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Three-dimensional numerical simulation for resin transfer molding of automotive wheel
황정민,이소윤,김형민,윤재륜,송영석 한국유변학회 2019 Korea-Australia rheology journal Vol.31 No.3
Resin transfer molding (RTM) is a manufacturing process that uses liquid resin to saturate a fiber preform placed in a closed mold cavity. For robust fabrication of the composite, fiber preform needs to be completely impregnated with polymer resin during mold filling. Hence, the understanding of resin flow and void formation in RTM is very important to design the mold and processing conditions for successful production of composite parts. In this study, three-dimensional (3D) numerical simulation was carried out to investigate the resin flow behavior in a complicated mold. An automotive wheel rim was designed and fabricated using carbon fiber preform and epoxy resin. Case studies were performed to minimize the void formation during processing.
부자가족 아버지의 자녀애착, 양성평등의식, 사회적지지와 회복탄력성의 관계 연구
황정민,김혜선 한국통합사례관리학회 2019 한국케어매니지먼트연구 Vol.0 No.31
본 연구는 부자가족 아버지의 자녀애착, 양성평등의식, 사회적 지지와 회복탄력성과의 관계를 탐색해보고 사회복지서비스 제공을 위한 자료를 얻고자 실시되었다. 자료조사는 강원도지역을 중심으로 사회복지서비스를 받고 있는 부자가족 아버지를 대상으로 2016년 10월에서 11월에 자기보고식 설문지를 사용하여 실시하였다. 수거된 설문지는 105부였으나 불명확한 설문지를 제외한 최종 97부를 SPSS 18의 통계프로그램으로 분석하였다. 연구결과 부자가족 아버지의 회복탄력성과 자녀애착, 양성평등의식, 사회적 지지는 상호관련성이 있었다. 또한 회복탄력성에 양성평등의식이 가장 높은 설명력을 보였고, 자녀애착, 사회적지지, 종교도 영향력을 보였다. 이러한 결과를 토대로 부자가족 아버지에 대한 프로그램의 방향, 사회복지사의 역할, 사회적 네트워크에 기반한 접근성 강화 등을 제안하였다.
데이터마이닝 기법을 이용한 문헌정보학 전문용어 클러스터링 모델의 데이터베이스 설계에 관한 연구
황정민,박미영,승현우 서울여자대학교 자연과학연구소 2002 자연과학연구논문집 Vol.14 No.-
Data mining, a relatively new technique which has been evolved from the field of the computer and information science, involves searching for patterns in data. Similarly, text mining involves searching for patterns in text. It may be defined as the process of analyzing text to extract information useful for a particular purpose. Text is relatively unstructured, amorphous and difficult to deal with, compared with other types of data stored in databases. The number of terminologies extracted from unstructured text documents is irregular and the terminologies themselves are general in nature, making it difficult to retrieve useful information as efficiently as using algorithms searching for general association rules. In this paper, we propose a database design method for the terminology clustering model in which a datamining technique is used in order to extract useful information from large documents. The proposed method can be used in various areas including automatic document classification and intelligent search engines.
USN을 이용한 환경 모니터링 및 진단 시스템의 아키텍처 연구
황정민,윤주성,이민철,서석환,이창민 한국경영과학회 2009 한국경영과학회 학술대회논문집 Vol.2009 No.5
온실 효과, 해수면 상승, 기후 변화 등 주요 환경 문제가 대두되고 전세계적으로 환경 지침 및 환경 규제가 강화됨에 따라 환경 문제에 대한 관심이 점차 증대되고 있다. 이에 따라 산업 현장에서는 환경 지침 및 환경 규제에 대응하고 오염 물질 배출 최소화를 위한 환경 모니터링 시스템의 필요성이 부각되고 있으나, 아직 많은 산업 현장에서는 형식에 치우치거나 기술적으로 부족한 실정이다. 특히, 기존의 환경 모니터링 시스템은 환경오염 배출 물질 초과 발생에 대한 원인 분석 능력이 부족하고 배출 초과에 대해 작업자들이 대응하기 어려운 한계점을 지니고 있다. 이에, 본 연구에서는 환경오염 물질 배출을 저감하기 위하여, USN (Ubiquitous Sensor Network) 기술을 통해 실시간으로 공장 내 환경 이상 상황을 인지하고 원인을 분석하여 해당조치를 작업자에게 지원하는 시스템을 제안한다. 구체적으로, 1) 시스템 아키텍처를 설계하고, 2) 이상 상황 인지 및 원인 분석을 위한 규칙 및 사례 기반 방법론을 제시하며, 3) 사례 연구와 프로토타입 구현을 통해 제안된 시스템의 효과를 분석한다.
Anti-oxidant and Anti-inflammatory Properties of Methanol Extracts from Various Crops
황정민,최기춘,방성준,손영옥,김범태,Dong-Hern Kim,최기준,김다혜,Xianglin Shi,이정채 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.suppl1
Corn, sorghum, barley, Italian ryegrass (IRG),and alfalfa have long been used in human and/or animal diets. While their nutritional information is widely available,their potentials for anti-oxidation, anti-inflammation, and anti-tumor are barely explored. In the present study, several serial extracts were prepared from 70% methanol extracts of these forage crops and their bioactive potentials were investigated using cell-free and cell-mediated experimental systems. Chloroform extracts in this study generally showed stronger activity to scavenge hydroxyl radicals and superoxide anions than butanol or water extracts. IRG and sorghum chloroform extracts especially almost completely suppressed the lipopolysaccharide-mediated production of nitric oxide,tumor-necrosis factor-α, and interleukin-6. These extracts also inhibited dramatically the viability and DNA synthesis of human skin dermatofibrosarcoma cells without a toxic effect on primary cultured control cells. These beneficial effects appeared to be associated with the amount of flavonoids contained in the extracts.
황정민,승현우 서울여자대학교 자연과학연구소 2001 자연과학연구논문집 Vol.13 No.-
The world film industry, mainly led by the Hollywood, has been growing enormously for decades. The film industry in Korea is also at the height of its prosperity, owing to a series of recent box-office successes of blockbuster movies. Film producing or distributing companies in Korea are now investing an enormous amount of money fot eh film marketing. In order for them to capture movie-goers current interests rapidly and correctly, establish appropriate marketing strategies, and eventually succeed in the marketing, a new information infrastructure is needed. On the other hand, the data mining technology has been emerging and used in many application areas such as the decision support system, which helps find the unknown knowledge or regular patterns hidden in the database. In this paper, we design a data warehouse for the film information system which is known to be a good structure for data mining, and apply a various data mining techniques to the system.
黃正民 圓光大學校 醫科學硏究所 1985 圓光醫科學 Vol.1 No.1
In order to study the effect of administration of Panax ginseng on the positive Gz tolerance and on the changes of heart rate and ECG at human centrifuge, author selected 125 healthy young ROK airforce men who had never been exposed to human centrifuge and divided in five groups each. None was administered to group Ⅰ( control group ), group Ⅱ was placebo group. Red ginseng was administered to group Ⅲ, Ⅳ and Ⅴ with dairy dosage of 3,5 and 7 grams respectively for three months. All subjects were exposed to rapid onset run (ROR) which acceleration rate was 0.74G/sec. The stepwise increased positive acceleration profile of human centrifuge was stepwise running from 3 + Gz to the tolerable high + Gz (7 + Gz). The increase 1 + Gz was followed by every success of 15 sec. running of +Gz. The human centrifuge running was stopped at the sign of black out phenomenon of subject. The changes of heart rates and ECG were checked to evaluate the cardiovascular effect of positive acceleration with physiograph. The results were as follows : 1. The positive Gz tolerance was increased in group Ⅳ after three months administration and in group Ⅴ after two months administration compared with their initial values, and it was statistically significant. 2. The heart rate just after exposure to positive Gz tolerance was decreased significantly in group Ⅳ after two months administration and in group Ⅴafter one month administration compared with their initial values. 3. No difference was observed on ECG alteration in all groups compared with control group. 4. It was recommended that the ideal dosage of red ginseng for increment of positive Gz tolerance is about seven grams a day for two to three months.