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수중 운동체의 거동 및 표면 압력하중 예측에 관한 수치적 연구
조성민,권오준,Jo, Sung Min,Kwon, Oh Joon 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.3
In the present study, two phase flows around a projectile vertically launched from an underwater platform have been numerically investigated by using a three dimensional multi-phase RANS flow solver based on pseudo-compressibility and a homogeneous mixture model on unstructured meshes. The relative motion between the platform and projectile was described by six degrees of freedom(6DOF) equations of motion with Euler angles and a chimera technique. The propulsive power of the projectile was modeled as the fluid force acting on the lower surface of the body by the compressed air emitted from the platform. Qualitative analysis was conducted for the time history of vapor volume fraction distributions. Uncorking pressure around the projectile and platform was analyzed to predict impact force acting on the surfaces. The results of 6DOF analysis presented similar tendency with the surficial pressure distributions.
나노 은을 광증착시킨 폴리(에틸렌 테레프탈레이트)/나노-TiO<sub>2</sub> 복합체의 항균특성 연구
조성민,지광환,김정현,권오경,임상규,민병길,Jo, Seong-Min,Jhee, Kwang Hwan,Kim, Jung Hyun,Kwon, Oh Kyung,Lim, Sang Kyoo,Min, Byung Gil 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.6
Nanocomposite films of poly(ethylene terephthalate)(PET) and nano titania($TiO_2$) were prepared by melt compounding with a twin-screw extruder followed by hot pressing for the purpose of investigating antibacterial activity. FE-SEM, EDS and XRD measurements confirmed that nano $TiO_2$ was successfully dispersed at the level of individual particles in the PET matrix. Silver was introduced through photocatalytic reduction by nano $TiO_2$ under UV (254 nm) irradiation to the nanocomposite films after being immersed in aqueous solution $AgNO_3$ (100 ppm Ag ion). Even at 1 wt% of $TiO_2$ content, the nanocomposite with silver photodeposition exhibited strong antimicrobial activity against Klebsiella pneumoniae and Staphylococcus aureus in measurement by shaking flask method.
Development of a Type 4 Composite Cylinder for Self-contained Breathing Apparatus
Sung-min Cho(조성민),Da-eun Kim(김다은),Hye-jin Seong(성혜진),Young-kyu Ko(고영규),Hong-chul Kim(김홍철),Kang-ok Lee(이강옥),Min-sik Jo(조민식),Sung-ki Lyu(류성기) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.12
Aluminum liners used in cylinders are hazardous for human health. In this study, we use a plastic PA liner inside cylinders to solve this problem. Plastic PA liners are widely used in the manufacturing industry in the production of food and beverage containers. We covered the aluminum boss with a plastic liner material and wound the composite fibers over the liner material. To reinforce the dome area, we used low strength / high elongation plastic liner. To predict the performance of the developed product, we conducted structural analyses utilizing the 3D laminated solid element. We verified the soundness of the product by testing the prototype.
Soot 입자를 고려한 로켓 플룸의 적외선 스펙트럼 예측
조성민(Sung Min Jo),남현재(Hyun Jae Nam),김덕현(Duk Hyun Kim),권오준(Oh Joon Kwon) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5
본 연구에서는 복사 데이터베이스를 활용한 LBL 모델을 적용하고, 입자의 영향이 고려된 로켓 플룸의 적외선 스펙트럼을 예측이 수행되었다. 로켓 플룸 내에 존재하는 gas 분자의 스펙트럼을 예측하기 위하여 고해상도 복사 데이터베이스인 HITEMP2010 및 CDSD-4000을 이용하였다. 로켓 플룸 내에 존재하는 입자는 soot 입자로 모델링 하였으며 Mie 이론의 1항 근사 및 Rayleigh 근사를 적용하였다. 두 이론의 적용에 대한 타당성을 검증하였으며, 이를 바탕으로 로켓 플룸의 스펙트럼 예측 결과를 도출하였다. 예측 결과는 실험결과와 비교하여 잘 일치하는 경향이 도출되었으며, soot 입자의 영향을 고려함으로써 짧은 파장 영역 대에서 향상된 로켓 플룸의 스펙트럼 예측 결과가 도출되었다. In the present study, numerical predictions of infrared spectrum of rocket plume with considering particles effect were performed by using a line-by-line radiation model with radiation databases. The high resolution radiation databases, HITEMP2010 and CDSD-4000, were used to predict thermal emission spectra of gas molecules within the rocket plume regime. The particles were modeled as soot particles by using 1st term approximation of Mie theory and Rayleigh approximation. The reliability of modeled effect of soot particles using the two approximation theories was verified. The spectral radiance of rocket plume was predicted based on the verification. The result showed good agreement with experimental data and was improved in the short wavelength range by considering the effect of soot particles.
초기 조건 변화에 따른 사출 운동체의 거동에 관한 수치적 연구
조성민(Sung Min Jo),권오준(Oh Joon Kwon) 한국항공우주학회 2019 韓國航空宇宙學會誌 Vol.47 No.11
본 연구에서는 전산유체역학과 6자유도 운동 해석을 결합하여 사출 조건 변화에 따른 공중 발사운동체의 초기 거동에 관한 해석이 수행되었다. 해석 결과를 실험 측정 데이터와 비교함으로써 해석 기법의 정확성을 검증하였다. 다양한 사출 조건에 대한 사출 안정성 해석이 수행되었으며, 사출운동체의 초기 거동에 지배적인 영향을 미치는 주요 인자로써 운동체의 무게, 전방 및 후방 사출력의 크기를 고려하였다. 이들 인자의 변화 범위에 대한 운동체의 사출 안정성 반응 곡면이 도출되었다. 모든 조건에서 후방 사출력이 작용하지 않는 경우에는 운동체의 안정 사출이 불가한 것으로 나타났다. 또한 운동체의 무게가 감소될수록 불안정 사출 영역이 확대되었다. In the present study, analyses of initial behavior of an air-launched projectile for varying initial conditions are performed by coupling computational fluid dynamics and 6 degrees of freedom calculations. Accuracy of the present numerical methods is validated by comparing the present result with the measured data. Launching safety analyses are carried out for various ejecting conditions by considering weight of the projectile and magnitude of front and rear ejector forces as the major parameters of initial behavior of the projectile. A response surface of the projectile launching safety is obtained in the range of the major parameters. In all the conditions of zero rear ejector force, unsafe launching behavior is observed. As the weight of the projectile decreases, the initial launching behavior becomes more unsafe.
로봇 산업의 다중 공급망 환경을 고려한 생산 및 분배 관리를 위한 유전 알고리듬 개발
조성민(Sung-Min Jo),김태영(Tai-Young Kim),황승준(Seung-June Hwang) 한국데이타베이스학회 2013 Journal of information technology applications & m Vol.20 No.2
Today, the management environments of intelligence firm are changing the way of production planning and logistics management, and are changing the process of supply chain management system. This paper shows the development of information system software for intelligence enterprises is used in supply chain management for robot engineering industry. Specifically, supply chain management system in this paper has been developed to analyze the impact of multi plant and multi distribution environment, showing the process analysis and system development of hierarchical assembly manufacturing industry. In this paper we consider a production planning and distribution management system of intelligence firm in the supply chain. We focus on a capacitated production resource and distribution volume allocation problem, develop a mixed integer programming model, and proposed an efficient heuristic procedure using a genetic algorithm to solve it efficiently. This method makes it possible for the population to reach the feasible approximate solution easily. The proposed regeneration procedures, which evaluate each infeasible chromosome, makes the solution converge to the feasible approximate solution quickly.
CFD 해석을 이용한 출입문 개폐와 인체이동에 따른 음압격리병실에서의 오염물질 유출량 분석
조성민(Jo, Seong-Min),김기훈(Kim, Gi-Hoon),성민기(Sung, Min-Ki) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.10
Recent outbreak of Middle East Respiratory Syndrome(MERS) in KOREA, brought up the public demands for preventing infectious diseases. To fulfill the demands, KOREA Ministry of Health and Welfare(MOWH) and Centers for Disease Control and Prevention(CDC) are working on increasing the number of Negative Pressure Isolation Ward(NPIW) in hospitals. NPIW prevents air migration from ward by maintaining different pressure with adjacent areas. However, previous studies have shown that air migration can be observed in situation of door openings. In this study, different door opening speed and human movement were simulated with Computational Fluid Dynamics(CFD) to observe air migration from NPIW. Total four cases were simulated which differs from each other by door open/close speed and human movement. Result showed that faster door opening speed can reduce air migration due to the total opening duration of the door. The cases with human movement involved, showed higher air migration because the air migrated father to the anteroom with the human. As a result, short duration of the door opening and closing is recommended and when medical staff enters of leaves the ward, they should take few moments before they move to adjacent area.