• Tunnel and Underground Space
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• v.17 no.5
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• pp.350-359
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• 2007

Most large cut slopes of open pit mines, roadways, and railways are steeply inclined and composed with rocks that do not contain soils. However, these rock slopes suffer both weathering and fragmentation. In the case of steep slopes, falling rock and collapse of a slope may often occur due to surface erosion. Cast-in place concrete and rubble work are the most widely used earth structure-based pressure supports that act as restraints against the collapse of the rock slope. In order to overcome the shortcomings of conventional retaining walls, a segmental grid retaining wall is being used with connects precasted segments to construct the wall. In this study, laboratory model test was conducted to estimate deformation behavior of segmental grid retaining wall with configuration of rear strecher, height and inclination of the wall. In order to examine the behavior characteristics of a segmental grid retaining wall, this research analyzes the aspects of spacial displacement through relative displacement according to change in the inclination of the wall. Also, the walls behavior according to the formation and status of the rear stretcher which serves the role of transferring the load from the header and the stretcher which make up the wall, the displacement of backfill materials in the wall, and the location of the maximum load were surveyed and the characteristics of displacement in the segmental grid retaining wall were observed. The test results of the segmental grid retaining wall showed that there was a sudden increase in failure load according to the decrease in the wall's height and the size of the in was greatly decreased. Furthermore, it revealed that with identical inclination and height, the structure of the rear stitcher did not greatly affect the starting point or size of maximum horizontal displacement, but rather had a stronger effect on the inclination of the wall.

• Journal of the Korean Society for Nondestructive Testing
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• v.30 no.5
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• pp.471-478
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• 2010

Thin films play an important role in many technological applications including microelectronic devices, magnetic storage media, MEMS and surface coatings. It is well known that a thin film's material properties can be very different from the corresponding bulk properties and thus there has been a strong need for the development of a reliable test method to measure the mechanical properties of a thin film. We have developed an alternative and convenient test method to overcome the limitations of previous membrane deflection experiment and uniaxial tensile test by adopting a white light interferometer having sub-nanometer out-of-plane displacement resolution. The freestanding aluminium specimens are tested to verity the effectiveness of the test method developed and get the tensile properties. The specimens are 0.5 rum wide, $1{\mu}m$ thick and fabricated through MEMS processes including sputtering. 1 to 5 specimens are fabricated on Si dies. The membrane deflection experiments are carried out by using a homemade tester consisted of a motor-driven loading tip, a load cell, and 6 DOF alignment stages. The test system is compact enough to set it up beneath a commercial white light interferometric microscope. The white light fringes are utilized to align a specimen with the tester. The Young's modulus and yield point stress of the aluminium film are 62 GPa and 247 MPa, respectively.

• Korean Journal of Plant Tissue Culture
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• v.28 no.3
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• pp.135-140
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• 2001

A series of studies were carried out to establish micropropagation system, using airlift bioreactors (ebb $\varepsilon$ flood type, 5 L), of Lilium oriental hybrid 'Casa Blanca'. The bulblets with swollen basal plate were formed from bulb scales, then proliferated to bulblet clusters with swollen basal plate. Finally normal bulblets were formed from the sections. Bulblet formation and proliferation with swollen basal plate were not accomplished entirely in liquid culture of 5 L airlift bioreactors, but leafy bulb scales grew vigorously. Bulblet clusters with swollen basal plate were proliferated by periodic immersion culture. Bulblet proliferation was not affected by light, but scale leaves grew under light. MS medium containing 2.0 mg/L benzyl adenine (BA) and 0.3 mg/L indole acetic acid (IAA) was favorable to the bulblet proliferation with swollen basal plate. In liquid culture of 5 L bioreactors, bulblets from bulblet sections with swollen basal plate grew vigorously on MS medium with 70 g/L sucrose. It was effective for bulblet growth to replace the new medium after 8 weeks in culture during 16 weeks of cultural period. 15 g injection of bulblet sections as a cultural material was suitable for bulblet growth in 5 L bioreactors.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.40 no.1
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• pp.78-85
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• 2004

The new biotelemetry method and system that the installation and the treatment of equipment is convenient and the instantaneously detailed position of the fish attached a pinger is able to track comparatively easily had been developed, an practicality of it were verified in the water tank and the small sea port through the tracking of fish. The biotelemetry method had been gotten the three dimensional locations of fish to the receiving transducer by combining of the super short base line (SSBL) method to detect the direction of pinger and the pinger synchronizing method to measure the range from receiving transducer to pinger. The receiving system had been designed to realize the high precision or wide detection range by application of the basic design method for receiving system of biotelemetry and the hydrophone array configuration. From tracking test of carp in the water tank, the migration course and the velocity of carp was investigated and the observed migration course was compared with measurement. The measured migration course of carp coincided with the observation in the main and the position of carp was able to track three dimensionally. The velocity of carp measured by the moving average method was 11.2cm/s. From tracking test of yellowtail in the small sea port, the migration course and the velocity of yellowtail was investigated at natural condition. The position of yellowtail was able to track three dimensionally and the velocity of it measured by moving average method was 43.9cm/s.

• Korean Journal of Social Welfare
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• v.37
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• pp.195-216
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• 1999

Adolescents whose families receive public assistance are primary interest in the article because they experience disproportionate shares of the burden of poverty and psychosocial stress and are at substantially high risk. To explain the psychosocial stresses of high-risk adolescents in poverty, this study analyzed the inter-relations and interactions of major variables: 1) stress related life condition, 2)individual & environmental resources, 3) emotional, behavioral, and academic adjustment. Data came from the survey of 351 students living in the families receiving public assistance. The major findings were as follows. High-risk adolescents in poverty suffered from chronic stresses related life conditions, including family environmental stress, financial & medical stress and stigmatic stress. As the effects of stress increased, depression/anxiety and delinquency of poor youth increased. The psychosocial adjustment of poor youth at risk was most effected by the stress resulted from family environment. Though they were suffered from stresses related poor environment, adolescents in poverty adjusted well, if they had individual and environmental resources including self-esteem democratic parenting and supportive school climate. In conclusion, this study confirmed that emotional, behavioral, and academic adjustment of adolescents in poverty was affected by various stresses from life conditions and individual and environmental resources. In order to improve adjustment of poor youth at risk, life conditions have to be improved and psychosocial resources to be increased. These findings have provided practical implications for social workers helping high-risk adolescents in poverty.

• Journal of the Korean Data and Information Science Society
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• v.24 no.3
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• pp.523-532
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• 2013

Generally, data mining is the process of analyzing big data from different perspectives and summarizing it into useful information. The most widely used data mining technique is to generate association rules, and it finds the relevance between two items in a huge database. This technique has been used to find the relationship between each set of items based on the interestingness measures such as support, confidence, lift, etc. Among many interestingness measures, confidence is the most frequently used, but it has the drawback that it can not determine the direction of the association. The attributably pure confidence and compared confidence are able to determine the direction of the association, but their ranges are not [-1, +1]. So we can not interpret the degree of association operationally by their values. This paper propose a compared and attributably pure confidence to compensate for this drawback, and then describe some properties for a proposed measure. The comparative studies with confidence, compared confidence, attributably pure confidence, and a proposed measure are shown by numerical example. The results show that the a compared and attributably pure confidence is better than any other confidences.

• Korean Journal of Health Education and Promotion
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• v.16 no.2
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• pp.67-80
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• 1999

This study was designed to provide the basic data of nursing intervention for alleviation of effective adjustment of cancer patients by identifying the correlation between the spiritual well-being and family support. The subjects for this study were 69 patients who were diagnosed as cancer and were admitted to a university hospital in Pusan. Data were collected during the period between December 1, 1998 and January 20, 1999 by interviewing with questionnaires. Family support questionnaire consisted of 11 questions answerable on a 5 point Likert scale developed by Kang Hyun Suk(1985). Spiritual well-being questionnaire consisted of 20 questions answerable on a 4 point Likert scale modified by Kang Jeong Ho(1996). The data were analyzed by in descriptive statistics, Pearson correlation coefficient, t-test and ANOVA using SPSS/WIN program. The results of this study were as follows. 1. The mean score for family support in cancer patients was 49.48, which indicated that cancer patients perceived their state of family support as high level. The mean score for spiritual well-being in cancer patients was 55.87, which indicated that cancer patients perceived their state of spiritual well-being as moderate level. Among the components of spiritual well-being, the mean score for religious well-being was 26.94 and for existential well-being 28.93. From the above, the mean score for existential well-being was higher than that of religious well-being. 2. There were statistically significant differences in family support according to the types of primary caregivers(F=3.48, p=0.008). The spouse caregiver showed the highest family support among the caregivers. There were statistically significant differences in spiritual well-being according to the job(F=2.20, p=0.046) and the level of perceived health status(F=2.71, p=0.05). There were statistically significant differences in religious well-being according to the religion(F=2.42, p=0.004) and the number of family members(F=3.38, p=0.040). And there were statistically significant differences in existential well-being according to the job(F=2.48, p=0.026) and the level of perceived health status(F=2.74, p=0.048). 3. There were positive correlation between spiritual well-being and the family support(r=0.481, p=0.000), between religious well-being and family support(r=0.336, p=0.008) and existential well-being and family support(r=0.519, p=0.000).

• Child Health Nursing Research
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• v.7 no.3
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• pp.280-297
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• 2001

The purpose of the study was to develop and test the model for the quality of life in mothers of children with nephrotic syndrome. A hypothetical model was constructed on the basis of previous studies and a review of literature. The conceptual framework was built around ten constructs. Exogenous variables included in this model were mother's health, father's health, marital intimacy, mother's attitude on children, economic state, side effect of steroid, severity of illness and social support. Endogenous variables were mother's burden and quality of life. Empirical data for testing the hypothetical model were collected by using a self-report questionnaire from 152 mothers of children with nephrotic syndrom at the outpatient clinics and in the hospital. The data was collected from May, 1999 to August, 1999.Reliability of the seven instruments was tested with Cronbach's alpha which ranged from 0.71 - 0.92.For the data analysis, SPSS 8.0 WIN program and LISREL 8.20 WIN program were used for descriptive statistics and covariance structural analysis. The results of covariance structural analysis were as follow :1. The hypothetical model showed a good fit with the empirical data. [x2 = .56, df = 3, p = .90(p>.05 ), GFI = .99, AGFI = .99, RMSR = .005.] 2. For the parsimony of model, a modified model was constructed by deleting 1 variable and excluding 2 paths according to the criteria of statistical significance and meaning.3. The modified model also showed a good fit with the data[x2 = 2.83, df = 7, p = .90( p>.05 ), GFI = 1.00, AGFI = .97, RMSR = .011].The result of the testing of the hypothesis were as follows : 1. Mother's health(γ21 = .26, t = 4.16), father's health(γ22 = .19, t = 2.92), marital intimacy(γ23 = .26, t = 4.13) and social support(γ28 = .12, t = 2.03) had a significant direct effect on the quality of life.2. Mother's burden(β21 = -.20, t = -3.10) had a significant negative direct effect on the quality of life.3. Mother's attitude on children(γ14 = -.34, t = .-4.57), mother's health(γ11 = -.22, t = -2.96) and side effect of steroid (γ16 = -.23, t = .-2.69) had a significant direct negative effect on the burden. The result of this study showed that mother's health, marital intimacy, mother's burden, father's health, and social support had a significant direct effect on the quality of life. Mother's attitude on children, mother's health, and side effect of steroid had a significant direct effect on mother's burden. These six variables, mother's health, marital intimacy, father's health, social support, mother's attitude on children and side effect of steroid were identified as relatively important variables. The results of this study suggest, it needed to determine the nursing intervention will alleviate mother's burden and promote a greater quality of life in mothers of children with nephrotic syndrom.

• Child Health Nursing Research
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• v.7 no.4
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• pp.405-420
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• 2001

The main purpose of this study was to identify the effect of phone counseling carried out to promote the role of the primiperous mothers. The data were collected from march 20 to may 30, 1998. The subjects for the study were the mothers of 60 first bon neonates admitted to and discharged from Sam-sung Medical Center's neonatal ward. Thirty subjects were assigned to the experimental group and thirty to the control group. A measure of maternal identity as well as level of self confidence in taking care of an infant after giving birth was taken. Informational supportive nursing was then provided to the mothers through phone counseling for a total of four times at 2~3 days, 7~8days, 12∼13days and 18∼1days after discharged. The level of self confidence in taking care of an infant was then remeasured. The control group was not provided with supportive nursing through phone counseling instead the level of confidence in taking care of an infant was measured at 3 weeks. Taking previous study documentary evidence into consideration the researcher developed a supportive nursing telephone counseling program that provided both informational and emotional support suitable to primiperous mothers. A semantic differential scale developed according to Osgood and translated and adapted by Koh Hyo-Jung was used as the maternal self identity measurement tool. The tool used to measure self confidence in taking care of infant was the developed by Bak Mi Suk which includes 13 items from Pharis's self confidence scale The data were analyzed using χ²-test, t-test and paired t-test. The result of the study are as follows 1. First hypothesis The level of self confidence in taking care of an infant for the group of primiparas who received phone counseling in the postpartum period would be higher than that of the primiparas who did not receive phone counselling : As the experimental group's level of self confidence in taking care infants was significantly higher than that of the control group this hypothesis is accepted 2. Second hypothesis The level of maternal identity will be higher for the group of primiparas who received phone counseling than that of primiparas who did not received phone counseling As the experimental group's level of maternal identity was significantly higher than that of the control group this hypothesis is accepted In looking at the results of the study as a whole, it can be concluded that emotional and informational nursing support provided through phone counselling is an effective strategy in promoting the role of new mothers.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.15 no.5
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• pp.1-11
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• 2020

Increasing the number of unicorn startups has recently received much attention. In this study, we attempt to investigate that startups achieving an extremely high valuation could postpone their exit to raise more investment and receive more benefits. This study tested the hypotheses using data from Crunchbase, World Bank, Global Competitiveness Report, and Global Entrepreneurship Monitor. Using 140 unicorn startups that have already exited through an initial public offering (IPO) or mergers and acquisitions (M&A), we find out that unicorn startups tend to acquire higher valuation as their investment duration increases. Furthermore, we also examined the moderating effects of governmental policy and institutional distance from foreign investors in order to consider the institutional aspects of startups. The results of the moderating variables show significant supports. We expect to provide a better understanding with respect to making an exit decision of unicorn startups. Furthermore, managers and investors need to acknowledge the institutional factors of startups when they decide to fund.