• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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• pp.96-102
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• 2008

For centuries now, wind tunnels have been a key element in scientific research in a number of fields. Experimenting with racecars, airplanes, weather patterns, birds, and various other areas has been made much easier because of its development. In the racing field, for example, the information gathered from this testing can mean the difference between winning and losing a race. Weather simulations can also provide valuable information regarding building stability and safety. This has become very important when designing buildings today. Valuable information concerning bird flight has also been collected based on wind tunnel testing. Wind tunnels have a variety of important uses in the world today. Wind tunnel that used here is an open loop low speed wind tunnel. The fundamental principles of this tunnel is moving the air using exhaust fan In the rear side, and placing the cube in the external balance system which used to measure the working force. This experiment is using 50mm cube of finished wood. From this experiment we can get Drag Force (FD), The Reynolds Number (Re) and The Coefficient of Brae (CD).

• 한국정밀공학회지
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• 제29권6호
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• pp.613-620
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• 2012

Rails are subjected to damage from rolling contact fatigue, which leads to defects such as cracks. Rolling contact fatigue damages on the surface of rail such as head check, squats are one of growing problems. Another form of rail surface damage, known as "Ballast imprint" has become apparent. This form of damage is associated with ballast particles becoming trapped between the wheel and the surface of rail. These defects are still one of the key reasons for rail maintenance and replacement. In this study, we have investigated whether the ballast imprint is an initiator of head check type cracks and effect of defect size using Finite element analysis. The FE analysis were used to investigate stresses and strains in subsurface of defects according to variation of defect size. Based on loading cycles obtained from FE analysis, fatigue analysis for each point was carried out.

• 한국음향학회지
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• 제18권3호
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• pp.43-48
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• 1999

IDDQ 테스트는 CMOS 소자로 구성된 회로에서 기능 테스트로는 검출할 수 없는 결함을 찾아내어 회로의 신뢰성을 높여주는 전류테스트 방식이다. 본 논문에서는 IDDQ 테스트를 테스트 대상 칩 내에서 수행할 수 있는 내장전류감지(Built-In Current Sensor : BICS)회로를 설계하였다. 이 회로는 메모리의 IDDQ 테스트를 수행할 수 있도록 설계되었으며, 적은 트랜지스터를 사용하여 빠른 시간 내에 테스트를 수행할 수 있도록 구현하였다.

• Wind and Structures
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• 제35권3호
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• pp.147-155
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• 2022

This research proposes a wind-lens turbine design that can startup and operate at a low wind speed (< 5m/s). The performance of the wind-lens turbine was investigated using CFD and wind tunnel testing. The wind-lens turbine consists of a 3-bladed horizontal axis wind turbine with a diameter of 0.6m and a diffuser-shaped shroud that uses the suction side of the thin airfoil SD2030 as a cross-section profile. The performance of the 3-bladed wind-lens turbine was then compared to the two-bladed rotor configuration while keeping the blade geometry the same. The 3-bladed wind-lens turbine successfully startup at 1m/s and produced a torque of 66% higher than the bare turbine, while the two-bladed wind-lens turbine startup at less than 4m/s and produced a torque of 186 % higher than the two-bladed bare turbine at the design point. Findings testify that adding the wind-lens could improve the bare turbine's performance at low wind speed.

• 대한전자공학회논문지SD
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• 제45권9호
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• pp.33-40
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• 2008

메모리의 속도가 빠르게 향상됨에 따라, 고속 메모리를 테스트하기 위한 테스트 장비가 요구되고 있다. 특히 고속 메모리를 사용자가 원하는 명령어를 그대로 사용하여 효율적으로 테스트할 수 있도록 패턴을 만들어 내는 알고리즘 패턴 생성기(ALPG)가 필요하다. 본 논문에서는 고속 메모리 테스트를 위한 새로운 병렬 ALPG를 제안한다. 제안하는 ALPG는 명령어 분석기를 통해 사용자가 실행하고자 하는 명령어를 그대로 사용하여 고속 메모리 테스트를 위한 패턴을 생성할 수 있다.

• 비파괴검사학회지
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• 제33권3호
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• pp.283-288
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• 2013

This paper describes development of a high speed Doppler OFDI system for non-invasive vascular imaging. Doppler OFDI (optical frequency domain imaging) is one of the phase-resolved second generation OCT (optical coherence tomography) techniques for high resolution imaging of moving elements in biological tissues. To achieve a phase-resolved imaging, two temporally separated measurements are required. In a conventional Doppler OCT, a pair of massively oversampled successive A-lines is used to minimize de-correlation noise at the expense of significant imaging speed reduction. To minimize a de-correlation noise between targeted two measurements without suffering from significant imaging speed reduction, several methods have been developed such as an optimized scanning pattern and polarization multiplexed dual beam scanning. This research represent novel imaging technique using frequency multiplexed dual beam illumination to measure exactly same position with aimed time interval. Developed system has been verified using a tissue phantom and mouse vessel imaging.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1996년도 제24회 춘계학술대회
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• pp.86-93
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• 1996

The lubrication characteristics of high-speed ball bearings has been investigated empirically using 45mm bore split inner ring ball bearings employed in small industrial gas turbine engines with oil-jet lubrication method. For the close structural simulation, experiments carried out with bearing mounting supports of real engines, such as bearing housings and oil nozzle assemblies with squeeze film dampers. Thus the results of tests can be directly applied to the design and the development of gas turbine engines. Testing was done by varying operating speeds, axial load on bearings, and lubricant flowrates. During testing, the temperature of bearing at outer-ring face, the power consumption of the driving motor, and the rotating resistance of the bearing were measured. From this study, the representative factors for lubrication characteristics at high speed was found, and the most important one was not operating speed but axial load up to 1.95 million dmN speed and 303 kgf axial load. Furthermore, the detailed variation of the rotational resistance of the bearing could be visualized by measuring the change of the radial load under the bearing supports. The rotational resistance consists of the frictional resistance and the bearing-cavity oil resistance.

• 한국산업융합학회 논문집
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• 제25권3호
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• pp.379-386
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• 2022

The goal of this research is to verify a performance test system for a low speed, high torque, and harsh reducer at low cost. The reducer rotates a cooling fan with a diameter of 10 meters, in a high temperature (50℃) cooling tower in a geothermal power plant. It requires about 500 kgf·m torque and 47.75 kW power to rotate the fan at a maximum power condition. An expensive dynamometer is commonly used for performance test of a motor or a reducer. In this paper, a low cost system is developed using a hydraulic pump as a load unit to generate torque instead of a dynamometer. We accurately calculated the required power, the flow meter, and the pressure of the pump, and selected to design and optimize the system at minimal cost. The system also applied another reverse reducer and a gearbox to increase the rotational speed and to reduce the torque from the low speed and high torque target reducer. This allows low-cost systems to be built using inexpensive components. The developed system was able to successfully measure the high torque and the low rotational speed of the target reducer at high temperature.

• Wind and Structures
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• 제19권2호
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• pp.145-167
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• 2014

Wind-vehicle-bridge (WVB) interaction can be regarded as a coupled vibration system. Aerodynamic forces and moment on vehicles and bridge decks play an important role in the vibration analysis of the coupled WVB system. High-speed vehicle motion has certain effects on the aerodynamic characteristics of a vehicle-bridge system under crosswinds, but it is not taken into account in most previous studies. In this study, a new testing system with a moving vehicle model was developed to directly measure the aerodynamic forces and moment on the vehicle and bridge deck when the vehicle model moved on the bridge deck under crosswinds in a large wind tunnel. The testing system, with a total length of 18.0 m, consisted of three main parts: vehicle-bridge model system, motion system and signal measuring system. The wind speed, vehicle speed, test objects and relative position of the vehicle to the bridge deck could be easily altered for different test cases. The aerodynamic forces and moment on the moving vehicle and bridge deck were measured utilizing the new testing system. The effects of the vehicle speed, wind yaw angle, rail track position and vehicle type on the aerodynamic characteristics of the vehicle and bridge deck were investigated. In addition, a data processing method was proposed according to the characteristics of the dynamic testing signals to determine the variations of aerodynamic forces and moment on the moving vehicle and bridge deck. Three-car and single-car models were employed as the moving rail vehicle model and road vehicle model, respectively. The results indicate that the drag and lift coefficients of the vehicle tend to increase with the increase of the vehicle speed and the decrease of the resultant wind yaw angle and that the vehicle speed has more significant effect on the aerodynamic coefficients of the single-car model than on those of the three-car model. This study also reveals that the aerodynamic coefficients of the vehicle and bridge deck are strongly influenced by the rail track positions, while the aerodynamic coefficients of the bridge deck are insensitive to the vehicle speed or resultant wind yaw angle.

• Journal of the Korean Wood Science and Technology
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• 제28권2호
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• pp.10-18
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• 2000

초음파를 이용한 목재의 비파괴시험은 등급구분 수분 및 결점 탐지, 썩은 정도 평가 등의 용도에 적용되고 있다. 이와 같은 기술을 실제로 적용하기 위해서는 목재 내의 초음파 전달과 목재의 성질 사이의 관계에 대한 기본적인 연구가 선행되어야 한다. 이 연구에서는 함수율과 섬유경사각이 초음파 전달 속도에 미치는 영향을 분석하기 위하여 낙엽송과 소나무를 대상으로 초음파 비파괴시험을 실시하였다. 함수율에 대한 시험을 위한 시험편은 생재상태, 30%, 20%, 10% 및 전건상태의 함수율을 갖도록 준비하였고 섬유경사각에 대한 시험을 위해서는 접선방향으로 0, 15, 30, 45, 60, 75 및 90도의 섬유경사각을 갖는 시험편을 준비하였다. 초음파 전달 속도는 섬유포화점에 근사한 30% 이하의 낮은 함수율 범위에서는 함수율에 반비례하였으며 이보다 높은 함수율 범위에서는 함수율에 관계없이 일정한 경향을 나타내었다. 목재의 압축강도와 함수율 사이의 관계에서도 이와 유사한 경향이 관찰되었다. 목재의 섬유경사각도 초음파 전달 속도 및 압축강도와 반비례하는 경향을 나타내었다. 압축강도와 초음파 전달 속도 사이의 관계는 정비례하는 관계로서 하나의 직선식으로 나타낼 수 있었다.