• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.639-642
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• 2003

In this paper, fatigue behavior of concrete slab tracks under railway loads by experimental method is discussed. The addition of steel fibers to concrete mix has been receiving more attention as a way of improving the crack behavior of concrete beams an slabs tacks. This study two objectives: 1) to observe the fatigue behavior of fiber reinforced concrete slab in labor, and 2) to present crack propagation and deflection of fiber reinforced concrete slab track under railway loads in the Waghauser test line. Nine beams, two slabs and one test track were experimentally tested.

• Proceedings of the Korea Concrete Institute Conference
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• 1995.10a
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• pp.273-277
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• 1995

This study presents the physical and adhesive properties of the top coated materials for concrete slab. i.e, cement based top coated materials. epoxy mortar. The purpose of this study offers the investigation of construction factors to affect the quality of the coated materials over hardened concrete. The experimental results shows that the water content 3% of sand decline the strength and adhesive properties of epoxy mortar, on the other hand, dry surface and curing for cement based material.

• 유체기계공업학회:학술대회논문집
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• 2001.11a
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• pp.83-90
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• 2001

Experimental and numerical investigations of the off·design performance of a simple channel-wedge diffuser in a small centrifugal compressor are presented. Surge and choke conditions as well as design point are considered using somewhat limited range of experimental data and also supplementary 3D CFD results. Some critical meanline design parameters' behavior is investigated numerically, to render the basis for improved modelings in the meanline performance prediction.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1997.03a
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• pp.222-225
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• 1997

This paper describes experimental investigation on the forming limit for mash-seam welded sheets. The uniaxial tensile test was conducted to evaluate the mechanical properties of weld bead. Experimental forming limit diagrams were investigated for the different thicknesses and properties of welded sheets.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.111-116
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• 1997

In this paper, the limit temperature for applying maturity method are discussed. 4 kinds of W/C in combination of 7kinds of curing temperature are selected as experimental parameters. According to the experimental results, high curing temperature and low W/C gain in strength rapidly. And maturity rule can be applied less than $30^{\cire}C$ in W/C of 30~60% in the conditions of this experiment.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2000.02a
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• pp.63-66
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• 2000

A rotating cryogenic system was designed similar to the cooling system for the rotor of a superconducting generator. The experimental rotor has an inner vessel which simulates the winding space of an actual superconducting rotor, and a torque tube of comparable design. This paper describes the evaluation of the total heat leak into the inner vessel that leads to the study of the jheat transfer characteristic of the rotating cryogenic system.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.6
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• pp.145-151
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• 1996

In sawing operation of cubic zirconia, the performance of diamond cutter blade is very dependent on the blade variables. This investigation presents experimental results which show the effects of the blade variables such as concentration, grain size of diamond, types of diamond abrasives, and bond materials on the behavior of the blades. Based on the experimental results an optimum blade condition for the sawing of cubic zirconia was recommended.

• Molecules and Cells
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• v.28 no.2
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• pp.81-85
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• 2009

$Na^+-H^+$ exchanger (NHE) is the main acid extruder in cardiac myocytes. We review the experimental findings of ion-dependency of NHE activity, and the mathematical modeling developed so far. In spite of extensive investigation, many unsolved questions still remain. We consider that the precise description of NHE activity with mathematical models elucidates the roles of NHE in maintaining ionic homeostasis, especially under pathophysiological conditions.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1997.10a
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• pp.72-75
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• 1997

In this paper, the forming limits of laser welded blank sheets are introduced, obtained from a tensile test and a hemispherical dome punch test. Especially, the forming limit diagram(FLD) on the heat affected zone with a width 2.54mm is emphasized. Also, the experimental experiences in finding specific strain conditions are discussed.

• Bulletin of the Society of Naval Architects of Korea
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• v.19 no.1
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• pp.33-39
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• 1982

An experimental investigation on the ultimate load and energy absorption of thin plates is presented, which enables the damage to ship involved in a collision to be estimated in terms of the lost kinetic energy. The derived formulae are based upon experimental analysis and compared with theoretical presentations published by some authors. A relationship is found between the absorbed energy and the volume of damaged steel plates.