가연성 냉매 누설 시나리오에 따른 언더후드 내부 유동 해석

이승연(Seungyeon Lee),최종민(Jongmin Choi),이대웅(Daewoong Lee),이해준(Haejun Lee),김민수(Min Soo Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

건설 사고사례 기반 위험요소별 위험도 시각화

이승연(Lee, SeungYeon),김하영(Kim, Hayoung),장예은(Jang, YeEun),이준성(Yi, June-Seong) 대한건축학회 2023 대한건축학회 학술발표대회 논문집 Vol.43 No.1

To analyze the level of risk that comprehensively reflects the accident risk factors, the risk level of each construction work type was analyzed based on the construction accident case data, focusing on the work process and the accident object. Data was collected through web crawling, and risks were analyzed based on detailed work types, work processes, and accident objects. A frequency analysis by work type was performed to derive hazardous work types (reinforced concrete work, temporary work, dismantling and demolition work), and the risk level was analyzed considering the accident object and work process at the same time. The risk assessment results were visualized through a heat map. The results of this study can be used as basis data to establish more realistic safety management plans based on accident cases.

초등학생 한국무용 영재들의 이야기보따리 풀기 : 리틀엔젤스 단원의 삶과 의미

이승연(Lee SeungYeon),정원정(Chung WonChung),박휴경(Park HyuKyoung) 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.6

목적 이 연구는 한국의 전통문화 및 예술을 전파하는 ‘리틀엔젤스’ 소속의 전문무용수이자 일반 초등학생 신분으로 살아가는 ‘한국무용 영재’ 들의 삶을 탐색하는 것이다. 방법 이 연구는 질적사례연구방법을 채택하였다. 초등 한국무용 영재인 ‘리틀엔젤스 단원들의 생활과 삶’이라는 하나의 이슈에 초점을 맞추었으며, 이를 예증하기 위해서 ‘현재의 초등 6학년의 리틀엔젤스 단원’들의 사례와, ‘과거 리틀엔젤스 경험을 가진 무용전공인’의 사례의 체계를 선택하여 연구한 ‘도구적 사례연구’를 시행하였다. 연구참여자는 리틀엔젤스 단원 3명의 초등학생 3명과, 리틀엔젤스 출신 무용전공인 성인 3명을 선정하였다. 주된 자료는 심층면담이며, 귀납적 방법으로 전사-코딩-범주화의 과정을 거쳐 분석하였다. 결과 첫째, 초등영재들은 현재 삶은 ‘백조의 삶’(이중생활의 고충), ‘예술학교 입시생의 삶’, 프로페셔널의 삶으로 범주화되었다. 둘째, 리틀엔젤스 출신 무용전공 성인들은 ‘특별한 경험, 그것만으로도 충분해’, ‘중학생 리틀 단원이 아니어도 무용 계속할 수 있어’, ‘무대밖에 더 넓은 세상이 있어’라는 이야기를 통해 현재의 리틀엔젤스 단원들에게 격려와 조언을 해주고 있다. 결론 이 연구를 통해 리틀엔젤스의 예술영재교육의 가치를 되새길 수 있었지만, 초등영재들이 무용인의 삶에 대해 보다 확장된 시각이 형성될 수 있는 기회의 중요성을 파악하였다. 이를 위한 리틀엔젤스의 변화, 선경험자들의 격려와 응원이 필요해 보인다. Objectives This study explores the life of ‘A talented Korean child’ who is educated by the professional Korean dance as ‘The Little Angels’ that is known for Korean traditional culture and art internationally and ordinary elementary students. Methods This study adopted a qualitative case study method. The research focused on the issue of ‘the usual life and the life as a The Little Angels members’, an elementary Korean dance genius, and to verify, an ‘a case study’ was conducted by selecting ‘The Little Angels members 6th grade at present’ and ‘dance experts with experience as The Little Angels’. Three participants were elementary students as ‘The Little Angels’ and three former members as ‘The Little Angels’. The main data collected in-depth interview and analysis was conducted through the process of transcription-coding-categorization. Results First, elementary students as talented Korean child’s current life was categorized into “Swan s Life” (difficulties for the two roles), “Life of preparing for the art school entrance exam”, and “Professional life”. Second, dance professionals as former ‘The Little Angels’ give encouragement and advice to them such as “Special experience, that s enough”, “You can continue dancing even if you re not a middle school member”, and “There s a wider world outside the stage”. Conclusions Through this study processing, it was confirmed possibility reflecting on the value of ‘The Little Angels ’ with the special artistic education, but also understanding the importance of opportunities for the talented elementary students to form a more expanded view of the life of the dancer. For this, ‘The Little Angels’ seem to need a change and the encouragement and support of those with previous experience.

토마토 재배에서 알루미늄 증착필름과 폴리에틸렌 필름의 온실 측면 보온성 비교

이승연(Seungyeon Lee),표지승(Jiseung Pyo),이문행(Munhaeng Lee),이희경(Heekyoung Lee),김경제(Kyoungje Kim) 한국원예학회 2023 한국원예학회 학술발표요지 Vol.2023 No.5

전문가 시스템을 적용한 관리업무 자동화 구현을 위한 기초 연구

이승연(Lee, SeungYeon),이준성(Yi, June-Seong) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2

중급 한국어 학습자 발화의 조사 연속 구성 연구

이승연 ( Lee Seungyeon ) 이중언어학회 2021 이중언어학 Vol.85 No.-

This study investigates frequency and accuracy of the combined particles observed in the spoken data of intermediate Korean language learners. Comparing the results of the analysis with the previous study results on beginner-level learners’ data, we tried to discover the differences that occur according to the language proficiency level. Free conversation data were collected from 6 intermediate-level learners over 6 months and a spoken corpus was constructed. As a result of collecting and analyzing a total of 132,000 word-size data, the intermediate learners used 23 types of combined particles composition 138 times in total. Of these, 72 were grammatically correct and 66 were classified as errors, resulting in an error rate of about 48.5%. This is 12.7% higher than the beginner’s error rate (35.8%), indicating that the accuracy of the combined particles is very low at the intermediate level. In Korean particle combination, case-markers and particles cannot be used as precedents. However, it seems this rule is not well established in the intermediate level as can be found through the frequent errors such as ‘을/를 도, 은/는도, 이/가도’. We stress the need for comprehensive education on particles at an appropriate time within the curriculum so that errors in the composition of combined particles in the learner’s language would not be ‘fossilized’. Through this study, it was possible to illuminate the process of learners’ grammar acquisition and its development by observing the patterns of particle combination. (SahmYook University)

프리파일링 자켓 하부구조물의 그라우트 연결부에서 전단키 배열이 축하중 용량에 미치는 영향

이승연(Seungyeon Lee),이유진(Yujin Lee),장재국(Jaeguk Jang),구영철(Yeongcheol Gu),지광습(Goangseup Zi) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.6

자켓 구조물과 해저에 관입되는 파일은 그라우트 연결부로 연결되며, 연결부의 전단강도 향상을 위해 전단키 형상을 설계한다. 시공 시 해양 환경하중으로 인해 내측과 외측 강관의 높이 오차를 제어하기 어려우며, 설치 오차가 발생할 경우, 전단키의 배열에도 오차가 발생하여 구조물의 성능이 저하된다. 자켓 구조물을 설치하는 공법 중 프리파일 공법은 포스트파일 공법 대비 대규모 단지에서 경제성이 뛰어나지만 시공 오차의 발생 가능성이 크다. 본 연구는 프리파일 자켓 구조에서 전단키의 배열오차에 따른 파괴 형상과 최대 축하중 용량을 평가하였다. 평가모델은 그라우트 층의 두께, 그라우트의 강도, 전단키의 배열오차비율 세 가지를 변수로 하였다. 검토 결과, 전단키의 배열 오차가 발생하였을 경우 최대 축하중은 최대 10% 이내로 저하되었다. Jacket structures and piles penetrating the seabed are connected through grouted connections. The shear key shape is designed to improve the shear strength of grouted connections. On a construction site, it is difficult to control the height error of the inner and outer steel tubes because of the environmental load. In addition, an installation error leads to an error in the arrangement of the shear keys, degrading the structure's performance. Among the construction methods for installing jacket structures, prepiling is more economical than the post-file method, but construction errors are likely. In this study, the fracture shape and maximum axial load capacity were evaluated according to the arrangement error of the shear key. It was found that when an arrangement error of the shear key occurred, the maximum axial load decreased to within 10%.

수치해석을 활용한 전기차 이차 루프 히트펌프 시스템의 R290 냉매 누설 시 안전성 평가

이승연(Seungyeon Lee),최종민(Jongmin Choi),이대웅(Daewoong Lee),이해준(Haejun Lee),김민수(Min Soo Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

With increasing interest in environmental protection, the technologies related with electric vehicles are rapidly developing. Among them, heat pump technology is attracting attention as it can extend the mileage at winter, through efficient heating. On the other hand, the refrigerant applied to the heat pump system also needs to be more eco-friendly. One of the candidates, R290, has excellent thermal properties but also has high flammability of A3 grade. Although the secondary-loop heat pump system can block the flow of the refrigerant into the cabin in case of leakage, it is necessary to evaluate the risk of ignition in the underhood of the vehicle for safer operation. Therefore, we established a model to analyze the safety of R290 leakage of secondary-loop heat pump system for an electric vehicle, and investigated the effect of various driving conditions and leakage situations on the risk.

Evaluating User Experience Using Physiological Data from Conversational Interfaces for Interactive TV

Seungyeon Lee(이승연),Chan Hyeok Yun(윤찬혁),Gee Won Shin(신지원),Soo Yeon Kim(김수연),Myung Hwan Yun(윤명환) 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.6

Objective: This study aims to investigate TV viewers’ user experience (UX) of a conversational agent (CA) that assisted interactions while watching TV. Background: TV is evolving into an interactive product as technology advances, but the TV interface has not changed much. This can limit the UX of interactive TV viewers. Therefore, it is necessary to identify how the use of voice-interactive interface affects the TV users in order to have a better interactive TV experience. Method: To comparatively analyze the UX with the CA interface and the traditional remote control unit (RCU) interface, physiological measurements (skin conductance; SC) for objective data as well as self-report questionnaires were evaluated. Results: Physiological measurement results showed that SC differed between CA and RCU interactions. Most SC data were high at the beginning of the CA interaction but decreased over time. In RCU sessions, SC maintained a constant value or increased. Consequently, CA had a greater effect on the overall attractiveness while having more emotional appeal. Conclusion: Subjective results showed that CA provided a more positive TV experience regarding emotional aspects. Application: Physiological measurement can provide a more detailed and rich interpretation of the emotional changes and cognitive efforts during human-TV interaction, leading to better understanding of the UX meditated by interactive agent.

정부출연연구소 연구인력의 직무특성이 조직몰입에 미치는 영향 연구

이승연(Seungyeon Lee),박수경(Soo-Kyung Park) 한국기술혁신학회 2018 기술혁신학회지 Vol.21 No.3

본 논문은 정부출연연구소 연구인력의 직무특성과 조직몰입과의 관계에서 조직공정성의 매개효과를 알아보고자 하는데 목적을 두고 있다. 이를 위해 국가과학기술연구회 소속 정부출연연구소 25곳에 근무하는 연구직 362명을 대상으로 설문조사를 실시하여, 이들 관계를 알아보기 위한 다중회귀분석을 시행하였다. 그 결과, 자율성과 피드백 직무특성이 조직몰입에 정(+)의 영향을 나타내었으며 직무특성 중 자율성만이 조직공정성의 매개효과를 갖는 것으로 나타났다. 본 연구는 기존 연구에서 거의 다루지 않았던 정부출연연구소의 연구인력을 대상으로 직무특성을 발견하고 조직공정성과 조직몰입의 관계에 대한 매개효과를 실증분석한 점에서 의의를 찾을 수 있다. The aim of this study lies on verifying the mediation effect of organizational justice in the relationship between R&D personnel’s job characteristics and organizational performance within their Government-sponsored research institute. For this, a survey was conducted on 362 R&D personnel members from 25 state-sponsored research institutes under National Research Council of Science & Technology, and then, a multiple regression analysis was used to seek any possible relationship. As a result, job characteristics such as autonomy and feedback were found to have positive (+) influence on organizational commitment. In addition, the result of the mediation effect of organizational justice indicated that the impact was made only by autonomy. This study finds its significance in the fact that it revealed the relationship between job characteristics and job satisfaction among R&D personnel in state-sponsored research institutes who have rarely been the source of objectives in related studies, and that it revealed organizational justice mediated the relationship.