• Advanced Composite Materials
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• v.16 no.1
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• pp.31-44
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• 2007

The purpose of this study is to improve the examining and understanding of the bonding behavior of Fiber Reinforced Polymer (FRP) sheets bonded to concrete blocks and steel plates under fatigue loading. First, a series of experimental investigations is summarized in the paper. The fatigue behavior of bonding surface between FRP sheets and concrete is finally characterized by the conducted P-S-N diagram representing the relationship among the probability of FRP debonding (P), the bond stress amplitudes (S), and the number of cycles (N) at debonding on a semi-logarithmic scale. The different debonding modes for various fracturing surface are also investigated and evaluated.

• Journal of Environmental Science International
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• v.12 no.1
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• pp.35-40
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• 2003

With increasing population densities in cities, underground facilities and entertainment locations are proliferating at a rapid pace in efforts to maximize the use of land. The purpose of this study is to evaluate CO concentration level of subway stations having underground platforms in Busan Metropolitan City, from September to November 2000, over seven times. The places of inquiry include Yonsan-dong station, Somyon station, Busan station, Nampo-dong station and Dusil station. The samplings were conducted at three points of each station, i.e. gates, ticket gates, and platforms. The component of CO concentration is the main elements of indoor air quality evaluation. The total concentrations and average concentrations of CO were the higher at the Somyon station. The distribution of CO concentrations at each station, generally was higher at gate than ticket gates and platforms. The I/O ratios(I-platforms, 0-gates) were expressed highly than 1 at the Yonsan-dong station, Busan station, Nampo-dong station and were lower than 1 at the others.

• Journal of the Korean housing association
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• v.19 no.2
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• pp.63-72
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• 2008

In general, the function of university dormitory includes residental, educational and many other functions for students who need quite environment and energetic living life. This functions influence the residental satisfaction of university dormitory. So this study attempts to evaluate many functions of the D-university dormitory according to the residents (students) needs and satisfaction. In the present work, SPSS window version 12.0 programs Anova (duncan, scheff, T-test. etc.) was used for analysis of statistical data which obtained from survey. The field surveys carried out for a total samples of 159 residents such as male (86), female (73), in the D-university dormitory. The result appears that the most dissatisfied factor of resident was the space and facilities of wash room. and students demand that various room and program in the dormitory except main space (unit room).

• Journal of Communications and Networks
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• v.9 no.1
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• pp.67-74
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• 2007

The performance of dual diversity receivers operating over correlated Ricean fading channels is analyzed. Using a previously derived rapidly converging infinite series representation for the bivariate Ricean probability density function, analytical expressions for the statistics of dual-branch selection combining, maximal-ratio combining, and equal-gain combining output signal-to-noise ratio (SNR) are derived. These expressions are employed to obtain novel analytical formulae for the average output SNR, amount of fading, average bit error probability, and outage probability. The proposed mathematical analysis is used to study various novel performance evaluation results with parameters of interest the fading severity, average input SNRs, and the correlation coefficient. The series convergence rate is also examined verifying the fast convergence of the analytical expressions. The accuracy of most of the theoretical performance evaluation results are validated by means of computer simulations.

• International Journal of Aeronautical and Space Sciences
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• v.1 no.2
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• pp.17-21
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• 2000

In order to correct the strut interference in wind tunnel tests, image methods are conventionally used. Because of their excessive extra runs, some alternatives have been tried to reduce the extra runs. In this study, these alternatives were reviewed and checked by the strut interference evaluation with the panel code, CMARC. The present work shows that the strut interference is free from neither model configuration nor model attitude. This dependency makes the alternatives to the image method unfeasible. The 3-run image method was also evaluated. It worked well even for the exaggerated windshield. At this point, reducing the image runs by neglecting parameters affecting minor influence would be best.

• Journal of the Korean Society of Industry Convergence
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• v.10 no.1
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• pp.55-63
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• 2007

The purpose of this study is to extract the main planning factors of environment friendly apartment complex through the residents' evaluations on importance levels of the planning factors. The major findings of this study are as follows; 1) Understanding on the environment friendly apartment complex is lacking, and the satisfaction level on the living space as the environment friendly apartment is very low. 2) The residents in the low-storied apartments want the introduction of facilities for energy saving, and those in the high-storied apartments demand to develop to green area. 3) In evaluating the importance of the environment friendly planning factors and the image of the apartment complex, the guarantee of green area and the development of water friendly space are closely related with the image of the apartment complex. So, they are the planning factors that should be handled importantly.

• Journal of the Korean housing association
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• v.19 no.1
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• pp.67-77
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• 2008

In general, the function of university dormitory includes residental, educational and many other functions for students who need quite environment and energetic living life. Among these many functions, the most important function is residental function (bed room). This study attempts to evaluate the bed room environment of four university dormitories in north region of Gyeongbuk Province using resident's (students) need and satisfaction. In the present work, SPSS window version12.0 program's Anova (duncan, scheff, t-test.) was used for analysis of statistical data which obtained from survey. The field surveys carried out for a total samples of 473 residents such as AD (118), DY (159), Kw (101) and SJ (95)) types of bed room in four university dormitories. The result appears that the most dissatisfied factor of resident was personal privacy, and the most satisfied factor was the direction (location) of bed room space.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.9
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• pp.97-103
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• 2006

This paper described the design and performance evaluation of fiber optic gyro using digital closed-loop processing. For the feedback to null the gyro input rate, digital serrodyne modulation was employed, and for scale factor stabilization, the control circuits of modulation amplitude and optical power are implemented. Performance tests show that prototype fiber optic gyro has bias stability of 0.34 deg/hr, scale factor non-lineality of about 100ppm, and maximum measurement range of ${\pm}500$ deg/sec.

• Journal of the East Asian Society of Dietary Life
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• v.19 no.3
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• pp.311-315
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• 2009

The purpose of this research was to discern how consumers experience the images of sensibility vocabularies for atmosphere of family restaurants and to suggest the applications for restaurant managers and marketers by presenting words that appeal to consumers' needs and emotions. More reliable results were obtained by researching the sensibility vocabularies using free association and stimulus methods. Extracting 8 sensibility words among 28 vocabularies, we constructed the relation of evaluation concepts by using a structural equation model. Overall, the structural equation model, which is a method to select reliable sensibility vocabularies can increase the sensitivity of the model.

• Journal of the Korean Operations Research and Management Science Society
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• v.26 no.3
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• pp.1-20
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• 2001

The amount of financial information in sophisticated large data bases is huge and makes interfirm performance comparisons very difficult or at least very time consuming. The purpose of this paper is to investigate whether neural networks in the form of self-organizing maps (SOM) can be successfully employed to manage the complexity for competitive financial benchmarking. SOM is known to be very effective to visualize results by projecting multi-dimensional financial data into two-dimensional output space. Using the SOM, we overcome the problems of finding an appropriate underlying distribution and the functional form of data when structuring and analyzing a large data base, and show an efficient procedure of competitive financial benchmarking through clustering firms on two-dimensional visual space according to their respective financial competitiveness. For the empirical purpose, we analyze the data base of annual reports of 100 Korean listed companies over the years 1998, 1999, and 2000.