• Journal of the Korean BIBLIA Society for library and Information Science
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• v.26 no.1
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• pp.77-100
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• 2015

Air Force library performs the functions of a library with respect to a specific group of Air Force. However, the development of Air Force library is beginning step, its facilities and services are not meet expectations. The analysis of operating status for entire Air Force libraries is so far not attempted. Focusing on this point, this study analysed for the first time evaluation regarding the overall operating status and activation of Air Force libraries at the levels of wing, group and squadron. The questionnaire was consisted of a total of 45 questions. The questionnaire was distributed to 101 Air Force libraries registered in currently August 2014. I was received the reply from 81 out of 101 Air Force libraries, but the responses of 4 libraries were poor, and analyzed the total 77 library responses excluding them. As the results of the analysis, this paper identified operational status and perception of activation of Air Force libraries as a whole, and pointed out the problems that have been identified regarding the operation of these libraries. Furthermore, this paper suggested concretely activation plan for the development of Air Force libraries.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11a
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• pp.380.2-380
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• 2002

SRM(Switched Reluctance Motor) 내부의 Radial Force는 소음ㆍ진동의 주원인이 되는 가진력으로 작용하는 것으로 알려져 있다. 따라서 본 논문에서는 Radial Force의 주 요인인 Motor 내부의 Air Gap 편심에 따른 반경방향의 전자기 가진력을 전자장 수치해석을 통하여 해석하고 소음ㆍ진동에 미치는 영향을 분석하였다. Air Gap 편심량을 변화시켜 가면서 Stator, Rotor의 Local Force와 Gloval Force인 Torque Fluctuation을 해석하고 이를 실험 결과와 비교함으로서 해석결과의 타당성을 입증하였다.

• Proceedings of the Korean Society of Toxicology Conference
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• 2003.10b
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• pp.162-162
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• 2003

The psychological and biochemical stress responses of healthy men and women were measured under the normal situation. Experimental subjects, who were cadets of the Korea Air Force Academy, were selected by the random sampling. Quantitative scaling of the psychological stress was obtained by life stress test(Cheon et al, 2000) and Minnesota Multiphasic Personality Inventory(MMPI).(omitted)

• Proceedings of the Korea Environmental Mutagen Society Conference
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• 2003.10a
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• pp.162-162
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• 2003

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.2
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• pp.278-284
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• 2009

The global force and interaction body force density were evaluated in permanent magnets by using the virtual air-gap scheme incorporating the finite-element method. Until now, the virtual air-gap concept has been successfully applied to calculate a contact force and a body force density in soft magnetic materials. These force calculating methods have been called as generalized methods such as the generalized magnetic charge force density method, the generalized magnetizing current force density method, and the generalized Kelvin force density method. For permanent magnets, however, there have been few research works on a contact force and a force density field. Unlike the conventional force calculating methods resulting in surface force densities, the generalized methods are novel methods of evaluating body force density. These generalized methods yield the actual total force, but their distributions have an irregularity, which seems to be random distributions of body force density. Inside permanent magnets, however, a smooth pattern was obtained in the interaction body force density, which represents the interacting force field among magnetic materials. To evaluate the interaction body force density, the intrinsic force density should be withdrawn from the total force density. Several analysis models with permanent magnets were tested to verify the proposed methods evaluating the interaction body force density and the contact force, in which the permanent magnet contacts with a soft magnetic material.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.16 no.9
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• pp.820-827
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• 2004

The propulsion force acting on a wafer in an air levitation system was measured accurately and then, the corresponding force coefficient was determined. The theoretical propulsion force on the wafer bottom surface were obtained by CFD simulations and from these results the propulsion force coefficient was deduced. The transportation velocity of a wafer was estimated by using both experimental and numerical force coefficients, for various air velocity of nozzle injection. When the numerical results are compared to the experimental data, the numerical results agree well Quantitatively.

• Journal of the Korea Institute of Military Science and Technology
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• v.15 no.3
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• pp.306-314
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• 2012

This paper proposes a new system to maximize efficiency of Air Base Protection Operations through the development of location identification software. The Wibro-based location identification system for Air Base Protection Force offers Blue Ground Force digitalized character message which is not exposed to enemy. Also, it is possible to automatically provide the location of Blue Ground Force to Air Base Ground Operations Center. The test result proves that this system is very helpful when Air Base Protection Force executes Air Base Protection Operations.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2002.10b
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• pp.281-282
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• 2002

To reduce the spin-off of lubricants on a magnetic disk, which is caused by the radial component of shear force between the disk and air, we analyzed the air-velocity distribution and the air-shear force by three-dimensional large-eddy simulation (LES). This sensitivity analysis, on five design parameters, showed that disk/arm clearance and arm thickness have a greater effect on the mean radial air-shear force than the other parameters. The force on a disk optimized according to the optimum parameters is 12% less than the force on a conventional disk.

• Journal of the Semiconductor & Display Technology
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• v.4 no.1 s.10
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• pp.35-41
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• 2005

An air levitation type wafer transfer system is composed of control and transfer track. Wafer transfer speed is mainly affected by air velocity of propulsion nozzle. In this study, the propulsion force coefficient was evaluated experimentally for the nozzle with 0.5mm, 0.8mm, and 1.0mm diameter. As a result, the propulsion force was largest in the smallest size of nozzle at same air velocity. The propulsion force coefficient of nozzle increases with reducing diameter of nozzle. This increment of propulsion force coefficient was enlarged remarkably at the 0.5mm diameter of nozzle.

• Journal of Electrical Engineering and Technology
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• v.10 no.3
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• pp.1349-1355
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• 2015

It is difficult to calculate the magnetic force of an object of magnetic material in contact with other objects using the existing methods, such as Maxwell stress tensor method, magnetic charge method, or magnetizing current method. These methods are applicable for force computation only when the object is surrounded by air. The virtual air-gap concept has been proposed for calculating the contact force. However, its application is limited to magneto-static system. In this paper, we present the virtual air-gap concept for contact surface force in the eddy-current system. Its validity and usefulness are shown by comparison between numerical and experimental examples.