• Journal of the Korea Society of Computer and Information
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• v.7 no.4
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• pp.204-210
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• 2002

The self-organizing feature map of Kohonen has disadvantage that needs too much input patterns in order to converge into the equilibrium state when it trains. In this paper we proposed the method of improving the convergence speed and rate of self-organizing feature map converting the interaction set into Dynamic Gaussian function. The proposed method Provides us with dynamic Properties that the deviation and width of Gaussian function used as an interaction function are narrowed in proportion to learning times and learning rates that varies according to topological position from the winner neuron. In this Paper. we proposed the method of improving the convergence rate and the degree of self-organizing feature map.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.1
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• pp.265-274
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• 2019

The paper describes an application of unscented Kalman filter(UKF) for attitude estimation of an unmanned vehicle(UV), which is equipped with a low-cost attitude heading reference system (AHRS). The roll, pitch and yaw required at the correction stage of the UKF are calculated from the measurements of acceleration and geomagnetic field. The roll and pitch are attributed to the measurement of acceleration, while yaw is calculated from the geomagnetic field measurement. Since the measurement of geomagnetic field is vulnerable to distortion by hard-iron and soft-iron effects, the calculated yaw has more uncertainty than the calculated roll and pitch. To reduce the uncertainty of geomagnetic field measurement, the proposed method estimates bias in the geomagnetic field measurement and compensates for the bias for more accurate calculation of yaw. The proposed method is verified through navigation experiments of a UV in a test pool. The results show that the proposed method yields more accurate attitude estimation; thus, it results more accurate location estimation.

• Journal of Convergence for Information Technology
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• v.12 no.4
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• pp.67-76
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• 2022

The purpose of this study was to identify the effects of high fidelity simulation-based education for cardiac arrest emergency nursing applied to nursing students on communication self-efficacy, communication competence, and educational satisfaction. For this study a nonequivalent control group non-synchronized post-test design was used. Participants were 42 nursing students who attended in one university and completed the self-report questionnaire. Data were analyzed through frequency, percentage, mean, standard deviation, x² test, and independent t-test using the SPSS 22.0 program. As a result, communication self-efficacy (t=2.87, p=.007), communication competence (t=2.96, p=.005) and educational satisfaction (t=4.75, p=<.001) were significantly higher than in the control group after high fidelity simulation-based education. High fidelity simulation-based education for cardiac arrest emergency nursing was able to improve communication self-efficacy, communication competence, and educational satisfaction for nursing students.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.5
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• pp.199-206
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• 2018

The study objective was to understand the effects of self-efficacy and occupational value on the major satisfaction of pre-service childcare teachers. A questionnaire survey was conducted targeting 281 pre-service childcare teachers in A city. In the study results, first, pre-service childcare teachers highly perceived the self-regulatory efficacy and confidence of self-efficacy, the intrinsic value of occupational value, and the general satisfaction and perception satisfaction of major satisfaction. Second, there were statistically significant correlations between self-efficacy, occupational value, and major satisfaction of pre-service childcare teachers. Third, the self-efficacy and occupational value of pre-service childcare teachers had positive effects on the major satisfaction. Based on these study results, there should be more diverse research for the formation of proper self-efficacy and correct occupational value, so that students majoring in childcare could perceive the importance of major satisfaction and also perform their childcare jobs with high-quality.

• Journal of the Korea Society of Computer and Information
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• v.25 no.12
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• pp.187-194
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• 2020

In today's process-oriented industries, such as semiconductor and petrochemical processes, autocorrelation exists between observed data. As a management method for the process where autocorrelation exists, a method of using the observations is to construct a batch so that the batch mean approaches to independence, or to apply the EWMA (Exponentially Weighted Moving Average) statistic of the observed value to the EWMA control chart. In this paper, we propose a method to determine the batch size of UBM (Unweighted Batch Mean), which is commonly used as a management method for observations, and a method to determine the optimal batch size based on ARL (Average Run Length) We propose a method to estimate the standard deviation of the process. We propose an improved control chart for processes in which autocorrelation exists.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.38 no.3
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• pp.247-255
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• 1989

This paper proposes an error model with integral action and a pole-place-ment self-tuning controller for robot manipulators in task coordinates. The controller can reject the offset due to any load disturbance without a detailed description of the robot dynamics. The error model parameters are estimated by the recursive least square identification algorithms, and controller parameters are determined by the pole-placement method. A computer simulation study has been conducted to demonstrate the performance of the proposed control system in task coordinates for a 3-joint and 2-link spatial robot manipulator with payload.

• The Journal of the Convergence on Culture Technology
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• v.4 no.2
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• pp.17-25
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• 2018

The purpose of this study was to investigate the relationship among the variables and the influence of academic self-efficacy and self-directed learning ability on the life satisfaction of nursing students. Method : The participants were 340 nursing students in K city, who were surveyed between October 10 and October 17, 2017, using self-report questionnaire. Result: There were positive correlation between academic self-efficacy and self-directed learning ability life satisfaction for nursing students. The variables for life satisfaction addiction where "Self-directed learning ability" (${\beta}=.143$, p=.029) and "Class concentration" (${\beta}=.099$, p=.048), with a coefficient of determination ($R^2$) of 37.0%. Based on these results, it will be necessary to develop educational programs and strategies related with the self-directed learning ability and class concentration disposition to improve life satisfaction of nursing students.

• Journal of the Korean Institute of Intelligent Systems
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• v.8 no.5
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• pp.29-38
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• 1998

This paper proposes the neural network self-tuning PID controller for the load frequency control of 2- areas power system, namely, the prompt convergence of frequency and tie-line power flow deviation. The neural network applied to computer simulation consists of neurons of two inputs, ten hiddens and tliree outputs layer. Neurons of two inputs layer receive the error and its change rate of the system and cutputs layer consists of three neurons for the parameters of the PID controller. The simulation results shows that the proposed neural network self-tuning PID controller is superior to conventional control t~:chniques(Optimal, PID) in dynamic response and control performance.

• Journal of Digital Convergence
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• v.15 no.6
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• pp.273-282
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• 2017

The objective of this study was to verify the mediating effects of self-efficacy between metacognition and learning flow in college students in healthcare field. Participants were 300 college students. Self-administered questionnaire data were collected from November 21 to December 2, 2016. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients and hierarchical regression analysis with the SPSS/WIN 23.0 program. Results are as follows. Metacognition had positive effects on learning flow(${\beta}=.678$, p<.001). Self-efficacy had a partial mediating effect on the relationship between metacognition and learning flow. The findings of study showed that metacognition was very important for enhancing learning flow and self-efficacy influenced these relationship. This study suggested that it is important to develop and implement teaching and learning strategies with improved metacognition in healthcare field.

• The Journal of the Korea Contents Association
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• v.15 no.8
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• pp.304-312
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• 2015

Purpose: This study was to investigate the effects of career education program on career self-efficacy, career adaptability and career stress among nursing student. Methods: A one-group, pre-post design was utilized with 95 nursing students as subjects. The career education program was consisted of four domains((1) Career exploration, (2) Self understanding, (3) Establishment of career planning (4) Practice of career planning) and included counselling, special lectures, simulated job interview, and feedback of interview. The data were analyzed using descriptive statistics, paired t-tests, ANCOVA(SPSS 20.0). Results: The scores on the factors of career self-efficacy(t=4.48, p<.011) and career adaptability(t=3.02, p=.003) increased significantly after the education intervention. The score of career stress(t=-2.45, p=.015) decreased significantly. Career education program is useful in improving career self-efficacy, career adaptability and career stress in nursing students. Conclusions: The results of study suggest that there needs more development and application of career education program.