• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.9
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• pp.1575-1583
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• 2008

Wireless sensor network has merit of low-power, low-cost and self-organization network, so there are many researches substituted for existing wire network. As structure reinforcement work need a high accuracy, many sensors are installed in structure and connected with data logger for monitoring. However this wire data logger method takes a long time to install wires and installed wires obstruct to work. Additionally, wire data logger method represent sensor data by only numeric and graph, it is not able to support a rapid decision-making for working. To resolve wiring problem and support decision-making, we designed and implemented the monitoring system based in wireless sensor network. For verifying performance, accuracy and availability, we simulated and tested our system in real field. Consequently, wireless sensor network method is easier to install and deploy than wire data logger method, user is able to monitor instinctively and overall by 3D representation of structure and sensors, and it show not only accuracy but also performance for many sensors.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.34 no.5
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• pp.263-270
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• 2021

In this study, a reliability-based design optimization of a 130-m class fixed-type offshore platform, to be installed in the North Sea, was carried out, while considering environmental, material, and manufacturing uncertainties to enhance its structural safety and economic aspects. For the reliability analysis, and reliability-based design optimization of the structural integrity, unity check values (defined as the ratio between working and allowable stress, for axial, bending, and shear stresses), of the members of the offshore platform were considered as constraints. Weight of the supporting jacket structure was minimized to reduce the manufacturing cost of the offshore platform. Statistical characteristics of uncertainties were defined based on observed and measured data references. Reliability analysis and reliability-based design optimization of a jacket-type offshore structure were computationally burdensome due to the large number of members; therefore, we suggested a method for variable screening, based on the importance of their output responses, to reduce the dimension of the problem. Furthermore, a deterministic design optimization was carried out prior to the reliability-based design optimization, to improve overall computational efficiency. Finally, the optimal design obtained was compared with the conventional rule-based offshore platform design in terms of safety and cost.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.4
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• pp.284-292
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• 2019

The purpose of this study was to analyze the factors influencing the clinical nurse's self-leadership and self-efficacy on job involvement. The survey was conducted from October 20 to December 15, 2017 for 205 nurses working at hospitals located in D city and K province of Korea. Analysis was performed with descriptive statistics, independent t-test, one-way ANOVA analysis, Scheffe's post-hoc test, Pearson correlation analysis, and stepwise multiple regression using the SPSS 21.0 for Windows. The results of the study were as follows. Average score for self-leadership was 3.58, for self-efficacy was 3.56, and for job involvement was 3.36. This study showed positive correlations between self-leadership, self-efficacy and job involvement. Self-leadership, marital status, self-efficacy, and job position were significant influences on job involvement. The explanatory power of influence factors was 43.7%. Based on the results of this study, it is necessary for nursing organizations and hospitals to actively support programs that enhance self-leadership and self-efficacy, which will be used to increase nurses' job involvement and improve productivity and efficiency of nursing work.

• Journal of Energy Engineering
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• v.27 no.4
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• pp.64-69
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• 2018

The purpose of this study is to expand the use of coal ash and coal slag in thermal power plants. In addition, controlled low strength materials was developed to prevent mine settlement. Bottom ash and KR slag are mixed at ratio of 7:3 to expand the use of industrial by-products through carbonate reaction and inhibit the exudation of heavy metals. In order to efficiently fill the abandon mine, workability and physical properties were evaluated according to flow. As a result of elution of harmful substance experiment, it was confirmed that the carbonation reaction inhibited the elution of heavy metals. It was confirmed that the difference in water ratio was the difference in specific surface area of the controlled low strength materials. It was confirmed that the working efficiency is excellent when the flowability is 300mm compared to 260mm. compressive strength measurement result was relatively high at 260mm compared to 300mm because the number of pores due to decrease of water ratio was small.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.7
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• pp.414-422
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• 2019

The purpose of this study was to explore the predictors of turnover intention among nurses working in general hospitals. The subjects were 181 nurses who worked in two general hospitals in Gyeonggi-do, Korea. Data were collected from June to November 2018, and analyzed by descriptive statistics, Independent t-test, One-way ANOVA, Pearson's correlation coefficients, and Stepwise multiple regression analysis, using SPSS/WIN 21.0. The main findings of this were as follows. The mean scores for the nursing work environment, professional self-concept, job satisfaction and turnover intention were $2.43{\pm}0.38$, $2.60{\pm}0.25$, $2.59{\pm}0.29$ and $3.43{\pm}0.72$ points. Turnover intention is negatively correlated with the nursing work environment (r=-.43, p<.001) and job satisfaction (r=-.46, p<.001). Factors influencing turnover intention were job satisfaction(${\beta}=-.47$, p<.001), nursing work environment(${\beta}=.32$, p<.001), professional self-concept(${\beta}=.20$, p<.001), and total length of a clinical career(${\beta}=-.15$, p<.05) showing an explanatory power of 38%. Since various variables influence the turnover intention of nurses, it is necessary to improve the nursing environment in the medical field rather than the strategy to increase the number of simple nurses. In the university, education for establishing through introductory nursing specialty is needed.

• Journal of Internet of Things and Convergence
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• v.8 no.6
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• pp.35-47
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• 2022

This study aims to identify the degree of job stress related to COVID-19, emotional labor, empowerment, and retention intention of nurses in hospitals dedicated to infectious diseases, and confirmed the effect of job stress related to COVID-19, emotional labor, and empowerment on retention intention. The data collection of this study was conducted from August 27, 2021 to September 17, 2021 through a structured questionnaire targeting 162 nurses at an infectious disease hospital in S city. The data were analyzed analyzed using frequency and percentage, mean and standard deviation, t-test, ANOVA, Pearson's Correlation Coefficient, and multiple linear regression using SPSS/WIN 25.0. As a result of analyzing differences according to general characteristics, retention intention showed a significant difference according to work department and work satisfaction. And as a result of analyzing the correlation between retention intention and COVID-19 related job stress, emotional labor, and empowerment, it showed a significant negative correlation (r=-0.215, p=0.006) with job stress related to COVID-19 and a significant positive correlation (r=0.343, p<0.001) with empowerment. As a result of multiple linear regression analysis, job satisfaction, job stress related to COVID-19, and empowerment were identified as significant variables affecting retention intention (F=23.751, p<0.001), and the explanatory power was 30.0%. Through the above results, we intend to provide basic data for strategic development for efficient nursing manpower management.

• Journal of Digital Convergence
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• v.18 no.12
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• pp.377-387
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• 2020

The purpose of this study is a descriptive research study to identify the emotional labor, ethical climate, job satisfaction, and retention intention of nurses in general hospitals, and to identify the relationship between variables and factors influencing the retention intention. The study subjects were 198 nurses working in four general hospitals, and data were collected from September 18 to September 30, 2019 using a structured questionnaire. The collected data were analyzed by t-test, ANOVA, Pearson's correlation coefficients, and multiple regression using SPSS WIN 25.0. As a result of the study, there was a positive correlation between ethical climate(r=.345, p<.001) and job satisfaction(r=.388, p<.001), but emotional labor (r=-.153, p=.031) showed negative correlation. Factors influencing the retention intention of general hospital nurses are job satisfaction(β=.27, p=.001), age(β=.27, p<001), ethical climate(β=.16, p=044), and the explanatory power of the variable was 24.2%. In order to increase the retention intention of general hospital nurses, it is necessary to increase job satisfaction and create a sound ethical climate, and to develop an intervention program that can increase the retention intention by age.

• Journal of the Korean Applied Science and Technology
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• v.38 no.3
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• pp.813-823
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• 2021

This study was conducted to identify the factors affecting the compliance of standard precautions for nurses working in long term care hospitals. As a result of the analysis, 8.50 points in perception of the standard precautions, 3.76 points in health beliefs(subcategories- 4.03 points in perceived sensitivity, 4.04 points in perceived seriousness, 3.91 points in perceived benefits, 3.54 points in perceived barrier, 2.92 points in cues to action), 37.90 points in compliance status of the standard precautions. The performance of the standard precautions was positively correlated with perception of the standard precautions(r=0.419, p=.001) and health beliefs (r=0.443, p<.001), perceived sensitivity (r=0.169, p=.044), perceived barrier(r=0.486, p<.001), perceived benefits (r=0.207, p=.013), cues to action (r=0.204, p=.014). The compliance status of the standard precautions was influenced by the perceived barrier(β=0.373, p<.001), cues to action (β=0.271, p<.001), perception of the standard precautions(β=0.245, p=.004)explanatory power was 32.5%.

• Journal of Drive and Control
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• v.17 no.4
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• pp.133-140
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• 2020

Traction performance of a tractor varies depending on soil conditions. Sinkage and slip of the driving wheel for tractor frequently occur in a reclaimed land. The objective of this study was to develop a tractor suitable for a reclaimed land. Traction performance was evaluated according to soil conditions of reclaimed land and paddy field. Field experiments were conducted at two test sites (Fields A: paddy field; and Field B: reclaimed land). The tractor load measurement system was composed of an axle rotation speed sensor, a torque meter, a six-component load cell, GPS, and a DAQ (Data Acquisition System). Soil properties including soil texture, water content, cone index, and electrical conductivity (EC) were measured. Referring to previous researches, the tractor traveling speed was set to B3 (7.05 km/h), which was frequently used in ridge plow tillage. Soil moisture contents were 33.2% and 48.6% in fields A and B, respectively. Cone index was 2.1 times higher in field A than in field B. When working in the reclaimed land, slip ratios were about 10.5% and 33.1% for fields A and B, respectively. The engine load was used almost 100% of all tractors under the two field conditions. Traction powers were 31.9 kW and 24.2 kW for fields A and B, respectively. Tractive efficiencies were 83.3% and 54.4% for fields A and B, respectively. As soil moisture increased by 16.4%, the tractive efficiency was lowered by about 28.9%. Traction performance of tractor was significantly different according to soil conditions of fields A and B. Therefore, it is necessary to improve the traction performance of tractor for smooth operations in all soil conditions including a reclaimed land by reflecting data of this study.

• The Journal of the Convergence on Culture Technology
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• v.7 no.3
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• pp.43-50
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• 2021

The purpose of this research is to confirm the degree of awareness, knowledge and attitude for the safety management of patients in elderly care facilities, to investigate the factors that affect the safety performance of patients by nursing caregivers, and to provide basic material for the development of educational programs for strengthening performance. The research target audience was 142 nursing caregivers working in the G metropolitan city and S city elderly care facilities, and the data collected from 7/10/2020 to 7/28/2020, were analyzed with the SPSS/WIN 21.0 program. The ability of a nursing caregiver to perform patient safety is increasing as a result of higher education, higher patient safety awareness, and also more positive attitude towards patient safety. The major factors that affect the safety performance of patients by nursing caregivers were attitude toward patient safety, patient safety awareness, and the amount of participation in patient safety education. It's explanatory power was 26.9%. Based on the results of this research, we propose a study to confirm the positive effects of patient safety consciousness and attitude by confirming the education program completed by nursing caregivers and systematizing the education method and design in the education program of nursing caregivers.