• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.225-227
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• 2006

The demand for developing the compact and cost effective commercial version of the photovoltaic power conditioning system(PCS) is now increasing and several commercial products are on the markets. In this paper, several design results of 10kW rated grid-tied photovoltaic PCS system are introduced, and several test results for the system evaluation are also described. The test results verified the validity of the proposed photovoltaic PCS system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.546-549
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• 2004

The T-50/A-50 Golden Eagle was developed for a supersonic trainer and light combat aircraft. At the design stage, vibration control plans were established and applied. For cockpit vibration, crew comfort vibration level was defined by the requirement of MIL-A-8892. It is found that the T-50/A-50 meets the requirement of cockpit vibration from the flight test data analysis. This paper contains the results of cockpit vibration analysis using the flight test data and the results of human vibration analysis lot the pilot inside aircraft. The human vibration level of pilot is increased as dynamic pressure is increased and at the specific high dynamic pressure, the ride comfort indicates 'a little uncomfortable'. Overall analysis results show that the vibration level of T-50/A-50 cockpit is tolerable and not critical for pilot's comfort.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.372-379
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• 2008

In the case of pantograph, three models of HSR350X(G7), KTX-I and KTX-II have been already introduced into the field of domestic high speed train. This thesis intends to explain performance test result of the conditionally purchasing pantograph that is progressing up to now. The pantograph is being developed to localize pantograph that was applied to KTX-I. Also, it consider criteria that applied for verification of design contents and method of dynamic test that verify pantograph's current collecting performance.

• PNF and Movement
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• v.11 no.2
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• pp.119-126
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• 2013

Purpose : The neurologically impaired patients have sensory, motor, cognition, perception problems which cause reduction of body schema, balance control and postural control provoke disfunction. The purpose of this case report was to evaluate effects on gait&balance upon improvement of postural control for left hemiplegia. Methods : This study has performed single subject design from March to April 2013 for 6 weeks. The subject of this study was a 67years old female patient with left hemiplegia. Timed Up and Go (TUG) test and Functional Reach (FR) test were used as evaluation tool. The subject was treated 5 times a week for 30 minutes each. Results : The result is that the walking velocity was decreased, the ability of gait was improved than before the training. The length of FR was increased from 8.33cm to 22.67cm. Conclusion : According to the results, the treatment improves subject's ability of walking in this study.

• Child Health Nursing Research
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• v.28 no.3
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• pp.167-175
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• 2022

Purpose: The present study aimed to develop and examine the effectiveness of a pediatric nursing competency-building program for nursing students. Methods: This was a quasi-experimental study with a nonequivalent control group pretest-posttest design conducted between October and December 2021. The participants included 40 nursing students (20 each in the experimental and control groups) at a university in a South Korean city. The pediatric nursing competency-building program integrated problem-based learning and simulation into clinical field practice. The experimental group participated in the program, while the control group did not. Data were analyzed using the 𝑥² test, the independent t-test, and repeated-measures analysis of variance. Results: Pediatric nursing competency and clinical performance showed a greater increase in the experimental group than in the control group. However, the change in problem-solving ability in the experimental group was not significantly different from that in the control group. Conclusion: The pediatric nursing competency-building program effectively improved students' pediatric nursing competency and clinical performance.

• Journal of Korean Association for Spatial Structures
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• v.23 no.4
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• pp.51-58
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• 2023

In this study, the displacement dependence, strength, and energy dissipation capacity of the steel rod damper were evaluated. The test variables are the number of steel rod dampers and the lateral deformation prevention details. From test results, it was evaluated that the displacement dependence conditions in the structural design code were satisfied. The maximum strength and energy dissipation capacity increased linearly as the number of steel rod increased. In addition, the maximum strength and energy dissipation capacity were evaluated by more than 20 times increased by using of the lateral deformation prevention details.

• The Journal of Korean Academic Society of Nursing Education
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• v.21 no.2
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• pp.202-214
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• 2015

Purpose: The purpose of this study was to develop extracurricular coaching programs to improve communication skills and leadership for nursing students and evaluate the effects of the programs. Methods: The 8-week extracurricular coaching program was developed based on the Joo, Whitmore and Hong models. A quasi-experimental design was used. The subjects were selected by two full-time nursing professors training students at one university in city G. The subjects were chosen from among the advisees of these two professors. Of the students who participated in this study, 29 were in the experimental group and 27 were in the control group. Data was analyzed through t-test and Mann Whitney U-test. Results: The experimental group showed significantly higher post-test scores in communication skills, communication as a nursing outcome, observation of communication, leadership, and leadership as a nursing outcome than those of the control group. However, the experimental group did not reveal significantly higher post-test scores in the number of leadership activities using a portfolio than those of the control group. Conclusion: This extracurricular coaching program can help cultivate important, basic grounding as well as achieve nursing student learning outcomes upon graduation.

• Journal of the Korean Society of Propulsion Engineers
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• v.16 no.2
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• pp.10-16
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• 2012

A computational analysis of nozzle flow characteristics and plume structure is conducted to examine performance of the supersonic nozzle employed in a thruster for ground firing test. At first, flow simulations in two-dimensional converging-diverging nozzle are performed for the verification of computational capability as well as turbulence model validity. Axisymmetric converging-diverging nozzles for ground firing test are analyzed with the k-${\omega}$ SST model. A performance penalty caused by flow separation in a diverging section is observed in initially-designed nozzle. The performance could be enhanced by the modification of the diverging section of nozzle contour.

• Journal of The Korean Society of Agricultural Engineers
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• v.60 no.3
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• pp.123-133
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• 2018

The purpose of this paper is to propose an experimental method to evaluate the resistance of abrasion about 24 MPa, 27 MPa, and 30 MPa compressive strength. These strength are used in the design and construction of concrete hydraulic structures in Korea. The mixing ratios of the ready mixed concrete strengths were investigated countrywide and set the representative mixture proportion ratios of the nine mixed types of OPC, FA and BFS. After making and curing the test specimens, the underwater abrasion test was performed. ASTM C 1138 International Standard was used to fabricate the test equipment, and the surface abrasion resistance of the specimen was tested using the test equipment. In the case of OPC, the 30% abrasion resistance improvement effect was observed at 72 hours as the water-binder ratio decreased. That was reason the coated cement bond strength of the specimen was strong. In the case of BFS and FA, it was improved by 9.9% and 3.8%, respectively, at 72 hours as the water-binder ratio decreased. It was due to the characteristics of the latent hydraulic and pozzolanic reactions. Generally, the relative abrasion resistance of concrete can be evaluated at 24 hours. However, in case of low strength (under 24 MPa), the surface mortar layer wears much faster at the first 12 hours, so it can be considered to evaluate the relative abrasion loss rate at this point.

• Journal of Korean Biological Nursing Science
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• v.17 no.4
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• pp.331-340
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• 2015

Purpose: This study was to develop and evaluate an individualized education program based on self-efficacy for patients with kidney transplantation in Korea. Methods: A nonequivalent control group pretest-posttest design was used. The participants consisted of 43 patients who underwent kidney transplants at one hospital in Seoul, from July 2012 to April 2013. The experimental group received an individualized education based on self-efficacy in the hospital and follow-up telephone consultation in the 2nd and 3rd week after discharge. The control group received a routine discharge education. Knowledge, self-efficacy, and compliance related to kidney transplant were measured and analyzed by frequency, average, Mann-Whitney U test, Fisher's exact test, independent t-test, and ${\chi}^2$-test using SPSS WIN 20.0. Results: Significant differences were found in self-efficacy between the experimental group and the control group. But no significant differences were found in knowledge and compliance between two groups. The scores of several items on monitoring health status in compliance were higher in the experimental group than those of the control group. Conclusion: The results of this study demonstrate the fact that an education program based in self-efficacy for patients with kidney transplant would be effective in improving self-efficacy and the ability to monitor their health status.