• 한국도서관정보학회지
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• 제32권2호
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• pp.187-212
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• 2001

지식과 정보는 오늘날 무한한 경제적, 사회적, 개인적 가치를 지닌 자원으로 널리 인식되고 있다. 본 연구는 정보사회의 다양한 개념과 정보의 경제적 관점을 고찰하여 보고, 이를 토대로 정보주의와 정보 공유론의 정보 관점을 살펴본다. 정보의 공유를 통한 정보유통의 활성화를 보다 확대시키기 위해 정보 정책과 정보본연의 가치회복, 정보격차의 해소 및 정보공유를 위한 사회운동 등의 대안이 제시된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.126-128
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• 2004

In these days, our social infra which are computer and internet has been developed and our community has been digitalized with a large quantity information that can be sharable or productive. So we can say that older knowledge organization based on the man power is changing with automatical and intellectual aspect. Thus we have to apply this movement to get the high efficiency and the competitive power in the organization and to take the voluntaries attitude of operator with real time inputting or fast calculating speed. Beside most of developed countries are owned their power system analysis software. Like kind of this facts can affect for national reliance. So in this paper we propose that the suggestion for both field power system and IT how these can be cooperated. The note that this paper is came from the project which name is Graphics Power Flow analysis.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1998년도 춘계학술대회논문집
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• pp.179-184
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• 1998

Semi-solid forging can be applied in industry only with enough knowledge of the effects of the forming parameters related with the process and their exact control which can be obtained by empirical or numerical methods. In the current study, the effects of process variables on semi-solid forging are discussed based on mainly numerical results. Die preheating temperature, initial solid fraction of the workpiece, and die velocity were selected as process variables, and numerical analyses using a rigid-thermoviscoplastic finite element approach that considered the release of latent heat due to phase change were carried out. In the analyses, a proposed flow stress material characterization and a solid fraction updating algorithm were employed. The obtained results from numerical analysis are discussed and are compared with some experimental observations.

• 대한기계학회논문집B
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• 제28권12호
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• pp.1511-1520
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• 2004

A flow visualization of the two-dimensional rigid fling-clap motions of the flat-plate wing are performed to gain knowledge of butterfly mechanisms that might be employed by butterflies during flight. In this numerical visualization, the time-dependent Navier-Stokes equations are solved for cyclic fling and clap types of wing motion. The separation vortex pair that is developed in the fling phase of the cyclic fling and clap motion is observed to be stronger than those of the fling followed by clap and pause motion(1st cycle motion). This stronger separation vortex pair in the fling phase is attributable to the separation vortex pair of the outside space developed in the clap phase as it moves into the opening in the following fling phase. Accordingly, higher lift and power expenditure coefficients in the fling after clap phase is caused by the stronger separation vortex pair.

• 한국연소학회지
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• 제14권2호
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• pp.18-25
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• 2009

Fuel lean reburning method is very attractive way in comparison with conventional reburning method for reducing NOX. Meanwhile, the knowledge of the how flue gas re-circulated, temperature distribution and species concentration is crucial for the design and operation of an effective fuel lean reburning system. For this reason, numerical analysis of fuel lean reburning system is a very important and challenge task. In this work, the effect of fuel lean reburn system on NOX reduction has been experimentally and numerically conducted. Experimental study has been conducted with a 15kW lab scale furnace. Liquefied Petroleum Gas is used as main fuel and reburn fuel. To carry out numerical study, the finite-volume based commercial computational fluid dynamics (CFD) code FLUENT6.3 was used to simulate the reacting flow in a given laboratory furnace. Steady state, three dimensional analysis performed for turbulent reactive flow and radiative heat transfer in the furnace.

• Environmental Engineering Research
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• 제21권1호
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• pp.1-14
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• 2016

Flocculation is a widely used phase separation technique in industrial unit processes and is typically observed in many natural flow systems. Advances in colloidal chemistry over the past decades has vastly improved our understanding of this phenomenon. However, in many practical applications, process engineering still lags developments in colloidal science thereby creating a gap in knowledge. While significant progress has been made in environmental process engineering research over the past decades, there is still a need to align these two inter-dependent fields of research more closely. This paper provides a comprehensive review of the flocculation mechanism from empirical and theoretical perspective, discuss its practical applications, and examines the need and direction of future research.

• 설비공학논문집
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• 제18권12호
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• pp.999-1006
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• 2006

A study of temperature profiles in mixing zone of AHU (air handling unit) can contribute greatly to enhance performance of AHU system, so the study on the temperature distribution between RA (return air) and OA (outdoor air) is important to analyze the mixing characteristics in a mixing zone of AHU. Accordingly, the temperature profiles during RA (return air) and OA (outdoor air) supply process into mixing zone of AHU with an air mixer are studied experimentally. The effect of air mixer, OA temperature and RA/OA flow rate are studied in detail. In this study, the results show that the mixing efficiency is all high for installed the air mixer. The more OA temperature increase and OA flow rate decrease, the more mixing efficiency is high.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.371-377
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• 2008

In order to obtain fundamental knowledge of atomization, the three dimensional unsteady phenomenon of pinch off was numerically studied by developed method. Not only liquid shapes but also velocity distributions of numerical results were compared with corresponding experimental ones. They showed satisfactorily good agreement at least in a qualitative sense. The liquid jet shapes, the pressure and velocity distributions, and the inner flow structures were clarified through the comparisons of distinctly different flow fields due to presence or absence of surface tension. The condition of pinch off, which had close correlation with fluid acceleration at injection, was clearly specified.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1996년도 춘계학술발표회논문집(1)
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• pp.340-345
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• 1996

Because of limited resources of time and information processing capability during abnormal situation, diagnosis is difficult tasks in nuclear power plant (NPP) operators. Moreover since minimizing of adverse consequences according to process abnormalities is vital for the safety of NPP, introducing of diagnosis support systems have particularly emphasized. However, considerable works to develop effective diagnostic support system are not sufficiently fulfilled because of the complexity of NPP is one of the major problems. To cope with this complexity, a lot of model-based diagnosis support systems have considered and implemented worldwide. In this paper, as a prior step to development of model-based diagnosis support systems, primary side of pressurized water reactor is functionally modeled by multilevel flow modeling (MFM) concept. MFM is suitable for complex system modeling and for diagnosis of abnormalities. Furthermore, knowledge-based diagnosis process, of NPP operator could be supported because this diagnosis strategy can represent operator's one.

• 기술혁신학회지
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• 제14권1호
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• pp.1-21
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• 2011

본 논문에서는 우선 기술혁신에 있어서 과학기술 지식의 연계관계에 관한 연구동향을 몇 가지 과정에서 정리하고, 기술혁신 과정에 있어서 과학과 기술 간의 상호작용 또는 지식흐름이 어떠한 역할을 하는지를 검토한다. 이어서 과학과 기술의 지식흐름 측정을 위한 통계적 방법과 양적 지표를 검토하고 지식흐름에 있어서 인적요인의 역할을 고찰하고자 한다. 다음으로, 한국의 기술혁신이 기반하고 있는 과학기술 지식의 특성을 분야별로 분석한다. 이를 위해 미국특허청에 등록된 한국인 특허를 대상으로 이들 특허 표제면에 수록되어 있는 비특허문헌 중 과학논문에 대한 정보를 추출한 후 기술혁신 분야와 주체별로 과학지식 연계정도와 인용된 과학지식의 최신성을 규명한다. 끝으로, 예측가능한 미래에 이루어질 새로운 발전을 향한 관점에서 결론과 시사점을 도출하고자 한다. 이는 지역혁신 시스템 혹은 국가혁신 시스템이라는 맥락에서 과학연구와 기술개발 사이의 관계에 대한 복잡하고 역동적인 네트워크를 설명하고 평가하기 위해 특허에 기반을 둔, 그리고 발명자에 기반한 통계의 디자인과 활용을 위한 새로운 방향을 제안한다.