• 동력기계공학회지
• /
• 제3권4호
• /
• pp.51-56
• /
• 1999

The ultrasonic method, which is well known as nondestructive test method, is widely used to evaluate the material damage due to degradation. However, this method is just used for measuring the crack size and the thickness loss of the tube. The purpose of this study is to investigate the applicability of the ultrasonic technique for the evaluation of marine diesel engine exhaust valve and to suggest the correlations between the ultrasonic characteristics and valve degradation. From the evaluation of the results obtained, the technique of using the ultrasonic property was founds to be a efficient method to evaluate the degree of marine diesel engine exhaust valve by nondestructive test.

• 한국해양공학회지
• /
• 제9권1호
• /
• pp.47-56
• /
• 1995

This study is aimed to have a database of system development for the prediction, monitoring, analyzing, and evaluation of tensile strength and damage characteristics through AE technique for CFRP. Therefore the correlations between impact characteristics (such as impact velocity, impact energy, delamination area etc) and AE signals for CFRP laminates were investigated. And also it were accomplished the evaluation of tensile strength and the investigation on correlation with AE signals for impact damaged specimen of CFRP laminates.

• 한국산학기술학회논문지
• /
• 제14권8호
• /
• pp.3732-3738
• /
• 2013

본 연구는 문제중심학습에서 튜터, 동료, 자기평가간의 평가점수를 비교하고 평가주체 점수간의 관련성과 평가주체별로 평가에 영향을 미치는 평가영역을 알아보는데 목적이 있다. 이를 위해 문제중심학습으로 수업받는 간호학과 학생 105명을 대상으로 문제중심학습 효과도구를 가지고 3차에 걸쳐 튜터, 동료, 자기평가를 실시하였다. 수집된 자료는 SPSS WIN(V. 12.0)으로 분석하였다. 연구결과 3차례의 수업 모두 자기평가 점수가 튜터, 동료평가 점수보다 높았다. 평가주체별 점수간의 관계는 3차례의 수업에서 튜터평가와 동료평가간에 관련성이 있었다. 평가주체별 평가에 영향을 미치는 평가영역은 튜터평가는 '문제해결능력'이었고, 동료평가와 자기평가는 '협동학습능력'이었다.

• 대한예방한의학회지
• /
• 제26권3호
• /
• pp.73-86
• /
• 2022

Objectives : The purpose of this study was to investigate the satisfaction of students who participated in a role play using the syndrome differentiation CPX (Clinical Performance Examination) scenario in Korean Medicine Classics class, and to find out whether the results were correlated with self-assessment of treatment skills and subject achievement. Methods : In the Korean Medicine Classics class in the first semester of 2022, 44 first-year students in the Department of Korean Medicine completed theoretical education and formative evaluation on the subject of internal damage fever, and then role-played using CPX scenarios. Among them, 41 students consented to the study. Students who agreed to the study answered the satisfaction questionnaire consisting of 13 questions in 2 areas on learning methods and effects, and self-evaluation was conducted according to the evaluation items of medical technology consisting of 23 questions. Satisfaction and self-assessment results were analyzed for correlation, and additionally, correlation with Korean Medicine Classics subject achievement was also analyzed. Results : The result of student satisfaction with the role play was 4.87±0.06 while the result of student self-assessment of clinical skill was 4.73±0.16. The student satisfaction with the role play showed statisticallysignificant correlations with the self-assessment of clinical skill and quiz score of Korean Medical Classics while it did not show correlations with the total score of Korean Medical Classics and paper test. Also, the self-assessment of clinical skill did not show correlations with the total score of Korean Medical Classics, paper test, and quiz. Conclusions : Even though the students who performed the role play using the syndrome differentiation based CPX scenario highly assessed their clinical skill and showed high satisfaction, it did not show significant correlation with the achievement of Korean Medical Classics.

• Journal of Biosystems Engineering
• /
• 제22권4호
• /
• pp.433-438
• /
• 1997

The freshness of apple was evaluated by characterizing the surface texture of flesh cells. The freshness index which was related to the amount of wrinkles on the cell surface was defined to quantify the freshness. Four parameters relevant to the amount of the cell wrinkles were selected and measured using image analysis including wrinkle extraction procedure and Fast Fourier Transform of a wrinkle-extracted image. Out of 4 parameters, three parameters had highly significant correlations with the time elapsed after harvest. But it was concluded that two parameters out of such 3 parameters could be used for description of freshness index.

• Journal of Biosystems Engineering
• /
• 제18권4호
• /
• pp.382-389
• /
• 1993

In this research, the surface color of 'Fuji' apples and tomatoes were measured by using Sharp PD 151 semiconductor color sensors. The measurements were compared with color-difference-meter readings and with visual sensory test scores. A negative exponential function was developed which describe the relationship between the dominant wavelength of the surface color of 'Fuji' apples and the ratio of the photoelectric currents of the color sensor. Also a linear relationship was found for the surface color of tomatoes and the color sensor output. There were good correlations between the visual test scores and the color sensor output for both 'Fuji' apples and tomatoes.

• 월간산업보건
• /
• 통권326호
• /
• pp.66-67
• /
• 2015

• 한국농공학회지
• /
• 제37권E호
• /
• pp.40-46
• /
• 1995

To identify the soft marine clay of the Daebul reclaimed area, the south western part of Korea, and determine their engineering properties, a series of the laboratory and field tests are conducted. The main findings are summarized from laboratory and field investigations. It is also formulated the basic geotechnical characteristic data for the porject area. The established correlations for the engineering properties are reviewed and their applicabilities are studied.

• 월간산업보건
• /
• 통권326호
• /
• pp.64-65
• /
• 2015

• 한국안전학회지
• /
• 제32권2호
• /
• pp.98-104
• /
• 2017

The ultrasonic pulse velocities of pressure, shear, and Rayleigh waves ( P-, S-, and R- waves) have been used for the condition evaluation of various concrete structures, but the statistical distribution according to the wave type has not been studied clearly in view of data reliability and validity. Therefore, this study analyzed the statistical distribution of P-, S-, R-wave velocities in concrete wide beams of $800{\times}3100mm$ (width ${\times}$ length) with a thickness of 300 mm. In addition, we investigated an experimental consistency by the Kolmogorov-Smirnov goodness-of-fit test. The experimental data showed that the R-, S- and P- wave velocities in order have better statistical stability and reliability for in situ evaluation because R- and S-waves are less sensitive to confinement and boundary conditions. Also, good correlations between wave velocities and strength and modulus of elasticity were found, which indicate them as appropriate techniques for estimating the mechanical properties.