• Transactions of the Korean hydrogen and new energy society
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• v.25 no.5
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• pp.525-532
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• 2014

The sensing of a stack coolant deficiency is very important in that cooling performance of a fuel cell, overheating prevention of a stack or coolant heater. This paper explains the performance comparison between the coolant contact/noncontact level sensors and coolant deficiency sensing logic using the pressure sensor in a stagnant or circulating flow. Throughout the comparison, the pressure sensor is more suitable than the other sensors in terms of the precision, fast response, sensing frequency. After the experiment, the pressure sensor is equipped to an FCEV(Fuel Cell Electric Vehicle) to verify sensing definitely. There was no miss-sensing using pressure sensor while FCEV runs in the conditions of the paved road and cross country road.

• Korean Journal of Child Studies
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• v.29 no.6
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• pp.225-243
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• 2008

본 연구는 아동의 학습 과제 수행 이후에 보이는 부모와 아동의 정서적 반응이 문화에 따라 어떠한 차이를 나타내는지 알아보기 위해 한국계 이민자 가정과 백인가정을 대상으로 실시하였다. 미국 서북부 시애틀 지역의 8에서 9세 사이의 자녀를 둔 31 한국계 가정과 31백인 가정이 연구에 참여하였다. 연구를 위해 각 가정을 방문하였고 각 가정의 부모와 아동의 정서 반응을 비디오로 촬영하여 비교 분석하였다. 컴퓨터를 이용한 초 단위 행동 분석 결과 아동이 과제에 실패했을 때 한국계 어머니들과 아동들의 긴장과 불안 행동이 미국 백인 어머니들과 아동들보다 더 많이 나타났다. 아동의 과제 실패시, 어머니들의 부정적인 정서표현도 한국계 이민자 가정에서 더 많이 표출되었다. 아동들이 과제에 성공했을 때는 미국 백인 어머니들과 아동들이 좀 더 긍정적인 정서 반응을 많이 하였고 특히 백인 어머니들이 적극적 칭찬 등의 긍정적인 피드백을 주었다. 흥미 있게 아동들의 과제 성공 후에도 한국계 이민자 가정의 어머니들이 부정적인 정서 표출이 더 많았다. 자녀의 성에 따른 상호작용의 차이를 알아본 결과, 한국계 이민자 가정에서는 성차가 나타나지 않았고 미국 백인 가정의 부모들이 남자아이들에게 더 긍정적인 정서 표현을 보였다.

• Women's Health Nursing
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• v.18 no.1
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• pp.28-37
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• 2012

Purpose: The purpose of this study was to address the difference menopausal symptoms according to sasang constitution and menopausal status among perimenopausal women. Methods: Data for this cross-sectional study was collected by administering questionnaires that elicited general information. The menopause rating scale (MRS) and Questionnaire for the Sasang Constitution Classification II (QSCC II) was given to 284 perimenopausal women who met the eligibility criteria and agreed to participate in the study. Results: The study subjects were composed of 27.5% so-yangin, 24.6% so-eumin, 18.7% tae-eumin, and 29.6% undefined category. The total MRS and all subscales were significantly higher for postmenopausal women in comparison to premenopausal women. Especially, so-eumin and tae-eumin displayed significantly higher scores in urogenital symptoms. The MRS score in postmenopausal women who belonged to the group of tae-eumin and so-eumin was significantly higher than those for premenopausal women. However, so-yangin displayed higher scores in psychological and urogenital symptoms than tae-eumin for premenopausal women. So-eumin presented significantly higher scores in urogenital symptoms in comparison to the undefined category for postmenopausal women. Conclusion: These findings suggest that sasang constitution could be an important factor in understanding the woman's menopausal symptoms and identify the best treatment.

• Korean Journal of Health Education and Promotion
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• v.24 no.4
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• pp.87-98
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• 2007

Background: Health promotion services should be provided based on clients' health promotion needs. To provide health promotion services for elementary students in Korea, health promotion needs by geographical regions should be analyzed. Purpose: To analyze elementary students' health behaviors by regions. Method: Elementary students of 4018 from large cities, 1636 from medium sized cities, 328 from rural areas were included. Data collection was done using items from National Health and Nutrition Survey and was collected by mail from schools. For data analysis, Chi-square test and multiple logistic regression were utilized. Result: From comparison of health behaviors, there were no significant differences between large cities and medium sized cities. However, there were significant differences between urban students and rural students in terms of fast food intake, breakfast, soft drink intake, sleeping hours, tooth brush, and obesity. Conclusion: Health promotion services, especially correcting unhealthy eating behaviors for rural elementary students should be focused.

• Clinical and Experimental Pediatrics
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• v.61 no.4
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• pp.129-131
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• 2018

Purpose: The association between hypercalciuria and febrile convulsion is controversial. The present study aimed to investigate the statistical association between hypercalciuria and childhood febrile convulsions. Methods: Overall, 160 children aged 6 months to 5 years, including 80 children with febrile convulsion and 80 febrile children without convulsion (comparison group), were recruited. All laboratory tests, including 24-hour urine calcium, were undertaken in an academic clinical laboratory. Results: Forty-five children of the febrile convulsion group (60%) and 30 of the comparison group (40%) had hypercalciuria. There was a significant difference between the 2 groups (P=0.02). Conclusion: Our results indicated that there is a statistical association between convulsion and hypercalciuria in children. Since we found this association with a cross-sectional assessment, further studies, especially prospective and controlled designs, are needed.

• Journal of Korean Medical classics
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• v.31 no.1
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• pp.157-174
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• 2018

Objectives : The objective of this research is to look deeper into the thoughts of Sajudang in her book on fetal education, Taegyoshin-gi(TGSG), published in the early 19th century Joseon, which focused on her understanding of human development and bodily relationship the mother has with her child with comparison to Korean Medical texts. Methods : The characteristics of TGSG were laid out with comparison to previous texts on fetal education of both China and Korea. After this, they were closely cross-examined with Korean Medical thoughts on human creation, mother-child relationship, and mind-body relationship. Results : Sajudang's thoughts on fetal education as written in TGSG, show a deep understanding of human development and the father and mother's roles in it, expanding the responsibility of fetal education from just the mother to both father and mother. There is also awareness of the importance of the Heart that is at the center of the fetal education process, and of the mother-child relationship through blood. Conclusions : Fetal education as discussed in TGSG expands from previous discourses on the topic, distinguishing itself with thorough understanding of how fetal education works, when it begins, and what the roles of the parents and the community are. This attributes to Sajudang's knowledge that came from both books and her actual experiences.

• Steel and Composite Structures
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• v.5 no.4
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• pp.325-340
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• 2005

This paper presents a thorough investigation into the structural performance of cold-formed steel column bases using double lipped C sections with bolted moment connections. A total of four column base tests with different connection configurations were carried out, and it was found that section failure under combined bending and shear was always critical. Moreover, the proposed column bases were demonstrated to be structurally efficient attaining moment resistances close to those of the connected sections. In order to examine the structural behaviour of the column base connections, a finite element model was established using shell and spring elements to model the sections and the bolted fastenings respectively. Both material and geometrical non-linearities were incorporated, and comparison between the test and the numerical results was presented in details. The design rules originally developed for bolted moment connections between lapped Z sections were adopted and re-formulated for the design of column base connections after careful calibration against the test data. Comparison on co-existing moments and shear forces at the critical cross-sections of the column bases was fully presented. It was shown that the proposed design and analysis method was structurally adequate to predict the failure loads under combined bending and shear for column bases with similar connection configurations.

• Steel and Composite Structures
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• v.5 no.4
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• pp.289-304
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• 2005

This paper presents a thorough investigation into the structural performance of cold-formed steel column bases using double lipped C sections with bolted moment connections. A total of four column base tests with different connection configurations were carried out, and it was found that section failure under combined bending and shear was always critical. Moreover, the proposed column bases were demonstrated to be structurally efficient attaining moment resistances close to those of the connected sections. In order to examine the structural behaviour of the column base connections, a finite element model was established using shell and spring elements to model the sections and the bolted fastenings respectively. Both material and geometrical non-linearities were incorporated, and comparison between the test and the numerical results was presented in details. The design rules originally developed for bolted moment connections between lapped Z sections were adopted and re-formulated for the design of column base connections after careful calibration against the test data. Comparison on co-existing moments and shear forces at the critical cross-sections of the column bases was fully presented. It was shown that the proposed design and analysis method was structurally adequate to predict the failure loads under combined bending and shear for column bases with similar connection configurations.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.4 no.2 s.7
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• pp.73-79
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• 2005

Various CMOS quadrature-voltage-controlled oscillators(QVCOS) are designed and fabricated for the comparison of the phase noise characteristic. The first one is that the QVCO is composed of two Colpitts oscillators cross-coupled with PMOS coupling transistors. The second and third ones are the conventional LC VCO and the balanced Colpitts VCO followed by the frequency-divide-by-two, respectively. The simulation result demonstrate that Colpitts schemes show better phase noise performance by 6 dB than that of a conventional stheme in which LC VCO is followed by the frequency-divide-by-two.

• Journal of the Korean Operations Research and Management Science Society
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• v.33 no.4
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• pp.101-118
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• 2008

This study compares supply chain integration practices of high performing manufacturing plants in Korea and those in the U.S., Japan, and six European countries. Data were drawn from the High Performance Manufacturing(HPM) Round 3, a joint data-collection effort on manufacturing and supply chain management. Specifically, in the automotive, electronics, and machinery industries, we selected twenty Korean plants with high performance reputation and chose the same number of non-Korean plants(HPM top 20), based upon their competitive manufacturing capability index and customer satisfaction index. The Korean plants do not significantly differ from HPM top 20 plants in that internal value creation activities are coordinated and integrated at the corporate level and between plants. The Korean plants, however, demonstrated more integration with suppliers than with customers, and only the two of them were classified as 'outward facing', which pursues greater integration with both customers and suppliers. Unbalanced and lower integration with customers of the Korean plants was attributed to the lower than expected manufacturing capability and customer satisfaction. Implications for supply chain professionals were discussed.