• Journal of Welding and Joining
• /
• v.29 no.5
• /
• pp.99-105
• /
• 2011

In this study, effect of Si content on nugget diameter in electric resistance spot welded dual-phase(DP) steel was investigated. The cold rolled DP steels with different Si content (0.5, 1.0, 1.5, 2.0 wt.%) were used and thickness of those sheet was 1.2mm. With increasing Si content, nugget diameter was increased at the same welding current. This is attributed to increase of heat input result from high resistivity. Also, nugget diameter was increased with an increase in Si content for the same heat input. For this reason, the melting point of DP steel is lowered with an increase in the Si content. And solid DP steel can easily be transformed to a liquid phase because the low melting point. Finally, a prediction formula for the nugget diameter(N.D.) could be obtained in terms of heat input(Q) and melting point(M.P) as follows: N.D.(mm) = 0.11Q(J) - 0.0031 M.P.($^{\circ}C$) + 0.32.

• Women's Health Nursing
• /
• v.25 no.2
• /
• pp.182-193
• /
• 2019

Purpose: The purpose of the study was to identify effects of anxiety, social support, and Taegyo practice toward maternal-fetal attachment in pregnant women having an abortion. Method: Participants included 99 pregnant women having an abortion, who participated in this study. Collected data were analyzed using descriptive statistics, t-test, ANOVA, Pearson's correlation, and multiple regression with the SPSS WIN 23.0 program. Results: Maternal-fetal attachment was significantly negatively correlated with anxiety, and significantly positively correlated with social support and Taegyo practice. Spousal support and Taegyo practice, explained 43.8% of participants' maternal-fetal attachment. Conclusion: Results indicate that less anxiety and more social support, and Taegyo practice in pregnant women having an abortion, were associated with stronger maternal-fetal attachment. To strengthen the maternal-fetal attachment of pregnant women having an abortion experience, it would be necessary to develop and implement the Taegyo program, focusing on practicing Taegyo-related encouragement. Additionally, it is recommended that nursing intervention is provided, to encourage families to participate in the Taegyo practice together throughout the gestational period, and to maintain a positive relationship among partners.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.4
• /
• pp.2179-2188
• /
• 2014

During pregnancy, the woman experiences physical and psycho-social changes. Such changes and other factors may become stress for the pregnant woman, making it difficult to maintain healthy and happy pregnant period. In this study, we identify factors for the stress, marital intimacy, family support, and fatigue, in order to provide the foundation for developing intervention programs and improve the quality of nursing. The subjects of there search were 185 pregnant women. Stress had a negative correlation with marital intimacy and family support, and positive correlation with fatigue. Family support, fatigue, adjustment to change due to pregnant, and breastfeeding experience were the influencing factors on the stress of pregnant women. A stress management program for pregnant women needs to be designed to help them with their physical and psychological adjustments. The program will be more effective when accompanied by the family support.

• Laser Solutions
• /
• v.7 no.2
• /
• pp.19-26
• /
• 2004

The effect of shield gas on the weldability, mechanical properties and formability of CO2 laser weld joint in 600MPa grade high strength steel was investigated. Bead on plate welds were made under various welding speed and shield gas. Tensile test was carried out under the load of perpendicular and parallel direction to the weld line, Formability of the joint was evaluated by Erichsen test. As the welding speed increases, the porosity fraction decreases. The porosity fraction in the joint used Ar-$50\%He$ mixed gas as a shield gas was lower than that of the joint used Ar gas. Hardness at the weld metal of full penetrated joint was nearly equal to that of water quenched raw metal. In a tensile test under a perpendicular load to the weld axis, strength and elongation of joint produced by optimum condition were nearly equal to those of base metal. However, the strength of joint in a tensile test under a parallel load to weld axis was higher than that of raw metal, but the elongation of joint was lower than that of raw metal. Elongation and formability were further increased by the method of using Ar+He mixed gas as a shield gas as compared with Ar gas. Formabilities of joints were recorded ranging from $58\%\;to\;70\%$ of that of base metal with different shield gases.

• The Journal of the Korea Contents Association
• /
• v.18 no.2
• /
• pp.378-387
• /
• 2018

With the advent of the fourth industrial revolution in recent years, the field of health care services is getting attention again. Accordingly, personalized medical systems through smart products are emerging in various forms. With the use of wearable tech and sensor system, health management and monitoring can be done anytime, anywhere without help of others. However, healthcare services for pregnant women are very scarce. Due to the low fertility rate the number of obstetrics and gynecology is decreasing and as a result, environment surrounding the uncomfortable pregnant women is getting worse. Pregnant women are unable to take a comfortable sleeping posture due to pregnancy. Various environmental factors such as noise, temperature and humidity decrease the quality of sleeping of pregnant women and hinder happy preaching. The purpose of this study is to develop a UI design that can manage sleeping by providing good sleeping posture information and improved sleeping environment for the health of pregnant women. We expect to apply the sensor technology of the 4th industrial age to maximize the sleep quality and quality of life of expectant mothers.

• Korean Journal of Child Studies
• /
• v.3
• /
• pp.49-62
• /
• 1982

This is a study to analyze rural area women's perception and practice of prenatal care, which is the fundamental of the education of children. Further, it was aimed to provide basic data for ideal childbirth, upbringing and household management process. For that object, questionnaires were distributed to women living in Yongdong region to judge the level of general understanding on prenatal care. Research was done from three different aspects; dietary life, emotion control and health management. Percentages were drawn out to see the general tendency. The following results were discovered from data analysis: 1. Most subjects of the survey knew well about prenatal care. They had acquired that knowledge from their parents. Most thought that prenatal care is necessary. They answered that they think prenatal care has more or less effect on the fetus. The first dime they thought about prenatal care was after they found that they were pregnant. 2. The subjects knew well about dietary needs for pregnant women carried out much of what they knew. Intake of sufficiently nutritious food is somewhat difficult, but foods that are regarded as bad were avoided thoroughly. It appears that most women have much concern about what they eat during pregnancy. 3. Most of the subjects understood that the emotional stability is necessary but it wasn't put into practice so well as in dietary life. Especially, attitudes connected with emotional development like, "Look or hear only what is good (for the fetus)" were practised little. Efforts for self-restraint as "Not to hate or pick out others' defects or talk bad about others" were appeared to be great, and it is practised well, too. 4. The subjects were well-informed on health area, but practised little. Behaviors for health improvement as to "Lead a regular daily life for health" or "Not to take a long trop" were practised very faithfully. The results of the survey showed that passive attitudes related to tabooed food, self-abstinence and cautions for bodily safety were prevalent; more positive and progressive disposition missing. That is, full perception and active practices for caloric intake, emotional improvement and physical strength development are needed.

• Journal of Family Resource Management and Policy Review
• /
• v.10 no.1
• /
• pp.17-32
• /
• 2006

This essay has attempted to document the actual behavior patterns and the social networks related to the child delivery in the pre-industrial Korean society. We interviewed 30 women who had given birth to their first child during the 1930s and the 1940s in order to accumulate data related to son-prayer rites, prenatal care and food avoidance, sacred-string culture, and other incantation rituals. The characteristics of the social relationships with the person who had assisted the delivery and the recovery were also analyzed in terms of kinship networks. The results are as follows. First, there was a big gap between knowledge and the actual practices in birth rituals and customs. We assume that this is due to the adverse social-economic conditions at that time which may have restricted the actual performances of these customs. Second, there were almost no differences of the performance of these' birth customs between the urban areas and the rural areas. Third, the people who assisted the delivery were women who were mostly from the husband's family. Help from the wife's family were quite exceptional. Finally, it has been found out that only about half of the women who were interviewed performed the well-known custom of three-week after-birth confinement.

• Laser Solutions
• /
• v.10 no.3
• /
• pp.25-32
• /
• 2007

The effect of welding speed on the weldability, microstructures, hardness, tensile property of Nd:YAG laser welding joint in 600MPa grade precipitation hardening high strength steel was investigated. A shielding gas was not used, and bead-on-plate welding was performed using various welding speeds at a power of 3.5kW. Porosity in the joints occurred at 1.8m/min, but were not observed over the welding speed of 2.1m/min. However, spatter occurred over the welding speed of 6.6m/min. The hardness was the highest at heat affected zone(HAZ) near fusion zone(FZ), and was decreased on approaching to the base metal. The maximum hardness increased with increasing welding speed. The microstructure of FZ was composed of coarse grain boundary ferrite and bainite(upper) but the HAZ near the FZ contained bainite(Lower) and fine ferrite at a low welding speed. With increasing welding speed, ferrite at the FZ and the HAZ became finely and upper binite changed to lower bainite. In a perpendicular tensile test to the weld line, all specimens were fractured at the base metal, and the tensile strength and the yield strength of joints was equal to those of raw material. Elongation was found to be lower than that of the raw material.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.52 no.3
• /
• pp.289-295
• /
• 2007

This study was conducted to investigate the potential of polyphenols and polyphenol oxidase activity on the induction of rusty symptom development in ginseng root. When rusty inducing bacteria were inoculated on fresh ginseng root, the hue value of the inoculated root increased from 101.2 (white yellow) at 1 day after innoculation to 60.9 (brownish red) at 30 days after innoculation. Lysobacter gummosus, Pseudomonas veronii and Agrobacterium tumefaciens enhanced the accumulation of total phenolics. Along with the increase of total phenolics, total activity of polyphenol oxidase concomitantly increased but the specific activity of the enzyme was not.

• The Journal of Korean Obstetrics and Gynecology
• /
• v.15 no.4
• /
• pp.149-162
• /
• 2002

The fetus is greatly influenced by mother's health condition and her environment. So in our traditional society, the prenatal care is regarded as important for generations to birth of sound baby in mind and boy. Purpose : We aimed to reserch what kind of mother's conditions can be more influential to infant allergic disease among traditional prenatal care. Method : We investigated 91 patients who answered by a questionnaire at Dept. of Pediatrics, Oriental Hospital of Dae-jeon University. We divided patients into two groups, A(normal group;43) and B(allergic disease group;48) and analyzed those. Results : The pregnant women in the group B, generally have worse health conditions and are under the stress mentally and cannot get enough nutrition because of morning sickness and digestive trouble, but take more pungent and powdered food than the group A. Specially, the result is significant in anger and worry among other mental stresses and in digestive trouble and threatened abortion among other health conditions(according to order: p<0.001, p<0.05, p<0.01, p<0.001). We can see that pregnant woman's peaceful mentality and enough nutrition intake are most important to birth of sound baby in mind and also we can see that pregnant woman's regimen has influence on not only infant disease but also character and the infant allergic diseases are related to inheritable factor.