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회전형 저온 플라즈마 시스템을 이용한 분말식품의 균일한 살균 연구
김명찬,박덕모,한진수,우인봉,김동후,장성은,윤찬석,김인,Kim, Myung Chan,Park, Duck Mo,Han, Jin Soo,Woo, In Bong,Kim, Dong Hoo,Jang, Seong Eun,Yoon, Chan Suk,Kim, In 한국식품영양학회 2018 韓國食品營養學會誌 Vol.31 No.2
In this study, a relatively effective process is used to sterilize Escherichia coli on the surface of micro-sized calcium citrate powder using nitrogen and argon as process gases in a low-temperature vacuum plasma treatment. The purpose of this study is to confirm and to introduce the effectiveness of homogeneous surface treatment for the sterilization of fine inorganic powder by the rotatable low-temperature RF plasma system designed by ourselves. The results of the test using 3M petrifilm showed that there were no remarkable spots in the case of the surface of plasma treated powder, whereas the untreated powder showed many blue spots, which indicating that the E. coli was alive. After 5 days, in the same samples, the blue spots were seen to be larger and darker than before, while the plasma-treated powder showed no changes. The results from FE-SEM analysis showed that the E. coli was damaged and/or destroyed by reactive species generated in the plasma space, resulting in the E. coli being sterilized. Furthermore, the sterilization effects according to the selected parameters ($N_2$ and Ar; flow rate 30 and 50 sccm) adapted in this study were mutually similar, regardless of such different process parameters, and this indicates that homogeneous treatment of powder surfaces could be more effective than conventional methods. Therefore, the plasma apparatus used in this study may be a practical method to use in a powerful sterilization process in powder-type food.
휜이 달린 수소저항합금 베드의 수소저장 성능의 수치적 예측
김명찬,이상용,구재학,Kim, Myeong-Chan,Lee, Sang-Yong,Gu, Jae-Hak 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.4
Heat and mass transfer behaviors of metal hydride beds were predicted by solving a set of volume-averaged equations numerically both for the gas (hydrogen) and the solid(metal hydride) phases. Time variations of temperature and hydrogen concentration ratio distributions were obtained for internally cooled, cylindrical-shaped beds with metal(aluminum) fins imbedded in them. Also, time variations of the space-averaged hydrogen concentration ratio were obtained. Temperature and velocity of the coolant, hydrogen pressure at the gas inlet, and the fin spacing were taken as the parameters. The hydrogen absorption rate increases with the higher velocity and the lower temperature of the coolant, and with the decrease of the fin spacing. Increasing of the hydrogen pressure at the gas inlet also promotes the rate of absorption though the increasing rate gradually slows down. The amount of the hydrogen storage per unit volume of the bed decreases with the tighter fin spacing despite of the higher absorption rate ; therefore, there should be an optimum fin spacing for a given volume of the system and the amount of the hydrogen storage, in which the absorption rate is the highest.
여성 알코올 중독자의 중독과 회복과정 경험에 대한 내러티브 탐구 : 사회적 낙인과 지지를 중심으로
김정숙(Kim Jungsuk),전아영(Jeon A yeong),김정희(Kim Junghee),김계순(Kim Gyesoon),김명찬(Kim Myeongchan),금창민(Keum Changmin) 한국열린교육학회 2021 열린교육연구 Vol.29 No.5
연구는 여성 알코올 중독자의 알코올 사용에 대한 통제력 상실을 경험한 중독과정과 알코올 중독자임을 인정하고 단주생활로 새로운 삶을 만들어 가는 회복과정의 경험을 세밀하게 연구하고자 하였다. 본 연구를 위해서는 Clandinin과 Connelly(2000)이 제안한 삼차원적 내러티브 연구방법과 절차에 의해 진행되었다. 참여자의 알코올 중독이전의 경험, 중독과정의 경험, 회복과정의 경험에서 사회적 낙인과 지지가 어떻게 관련되어 있는지가 연구의 퍼즐이었다. 이를 위해 2021년 4월에서 5월까지 부산·경남지역에 거주하는 회복과정에 있는 알코올 중독 경험 여성 4인에 대한 심층인터뷰를 실시하였다. 내러티브의 삼차원적 탐구 공간에서 공통경험은 중독이전 경험, 중독과정 경험, 회복과정 경험의 3단계로 나누어 분석하였다. 첫째, 시간성의 차원에서의 경험은‘억압받는 나’,‘자기 연민과 무력감’,‘자기인식과 자기사랑’ 으로 나타났다. 둘째, 상호작용 차원에서의 경험은‘돌봄 받지 못한 방임상태’,‘스스로 수치심을 느끼는 고립된 삶’,‘관계 회복을 위한 결단’ 이었다. 셋째, 상황 차원에서의 경험은‘알코올 중독 가정 내의 성장’,‘사회적 고립’,‘단주모임 참여’로 도출되었다. 넷째, 사회적 낙인과 사회적 지지의 변화 과정경험은‘알코올 중독자인 나’,‘서로에게 힘이 되어주는 멤버’의 외재적 부분과‘수치스럽고 초라한 나’에서‘스스로를 사랑하는 나’의 내재적 부분의 주제로 확인할 수 있었다. This study aims to describe detailed recovery experiences of female alcoholics who once lost control of drinking alcohol, then acknowledged their addictions, and have been carving out new lives sober. The researchers used the three-dimensional narrative methodology of Claninin and Connelly (2000). The inquiry puzzle discovered how social stigma and support affect the experiences of those who were in pre-addiction, addiction, and recovery processes. The researchers had in-depth interviews with four recovered female alcoholics who resided in Busan and Gyeongsang Province, from April to May 2021. The common experiences were classified as follows. Firstly, there were a) a self-repression, b) self-pity and helplessness, and c) self-awareness and self-love in the continuity dimension. Secondly, in terms of situational dimension there were a) a growing-up in an alcoholic family, b) social isolation, and c) attending AA (Alcohol Anonymous) meetings. Thirdly, there were a) feelings of abandonment without sufficient care, b) isolation due to feelings of shame, and c) a decision to recovering some relationships. Lastly, positive experiences by overcoming the social stigma with help of social support are described as both external and internal as follows. In the external aspect, the experiences from perceiving self as an alcoholic to the AA meeting members with the social support. And, internally, the experiences of moving away from feelings of ‘meaningless and shameful self’ to feeling ‘self-love’ were observed and confirmed.
2017년 제주시 대기 중 PM<sub>2.5</sub>의 화학적 조성과 오염원 추정
김수미 ( Su-mi Kim ),김길성 ( Kil-seong Kim ),현성수 ( Sung-su Hyun ),김정하 ( Jeong-ha Kim ),김명찬 ( Myeong-chan Kim ),김봉진 ( Bong-jin Kim ),이기호 ( Ki-ho Lee ) 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.2
In this study, to characterize chemical compositions and identify the sources of PM<sub>2.5</sub> in the urban area of Jeju, Korea, PM<sub>2.5</sub>-bound concentrations of 8 ionic species and 12 elements were measured from samples collected at the downtown area from January to December 2017. Positive matrix factorization (PMF) was applied to these PM<sub>2.5</sub> data-sets to identify the diverse sources in Jeju City. The average PM<sub>2.5</sub> mass concentration for the study period was 18.31±9.72 μg/m<sup>3</sup>. The contributions of water-soluble ionic species, elements and unknown components to PM<sub>2.5</sub> mass were 55.8%, 2.1%, and 42.0%, respectively. PMF analysis showed that a total of six source types were identified to be important. These sources are the industry related source, secondary sulfate and oil combustion, soil, biomass burning and vehicles, secondary nitrate, and sea salt.
김명찬 ( Myeung Chan Kim ) 한국교육인류학회 2015 교육인류학연구 Vol.18 No.2
이 연구는 낮은 사회경제적 지위를 가진 가족과 그 구성원에게 서울대학교가 무엇을 의미하는지를 자문화기술지(autoethnography)를 통해 보여주고자 하였다. 낮은 사회경제적 지위를 가진 가족들은 자신들의 결핍을 학력(學歷)을 통해 극복하고자하는 동기를 지니고 있고, 적합한 구성원이 있는 경우 가족 내의 모든 자원을 집중시킴으로 가족전체의 목표를 이루고자 한다. 이러한 과정에서 희생자가 생겨나게 되고, 그러한 희생의 기초 위에서 목표를 달성하게 된다. 이것은 가족들의 융합이 높고, 자아분화수준이 낮은 위험을 초래함으로써 역기능적 가족관계를 초래할 수 있다. 역기능적 관계의 희생자로서 구성원은 홀로 서기에 어려움을 겪고, 홀로 서기에 성공한 이후에도 내적 결핍과 공허감을 느낄 수 있다. 따라서 외적 성취로서 학력(學歷)은 이들의 욕구를 부분적으로 채워주는 한계를 지니고 있으므로 먼저 생애 초기의 상처로 인한 자기 내면의 초라하고 작은 모습을 직면하고 알아주는 과정이 우선되어야 할 것이다. 이 연구가 학력(學歷)을 통해 가족의 사회적 지위를 높이고자 하는 가족과 그 구성원을 이해하는데 기여하기를 기대한다. The purpose of this study is to show the value of Seoul National University (SNU) to families with low socioeconomic status through the autoethnographic method. Families with low socio-economic status may have motive to overcome their difficulties through education (學歷). If there is an appropriate candidate for enrollment at SNU within the family, the family can achieve the goal by concentrating all resources on the designated family member. One family member, who is not well-differentiated, may sacrifice for the purpose in that process. The higher the degree of family fusion, the least well-differentiated person, who would often sacrifice in the family, is particularly vulnerable to live one`s own life. It would cause a family to be dysfunctional. Victim of dysfunctional relationships can suffer in the process of becoming independent. Even after successfully achieving independence, they can feel an inner emptiness. Although external fulfillment such as education (學歷) can only partially fulfill their needs, people will still need to come to terms a small and shabby inner-self that was formed in early life through an unhealthy environment. This study is expected to contribute to understanding the family and its members in the process of elevating the family`s social status through education (學歷).
김명찬(Myoung Chan Kim),채두병(Doo Byoung Chay),이상은(Sang Eun Lee),김종석(Jong Seok Kim),이윤호(Yoon Ho Lee) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.7
Varix of the intraabdominal portion of the fetal umbilical vein is a rare entity. We present a case of varix of the intrafetal umbilical vein diagnosed by routine prenatal ultrasonography at 35 weeks of gestation. Color Doppler examination of the abnormal umbilical vein demonstrated turbulent flow through 23-㎜ diameter cystic dilatation of the fetal intra-abdominal umbilical vein consistent with a varix. No other sonographic abnormalities were detected, and a healthy infant was delivered at term.
아세틸렌의 열 및 플라즈마 CVD법으로 제조한 탄소나노튜브의 물성과 구조적 특성
김명찬 ( Myung Chan Kim ),문승환 ( Seung Hwan Moon ),임재석 ( Jae Seok Lim ),함현식 ( Hyun Sik Hahm ),김명수 ( Myung Soo Kim ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.2
N/A Multi-walled carbon nanotubes (CNTs) were prepared by thermal chemical vapor deposition (CVD) and microwave plasma chemical vapor deposition (MPCVD) using various combination of binary catalysts with four transition metals such as Fe, Co, Cu, and Ni. In the preparation of CNTs from acetylene precursor by thermal CVD, the CNTs with very high yield of 43.6 % was produced over Fe-Co/Al₂O₃. The highest yield of CNTs was obtained with the catalyst reduced for 3 hr and the yield was decreased with increasing reduction time to 5 hr, due to the formation of FeAl₂O₄ metal-aluminate. On the other hand, the CNTs prepared by acethylene plasma CVD had more straight, smaller diameter, and larger aspect ratio(L/D) than those prepared by thermal CVD, although their yield had lower value of 27.7%. The degree of graphitization of CNTs measured by I_d/I_g value and thermal degradation temperature were 1.04 and 602t, respectively.