설계하였다. 토론 프로젝트 수행 후, 토론 수업에 대한 학습자들의 반응 중 가장 주목할 부분은 교수자의 피드백이다. 학습자들은 교수자의 피드백이 학습의 효과를 높이는 데 매우 효과적이고 중요한 수단으로 인식하였다. 토론 교육의 개선을 위해서는 교수자와의 상호작용적 피드백, 자유로운의사소통이 가능한 상황 하에서 토론 수행, 즉각적인 의미 구성을 통한 말하기의 숙달, 지속적인 평가한 성찰적 사고와 말하기 실행이 요구된다.

Low threshold voltage operated organic thin film transistor with thin polyimide gate dielectrics

최유정,안택,이미혜 한국고분자학회 2007 한국고분자학회 학술대회 연구논문 초록집 Vol.2007 No.10

Polyimide gate insulator with excellent chemical resistance for photo-lithographic processes

최유정,이미혜,안택 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.1