• SUVANNABHUMI
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• v.1 no.2
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• pp.43-71
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• 2009

베트남 소수민족 공동체 중 Hmong족은 중요한 구성원이라고 여겨져 왔다. 타지에서 베트남으로 이민 와서 다른 민족들과 함께 오랫동안 살아 왔지만 Hmong족은 자기의 민족문화 특색을 잘 지켜왔다. 그런데 지난 몇 년 동안 전통적인 종교와 달리 새로운 종교를 믿게 되는 방향으로 Hmong족의 심령의 종교는 많이 변하고 있다. 그 중에 특히 주목받은 것은 개신교의 유입이다. 개신교는 직접적, 간접적 선교 방법으로 Lao Cai에 있는 Hmong족 공동체에 자연스럽게 유입되었다. Lao Cai의 많은 지방에서 사람들이 개신교를 믿게 되었고 그 중에는 가족이나 종족 환경에서 강제적 선교도 일어났다. 개신교는 Hmong족의 전통문화뿐만 아니라 Hmong족의 전통 종교, 신앙에도 직접적으로 영향을 주었다. 이 글에서는 Hmong족이 살고 있는 Lao Cai 지방을 선택하여 고찰하며 Hmong족의 전통문화가치에 대한 개신교의 영향 및 원인을 살펴보기로 한다. 먼저 Hmong사람들은 전통신앙을 버리고 개신교를 믿게 되는 원인을 살펴보자. 주 원인은 다음과 같은 네 가지가 있다고 본다. -경제와 관련된 원인 -성별 불평등과 관련된 원인 -학문 수준과 정보 습득 희망과 관련된 원인 -전통문화, 심리와 민속의식과 관련된 원인 그리고 다음과 같은 두 가지 각도에서 전통문화 가치에 대한 영향을 알아보았다. 첫째는 개신교가 Hmong사람의 전통사회체제에 큰 영향을 준 점, 둘째는 개신교가 Hmong사람의 풍속습관 및 전통 신앙에 영향을 준 점이다. 개신교가 Hmong사람의 전통사회체제에 큰 영향을 준 점은 여러 방면에서 보인다. 전통적인 가치와 개신교의 새로운 규정 사이의 충돌도 있고 가족 안에서 부부의 위치상 충돌도 있다. 또한 Hmong사람들에게 전통 종족의 역할, 위치를 약화시키는 영향도 주었고 산골 마을에서 개신교를 믿는 사람들과 믿지 않은 사람들 사이에 일어난 새로운 충돌도 있다 개신교와 개신교의 교리는 역시 풍속습관과 전통신앙에 큰 영향을 주었다. 첫째는 예수의 역할이 가장 중요하고 조상 숭배나 "집에 있는 귀신 숭배"같은 것보다 강력한 것이다. 그래서 Hmong사람의 신앙, 종교는 원시적 다신교부터 일신교로 변한 것으로 보인다. 둘째는 개신교를 믿는 사람들이 Hmong족의 전통 민속축제를 점차 멀리한다. 어떤 경우에는 그 사람들이 자기 민족의 전통문화 환경을 떠나 버리는 일도 있었다. 셋째는 개신교의 교리가 Hmong족의 풍속 규정을 바꾸게 하였고 Hmong사람들이 새로운 종교의 교리를 집행시켰다. 넷째는 인간 인생 주기에 관한 풍속습관 및 민속의례들은 의례 대상보다 의례 주제를 중심으로 삼는 것으로 점차 변화했다. 대체로 개신교가 Hmong족 공동체에 유입하여 이 민족의 전통문화 가치는 변화했다. Hmong족 공동체에 오래 존재해 왔던 낙후한 습관을 개선하는 점에서 개신교는 적극적 역할을 했다. 현재 문제점은 어떻게 전통문화가치를 유지하고 새로운 종교와 같이 존재할 수 있느냐라는 문제이다. 이 문제는 다음 연구 대상이 될 것이다.

• Journal of Korean Society of Environmental Engineers
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• v.33 no.5
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• pp.368-377
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• 2011

A package type of SCR (selective catalytic reduction) system that was proposed for removing the $NO_x$ found in flue gas from the small scale of air pollution sources was evaluated. The efficiency of the SCR system is determined by the proper utilization of catalytic media installed inside of the system, and the proper distribution of flow velocity and $NH_3$ concentration in the flue gas is a crucial factor for using the catalytic media. In this study, the distributions of $NH_3$ concentration were estimated under the various arrays and shapes of AIG at the given gas flow condition. The value of RMS (%) in $NH_3$ concentration is 95.3% at co-current flow (at $0^{\circ}$) injection but it is 90.1% at the condition of counter-current flow (at $120^{\circ}$) condition, which implies the counter-current injection is more favorable. By rearranging the $NH_3$ injection flow rates based on the distribution of velocity and $NH_3$ distribution in basic calculation, the value of RMS (%) in $NH_3$ concentration was reduced to 62.8%. The enhanced effect of $NH_3$ mixing by the combined effect of arrays and shapes are complied in the study.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.5
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• pp.491-498
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• 2010

Humidification of PEM fuel cells is necessary for enhancing their performance and lifetime. In this study, a humidification system was designed and tested; the system includes an air-supply tube (inner diameter: 75 mm) through which a nozzle can be directly inserted and a cyclonic separator for the removal of water droplets. Three types of nozzles were employed to study the influence of injection pressure, air flow rate, and spray direction on the humidification performance. To evaluate the humidification performance, the concept of humidification efficiency was defined. In the absence of an external heat source, latent heat for evaporation will be supplied by the own enthalpies of water and air. Thus, the amount of water sprayed from the nozzle is the most critical factor affecting the humidification efficiency. Water droplets were efficiently removed by a cyclonic separator, but re-entrainment occurred at high air flow rates. The absolute humidity and humidification efficiency were $21.29\;kJ/kg_{da}$ and 86.57%, respectively, under the following conditions: nozzle type PJ24; spray direction angle $90^{\circ}$; injection pressure 1200 kPa; air flow rate 6000 Nlpm.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.3708-3713
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• 2015

The objective of this study is to numerically investigate the heat transfer rate for evaluating the thermal performances of the stack thermal system using the commercial software. In order to perform this, the cooling performances of the stack system for fuel cell electric vehicle were tested under both driving road conditions including the general driving road and uphill driving road and operating conditions with and without of the air conditioning system. The heat transfer rate of the stack radiator for the stack system was increased with the increase of the inlet air flow velocity. The heat transfer rate of the stack radiator increased by 105.3% at the coolant flow rate of 20 l/min and 221.3% at the coolant flow rate of 120 l/min with the increase of the air flow velocity from 2 m/s to 10 m/s. $9.45^{\circ}C$ of inlet coolant temperature of the stack radiator at the severe driving condition of the slope of 8% and velocity of 50 km/h showed higher 85.3% than $5.1^{\circ}C$ of inlet coolant temperature at the general driving condition of the slope of 0% and velocity of 120 km/h. In addition, as the fuel cell electric vehicle with the air conditioning system operation was driving under severe uphill driving condition, the radiator coolant temperature for a stable stack operation could be exceeded over $70^{\circ}C$.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.4
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• pp.580-589
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• 2019

Indonesia has a very short supply of electricity. As a solution to this problem, plans for construction of thermal power plants are increasing. Thermal power plant require the cooling water system to cool the overheated engine and equipment that accompany power generation, and the circulation water pump chamber among the cooling water system are generally designed according to the ANSI (1998) standard. In this study, the design criterion $20^{\circ}$ for the spreading angle of the ANSI (1998) of the layout of the circulating water pump chamber can not be satisfied on the K-coal thermal power plant site condition in Indonesia. Therefore, 3-D numerical model experiment was carried out to obtain a hydraulically stable flow and stable structure. The Flow-3D model was used as numerical model. In order to examine the applicability of the Flow-3D model, the flow study results around the rectangular structure of Rodi (1997) and the numerical analysis results were compared around the rectangular structures. The longitudinal velocity distribution derived from numerical analysis show good agreement. In order to satisfy the design velocity in the circulating water pump chamber, a rectangular baffle favoring velocity reduction was applied. When the approach velocity into the circulating water pump chamber was occurred 1.5 m/s ~ 2.5 m/s, the angle of the separation flow on the baffle was occurred about $15^{\circ}{\sim}20^{\circ}$. By placing the baffle below the separation flow angle downstream, the design velocity of less than 0.5 m/s was satisfied at inlet bay.

• Korean Chemical Engineering Research
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• v.59 no.4
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• pp.542-547
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• 2021

Glass lined impellers are corrosion resistant to most chemicals, including strong acids, and also have a smooth, non-stick surface, easy to clean and free from impurities in the process. Glass lined home base impeller is a multi-purpose impeller designed to stir a wide viscosity range of liquids from low viscosity fluids to high viscosity fluids, among others, cell culture, yeast culture, and beer fermentation pots, especially used for air-water system breathable stirring. The glass lining for HB impellers, which are simple in structure and competitive in performance, is essential to have upper and lower division in order to make the joint area between the impeller and shaft as small as possible. The upper and lower division of the impeller hardly affects the mixing performance, but the aeration performance. In this study, in order to optimize the shape of the Glass Lining HB impeller, a study was conducted on the effect of the angle between the upper and lower impellers, the clearance between the impellers, and the number of baffles on the aeration power. The optimal shape and baffle plate conditions for the Glass lined HB impeller were derived through the study results that the angle and the clearance between the upper and lower impellers decreased the ration of the power consumption with aeration P_g and that without aeration P₀, P_g/P₀.

• Journal of Advanced Marine Engineering and Technology
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• v.36 no.5
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• pp.635-644
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• 2012

In order to design a wave energy generating system, a 6-DOF analysis technique is applied to the three-Dimensional CFD analysis on of a floating body and the behavior is interpreted according to the nature of the incoming wave. A wave period of 5.5s & amplitude of 0.57m from Marado is chosen. 12 case of natural pitching period from 1.25 to 2.8s has been modeled. The relation between tuning factor & pitch angle for the waves generated is compared to analyze the effects of energy absorption variables, namely mass moment of inertia, angular velocity and angular acceleration. From the results obtained, we conclude that model L is the maximum power absorbed, 6kW approximately. A maximum pitch angle of 1.91 degree was attained by Model F, and the maximum displacement of nearly 0.7m was attained by Model L among models D, F and L.

• Journal of Korean Society of Transportation
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• v.20 no.4
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• pp.73-82
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• 2002

The influence of bus stops near signalized intersections is one of the important factors which cannot be negligible in the analysis of the capacity of signalized intersections. Absence of consideration of bus bay can reduce capacity and increase the time that the stop of buses block other traveling vehicles. This influence is reflected by the bus blockage adjustment factor in KHCM, but the factor does not consider the course of each bus passing the intersection. Particularly, left turn buses have more influence on the capacity than the other buses and require the minimum length of the road for lane changes. All the existing criteria can apply only to arterial roads on which mostly traffic flows are continuous. And the criteria. which can determine the optimum location and the minimum distance between a signalized intersection and a bus bay, is not prepared and the related study is insufficient. Therefore, a theoretical formula is derived in this study being based on the theories which are avaliable to apply to the situation of signalized intersections.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.165-165
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• 2011

현재 계획 또는 설계 단계에서 수행되고 있는 관거 시설의 수리계산에는 연결관 내에서의 마찰손실만을 감안하여 수행하고 있으며, 맨홀에서의 에너지 손실은 고려되지 않는 실정이다. 그러나 연결관 내부와 맨홀의 내부는 여러 가지 수리학적 조건이 다르므로 에너지 손실이 발생하게 된다(최원석과 송호면, 2002). 더욱이 직선으로 연결된 중간맨홀보다 유입관과 유출관이 $90^{\circ}$의 각도로 접합된 합류맨홀은 연결 구조상 유수교란에 의한 에너지 손실이 커질 것으로 예상됨에도 불구하고 현재 실무에서 우수 배수시설의 설계 시 직선 연결맨홀과 $90^{\circ}$ 접합맨홀의 손실을 구별하지 않고 사용하고 있는 실정이다. 그러므로 $90^{\circ}$ 접합맨홀에서 우수관거 시스템의 우수 배제 능력을 증가시켜 도심지의 침수를 방지하기 위한 관거시설의 적정 설계 기준이 필요하며, 합리적인 설계 기준을 제시하기 위하여 $90^{\circ}$ 접합맨홀 내에서의 수두 손실을 분석할 필요가 있다. 본 연구에서는 수리모형 실험의 물질적 및 시간적 한계를 극복하기 위하여 일반적으로 3차원 유체거동의 특성분석에 많이 사용되는 Fluent 6.3 모형을 이용하여 과부하 $90^{\circ}$ 접합맨홀에서의 흐름특성을 수치모의 하였으며, 맨홀 내 손실수두의 변화를 계산하여 손실계수를 산정하였다. 맨홀 및 접합 관거의 기하 모형의 격자망은 수치해석의 안정성 확보를 위하여 그림 1과 같이 6면체 격자로 구성하였다. 또한 $90^{\circ}$ 접합맨홀에서 급격한 와류에 의해 발생하는 에너지 손실을 저감하기 위하여 $90^{\circ}$ 접합맨홀의 내부 형상 및 접합 조건을 변화시켜 손실계수를 산정하였다. 수치모형의 적용 결과 맨홀 내에서의 유속변화, 수심변화 및 압력변화에 대해서는 수리모형 실험 결과와 유사한 경향을 나타내고 있으며, 수치모형에 의하여 산정된 $90^{\circ}$ 접합맨홀에서 에서의 손실계수 값과 수리모형에 의하여 산정된 손실계수 값이 거의 유사하게 나타났다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.5
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• pp.24-31
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• 2002

The effects of vortex generators, in the form of small delta-shaped tabs or thin tapes at an axi-symmetric supersonic nozzle exit, on the characteristics of supersonic jet flowfields are investigated by Schlieren images and Pitot-tube measurements. Small tabs as small as 1 % of the nozzle exit area can introduce streamwise vortices and produce a significant effect on the jet flowfield downstream of the nozzle. The effect is stronger for the cases of under-expanded jet than over- and perfect-expanded cases, introducing a larger flow entrainment. The effects of the angle of tabs with respect to the flow direction are also investigated, and for over-expanded jet cases, it is found that the tabs bended toward upstream can weaken the interaction strength and remove the Mach disc in the jet flowfield. Introduction of small proturbances inside the nozzle surface by attachment of thin tapes is also found to change the pressure distribution in the circumferential direction of the flowfield. Its effect is also found to be dependent on the jet expansion ratio.