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변형을 고려한 차체 골격 및 외관 간격단차 산포 예측기법 개발
황우동(Woodong Hwang),오상규(Sangkyu Oh),최희승(Heeseung Choi) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
The quality of the exterior of a vehicle is a very important factor in determining the luxury of a vehicle. In order to improve the quality of the exterior, the quality of the body skeleton must be secured in advance. The reliability of the previous review on the exterior quality and the quality of the body skeleton is lowered because the deformation factors of the current car body are not taken into account. This technique proposes an integrated analysis methodology that can secure exterior quality and body skeleton quality in advance by linking a dedicated deformation analysis tool that can analyze deformation (Stiffness Matrix) and statistical stack up tolerance analysis.
기체상태의 CO₂ 주입시 주입관내 상변화 및 유동 특성의 수치해석적 연구 : 포항분지 해상 중소규모 CO₂ 지중저장 사업에 적용
정우동(Woodong Jung),성원모(Wonmo Sung),한정민(Jeong-Min Han),송영수(Youngsoo Song),왕지훈(Jihoon Wang) 한국가스학회 2021 한국가스학회지 Vol.25 No.4
대수층에 이산화탄소를 저장하는 기술은 높은 저장능력과 경제성 때문에 지구 온난화를 완화하는 가장 효율적인 방법중 하나이다. 포항분지 해상 중소규모 CO₂ 지중저장 실증은 심부 대수층에 CO₂ 를 저장하는 사업으로 대규모 CO₂ 저장에 필요한 실증요소 기술을 개발하고 검증하는데 목적이 있다. 이 사업의 초기 설계 단계에서 도전적으로 직면하는 문제중 하나는 CO₂ 를 주입하는 주입관에서 주입성을 확보하는 것이다. 이러한 문제를 해결하기 위해 주입량, 압력, 온도, CO₂ 의 상변화 및 그에 따른 열역학적인 물성값 등을 계산하여 주입 조건을 계산하였다. 본 연구를 위해 기체 상태의 CO₂ 를 주입관에 주입하여 기체-액체-초임계 상의 상변화 거동 및 유동 특성의 변화를 OLGA 프로그램을 이용하여 수치해석적으로 분석하였다. 결과를 통하여 CO₂ 의 주입 시스템과 대수층의 공저압을 연계하는 주입조건을 제시하였다. CO₂ storage technology in an aquifer is one of the most effective way to decrease global warming due to a high storage capacity and economics. A demonstration-scale offshore CO₂ storage project was performed in a geological deep aquifer in the Pohang Basin, Korea for a technological development of large-scale CO₂ storage. A challenging issue in the early design stage of the project was to establish the proper injectivity during CO₂ injection. To solve this issue, injection conditions were calculated by calculating injection rate, pressure, temperature, CO₂ phase change, and thermodynamic properties. For this study, we simulated and numerically analyzed CO₂ phase change from gas to supercritical phase and flow behavior in transport piping and injection tubing using OLGA program. Our results provide the injectivity conditions of CO₂ injection system combined with a bottomhole pressure of an aquifer.
Effects of tsunami waveform on overtopping and inundation on a vertical seawall
Lee Woodong,Kim Jungouk,Park Jongryul,Hur Dongsoo 한국수자원학회 2018 한국수자원학회논문집 Vol.51 No.8
수치파동수조에서 안정적인 지진해일을 조파하기 위하여 2차원 수치모델(LES-WASS-2D)에 다양한 파형의 지진해일을 고려할 수 있는 무반사 조파시스템을 도입하였다. 기존 실험에서 측정한 호안주변의 지진해일의 시․공간 파형들과 비교하여 수치계산결과가 높은 정확도를 나타내었다. 이로써 본 연구에서 적용한 수치모델이 지진해일 월파모의에 있어서 적합하다는 것을 보여주었다. 지진해일 월파모의결과로부터 지진해일 체적비와 파고와 수심비에 따른 월퍄량, 침수거리를 고찰하였다. 지진해일의 파형이 넓을수록 월파량이 선형적으로 증가하였으며, 침수거리 또한 증가하였다. 그러므로 고립파 근사이론을 지진해일의 월파 및 침수모의에 적용할 경우, 실제 지진해일보다 수리특성이 과소평가 될 우려가 크다. In order to generate the stable tsunami in a numerical wave tank, a two-dimensional numerical model, LES-WASS-2D has been introduced the non-reflected wave generation system for various tsunami waveforms. And then, comparing to existing experimental results it is revealed that computed results of the LES-WASS-2D are in good agreement with the experimental results on spatial and temporal tsunami waveforms in the vicinity of a seawall. It is shown that the applied model in this study is applicable to the numerical simulations on tsunami overtopping and inundation. Using the numerical results, the characteristics of overtopping and inundation on a seawall are also discussed with volume ratio of tsunami and relative tsunami height. The wider the tsunami waveform, tsunami overtopping quantity and inundation distances are linearly increased. Therefore, the hydraulic characteristics is highly likely to be underestimated against the real tsunami if the solitary wave of approximation theory is applied for the overtopping/inundation simulations due to a tsunami.
조우동(Woodong Jo),손상준(Sang Joon Son),이윤환(Yunhwan Lee),백종환(Joung Hwan Back),노재성(Jai Sung Noh),고상현(Sang Hyun Koh),김현정(Hyun Chung Kim),김진주(Jinju Kim),박미애(Mi Ae Park),홍창형(Chang Hyung Hong) 대한노인정신의학회 2012 노인정신의학 Vol.16 No.1
Objectives:Among non-pharmaceutical measures for preventing cognitive impairment, involving in social activities is known to be very effective. We tried to examine the correlation between social activity and cognitive function. Methods:This study was based on the Suwon Project, a cohort comprising of non-random convenience samples of ethnic Koreans aged 60 years and above. All the subjects completed the study questionnaire which included demographic characteristics, current and past history of illnesses, drug history, Korean version of Mini Mental State Examination (K-MMSE), Korean version of Short Form Geriatric Depression Scale, and Beck Anxiety Inventory. We checked the time consumed in each 9 social activities through the checklist. Results:On multiple logistic regression analysis, the total time spent in social activities wasinversely associated with the K-MMSE score after adjusting confounding variables like age, sex, education level, depression, anxiety and vascular risk factor (β= -0.041, p=0.024). On the other hand, correlation was found between K-MMSE score and time spent in participating in religious party (β=0.053, p=0.003) as well as time spent in elder’s university (β=0.040, p=0.025) after adjustingage, sex, education, depression, anxiety and vascular risk factor. Conclusion:Our results suggest that involving in quality social activities might be more effective in improving cognitive function than spending longer total time in any social activity.
중국 전문물류기업의 경영효율성 분석 - 소유형태를 중심으로
박우동(Park Woodong) 인하대학교 산업경제연구소 2007 경상논집 Vol.21 No.1
This paper applies the input oriented DEA-BCC model to the four type of ownership forms to measure the efficiencies of the special logistic firms which are State Owned Enterprise. Private Enterprise. Foreign Enterprise and Joint Enterprise in China. 140 enterprises were surveyed and analysed. Input factors consist of the number of employees, number of vehicles, size of own warehouses. Output factors are the total sales amount and net-profit before tax. The results show that average managerial efficiency ratio of logistic enterprise is 0.5245. and the most efficient type of ownership form is joint enterprise (0.5913) among others. The reason for this result is that foreign enterprise introduces advanced administration techniques which harmonizes with Chinese culture using Chinese partner. A general problem of special logistic enterprises in China is the need to adjust its inputs to encourage more efficiency.
이우동(Lee Woodong),안태기(Ahn Taegi),김진호(Kim Jinho),정호성(Jung Hosung) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
The standardization system in Urban Transit is the system that verifies and develop the standard, a safety standard, a performance test standard and a quality certification standard to improve the capability, the safety and operational efficiency and that develops technologies of the main installations. We have already developed a signal, electric power in Urban Transit. Also, we have already noticed the standardization of railroad tracks and developed the main installations through the first stage in the standardization in 1995~2006. Still, there remains many fields to standardize, like information and communication facilities, facilities in the station, governmental organizations and maintenance facilities because, Urban Transit is so widespread. In case that we do not keep promoting the standardization in Urban Transit, rather it could hamper development of the Urban Transit. So, it is important to maintain and advance the standardization in Urban Transit. In this paper, we suggest the research course that we would promote, to maintain and develop the standardization in Urban Transit.
비정칙인 파레토분포에 대한 무정보적 사전분포들의 적절성
이우동,강상길,김종태 대구대학교 기초과학연구소 2003 基礎科學硏究 Vol.19 No.3
The goal of this paper is to estimate a probability matching prior in noninformative prior distribution about the non-regular Pareto distribution. Also we study the fittness of posterior distribution by the probability matching prior
Joohyung Kim,Minho Chun,Woodong Jung,Hyemin Park,성원모 한국지질과학협의회 2015 Geosciences Journal Vol.19 No.3
Optimum horizontal well spacing and fracture spacing are obtained through characterizing the changes in flow regime caused by pressure interference in multiple transverse fractured horizontal wells. To obtain this aim, appropriate hydraulic fracture spacing was calculated by using flow regime characteristic called pseudo pseudosteady state where the pressure interference between neighbored two fractures. In addition, the fracture spacing calculated for the shale gas reservoir with permeability of 0.0001 md was applied to calculate the horizontal well spacing when two wells were drilled. Through the calculated optimum fracture spacing and well spacing, we determined the optimal number of horizontal wells in a shale gas reservoir and presented the estimated ultimate recovery.