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파랑 중 오일붐 성능 예측을 위한 2차원 입자법 시뮬레이션
남정우(Jung-Woo Nam),박지인(Ji-In Park),황성철(Sung-Chul Hwang),박종천(Jong-Chun Park),정세민(Se-Min Jeong) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.4
Oil booms are one of the most widely used types of equipment for the protection of coastal areas against oil spills. In some situations, however, there are several types of oil leaks from the oil boom. Important factors regarding these phenomena include the surrounding ocean environment, such as waves, the density and viscosity of oil, the length of the oil boom skirt, etc. To estimate the performance of the oil boom, it is necessary to predict the behavior of the spilled oil and oil boom. In the present study, the prediction of oil boom performance in waves was carried out using the Pusan?National?University?modified Moving Particle Semi?implicit (PNU?MPS) method, which is an improved version of the original MPS proposed by Koshizuka and Oka (1996). The governing equations, which consist of continuity and Navier?Stokes equations, are solved by Lagrangian moving particles, and all terms expressed by differential operators in the governing equations are replaced by the particle interaction models based on a kernel function. The simulation results were validated through a comparison with the results of Violeau et al. (2007).
광양항 컨테이너 터미널 활성화를 위한 유치 가능 물동량 연구
남정우 ( Nam Jung-woo ),김율성 ( Kim Yul-seong ),신영란 ( Shin Young-ran ) 한국해운물류학회(구 한국해운학회) 2021 해운물류연구 Vol.37 No.1
광양항은 고부가가치 클러스터 항만으로의 도약과 정부의 한국판 뉴딜 사업과 연계한 스마트 복합항만 및 항만기반시설을 확충하는 등 항만의 경쟁력을 높이고 있으나, 항만 운영에 근간이 되는 컨테이너 물동량의 실적은 저조한 상태를 보이고 있다. 이에 본 연구는 기종점 분석 및 BCG 분석을 활용하여 광양항 배후권역 내 타 항만을 이용하는 수출입 물동량 중 광양항으로 전환 가능한 물동량 및 품목을 분석하였다. 분석결과 부산항, 인천항, 평택항에서 광양항으로 전환 가능한 물동량은 총 251,938TEU이며, 중국, 베트남, 미국, 일본, 멕시코에서 수출입 중인 플라스틱과 그 제품, 보일러·기계류, 전기기기·TV·VTR 품목의 물동량 109,255TEU를 선제적으로 광양항으로 유치시키기 위해 수출입 기업리스트를 확보하여 타깃 마케팅 전략을 수립하여야 한다. Gwangyang Port is enhancing their competitiveness through the planning high value port, expansion smart complex port and port facility. But the container throughput, which is the basis for port operation, has been in poor performance. Therefore, This study aim to revitalize container terminal in Gwangyang Port. For this goal, this study analyzed the export and import container throughput and items in hinterland that can be attracted to Gwangyang Port with O-D analysis and BCG analysis. As a result of the analysis, the total throughput of cargo in the hinterland that can be attracted from Busan, Incheon, Pyeongtaek Ports to Gwangyang Port is 251,938TEU. In addition, the items to be considered attracting preferentially at Gwangyang Port are plastics and their products, boilers and machinery and electrical equipment, that can be attracted about 110,000TEU. In order to attract the derived volume, it seems necessary to establish a target marketing strategy by securing a company list.
하드밥(Hard Bop) 스타일 재즈음악과 예술지각양식의 변화
남정우(Nam, Jung Woo) 한국대중음악학회 2021 대중음악 Vol.- No.27
1950년대 등장한 하드밥 스타일 재즈는 쿨 스타일에 대한 음악적 대응이었는데, 이는 사회 전반에 만연해 있던 인종 및 위계갈등이 미학적으로 전면화 되는한 국면이었다. 백인 중심으로 전개되던 쿨에 대한 마케팅 전략, 음반 산업 및방송을 통한 음악예술의 대량 보급 및 그에 따른 대중의 예술지각양식의 변화가하드밥의 등장 배경이었다. 벤야민에 따르면 기술복제는 예술작품 아우라의 몰락을 가져오지만 대중의 지각양식의 변화 속에서 ‘동등한 것에 대한 감각’을 불러일으킨다. 이때 지배적 이념이 주도하는 정치의 심미화를 막고 예술의 대중적 정치기능을 지켜내는 것은 자기표현과 향유 및 비평을 예술가와 대중이 주도함으로써가능하다. 하드밥은 이러한 예술의 정치화를 인종 평등의 이념으로 승화시킨 대표적인 사례이다. Being an musical reactivation of African-american musicians’ to sublate Cool Jazz, the emergence of Hard Bop in 1950’s can be regarded as defusing the racial and hierarchical conflict, which was prevailed in american society overall. Leaving aside the marketing strategy of targeting white middle class run by white music business, economic mass-oriented record industry and national radio stations provoked this style evolution and perception change of the contemporary mass to art. According to Benjamin, the technological reproduction era not only leads to the decay of the aura, but also gives rise to the ‘sense of the universal equality of things’ by changing the sense perception to artworks. To prevent aestheticization of politics by dominant ideology, and to preserve its substantial function artist and its mass have to take leading position in self-expression, enjoyment, and criticism. Hard Bop was an exemplar which transcend those risky changes to race equalitarianism by the politicization of art.
선택적 레이저 조형된 AlSi10Mg합금의 후열처리에 따른 Si-rich상 형상변화가 기계적 특성에 미치는 영향
남정우,엄영성,김경태,손인준,Nam, Jung-woo,Eom, Yeong Seong,Kim, Kyung Tae,Son, Injoon 한국분말재료학회 (*구 분말야금학회) 2021 한국분말재료학회지 (KPMI) Vol.28 No.2
In this study, AlSi10Mg powders with average diameters of 44 ㎛ are additively manufactured into bulk samples using a selective laser melting (SLM) process. Post-heat treatment to reduce residual stress in the as-synthesized sample is performed at different temperatures. From the results of a tensile test, as the heat-treatment temperature increases from 270 to 320℃, strength decreases while elongation significantly increases up to 13% at 320℃. The microstructures and tensile properties of the two heat-treated samples at 290 and 320℃, respectively, are characterized and compared to those of the as-synthesized samples. Interestingly, the Si-rich phases that network in the as-synthesized state are discontinuously separated, and the size of the particle-shaped Si phases becomes large and spherical as the heat-treatment temperature increases. Due to these morphological changes of Si-rich phases, the reduction in tensile strengths and increase in elongations, respectively, can be obtained by the post-heat treatment process. These results provide fundamental information for the practical applications of AlSi10Mg parts fabricated by SLM.
자유표면 유동해석을 위한 WMLS 기반 입자법 기술 개발
남정우(Jung-Woo Nam),박종천(Jong-Chun Park),박지인(Ji-In Park),황성철(Sung-Chul Hwang),허재경(Jae-Kyung Heo),정세민(Se-Min Jeong) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.2
In general, particle simulation methods such as the MPS(Moving Particle Simulation) or SPH(Smoothed Particle Hydrodynamics) methods have some serious drawbacks for pressure solution. The pressure field shows spurious high fluctuations both temporally and spatially. It is well known that pressure fluctuation primarily occurs because of the numerical approximation of the partial differential operators. The MPS and SPH methods employ a pre-defined kernel function in the approximation of the gradient and Laplacian operators. Because this kernel function is constructed artificially, an accurate solution cannot be guaranteed, especially when the distribution of particles is irregular. In this paper, we propose a particle simulation method based on the moving least-square technique for solving the partial differential operators using a Taylor-series expansion. The developed method was applied to the hydro-static pressure and dam-broken problems to validate it
남정우(Jung Woo Nam),김남균(Nam Kyun Kim),이제호(Jae Ho Lee),김형준(Hyung Jun Kim) Asia association of Disability and Oral health 2009 대한장애인치과학회지 Vol.5 No.2
Macroglossia is a tongue pathology of multiple etiology as systemic disease like cerebral palsy and Down syndrome etc. It can cause abnormal oral conditions including anterior open bite or dyspnea by changing occlusion and oral habits. So many handicapped children who have macroglossia need to get surgery of large tongue to improve esthetics, function, and treatment stability. The purpose of this report is to evaluate 2 patients, one has cerebral palsy and the other lymphangioma, who have experience of glossectomy with review of literature.
플로터를 이용한 슬로싱 충격하중 저감효과가 선체운동에 미치는 영향
남정우(Jung-Woo Nam),김경성(Kyung-Sung Kim),황성철(Sung-Chul Hwan),허재경(Jae-Kyung Heo),박종천(Jong-Chun Park),Moo-Hyun Kim 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.4
When a liquid cargo tank is partially filled with fluid, internal impact loads can be occurred from the vessel"s motions. In this study, liquid sloshing problems with a thin top layer of particles with a lighter density than water and the coupling effects of the liquid-sloshing/vessel-motion were investigated in order to reduce the sloshing-induced impact loads. The PNU-MPS(Pusan-National-University-modified Moving Particle Simulation) method for solving the liquid motion inside a tank and the CHARM3D BEM(Boundary Element Method) based time-domain ship motion analysis program for vessel-motion simulation were coupled. From the simulation results, we could see that the floaters seemed to be quite effective at reducing the sloshing impact loads in the case of tank-only sloshing proglems, but not as much for the coupling problem with vessel motion.
부유구를 이용한 슬로싱 충격하중 저감 및 슬로싱-선체운동 연성 효과에 관한 수치 시뮬레이션
남정우(Jung-Woo Nam),김경성(Kyung-Sung Kim),황성철(Sung-Chul Hwang),박종천(Jong-Chun Park),Moo-Hyun Kim 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
When fluid is partially filled in liquid cargo tanks, internal impact loads can occur inside the tank by vessel motions. In this study, in order to reduce the sloshing impact loads inside the tank some sloshing problems with a thin top layer with lighter density than water density is investigated to their effects on the maximum impact loading and the coupling effects of liquid-sloshing/vessel-motion. The PNU-MPS (Pusan National University Moving Particle Semi-implicit) method for solving the liquid motion inside a tank and the CHARM3D BEM (Boundary Element Method) based time-domain ship motion analysis program for vessel-motion simulation are coupled. From the simulation results, we can see that the floater seems to be quite effectible for sloshing only problem, but not so much for the coupling problem.