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      • KCI등재

        셰일저류층의 다단계 수압파쇄에서 응력그림자 효과를 고려한 균열형태 분석

        유정민(Jeong-min Yoo),박혜민(Hyemin Park),왕지훈(Jihoon Wang),성원모(Wonmo Sung) 한국가스학회 2021 한국가스학회지 Vol.25 No.1

        투과성이 낮은 셰일층에서의 다단계 수압파쇄 시, 파쇄단계 간의 서로 근접한 균열로 인해 지층 간 응력간섭이 발생하는 ‘응력그림자효과’가 나타날 수 있다. 이로 인해 균열의 전파 방향성이 변화하거나 비정형적인 형태의 균열이 발생하게 된다. 본 연구에서는 응력그림자효과의 영향에 따른 수압파쇄 균열형태와 생산성을 분석하고자 상용 수압파쇄 시뮬레이터 full-3D모델인 ‘GOHFER’를 사용하였다. 균질한 저류층 모델에서 응력 그림자효과 고려 유무에 따른 분석을 수행하였다. 또한 지력학적 물성이 다른 두 셰일층에서 수압파쇄 모델링을 수행하여 영률과 포아송비에 따른 응력그림자효과를 분석하였다. 선행 파쇄단계의 균열로 인한 응력변화는 최대/최소 주응력을 역전시켜 T-방향보다는 생산성이 미비한 L-방향 균열이 주로 형성되었다. 또한 Marcellus 셰일의 경우 연성 특성을 갖는 Eagle Ford 셰일에 비해 높은 취성으로 인해 균열의 폭이 더 두껍게 형성되어 균열 체적이 더욱 크게 산출되었다. Marcellus 셰일지층의 영률이 Eagle Ford 셰일에 비해 크게 낮기때문에 stage 2에서 응력그림자효과의 영향을 적게 받는 것을 확인할 수 있었다. 이처럼 응력그림자효과는 균열 간의 간격 뿐만 아니라 지력학적 물성에 따라서도 크게 달라진다. 그러므로 좀 더 정확한 균열 형태와 현실성 있는 생산성 예측하기 위해 응력그림자효과는 고려되어야 한다. During multi-stage fracturing in a low permeable shale formation, stress interference occurs between the stages which is called the “stress shadow effect(SSE)”. The effect may alter the fracture propagation direction and induce ununiform geometry. In this study, the stress shadow effect on the hydraulic fracture geometry and the well productivity were investigated by the commercial full-3D fracture model, GOHFER. In a homogeneous reservoir model, a multi-stage fracturing process was performed with or without the SSE. In addition, the fracturing was performed on two shale reservoirs with different geomechanical properties(Young’s modulus and Poisson’s ratio) to analyze the stress shadow effect. In the simulation results, the stress change caused by the fracture created in the previous stage switched the maximum/minimum horizontal stress and the lower productivity L-direction fracture was more dominating over the T-direction fracture. Since the Marcellus shale is more brittle than more dominating over the T-direction fracture. Since the Marcellus shale is more brittle than the relatively ductile Eagle Ford shale, the fracture width in the former was developed thicker, resulting in the larger fracture volume. And the Marcellus shale’s Young’s modulus is low, the stress effect is less significant than the Eagle Ford shale in the stage 2. The stress shadow effect strongly depends on not only the spacing between fractures but also the geomechanical properties. Therefore, the stress shadow effect needs to be taken into account for more accurate analysis of the fracture geometry and for more reliable prediction of the well productivity.

      • SCOPUSKCI등재
      • 현대건축에 나타난 한국전통 디자인 표현특성에 관한 연구

        유정아(Yoo, Jung-A),윤은경(Yun, Yean-Kyung) 한국실내디자인학회 2017 한국실내디자인학회 학술대회논문집 Vol.2017 No.10

        Since the 1980s, social and cultural changes have grown rapidly, so the local culture has grown rapidly. So, people"s interest in culture, art, and history has increased. Brand hotels, including domestic brands and design hotels, such as Starwood, Marriott, Hilton, and Intercontinental Hotels and Resorts also feature the characteristics of Korean traditions. Hotel design has become another basis for enhancing the value of domestic brands as well as enriching the cultural tourism by prioritizing the customer"s need. This study is an analysis of interior design in domestic hotels engaged with unique traditonal Korean design. The study aims to analyze the interior space featured in the domestic hotels as a case of applying Korean traditional design features. Therefore, the hotel features a uniquely built hotel that embodies the characteristics of Korean traditional design. The analysis analyzes the characteristics of the Korean traditional design expression and the hotel"s relationship with the hotel and provides directions.

      • KCI등재후보

        주관적 체형인식이 체중조절방법 선택에 미치는 영향: 2012년 국민건강영양조사 자료를 이용하여

        유정은 ( Jeong Eun Yoo ),오달석 ( Dal Seok Oh ),김남권 ( Nam Kwen Kim ) 한방비만학회 2014 한방비만학회지 Vol.14 No.1

        This study was to investigate how body-shape perception could influence to weight control practice both in normal and obese group. Methods: We used 2012 Korea National Health and Nutrition Examination Survey to analysis 1) weight control practices of population; 2) consistency between body-shape perception and body mass index; 3) comparison weight control practices between normal group and body mass index (BMI) obese group in perceptional obese group; 4) odds ratio of BMI obese group using herbal drugs for weight control practice in perceptional obese group. Results: We found that study population tends to choose exercise, dietary restriction, meal skip, health functional food, one-food, drug, herbal drug, fasting and self-medication in order of frequency to control weight. The agreement between body-shape perception and BMI within obese group was approximately 64% with 0.40 of Cohen’s Kappa coefficient, ranging from 0.384 to 0.423. Within perceptional obese group, choosing each weight control practice methods ratios between normal BMI group and obese BMI group were not significantly different. Within perceptional obese group, obese BMI group showed significant odds ratio (2.58, 95% confidence intervals, 1.38∼4.85) than normal BMI group in choosing herbal medication for weight loss when adjusting other variables. Conclusions: We concluded that body-shape perception might be an important factor for choosing weight control program, and roles of Korean medical doctors thought to be enhanced for using herbal medication for weight loss.

      • KCI등재
      • 경동사구문에서의 주제 지속성

        유정숙 ( Jeongsuk Yoo ) 현대영미어문학회 2017 현대영미어문학회 춘계학술대회 발표논문집 Vol.2017 No.-

        There have been a lot of discussions on the light verb constructions(LVC, in short) in English. However, they have mostly ignored speaker's intention in the whole context, treating and analysing it just as a single unit of sentences, which resulted in indifference toward differences of subtle meanings between LVC and heavy verb constructions in terms of whole contextual usages. This treatment and analysis has not contributed to understanding LVC as speaker's components intended contextually in the context as a whole. In order to tackle this issue, the present study focuses on discourse mechanisms such as focus shift, thematization, or new/old information, based on the usages in COCA. With focus shift, it is suggested that the derived noun itself in LVCs such as 'make a decision' should be generated from its heavy verb counterpart with it in focus for its generic action meaning, by defocusing its corresponding heavy verb such as 'decide' designating a specific action for the associated focused NPs within the goal 'to NP'. It is also found that the introduction of a new LVC in the current discourse context, thereby focalizing its derived noun, brings forth topicalization in the succeeding discourse, including the derived noun with the definite article.

      • KCI등재

        D-1,3-디옥솔란 및 L-1,3-옥사티올란 5-페닐세레닐 피리미딘 뉴크레오사이드의 합성

        유정만(Jung Man Yoo),문현주(Hyun Joo Moon),정병호(Byung Ho Chung),최보길(Bo Gil Choi),홍준희(Joong Hee Hong),천문우(Moon Woo Chun) 대한약학회 1996 약학회지 Vol.40 No.1

        Eight new D-1.3-dioxolanyl and L-1,3-oxathiolanyl nucleosides containing 5-phenyl- selenyl pyrimidine bases which are expected to have antiviral activity were synthesized. Condensation of D-1,3-dioxolane acetate and L-1,3-oxathiolane acetate with 5-phenylselenyl pyrimidines gave anomeric mixtures of their nucleosides which were separated by silicagel column chromatography.

      • KCI등재

        청소년 운동선수들의 운동만족 예측을 위한 심리적 욕구와 자아탄력성의 역할

        유정인(Yoo, Jung-In),김성규(Kim, Sung-Kue),임용택(Rhim Yong-Taek) 한국체육교육학회 2014 한국체육교육학회지 Vol.19 No.3

        본 연구는 청소년 운동선수들의 운동만족을 예측하기 위하여 심리적 욕구와 자아탄력성의 역할을 탐색하는데 목적이 있다. 이러한 연구목적을 달성하기 위하여 수도권 소재한 고등학교(남?여)팀 종목 및 개인종목 선수 276명을 편의표본 추출법을 사용하여 자료를 수집하였다. 자료수집 후 기술통계, 상관분석, 다변량분석, 구조모형 검증을 실시하였다. 분석결과 첫째, 성별에 따른 측정변인 하위요인 중 심리적 욕구의 자율성, 유능성, 자아탄력성의 낙관적 태도, 운동만족의 팀 단합과 헌신에는 남자가 여자보다 더 높고, 통계적으로 유의한 차이가 있는 것으로 나타났다. 둘째, 운동종목에 따른 측정변인의 하위요인 중 심리적 욕구의 자율성은 개인종목이 단체종목보다 높고, 운동만족의 팀 수행은 단체종목이 개인종목보다 높게 나타나 통계적으로 유의한 차이가 있는 것으로 나타났다. 마지막으로 청소년 운동선수들의 운동만족을 예측하기 위하여 설정한 모형에서 심리적 욕구는 자아탄력성과 운동만족에 긍정적인 영향을 미친다. 하지만 자아탄력성은 운동만족에 부정적인 영향을 미친다. The purpose of this study is to examine relationship between psychological needs, ego-resilience and exercise satisfaction of adolescent athletes. For this purpose, a population was formed with participate in high school(man, woman) sports team and individual sports which located in metropolitan area; a total of 276 questionnaires were analyzed by convenience sampling and self-administration. The data obtained by the survey was analyzed by the descriptive statistics, correlation analysis, multivariate analysis and structural model. As for data processing and analysis, First, in the measured by sex variables, autonomy of the psychological needs, competence, optimistic attitude of ego-resilience, team integration and dedication of the team sports were men higher than women and there were significant differences between the sex variables Second, in the measured by variables sports division, autonomy of the psychological needs is the individual sports higher than team sports, performing team exercise satisfaction were team sports higher than individual sports so there were significant differences. Finally, set in the model to predict the exercise satisfaction of adolescents athletic, psychological needs is a positive impact on the ego-resilience and exercise satisfaction but ego-resilience has a negative effect on the exercise satisfaction.

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