• The Journal of the Acoustical Society of Korea
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• v.37 no.6
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• pp.457-467
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• 2018

This paper presents performance comparison of several high-resolution frequency estimation algorithms for pure real tone signal. Algorithms are DFT (Discrete Fourier Transform - for reference purpose), Jacobsen, Candan, reassignment and Cedron. Each algorithm is evaluated under various experimental conditions, e.g., different SNR (Signal to Noise Ratio), window function and window length and performance is compared in the perspective of bias, MSE (Mean Square-Error) and variance. Experimental results indicate that Cedron algorithms works well in the most cases. For actual usage in the engineering problem, each algorithm needs additional analysis and modification.

• Journal of Korean society of Dental Hygiene
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• v.19 no.1
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• pp.45-54
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• 2019

Objectives: The aim of this study was to examine factors influencing job embeddedness in dental clinic hygienists. Through this study, we suggest the necessity to increase job embeddedness and use that as basic data for effective dental personnel management. Methods: A self-reported questionnaire was filled out by 219 dental clinic hygienists from September 8 to October 8, 2018. Data were analyzed using SPSS 20.0. Independent t-test, one-way ANOVA, Scheffe's post-hoc test, and Pearson correlation coefficient were reviewed, and a multiple regression analysis was conducted. Results: Dental hygienists scored 3.14 points in job embeddedness. The variables that influenced clinical job embeddedness were self-efficacy, organizational commitment, and job satisfaction. These factors had 56.7% of variance in dental clinic hygienists. Conclusions: Job satisfaction was the most affected factor for dental clinic hygienists. In order to maintain effective personnel management of dental hygienists, strategic program development and application are needed to improve job embeddedness.

• Journal of Korean Biological Nursing Science
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• v.23 no.3
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• pp.247-255
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• 2021

Purpose: The goal of this study was to see how different aerobic exercise intensities affected AMP-activated protein kinase (AMPK), reactive oxygen, and antioxidant enzymes in young mice during an 8-week period. Methods: Forty male C57BL/6 mice, aged seven weeks, were randomly assigned to one of four groups: control (n=10), low-intensity exercise (n=10), moderate-intensity exercise (n=10), and high-intensity exercise (n=10). For eight weeks, aerobic activity was performed once a day for 35-40 minutes, five days a week. The data were analyzed using descriptive statistics, analysis of variance (ANOVA), chi-squared tests, and the Tukey test in the SPSS/WIN 25.0 program. Results: Weight (p=.001) was substantially different between the moderate-intensity exercise group and the control group in AMPK (p<.001). In addition, there were no significant differences between the moderate-intensity exercise group and the control group in reactive oxygen malondialdehyde (MDA) levels (p=.136) and antioxidant enzyme superoxide dismutase (SOD) levels (p=.521). Conclusion: These findings suggest that moderate-intensity aerobic exercise increased AMPK activation and helped young mice shed weight.

• The Journal of Asian Finance, Economics and Business
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• v.10 no.2
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• pp.213-222
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• 2023

This paper mainly studies the relationship between financial development, inbound tourism development, and economic growth rate in Fujian Province, China. This study uses the data of real GDP, foreign exchange income from international tourism, and financial interrelations ratio from 1994 to 2019. In the analysis process, the Johansen cointegration test is first used to analyze whether the three have a long-term equilibrium relationship. Then the vector error correction model is established to test the restrictive relationship among the three. Next, the Granger causality test assesses whether the three have a causal relationship. Finally, the contribution rate of the three is analyzed by variance decomposition. The above methods show the following conclusions: first, the three have a long-term equilibrium relationship. Secondly, in the short term, local economic growth is constrained by inbound tourism and financial development. Thirdly, there is a causal relationship between economic growth and inbound tourism in Fujian, while there is a unidirectional causal relationship between financial development and economic growth, financial development, and inbound tourism. Fourthly, the contribution rate of inbound tourism to economic growth fluctuations in Fujian is higher than that of financial development.

• Korean Journal of Occupational Health Nursing
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• v.31 no.3
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• pp.114-124
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• 2022

Purpose: This study aimed to identify the predictors of psychological well-being in middle-aged female workers by examining the relationship between positive psychological capital, job stress, and job satisfaction. Methods: Data were collected from 145 middle-aged female workers. A self-report questionnaire was used to assess the level of positive psychological capital, job stress, job satisfaction, and psychological well-being. SPSS/WIN version 23.0 was employed for data analysis. The data were analyzed using descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and multiple regression. Results: The most significant predictors of psychological well-being in the participants were positive psychological capital, living standards, and hobby. These explained 39% of the variance for psychological well-being. Conclusion: We found that positive psychological capital, living standards, and hobby influenced the participants' psychological well-being. Therefore, to improve middle-aged female workers' psychological well-being, developing a program based on positive psychological capital management is necessary.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.31 no.4
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• pp.90-104
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• 2023

This study analyzes the perceptions of college students majoring in aviation services according to the field learning program conducted during their major studies in order to reflect the educational value and academic awareness of the experience of the experiential field learning program. A survey is conducted targeting college students who experience a field learning program conducted by the Aviation Service Department of J University, a four-year university in the Chungcheong region. ANOVA (one-way analysis of variance) is conducted to analyze differences in perceptions of field learning properties, learning satisfaction, academic self-efficacy, and intention to continue studying. Additionally, text mining is conducted using 'Voyant Tools' to analyze students' field trip logs regarding field trip learning program activities. I hope that the results will be used as evidence to build an efficient and systematic learning strategy for operating field learning programs.

• The Korean Journal of Food & Health Convergence
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• v.10 no.2
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• pp.27-36
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• 2024

This study aims to investigate whether information awareness, search purpose, and search expectations influence information avoidance among university students. The data were collected by using a self-completion questionnaire with convenience sampling of students from one university. The collected data were analyzed by descriptive statistics, t-test, analysis of variance (ANOVA), Pearson's correlation coefficient, and multiple regression using R 4.2.3. The main results are as follows: First, both search purpose and search expectations exhibited a significant inverse correlation with all information avoidance dependent variables. Second, there was a significant difference in the mean of search expectations across majors, such that science majors had higher search expectations than humanities majors. Third, there were significant differences in the means of the information avoidance-system and information avoidance variables by major, such that both variables had lower means for the science than the humanities group. Fourth, among the independent variables, search expectation had a significant effect on information avoidance-personal: the higher the search expectation variable, the lower the information avoidance-personal variable. This study confirmed that information avoidance should not only consider the psychological, emotional, and affective aspects of information seekers, but also that information seekers' information search purpose and search expectations are predictors of information avoidance.

• Journal of Advanced Navigation Technology
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• v.1 no.1
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• pp.70-80
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• 1997

In this paper, the performances of two noncoherent code tracking loops, i. e., traditional code tracking loop(TCTL) and modified code tracking loop(MCTL) are analyzed and compared in a CDMA mobile environment. Closed-form formulas for steady-state jitter variance are derived analytically for the two schemes as a function of the pulse shaping filter, timing offset, signal-to-interference ratio, and loop bandwidth. The design issues of the loop filter are also addressed with emphasis on the second-order tracking loop. Finally, the degradation of BER performance due to timing errors is examined in a CDMA reverse link for IMT-2000 designed by ETRI.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.1
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• pp.89-93
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• 2013

This paper is estimating a target direction of arrival with incident to receiver in spatial. This paper presented covariance using constraint matrix to correlation interference signal cancellation in multi input multi output array antennas system. we proposed a target direction of arrival estimation algorithm using cost function and minimum variance method. Through simulation, we were analysis a performance to compare general SPT-LCMV algorithm and proposal algorithm. We showed that proposal algorithm improve more target estimation than general SPT-LCMV algorithm in direction of arrival.

• Child Health Nursing Research
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• v.23 no.3
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• pp.319-328
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• 2017

Purpose: This study was conducted to identify factors affecting health promotion behaviors of upper grade elementary students. Methods: A descriptive study was carried out with 282 fifth or sixth elementary school students from two cities, Korea. Data were collected using self-administrative questionnaires containing items on health knowledge, attitudes, subjective norms, perceived behavior control and health promotion behavior, and analyzed using descriptive statistics, t-test, ANOVA, Cronbach's ${\alpha}$, Pearson Correlation Coefficients, and multiple regression analysis with the SPSS/WIN 21.0 program. Results: There were significant positive correlations between health promotion behavior and health knowledge (r=.36, p<.001), attitudes (r=.41, p<.001), subjective norms (r=.36, p<.001), perceived behavior control (r=.49, p<.001). Perceived behavior control (${\beta}=.38$, p<.001), health knowledge (${\beta}=.26$, p<.001), perceived health status - good (${\beta}=.15$, p=.005) were significant factors affecting health promotion behavior and explained 31%(F=43.29, p<.001) of variance. Conclusion: Results indicate that level of health promotion behavior is appropriate and perceived behavior control is the most important factor for health promotion behavior among the predictors. These findings also suggest that it is necessary to promote perceived behavior control and health knowledge in developing health promotion intervention programs for these students, as well as a need to strengthen education on sex behavior and health, accident prevention and first aid.