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Variation of Liftoff height with diluents in Laminar Nonpremixed Lifted Flame
Suhyeon Oh(오수현),Kyu Ho Van(반규호),Chun Sang Yoo(유춘상),Oh boong Kwon(권오붕),Suk Ho Chung(정석호),Jeong Park(박정) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.11
With diluents (CO₂, N₂, and He) added to fuel or oxidizer stream, stationary lifted flame in non-premixed laminar coflow-jet has been studied. For CO₂ and N₂ diluted in oxidizer stream, liftoff height significantly increased with diluent mole fraction, while in He-diluted case liftoff height slightly increased. In fuel-diluted stream, liftoff height as adding He and N₂ slightly increased, but CO₂-diluted flame oscillated. To investigate change of liftoff height with diluent mole fraction, laminar burning velocity, effects of diluents, and buoyancy were considered.
층류 동축류 제트 부상화염에서 소화한계 근처에서의 화염 거동
오수현(Suhyeon Oh),반규호(Kyuho Van),박정(Jeong Park),권오붕(Ohboong Kwon),김세원(Sewon Kim),정석호(Sukho Chung) 한국연소학회 2019 한국연소학회지 Vol.24 No.1
Characteristics of laminar lifted flames in coflow-jet of propane with helium-diluted coflowing air have been studied experimentally and numerically. Two distinct self-excitations existed: a buoyancy-driven self-excitation and a self-excitation with capsized flame near flame extinction. In particular, the flame dynamics for the latter flame were related to buoyancy effects caused by the difference in the densities between the fuel and coflow streams. To identify the mechanism of capsized flame, Mie-scattering technique, OH radical and numerical simulation of cold and reacting flow were performed.
일부 대학생의 SNS 사용시간에 따른 자아존중감과 대인관계의 관련성
손희주(HeeJu Son),임나의(Nahee Im),오수현(Suhyeon Oh),박혜빈(Hyebin Park),김경민(Kungmin Kim),김지현(Jihyeon Kim),정금비(Geumbi Jeong),윤현서(Hyunseo Yoon),이정화(JungHwa Lee) 인문사회과학기술융합학회 2018 예술인문사회융합멀티미디어논문지 Vol.8 No.5
본 연구는 일부 대학생의 SNS 사용시간에 따른 자아존중감과 대인관계의 관련성을 파악하고자 시도하였다. 연구기간은 2017년 3월15일부터 2017년 6월 20일까지였으며, 연구대상은 부산지역 대학생 421명이었다. 연구도구는 설문지를 사용하여 SNS 사용문제척도, 자아존중감척도, 대인관계문제척도를 사용하였으며, 자료 분석은 SPSS 프로그램을 사용하였다. 분석결과 SNS사용자들 중 사용하는 이유로‘뒤쳐지고 싶지 않아서’라고 응답한 군에서 SNS사용 문제가 상대적으로 높았고, ‘정보를 얻기 위해서’라고 응답한 군에서는 문제가 상대적으로 낮았다(F=3.674, p=0.000). SNS를 사용하는 시간이 ‘3시간 이상’인 집단에서 상대적으로 자아존중감이 높게 나타났고(F=0.930, p=0.396), SNS를 사용하는 시간이 많을수록 대인관계 문제가 높게 나타났다(F=4.535 p=0.011). 이를 종합 해 보았을 때, SNS 사용시간이 많을수록 SNS 사용으로 인한 문제와 대인관계에 문제가 많았고, 자아존중감은 높아졌다. 그러므로 대인관계를 유지할 수 있도록 오프라인에서 대인관계 강화를 위한 멘토링 및 집단상담 프로그램 등의 확대운영이 필요할 것으로 사료된다. The purpose of this study was to understand the relationship between self esteem and interpersonal relationship between self esteem and interpersonal relationships based on hours of SNS usage time among some university students. The research was conducted from March 15 to June 20, 2017, the subjects of this study were 421 students enrolled in the Busan area. The research tool used a questionnaire measuring problems of SNS usage problem, self esteem scale and interpersonal relations scale and data analysis was used SPSS program. The results showed that the use of SNS was relatively high in the group that responded I do not want to lag , and the problem was relatively low in the group that responded to get information (F=3.674, p=0.000). The self – esteem was relatively high in the group using the SNS for more than 3 hours (F=0.930, p=0.396), and the interpersonal problem was higher in the group using the SNS(F=4.535 p=0.011). In sum, the more time the SNS was used, the more problems and interpersonal problems caused by the use of SNS, and the self-esteem increased. Therefore, in order to maintain interpersonal relationship, it is necessary to expand mentoring and group counseling programs for strengthening interpersonal relationship in offline.