• Journal of Adhesion and Interface
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• v.5 no.3
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• pp.18-22
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• 2004

By using JKR technique, the surface energy of a solid material and the intrinsic work of adhesion between two materials were determined. JKR technique is based on the contact mechanics, and is now being accepted as a new method which can overcome the demerits of the existing test methods such as contact angle measurement and other adhesion test. In this study, the surface energy of polydimethylsiloxane (PDMS) is measured by JKR method and the experimental results and the applicability of JKR apparatus were discussed.

• Journal of the Korean Society of Safety
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• v.38 no.3
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• pp.61-68
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• 2023

This study performed a structural performance evaluation of a system scaffolding for elevator installation work developed in previous studies. The structural performance was evaluated via a structural test conducted to apply the working load specified in the design standard. The deflection of the horizontal member and the stress of each member constituting the system scaffolding were measured. Consequently, the structural safety evaluation including structural behavior and required performance was performed using the deflection and stresses measured from the structural test. The structural test and safety evaluation results based on the heavy working load corresponding to the design load indicated that the deflection, which is the performance criterion of the horizontal member, did not exceed the allowable value. Further, each member's stress, which is a safety evaluation indicator, did not exceed the allowable strength for both horizontal and vertical members with bending behavior and fordable bracing with tensile behavior, while also satisfying the required safety factor. In addition, the results confirmed the safety against deformation, partial damage, and destruction owing to excessive and maximum load. Therefore, the system scaffolding developed in this study satisfies both the structural performance and safety required by the design standards; thus, it can be applied to elevator installation work sites.

• Journal of Korean Elementary Science Education
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• v.21 no.1
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• pp.111-125
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• 2002

The aim of this study is to make it sure how pupils' science inquiry skills and attitude are influenced when they are taught by using the work-sheets for the differentiated learning according to their ability. In order to accomplish this aim, two classes of the fourth grade in the elementary school were distinguished into two groups: one was the experimental class and the other, the comparative class. The experimental class was given 52 hours of science lessons using the above sheets, and the comparative class, the general method of teaching. In order to compare their scientific interest and learning ability of the two groups each other, pupils were tested the standardized achievement in advance. The two groups were also given "ex post facto test" to measure the variation of their inquiry skills and attitude after the lessons. In addition, the experimental class was tested to measure their learning attitude after they are teamed the science with the sheets. The results of this study are as follows: 1. According to the percentile statistics of the science inquiry skills test between the two groups, the work-sheets for the differentiated teaming helped pupils develope their inquiry skills remarkably. 2. The work-sheets did not lead to significant difference between the learning ability of boys and girls. 3. The science lesson using the work-sheets showed positive influences in increasing pupils' scientific attitude. 4. About 77.2 percent of pupils accepted the excellent records of the evaluation in the science lesson using the sheets. It can be, therefore, concluded that the science lesson using the work-sheets for differentiated teaming is one of effective science lessons to increasing pupils' science inquiry skills, compared with the general teaching method.

• Journal of Digital Convergence
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• v.16 no.4
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• pp.175-184
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• 2018

This study aimed to identify the effect of emotional intelligence, nursing work environment on nursing performance in clinical nurses. Data were collected through a self-report questionnaire for 222 subjects and analyzed using descriptive statistics, t-test, ANOVA, and multiple regression with SPSS WIN 22.0 program. The results showed that nursing performance had significant correlations with emotional intelligence and nursing work environment. Also, the influencing factors on nursing performance were emotional intelligence, age, nursing satisfaction, nursing work environment, and nursing unit. These factors explained 50.0% of variance. Therefore, emotional intelligence, age, nursing satisfaction, nursing work environment, and nursing unit should be considered in developing and applying an nursing interventions program to improve the nursing performance among clinical nurses.

• The Journal of the Korea Contents Association
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• v.16 no.1
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• pp.568-577
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• 2016

The purpose of this study is to verify the moderating effect of perceived wellness climate in the relationship where work-family conflict influences individual engagement. For this, survey was executed on employees of 11 companies including IT, service, manufacturing and etc. After the survey was executed, statistical analysis was executed. This study executed validity test, credibility test, and Hierarchical Linear Regression. The analysis result is as follows. First, work-family (family-work) conflict gives negative (-) influence on individual engagement. Second, perceived wellness climate was marginally significant in the relationship between work-family conflict and individual engagement. And the control effect of perceived wellness climate in the relationship between family-work conflict and individual engagement was significant according to statistics. The conclusion states the implications and limitations of this study, and suggests directions on future studies.

• The Journal of Korean Physical Therapy
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• v.28 no.1
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• pp.39-45
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• 2016

Purpose: Physical therapists are likely to be exposed to work-related musculoskeletal pain due to excessive repetitive tasks. This study was conducted to identify the relationship between work-related musculoskeletal pain and quality of life of physical therapists. Methods: A self-reported questionnaires was sent to 200 physical therapists at in Seoul and Kyoungido. The questionnaires was returned by 170 physical therapists. The questionnaire had included 4 items that coveringed demographic information, areas of musculoskeletal problems, pain rating scale, and WHOQOL-BREF. The analysis was completed using descriptive statistics, and differences between pain and demographic variables were identified using the chi-square test. The relationship between work-related musculoskeletal pain and quality of life was analyzed by t-test and Pearson's correlation. Results: The overall prevalence of work-related musculoskeletal pain was 76.8%. The most affected pain sites included the low back (48.8%), shoulder (45.,2%), hand and wrist (43.5%), and neck (33.3%). Pain ratings of subjects with pain was were moderate. There was a A significant difference for the subdomains of quality of life was observed between the subjects with musculoskeletal pain and those without pain. Weak negative correlations (r=-0.28) were observed between pain rating scale and QOL. Conclusion: These findings show that physical therapists appear to be at a higher risk for work-related musculoskeletal pain and physical domain of QOL. Therefore, Ffurther research is needed to investigate examine the effect of risk factors and ergonomics as physical load, general health status on prevalence of musculoskeletal pain.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.5 no.1
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• pp.87-103
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• 1995

Since being granted permission for self-assessment of the work environment by the Department of Labor in 1992, POSCO's Industrial Hygiene Laboratory has participated in domestic and Foreign Quality Control Programs 8 times and has obtained remarkable results. It has made a lot of effort to be a proficient laboratory with the ability to observe and analyse environmental monitoring data. The summary of results is as follows: 1. POSCO's Industrial Hygiene Laboratory has received a "P(Proficient)" grade from the round 115 to round 119 of AIHA/NIOSH PAT Program for analysis of such metals as lead, cadmium, zinc, and chromium, and also has received a "P(Proficient)" grade from its round 119 of for organic solvent analysis, i,e,. Trichloroethylene(TCE), Carbon Tetr-achloride(CTC), 1,2-Dichloroethane(DCE), 1,1,1-Trichloroethane(MCM), Tetrachloroethylene (PCE), Chloroform(CFM), Benzene(BNZ), toluene(TOL), and O-xylene(OXY). 2. In the Quality Control Evaluation Program performed by the Industrial Health Research Institute,Korea Industrial Safety Corporation, POSCO has passed impressively in the3-metal analysis test for lead, cadmium, cupper, and in the 6 organic solvent analysis test for Benzene(BNZ), toluene(TOL), O-xylene(OXY), Trichloroethylene(TCE) and Methyl isobutyl keton(MIBK), n-Hexane with 2 standard deviations. These analytic techniques should be practically applied to various fields, and reliable results of environmental monitoring should be considered to improve the work environment and to keep workers from occupation related diseases.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.17 no.1
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• pp.8-17
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• 2021

The seat leakage test is required after the maintenance work on the valve seat. Either the test has been performed outside of the plant after cutting the valve from the pipe system or the simplified test has been performed so far. It was unable to perform the test at the plant site because it is hard to make a steady pressure on the valve inlet when it is installed in the pipe. This research aims to perform the leakage test in the nuclear power plant while it is installed in the pipe system. The mock-up test is performed by pressurizing the leak-off pipe on the valve body. The result is compared with traditional test result by pressurizing the valve inlet. Furthermore the chamber mock-up tests are performed under various conditions. The leak rate by the developed test using the leak-off pipe is found to be similar but greater than the leak rate by the existing test method. It implies that the test using the leak-off pipe is more conservative than the existing test. The methodology and the equipment which this paper suggests that on-site seat test is possible and the application of the technology could reduce the time and cost for the valve maintenance work significantly.

• Journal of the Korea Safety Management & Science
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• v.6 no.2
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• pp.1-9
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• 2004

The chemical factory deals with dangerous element and more advance, human-error analyzes and becomes effective research for the country and region. This paper analysis the form of work-miss on human-error according to a safety accident for domestic chemical factory from 1999-2002. It include the present contents and raise issues human knowledge, behavior, judgment, sensibility as an important counter plan that makes the safety solution of work miss. For the point of view of human knowledge, it takes color standard for works to be effective in work place. For behavior, the test has been for risk Point of work place and infra worker movement, also the workers performed professional work as classify according to work. For judgement, the valuation sheet is reflected to minimize the human-error and the 3rd supervisor does a cross-check audit beforehand. For sensibility, it is applicable for human relations, information, communication by program to the consciousness and an attitude of worker-supervisor.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2007.11a
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• pp.477-481
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• 2007

The purpose of this study is to provide the ideal forecasting model of cadastral survey work load through the Economeatric Analysis of Time Series, Granger Causality and VAR Model Analysis, it suggested the forecasting reference materials for the total amount of cadastral survey general work load. The main result is that the derive of the environment variables which affect cadastral survey general work load and the outcome of VAR(vector auto regression) analysis materials(impulse response function and forecast error variance decomposition analysis materials), which explain the change of general work load depending on altering the environment variables. And also, For confirming the stability of time series data, we took a unit root test, ADF(Augmented Dickey-Fuller) analysis and the time series model analysis derives the best cadastral forecasting model regarding on general cadastral survey work load. And also, it showed up the various standards that are applied the statistical method of econometric analysis so it enhanced the prior aggregate system of cadastral survey work load forecasting.