• Journal of the Korean Geotechnical Society
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• v.22 no.11
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• pp.55-64
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• 2006

It is very Important to predict the damage zone of a rock mass induced by blasting for the excavation of an underground cavity such as a tunnel, as the damage zones incur mechanical and hydraulic instability of the rock mass potentially. Complicated blasting processes that can hinder the proper characterization of the damage zone can be effectively represented by two loading mechanisms. The first mechanism is the dynamic impulsive load-generating stress waves that radiate outwards immediately after detonation. This load creates a crushed annulus along with cracks around the blasthole. The second is the gas pressure that remains for an extended time after detonation. As the gas pressure reopens some arrested cracks and extends these, it contributes to the final structure of the damage zone induced by the blasting. This paper presents a simple method to evaluate the damage zone induced by gas pressure during rock blasting. The damage zone is characterized by analyzing crack propagations from the blasthole. To do this, a model of a blasthole with a number of radial cracks that are equal in length in a homogeneous infinite elastic plane is considered. In this model, crack propagation is simulated through the use of only two conditions: a crack propagation criterion and the mass conservation of the gas. The results show that the stress intensity factor of a crack decreases as the crack propagates from the blasthole, which determines the crack length. In addition, it was found that the blasthole pressure continues to decrease during crack propagation.

• The Journal of Korean Institute of Next Generation Computing
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• v.13 no.3
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• pp.15-25
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• 2017

As the value and importance of softwares are growing up, software theft and piracy become a much larger problem. To tackle this problem, it is highly required to provide an accurate method for detecting software theft and piracy. Especially, while software theft is relatively easy in the case of Android applications (apps), screening illegal apps has not been properly performed in Android markets. In this paper, we propose a method to effectively measure the similarity between Android apps for detecting software theft at the executable file level. Our proposed method extracts method reference frequency and manifest information through static analysis of executable Android apps as the main features for similarity measurement. Each app is represented as an n-dimensional vectors with the features, and then cosine similarity is utilized as the similarity measure. We demonstrate the effectiveness of our proposed method by evaluating its accuracy in comparison with typical source code-based similarity measurement methods. As a result of the experiments for the Android apps whose source file and executable file are available side by side, we found that our similarity degree measured at the executable file level is almost equivalent to the existing well-known similarity degree measured at the source file level.

• Journal of Christian Education in Korea
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• v.72
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• pp.205-223
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• 2022

This study was conducted to explore whether problem-solving ability mediates the effect of self-directed learning ability on interest level in a distance learning environment. The subjects of this study were 64 students in the Department of Christian Education and Early Childhood Education at A University located in Gyeonggi-do. For this study, data were collected through questionnaires on interest level, self-directed learning ability, and problem-solving ability. Collected data are analyzed using SPSS Macro and bootstrapping method. As a result, self-directed learning ability for interest level has a positive effect on .651 level. The influence of self-directed learning ability in step 2, which includes problem-solving ability, which is a parameter. It was lowered to .543 level. And the effect of problem-solving ability was found to be at .360 level. As a result, it can be judged that problem-solving ability mediates the effect of self-directed learning ability on interest level. The research results suggest that the level of interest can be improved by supporting problem-solving skills in a distance learning environment.

• 한국노년학
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• v.30 no.3
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• pp.993-1003
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• 2010

his study was to investigate effects of improvement of balance abilities through 8-weeks Transcutaneous Electrical Nerve Stimulation (TENS) and balance training in the women elderly. 42 women elders who were participated in silver college. Randomized study design of two groups was used: TENS group (21 women, 84.53 years old) and balance training group(21 women, 79.93 years old). Each group had a application of TENS, balance training by a researcher three times per week for 8 weeks. Measurements of static postural sway velocity on the floor and foam, timed get up and go test (TUG), functional reach test (FRT), and lateral functional reach test (LFRT) were evaluated at initial presentation (pretest) and after completion of the each intervention program (posttest). The results showed that the TUG was significantly decreased in all groups (p<.05) and the postural sway velocity using force plate in all conditions was significantly decreased in all groups (p<.05). FRT and LFRT were significantly increased in all groups (p<.05). There were significantly differences in TUG and postural sway velocity on the eye closed condition between two groups (p<.05). In conclusion, the application of TENS to older adults whose somatosensory were deteriorated was effective for improvement balance ability.

• 한국노년학
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• v.29 no.4
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• pp.1521-1538
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• 2009

The purpose of the present study was to examine the structural causal relationships among problem drinking of elderly, depression, self-esteem and life satisfaction through structural Equation Modeling and also to investigate how these effects were influenced by the differences in the structural relationships between poor and non-poor elderly. The results showed the positive relationship between problem drinking and depression not also poor elderly group but non-poor elderlys'. According to Multi-group analysis, Latent means analysis where non-poor elderly are used as the reference group, poor elderly group showed higher latent mean values on the problemdrinking and depression, and lower latent mean values on the self-esteem and life satisfaction. Depression mediated the relationships between problem drinking of elderly and life satisfaction the only in a poor elderly group. The implications and limitations of this study were discussed, and the suggestions for further studies were recommended.

• Korean Journal of Culture and Social Issue
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• v.24 no.4
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• pp.519-539
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• 2018

This study investigates the impact of organizational socialization tactics on newcomers' organizational citizenship behaviors. We explains this relationship with the concept of perceived organizational support, which refers to the extent to which individuals perceive that the organization recognizes their contributions and takes care of their well-being. We expect that the more institutionalized the organization's socialization tactics are, the more organizational support individuals perceive, consequently increasing the performance of organizational citizenship behaviors. We performed a survey targeting 450 newcomers in domestic companies, and adopted 382 data for path analyses based on the structural equation modeling. As the result, in all the three dimensions of socialization tactics (content, context, social), the extent to which socialization tactics are institutionalized is positively related to the perception of organizational support. It also has the positive relationship with individuals' organizational citizenship behaviors, being fully mediated by the perceived organizational support. More specifically, context socialization tactics shows the highest level of impact both on the perceived organizational support and organizational citizenship behaviors, whereas social tactics has the lowest level of impact. These results imply that the range of effects the organizational socialization has on the newcomers' attitudes and behaviors should be more extended and detailed.

• Korean Journal of Culture and Social Issue
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• v.12 no.1
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• pp.1-14
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• 2006

The purpose of this study was to investigate the influences of impulsivity, family' gambling and the distance from the gambling facilities, on adolescents' gambling activity, gambling belief and gambling motivation in the future. A total of 567 high school students in Jeongseon and Taeback(the Kangwon-Land Casino area or near the Kangwon-Land Casino), in Gwhachoen City(near the Seoul Race Park), and in Whachoen(far from the gambling facilities area) were participated in this study, and completed the questionnaires for measuring adolescents' gambling activity, gambling belief and gambling motivation in the future, impulsivity and family gambling behaviors. Results showed there were positive relationships impulsivity, family' gambling, adolescents' gambling activity, gambling belief and gambling motivation in the future. There were significant relationships among dwelling areas, gambling behaviors, and beliefs. Especially, adolescents in Jeongseon have more likely gambling behaviors, and the gambling beliefs were more dysfunction than ones in Gwhachoen and Whachoen. And adolescents in Whachoen had the lowest gambling motivation. Also, the correlation between the impulsivity and gambling-related behaviors was significant. The implication of this study was as fellow. When planing the politic intervention for preventing the problem gambling in the future it was necessary to consider the distance from the gambling facilities as environmental component and impulsivity as personal component.

• Journal of Korean Clinical Health Science
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• v.11 no.1
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• pp.1644-1653
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• 2023

Purpose: The purpose of this study was to investigate the effect of kinesio taping application on static and dynamic balance during ankle stabilization exercise. Method: H University in Gunsan is recruiting subjects with unstable ankles (N=12). The 12 subjects were randomly divided into groups (n=6) that performed ankle stabilization exercises by applying kinesio taping and groups that performed ankle stabilization exercises only (N=6). Exercise was done twice a week for 4 weeks. All groups conducted the same exercise program, including stretching, for 40 minutes. The exercise program was conducted in the following order. It was conducted in the order of 5 minutes of stretching, 30 minutes of exercise program, and 5 minutes of finishing stretching. To measure the change in static and dynamic balance, the experimenter and control group measured the change by conducting the Cumberland ankle instability tool, the Y-balance test, and the Stork balance standing test (SBST). Results: There was a statistically significant difference in static and dynamic balance between the group with kinesio taping (experimental group) and the group without kinesio taping (control group) in patients with chronic ankle instability. However, there was no statistically significant difference in static and dynamic balance before and after intervention between groups. Conclusion: These results were expected to help improve dynamic and static balance in ankle instability when applying kinesio taping and balance exercises, but there was no significant difference between the experimental group and the control group because the experiment period was short.

• Korean Journal of Culture and Social Issue
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• v.29 no.4
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• pp.617-636
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• 2023

The goal of this study was to explain the phenomenon of making efforts to overcome the need-reality collision as a cultural characteristic of Koreans. Specifically, we examined whether the behavior varies depending on the degree of relational agency in the situation where conflicts between one's needs and reality have occurred. To this end, a total of 217 participants participated in the online experiment, and the data of 156 participants were finally analyzed. After responding to the relational agency scale, the participants were exposed to a decision-making scenario in which conflicting factors existed. The scenario were about buying a house and making a wedding hall contract, and in each scenario, two important values were set to conflict with each other in the market. Participants read the scenario and entered the level they wanted for each value. After that, they encounter a situation in which he or she has not found the candidate site corresponding to the level he or she wants. Then, the participants responded to their willingness to make additional efforts themselves. As a result of the study, the degree of relational agency of the participants showed a positive relationship with the degree of additional effort. In addition, the degree of the desired level beyond the reality (expectancy discrepancy) showed a nonlinear (reverse U-shape) influence on the additional effort while controlling for individual difference. Furthermore, the interaction effect between relational agency and expectancy discrepancy was significant. Specifically, individuals with low agency did not have a significant relationship between the degree of expectancy discrepancy and the dependent variable, but individuals with high relational agency had a significant non-linear relationship between the degree of expectancy discrepancy and the dependent variable. Based on the results of the study, the role and function of Koreans' psychological characteristics (relational agency) in the scene of managing needs-reality collision were discussed.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.9 no.2
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• pp.174-179
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• 1998

Objective：Present study investigated the relationship between mothers' self-perception and perception of children's problems. Method：Subjects were 63 children, mothers, who visited child & adolescent psychiatric clinic. Their mothers completed Minnesota Mulpiphasic Personality Inventory(MMPI) & Korean Personality Inventory for Children(KPI-C). Correlation between validity scales of mothers' MMPI and validity scales of KPI-C was analysed, and then we divided subjects into two group(High & Low Group) according to the MMPI validity scales, and compared KPI-C's validity scales by student t-test. Result：There were significant positive correlation(r=.30) between K scale of MMPI and L scale of KPI-C, significant negative correlation(r=-.32) F scale of MMPI and L scale of KPI-C. The Means of T scores did show significant difference according to MMPI F, K scales in KPI-C L scale, to MMPI L scale in KPI-C F scale. Conclusion：These results indicated that defensive mothers tend to perceive her child's problems more defensively. However mothers who exaggerate their problem more severely, do not exaggerate their children's problem. Therefore, these result suggested that we should be careful not to underestimate children's problem whose mother elevated in K scale of MMPI.