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전달함수를 이용한 2단 덕트 시스템에서의 연소불안정 해석
김선영,김대식,Kim, Seonyeong,Kim, Daesik 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.4
In this paper, using a transfer function-based analytical model, major factors influencing the acoustics and combustion instability in a two-stage duct system composed of a nozzle and a combustor were derived and their quantitative effects were evaluated. From the acoustic analysis, it was confirmed that the change in reflection coefficient and mean flow could have a great influence on the instability growth rate, and the area ratio and speed of sound ratio between the nozzle and the combustor are also key parameters to determine combustion instability as well as flame transfer functions.
김선영(Kim Seonyeong),전후민(Jeon Humin) 한국사전학회 2010 한국사전학 Vol.- No.16
This study aims at categorizing and describing pragmatic information in synonym dictionary for Korean language learners. Most of learners of second language have difficulty in using synonyms. Thus they consult a dictionary to distinguish synonyms. But at present, synonym dictionary doesn't deal with pragmatic information even though it is as important as syntactic and semantic information. So this thesis is focused on pragmatic information in synonym dictionary. This study regards pragmatic information as a kind of event from perspective of vocabulary use and classifies pragmatic information depending on 5W1H. And this study gives examples of each synonyms and dictionary models. According to this model, description of pragmatic information is not limited to specific microstructure. That is, pragmatic information can be represented in overall descriptions in synonym dictionary, for example, mark(#), definition, exemplification, usage, and usage box, etc.
부모의 스마트폰 의존이 청소년 사이버 비행에 미치는 영향: 부정적 양육 태도와 청소년 스마트폰 의존의 매개 효과
김선영 ( Kim Seonyeong ),한윤선 ( Han Yoonsun ) 한국청소년복지학회 2022 청소년복지연구 Vol.24 No.2
The purpose of this study is to examine the structural relationship between parents’ smartphone dependency and adolescent cyber delinquency. Cyber delinquency is defined as delinquent behaviors in cyber space, and is a growing social concern. Based on theories explaining adolescent delinquency, we hypothesized that negative parenting and adolescent smartphone dependency will mediate the association between parent’s smartphone dependency and adolescent cyber delinquency. Data from the second year of the 2018 Korean Children and Youth Panel Survey(KCYPS) were analyzed. Results are as follows. First, parental smartphone dependency had a direct effect on adolescent cyber delinquency. Second, parental smartphone dependency was associated with adolescent cyber delinquency through negative parenting. Third, parental smartphone dependency was linked with adolescent cyber delinquency through adolescent smartphone dependency. Practical and theoretical implications, as well as directions for future research were suggested.