20㎿의 풍력발전단지의 실측 데이터 기반한 전력품질 분석 평가

김미현(Mihyun Kim),변길성(Gilsung Byeon),이한상(Hansang Lee),장길수(Gilsoo Jang),한운기(Woonki Han) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11

Wind power plants must provide the power quality required, similar to that provided by the conventional power plants, to ensure the stability and reliability of the power system it is connected to. Although many operational aspects affect wind power plant operation, this paper, we focus on power quality. Since a wind power plant is connected to the grid, it is very important to understand the sources of disturbances that affect the power quality. This paper performs power quality analysis based on actual data of wind power plants. Especially, it has analysed voltage variation, power factor, harmonics in comparison with distributed generation network interconnection technology standards. In this paper, when the power amount was below 2㎿, there was a deterioration in power quality for power factor, voltage variation and harmonics.

초등교사 간 비공식적 의사소통의 효과에 대한 연구

김미현 ( Kim Mihyun ) 한국초등교육학회 2020 초등교육연구 Vol.33 No.4

이 연구는 초등교사 간 비공식적 의사소통의 특성을 확인함과 동시에 교육 현장에 미치는 효과를 분석하는 것을 연구의 목적으로 하였다. 2019년 9월부터 2020년 2월까지 서울시 초등교사 55명을 대상으로 설문조사를 실시하고 그 중 주제보자를 선정하여 심층면담을 통해 자료를 수집하고 분석하였다. 그 결과, 초등교사 간 비공식적 의사소통의 특성은 내용 측면에서 주제의 다양성, 흐름 측면에서 교육으로의 회귀성, 결과 측면에서 현장으로의 연결성으로 나타났다. 초등교사 간 비공식적 의사소통의 긍정적 효과는 인지적, 정서적, 행동적 측면에서 다음과 같다. 먼저 인지적 측면의 효과로 초등교사는 비공식적 의사소통을 통해 지식과 기술을 공유한다. 특히 저경력교사는 적극적 수용자로 참여하여 괄목할만한 인지적 성장을 한다. 다음으로 정서적 측면의 효과로 초등교사는 공감을 통한 속풀이를 경험한다. 이와 더불어 경력교사는 연대를 위한 선순환적 책임감을 느낀다. 마지막으로 행동적 측면의 긍정적 효과로 초등교사는 유연한 태도를 습득하고, 경력교사는 타성에서 벗어나 기존의 지식과 기술을 재구조화한다. 초등교사 간 비공식적 의사소통의 부정적 효과는 정서적, 행동적 측면에서 갈등의 발생 및 불화의 계기 제공, 개인적 자원의 고갈, 스쳐가는 관계에 대한 경력교사의 회의감 누적, 막내역할의 기대로 인해 저경력교사에게 가중되는 부담감이 있다. The goal of this research is to determine the characteristics of informal communication among elementary school teachers and their impact on education. Data was collected through a survey of 55 elementary school teachers in Seoul conducted from September 2019 to February 2020 as well as in-depth interviews with selected elementary school teachers. The analysis of this data showed that informal communication among the teachers was characterized by the diversity of subject, tendency to converge into the subject of education, and connection with their teaching practices. The positive impact of informal communication among the teachers was identified as follows. In terms of cognitive aspect, first, the teachers shared knowledge and skills through informal communication with their colleagues. Less experienced teachers, in particular, tended to eagerly receive the knowledge shared and often experience remarkable cognitive growth as a result. Second, informal communication served as a channel for the teachers to release their emotional baggage and receive empathy from their peers. Meanwhile, more experienced teachers reported a sense of responsibility for maintaining a virtuous cycle of solidarity with other teachers. As to behavioral aspect, last, informal communication promoted flexible attitudes among the teachers and for experienced teachers, served as a way to overcome complacency and renew their knowledge and skills. In emotional and behavioral aspect, the downside of informal communication included potential to lead into a conflict, depletion of personal resources, accumulated fatigue of experienced teacher from one-off interactions, and the sense of burden felt by younger less-experienced teachers as they are expected to serve older teachers.

산업기술 분류체계 개발에 관한 연구 –반도체 제조용 장비를 중심으로

김미현(Mihyun Kim),윤성필(Seong-Pil Yoon),김영준(YoungJun Kim) 한국기술혁신학회 2019 한국기술혁신학회 학술대회 발표논문집 Vol.2019 No.11

신기술의 등장과 기술 간 융합 등 산업기술의 변화가 매우 빠르게 전개되고 있다. 산업기술은 정책 수립 시 산업적 접근과 함께 기술적 접근이 이루어져야 하나 기존 분류체계는 산업기술 동향을 적시에 반영하기에 부족한 한계가 있다. 산업기술 현장에서 주로 활용하는 분류체계는 산업통계 생성을 위한 표준산업분류, 무역통계 생성을 위한 HS분류 및 MTI 분류, 기술분류를 위한 국가과학기술표준분류 등이 있다. 그러나 각각의 분류체계가 상이한 목적에 따라 수립되어 산업기술 정책에 활용하기 위해 통합적인 검토를 수행하는 데는 어려움이 있다. 일례로 최근 한일 무역 마찰과 같이 특정 품목의 기술적 우위가 전략적 무기로 활용되는 상황에서 기존 분류체계로는 대응 방안 마련을 위한 신속한 분석을 수행하기 어렵다. 본 연구에서는 기존 분류체계의 현황 및 한계점을 살펴보고 각 분류체계를 상호 연계할 수 있는 산업기술 분류체계를 반도체 제조용 장비를 중심으로 제시하고자 한다.

초등학생의 부모와의 의사소통, 주관적 행복감, 게임중독 간의 구조관계

김미현(Kim, Mihyun),곽현석(Kwak, Hyunseok) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.15

본 연구는 초등학교 고학년 학생의 부모와의 의사소통, 게임중독 간의 관계에서 주관적 행복감의 매개효과를 살펴보는 데 주된 목적이 있다. 이를 위하여 한국방정환재단에서 주관하고 한국조사연구학회(The Korean Association for Survey Research, KASR)에서 제공하는 2018년 제10차 한국 어린이-청소년 행복지수 데이터를 사용하였다. 연구대상은 초등학생 4, 5, 6학년 2,201명이다. 연구척도로 부모와의 의사소통, 주관적 행복감, 게임중독 척도를 사용하였다. 주관적 행복감의 매개효과를 알아보기 위해 구조방정식 모형을 사용하여 분석하였다. 연구 결과는 첫째, 부모와의 의사소통은 주관적 행복감을 매개할 경우, 게임중독에 통계적으로 유의미한 직접효과를 가지지 않는다. 둘째, 부모와의 의사소통과 게임중독의 관계에서 주관적 행복감은 통계적으로 유의한 매개효과가 있는 것으로 나타났다. 본 연구를 통한 교육적 시사점은 첫째, 게임중독을 완화시키기 위해서는 부모-자녀 간 의사소통에 관한 학부모교육을 활성화시켜야 한다. 둘째, 게임중독치료를 위한 상담과정에서 상담자가 활용할 수 있는 새로운 자원으로서 주관적 행복감을 제안한다. This study examined the mediating effects of subjective happiness between communication with parents and game addiction. The study relied on data from the 10th Korea Child-Youth Happiness Index data of 2018 provided by the Korea Association for Survey Research(KASR). The subjects were 2,201 elementary school students in grades 4, 5, and 6. We used communication scale, subjective well-being scale and game addiction scale. We established structural equation models(SEM) to investigate the mediating effects of subjective well-being. From this experiment, there is no statistical direct effect between game addiction and communication with parents when mediated by subjective happiness. Interestingly, subjective happiness has a statistically significant mediating effect on communication with parents and game addiction. The practical implications are as follows: First, parents education about parent-child communication should be activated. Second, we suggest subjective happiness as a new resource that counselors can use in counseling process for game addiction treatment.

Co-word 분석법을 통한 디지털금융 연구의 프레임워크 도출

김미현(Mihyun Kim),함유근(Yukun Hahm),이우형(Woohyoung Lee),김용재(Yongjae Kim) 한국인터넷전자상거래학회 2011 인터넷전자상거래연구 Vol.11 No.1

The evolution of information and communication technology is continued, and, financial services are becoming more dependent on digitalized information and tools. Simply speaking, digital finance refers to developing and delivering financial services digitally. However, the research scope of digital finance is still at a young age. This empirical research demonstrates the effectiveness of content analysis to map the research literature of the digital finance to identify the boundaries of digital finance research. Co-word analysis is the specific technique used. This methodology identifies associations among publication descriptors (indexing terms) from the Social Sciences Citation Index(SSCI) and produces networks of descriptors that reveal these underlying patterns. The results suggest six research themes in digital finance as new technologies emerge and customers’ experience on digital financial services grow.

교육 과정 개선을 위한 국내 패션일러스트레이션 교재 콘텐츠 연구

김미현(Mihyun Kim) 한국복식학회 2015 服飾 Vol.65 No.5

This study examines the fashion illustrations textbooks that have been published in the domestic market, and identifies its characteristics and problems in regards to its use in developing creative students. The purpose of the study is to propose ways to improve the development of the fashion illustration textbooks. The research method of this study are as follows: First, the teaching materials on fashion illustration in Korea were researched to examine the current state of publication. Second, its contents were analyzed to identify its characteristics. Third, an improvement plan of educational materials on fashion illustration in Korea were proposed. As for the scope of study, 18 volumes of fashion illustration teaching materials published in Korea during 2004-2014 were targeted. It should be noted that translated publications, digital fashion illustration materials and teaching materials for specialized and professional organizations were excluded. Conclusions of this study are as follows: First, examination of the textbooks revealed that additional content is needed regarding theoretical understanding of fashion illustration, as well as illustrations of men and children, as there was an insufficient amount of those topics. Second, the contents on the illustration application using current trends were lacking in the unit on illustration application. Accordingly, it is necessary to develop contents that reflect these trends. Lastly, the textbooks should be packaged with compact discs CDs containing video clips to assist students to get a better grasp of the material. The result of this study can be used to develop new teaching materials on fashion illustration, and be utilized as basic information in the curriculum design of fashion illustration.

Salmonella gallinarum에 대한 specific IgY의 항균력

김미현(Mihyun Kim),노정해(Jeonghae Rho),김영붕(Young Boong Kim),손동화(Dong Hwa Shon),정순희(Soon Hee Jung) 한국식품과학회 2007 한국식품과학회지 Vol.39 No.5

Salmonella gallinarum로 면역화된 산란계로부터 생산된 계란 난황 중에 들어 있는 anti-S. gallinarum specific IgY를 분리하여 IgY의 효능을 살펴보았다. 또한 면역화 여부, specific IgY 농도별 및 균수별에 따른 항균력을 현미경적 관찰 및 탁도 측정, pH변화로 검토하였다. 전체 IgY 중 anti-S. gallinarum IgY의 특이항체의 비율은 23%로 나타났다. 또한 anti-S. gallinarum IgY와 Salmonella 유사 균주의 항원에 대한 IgY의 선택성을 조사한 결과 생산된 IgY는 S. gallinarum 에만 선택성을 갖는 것으로 나타났다. S. gallinarum 배양액에 anti-S. gallinarum specific IgY0.3%를 첨가한 처리구는 상등액과 침전물에서 S. gallinarum가 응집되는 현상을 보였다. 그러나 면역을 하지 않은 닭에서 생산된 계란으로부터 추출한 IgY와 대조구에서는 응집 반응이 일어나지 않았다. Anti-S. gallinarum IgY를 첨가한 처리구가 대조구보다 S.gallinarum균들이 응집되는 정도에 있어서 확실한 효과를 나타내었다. 현미경 관찰시 균체들의 응집현상은 IgY 0.2% 이상 첨가시에 나타났으며, pH와 탁도에 있어서는 IgY 0.1% 이상 첨가구에서 S. gallinarum 성장 억제의 탁월한 효과를 볼 수 있었다. 10<suf>5</suf>CFU/mL에 Anti-S. gallinarum IgY 0.3%를 첨가한 처리구는 10<suf>3</suf> CFU/mL와 거의 동일한 탁도를 나타내어 IgY에 의한 성장 억제를 확인할 수 있었다. 현미경적 관찰에서 IgY 첨가량이 증가할수록 더 큰 균괴를 형성하는 것을 볼 수 있었다. 위의 결과들을 통해 S. gallinarum로 면역화된 닭으로부터 생산된 계란에서 추출된 IgY를 사용하면 가금티푸스를 예방하는데 이용될 수 있을 가능성을 보여주었다. In this study, we investigated the antimicrobial effects of anti-Salmonella gallinarum-specific IgY separated from egg yolk obtained from layers immunized by S. gallinarum. The comparison tests of vaccination, content of IgY, and innoculation number were examined by microscopic observation, turbidity, and pH. The results show that the ratio of anti- S. gallinarum IgY in the total IgY was 23%. Also, the anti-S. gallinarum IgY had selectivity only to S. gallinarum. The 0.3% addition of anti-S. gallinarum-specific IgY resulted in agglutinating clusters of S. gallinarum cells, but the agglomeration didn't occur in IgY from layers not immunized nor in the control group. Microscopic observation indicated agglomerative cells when IgY was added at 0.2% or higher, and the pH and turbidity examinations revealed that a suppression effect was remarkable in IgY at more than 0.1%. These results suggest the possibility that IgY extracted from eggs and obtained from layers immunized by S. gallinarum can be used to prevent fowl typhoid.

PSCAD/EMTDC를 이용한 실제 풍력발전 고조파 데이터 분석 모듈 개발

김미현(Mihyun Kim),변길성(Gilsung Byeon),장길수(Gilsoo Jang),한운기(Woonki Han) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11

The development and installation of high-capacity wind generation system to supply a large amount of required electricity to the connected power system have become a new trend in recent years. Accordingly, the increase in the utilization of wind power generation system has had an important influence on power quality. Therefore, wind power generation system must maintain the power quality similar to that of the conventional power plants, to ensure the stability and reliability of the power system it is connected to. Also, it is very important to understand the sources of disturbances that affect the power quality. In this paper, in order to observe the effect of harmonics depending on the proportion of wind power supply against the power supply from KEPCO, simulations were executed in PSCAD/EMTDC. one of the power system analysis programs.

풍력발전단지의 실 데이터를 기반으로 한 플리커 분석

김미현(Mihyun Kim),변길성(Gilsung Byeon),장길수(Gilsoo Jang),한운기(Woonki Han),안재민(Jaemin Ahn) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

The development and installation of high-capacity wind generation system to supply a large amount of required electricity to the connected power system have become a new trend in recent years. In this respect, the increasing use of wind power generation system has had an important influence on power quality. Therefore, wind power generation system must maintain the power quality similar to that of the conventional power plants, to ensure the stability and reliability of the power system it is connected to. Also it is very important to understand the sources of disturbances that affect the power quality. In this paper, flicker analysis based on actual wind turbine measurement data is performed especially. To ensure its validation, real-time measurement data is utilized. And power quality measurement and assessment require that wind turbines connected to the power distribution grid are compatible with the interconnection standard for distributed generation presented by Korea Electrical Power Corporation (KEPCO).

시뮬레이션에 의한 허베이스피리트호-삼성바지선 충돌사고 분석

김선영(Sun Young Kim),이경중(Gyeong-Joong Lee),박세길(Sekil Park),김연규(Yeon Gyu Kim),이문진(Moonjin Lee),손남선(Nam-Sun Son),공인영(In-Young Gong),김미현(Mihyun Kim) 한국항해항만학회 2011 한국항해항만학회 학술대회논문집 Vol.2011 No.춘계

On 7 December 2007, the Hebei Spirit, a 260,000 dwt VLCC, anchored near Korea's Daesan Port, was collided with a passing crane-carrying barge Samsung1, which was under tow of two tugs Samsung T5 and Samho T3. In this study, the behaviour of Hebei Spirit at the time of the accident has been reproduced and analyzed by simulation. This study precedes the study for the investigation of any available countermeasures for Hebei Spirit to prevent the accident. The simulation has been done only for Hebei Spiri and the motion of Samsung barge is just given with recorded AIS data. Dynamic characteristics of Hebei Spirit have been modeled based on empirical data and her sea trial data. Effects of current, wave and wind are also estimateed using empirical formula. Considering uncertainty of environmental condition and control of Hebei Spirit, simulation has been done by varying engine control method and holding power coefficients of the anchor. Finally, based on simulations, the most plausible scenario on the state of anchor and engine control could cause real accidents.