• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.07b
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• pp.1262-1265
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• 2004

송전용량 증가를 위해 개발되어 최근 본격적으로 사용되고 있는 STACIR/AW 송전선은 송전용량의 증가에 따라 그 운전환경도 변화하여 연속사용온도의 경우, 기존 ACSR 전선의 90t에 비해 높은 $210^{\circ}C$로 규정 되어 있을 만큼 고온에서 운전되고 있다. 따라서 STACIR/AW 송전선은 이도설계와 그 운용에 있어서 운전 온도 상승에 따른 각별한 주의관리가 필요하다 실제 STACIR/AW송전선은 그 설계단계에서도 이와 같은 고온운전 환경을 고려하여 고온에서도 소정강도를 유지하는 내열 Al도체와 이도제어를 위한 낮은 열팽창 특성의 INVAR합금(Fe-35Ni계 합금)을 강선으로 하는 특화된 재료로 구성되어 있다. 그러나 이와 같은 재료 설계적 보완책에도 불구하고 실제 송전선은 전선의 자중, 철탑 간에 형성된 가설장력과 같은 다양한 응력이 고온환경에서 부하되는 복합 열화 상태에 노출되어 있고, 이것은 재료학적인 관점에서 크릴 변형 발생의 가능성을 높이고 있으나 이것에 대한 연구 또는 실험결과는 크게 미미한 실정이다. 본 연구에서는 STACIR/AW $410mm^2$ 송전선과 그 구성소재를 대상으로 $200^{\circ}C$, $300^{\circ}C$에서 장시간 열화한 후, 구성소재의 탄성계수, 열팽창계수 및 STACIR/AW전선의 크림변형 거동을 조사하여 열화에 노출된 STACIR/AW 송전선의 이도변화 거동을 규명하고자 하였다.

• Journal of the Korea Convergence Society
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• v.9 no.1
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• pp.171-180
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• 2018

This study is to find the convergence effect of a spouse's support on postpartum depression and self-efficacy in primipara. The subjects were 37 primipara who gave birth to normal full term babies and their spouses. Each spouse supported their mother and baby from the period of postpartum 1st to 6th week after finishing three sessions of postpartum mother and baby care using teaching material. The data was collected in the 1st and 6th week postpartum and analyzed using SPSS 20.0. The prevalence of postpartum depression in the 1st and 6th week were 24.3% and 0% each. The spouses' support lowered mothers' postpartum depression and increased self-efficacy(p<.001). And, the factors affecting to mothers' postpartum depression were additional personnel for postpartum management, income and antepartum depression, and to their self-efficacy was hospital treatment during pregnancy(p<.05). The results could be used in developing intervention programs on lowering primiparas' postpartum depression and increasing their self-efficacy after further studies with wider range of subjects and setting control group.

• Journal of Mushroom
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• v.2 no.2
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• pp.109-113
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• 2004

Pleurotus eryngii is not edible and medicinal mushrooms indigenous to Korea. To improvement of strain suitable to the geographic setting of Korea, we are mated with 22 dikaryons and 47 monokaryons isolated from Pleurotus eryngii ASI 2547 by Di-Mon mating. 19 strains forming fruit body obtained from clamped 253 bred strains. 7 excellent strains are selected from 19 bred strains by various morphological features of fruit body. Among the selected 7 strains, H6 strain were identified into ASI 2547-like recombinant hybrids with URP uniprimer by RAPD analysis. This suggested that Di-Mon crossing is one of rapid and easy breeding method for strain improvement with molecular techniques.

• The Journal of the Korea Contents Association
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• v.12 no.12
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• pp.702-713
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• 2012

The purpose of this study was to evaluate the quality of internet information about childhood fever and fever management. A total of 48 web sites with information about childhood fever and fever management in Korea were analyzed. Each web site was evaluated in terms of degree of the latest, creator, source, disclosure, and the accuracy of information. Accuracy of information was checked by comparison with published childhood fever management guidelines and current best evidences. The quality of internet information about fever and fever management was generally poor and not consistent. Moreover, it did not reflected current scientific evidences. It is important that parents should aware of these deficiencies and internet information can not substitute for consultation with health care professionals. Moreover, there was an urgent need to improve evidence-based fever management information on the internet.

• Journal of Preventive Medicine and Public Health
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• v.29 no.2 s.53
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• pp.255-264
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• 1996

To study reliability and validity of PWI, this newly developed self-administered questionnaire which measures stress, was given to medical students. All respondent(133) were followed 4 weeks later and 92 were retested. Cronbach's $\alpha$ coefficient of data was 0.93. Test-retest reliability measured by Pearson's correlation coefficient was 0.72(P<0.01). Exploratory factor analysis(EFA) performed by principal axis factor method without iteration and by varimax rotation explored 13 principal components(eigenvalues > 1). After exploring 4 factor structure according to previous study results, factor 1 showed good agreement but other factors did not. Confirmatory factor analysis(CFA) showed poor fit of 4 factor model to data. In the further study, it may be considered to model that has unidimensional factor structure.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.12
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• pp.54-61
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• 2011

We propose a surveillance-alert system based on optimal placements of PDR(Pulsed Doppler Radar) sensors in USN. By using the detection information of moving target from PDR sensor and by considering the covered detection region and geographical property of the strategic area, three optimal placements of sensors are proposed. The proposed placement are named as the grid type, the linear type and the zigzag type. Also, the surveillance alert system based on three sensor placements are developed. The alert level of the proposed surveillance-alert system are 'Perception', 'Caution', 'Warning' and 'Danger' which are decided by the distance change between the moving targets and the command post. The performace of the developed system is verified via outdoor experiments.

• Journal of the Korea Society of Computer and Information
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• v.10 no.2 s.34
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• pp.31-38
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• 2005

The web is expected to cause the lot of its utilizing as a means of computer instructed learning and recently the applying instance on the web is more increasing in the education. From educational perspectives. the web-based instruction is much superior to any other medium in the view of interaction and greater to the amount of transmitted information. The various learning contents of WBI program can make students feel more excited and interested in learning activities. Also the creative talent and application abilities of the learner are able to be developed by mixing various sorts of multimedia materials up such as moving pictures. graphics and sounds. In this study, a WBI courseware learning program for the problem solving was designed and Proposed on the base of the theory of constructivism for the subject of social science in the 6th grade of elementary school. The experimental results showed that the learning accomplishment of an experimental class was much better than that of an existent class.

• Journal of Digital Convergence
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• v.12 no.2
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• pp.363-372
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• 2014

The purpose of this study was to explore relationship among self efficacy, major satisfaction, nursing ethics values in nursing department students so nursing students' ethical values, so that the correct opening for the establishment of training courses was to try to provide the basic data. Data were collected from 275 nursing department students and analyzed using descriptive statistics, t-test, ANOVA, Bonferroni's test and Pearson's correlation coefficients with the SPSS/WIN 18.0 program. The results of this study self-efficacy, major satisfaction was more than the middle, the subjects were taking positions of responsibility. Nursing ethics values and self-efficacy, major satisfaction and subject areas showed a very low correlation, self-efficacy and major satisfaction is a significant positive correlation. Therefore, to enhance self-efficacy and nursing students that can be sustained by developing a variety of educational programs for nursing professionals to meet and establish a firm that values nursing ethics is urgently required.

• Journal of Convergence for Information Technology
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• v.10 no.6
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• pp.193-199
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• 2020

The aim of this survey has been to investigate the effects of positive psychological capital of students from some universities in Busan and Ulsan on communication skills and interpersonal skills. As a result of the relationship with the main variables, there was a significant positive correlation between sub-factors of positive psychological capital and each ability. Hope(p<0.01) and Resiliency(p<0.05) among the effects of positive psychological capital on communication skills were statistically significant, and, in case of those on interpersonal skills, Resiliency(p<0.001), Efficacy(p<0.05), and Hope(p<0.05) were statistically significant. Therefore, it is necessary to develop and apply an intervention program that can establish the importance of positive psychological capital and strengthen positive psychological capital in order to improve students' communication and interpersonal skills.

• The Journal of the Petrological Society of Korea
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• v.2 no.2
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• pp.130-138
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• 1993

Kyeonggi Gneiss complex forming Korean Precambrian basement is mainly composed of high-grade metasedimentary rocks, which are generally difficult to determine their absolute ages. We examined the feasibility of successive absolute age determination method for the marbles from this basement. We used hydrochloric acid for the selective dissolution of carbonate minerals from the marbles. Trace element analysis shows that most of Zr and Rb are concentrated in the residues. U in the residue is more abundant than that in HC1-dissolved parts. Pb, Sr, Sm, and Nd are somewhat evenly distributed between HC1-dissolved parts and the residues. }Th shows rather complex behavior. Sr isotopic compositions of the HC1-dissolved parts reveal mixing with Sr from non-carbonate minerals having much higher $^{87}Sr/^{86}Sr$ ratios. We suggest that the most reliable method in the age determination for the marbles of this area is measuring Pb isotopic ratios of the pieces of pure marbles.