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PIV기법을 이용한 분기 사각덕트네의 유동특성에 관한 실험적 연구
이행남,박길문,이덕구 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.6
The flow characteristics in a bifurcated duct are investigated experimentally. Physical properties such as mean velocity vectors, mean x-y stress distributions, mean vorticity and total pressure distributions are Obtained for three different Reynolds numbers(578, 620, 688) Using PIV measurements and CFD analysis. Also, three different rates of discharge Q=26.11 l/min, Q=28.11 $\ell$/min, Q=31.17 $\ell$/min) were selected foy experimental conditions. The results of this study would be useful to the engineer in designing the flow systems for heating, ventilation, air conditioning and wastewater purification plants.
헤겔의『정신현상학』에서 양심의 변증법과 상호인정의 공동체
이행남 한국동서철학회 2022 동서철학연구 Vol.- No.105
In this paper, I would like to reveal the unique aspect of the ‘Conscience’ section of 『Phenomenology of Spirit』(hereinafter ‘Conscience’ section), which in the ethical dimension is different from the theory of conscience in 『Philosophy of Right』. In the latter, conscience was noted as a pre-step to prepare for the transition to 'ethical life' as the final figure of 'morality', whereas in the former, what kind of 'immanent' process of conscience is developed is dealt with. To clarify this, I first briefly review the “moral worldview” that forms the immediately preceding step before ‘Conscience’ section in order to understand the historical and systematic background of the inevitability of development of the conscience (2). Next, the aspect of the intrinsic dialectic of conscience in the ‘Conscience’ section and the three pairs of tensions driving it are dealt with (3). Then, I will show, through a full-scale analysis and reconstruction of the ‘Conscience’ section, how the conscience is transformed in a series of shape changes ('beautiful soul', 'conscience in action', 'evaluating consciousness', etc.) and in a progressively developed reciprocal relationsfrom (self-sufficient enjoyment to antagonistic reciprocity) (4). Finally, it is shown that the ethical grammar of the true community reached in this way is the relationship of mutual recognition itself. A true community of communication is not one-sided, but an open act of confession and forgiveness that is mutually symmetrical, and openness ready to mutually acknowledge the 'equality' in which all members claim universality but are tied to specificity. It is argued that the true community can only be constructed on this open mutual recognition (5) 필자는 본고에서 『법철학』의 양심론과는 다른, 『정신현상학』의 ‘양심’ 절(이하 ‘양심’ 절)이 윤리적 차원에서 갖는 고유한 측면을 드러내고자 한다. 전자에서 양심이 ‘도덕성’의 마지막 형상으로서 ‘인륜성’으로의 이행을 예비하는 단계로서 주목되었다면, 후자에서는 ‘양심 내재적인’ 관점에 따라 양심의 변증법적 운동이 어떻게 전개되는지가 다루어진다. 이를 분명히 하기 위해 필자는 우선, 양심이 필연적으로 등장하는 역사적이고도 체계적인 배경을 이해하기 위해 그 직전 단계를 이루는 ‘도덕적 세계관’의 한계를 간략히 분석한다(2). 다음으로, ‘양심’을 구성하는 세 쌍의 이중적 요소들을 제시하고 이에 힘입어 양심의 변증법적 운동이 어떻게 추동되는지를 예고한다(3). 이어서 ‘양심’ 절에 대한 본격적인 분석 및 재구성을 통해 양심이 일련의 형상의 변화(‘아름다운 영혼’, ‘행위하는 양심’, ‘평가하는 의식’ 등) 및 지평의 전환(독자적 “존엄”의 향유로부터 대립적 상호 관계로)을 통해 점점 발전된 상호 관계로 나아가는 과정을 헤겔의 서술에 천착하여 재구성한다(4). 마지막으로 이렇게 도달되는 진정한 공동체의 윤리적 문법은 상호 인정 관계 ‘자체’를 본질로 함을 보인다. 진정한 소통적 공동체의 정신은 오로지 ‘일방적인 것이 아닌 상호 대칭적인’ 고백과 용서라는 개방적 행위를 통해서만, 그리고 구성원 모두가 자신의 특수한 행위에 제기되는 상대의 규범적인 비판에 응하면서 우리의 ‘의무’를 함께 만들어나가는 집합적 실천을 통해 보편을 지향하는 주체로서 서로를 인정할 준비가 되어 있는 자들의 사이에서만 열린다(5)
이행남,박길문,이종구 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2
The velocity and pressure distributions in a bifurcated duct are investigated experiment. Physical properties such as mean velocity vectors, mean vorticity and total pressure distributions are obtained for three different Reynolds numbers(578, 620, 688) using PIV measurements and CFD analysis. Also, two different dividing duct(90°) was selected for experimental study. The results of this study would be useful to the engineer in designing the flow systems for heating, ventilation, air conditioning and wastewater purification plants.
이행남,박길문,이덕구,정한별,김건일,설재림 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1
The sirocco fan is used to get low noise, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc... because there are not problems even it is mixed with a any kind of liquid, gas, and solid. The flow characteristics in sirocco fan are investigated by PIV. The experiment using PIV measurement for Test section's flow characteristics acquired velocity distribution, Condition : when sirocco fan in automobile air controller maximum 1450RPM, and a revolution is a variation (l)950RPM, (2)l100RPM, (3) 1250RPM. The agreement a experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems
이행남 조선대학교 동력자원연구소 1992 動力資源硏究所誌 Vol.14 No.2
A vibration of ferrofluid is studied in a circular straight tubes, assuming that the effect of a ferrofield on a tube friction is constant. The experimental study is carried out for comparison with the theoretical values. The theoretical values are good agreement with the experimental results. The maximum amplitude of vibration increses almost linearly with ferrofluid length in tube within the experimental range. However, the maximum ferrofluid length in tube is restricted by the effective region of the magnetic field, which also restricts the maximum amplitude of vibration. This study is related to the development of ferrofluid actuators. The results abtained from this study are as follows ; 1) The lengths of the maintenace of ferrofluid are 40㎜, 45㎜, 87㎜ in each tube. 2) The maximum amplitude increases almost linealy with the increase of the ferrofluid length in tube with in the experimental range. 3) The natural frequency decreases with the increase of the ferrofluid length in each tube. 4) The maximum amplitude in the resonance shows higher at the low frequency band (3-8 Hz). 5) The maximum amplitude in the resonance being higher frequency band in the smaller tube diameter than in the large one.
이행남,박길문,박지만,이덕구,설재림 조선대학교 생산기술연구소 2003 生産技術硏究 Vol.25 No.1
The ejector is generally used to get a low pressure and improve the flow efficiency. The flow characteristics in ejector are investigated by PIV and a numerical analysis to predict it has been performed by CFD. Physical properties are obtained for three different Reynolds numbers in experiment and numerical analysis The research is tried to analysis not only compression vacuum engine, but also substitution for pump as fluid mechanics method about ejector's mixing duct fluid character depend on Reynolds number. The good agreement between numerical analysis and experiment shows the validity of this study.