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Comparison of Neural Network Techniques for Text Data Analysis
Munhee Kim,Kee-Hoon Kang 국제문화기술진흥원 2020 International Journal of Advanced Culture Technolo Vol.8 No.2
Generally, sequential data refers to data having continuity. Text data, which is a representative type of unstructured data, is also sequential data in that it is necessary to know the meaning of the preceding word in order to know the meaning of the following word or context. So far, many techniques for analyzing sequential data such as text data have been proposed. In this paper, four methods of 1d-CNN, LSTM, BiLSTM, and CLSTM are introduced, focusing on neural network techniques. In addition, by using this, IMDb movie review data was classified into two classes to compare the performance of the techniques in terms of accuracy and analysis time.
( Jiyoun Kim ),( Eunsurk Yi ),( Munhee Kim ),( Ahra Oh ),( Jongseob Shin ),( Namyoung Kim ) 융합연구학회 2020 융합연구학회지 Vol.4 No.2
Since 2015, Korea has been operating regional sports science centers in 10 cities across the country, and is pursuing a plan to systematically link athletes’ physical fitness through physical fitness measurements according to the athlete’s life cycle. For 243 elite athletes whose physical strength was measured by the Seoul Sports Science Center, the development direction of each sport type of the elite athletes in Seoul is analyzed through classification and grade. As a result of the study, in terms of basic physical strength, the difference in physical strength by sport type was significant in all items of muscle strength, muscular endurance, muscle power, cardiopulmonary endurance, agility, balance, and coordination except flexibility. As a result of analyzing the difference in the level of the physical strength factor according to the application of the fitness grade criteria for each sport type, the A type showed significantly higher differences in grip strength and back strength than the B and D types. It was significantly higher in sit-up than type A. Type B showed significantly higher physical endurance, muscle power, cardiopulmonary endurance, agility, coordination, and equilibrium compared to the A and D types, and D type showed higher physical strength level than the A type in cardiopulmonary endurance, agility, and balance. Based on the results of this study, it is considered necessary to compare the performance and physical strength of male high school students in Seoul and the characteristics of athletes by sport type to review the training method and improvement of the performance.
석탄 연료변경에 의한 몽골 게르 내 미세먼지와 일산화탄소 농도 변화
송승환(Seungwhan Song),Altangerel Bataa,김동현(Donghyeon Kim),김문희(Munhee Kim),김민정(Minjung Kim),이나현(Nahyun Lee),이미래(Mirae Lee),전슬기(Seulki Jeon),채희연(Heeyeon Chae),정현희(Hyunhee Jeong),Delgerzul Lodoisamba,Davaa 서울대학교 보건환경연구소 2020 보건학논집 Vol.57 No.2
Objectives: In the ger district of Ulaanbaatar, raw coal was used as fuel for heating and cooking. In May 2019, the Mongolian government replaced raw coal with processed coal to improve air quality. The aim of this study was to determine difference of PM<SUB>2.5</SUB> and CO concentrations in gers using raw coal and processed coal. Methods: In 48 gers, PM<SUB>2.5</SUB> and CO concentrations was measured during daytime using a real-time monitor. Behavioral factors were observed during the measurement. Surveys were conducted on residents' indoor air quality satisfaction and coal replacement time. The measured PM<SUB>2.5</SUB> concentrations was compared with the PM<SUB>2.5</SUB> concentrations using raw coal in the past. Multiple regression analysis was conducted to identify the factors expected to affect PM<SUB>2.5</SUB> when replaced with processed coal. Situational factors identified in cases of CO concentrations higher than 10 ppm were determined. Results: The average concentrations of PM<SUB>2.5</SUB> and CO in gers with processed coal were 41.2±25.7 μg/m³ and 2.0±1.3 ppm, respectively. The indoor PM<SUB>2.5</SUB> concentrations with processed coal was significantly lower than the level with raw coal. The important factors affecting indoor PM<SUB>2.5</SUB> concentrations were using candle, smoking, adding fuel, cooking, and ventilation. The CO concentrations was generally low. High peak CO concentrations were observed with the stove opening and cooking using gas. Conclusion: Indoor PM<SUB>2.5</SUB> concentrations in ger was significantly reduced by use of processed coal. Factors affecting indoor PM<SUB>2.5</SUB> concentrations such as using candle, smoking, adding fuel were similar to those identified in gers with raw coal. The CO concentrations in gers was low level without human health effects, however inappropriate operation could cause high CO level and adverse health effects.
사실적인 연기 시뮬레이션을 위한 이류항 계산의 수치적 개선
장문희(MunHee Chang),박수완(SuWan Park),김은주(Eunju Kim),유관우(KwanWoo Ryu) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2A
자연 현상에서 나타나는 연기나 난류의 움직임을 사실적으로 시뮬레이션을 할 때 Navier-Stokes 방정식을 이용한다. 이 방정식을 이용한 구현은 방대한 연산량과 계산의 복잡성으로 인하여 실시간 시뮬레이션이 어렵다. 이 때문에 실시간 처리를 위하여 복잡한 수식을 근사화한다. 유체 시뮬레이션의 이류(advect) 과정에서 근사화를 위해 Semi-Lagrangian 방법을 이용할 때, 연기 시뮬레이션은 시간이 지남에 따라 밀도가 현저히 줄어들고 소규모의 소용돌이(small-scale vorticity) 현상이 급격히 감소하는 등의 수치적 소실이 발생한다. 본 논문에서는 이 문제를 해결하기 위해 이류항(advection term)을 계산할 때 새로운 수치적 방법을 제안한다. 본 논문에서는 이류항의 값을 구할 때, 현재 격자 주변의 값 중에서 다음 단계에 현재 격자의 위치로 오는 속도를 가진 격자를 찾아, 그 격자의 속도를 이류 속도 벡터로 활용한다. 이는 밀도와 소용돌이 현상의 수치적 소실을 줄여서 사실성을 높이고 실시간 처리도 가능하게 한다. 또한 본 논문에서는 GPU 구현을 통해 벡터 연산 등의 효율성을 높이며 시뮬레이션의 속도를 향상시킨다.
성인자녀가 지각한 부모 문제음주가 인터넷 과다사용 문제에 미치는 영향: 타인중심도식과 우울의 매개효과
김이순(Kim, YiSoon),이문희(Lee, MunHee) 한국재활심리학회 2021 재활심리연구 Vol.28 No.2
본 연구는 부모 문제음주와 성인자녀의 인터넷 과다사용 문제와의 관계에서 타인중심도식과 우울의 매개효과를 검증하였다. 이를 위해, 성인 남녀 250명을 대상으로 알코올 자녀 선별 척도, 한국형 성인 인터넷 중독 자기보고형 척도, 타인중심도식 척도, 우울 척도를 실시하였다. 자료 분석은 신뢰도 분석, 기술 통계분석, 상관 분석, 측정모형 분석, 구조모형 분석을 실시하였다. 본 연구 결과는 다음과 같다. 첫째, 부모 문제음주는 타인중심도식, 우울, 성인자녀의 인터넷 과다사용 간에 모두 유의미한 정적 상관을 보였다. 둘째, 부모 문제음주와 성인자녀의 인터넷 과다사용 간의 관계에서 타인중심도식은 부분매개효과를 보였다. 셋째, 부모 문제음주와 성인자녀의 인터넷 과다사용 간의 관계에서 우울의 매개효과는 유의하지 않았다. 넷째, 부모 문제음주와 성인자녀의 인터넷 과다사용 간의 관계에서 타인중심도식과 우울이 순차적으로 매개하였다. 마지막으로 본 연구의 의의와 한계를 논의하였으며 추후 연구에서 필요한 시사점을 제안하였다. This study examined the mediating effects of other directedness schema and depression in the relationship between parent problem drinking and Internet overuse. A total of 250 adults (XYZ male and XYZ female) in South Korea completed the questionnaire assessing children of alcoholic screening, internet addiction proneness, other directedness schema, and depression. Data analysis was conducted to perform reliability analysis, descriptive statistical analysis, correlation analysis, and structural model analysis. The results included: (a) parental problem drinking was significantly and positively correlated with other-directedness schema, depression, and internet overuse: (b) other-directedness schema partially mediated the relationship between parental problem drinking and internet overuse: (c) depression did not mediate the relationship between parental drinking problem and internet overuse: and (d) the pathway between parental problem drinking and internet overuse was sequentially mediated by other-directedness schema and depression. Limitations of the study and implications for future research are discussed.