• Journal of Mechanical Science and Technology
• /
• 제19권3호
• /
• pp.913-923
• /
• 2005

The dynamic mixed model (DMM) combined with a box filter of Zang et. al. (1993) has been generalized for passive scalar transport and applied to large eddy simulation of turbulent channel flows with Prandtl number up to 10. Results from a priori test showed that DMM is capable of predicting both subgrid-scale (SGS) scalar flux and dissipation rather accurately for the Prandtl numbers considered. This would suggest that the favorable feature of DMM, originally developed for the velocity field, works equally well for scalar transport problem. The validity of the DMM has also been tested a posteriori. The results of the large eddy simulation showed that DMM is superior to the dynamic Smagorinsky model in the prediction of scalar field and the model performance of DMM depends to a lesser degree on the ratio of test to grid filter widths, unlike in the a priori test.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
• /
• pp.200-204
• /
• 1986

Particle size distribution in a Continuous Mixed Suspension Mixed Crystal Removal (CMSMPR) crystallizer has been analyzed using the Population Balance (PB) model. This method presents difficulties when the growth rate of crystal depends on the crystal size. Recent studies indicate that in many cases the growth rate is dependent on size when the crystal sizes are small. In this study, a Residence Time Distribution(RTD) model was proposed to take the size dependence into account together with an appropriate numerical scheme. When compared with the approximate results based on PB model, RTD model results showed improvements also a nucleation effect which is normally unimportant for steady state analysis. Start-up data for NaCl-Water-Ethanol system was compared with computed values.

• Journal of Chest Surgery
• /
• 제27권1호
• /
• pp.52-56
• /
• 1994

This is case report of total anomalous pulmonary venous return with atrial septal defect which were corrected surgically by intracardiac procedure under total cardiopulmonary bypass.Two patients were supracardiac type,cardiac and mixed type was each one.The mixed type was three years old female patient.She was diagnosed as atrial septal defect with partial anomalous pulmonary venous return[right pulmonary vein drains into superior vena cava and right atrium] and corrected as usual.After operation,she underwent exertional dyspnea and frequent tachycardia.Chest x-ray film showed pulmonary congestion.Follow up cardiac cineangiogram revealed that left pulmonary vein also anomalously drained into left innominate vein through vertical vein.Through left thoracotomy,anastomosis was successfully carried between left atrium and vertical vein without cardiopulmonary bypass and there was no sign of pulmonary artery obstruction for two years follow up.The other three patient were corrected successfully without complication and got good result.

• 한국대기환경학회지
• /
• 제11권4호
• /
• pp.373-375
• /
• 1995

In order to turn the Bag Filter to the Purse Filter, the past system that the adverse reason is removed, the input of synthetic materiality of dust and air is placed down, and the output is placed up has been improved so that any adverse effect shall not be raised. The form of filteration mechanism is changed from a cylinder from, and the dust and air is mixed to make the entry velocity and one person can velocity of the mixed materiality become lower by the use of infinity, and the reception of filteration mechanism has been made reasonably. The dust separated from the filteration mechanism is desceded down, snd the mixde materiality is ascended up. So, a cross point is formed, and a collision and a friction is occurred from its process, and at its result, dust is scattered to stick to a filter cloth, therefore, the loss of pressure shall ont be appeared by cause of the increase of dust-loading.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1998년도 가을 학술발표대회 논문집(III)
• /
• pp.940-945
• /
• 1998

Recently, serious cracking problems have been reported in this country while the process of actual massive concrete construction. he hydration heat arising from the chemical reaction of cement with water causes temperature differentials in between inside and outside of a structural member, and these temperature differentials induce thermal stresses. In this paper, we described on the practical application and quality control of the mass concrete mixed with fly-ash. This project is investigating adiabatic temperature rise test of concrete, mock-up test in the laboratory, ad B/P before placing the mass concrete in site. As a result, we can be prevent temperature cracking from the cement hydration heat of mass concrete and also can be showed up secure quality control flow chart of mass concrete.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
• /
• pp.289-292
• /
• 1994

In this paper, the equations of motion are constructed systematically for multibody systems containing closed kinematic loops. For the displacement analysis of the closed loops, we introduce a new mixed coordinates by adding to the reference coordinates, relative coordinates corresponding to the degrees of freedom of the system. The mixed coordinates makes easy derive the explicit closed form solution. The explicit functional relationship expressed in closed form is of great advantages in system dimension reduction and no need of an iterative scheme for the displacement analysis. This forms of equation are built up in the general purpose computer program for the kinematic and dynamic analysis of multiboty systems.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
• /
• pp.1390-1393
• /
• 2006

The transmittance of bare glass was enhanced up to about 20% by coating it with a PMMA (Poly Methyl Meta Acrylate) film mixed with silica gel. This lowrefractive- index film greatly reduces total reflection inevitable for bare glass, and thus will be useful for increasing the coupling-out efficiency of OLED.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
• /
• pp.83-86
• /
• 2005

The object of this experimental study is to understand the bond performance and the shear behavior of concrete mixed with hwang-toh and blast-furnace slag. Main variables were the compressive strength according to replacement level of hwang-toh and blast-furnace slag. The results revealed that up to 20$\%$ of Hwang-toh the bond and the shear strength were improved.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
• /
• pp.491-494
• /
• 2008

The hydrogen fuel and fuel cell which have high energy efficiency and low pollutant emission are getting interest as an alternative energies due to the fossil fuel exhaust, green house effect and atmospheric pollutant problems. The hydrogen gas is very effective as an alternative energy. But, if it is leaked into the air it forms the mixed gas with the air then the danger of the explosion is risen up. So, the secure the safety is mostly important. In this research, to detect the leakage of the hydrogen rapidly, added the odorant materials which don't include the sulfur component into the hydrogen gas and researched on the effect of each odorant on the performance of the fuel cell. As the results, setting the cumulation electric power on the basis and comparing the pure hydrogen, 2,3-Butanedione 5ppm mixed gas 86.1%, 5-Ethylidene-2-Norbornene 17ppm mixed gas 88.2%, Isovaleraldehyde 10ppm mixed gas 74.8%, Ethyl Isobutyrate 2.2ppm mixed gas 93.5% of performance was shown.

• 한국산학기술학회논문지
• /
• 제14권8호
• /
• pp.4058-4067
• /
• 2013

20세기 산업화가 심화되는 과정에서 산업과 주거가 분리 개발되면서 여러 문제를 발생시키고, 새로운 산업 성장에 따라 산업단지의 복합화가 요구되었다. 이와 함께 지속가능한 산업단지를 조성하기 위한 필요성도 강조되고 있다. 본 연구에서는 지속가능한 복합산업단지의 조성을 위하여 이론 고찰을 통하여 복합산업단지의 개념을 파악하고 선행연구와 전문가FGI를 통해 계획요소를 선정하였다. 그리고 국내 외 사례의 적용현황을 비교 분석하여 측면별 시사점을 도출하고 계획방향을 제시하였으며, 이를 통하여 국내 복합산업단지 조성을 위한 기초자료로 활용하는데 연구의 의의가 있다.