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      • KCI등재

        마이크로데이터 공표를 위한 통계적 노출제어 방법론 고찰

        박민정,김항준,Park, Min-Jeong,Kim, Hang J. 한국통계학회 2016 응용통계연구 Vol.29 No.6

        학술 연구나 정책 입안 등을 위한 심층적 자료 활용의 확대는 동시에 개별 정보 노출에 대한 염려도 증가시킨다. 때문에 최근 이십여 년 간 통계적 노출제어(정보보호) 분야에서 많은 논문들이 발표되었다. 본 논문은 그러한 연구 내용들을 정리하여 국내 통계인들과 기관들에게 소개하고자 한다. 주요 내용으로 국소통합이나 잡음추가와 같은 전통적인 매스킹 기법 뿐만 아니라, 온라인 자료 분석 시스템에서의 정보보호 처리, 차등정보보호를 통한 노출제어 및 재현자료를 활용한 정보보호 대안 모색에 대해 다룬다. 또한 각각의 주제에 대한 방법론 소개와 함께 활용 사례 및 장단점을 논의하였다. 본 논문이 실제적인 통계적 노출제어 문제를 고민하는 통계인들에게 도움이 되기를 바란다. The increasing demand from researchers and policy makers for microdata has also increased related privacy and security concerns. During the past two decades, a large volume of literature on statistical disclosure control (SDC) has been published in international journals. This review paper introduces relatively recent SDC approaches to the communities of Korean statisticians and statistical agencies. In addition to the traditional masking techniques (such as microaggregation and noise addition), we introduce an online analytic system, differential privacy, and synthetic data. For each approach, the application example (with pros and cons, as well as methodology) is highlighted, so that the paper can assist statical agencies that seek a practical SDC approach.

      • KCI등재

        순환성분 추출을 위한 EMD와 HP 필터의 비교분석: 한국의 거시 경제 지표에의 응용

        박민정,성병찬,Park, Minjeong,Seong, Byeongchan 한국통계학회 2014 응용통계연구 Vol.27 No.3

        본 논문에서는 시간-진동수 영역에서 시계열을 여러 구성 성분으로 분해하는 방법인 경험적모드분해법(Empirical Mode Decomposition)을 소개하고, 이를 이용하여 한국의 주요 거시 경제 지표를 대상으로 순환변동과 추세 성분을 추출하고 예측에 활용한다. 그 효율성을 살펴보기 위하여, 추출된 구성 성분들의 변동성, 동행성, 지속성, 인과성, 비정상성 및 예측력을 계산하고, 가장 보편적으로 널리 사용되고 있는 Hodrick-Prescott 필터에 의한 결과와 비교한다. We introduce the empirical model decomposition (EMD) to decompose a time series into a set of components in the time-frequency domain. By using EMD, we also extract cycle and trend components from major Korean macroeconomic indices and forecast the indices with the components combined. In order to evaluate their efficiencies, we investigate volatility, autocorrelation, persistence, Granger causality, nonstationarity, and forecasting performance. They are then compared with those by Hodrick-Prescott filter which is the most commonly used method.

      • KCI등재

        다문화가정 유아의 교육기관 적응과정과 상호작용 행동유형에 관한 근거이론적 접근

        박민정,이병인 한국특수교육학회 2010 특수교육학연구 Vol.45 No.1

        The purpose of this study is to explore the adaptational process and interaction-behavioral types of young children with multi-cultural families. The research design consisted of conducting participant non-observation of multi-cultural children at preschool and individual interview sessions with teachers who are in charge of them. Collected data were analyzed through grounded theory approach of Strauss and Corbin(1990). This study revealed four important findings. First, most young children with multi-cultural families had relative difficulties in linguistic, social, emotional and cognitive development. Second, they experienced ‘experiencing difficulty in adapting to preschool’ phenomenon by causal conditions of ‘the Korean language ability of mothers’ and ‘foster parent’s attitude’. And contextual conditions were ‘lack of quality educational circumstance’ and ‘lack of community connections’. And intervening conditions were ‘teachers and peer supports’ and ‘language ability of young children with multi-cultural families’. Third, coping strategies among young children with multi-cultural families to adjust to a preschool were like the followings: ‘reading facial expression’, ‘enduring unconditionally’, ‘imitates’, and ‘trying to work get along with other children’. These coping efforts caused ‘psychological anxiety’, ‘adaptation effort’ and ‘limited relationships’. Fourth, interaction patterns of young children with multi-cultural families could be defined as ‘type of environmental search’, ‘type of imitation’, ‘type of attention’ and ‘type of force use’. Finally, this study presented the necessity of the instruction on appropriate communication and social skills for young children with multi-cultural families. The findings in this study can be used as the ground knowledge in order to set the right direction for providing comprehensive family supports and in particular, educational supports for young children with multi-cultural families. 본 연구에서는 다문화가정 유아의 교육기관 적응과정과 상호작용 행동유형에 대하여 고찰하였다. 이를 위하여 다문화가정 유아들을 지도하고 있는 교사와의 심층 면담과 다문화가정 유아를 대상으로 비 참여 관찰을 실시하였으며, Strauss와 Corbin(1990)의 근거이론의 방법으로 분석하였다. 본 연구 결과는 다음과 같다. 첫째, 다문화가정 유아들은 ‘유치원 적응에 어려움’이라는 중심현상 안에서 ‘교수-활동 참여의 어려움’과 ‘놀이 활동 참여의 어려움’을 경험하였으며, 이러한 현상의 인과적 조건으로는 ‘어머니의 한국어 능력’과 ‘부모의 양육태도’로 나타났다. 둘째, 중심현상에 대한 맥락적 조건으로 ‘다문화가정 교육여건의 미비’와 ‘가정의 어려움과 지역사회와의 연계 부족’을 나타내었으며, 중재적 조건으로는 ‘교사와 또래의 지원’과 ‘유아의 언어능력’으로 나타났다. 셋째, 중심현상에 대하여 다문화가정 유아가 주변세계와 상호작용하며 대처할 작용/상호작용은 눈치보기‘, ’무조건 참기‘, 모방하기’, ‘또래와 어울리려는 시도하기’, ‘힘을 사용하기’의 전략으로 나타났으며, 작용/상호작용에 따른 결과로서 ‘심리적 불안’, ‘적응노력’, ‘제한된 관계’를 나타내었다. 이와 더불어 다문화가정 유아의 상호작용 행동유형으로는 ‘주변탐색형’, ‘모방하기형’, ‘관심끌기형’, ‘무력사용형’으로 나타났다. 따라서 본 연구는 다문화가정 유아의 상호작용 행동유형을 밝혀줌으로써 교육기관에서의 바람직한 의사소통 및 사회적 기술을 습득하기 위한 중재프로그램 개발은 물론 다문화가정 유아의 교육과 이들을 위한 가족지원 방법을 모색하는데 도움이 될 것이다.

      • KCI등재

        Effect of dentin treatment on proliferation and differentiation of human dental pulp stem cells

        박민정,방난심,정일영 대한치과보존학회 2015 Restorative Dentistry & Endodontics Vol.40 No.4

        Objectives: Sodium hypochlorite (NaOCl) is an excellent bactericidal agent, but it is detrimental to stem cell survival, whereas intracanal medicaments such as calcium hydroxide (Ca[OH]2) promote the survival and proliferation of stem cells. This study evaluated the effect of sequential NaOCl and Ca(OH)2 application on the attachment and differentiation of dental pulp stem cells (DPSCs). Materials and Methods: DPSCs were obtained from human third molars. All dentin specimens were treated with 5.25% NaOCl for 30 min. DPSCs were seeded on the dentin specimens and processed with additional 1 mg/mL Ca(OH)2, 17% ethylenediaminetetraacetic acid (EDTA) treatment, file instrumentation, or a combination of these methods. After 7 day of culture, we examined DPSC morphology using scanning electron microscopy and determined the cell survival rate with 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. We measured cell adhesion gene expression levels after 4 day of culture and odontogenic differentiation gene expression levels after 4 wk using quantitative real-time polymerase chain reaction. Results: DPSCs did not attach to the dentin in the NaOCl-treated group. The gene expression levels of fibronectin-1 and secreted phosphoprotein-1 gene in both the Ca(OH)2- and the EDTA-treated groups were significantly higher than those in the other groups. All Ca(OH)2-treated groups showed higher expression levels of dentin matrix protein-1 than that of the control. The dentin sialophosphoprotein level was significantly higher in the groups treated with both Ca(OH)2 and EDTA. Conclusions: The application of Ca(OH)2 and additional treatment such as EDTA or instrumentation promoted the attachment and differentiation of DPSCs after NaOCl treatment.

      • KCI등재

        일개 대학 신입생들의 학습행태, 전공만족도, 학습기술의 관계

        박민정 한국의학교육학회 2011 Korean journal of medical education Vol.23 No.2

        Purpose: This study aims at increasing our understanding of first-year medical students' learning behaviors, major satisfaction, and study skills. We investigate different features of freshmen's behavior in relation to learning and explore the extent to which freshmen were satisfied with their major and perceived their study skills. Methods: A total of 106 freshmen participated in this study. At midyear, first-year medical students were asked to complete a questionnaire that included the learning behaviors, major satisfaction, and study skills. The data collected from the survey were analyzed using t-test, ANOVA, chi-square test, correlation analysis, and multiple regression analysis. Results: The study reported that most of freshmen had a lot of difficulties in studying at medical school by lack of prior learning. Despite first-year students, they were studying hard their major. Freshmen spent studying an average of 1 hour or less than 2 hours every day. The study also indicated that of major satisfaction, the overall satisfaction of the department was the highest and the satisfaction in learning environment was the lowest. There were significant differences among the freshmen on the major satisfaction due to admission process, academic performance, and housing type. Of 11 study skills, while freshman highly perceived their teamwork, stress management, and reading skills, their weak study skills identified in this study were writing, note taking, time management, and test taking skills. There were significant differences among the freshmen on the study skills due to gender and academic performance. Finally, freshmen's learning behaviors and major satisfaction were significantly associated with some of study skills. Conclusion: This study may have implications for the academic adjustment and learning processes in the first year. We need to consider variables such as learning behaviors, major satisfaction, and study skills, when discussing about how to maximize the learning potential of medical students. It is also important that we develop education program so that all students acquire these necessary skills and continue to improve positive behaviors related to learning.

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