CFD 해석에 의한 수직형 지열교환기의 성능예측

우상우,황광일,김종헌,신승호,Woo, Sang-Woo,Hwang, Kwang-Il,Kim, Jong-Hun,Shin, Seung-Ho 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.3

This study proposes a CFD(Computational Fluid Dynamics) analysis as a method of verification of the designed-data and a supplement of the insufficient experiences in geothermal system, which shows a rapid growth among the renewable energies. The followings are the results. FLUENT 6.2.12 is used as a CFD tool on this study, with the equations of continuity, motion, energy for unsteady flow through pipes and k-epsilon turbulent model. S-type model which has one borehole with diameter 12m by depth 206m and T-type model which has 3 boreholes with $12m{\times}20m{\times}206m$ are proposed, and also the boundary conditions are described. The temperature differences between temperatures by CFD analysis and by on-site measurement are less than 1.5%, this shows a high reliability of CFD analysis process which this study proposes. After 11 days simulation operated 12 hours interval On/Off mode, it is clearly predicted that the outlet temperatures of geothermal pipes are increased by $1.2^{\circ}C$, and $2.2^{\circ}C$ after 4 months. And the outlet temperatures of geothermal pipes increased with increase of the mass flow rates through the pipes. T-type model shows that the 4m distance between boreholes are reasonable because the temperatures at 2m and 6m from boreholes are nearly same.

대상관계와 반사회적 성격특성의 관련성에서 방어유형의 매개효과

우상우 ( Sang Woo Woo ),장문선 ( Moon Sun Chang ) 한국동서정신과학회 2009 동서정신과학 Vol.12 No.1

본 연구에서는 DSM-Ⅳ에서 분류되어 있는 반사회적 성격특성에 대해 우선 초기대상관계 경험과 현재의 자기개념 및 타인개념들의 설명력의 정도를 살펴보았다. 이를 바탕으로 반사회적 성격특성과 대상관계 변수들 간에서 방어유형의 매개효과가 있는지 밝혀보고자 하였다. 이를 위해 본 연구에서 대상은 474명의 남녀 대학생들로, 이들에게 초기대상관계 척도, 자기개념질문지, 타인개념질문지, 한국판 방어유형 질문지, 한국형 성격장애진단 설문지를 실시하였다. 연구 결과 첫째, 반사회적 성격특성을 설명하는 변수에서 대상관계 변수와 방어유형 변수가 반사회적 성격특성을 설명하는 데에 중요한 것으로 나타났으며 특히, 초기대상관계 변수에서는 부정적 부모 모두와의 부정적 관계 경험 그리고 현재대상관계 변수에서는 부정적인 자기개념 및 타인개념이 반사회적 성격특성을 보다 잘 설명하는 것으로 나타났다. 둘째, 대상관계 변수들이 방어유형 중 미성숙 방어유형의 높은 사용과 자기억제 방어유형의 낮은 사용을 통한 매개효과가 확인되었다. 끝으로, 본 연구의 임상적 의의와 제한점에 관해 논의되었다. This research was to investigate the mediating effect of the defense mechanism to the relationship among object relationship and B cluster personality trait. In Study, four hundred seventy four undergraduate students completed th following questionnaires: the Mother-early Object Relationship Scale, Father-early Object Scale, Self-Concept Scale, Other-Concept Scale, Korea-Defense Style Questionnaire, Korea-Personality Disorder Scale. the results of hierarchical multiple regression showed that the effects of early object relationship and present self, object concept, defense mechanism on antisocial personality trait were significant. Second, the mediation effects of defense mechanism between early object relationship, present self, object concept and antisocial personality trait were significant. finally, the the clinical implications and limitations of this study are discussed.

태양광-풍력 하이브리드 발전기에서 태양전지모듈과 풍력발전기 이격거리

우상우(Woo Sang-Woo),김홍우(Kim Hong-Woo),김성수(Kim Sung-Soo) 한국태양에너지학회 2009 한국태양에너지학회 논문집 Vol.29 No.4

This aim of the study is to demonstrate the effect of a photovoltaic module installed on a small wind-photovoltaic hybrid generation system. Computational fluid dynamics(CFD) is used to interpret the velocity field around the photovoltaic module and the blade areas of a wind turbine. According to the simulation results, it is obvious that x_velocity and y_velocity varies very significantly with time near the photovoltaic module. This would lead to an increase of periodic wind load caused by flow separation at the edge of the photovoltaic module. This study discusses the flow characteristics in term of velocity and frequency analysis. Moreover we suggest a distance between a photovoltaic module and a wind turbine to avoid partially the negative effect caused by the photovoltaic module.

초음속 Swirling 제트구조에 미치는 Swirl의 영향

우상우(Sang-Woo Woo),주성열(Sung-Youl Joo),백승철(Seung-Cheol Baek),권순범(Soon-Bum Kwon) 대한기계학회 2002 대한기계학회 기타 간행물 Vol.2002 No.11

행동중독의 예측인자로써 인지특성, 정서특성, 자아특성

우상우 ( Sang Woo Woo ),박기쁨 ( Ki Ppeum Park ),정성훈 ( Sung Hoon Jung ),장문선 ( Moon Sun Chang ) 한국동서정신과학회 2010 동서정신과학 Vol.13 No.1

본 연구에서는 DSM-V에서 기존의 ``충동조절장애``를 대체할 것으로 활발한 논의가 진행 중인 ``행동중독``에 영향을 미치는 심리적변인에 대하여 탐색하였다. ``행동중독``에는 다양한 양상이 있을 수 있으나, 현대 문명의 발달로 최근 관심이 주목되고 있는 ``인터넷중독``, ``휴대폰 중독`` 그리고 ``쇼핑 중독``을 중심으로 행동중독을 개념화 하였으며, 이에 영향을 줄 수 있는 변인들로 정서특성, 인지적 특성 그리고 자기 특성을 중심으로 그 영향력을 확인하였다. 이를 위하여 D시의 K대학에서 심리학을 수강하는 학생 368명을 대상으로 인터넷 중독 척도, 휴대폰 중독 척도, 쇼핑 중독 척도, BDI, BAI, 비합리적 신념 척도, 자아강도 척도, 자기효능감 척도, 자기통제 척도를 웹기반 시스템을 사용하여 인터넷 상에서 설문을 실시하였다. 연구결과 첫째, 인터넷 중독을 설명하는 비합리적 신념으로 무기력, 과잉불안, 문제회피가 도출되었으며, 휴대폰 중독을 설명하는 비합리적 신념으로 개인완벽, 과잉불안, 의존성이, 쇼핑중독을 설명하는 비합리적 신념으로는 개인완벽, 문제회피, 의존성이 도출되어 행동중독의 양상에 따라 비합리적 신념의 공통점 및 차이점이 발견되었다. 둘째, 행동중독에 영향을 미치는 변인들의 설명력을 확인하기 위하여 중다회귀 분석을 실시한 결과 ``인터넷 중독``, ``휴대폰 중독`` 그리고 ``쇼핑 중독`` 모두에서 비합리적 신념과 정서특성 및 자아특성의 유의미한 설명력이 도출되었다. 분석에 투입된 변인들과 그 하위요인에 대한 통계결과를 표와 그래프로 제시하였다. 마지막으로, 본 연구가 가지는 임상적 의의와 제한점에 대하여 논의하였다. This research was to investigate the intellectual trait, Emotional trait and ego trait as predictors of behavior addiction. In study, 368 undergraduate students completed the following questionnaires: the irrational beliefs scale, Beck`s anxiety inventory, Beck`s depression inventory, ego strength scale, self esteem scale, self control scale, mobile phone addiction Scale, shopping addiction scale, internet addiction scale. The results of hierarchical multiple regression showed that the effects of Intellectual trait, Emotional trait and Ego trait on each behavior addiction were significant. Second, sub factors of each predictor were differential significantly attributed to each behavior addiction. finally, the implications and limitations of this study are discussed.

주행차량에 의한 중앙분리대 유도풍의 풍력발전 활용 가능성

우상우(Woo, Sang-Woo),김현구(Kim, Hyun-Goo),장문석(Jang, Moon-Seok),신형기(Shin, Hyung-Ki) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10

The purpose of this study is to confirm the possibility of wind power generation by a vehicle-induced at the median strip on highway. In order to find out wind field information, a CFD method was used. According to the simulation results, the x, y, z-component of the wind velocity around a median strip are rapidly changed at near before and behind a moving vehicle. The x-component of the wind velocity appears high within the range of the length of the passing vehicle, and the wind direction appeared in the opposite direction at the behind of a vehicle. However, x and y-components of the wind velocity at the behind of vehicle are shown constantly. We confirmed possibility of wind power generation using a vehicle-induced wind at the median strip.

Wind Analysis and Site Assessment for Test Site of 3MW Wind Power System

우상우(Woo, Sangwoo),이기학(Lee, Ki-Hak),이상일(Lee, Sang-Il),박종포(Park, Jong-Po) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11

A wind turbine power performance test is very important to wind turbine manufacturers because a wind farm developer or planner must want to define power performance characteristics and reliability of new wind turbines. Based on the IEC 61400-12-1, A wind turbine test site has to be nicely installed at flat terrain for testing. We are developing the wind power system which is IEC wind class IIa model with rated power of 3MW. KEPCO's Gochang power testing center was considered as candidates to build the test site without site calibration. This paper aims to verify the validity of the test site by using implement site assessment result that was based on IEC 61400-12-1.

대기유동장 수치모의 시 지형해상도의 영향

우상우(Woo, Sang-Woo),김현구(Kim, Hyun-Goo) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06

The purposes of this study are to consider the influence of topography resolution on atmospheric flow simulation and to suggest a method of atmospheric flow simulation using a low-resolution DEM. Simulations using a low-resolution DEM has more critical error at near surface than simulations using high-resolution DEM because it is ignored the small curve topography of high-resolution DEM. Therefore when we convert the height differences between low-resolution DEM and high-resolution DEM into the topography roughness, we can be able to reduce the error on atmospheric flow simulations.

수직형 지열교환기의 입ㆍ출구온도에 대한 실측과 CFD 결과 비교

우상우(Sang-woo Woo),김중헌(Joong-hun Kim),신승호(Seung-ho Shin),황광일(Kwang-il Hwang) 한국지열·수열에너지학회 2007 한국지열에너지학회논문집 Vol.3 No.1

The purpose of this study is to use the CFD(Computational Fluid Dynamics) method for the ground source heat pump(GSHP) system with vertical U-tube ground heat exchangers. In order to predict LWT(leaving water temperature) in the length of time, This simulation is used by utilizing FLUENT which is commercial CFD code. It was performed by based on four boreholes in the field. Comparing with the results of CFD and field measurement for LWT, the results of CFD was presented very good agreement with 1.0% average difference.

새만금 방조제에 의한 풍력터빈 입사풍 변화의 전산유동해석

우상우(Woo, Sang-Woo),김현구(Kim, Hyun-Goo) 한국신재생에너지학회 2013 신재생에너지 Vol.9 No.1

Jeollabuk-do has announced a future plan for the Saemangeum Wind Farm which includes the installation of fourteen wind turbines in a single line, located 500m back from the Saemangeum Seawall. It is anticipated as a positive effect that, for sea breeze blowing toward land, the average wind speed could be accelerated and the wind speed distribution could be uniformized by dint of the seawall, an upstream structure of the turbines. At the same time it is also anticipated as a negative effect that the strength of wind turbulence could be increased due to the flow separation generated at the back end of the seawall. According to the results of the computational fluid dynamics analysis of this paper, it has been observed that, at the 50m zone on the road surface located at the uppermost part of the Saemangeum Seawall, the average wind speed has been accelerated by approximately 6~7% and that wind shear has been decreased by 70%, but this positive effect disappears in the zone situated beyond the 100m from the back end of the seawall. It has also been observed that flow separation exists to a limited extent only below the bottom of the blade-sweeping circle and, furthermore, does not extend very far downstream of the wind. As a conclusion, it can be said that the seawall neither positively nor negatively affects the proposed Saemangeum Seawall Wind Farm layout.