• Fire Protection Technology
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• s.20
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• pp.42-47
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• 1996

Prior to real fire test, theoretical of the fire resistant performance of the structural ele-ments is often less time consuming and less costly to calculate it, than to determine the perform-ance experimentally. This study is aimed at introduction of estimating methods of the fire resistant performance of the steel structural elements not by the actual fire tests but by the mathematical models.

• ETRI Journal
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• v.9 no.2
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• pp.36-47
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• 1987

We have developed three types of muldexes; they are 140Mbit/s muldex, 565Mbit/s muldex and monitor & control muldex for a 565Mbit/s optical fiber transmission system. The frame format of our own type has been constructed for the M&C muldex, and new direct and parallel reframe techniques have been invented for 140Mbit/s, and 565Mbit/s muldex. Their functions, configurations and perform ance evaluations are described here.

• Transactions of the Korean Society of Automotive Engineers
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• v.3 no.4
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• pp.1-11
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• 1995

Active suspension control for vehicles is developed to improve both ride comfort and steering stability which are in trade off relation. In this study, the modal sky-hook controller for 7 D. O. F. model is proposed to resolve the problems such as computaional power restriction and uncertainties in modeling of systems and environments. Modal sky-hook controller reduces the coupling between the modes to be controlled. The simulation result for ride comfort shows that the perform ance of the proposed controller matches that of the optimal controller. Systematic method of determining its gain is proposed. The model sky-hook controller shows the robustness to road irregularity and modeling error.

• Journal of Biomedical Engineering Research
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• v.12 no.2
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• pp.79-88
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• 1991

Semi-transparent volume rendering technique can provide 3-D visualization well by voxel level Processing and alleviate segmentation arf, ifacts compared wish the surface rendering technique. In this Paper, we consider several new schemes which can improve she Perform ance of volume rendering. A directional interpolation method is proposed to reduce the artifact due to the anisotrophic resolution in X-ray CT data. The computation time for rendering is shortened by using the depth information of the 3-D object. And also, we reduce the quantization artifacts in the rendering by introducing the opacity-dependent sampling interval to sampling in ray-tracing.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1645-1648
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• 2008

We successfully fabricated lowest-cost superior perform ance MVA LCDs with highest-yield, high transmission, high contrast-ratio, and wide viewing angle. Using the amplified intrinsic fringe field (AIFF) controlled MVA invented by Ong, we eliminated all protrusions and ITO slit geometries. We further achieved: (1) faster gray-gray response times without the over-drive technology, (2) faster tough mura, and (3) lower flicker and cross-talk in the row inversion driving schemes.

• Spatial Information Research
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• v.2 no.2
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• pp.175-188
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• 1994

A competitive learning network was proposed as unsupervised training method of remote sensing data, Its performance and computational re¬quirements were compared with conventional clustering techniques such as Se¬quential and K - Means. An airborne remote sensing data set was used to study the performance of these classifiers. The proposed algorithm required a little more computational time than the conventional techniques. However, the perform¬ance of competitive learning network algorithm was found to be slightly more than those of Sequential and K - Means clustering techniques.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.24 no.8
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• pp.1077-1084
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• 2000

In this work, a modified stage-stacking method for the performance prediction of multi-stage axial flow compressors is proposed. The method is based on a simultaneous calculation of all interstage variables (temperature, pressure, flow velocity) instead of the conventional sequential stage-by-stage scheme. The method is also very useful in simulating the effect of changing angles of the inlet guide vane and stator vanes on the compressor operating characteristics. Generalized stage performance curves are used in presenting the performance characteristics of each stage. General assumptions enable determination of flow path data and stage design performance. Performance of various real compressors is predicted and comparison between prediction and field data validates the usefulness of the present method.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.16 no.2
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• pp.176-184
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• 1987

The purpose of this research is to study the characteristics of the coefficient of perform-ance (COP) of the small absorption refrigeration system. This experimental study is performed with two selected variables, the temperature of the generator and the input temperature of the cooling water. In order to determine the input temperature of the generator which gives maximum COP, the experimental data are obtained with controlling the temperature of the generator in the range of $20-32^{\circ}C$ of the temperature of the cooling water. The range of the generator heat suppling temperature which gives maximum efficiency is about $90-95^{\circ}C.$ The temperature range depends on the characteristics of the equipment unit. The most important result in this experiment is the trends of the COP in accordance with the variation of these temperatures. This trend will furnish the informations and knowledges for designing and operating the absorption refrigerator.

• The Transactions of the Korea Information Processing Society
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• v.4 no.4
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• pp.1076-1088
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• 1997

Data repliciation techniques of distributed database a allocation methods occures to overhead to change together all repkicas for consistency maintenance at updates .In case of data migration horizontal or vertical fragment migration has caused to caused to increase data communication.In this paper we purpose batch proxessing method groups the associated items of table and stores temporary table assciated with file relication and migrations.This method increase the usagility of system buffer in distributed trancsaction processing with a number of data inputs and updates.After all,it improved the perform-ance of distributed transaction system by reducing disk I\O processing time and the cost of data cimmunication among local sites.

• Journal of the Korean Society of Costume
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• v.32
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• pp.243-259
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• 1997

The object of this research is to inform readers of the chronikal change of Military Uniform in wars how the features and colors of uniforms have been changed along with the innovations of firearms. Military uniforms can be put into two differ-ent categories which are 'Battle wear' and 'Rank wear' A battle wear features of protec-tion and user fiendliness, These features of a battle wear can possibly minimize injuries and help increase the level of battling perform-ance. On the other hand a rank wear help dis-tinguish soldiers from their ranks and posi-tions. A rank wear symbolizs the pride that soldiers take n their unit and by wearing a rank wear soldiers feel more attached to their collegues and unit. Concrete process of military uniforms is as follows. 1. As firearms were innovated corres-pondant innovation of military uniforms were also needed this innovation were in the formstructure design color etc. 2. In the beginning features of military uniforms changed toward protection and then after social status of solders rised features changed forward show-off Finally as firearms became more fortal camouflage became the most significant feature of the military uniforms. 3. During war colors of military uniforms tended to be a means of show -off and camou- flage and while not in war they functioned as symbol which represent froops and the unit is tradition. 4. Other accessaries support the perforance and the symbolical function of uniforms.