항공기용 ABS 제동시스템의 노면 조건별 제동특성에 관한 시험적 연구

이미선,Yi, Mi-Seon 한국항공운항학회 2017 한국항공운항학회지 Vol.25 No.2

Results of the experimental research are described in this thesis, which are about braking characteristics of aircraft ABS brake system with different ground conditions. Dynamo-tests were conducted with the state of the application aircraft condition and with two different ground conditions. The Braking characteristics on each ground condition were drawn from the results of occurrence of skid, braking distance and deceleration. The braking performance of the application aircraft could be anticipated and the efficient range of braking operation could be set with those results.

전자기식 충격흡수구조의 설계를 위한 동특성 해석 및 실험

이미선,배재성,황재혁,임재혁,Yi, Mi-Seon,Bae, Jae-Sung,Hwang, Jae-Hyuk,Im, Jae-Hyuk 항공우주시스템공학회 2012 항공우주시스템공학회지 Vol.6 No.1

A shock absorber with magnetic effects is suggested for a lunar space-ship expected to launch in 2025. The device consists of a copper steel combined tube, two magnets, and a piston. The piston is designed to move a magnet through the tube when it is pushed by an external impact. While the magnet is moving in the tube, it generates the eddy current force with the copper part of the tube and it also makes the large friction force with the steel part of the tube. Beside, it gets resistive forces against its movement such as the magnetic force with a steel-ring at the first time of the movement and the repulsive force with a same pole opposed magnet at the end time of the movement. In this thesis, results of analyses and experiments of each force are represented and the expected performance of the electromagnetic shock absorber is drawn from the results.

와전류를 이용한 제동장치의 실험적 동특성 연구

이미선,곽동기,배재성,황재혁,Yi, Mi-seon,Kwag, Dong-gi,Bae, Jae-sung,Hwang, Jai-Hyuk 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.2

Eddy currents are generated when a moving conductor is exposed to a stationary magnetic field, or vice-versa. These currents create their own magnetic field, causing a repulsive force between the magnetic material and the conductor. Using this concept, a magnetic brake system can be established by the permanent magnets and a conductive material. In this paper, the eddy current effects on a magnetic brake system which consists of 2 pairs of magnets and a conductor are investigated by using a electromagnetic software, and the results of simulations are compared with experiments. It can be concluded how the arrangement of magnets effects on the dynamic characteristics of the eddy current brake system.

마찰을 고려한 노즈 랜딩기어의 비선형 쉬미 해석

이미선(Mi-Seon Yi),배재성(Jae-Sung Bae),황재혁(Jae-Hyuk Hwang) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.7

쉬미는 항공기의 이착륙 시 랜딩기어가 주행도중 측방향 및 조향방향의 진동이 발생하는 현상이다. 쉬미 현상은 스트럿의 낮은 강성, 랜딩기어 내부의 유격, 휠의 불균형이나 마모된 부품 등으로 인해 발생하며, 항공기의 안정성을 저하시킨다. 본 연구는 소형항공기의 쉬미 안정성 검토를 위해 수행되었다. 수치해석을 위하여 소형항공기의 전방 착륙장치를 선형시스템으로 모델링하고 상태방정식을 수립하였다. 근궤적 기법을 이용한 주파수 영역 해석과 4차 Runge-Kutta 방법을 이용한 시간영역 해석을 통해 쉬미 현상을 예측하였고 주요 변수의 설계범위를 검토하였다. 현 착륙장치는 와셔의 압축력을 이용하여 조향 방향 마찰을 가함으로써 쉬미현상을 저감하는 기법을 채택하고 있으므로 마찰을 기술함수를 이용하여 선형화시키고 상태방정식에 적용하여 해석을 수행함으로써 쉬미의 발생이 저감되는 결과를 확인하였다. Shimmy is a self-excited vibration in lateral and torsional directions of a landing gear during either the take-off or landing. It is caused by a couple of conditions such as a low torsional stiffness of the strut, a free-play in the landing gear, a wheel imbalance, or worn parts, and it may make the aircraft unstable. This study was performed for an analysis of the shimmy stability on a small aircraft. A nose landing gear was modeled as a linear system and characterized by state-equations which were used to analyze the stability both in the frequency and time-domain for predicting whether the shimmy occurs and investigating a good design range of the important parameters. The root-locus method and the 4th Runge-Kutta method were used for each analysis. Because the present system has a simple mechanism using a friction to reinforce the stability, the friction, a non-linear factor, was linearized by a describing function and considered in the analysis and observed the result of the instability reduction.

자기효과를 이용한 충격흡수장치의 감쇠계수에 관한 연구

이미선(Mi-Seon Yi),배재성(Jae-Sung Bae),황재혁(Jae-Hyuk Hwang),황도순(Do-Sun Hwang) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.9

본 연구는 달착륙선의 착륙장치 개발 연구로써 자기효과를 이용한 충격흡수장치를 제안 한다. 충격흡수장치는 금속튜브와 피스톤 로드(piston rod), 피스톤 로드를 따라 가진되는 영구자석으로 구성되며 금속튜브와 영구자석사이에 존재하는 자기력과 상대운동에 의해 발생되는 와전류 효과 등의 자기효과를 이용하여 충격에너지를 분산 및 소산시킨다. 또한 자석을 같은 극을 마주보게 배치함으로써 코일 스프링과 유사한 충격흡수 효과를 얻을 수 있다. 이 장치는 구조가 단순하고 오일이나 가스의 사용이 불필요하므로 우주공간에서 사용이 용이하다. 자기 효과를 이용한 충격흡수장치의 감쇠와 스프링 특성을 전자기학 이론과 유한요소해석을 통하여 관찰하고 장치를 설계, 제작하여 실험을 수행한 결과와 비교분석하였다. The shock absorber with magnetic effect is suggested for a lunar lander. The shock absorber consists of a metal tube, a piston rod, and several permanent magnets moved by a piston rod in the tube, and the shock energy can be dispersed and dissipated by magnetic effects such as the magnetic force existed between a metal and magnets and the eddy current effect generated by a relative motion with a conductor and magnets. Besides, the shock-absorbing effect similar to that of a coil spring can be obtained by arranging the magnets in line, which are facing the same polar each other. The device has a very simple structure and is usable in space due to the unnecessariness of any oil or gas. The shock absorber was designed and manufactured for experiments and its spring and damping characteristics were studied by the theoretical, analytical and experimental methods.

우리나라 유치원 방과후과정 관련 연구의 동향 분석

이미선(Yi, Mi-Seon),배지현(Bae, Jee-Hyun) 한국열린유아교육학회 2018 열린유아교육연구 Vol.23 No.5

본 연구는 우리나라 유치원 방과후과정 관련 연구의 동향을 고찰하여 지속적으로 증가하고 있는 유치원 방과후과정 연구를 위한 기초자료를 제공하는데 목적이 있다. 1991년도부터 현재까지의 학술지 논문을 Excel로 분석하였다. 분석결과 첫째, 연도별 동향은 2005년부터 2010년까지 논문이 지속적으로 증가하였고, 2005년과 2015년에 가장 많이 발표되었다. 둘째, 연구대상별 동향은 방과후과정 교사대상 연구가 가장 많았고, 유아, 부모 순으로 나타났다. 셋째, 연구내용별 동향은 교사의 방과후과정 운영 경험과 관련된 연구가 많았다. 넷째, 연구방법별 동향은 양적연구가 높게 나타났고, 질문지, 검사지 활용한 관찰법이 많이 활용됨에 따라 차이검증 분석방법이 많이 사용되었다. 본 연구의 시사점은 유아교육기관의 엄연한 교육시간임에도 불구하고 종일반, 시간연장제 등 혼재된 용어로 가치를 인정받지 못하던 유치원 방과후과정에 대한 연구적 접근에 초점을 두어 추후 연구를 위한 기초를 제공하였다는 점, 연구의 동향에 나타난 방과후과정 유아들의 부정적인 발달양상을 밝힘으로써, 양적으로 늘어나는 방과후과정의 질적인 향상과 종합적 돌봄의 필요성을 논하였다는 점이다. The purpose of this study is to provide basic information for continually increasing researches on kindergarten after-school by examining research trend on kindergarten after-school in South Korea from 1991 to 2018 by Excel. The findings of the study are as follows: First, the results of annual tendency showed that the number of thesis consistently increased from 2005 to 2010 and most of them were published between 2005 and 2015. Second, in the tendency for study targets, researches on after-school teachers were the greatest, followed by infants and parents. Third, in the tendency for study contents, researches on teachers’ experiences in operating after schools were the greatest. Fourth, in the tendency for study methods, the quantitative researches were high and the difference verification method was used a lot as the observation method, such as questionnaires and test papers were largely used. The implications of this study are as follows. First, the study provides a basis for further studies focusing on the research approaches towards kindergarten after-school of which value was unacknowledged due to usage of mixed terms, such as full-day class and expanded time program, despite its officially approved status and time for early childhood education by revealing the negative aspect of development for young children in after-school shown in the tendency of the study.

유격을 고려한 노즈 랜딩기어의 비선형 쉬미 해석

이미선(Mi-Seon Yi),황재업(Jae-Up Hwang),배재성(Jae-Sung Bae),황재혁(Jae-Hyuk Hwang) 한국항공우주학회 2010 韓國航空宇宙學會誌 Vol.38 No.10

본 논문에서는 유격을 고려한 항공기 전방 착륙 장치의 쉬미 현상을 연구하였다. 쉬미는 항공기의 이착륙 시 랜딩기어가 주행도중 측방향과 조향방향으로 진동에 놓이는 현상이다. 이 현상은 스트럿의 낮은 강성, 랜딩기어 내부의 마찰과 유격, 휠의 불균형이나 마모된 부품 등으로 인해 발생하며, 항공기의 안정성을 저하시킨다. 유격은 비선형 요소이기 때문에 기술 함수로 선형화 하여 주파수 영역에서 안정성해석을 수행하였고, 4차 Runge - Kutta를 이용하여 시간영역에서 안정성해석을 수행하였다. 본 연구에서는 수치적인 해석법을 통해 쉬미현상의 선형 동특성과 비선형 동특성을 조사하였다. 유격을 고려한 비선형 수치 해석결과, 선형 임계속도보다 낮은 속도에서 제한주기진동이 발생하는 등, 유격으로 인해 쉬미 안정성이 저감되는 결과를 관찰하였다. In this paper, we studied the shimmy phenomena of an aircraft nose landing gear considering free-play. Shimmy is a self-excited vibration in lateral and torsional directions of a landing gear during either the take-off or landing. This phenomena is caused by a couple of conditions such as low torsional stiffness of the strut, friction and free-play in the gear, wheel imbalance, or worn parts, and it may make an aircraft unstable. Free-play non-linearity is linearized by the described function for a stability analysis in a frequency domain, and time marching is performed using the fourth-order Runge-Kutta method. We performed the numerical simulation of the nose landing gear shimmy and investigated its linear and nonlinear characteristics. From the numerical results, we found limit-cycle-oscillations at the speed under linear shimmy speed for the case considering free-play and it can be concluded that the shimmy stability can be decreased by free-play.

슈토름의 동화『레겐트루데』에 나타나는 신화적, 종교적 상징 분석

이미선 ( Mi Seon Yi ) 한국독어독문학회 2009 獨逸文學 Vol.112 No.-

Unter Storms Marchen enthalt Die Regentrude am meisten volksmarchenhafte und gleichzeitig novellistische Elemente. Daruberhinaus besitzt das Werk viele Symbole, die auf ihre mythische und religiose Bedeutung hin interpretiert werden konnen. Dies sollte allerdings nicht in dem Sinne von der griechischen Mythologie und dem Christentum her geschehen. Mythos und Religion vereinigen sich in diesem Werk. Menschen begehren immer, sich den Gottern zu nahern. Sie vergottern die Natur und glauben an deren Kraft. In diesem Werk treten Regentrude und Feuermann als unirdische Wesen auf. Sie sind gleichzeitig Gott und Religion, weil das Leben der Menschen von ihnen abhangig ist. Besonders Regentrude verweist auf eine Religion fur die Menschen, die das Leben im Einklang mit der Natur zu fuhren wissen. Mit den Figuren Regentrude und Feuermann werden Regen und Feuer kontrastiert. Die beiden Elemente bedeuten nicht nur den gegensatzlichen Naturcharakter, sondern auch Religion und Wissenschaft oder Frauen und Manner. Sie sind in einer Konfliktsituation. Um diesen Konflikt zu losen, spielen sowohl Mensch als auch Natur ihre eigene Rolle, mythische Bedeutungen in sich tragend. Die Jungfrau Maren vermittelt Menschen und Gottin wie eine Priesterin und Frau Stine tradiert die Sage uber Regentrude. Die Weide, die Himmel und Erde verbindend tief im Boden wurzelt, ist ein Eingang zur gottlichen Welt. Menschen und Gott existieren auf den ersten Blick in anderen Welten, die Menschen auf der Erde und Gott, d.h. Regentrude unter der Erde. Sie sind jedoch auf einer Ebene, die wie ein Mobiusband zwei Dimensionen hat, aber eigentlich eine Flache ist. Mit vielen mythischen Symbolen zeigt Storm, dass das harmonische Verhaltnis von Mythos oder Religion und Vernunft das Leben des Menschen fruchtbar machen kann.

Chloroplast Genome Assembly and Identification of Polymorphic Loci from Wild-simulated Ginseng (Panax ginseng)

Mi Sun Lee(이미선),Young Hoon Jeong(정영훈),Ju Hyeok Kim(김주혁),Min Seon Park(박민선),Jin Su Gil(길진수),Jae Kyung Byun(변재경),Hyoung Chun Kim(김형춘),Yi Lee(이이) 한국약용작물학회 2023 한국약용작물학회 학술대회논문집 Vol.2023 No.1

항암화학요법을 받는 암환자에게 적용한 전화상담이 디스트레스, 불안과 우울 및 치료관련 부작용 발생에 미치는 효과

옥오남(Ok, Oh Nam),남민선(Nam, Min Sun),이미선(Yi, Mi Sun),조선미(Cho, Seon Mi),김은지(Kim, Eun Ji),함윤희(Ham, Yun Hee),권인각(Kwon, In Gak) 대한종양간호학회 2017 Asian Oncology Nursing Vol.17 No.1

This study is aimed at identifying the effects of telephone counseling as nursing support on distress, anxiety, depression, and adverse events in cancer patients undergoing their first chemotherapy. Methods: This was a randomized controlled trial (pretestposttest design). A total of 70 patients who showed 4 or higher distress scores were selected from the screening process. Four patients dropped out; therefore, 66 patients participated in this research. Thirty-two and 34 patients were randomly assigned to the experimental and the control group, respectively. After a preliminary survey, telephone counseling support was given to the experimental group at three time points. The post survey was done before the second cycle of chemotherapy. Results: Regarding distress, both groups showed a statistically significant decrease in the scores: 3.4 for the experimental group and 1.8 for the control group (p=.002). Furthermore, the experimental group demonstrated a statistically significant decrease relative to the control group. Anxiety and depression showed no statistically significant difference between the two groups. Conclusion: This study concludes that nursing support through phone counseling is effective in decreasing distress in patients undergoing chemotherapy for the first time.