• Geophysics and Geophysical Exploration
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• v.5 no.4
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• pp.257-261
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• 2002

We have carried out integrated research including field survey and numerical modeling to appraise the applicability of SP method to the leakage problems of irrigation facilities. The leakage pattern of the dike studied here can be classified into the three categories: leakage through the abutment, leakage by piping through dike, and leakage due to the composite effects of landslide and distortion of the dike structure. for the numerical modeling to interpret quantitatively SP survey results acquired at dike, we have modified the computer code proposed by Sill (1983) to apply to the leakage problems. The numerical studies match the characteristic patterns of SP anomalies according to the leakage types and appear to be very useful to interpret the leakage zone and path. The SP monitoring results were also well coincided with tidal variations observed at every embankment so we found the SP method is quite effective not only to detect the leakage zone but also to determine the leakage trend. The numerical modeling results also reproduced the SP anomalies due to seawater leakage in the embankment.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.15 no.4
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• pp.301-307
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• 2002

Direct bonded SOI wafer pairs with $Si ll SiO_2/Si_3N_4 ll Si$ the heterogeneous insulating layers of SiO$_2$-Si$_3$N$_4$are able to apply to the micropumps and MEMS applications. Direct bonding should be executed at low temperature to avoid the warpage of the wafer pairs and inter-diffusion of materials at the interface. 10 cm diameter 2000 ${\AA}-SiO_2/Si(100}$ and 560 $\AA$- ${\AA}-Si_3N_4/Si(100}$ wafers were prepared, and wet cleaned to activate the surface as hydrophilic and hydrophobic states, respectively. Cleaned wafers were pre- mated with facing the mirror planes by a specially designed aligner in class-100 clean room immediately. We employed a heat treatment equipment so called fast linear annealing(FLA) with a halogen lamp to enhance the bonding of pre mated wafers We kept the scan velocity of 0.08 mm/sec, which implied bonding process time of 125 sec/wafer pairs, by varying the heat input at the range of 320~550 W. We measured the bonding area by using the infrared camera and the bonding strength by the razor blade clack opening method, respective1y. It was confirmed that the bonding area was between 80% and to 95% as FLA heat input increased. The bonding strength became the equal of $1000^{\circ}C$ heat treated $Si ll SiO_2/Si_3N_4 ll Si$ pair by an electric furnace. Bonding strength increased to 2500 mJ/$\textrm{m}^2$as heat input increased, which is identical value of annealing at $1000^{\circ}C$-2 hr with an electric furnace. Our results implies that we obtained the enough bonding strength using the FLA, in less process time of 125 seconds and at lowed annealing temperature of $400^{\circ}C$, comparing with the conventional electric furnace annealing.

• Geophysics and Geophysical Exploration
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• v.27 no.1
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• pp.23-36
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• 2024

In this study, we analyze the structure of the Korea-Japan Joint Development Zone (JDZ) using gravity, magnetic, and seismic data. Gravity and magnetic data analysis confirmed that the Jeju Basin exhibits low anomalies compared to adjacent areas. We applied the total gradient to the Bouguer anomaly to identify basin boundaries, and computed the analytic signal from the total magnetic anomaly data to enhance the edges of the magnetic anomalies. The Taiwan-Sinzi Belt, exhibits high magnetic anomalies and crosses the center of the JDZ in the northeast-southwest direction; we presume that intrusive rocks are sporadic in the JDZ. The 3D inversion results of the gravity and magnetic data show a strong correlation between magnetic susceptibility and density (i.e. a low-density zone in the Jeju Basin and the Ho Basin, and a high magnetic susceptibility distribution in the Taiwan-Sinzi Belt). Comparison of the density and seismic profiles of the Jeju Basin shows that high densities are associated with sill, horst, and basement highs, whereas low densities are associated with basement low and grabens. These results suggest that interpretations based on seismic, gravity and magnetic data can effectively reveal the subsurface structure of the JDZ.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.28-34
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• 2011

The carbody underframe of TTX vehicle should be modified a lot for the installation of new devices such as an active suspension system between the bogie and the carbody of TTX vehicle, because the carbody underframe is one body structure consisting of a center sill welded with a carbody bolster. Modification operation of the carbody takes a lot of time and cost, because the huge sized carbody structure should be moved to a machining apparatus and machined to guarantee the manufacture accuracy of new device installation brackets. For this reason, modification operation improvement is needed to install new devices more efficiently between the bogie and the carbody. This paper introduce the development of 'bogie/carbody interface bolster' that not only supports the carbody weight but also enables new devices to be installed more efficiently between the bogie and the carbody. This development has advantage to reduce working time and cost to install new devices such as an active suspension system between the bogie and the carbody by minimizing the modification of the carbody of TTX vehicle.

• The Journal of Korean Academic Society of Nursing Education
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• v.19 no.1
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• pp.60-68
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• 2013

Purpose: This research was conducted to compare the effect of a wellness program on knowledge of obesity and weight loss in women schizophrenia inpatients. Methods: A nonequivalent control group pretest-posttest design was used for this study. A total of 44 patients with schizophrenia were randomly divided into an experimental group (22) and a control group (22) in a 12-week multimodal weight control program. For 6 weeks, the experimental group received approximately an hour of teaching on obesity interventions and for another 6 weeks one hour of teaching on exercise and weight control interventions while the control group received the usual care. The outcome variables were measured before and after the program. Data was analyzed with the ${\chi}^2$-test and t-test using PASW Statistics 18. Results: For those who completed the weight control program, there was a mean weight loss of 1.37kg by the end of the intervention. The experimental group showed significant improvement in knowledge of obesity and weight loss. Conclusion: The wellness program was effective in reducing the weight of women schizophrenia patients as well as being effective in increasing knowledge of obesity. Therefore, nurses must consistently educate women schizophrenia inpatients about health care and knowledge of obesity.

• The Korean Journal of Rehabilitation Nursing
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• v.18 no.1
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• pp.46-56
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• 2015

Purpose: The purpose of this study was to identify health status and the use of complementary and alternative therapies in the community dwelling pre-elderly and elderly. Methods: A total of 193 subjects participated in this study. They were recruited from one senior welfare center, four senior citizen centers and subjects' home in two cities. Data were collected with self-reported questionnaires to measure health status and the use of complementary and alternative therapies. Data were analyzed by t-test, ANOVA using SPSS/WIN 22.0. Results: Health status in this subjects was different depending on their age, sex, education, religion, type of family, and average monthly living expenses. Most used items as complementary and alternative medicine are diet therapy, herbal medicine such as health supplement food therapy, vitamin therapy, and Korean folk remedies. There were statistically significant differences in using complementary and alternative therapies according to one's current health status (F=7.09, p<.001), comparing health status to peers (F=3.67, p=.013), and chronic disease having more than three months (t=-2.50, p=.013). Conclusion: This study suggest that individualized health care should be continued for the pre-elderly and elderly. Moreover, we need to prepare long term care plans such as educations for applying complementary and alternative therapies.

• Journal of muscle and joint health
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• v.20 no.2
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• pp.102-111
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• 2013

Purpose: This study was conducted to examine the effects of a fall prevention education on the fall-related knowledge, prevention activity of the elderly hospitalized in internal medicine department. Methods: A nonequivalent control group pretest-posttest design was used for this study. A total of 44 patients of the elderly hospitalized in internal medicine department were randomly divided into the experimental group (n=22) and the control group (n=22). The experimental group received about an half hour, fall prevention education at the admission day, 3days and 5days after admission, while the control group received the usual care. The outcome variables were measured before and after fall prevention education. Data were analyzed with $x^2$-test and t-test by using SPSS 12. Results: The experimental group showed significant improvement in fall-related knowledge and prevention activity. Conclusion: The fall prevention education was effective in increasing fall-related knowledge and prevention activity of the elderly hospitalized in internal medicine department. For reducing fall events, it is important to educate the elderly hospitalized about fall-related knowledge and prevention activity related to fall.

• The Journal of Korean Academic Society of Nursing Education
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• v.20 no.2
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• pp.332-340
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• 2014

Purpose: This study was done to identify the relations on self-esteem, empathy and interpersonal relationship to reinforce competence in communication skills of nursing students. Method: Participants consisted of 84 entire 1st year students of a nursing college. Variables included self-esteem, empathy, interpersonal relationship and demographic variables. Data was analyzed by frequencies, ANOVA and Pearson's correlation. Results: Satisfaction in nursing science of the subjects was 97.5% above average, Self understanding of the subjects was 93% above average. There were significant difference in self-esteem, empathy and interpersonal relationship among satisfaction in nursing science and self understanding of the subjects. Self-esteem positively correlated to empathy, empathy positively correlated to interpersonal relationship and interpersonal relationship positively correlated to self-esteem. Conclusion: In order to improve core competence in effective communication skills of nursing students, it is important to actively intervene for improving self-esteem and empathy and interpersonal relationship. Therefore, when organizing a communication subject of a nursing college, it is crucial to develop a program that leads to higher learning satisfaction of nursing study by improving self-esteem and empathy and interpersonal relationship skills.

• The Korean Journal of Health Service Management
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• v.11 no.2
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• pp.117-127
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• 2017

Objectives : This study aimed to identify factors of adolescents' cell-phone dependency using Agnew's General Strain Theory (GST) and the perspective of adolescents' micro-systems. A second aim was to verify the moderating effect of self-esteem. Methods : In total, 2,046 students who participated in a study on KCTPS mid. 1 panel 3 Wave by the National Youth Policy Institute were examined in this research. Data were analyzed through descriptive statistics, factor analysis, reliability tests, and hierarchical linear regression using SPSS Ver. 22.0. Results : The strain factors had a positive effect on adolescents' depression, and depression had a positive effect on cell-phone dependency. In addition, self-esteem had a negative moderating effect between depression and cell-phone dependency. Conclusions : Factors of cell-phone dependency were identified. The findings of the study indicate that an intervention is required to lower strain and depression and to enhance self-esteem among adolescents.

• The Korean Journal of Health Service Management
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• v.11 no.2
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• pp.17-27
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• 2017

Objectives : The rapidly changing consumer-centric and customer-oriented nature of the medical environment results in significant cognitive load. We aimed to clarify the situation of emotional labor and job stress among hospital employees and seek policies and hospital management for employees' emotions. Methods : The study was conducted through a questionnaire about emotional labor and job stress among 554 individuals working in Seoul, in 9 national, public, and private hospitals. Results : The results of the emotional labor and job stress questionnaire showed statistically significant differences in surface behavior and job stress; both had higher values in employees from the private hospitals than employees from public hospitals. Conclusions : This study found that the stress of emotional labor is a serious problem in government medical institutions. In addition, these institutions need to provide internal customer satisfaction through the hospital ombudsman and harmonize work and healing programs by including plans for improvement.