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분야별 하부시스템의 최적화를 통합한 분해기반 MDO 방법론
정희석,이종수,Jeong, Hui-Seok,Lee, Jong-Su 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9
The paper describes the development of a decomposition based multidisciplinary design optimization (MDO) method that coordinates each of disciplinary subspace optimization (DSO). A multidisciplinary design system considered in the present study is decomposed into a number of subspaces based on their own design objective and constraints associated with engineering discipline. The coupled relations among subspaces are identified by interdisciplinary design variables. Each of subsystem level optimization, that is DSO would be performed in parallel, and the system level coordination is determined by the first order optimal sensitivities of subspace objective functions with respect to interdisciplinary design variables. The central of the present work resides on the formulation of system level coordination strategy and its capability in decomposition based MDO. A fluid-structure coupled design problem is explored as a test-bed to support the proposed MDO method.
논문(論文) : 형기(形氣)의 개념으로 이해한 체질치료 연구
정희석 ( Hui Seok Jeong ),김도훈 ( Do Hoon Kim ) 대한한의학원전학회(구 대한원전의사학회) 2015 대한한의학원전학회지 Vol.28 No.2
Objectives : To find appropriate constitutional therapy by understanding Hyeong and Gi from the perspective that "Gi is inner position, and Hyeong is outer position, and Yang converts to Gi, Eum makes Hyeong(氣裏形表, 陽化氣 陰成形)". Methods : 1. Defined Hyeong(形)and Gi(氣)and studied Wonhyeong(圓形) and Banghyeong(方形), the shapes that are formed as a result of Gi-movement. 2. Used ``Hyeong-Gi`` concept to analyze physiological and pathological phenomena; classifies parts of the body into Sasang by extrapolating from WonBang concept; and studied Sasangchejil. 3. Based on the above 1 and 2, studied medical direction of Sasangchejil written in HwangjenaegyeongsomunoTongcheon Results : 1. Wonhyeong is the result of Yang(陽) movement, whereas Banghyeong is the result of Eum (陰) movement. 2. Hyeong(body) can be classified into Won(圓, circle) and Bang(方, square) or more specifically into Won of Won, Bang of Won, Won of Bang, Bang of Bang. Each corresponds to Taeyang(太陽), Soyang(少陽), Taeeum(太陰), and Soeum(少陰). 3. The constitutional therapy can be formulated by refering to 「Tongcheon(通天)」and by taking into consideration that each Sasang constitution has a bias toward Mok(木), Hwa(火,) Gum(金), Su(水). Conclusions : Basic treatment for round shaped people needs to be focused on a cure of Boeum(補 陰) and Bojeong(補精), whereas for angular shaped people, treatment should be about Bogi(補氣) and Boyang(補陽). Treatment for Taeyangin(太陽人) should be about strengthening Ganeum(肝陰) and reducing Paeyang(肺陽) and for Soyangin(少陽人), the treatment needs to be strengthening Sineum(腎陰) and diminish Biyang(脾陽). Taeeumin(太 陰人) should receive a cure that reinforces Pyeyang(肺陽) and brings Ganeum(肝陰) down, whereas Soeumin(少陰人) should have a cure that strengthens Gi and increases Yang.
배터리 냉각 플레이트의 성능 예측을 위한 비정상 전산유동해석 및 실험적 연구
박상환(Sang Hwan Park),장경식(Kyoungsik Chang),조홍영(Hong Young Cho),정희석(Hui Seok Jeong),손성만(and Sung Man Sohn) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
본 논문에서는 전기자동차용 배터리 모듈의 방열을 위해 냉각 플레이트를 이용한 수랭식 냉각방식을 전산유체역학과 실험적 방법을 이용하여 연구하였다. 냉각 플레이트의 냉각 성능을 향상시키기 위해 내부 유로 형상을 변경하였으며 전산유동해석을 통해 성능을 예측하였다. 냉각 플레이트와 발열패드를 이용하여 간이 실험을 수행하였으며, 실험 결과와 비교를 위해 비정상 유동해석을 진행하여 입·출구 온도 차를 이용한 방열량을 계산하였다. 전산열유동해석을 통하여 개선된 유로 형상이 11.5% 더 높은 방열 성능을 예측하였으며 실험 결과인 11.9% 방열량과 비슷한 결과를 얻을 수 있었다. In the present work, water cooling system with a cooling plate was studied for cooling of lithium-ion battery module in electric vehicles. In order to improve the cooling performance of the cooling plate, the shape of the internal flow path was re designed based on the original straight channel type. The performance was predicted through computational flow analysis. Unsteady flow analysis was performed for comparison of cooling performance of both types. The heat was calculated with temperature difference between inlet and outlet of water at the cooling plate. Also simple experiment with cooling plate and heating pad was conducted. The improved cooling plate predict 11.5% higher performance in CFD, which is similar with experimental results, 11.9% higher performance.
배터리 모듈 냉각 플레이트의 냉각 성능 예측을 위한 비정상 전산유동해석 및 실험적 연구
박상환(Sang Hwan Park),장경식(Kyoungsik Chang),조홍영(Hong Young Cho),정희석(Hui Seok Jeong),손성만(Sung Man Sohn) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.7
전기에너지를 사용하는 친환경자동차에서는 리튬 이온 배터리가 주로 사용되고 있으며 별도의 냉각 장치를 필수적으로 설치하여야 한다. 본 논문에서는 냉각 플레이트를 이용한 수랭식 냉각방식을 연구하였다. 냉각 플레이트의 냉각 성능을 향상시키기 위해 내부 유로 형상을 개선하였고 전산유동해석을 통해 성능을 예측하였다. 실험 결과와 비교를 위해 비정상 유동해석을 진행하였고 냉각 성능 비교는 입·출구 온도 차를 이용한 방열량을 계산하여 비교하였다. 전산해석을 통해 개선된 유로 형상이 11.47% 더 높은 방열량을 예측하였다. 실험을 통해 냉각 플레이트의 성능을 측정하고 전산해석 결과를 검증하였다. 실험 결과 11.86%의 더 높은 방열량을 나타냈으며 전산유동해석과 5% 이내의 오차를 보였다. Electric vehicles mainly use lithium-ion batteries, and a cooling system must be installed in them. In this study, a water-cooling system that uses a cooling plate was studied. The shape of the internal flow path was improved to enhance the performance of the cooling plate; the performance was predicted using computational flow analysis. Unsteady flow analysis was performed to compare the experimental results, and the cooling performances were compared by calculating the amounts of rejected heat using the inlet and outlet temperature differences. The improved flow-path shape showed an 11.47 times higher amount of rejected heat. The performance of the cooling plate was also measured through an experiment, and the computational analysis result was verified. An 11.86 times higher amount of rejected heat and an error within 5% were obtained in the computational flow analysis.
차량용 연료전지 스택의 안정적 반응 가스 공급을 위한 중앙 유동 분배기 형상 설계에 관한 수치적 연구
정혜미(Jung, Hye-Mi),엄석기(Um, Suk-Kee),정희석(Jeong, Hui-Seok),이성호(Lee, Seong-Ho),서정도(Seo, Jeong-Do),손영진(Son, Yeong-Jin) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
In this study, two types of central flow distributor designs are presented and compared to obtain the optimal compact design which has the least flow resistance and the uniform flow distribution in a vehicular fuel cell stack. For effective and reliable prediction on the thermo-flow characteristics of the reactants flow over the entire fuel cell stack domain, open channel flow in the bipolar plates of the power generating cells were simulated by applying a simplified flow resistance model with an empirical porous concept. A number of case studies were performed to figure out an optimal configuration of a central flow distributor device in terms of the time-dependent thermo-flow behavior and load-dependent flow distribution. The results showed that the stable and load-independent thermo-flow uniformity is very design specific, which is closely associated with the design of central manifolding devices in order to achieve the enhanced volumetric power density and the reliable long-lasting operating of fuel cells.