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정민서,황유식,장한별,이수언,박재홍 한국고분자학회 2014 Macromolecular Research Vol.22 No.1
For the final purpose of accelerating the restoration of defected bone tissue, researches for developing invitro three dimensional (3D) mineralized tissue using various stem cells, scaffolds and culture systems have beenextensively done. In this research, an integrated bioprocess to generate stem cell-based 3D mineralized construct wasdeveloped using adipose-derived stem cell (ADSC), highly porous biodegradable poly(D,L-lactide-co-glycolide)(PLGA) microspheres and a high-aspect ratio vessel (HARV) bioreactor system. First, ADSCs adhered uniformly onpoly-L-ornithine-coated macroporous PLGA microspheres, and the ADSC/microsphere composites were culturedin the presence of osteogenic supplements in a HARV bioreactor. Alkaline phosphatase (ALPase) activity assay,immunocytochemical staining and quantitative real-time polymerase chain reaction (qPCR) analysis showed temporalincrease of ALPase activity, molecular expressions of type I collagen, osteocalcin and runx2 and upregulationof runx2, Sp7, type I collagen and bone sialoprotein mRNA during 3D osteogenic culture of ADSC/microspherecomposites. Finally, 3D dynamic osteogenic culture generated highly mineralized micro tissues as validated byalizarin red-S staining and SEM-EDS. The results demonstrated that cell-based 3D micro-mineralized tissue couldbe generated by integrated bioprocess, and potentially utilized for bone tissue regeneration. The integrated bioprocessin this study may provide an efficient and scalable culture system for application in bone tissue engineering.
프로모션 효과에 영향을 미치는 요인: 프랜차이즈 외식 산업의 SNS 버즈 분석을 중심으로
정민서,이철진,윤지희,정윤혁,Jeong, Min-Seo,Lee, Cheol-Jin,Yoon, Ji-Hee,Jung, Yoonhyuk 한국빅데이터학회 2017 한국빅데이터학회 학회지 Vol.2 No.2
프랜차이즈 경쟁의 심화에 따라 기업은 프로모션에 상당한 재원을 투자하고 있으며, 이에 프로모션의 효과 측정의 필요성이 증가하고 있다. 본 연구는 프랜차이즈 외식 산업에서 이러한 프로모션의 효과를 조사하기 위해 대표적 소셜 네트워크 서비스인 트위터 데이터를 경험적으로 분석하였다. 먼저 프로모션의 간격과 기간, 그리고 계절이 프로모션의 효과에 영향을 미치는 요인임을 통계적으로 입증했고, 나아가 각 요인별로 프로모션의 효과에 영향을 미치는 배경을 파악하여 외식 산업 내 기업의 업종에 따른 프로모션 전략을 제안하였다. Companies has been investing enormous resources in promotion as the market keeps changing rapidly. Therefore, there are growing needs to measure the impact of a promotion on revenue growth. To investigate the effect of promotion in franchise food service industry, this study empirically analyzed text data from Twitter, one of the dominant social network services. Our findings show that a gap between promotions, promotion duration, and season have a significant influence on a volume of twitter buzz, which represents a promotion effect in our study. Next, we tried to analyze the reason why those factors were related to the promotion effect. Finally, we suggested promotion strategies related to each influential factor depending on types of business in food service industry.
정민서,조용남,Jung, Min Seo,Jo, Yong Nam 한국재료학회 2020 한국재료학회지 Vol.30 No.12
For zinc-air batteries, there are several limitations associated with zinc anodes. The self-discharge behavior of zinc-air batteries is a critical issue that is induced by corrosion reaction and hydrogen evolution reaction (HER) of zinc anodes. Aluminum and indium are effective additives for controlling the hydrogen evolution reaction as well as the corrosion reaction. To enhance the electrochemical performances of zinc-air batteries, mechanically alloyed Zn-Al and Zn-In materials with different compositions are successfully fabricated at 500rpm and 5h milling time. Investigated materials are characterized by X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM), and energy dispersive spectrometer (EDS). Alloys are investigated for the application as novel anodes in zinc-air batteries. Especially, the material with 3 wt% of indium (ZI3) delivers 445.37 mAh/g and 408.52 mAh/g of specific discharge capacity with 1 h and 6 h storage, respectively. Also, it shows 91.72 % capacity retention and has the lowest value of corrosion current density among attempted materials.
중학생들의 인터넷 중독 위험수준에 따른 신체활동량과 비만도의 관련성
정민기(Jeong, Min-Ki),김권민(Kim, Gwon-Min),권유찬(Kwon, Yoo-Chan) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.4
The purpose of this study was to examine the association perceived physical activity pattern and body mass index according to habitual internet usage among middle school student. Data were analyzed for 969 students who responded to self-reported base cross-sectional survey relating to socio-demographic variables, internet usage status, and a short version of the international physical activity questionnaire. Prevalence rate of physical activity status showed that 53.5% at 150 min/week under, 46.5% at 150min/week over. Prevalence rate of internet usage showed that 95.6% at normal group, 2.6% at potential group, 1,9% at addiction group. Prevalence rate of body mass index status of over weight according to internet usage status shoed that 83.1% at normal, 5.1% at potential, 11.9% at addiction. Prevalence rate of physical activity levels of 150 min/week under according to internet usage status showed that 93.8% at normal, 3.5% at potential, 2.7% at addiction. In comparison with the physical activity levels was significantly more likely potential internet usage (OR, 2.62; 95% confidence interval [95%CI], 1.09-6.47; p〈.05) and addiction usage (OR, 3.82; 95% confidence interval [95%CI], 1.24-11.75; p〈.05). The results revealed that physical activity levels and body mass index correlates of internet usage status. This finding suggest the necessity of developing specific strategies for physical activity intervention by internet addiction among middle school students.
The Existential Ego in the Space of the Others : Chinatown, Generic Renovation and Inheritance
정민아 동국대학교 영상미디어센터 2011 씨네포럼 Vol.0 No.12
In the present analysis of popular culture, Film Noir extremely attracts analysts. Film Noir flourished from the 1940s to the 1950s, and then rapidly declined. As many film historians agree, it began with The Malese Falcon(John Huston, 1941) and ended with Touch of Evil(Orson Welles,1958). But if the period of Classic Noir ended in 1958, the real revival of Noir was launched by Chinatown(Roman Polanski) in 1974. Chinatown is called film noir thriller, neo noir, gangster, or criminal mystery. The reason for its various names is due that it is a magnificent descendent from film noir. Despite its inheritance, Chinatown has clear distinctions from classic noir as a permutation. Apocalypse message in film noir and Polanski's perspective as a stranger are mixed in Chinatown, which becomes a treasure chest containing varicolored interpretations. Texts about film noir were dominated by common words such as the influence of German expressionism, a play of shadow and light,abnormal camera angles, flash back and voice-over, social depression after World War II and the instability of male identities. On the other side, in the case of the interpretation of Chinatown, there is a possibility of reading against grain. This film opened the period of new noir and functions as a text that permits pluralistic interpretations as well. As a result, the social implication of permutation genre film in the era of anti-war and minorities' movements commences with Chinatown. To analyze this film, first of all, this article will follow the problem of genre. The question of genre helps accepting the value of a film in the tradition of cinema or contemporary culture. Genre is the dynamic system that allows minimum changes in the structure of repetition. The term of minimum changes includes invention, auteur,tension and deviation. Chinatown belongs not only to Polanski but also to a group's effort including Hollywood that had to consider audience's desire in 1970s America. In particular, this article applies Rick Altman's genre approach to Chinatown. Genre's dynamic power can be proved through his methodology including theory and history. In supplement, the topic of auteur will be accepted for this analysis in that the place where genre stepped into authority and sincerity of cinema was through the very auteur. After that, genre criticism and auteur theories cooperate enthusiastically.