• Journal of the Korean Data and Information Science Society
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• v.28 no.4
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• pp.797-810
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• 2017

The Korean peninsula is exposed to typhoons every year. Typhoons cause huge socioeconomic damage because tropical cyclones tend to occur with strong winds and heavy precipitation. In order to understand the complex dependence structure between strong winds and heavy precipitation, the copula links a set of univariate distributions to a multivariate distribution and has been actively studied in the field of hydrology. In this study, we carried out analysis using data of wind speed and precipitation collected from the weather stations in Busan and Jeju. Log-Normal, Gamma, and Weibull distributions were considered to explain marginal distributions of the copula. Kolmogorov-Smirnov, Cramer-von-Mises, and Anderson-Darling test statistics were employed for testing the goodness-of-fit of marginal distribution. Observed pseudo data were calculated through inverse transformation method for establishing the copula. Elliptical, archimedean, and extreme copula were considered to explain the dependence structure between strong winds and heavy precipitation. In selecting the best copula, we employed the Cramer-von-Mises test and cross-validation. In Busan, precipitation according to average wind speed followed t copula and precipitation just as maximum wind speed adopted Clayton copula. In Jeju, precipitation according to maximum wind speed complied Normal copula and average wind speed as stated in precipitation followed Frank copula and maximum wind speed according to precipitation observed Husler-Reiss copula.

• 한국노년학
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• v.29 no.1
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• pp.51-69
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• 2009

The purpose of this study was to identify the effects of death education on attitudes toward death and depression for older adults. A death education program consisted of needs of death education, alternatives for dignity on death, not ending death(I, II), hospice(I, II), and 9 patterns of death(I, II, III). Participants in this study were 38 older adults aged 60 years or older. Attitudes toward death and depression scales for Korean elders were employed. The data collection and intervention were performed from January to June, 2008. The subjects participated in a death education program for 1 time per week during 10 weeks. The data were analyzed with t-test, and Pearson correlation coefficients with SPSS/Window 14.0. After the intervention, the subjects showed significant difference in attitudes toward death compared to that of pre-intervention. The subjects after the intervention showed no statistical differences in change of depression compared to that of pre-intervention. Also, attitudes toward death were negatively related with depression both before and after interventions, but the change of relation was not significant. The findings of this study contributed to extend the base of program developments on death education enhancing attitudes toward death among Korean older adults.

• Journal of the Korea Society of Computer and Information
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• v.17 no.5
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• pp.137-146
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• 2012

In SCM(Supply Chain Management), a management paradigm where the customer satisfaction is to be achieved by minimizing the cost, reducing the uncertainty, and obtaining the overall optimization. As it performs the integrated operation of the paths of information, assets, and knowledge from the raw material providers to the retailers, the adoption of RFID(Radio Frequency Identification) in SCM could be expected to magnify the effectiveness of the system. However, there is a huge risk by deciding whether or not RFID system is adopted without the objective analysis under the uncertain circumstances. This research paper presents the statistical analysis methodologies for the comparison of RFID with Barcode on the aspect of utility and the statistical analysis tool, RUSAT, which was programmed for nonstatisticians' convenience. Assuming a pharmaceutical industry, this paper illustrates how the data were entered and analyzed in RUSAT. The results of this research are expected to be used not only for the pharmaceutical related company but also for the manufacturer, the whole-saler, and the retailer in the other logistic industries.

• The Journal of the Convergence on Culture Technology
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• v.8 no.6
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• pp.355-363
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• 2022

Purpose : The purpose of this study was to investigate the double mediating effect of ego-resilience and impulsivity in the effects of smartphone addiction on depression among office workers. Research design, data and methodology : The subjects of this study were office workers working in four cities: Seoul, Daejeon, Chungnam, and Chungbuk Province, and the total number of respondents was 286. Descriptive statistics, difference test (t-test, ANOVA), correlation analysis, and double-mediated effect analysis were used for statistics. Results : The results of this study are as follows. First, as a result of the difference analysis, there was no difference in depression according to the general characteristics of the subjects of this study, such as gender, age, marital status, and salary. Second, as a result of correlation analysis, smartphone addiction showed a negative correlation with ego-resilience, and a positive correlation with impulsivity and depression. Also, ego-resilience showed negative correlation with impulsivity and depression. Impulsivity showed a positive correlation with depression. Third, as a result of dual mediating effect analysis, it was found that ego-resilience and impulsivity played double-mediated role between smartphone addiction and depression. Conclusions : Based on the results of this study, theoretical measures centered on ego-resilience were discussed and presented in order to positively induce the decrease in impulsivity and depression due to smartphone addiction among office workers.

• Journal of the Korean Society of Radiology
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• v.18 no.1
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• pp.53-63
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• 2024

The purpose of this study was to analyze radiological technologists' (RT) task perceptions of intravenous injection behavior of contrast medium and use it as basic data for future workforce response plans. We surveyed a total of 172 RT using questionnaire terms consisting of demographic characteristics, job priorities, and RT' task perceptions of intravenous injection behavior. Statistical analysis was performed using descriptive statistics, frequency analysis, independent samples T-test, and ANOVA analysis. As a result, first, current clinical RT were highly aware of the need for intravenous injection behavior as a response to the future workforce of them, and the workload burden resulting from this was evaluated as low. Second, the fear of intravenous injection behavior was found to be significant, so it is judged to be useful to perform them as selective job actions rather than all RT' task. Third, the need for training courses and certification for RT' intravenous injection behavior is being raised, and additional specific research on this is required. Last, RT' positive perception of intravenous injection behavior could be expected as a foundation for improving national medical services, strengthening RT expertise, and expanding tasks.

• The Journal of Korean Academy of Prosthodontics
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• v.55 no.2
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• pp.151-155
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• 2017

Purpose: The aim of this study was to evaluate screw removal torque of the two-piece zirconia abutment with the novel titanium component compared to the conventional one-piece titanium abutment in the internal connection implant before and after dynamic cyclic loading. Materials and methods: Two types of the abutment assemblies with internal connection were prepared and divided into the groups; titanium abutment-titanium abutment screw assemblies as control, and zirconia abutment-titanium socket-titanium abutment screw assemblies as experimental group. A total of 12 abutments and implants were used of six assemblies each group. Each assembly was tightened to 30 Ncm. A cyclic load of 300 N at an angle of 30 degrees in reference to the loading axis was applied until one million cycles or failure. The removal torque values (RTVs) of the abutment screws were measured with a digital torque gauge before and after cyclic loading. The RTVs of the pre load and post load were analyzed with t-test, and P-values < .05 were considered statistically significant. Results: The assemblies of both groups survived all after the dynamic cyclic loading test without screw loosening. The statistically significant differences were found between the mean RTVs before and after the cyclic loading in both groups (P < .05). The RTV differences for the control and the experimental group were $-7.25{\pm}1.50Ncm$ and $-7.33{\pm}0.93Ncm$, respectively. Statistical analysis revealed that the RTV differences in both groups were not significantly different from each other (P > .05). Conclusion: Within the limitation of this study, the two-piece zirconia abutment with the titanium component did not show a significant RTV difference of the abutment screw compared to the titanium abutment after dynamic cyclic loading.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.1
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• pp.431-440
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• 2017

The purpose of this study was to investigate the effects of Iyengar yoga practice on the lower body imbalance in middle-aged women. The subjects (n=24), who had not performed yoga training prior to this study (and) were not attending any other training programs, participated after undergoing an X-RAY examination with the Gonstead Technique and then their lower body imbalance (was reevaluated). The subjects completed the yoga program for 12 weeks (3 times per week, 90 minutes per session). The data were analyzed with the paired t-test and alpha was set at 0.05. It was found that 1) the height differences between the right and left iliac crests (p < 0.001), width (p < 0.001) and length (p < 0.001) differences between the right and left iliac fossa, and width differences between the right and left sacrum (p < 0.001) were significantly reduced after the training program. In addition, 2) the lower limb length discrepancy was significantly reduced (p < 0.001). Our data suggest that Iyengar yoga training for 12 weeks reduces the pelvic imbalance and length differences between the right and left lower limbs in middle-aged females.

• The Journal of Korean Academy of Sensory Integration
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• v.13 no.1
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• pp.33-43
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• 2015

Objective : The purpose of this study is to investigate the effect of parent education program with sensory integration approach on the parent's understanding of sensory processing ability of their own children with developmental delays. Methods : The period of this study is from March 15, 2015 to May 10, 2015. The participants of this study were thirty of parents who have children with developmental delays. The participants were randomly divided as experimental group (15 parents) and control group (15 parents) and an educational program was provided to those parents in the experimental group. The education program was developed based on sensory integration approach and 1:1 intensive individual counseling education. Short Sensory Profile (SSP) & a specially designed questionnaire were used to evaluate the parent's understanding of sensory processing ability of their children with developmental delays. The effect of between the groups was analyzed using an independent two samples t-test, and the effect of the intervention within a group was measured using the paired t-test. Results : After the intervention of parent education program, the total score of SSP was significantly decreased and the score of the parent questionnaire was significantly increased (p<.05). Conclusion : The results of this study show that parent education program with sensory integration approach is effective to improve the parent's understanding of sensory processing ability of their children with developmental delays. This study can be used as a good resource for therapists who is planning to provide sensory integration treatment for children with disabilities.

• Journal of Korean Ophthalmic Optics Society
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• v.13 no.1
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• pp.89-94
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• 2008

Purpose: To make a comparative study of correlation between biometry data of size in eyeball and refractive error. Methods: The subjects were 68 normal university students (male 36, female 32) and the average age was 22.85${\pm}$3.12. We measured the students' eyesight by A-scan ultrasound and refractor. The results were examined it's statistical significance by SPSS 12.0 version. Results: The mean of axial length was 24.31${\pm}$1.24 mm, chamber depth was 3.48${\pm}$0.28 mm, lens thickness was 3.56${\pm}$0.26 mm and corneal thickness was 0.55${\pm}$0.03 mm. Male's Axial length and chamber depth were larger than female's. As reflective error decreases the thickness of lens become thicker. The measurement data between right eye and left eye didn't had difference and there was no correlation with result of T-test. There were statistically significant correlation with length and chamber depth, axial length and corneal thickness, chamber depth and corneal thickness, and refractive error and lens thickness (p<0.01). Refractive error and axial length were minus linear regression (r=-0.56). Conclusions: Eye's refractive error was changed by axial length, chamber depth and lens thickness but it wasn't related with sex and whether it is a right eye or a left eye.

• Proceedings of the Korea Association of Information Systems Conference
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• 2005.12a
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• pp.281-295
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• 2005

The study of purpose is to analyze the effects of quality factors of ERP system on organizational performance. Where as many preceding studies have been focused on the factors of general service quality, this study analyzed interrelation between quality factors and organizational performance of corporation implemented ERP system using questionnaire. As compared with preceding studies which mainly concerned with system quality factors and information quality factors, this study specially added service quality to analyzing interrelation with organizational performance. Questionnaire consists of survey for the interrelation between ERP system implemented corporation and organizational performance. The results are as follows. First, quality factors of ERP system effected on organizational performance by t-test. Second, quality factors of ERP system showed significance statistically on the effects of organizational performance by t-test. The results of this study have a great expectation for the role of offering useful insight and information in the field of business and education. First, make sure that quality factors have significant effects on organizational performance when implemented ERP system in the business, investment and research on quality factors should be combined with. Second, in a sense that this study was added to service quality in research of quality factors by the detailed approaches which different from preceding studies, it is of highly practical use. Third, this study presents scientific foundation on quality improvement for quality factors of ERP system.