• Proceedings of the Korea Concrete Institute Conference
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• 1999.04a
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• pp.537-542
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• 1999

The design methodologies for carbon fiber sheet(CFS) strengthening of RC structures are not well established yet because the structural behavior of strengthened RC structures is more complex than that of unstrengthened ones. Even though the research for the methods using CFS has beed studied, the strengthening effects and structural behaviors of strengthened structures are not systematized yet. The purpose of this study is to carry out the experimental studies on three kinds of half scale RC slab bridges and to investigate the behavior of RC slab bridges from the experimental results. Typical flexural failure occurs in the non-strengthening slab like general RC slab bridges, and also the flexural failure occurs in the all area strengthened slab with sudden rip-off failure of strengthening material by punching shear. For the case of strip type strengthened slab, flexural failure occurs, with rip-off of second strip at the base of loading point. Strengthening effect on the slab using CFS is that the strength is increased upto 7~15 percent and the crack pattern is changed.

• Fashion & Textile Research Journal
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• v.1 no.4
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• pp.370-375
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• 1999

The aims of this research were to suppose the basic data to the producer for more useful manufactures production. 700 pieces of questionnaire were made and 552 pieces of questionnaire were used for this study. The results of this research are as follows ; Many consumers feel uncomfortable to using the unfinished clothing and by the point we could expect the shape retention finish has great possibilities. Just half percent of the people knew about the shape retention finish. So the producer have to do more advertisement for the shape retention finishing and functions. Generally the consumers are satisfied with the shape retention finished clothing.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.04a
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• pp.751-756
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• 2000

The structural behavior of reinforced concrete slabs strengthened by glass fiber reinforced plastic-panels experimentally investigated. The experimental variables are strengthening length, strengthening width, and pre-crack existence. The pre-cracked slabs are initially loaded to 70 percent of ultimate flexural capacity and subsequently repaired with GFRP-Panels bonded to the tension face of the slabs. Five one-way slabs were tested to failure. The main failure mode of strengthened slabs is separation failure by crack propagation from load point section to end of plate. The behavior of strengthened slabs is represented by a maximum load, load-deflection curves an load-strain curves.

• Journal of the Korea Institute of Building Construction
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• v.4 no.3
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• pp.153-159
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• 2004

The brand value of apartment which affects not only sale percent and profit but also the worth of real estate is raised as an important point of sale competition in the apartment market. But now the market is occupied by a few construction companies, which have well recognized brand. So it's difficult for a construction company without brand to enter the apartment market because of consumer's ignorance. domestic construction companies are spending lots of money and effort to advertise their characteristic brandapartment based on classified consumer's desire and offer consumers what they want. Therefor, This study investigated the factors of recently characteristic brandapartment focusing on design, environment, materials, home automation and surveyed residents preference of a brand by P.O.E methods. Based on such results of survey, this study suggest the basically reference information on characteristic strategy of an brandapartment.

• Journal of Korean Society for Atmospheric Environment
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• v.17 no.E4
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• pp.169-181
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• 2001

To test the compatibility of differential optical absorption spectroscopy (DOAS) and conventional in-situ monitoring technique we conducted a comparative analysis of the two systems using hourly measurement data sets of three criteria pollutants including No$_{2}$O$_{3}$, and SO$_{2}$ collected in months between April and June of 2001 at Sung Man city, Kyung Gi Province, Korea. The results of our comparative analysis were useful to evaluate the various aspects of DOAS performance, of particular the level of agreement with the counterpart method through computation of percent differences and correlation analysis. Interpretation of the mixing ratio data for those chemical species was however confined in terms of explaining the differences affected by the changes in environmental conditions because measurements of important meteorological parameters were limited during most of the study period. Nevertheless, the overall results of this study strongly demonstrated that the mixing ratio of major pollutants measured by the two different systems maintain strong compatibility from various respects.

• Journal of Biomedical Engineering Research
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• v.11 no.1
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• pp.113-120
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• 1990

In this paper, the deconvolution method utilizing a modified Wiener filter is applied for the enhancement of lateral resolution of ultrasonic B-scan Images. For this purpose, a phantom composed of wires which are 0.6mm of diameter and apart in the range between 3 to 9mm is constructed. The modified Wiener filter with optimal parameter is applied to the phantom for the analysis of ultrasonic image. The results obtained are as follows'When all parameters of the modified Wiener filter are optimal, the resolution of B-scan images is enhanced by 50 percent : Othenrise, the images are blurred, spilt at peak points, or noises are strengthened severely. When the point-spread function representing the characteristic function of the system is determined, the selection ranges of op- timum parameters may be narrowed. It is expected that the proposed method may be able to apply to clinic situations for more accurate image analysis by means of reducing the loss of important information.

• Journal of the Korean Institute of Educational Facilities
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• v.2 no.3
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• pp.19-30
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• 1995

The primary purpose of this study is to suggest the policy for the effective utilization of empty classrooms in elementary school. The empty classroom in this study means the classroom that is not used now since the number of students decreases, but can be usable for other needs in future. The following results are obtained through this survey; 1) about forty percent of classrooms are empty classrooms, 2) the ratio of empty classrooms is higher in urban area than rural area, 3) the smaller the size of classroom is, the higher the ratio is, and 4) 56.5% of the schools have one to three empty classrooms and 30.0% have four to six empty classrooms. In conclusion it is suggested that 1) the reutilization plan of empty classrooms be established according to particular situation of each school, 2) the government develop the guidelines for reutilization and administrative procedures for renewal, 3) the reutilization plan be established from the view point of the quality improvement of schooling, and 4) the enlargement and rearranagemt of learning space be considerd when reutilization is planned.

• Journal of Korea Port Economic Association
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• v.18 no.1
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• pp.135-157
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• 2002

The fact that Pyeongtaek Port is located ideally at the central point of the Yellow Sea's Economic Zone and it is very close to the metropolitan area of South Korea which occupies more than 50 percent of the total trade volume in terms of tonnage is providing a good prospect of development for the Port of Pyeongtaek. This study examines the perception of shippers in Kyonggi-do on the development of Pyeongtaek Port, giving some suggestions to the Pyeongtaek Port Authority. It begins with a description of the port such as current economic status, statistics on the economy, trade and investment regarding the Port of Pyeongtaek. According to a particular questionnaire survey conducted in December 2001, the major obstacles to the utilization of the port are as follows: a shortage of liner shipping routes, lack of container handling facilities including container terminal, crane etc., and port sales promotion activity. Therefore the port should make aggressive efforts to attract container cargoes to and from China by expanding port facilities, implementing effective marketing strategies, introducing a customs-free zone/free trade zone, and strengthening port sales etc.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.6 no.2
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• pp.93-102
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• 1994

It is the goal of this study to provide the essential data for design and operation of optimum water supply system. Experimental and theoretical analyses have been conducted for various parameters, for example, volume and air percent of pressurizing tank, pump speed and pressure range inside tank, etc. Pressure inside tank with time, flow rate, energy consumption rate and pump operation time have been obtained for design and operating parameters to optimize the components and to establish the operating method of system, and therefore to contribute to the development of technology from a point of view of the improvement of quality, the enhancement of system efficiency and the reduction of construction cost.

• Proceedings of the SAREK Conference
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• 2008.06a
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• pp.1201-1206
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• 2008

Psychrometric chart displays graphically the thermophysical properties of moist air, so it is very conveniently used in air-conditioning and refrigeration. On general psychrometric chart, there are dry bulb temperature, web bulb temperature, absolute humidity ratio, relative humidity, specific enthalpy, specific volume, sensible heat factor, and enthalpy-humidity difference ratio. However, various state and process values besides aboves can be plotted on psychrometric chart. In this study, we developed the software drawing twenty kinds of lines, that is vapor pressure, mole fraction ratio of vapor, dew point temperature, degree of saturation, density, specific entropy, specific exergy, contact or bypass factor, uncomfort index, discomposition index, predicted mean vote index, predicted percent dissatisfied, and so on. We wish to this software is a help to design, analysis and education.