• Structural Engineering and Mechanics
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• v.11 no.6
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• pp.651-662
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• 2001

In order to investigate the seismic behavior and seismic design methods in the transverse direction of a shield tunnel, a series of model shaking table tests and a two-dimensional finite element dynamic analysis on the tests are carried out. Two kinds of static analytical methods based on ground-tunnel composite finite element model and beam-spring element model are proposed, and the validity of the static analyses is verified by model shaking table tests. The investigation concerns the dynamic response behavior of a tunnel and the ground, the interaction between the tunnel and ground, and an evaluation of different seismic design methods. Results of the investigation indicate that the shield tunnel follows the surrounding ground in displacement and dynamic characteristics in the transverse direction; also, the static analytical methods proposed by the authors can be used directly as the seismic design methods in the transverse direction of a shield tunnel.

• Journal of Information Technology Applications and Management
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• v.18 no.4
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• pp.131-148
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• 2011

Our work empirically investigates the cultural differences of Social Networking Service (SNS) users in China, Korea and U.S. We construct a survey questionnaire from existing literature and test it for reliability, validity, and model fit. Then we collect data and validate the cultural differences of SNS users in three nations. Our results show different rankings from existing literature in cultural dimensions about three nations. In terms of masculinity, we find China > U.S. > Korea, similar to Hofstede. In individualism, we find U.S. > Korea > China, different from Hofstede (U.S. > China > Korea). In power distance, it is shown that Korea > China > U.S., different from Hofstede (China > Korea > U.S.). Uncertainty avoidance is found that U.S. > Korea > China, lowered ranking of Korea from the top among three nations in Hofstede. We find that these outcomes would be useful in updating national culture of the three nations and for future research about cultural impacts on SNS adoption.

• Proceedings of the KSPS conference
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• 2002.11a
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• pp.141-144
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• 2002

The relations between words intelligibility and sentences intelligibility were tested on adults with cerebral palsy(athetoid type). Intelligibility is used as an important evaluation value in the field of diagnosis and therapy of dysarthric patients. In order to develop one syllable phonetic contrast intelligibility test using specific phonetic contrasts, the correlation with sentences intelligibility was tested to find out the validity. Pearson's simple correlation coefficient was .83 that shows a high correlation. Also, comparing the range and standard deviation given by seven evaluators on each subject, it was shown that when evaluating patients of moderate intelligibility, words intelligibility was more reliable than sentences intelligibility.

• Korean Journal of Child Studies
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• v.28 no.1
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• pp.37-54
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• 2007

The purpose of this study was the development and validation of a test of young children's understanding and their ability to represent the elements of traditional Korean music. The test was reviewed by professional groups and modified by preliminary testing. In its final form, the Korean Traditional Music Ability Test(KTMAT) for 4- to 6-year-old children consists of 43 items covering understanding and ability to represent Changdan(Changdanhyung, Bak, Bbareugi and Semyeorim) and Garak(Eumjeong and Sikimshae). Item analysis, reliability and validity tests were statistically significant. The KTMAT is an evaluation tool that can be used as basic material for developing children's musical ability, and it can provide valuable information showing direction for children's Korean traditional music education.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.31B no.3
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• pp.24-38
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• 1994

In this paper we develop the software simulator written in a C language for a frequency modulation synthesis and the approximate range of parameters, for a musically satisfactory timbre, obtained by using the software simulator will be applied to develop an algorithm for parameter extraction. For a frequency modulation synthesis, we also develop an algorithm for parameter extraction through waveform analysis in the time domain as well as spectrum analysis using a FFT in the frequency domain. To verify the validity of the developed algorithm as well as software simulator experimentally, we extract parameters for the several music instruments using the suggested algorithm and analyze the synthesized sound by applying the parameters to the software simulator. The evaluation of the synthesized sound is first done by listening the sound directly as a subjective testing. Secondly, to evaluate the synthesized sound objectively with an engineering sense, we compare the synthesized sound with an original one in a time domain and a frequency domain.

• Journal of Nutrition and Health
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• v.28 no.8
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• pp.717-726
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• 1995

This study was to investigate the validity of energy measurement system by using different body size and sex of rats and feed supplementation methods. There appeared no statistical differences in energy(AME, AMEn) utilization between male and female rats with average 200g body weight, and between male rat of 200g and 300g body weight. Glucose replacing corn in the basal diet or replacing diet itself at a level of 30% by weight appeared to have the same metabolizable energy value, suggesting that either methods to supplement test ingredient brought about the same results. Consequently, following suggestions could be made from results of present study : first, Sprague-Dawley rate of either sex weighing 200-300g may be used as an animal model to obtain in vivo metabolizable energy from dietary carbo-hydrates or sea foods. Second, the testing ingredients may be added at the expence of corn in the basal diet at 30% level.

• International Journal of Safety
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• v.4 no.2
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• pp.6-11
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• 2005

The goals of the paper are to understand the impact damage behavior and identify the effect of surface protective materials on impact resistance in filament wound composite pressure vessels. For these, a series of low velocity impact tests was performed on specimens cutting from the full scale pressure vessel by the instrumented impact testing machine. The specimens are classified into two types, which are with and without surface protective material. The visualization for impact damage by two different impactors is made by metallurgical microscope. Based on the impact force history and damage, the impact resistance parameters were employed,rod its validity in identifying the damage resistance of filament wound composite pressure vessel was reviewed. As the results, the impact resistance of the filament wound composites and its dependency on the surface protective material were evaluated quantitatively

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2002.11a
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• pp.277-279
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• 2002

This paper is an experimental research of the design of a cell battery charger using switching methods. The developed charger in this paper can do both the equalizing current charge and floating charge. Also, it is easily transferable. Power MOS FET was used for the full bridge converter of the charger, and ZVS was applied for the switching method of the converter. Also, Customized IC was used for the control circuit in order to simplify ZVS mode. The setting current and floating current used for the charger were designed by using OP AMP. Based on the process provided by the current research, a sample converter with the power rating of 5KVA was developed and is field-testing to improve its validity and stability.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.11
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• pp.1813-1819
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• 2016

In this paper, LS-SynRM (Line Start-Synchronous Reluctance Motor) has been attracting attention in replace of induction motor which hardly provides high efficiency. Compared to induction motor, LS-SynRM has better efficiency per unit area. This study demonstrated the electromagnetic design methods of LS-SynRM while maintaining the frame of existing IE3 induction motor for blower. We documented the design procedures for generating high saliency which is the most essential and mechanical stress analysis is also treated. In conclusion, we proved the validity of our design by manufacturing and testing our LS-SynRM models.

• Journal of the Korean Society of Clothing and Textiles
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• v.16 no.1 s.41
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• pp.53-63
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• 1992

The purpose of this study is to investigate the method of trace gas technique by G.C and the effects of the type of blouse on ventilation. The experimental system employed a trace gas technique in which ventilation was monitored to determine oxigen exchange rate. The experimental variables were tested with three types of blouse depending on the sizes of neckline, armhole and waist line. Exercise conditions include standing and walking position. The results and discussion forcused on the construct validity of the apparatus/testing protocol. the effect of experimental variables on ventilation was also discussed.