• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.05a
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• pp.780-785
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• 2001

A method for accurate measurement of the contact force in the current collection system of the high-speed railway is developed. In order to measure the contact force with minimal modifications to the pantograph, strain gauges are attached to the bottom of the contact strip. An algorithm for deriving the magnitude and stagger of the contact force from the bending strain measurements is devised. For the sample pantograph, the static contact forces are measured to within ${\pm}$5 % error for the magnitude and ${\pm}$ 2cm error for the stagger. For dynamic contact force measurement, it is found that the contact strip can the regarded as a rigid body for the contact frequency of less than 15 ㎐.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.421-424
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• 2003

서울지하철은 총연장 286.9km에 1일 4226회의 운행회수 그리고 대중교통수단 중 총 34.1％의 최다 수송분담율을 담당하고 있다. 서울시의 도심교통문제 해결 방안으로 시민들에게 대중교통 이용을 적극적으로 권장하고 있으나, 지하철 역사의 환경문제는 답보 상태를 유지하고 있는 것이 현실이다. 지하철내의 먼지문제는 이미 심각한 사회문제로 대두된 지 오래이며 이를 개선하기 위하여 지하철공사와 도시철도공사에서는 환기시스템의 개선, 환기 및 공기정화시설의 설치 그리고 잦은 물청소실시 등을 시행하여 오고 있어 그간 상당한 효과를 이룬 것도 사실이다. (중략)

• Journal of the Korean Applied Science and Technology
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• v.27 no.3
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• pp.337-343
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• 2010

1-Deoxynojirimycin(1-DNJ) was hardly detected by general UV detector. Therefore, in this study, we analyzed 1-DNJ, a effective functional material in which was contained the leaves of Cudrania tricuspidata and its tea by gas-chromatography. Synthesized a TMS derivative by attaching trimethylsilyl group to 1-DNJ, analyzed this by GC, and could detect a good peak. The leaves of Cudrania tricuspidata contains $1154.83{\pm}56.67$ ug/g.d.w of 1-DNJ and tea of Cudrania tricuspidata leaves does $8.01{\pm}0.61$ ug/g.d.w. This means the contents of 1-DNJ was nearly identical to each other. The larger size of the leaves had the more contents of 1-DNJ and the middle region of collection was the highest than any other collective regions of leaves.

• Prospectives of Industrial Chemistry
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• v.21 no.2
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• pp.24-34
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• 2018

본 연구에서는 지하역사 및 터널에서 발생되는 미세먼지의 현황 및 이를 저감하기 위한 기술의 동향을 조사하였다. 지하역사 및 터널의 미세먼지 농도는 주변 대기 중의 농도보다 높은 것으로 나타났다. 그 구성 성분에 있어서 다양한 중금속 및 발암물질들을 함유하고 있고, Fe의 농도가 가장 높게 나는 것을 알 수 있었다. 지하역사 및 터널의 미세먼지 농도는 주변 대기 농도와 같은 외부 요인뿐만 아니라 열차의 운행 수, 이용 승객수, 환기량과 같은 내부 요인도 큰 영향을 미치는 것을 확인할 수 있었다. 현재 지하역사 및 터널의 미세먼지를 저감하기 위해서 다양한 기술(환기팬, 스크린도어, 자성필터, 소형제트팬, 인공지능 환기시스템 등)들이 연구되고 있으며, 그 기술들은 현장 조건에 맞추어 사용되어야 그 실효성을 극대화시킬 수 있을 것이다.

• Journal of Embryo Transfer
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• v.31 no.3
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• pp.249-254
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• 2016

It is imperious to know the reproductive parameters of the subsisting swine breed for profitable farming in Bangladesh. This study was designed to compare the reproductive parameters of sows at hilly areas between the local and crossbred at farm and backyard level. A total of 116 breedable sows were included. The data on age at puberty, litter size, birth weight, weaning weight, gestation length, interval between farrowing and number of piglets born per sow in local and crossbred sows were determined and direct questionnaire method was used for data collection. The present study revealed that age at puberty between farm and backyard system of crossbred sows was $8.88{\pm}0.153$ and $9.85{\pm}0.221$ months, respectively. The farrowing interval was shorter in crossbred sows which were kept in farming system rather than backyard system. The interval between farrowing and onset of estrus was shorter in crossbred sows. The gestation length was almost similar between backyard and farm condition. The number of litter size per sow per farrowing was $8.45{\pm}0.41$ in crossbred and $7.17{\pm}0.250$ in local pigs at backyard system. The birth weight and weaning weight were more in farm conditions than backyard system. The age at puberty in local breed was lower than the crossbred and litter size was $8.45{\pm}0.407$ in crossbred which was higher than local breed $7.17{\pm}0.250$ in backyard system. These results suggest that reproductive parameters of local sow need to be improved for better production and crossbred sows should be reared for obtaining desired productivity.

• Journal of Convergence for Information Technology
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• v.7 no.6
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• pp.19-24
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• 2017

The purpose of this study is to investigate the relationship among the Clinical learning environment, clinical practice course satisfaction and the major satisfaction of nursing students. The subjects of this study were included 118 nursing students in one area. Data collection was conducted in September 20 17, and data analysis was descriptive statistics and Pearson's correlation. The results of the study showed that the average of the Clinical learning environment was $3.32{\pm}0.41$, the average clinical practice course satisfaction was $3.88{\pm}0.55$ and the average level of satisfaction was $3.99{\pm}2.30$. Clinical Practice Environment and Clinical Practice Course Satisfaction was (r=.586, p=.000), and the Clinical Practice Course Satisfaction with Major satisfaction was (r=.560, p=.000), Clinical Learning Environment and Major Satisfaction significant positive correlation (r=.530, p=.000). In order to increase resilience, it is necessary to improve the clinical practice environment and the major satisfaction through a detailed study.

• Journal of Convergence for Information Technology
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• v.8 no.6
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• pp.31-41
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• 2018

The purpose of this study was to investigate the applicability of project - based learning as a teaching method for 'Dental Hygiene Practice' in the community dental hygiene department at G city S university. The subjects were 30 students in the fourth grade in 2018. Data collection period was from March 12 to June 27, and mean and standard deviation were compared using SPSS 20.0 program. The results of the analysis showed that the score of the team with high team performance was high ($3.91{\pm}0.82$), the students were required to practice ($4.10{\pm}0.88$), and the feedback from the professor ($3.73{\pm}0.86$) Satisfaction was high. It was determined that the application of project - based learning classes in the 'Community Dental Hygienic Field Practice' course was appropriate for the class.

• Journal of Digital Convergence
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• v.16 no.12
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• pp.407-415
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• 2018

The purpose of this study is to investigate the effect of SNS addiction tendency and social support on cyber violence among college students. Data collection was conducted through a structured questionnaire for 330 college students and analyzed through SPSS 18.0 program. As a result of the analysis, SNS addiction tendency was low as $1.81{\pm}0.55$, social support was $4.00{\pm}0.78$ and cyber violence was $1.38{\pm}0.59$. There was a significant positive correlation between SNS addiction tendency and SNS posting frequency, and there was a significant negative correlation between social support and grade. Cyber violence increased as the tendency of SNS addiction increased, as social support decreased, and cyber violence decreased in the second and third graders compared to the first grade. For this purpose, it is necessary to strengthen cyber education and group counseling program suitable for college students and it will be necessary to make effort to raise self - control.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.9
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• pp.459-464
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• 2019

This study examined the relationship between resilience, emotional work, and attitudes toward caregivers caring for the elderly. Data collection was conducted from November 01, 2018 to December 31, 2018. The collected data were analyzed using the SPSS Win 21.0 program. The attitudes toward caring for geriatric subjects were $3.56{\pm}.90points$ out of 5, $3.23{\pm}.74points$ out of 5 for emotional work, and $3.94{\pm}.40points$ out of 5 for resilience. The attitudes toward caring for geriatric patients were related to resilience (r= .294, p<.001). Resilience (${\beta}=.360$, p= .002) and work type (${\beta}=-.282$, p= .001) had a significant effect on the attitudes toward caring for the elderly (F=7.5355, p<.001). The explanatory power of these variables was 15.6%. The results of this study suggest that interventions may be necessary to improve the attitudes of the caregiver toward caring for the elderly.

• Food Science of Animal Resources
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• v.39 no.4
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• pp.677-685
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• 2019

Five Leuconostoc strains (CM17, CM19, PM30, PM32, and PM36) previously isolated from Indian meat showed promising antimicrobial activity against food pathogens in screening assay. This study evaluates the efficacy of these isolates against Escherichia coli Microbial Type Culture Collection and Gene Bank (MTCC) 443 and Listeria monocytogenes (MTCC 657) in spinach leaves. Challenge studies were conducted by inoculating E. coli and L. monocytogenes at 6 to 7 $Log_{10}CFU/g$ of the leaves respectively and treating them with cell free supernatant (CFS) of 48 h cultures of the isolates. The samples were stored at $4^{\circ}C$ and analyzed over a period of 5 d. The study was conducted in triplicates and statistical analysis was carried out using one-way Anova. The counts of the pathogens did not increase over the 5 d period in the control samples, without any treatment. Whereas in the case of CFS treatments, significant reduction (p<0.05) was observed in both E. coli and L. monocytogenes from 1 to 5 d with all the 5 strains as compared to the control. The counts of Listeria dropped by 0.5 to 1 log by 5 d, with PM 36 showing the highest reduction (1 log). In the case of E. coli, 1.1 to 1.5 log reduction was observed by 5 d, with again PM 36 showing the highest reduction (1.5). The overall results indicate that the isolates (specifically PM36) not only showed efficacy in in vitro studies but are also proved to be effective in food matrix making them potential clean label antimicrobial alternatives for food application.