• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1997.03a
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• pp.19-24
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• 1997

The weld line location and the weld line movement in stamping with laser-tailor welded blanks(TWB) were investigated through square cup deep drawing tests. The step blank holder was introduced to form TWB of different thicknesses without wrinkling, and the non-uniform blank holding force(BHF) was enforced to control weld line movement. Test results of the blanks with shifted weld lines showed that the large portion of the thinner area could result in a large weld line movement. Careful selection of the weld line location and the BHF control should be adapted in TWB design to avoid failures and to ensure its formability.

• International Journal of Naval Architecture and Ocean Engineering
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• v.9 no.1
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• pp.66-76
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• 2017

This paper is concerned with investigating the plastic material properties of steel plate formed by line heating method, and is aimed at implementing more rational design considering the accidental limit states such as collision or grounding. For the present study, line heating test for marine grade steel plate has been carried out with varying plate thickness and heating speed, and then microscopic examination and tensile test have been carried out. From the microscopic, it is found that the grain refined zones like ferrite and pearlite are formed all around the heat affected zone. From the tensile test results, it is seen that yield strength, tensile strength, fracture strain, hardening exponent and strength coefficient vary with plate thickness and heat input quantity. The formulae relating the material properties and heat input parameter should be, therefore, derived for the design purpose considering the accidental impact loading. This paper ends with describing the extension of the present study.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2000.11a
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• pp.89-93
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• 2000

Recently many research activities on the diagnosis of stator winding insulation of large rotating machines have been reported. Capacitive couplers are widely used as sensors for on-line partial discharge (PD) measurement of high voltage rotating machines. This paper presents laboratory test to compare Stator Slot Coupler (SSC), Resistance Temperature Detector (RTD), 80 [pF] coupler and 500 [pF] coupler for on-line PD measurement of rotating machines. And a novel on-line monitoring system for an insulation diagnosis is proposed.

• Journal of the Korean Society for Railway
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• v.3 no.3
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• pp.154-160
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• 2000

The automatic/driverless operation which are great important techniques in metro railway are required to increase higher safety, greater reliability, and transport capacity. To satisfy such demands, we must have the system design and testing technique for the railway system operation. These techniques are related to the onboard train control and communication systems which include TCMS(Train Control and Monitoring System), ATO(Automatic Train Operation), ATC(Automatic Train Control), and TWC(Train to Wayside Communication). These sub-systems must be interfacing with not only each others but also the signal system on the ground. We tested the train control system on Test line that has been developed on the basis of the standardized type EMU for korea railway systems. This test line which is located in Sangju, have been constructed for testing 7 ＆ 8 line of Seoul Metro railway.

• Proceedings of the KSR Conference
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• 2000.05a
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• pp.172-179
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• 2000

The automatic/driverless operation which are great important techniques in metro railway are required to increase higher safety, greater reliability, and transport capacity. To satisfy such demands, we must have the system design iかd testing technique for the railway system operation. These techniques are related to the onboard train control and communication systems which include TCMS(Train Control md Monitoring System), ATO(Automatic train Operation), ATC(Automatic train Control), and TWC(Train to wayside communication). These sub-systems must be interfacing with not only each others but also the signal system on the ground. We tested the train control system on Test line that has been developed on the basis of the standardized type EMU for korea railway systems. This test line which is located in Sangju, have been constructed for testing 7 ＆ 8 line of Seoul Metro railway.

• Child Health Nursing Research
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• v.16 no.4
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• pp.344-351
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• 2010

Purpose: This study was done to examine effects of a discharge education program using on-line community on parenting stress, baby care confidence for mothers of premature infants and health problem of premature infants. Methods: Using a non-equivalent control group pretest-posttest quasi-experimental design, 32 participants were assigned to an experimental (17) or a control group (15). Mothers in the experimental group were introduced to the discharge education program 2 weeks before the baby was discharged. They participated in the on-line community for 4 weeks after discharge. Parenting Stress Index and Baby Care Confidence Scale were utilized for data collection. Data were analyzed using descriptive statistics, $X^2$-test, Fisher's exact test, and Mann-Whitney U test with the SPSS program 16.0 version. Results: In the experimental group, mean scores for parenting stress were lower than for the control group (Z=-3.176, p=.001), while scores for confidence in baby care were higher than for the control group (Z=-3.195, p=.001). Conclusion: Findings indicate that discharge education programs using on-line community have the positive effect of decreasing parenting stress and increasing baby care confidence for mothers and decreasing health problems for infants. Therefore utilization of the internet and online community to educate parents of premature infants is recommended.

• Journal of The Korean Association of Information Education
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• v.8 no.1
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• pp.113-125
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• 2004

A new on-line essay test system that write the articles to manuscript paper which has two hundred squares for characters, look over and correct the manuscript paper in environment of on-line network like the real essay test is designed and implemented in this thesis. Using this system, a participant can write the articles to manuscript paper, a scorer look over and can correct the articles on manuscript paper directly. When looking over and correcting manuscript paper in this system, scorer can use a pen-mouse and a tablet. To reduce the network traffic, bitmap format of the manuscript paper is compressed to JPEG format before it is transmitted to server. The system is cost-effective and has lots of advantages in efficiency and usability. Furthermore, it is expected that the developed system can be used to improve the field of on-line subjective examinations as a counterproposal.

• Journal of The Korean Association of Information Education
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• v.8 no.1
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• pp.1-13
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• 2004

A new on-line essay test system that write the articles to manuscript paper which has two hundred squares for characters, look over and correct the manuscript paper in environment of on-line network like the real essay test is designed and implemented in this thesis. Using this system, a participant can write the articles to manuscript paper, a scorer look over and can correct the articles on manuscript paper directly. When looking over and correcting manuscript paper in this system, scorer can use a pen-mouse and a tablet. To reduce the network traffic, bitmap format of the manuscript paper is compressed to JPEG format before it is transmitted to server. The system is cost-effective and has lots of advantages in efficiency and usability. Furthermore, it is expected that the developed system can be used to improve the field of on-line subjective examinations as a counterproposal.

• Journal of the Korean Society of Clothing and Textiles
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• v.31 no.2 s.161
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• pp.269-279
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• 2007

The purposes of this study were to investigate factors affecting addictive shopping behavior and to compare the factors affecting between on-line and off-line addictive shopping. Four hundred eighty-nine female college students who have purchased fashion goods on-line shopping or off-line shopping were surveyed. For data analysis, descriptive statistics, Pearson's correlations, t-test, and multiple regression analysis were used. As the results, 15.5% of respondents were revealed as addictive buyers. Approximately 18% and 13% of subjects were revealed as on-line addictive buyers and off-line addictive buyers. There were statistically significant differences between addictive buyers and non-addictive buyers regarding self-mastery, depression, stress, and impulse. Addictive consumption scores were correlated to lower self-mastery, higher depression, and higher stress. Factors such as self-mastery, stress, impulse showed differences between on-line and off-line addictive buyers. Also, there were statistically significant differences between on-line and off-line addictive buyers. Based on these results, fashion social responsibility marketing strategies and implications regarding on-line and off-line shopping addiction would be suggested.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1935-1942
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• 2011

We have tested the developed Korean tilting train in main exisiting commercial line for speed-up on cuve section to achive reduction effects of running time. We have conducted a trial run test to speed-up 30km/h on curves in Gyeongbu line successfully. Normal current train have been operated 110km/h in 600m radius. Yet, tilting train was tested 135km/h(maximum operation line speed) in same sections. We confirmed that the dynamic runing stability of train was safety by regarding wheel load and lateral force.