• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 1997년도 춘계학술대회논문집
• /
• pp.19-24
• /
• 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
• /
• 제9권1호
• /
• pp.66-76
• /
• 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.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 2000년도 학술대회논문집
• /
• pp.89-93
• /
• 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.

• 한국철도학회논문집
• /
• 제3권3호
• /
• pp.154-160
• /
• 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.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2000년도 춘계학술대회 논문집
• /
• pp.172-179
• /
• 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
• /
• 제16권4호
• /
• pp.344-351
• /
• 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.

• 정보교육학회논문지
• /
• 제8권1호
• /
• pp.113-125
• /
• 2004

본 논문에서는 실제 학생들이 논술시험을 치르는 것과 유사하게, 온라인 상에서 200자 원고지를 이용하여 논술을 작성하고 작성된 원고지 위에 첨삭지도를 할 수 있도록 하는 온라인 논술시험 시스템을 설계 및 구현하였다. 온라인 논술시험 시스템의 주요기능은 응시자가 주어진 논술문제에 대한 논술답안을 작성하여 원고지로 전환하여 제출하고, 채점자는 제출된 원고지 위에 직접 첨삭지도를 한다. 제안된 시스템에서 채점자는 펜 마우스와 타블렛을 이용하여 첨삭지도를 하고, 네트워크의 트래픽을 줄이기 위해서 원고지 그림을 JPEG형태로 압축하여 서버로 전송한다. 이 시스템은 비용이 적게 들고, 효율성, 사용성 면에서 상당한 이점이 있다. 나아가 온라인 주관식시험의 한 대안으로 발전 가능하리라 기대한다.

• 정보교육학회논문지
• /
• 제8권1호
• /
• pp.1-13
• /
• 2004

본 논문에서는 실제 학생들이 논술시험을 치르는 것과 유사하게, 온라인 상에서 200자 원고지를 이용하여 논술을 작성하고 작성된 원고지 위에 첨삭지도를 할 수 있도록 하는 온라인 논술시험 시스템을 설계 및 구현하였다. 온라인 논술시험 시스템의 주요기능은 응시자가 주어진 논술문제에 대한 논술답안을 작성하여 원고지로 전환하여 제출하고, 채점자는 제출된 원고지 위에 직접 첨삭지도를 한다. 제안된 시스템에서 채점자는 펜 마우스와 타블렛을 이용하여 첨삭지도를 하고, 네트워크의 트래픽을 줄이기 위해서 원고지 그림을 JPEG형태로 압축하여 서버로 전송한다. 이 시스템은 비용이 적게 들고, 효율성, 사용성 면에서 상당한 이점이 있다. 나아가 온라인 주관식시험의 한 대안으로 발전 가능하리라 기대한다.

• 한국의류학회지
• /
• 제31권2호
• /
• pp.269-279
• /
• 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.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.1935-1942
• /
• 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.