‘프리사이클링 활동’을 통한 환경친화적 소비교육 프로그램 지도 방안

오민주(Minju OH),남영숙(Young Suk Nam) 한국환경교육학회 2019 한국환경교육학회 학술대회 자료집 Vol.2019 No.12

GATE 시뮬레이션을 사용한 알루미늄 부가필터 두께에 따른 Digital Radiography의 영상 화질 비교 평가

오민주 ( Minju Oh ),홍주완 ( Joo-wan Hong ),이영진 ( Youngjin Lee ) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.1

X-선 영상에서 필터를 통한 여과의 역할은 영상 형성에 유용한 광자를 이용해 환자의 피폭량을 낮춤과 동시에 영상의 대조도를 높이는 것이다. 영상을 형성하는 데 있어서 저에너지 X-선은 환자 조직의 최초 몇 cm 부위에서 흡수되고 고에너지 부분만을 통과하여 형성되므로, 방사선 여과는 여과물질을 삽입하여 저에너지 X-선을 여과물질로 하여금 흡수시켜 환자의 피폭량을 낮추고 영상의 질을 높인다. 본 연구의 목적은 시뮬레이션을 통해 이상적인 환경에서 부가 필터가 방사선 영상 촬영 시 영상의 화질에 미치는 영향을 확인하고, 실제 방사선 영상을 촬영할 경우와 비교하는 것이다. 이를 위해 시뮬레이션 프로그램인 Geant4 Application for Tomographic Emission (GATE)를 이용해 Polymethylmethacrylate (PMMA) Phantom의 실제 크기, 모양과 재질을 모사하고 부가 필터의 사용유무 및 필터의 두께에 따른 촬영 조건을 설정하여 시뮬레이션 결과 영상을 얻어냈다. 또한, Digital Radiography (DR)장비로 실제 PMMA Phantom을 필터가 없는 경우와 필터가 있을 때 그 두께를 변화시키며 촬영했다. 시뮬레이션의 결과 영상과 실제 실험을 통해 얻은 영상을 각각 Image J 프로그램을 이용해 Contrast-to-noise ratio (CNR) 평가를 실행한 뒤, 시뮬레이션 결과 영상과 최종적으로 도출된 두 영상의 변화 추이를 비교 측정했다. 실험 결과 DR장비와 시뮬레이션 영상 모두 CNR이 감소하는 추세를 보였으며, 이는 결국 영상에서의 대조도 감소로 인해 나타난 결과였다. 이론적으로 관전압 (kVp)이 증가하면 대조도가 감소하고, 이를 통해보았을 때 필터는 저에너지부의 X-선을 흡수하면서 전체적인 선량을 감소시키지만, X-선의 평균에너지를 증가시키는 역할을 한다는 것을 알아볼 수 있었다. In X-ray image, the role of filtration through the filter is to reduce the exposure of the patient by using photon which is useful in formation of the image, and at the same time, enhance the contrast of the image. During interaction between photon and object, low energy X-rays are absorbed from the site of a few cm of the first patient's tissue, and high energy X-rays are the one which form the image. Therefore, the radiation filter absorbs low energy X-ray in order to lower the exposure of the patient and improve the quality of the image. The purpose of this study is to compare the effect on the image quality by differences of added filter through simulation image and actual radiation image. For that purpose, we used Geant4 Application for Tomographic Emission (GATE) as a tool for Monte Carlo simulation. We set actual size, shape and material of Polymethylmethacrylate (PMMA) Phantom on GATE and differentiated the parameter of added filter. Also, we took image of PMMA phantom with same parameter of added filter by digital radiography (DR). Than we performed contrast-to-noise ratio (CNR) evaluation on both simulation image and actual DR image by Image J. Finally, we observed the effect on image quality due to different thickness of added filter, and compared two images’ CNR evaluation’s transitions of change. The result of this experiment showed decreasing in the progress of CNR on both DR and simulation image. It is ultimately caused by decreasing in contrast on image. In theory, contrast decrease with kVp increased. Given that condition, this study found out that filter makes not only decreasing total dose by absorbing low energy of X-ray, but also increasing average energy of X-ray.

온라인 학술 데이터 기반 전문가 추천 기법

방민주(Minju Bnag),한건희(Geonhee Han),김현(Hyeon Kim),편도웅(Dowong Pyun),오영호(Youngho Oh),이현병(Hyeonbyeong Lee),최도진(Dojin Choi),임종태(Jongtae Lim),복경수(Kyoungsoo Bok),유재수(Jaesoo Yoo) 한국정보과학회 2020 한국정보과학회 학술발표논문집 Vol.2020 No.7

강화상 나노입자의 용액 반응성이 구리 도금 박막에 미치는 영향

박지은,오민주,김이슬,이동윤,Park, Jieun,Oh, Minju,Kim, Yiseul,Lee, Dongyun 한국재료학회 2013 한국재료학회지 Vol.23 No.12

To understand how reactivity between reinforcing nanoparticles and aqueous solution affects electrodeposited Cu thin films, two types of commercialized cerium oxide (ceria, $CeO_2$) nanoparticles were used with copper sulfate electrolyte to form in-situ nanocomposite films. During this process, we observed variation in colors and pH of the electrolyte depending on the manufacturer. Ceria aqueous solution and nickel sulfate ($NiSO_4$) aqueous solutions were also used for comparison. We checked several parameters which could be key factors contributing to the changes, such as the oxidation number of Cu, chemical impurities of ceria nanoparticles, and so on. Oxidation number was checked by salt formation by chemical reaction between $CuSO_4$ solution and sodium hydroxide (NaOH) solution. We observed that the color changed when $H_2SO_4$ was added to the $CuSO_4$ solution. The same effect was obtained when $H_2SO_4$ was mixed with ceria solution; the color of ceria solution changed from white to yellow. However, the color of $NiSO_4$ solution did not show any significant changes. We did observe slight changes in the pH of the solutions in this study. We did not obtain firm evidence to explain the changes observed in this study, but changes in the color of the electrolyte might be caused by interaction of Cu ion and the by-product of ceria. The mechanical properties of the films were examined by nanoindentation, and reaction between ceria and electrolyte presumably affect the mechanical properties of electrodeposited copper films. We also examined their crystal structures and optical properties by X-ray diffraction (XRD) and UV-Vis spectroscopy.

비쥬얼 서보잉을 이용한 물류창고 자동화 시스템에 관한 연구

오재욱(Jewuc Oh),서민주(MinJu Sea),이규호(Kyuho Lee),고귀한(Gwihan Ko) 대한전기학회 2012 정보 및 제어 심포지엄 논문집 Vol.2012 No.10

회전 시스템 내 기어 동역학적 특성에 대한 이론적 해석

조성민(Sungmin Cho),안민주(Minju Ahn),오세웅(Seiwoong Oh),윤종윤(Jongyun Yoon),류성기(Sungki Lyu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

In the field of the system dynamics related to the vibration characteristics, there are lots of examples introduced for the translational system, however the analysis of the torsional systems such as driveline in the automobile is rare compared with the translational system. The purpose of this study is to show the simple concepts for the torsional system analysis and explain how to adjust the mathematical methods for the geared motions, which can be applied to the driveline of the automobile. In order to do it, there are several systematical approaches described about how the sub-system motions can be understood with the mathematical descriptions. Based upon this fundamental study, several torsional system modeling methods will be suggested. Therefore, the characteristics of the torsional system and the gear motions will be explained, which can be adjusted in a further study as a next step.

Occerence of microplastic in municipal sewage treatment plant(STPs) in Korea

Hee-Jin Park(박희진),Minju Oh(오민주),Pil-gon Kim(김필곤),Hyun-Joong Kang(강현중),Gweon-Bo Kim(김권보),Byoung-Kyu Ju(주병규),Dong-Hwan Jung(정동환),Won-Seok Lee(이원석),Jung-Hwan Kwon(권정환) 환경독성보건학회 2019 한국독성학회 심포지움 및 학술발표회 Vol.2019 No.4

통제변수의 활용: 변수의 선택과 투입 절차에 관한 제언

박원우(Won-Woo Park),오민주(Minju Oh),유민준(Minjun Yoo) 한국경영학회 2023 經營學硏究 Vol.52 No.6

In social sciences, controlling extraneous variables is crucial to enhance validity and generalizability of a research. However, due to the practical difficulties of experimental designs, most non-experimental research often relies on statistical methods to control the variables. Based on this reality, there have been numerous conceptual and theoretical discussions recently regarding the proper usage of control variables. However, previous studies on the selection, inclusion, and levels of control variables, despite the interrelated nature of their discussions, have limitations as they have been conducted independently and in fragmented ways. To overcome this, we propose an integrated model for the utilization of control variables by synthesizing previous research. Further, to offer a practical help, we provide standardized guideline of control variable usage. Based on the 13 criteria of the integrated model, we analyzed how the control variables were used in 771 articles of Korean Management Review and Korean Journal of Management published from 2011 through 2023. Then, recommendations for the desirable approaches in using control variables are provided, followed by discussions on future research directions.

비동일방법편의(Uncommon Method Bias)의 원인과 해결방안

박원우(Won-Woo Park),박수빈(Soobin Park),이혜림(Healyim Lee),오민주(Minju Oh),맹준성(Junsung Maeng) 한국경영학회 2023 經營學硏究 Vol.52 No.1

Common method bias(CMB) occurs when the measurement of all variables within a conceptual framework is done with a single i.e. common method. The importance of overcoming CMB as a key way to increase the quality of research has been recognized by most scholars, that it is often treated as a basic condition to be fulfilled in doing an empirical study. Thus, the use of uncommon methods became a fad to overcome CMB. By recognizing that uncommon method also has problems, this paper describes uncommon method bias(UMB) thoroughly: What it is, why it happens, and finally the six ways to overcome it. Furthermore, 1,529 empirical papers published in past 14 years (2008~2021) in three prominent Korea journals were analyzed in detail to see to what extent they recognized the issue of CMB and/or UMB, and how they tried to overcome them. Unlike growing recognition and effort to overcome CMB, none of the 1,529 papers has mentioned anything about UMB, not to mention any efforts to overcome it.

박물관 관람객의 정서적 참여에 대한 연구 : 신박물관학의 관점에서

오민주 국립중앙박물관 2018 박물관 교육 Vol.2 No.-

본 연구는 박물관 관람객들이 자신의 가치관을 바탕으로 박물관이 제시하는 특정한 정서적 참여를 어떻게 받아들이고 자신만의 정서적 경험으로 개별화하는지 살펴보았다. 박물관 관람객의 박물관 관람에서의 정서적 경험은 관람객들의 복잡하고 다양한 감정들과 연관되어 있다. 박물관을 방문함으로써 그들의 정체성과 지식, 도덕적 판단을 강화할 수 있고, 과거의 역사적 내러티브에 감정이입을 하며, 자신 스스로를 과거와 연결시키고 현재와 미래를 위해 새로운 이야기를 창의적으로 상상할 수 있게 된다. 최근 신박물관학 학자들은 어떻게 박물관 관람객들이 정서적으로 참여하고 박물관을 경험하는지에 대해 연구하며, 이러한 박물관 관람객의 경험은 관람객의 복잡한 감정들과 연관이 되어있다고 주장한다. 이에 따르면, 박물관 관람객의 감정, 즉 박물관을 방문하는 동안 느끼는 관람객들의 정서적 참여는 관람객 스스로의 경험의 산물인 것처럼 보이지만, 문화적으로 그리고 사회적으로 규제되고 학습되는 것이었다. 박물관 관람객의 정서적 참여를 정확하게 이해하기 위해서는 박물관 관람객의 개인적 요인 외의 외부 요인도 함께 고려하여 박물관 관람객의 정서적 경험을 연구하고 이해해야 할 것이다. New museology provides an innovative paradigm for understanding the active role of visitors in their communication with museums. It has roots in Eilean Hooper-Greenhill’s efforts to stress the need for active communication between visitors and museums. Reconceptualizing their relationship, Hooper-Greenhill (2000) asserted that visitors should engage in meaning-making processes at museums. Visitor engagement is more than just understanding the history of or gaining knowledge about museums while appreciating their exhibitions: it means creating meaning for exhibitions and items by engaging with museums on an entirely different level (Silverman, 1995; Hooper-Greenhill, 1999; Hein, 1998, 2006). Recent museum studies on visitors’ perceptions point out that visitors can experience emotional engagement at museums by contributing their own memories based on personal background to the process of meaning-making (Kavanagh, 2000 cited in Watson, 2015). Such engagement is possible as they recall the past through museums (Watson, 2015) since as Sheila Watson put it, “the past is accorded an emotional register and the present is understood through feelings associated with events and individuals long ago” (Watson, 2015, p.75). Laurajane Smith and Gary Campbell (2015, p. 445) also said that “museums are places where people go to feel.” In view of the above, this article investigates how visitors emotionally engage with museums and historical narratives in accordance with the framework for emotional registers suggested by Smith (2016).