• The Korean Journal of Applied Statistics
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• v.9 no.2
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• pp.55-72
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• 1996

It is essential in modern industry that quality and procuctivity are improved continuously. To accomplish this purpose, quality control must be maintained in all parts of a company. Recently, some tire manufacture companies are beginning to show interest in quality control. They have tried to achive some results through the statistical analysis for the experimental data which has accumulated up to now and then they strive to determine the structural relationship between the design factors in tire construction and tire performance characteristics. The measurement data obtained from the construction engineering is given in multivariate form owing to the various properties found in tire design components as wll as in performance. Also it may be existed the relationship among the multimple response variables. Thus we proposes the use of the biplot graphical display as an analytic tool of data matrices with complex respects. The proposed biplots are also availalbe to understand both the underlying structure of the data and the roles played by the different components. In particular, we consider the matter of how best to use the biplots in the maltivariate analysis of variance and multiple response data. Finally we apply this method to analyze the actual data.

• The Journal of the Acoustical Society of Korea
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• v.30 no.8
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• pp.474-481
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• 2011

Conventional beamforming is ineffective in producing directional information in system with sparse degree of the freedom such as DIFAR (DIrectional Frequency Analysis and Recording) sonobuoy and in the presence of high directional noise. In this paper, Adaptive beamforming techniques are applied to produce directional spectra from a small number of sensors in highly directional noise environment. Conventional method as well as minimum variance and eigenvectors as adaptive method are evaluated via numerical test and real data.

• Journal of Korean Elementary Science Education
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• v.24 no.3
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• pp.310-320
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• 2005

The purpose of this study was to investigate young children's environmental literacy level and variables that affected their environmental literacy. Of the students, 969 in third grade from big cities, medium sized cities and rural areas participated in this study, and their environmental literacy was measured through 69 questions consisted of 24 items for knowledge, 22 for attitude, 16 for behavior, and 7 for skills with 13 demographic variables. Eighty minutes were given to answer the questions. Statistical analysis was conducted on each of the categories (knowledge, attitude, behavior, skill) that make up environmental literacy and multivariate analysis variance (MANOVA) was also conducted to investigate variables that affect environmental literacy. Results indicated that the correlation between attitude and behavior is the highest. Also, it was found that a demographic variable might affect one, two, or sometimes all categories of the environmental literacy.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2478-2485
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• 2015

The purpose of this study was to examine the relationship among self-efficacy, college life satisfaction and leisure sport participation level. A total of 259 university students participating in leisure sport from G and D city were analyzed. By using t-test, ANOVA(Analysis of variance), Confirmatory Factor Analysis(CFA) and Structural Equation Modeling (SEM) through SPSS 20.0 and AMOS 20.0 statistics program, this study found the followings. First, there was a moderating effect of leisure sport participation level on the relationship between self-efficacy and college life satisfaction. Second, self-efficacy had a positive influence on college life satisfaction.

• Journal of Digital Convergence
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• v.14 no.4
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• pp.33-42
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• 2016

This study aimed to understand the differences of the factors for learning satisfaction (learning content, system, interaction, instructor personality, and instructional context) between males and females in online graduate university settings. To examine the research objectives, a total of 88 graduate students attending online universities in Seoul, Korea participated in the survey. Among them, 66 valid responses were used for the analyses using the SPSS 21.0 statistical package. In order to figure out the differences of the factors in gender, Multivariate Analysis of Variance(MANOVA) was conducted with the five dependent factors. As a result, interaction was found to be a significant variable implying that females more actively participated in communication process. Finally, possible reasons for the results were described and suggestions were raised.

• The Korean Journal of Rehabilitation Nursing
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• v.20 no.1
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• pp.1-11
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• 2017

Purpose: This was a methodological study to develop a valid and reliable health assessment tool for middle-aged adults in long-term care settings (HATMAL). Methods: At the first stage of this study, initial 56-items HATMAL were derived via literature review, survey for needs assessment, and focus group interviews with experts. At the second stage, 54 items HATMAL were finalized via content validity test with 5 experts and a pilot study with 30 nurses. At the third stage, validity and reliability tests were conducted with 100 middle-aged patients in a long-term care hospital. Data were analyzed by factor analysis using SPSS 18.0 program. Results: Exploratory factor analysis resulted in 3 factors; functional assessment, symptom assessment, and comfort assessment. These 3 factors explained 83.8% of total variance and construct validity was confirmed. Test-retest reliability was .67 for appetite changes, .76 for regulating for behavior problems, and 1.0 for other items. Conclusion: Results indicate that HATMAL is valid and reliable to assess the health for middle-aged patients in long-term care settings. This study would contribute to provide more effective personalized treatment and care for middle-aged patients in long-term care settings considering their own characteristics.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.2
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• pp.253-260
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• 2009

This paper, mathematically analyzes the performance of newly proposed TR-UWB system which the frequency components of a UWB pulse were processed so that the system could be implemented with ADCs of a few MHz sampling rate, and presents the comparison with an existing frequency-domain based TR-UWB system. The comparison is mainly based on the SNR ratio which depends on the mean and the variance of the frequency components. We also shows that the simulation results to support the theoretical analysis where the comparison is made under the IEEE 802.15.3a channel model as well as AWGN channel.

• Korean Journal of Applied Biomechanics
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• v.33 no.3
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• pp.94-100
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• 2023

Objective: Few studies have investigated alterations of ground reaction force (GRF) in individuals with chronic ankle instability (CAI) compared with lateral ankle sprain (LAS) copers and healthy controls during walking. This study aimed to investigate differences in GRF variables among the CAI, LAS coper, and control groups. Method: Eighteen individuals with CAI, 18 LAS copers, and 18 healthy controls were recruited for this study. All participants walked on 8-m walkway with a force plate three times. GRF data during stance phase were extracted and analyzed. The analysis of variance and ensemble curve analysis were used for statistical analyses of discrete points and time-series data respectively. Results: The CAI group showed a greater loading rate (LR) and a shorter time to impact peak force than the other groups, as well as decreased vGRF from 56% to 65% in the stance phase than the control group. No significant differences were noted in the other variables. Conclusion: Based on these findings, individuals with CAI should enhance their ability to create propulsion during the push-off phase and spend more time absorbing GRF to decrease the LR, which is considered one of risk factors for overuse injury and ankle osteoarthritis.

• Journal of Hospice and Palliative Care
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• v.26 no.2
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• pp.80-94
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• 2023

Purpose: This study aimed to identify attitudes toward advance directives (ADs) among female cancer patients and factors related to ADs. Methods: The study was conducted at a university hospital in Seoul from September 19, 2020, to January 20, 2021. The participants were 153 patients diagnosed with gynecological cancer or breast cancer. Data were collected using questionnaires and included general characteristics, disease- and AD-related characteristics, knowledge and attitudes about ADs, and attitudes about dignified death. Data were analyzed using the t-test, analysis of variance, and multiple regression analysis. Results: Only 2% of the participants completed ADs. The mean score for attitudes toward ADs was 3.30, indicating a positive knowledge and attitude toward dignified death. The factors related to attitudes toward ADs were attitudes toward dignified death (𝛽=0.25, P=0.001), experience discussing life-sustaining treatment (𝛽=0.17, P=0.037), preferred time to have a consultation about ADs (𝛽=0.19, P=0.046), intention to write ADs (𝛽=0.15, P=0.038), and Eastern Cooperative Oncology Group Performance Status (𝛽=-0.37, P<0.001). The explanatory power of these variables for attitudes toward ADs was 38.5%. Conclusion: Overall, patients preferred to have a consultation about ADs when they were still active, mentally healthy, and able to make decisions. Education about ADs should be provided to patients on the first day of hospitalization for chemotherapy or while awaiting treatment in an outpatient setting so patients can write ADs and discuss them with family and friends.

• Journal of Hospice and Palliative Care
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• v.25 no.2
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• pp.66-75
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• 2022

Purpose: The purpose of this study was to examine person-centered care, nursing professionalism, the nursing work environment, and empathy capacity among hospice ward nurses and to identify the factors affecting person-centered care. Methods: Data were collected using a self-report questionnaire completed by 120 nurses at 30 inpatient hospice institutions in South Korea from August 24, 2020 to September 8, 2020. The independent t-test, one-way analysis of variance, and Pearson correlation analysis were conducted using SPSS version 26.0. Results: The scores were 3.76±0.45 for person-centered care, 3.58±0.47 for nursing professionalism, 3.24±0.57 for the nursing work environment, and 4.00±0.46 for empathy capacity. There were positive correlations between the variables. Factors that influenced the person-centered care of hospice nurses were being a manager (β=0.20, P=0.002), high nursing professionalism (β=0.20, P=0.012), a better nursing work environment (β=0.15, P=0.033), and high empathy capacity (β=0.51, P<0.001). The explanatory power was 65.3%. Conclusion: To reinforce the person-centered care competency of hospice nurses, it is necessary to improve nursing professionalism, the nursing work environment, and empathy competency. Opportunities for nurses to practice independently must be expanded for nurses to develop nursing professionalism. Sufficient nursing personnel and material resources must be provided to nurses to cultivate a positive work environment. Empathy should be improved by implementing integrated education programs that include nursing practice situations.