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      • [가솔린엔진부문] 다양한 조건에서 촉매의 온도 및 유동분포에 관한 수치적 연구

        기우(K.W. Nam),최병철(B.C.Choi),정우(W.N.Juhug),조창주(C.J.Cho) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

        Numerical study was carried out to analyze the characteristics of flow and temperature distribution of automotive catalytic converter with various geometries and driving conditions in steady state. The CFD software FLUENT using FVM method was used in this study. Monolith brick was modernled using porous media and heat generation effect on monolith brick was involved with heat source term in energy equation.<br/> It was found that the geometry of the catalytic converter and engine driving conditions had little effect on flow and temperature distribution within converter, and the flow distribution within monolith brick depended strongly on temperature distribution.

      • KCI등재후보

        한국선교 출구전략에 관한 소고

        남정우 ( Jeung Ou Nam ) 한국복음주의선교신학회 2012 복음과 선교 Vol.20 No.-

        The mission of korean church seems not yet to have any serious considerations on the necessity and significance of missionary devolution proverbaly because of the short history of missional experiences. However now it has been time to discuss and prepare the missionary exit strategy, missional devolution with the continuous efforts to activate missionary calling out andsending. Author thinks that Jesus was the originator to establish and execute the Exit Strategy from Mission Field. From the beginning of His missionary activities though not mentioned(Jn. 16:4), He planned and prepared his own passing over. In the course of time He confirmed that he should go back to the father when the disciples confessed Jesus of nazareth as the Messiah and the Saviour. He did it even three times(Mk 8:31, 9:30, 10:3334). He said that His own dying was ``Leaving``(Jn 16:7, 28), ``Going back to the Father``(Jn 16:10, 28, 17:11, 13), ``not seeing any more``(Jn 16:16). He was sure that His leaving wae useful for the disciples and next their missions. He prayed cordially when he left. The whole content of John 17 is the prayer of Jesus just before His death(leaving). the next model next to Jesus for the missionary devolution is the apostle Paul.(1Tim 2:2). We have to considerate seriously at least 5 agendas in discussing the missionary exit strategy. First, Strategy for empowering the local leadership. For this purpose, above all, it is necessary to escape from the missionary colonycentered program, to cast off the patriarchal missionary work style, in stead, from the beginning of the training for missionary it should be ``the course of missionary leadership devolution to locals.`` Second, First, Strategy for selfsupport of finance. The church built by outside money through foreign missionay is naturally considered as a church of outlanders, not local church. Because there was not the local dweller`s devotion.(Matt. 6:21). Third, discussion about the right time to introduce the missionary exit strategy in the course of missionary works. Fourth, discussion to build the missional facilities including church building, seminary, etc. The property holding without any reflecting devolution often can be temptations and hurdle to both locals and missionaries. Finally, discussion about the psychological obstacles in the course of preparing the passing over. Generally senior missionaries experience psychologically anxiety and loneliness. Do they do well really after passing over? What should I do after devolution? It is necessary to find and prepare the right missional answer to these questions. And it has to be deal with the missionary realistic welfare after retirement. Additionally, we have to be careful not to behave devolution with heroism spirit. As described above, there are many difficulties in preparing the missionary exit strategy including so complicated transfer of property and leadership. It is difficult to find the right solution just with one man`s idea. Therefore it is suggested that it should be organized such as ``counselling committee for the missionary devolution`` in oder that the senior missionaries could well pass over the leadership and property to the locals. From now on, korean church which until now has concentrated to call out and send missionaries as many as possible must set up the missionary exit strategy. The future of korean mission is depend upon the strategy of finishing up, that is missionary devolution.

      • KCI등재

        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

      • KCI등재

        특집 : 다문화 상황과 선교 ; 현대 사회 선교의 대상 -명목상 기독교인에 대한 연구

        남정우 ( Jeung Ou Nam ) 한국복음주의선교신학회 2010 복음과 선교 Vol.13 No.-

        To be a nominal Christian is to be a Christian in name only. The term refers to those people who insist on calling themselves Christian but who do not identify with any local congregation or denomination except at the time of infant baptism, marriage and funeral. In the bible, nominality may be found in the figures such as Lot, Esau, Saul, Judas and Simon Magus. Outside the bible, nominality may also be found in historical figures such as Constantine, Stalin and Il-Sung Kim. Nominality has a deep and long history. The Protestant Church has actively participated in overseas missions since the time of William Carey (1761-1843). As a result, Christianity was able to become a world-wide religion and experience a large population growth. Inwardly, however, Christianity failed to be sensitive to the spiritual, cultural and social changes and to respond appropriately, As a result the number of nominal Christians continue to grow, seriously challenging and threatening missions, In fact this nominality may become the most dreadful and potent attack on the missions in the 21st century, if 0it is not treated seriously and properly adressed. As a historical example, the case of Russia may be considered. The former Soviet Union became a communist country, aggressive threatening the free democratic world for over seventy years, in part because it didn`t consider the nominality of the Orthodox Church which was the dominant over 80% of population of the time. This seems to be rather strange rationale; doesn`t really make sense. Therefore, an important task to be considered in relation to contemporary mission and evangelism is nominalism. Church leaders must concern themselves with evangelism strategy aimed atnon-believers, but also for at nominal Christians. One must analyze the specific reasons why such a nominal Christians become nominal and prepare a strategy to solve the problems. This task is urgent formission and evangelism in contemporary society. The western churches which held the world missionary conference of Edinburgh in 1910 were full of the optimism and confidence that the evangelization of the known world in their generation would be possible. These churches thought that the bject of evangelism lay beyond the western world and thus concentrated their efforts on developing a strategy to evangelize non-western people, Contrary to such expectations, however, just after the second world war, the western churches began to weaken because of the rapid growth of the nominal Christians, As a result, such weakened world of the west became a mission field. This is an important lesson in history for the Korean church, which must prepare itself with regard to evangelism considerations and strategy for the future. One must remember that there exist two objects of evangelism: the unreached people those, consisting of those who do not know Jesus Christ and also the unreached generation, meaning those who show no allegiance to Jesus Christ.

      • KCI등재

        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).

      • 스티그마 극복 대안으로서 개인의 긍정적인 자아개념 구축 서비스 제안

        남정우(Jungwoo Nam),방우진(Woojin Bang) 한국HCI학회 2024 한국HCI학회 학술대회 Vol.2024 No.1

        스티그마란, 사회적으로 부정적인 표식이 붙은 특정한 집단이나 개인에 대한 편견과 차별을 나타내는 개념으로 정의된다. 스티그마 대상자들은 사회에서 가치가 떨어지고 비하받는 정체성을 가지며, 스티그마로 인한 차별을 정기적으로 겪는다. 본 연구에서는 자아 개념(self-concpet)에 초점을 맞추어, 자기 스티그마(self-stigma)를 가지고 있는 사람들이 자아 개념을 긍정적으로 재인식할 수 있는 기회를 마련하고자 한다. 일부 사람들이 자신이 읽고 있는 책을 다른 사람들에게 알리고 싶어하지 않기 때문에, 책 위에 북커버를 덮어서 휴대하는 모습을 보인다. 이러한 상황 속에서, 우리는 긍정적인 자아 개념 구축을 통한 자아 존중감 향상을 개인의 스티그마 대응 전략으로 채택했으며, 긍정적인 자아 개념 구축을 통해 스스로에 대한 긍정적인 평가를 획득하고자 한다. 스티그마에 의한 위협은 개인이 타인의 부정적 평가를 내면화 했을때 그 효과를 발휘한다. 따라서, 우리의 서비스는 자아 개념 구축과 자아 개념 표현을 목적으로 진다. 스티그마 대처 방안으로서 생성형 AI(ChatGPT)를 기반으로 하는 북커버 디자인 서비스, “Don’t Judge Me” 서비스를 설계했다.

      • KCI등재

        부산신항 컨테이너터미널 내 공유가능 자원들의 수요분석 연구

        남정우(Jung-Woo Nam),심민섭(Min-Seop Sim),차재웅(Jae-Ung Cha),김주혜(Joo-Hye Kim),김율성(Yul-Seong Kim) 한국항해항만학회 2021 한국항해항만학회지 Vol.45 No.4

        글로벌 해운·항만의 산업트렌드 변화에 따른 부산항 경쟁력 제고를 위해 부산신항 운영사의 단계적 통합과 더불어 효율적인 항만자원 활용을 위한 항만물류자원 공유플랫폼 개발이 추진되고 있다. 하지만 터미널 간 비효율적인 자원공유는 오히려 불필요한 추가 비용을 발생시키거나 항만 생산성의 저해 요소가 될 수 있어 공유자원에 대한 정확한 수요와 공유수준 및 공유효과, 공유가능성을 분석하고자 한다. 본 연구에서는 부산신항과 북항의 터미널 관계자를 대상으로 설문조사를 실시하였으며, IPA 분석을 통해 우선적으로 공유가 이루어질 수 있는 항만자원에 대해 분석하였다. 분석결과 항만 내 장비의 경우 Y/T, R/S, T/H가 최우선 고려사항으로 나타났으며, 항만 내 시설은 안벽 및 에이프런, 공컨 장치장, 냉컨 장치장이 최우선 고려사항으로 나타났다. 또한, 항만 내 데이터는 게이트 상태정보, 장비제원정보, 안벽 및 에이프런 상태정보 등이 최우선 고려사항으로 나타났다. To enhance the competitiveness of the Busan Port in accordance with changes in global shipping and port industry trends, the Busan New Port is promoting step-by-step integration and developing a port resource-sharing platform. However, inefficient resource-sharing can cause unnecessary additional costs or impede port productivity, so accurate supply and demand matching of shared resources is required. In this study, the supply and demand of port resources were investigated for employees of Busan New Port and North Port, and port resources that could be ideally shared through IPA(Importance Performance Analysis) were analyzed. As a result of analyzing the equipment in the port, Yard Tractor, Reach Stacker, and Top Handler were the top considerations, and for facilities in the port, berths and aprons, empty container yards, and refrigerated container yards were the most important considerations. As for the data in the port, gate status, equipment specifications, and berth and apron conditions were the top considerations.

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