• Design & Manufacturing
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• v.8 no.2
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• pp.7-11
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• 2014

The Core-Shift is often generated on injection mold which have thin and long core. And Core-Shift brings out problems for thickness variation and product ejecting process. In this study, analysis of Core-Shift was performed according to change of materials of core(steel P-20, Be-Cu) and various polymers(PP, PC) by using MoldFolw MPI 6.1 which is commercial injection molding analysis program. As the results of analysis, the magnitude of Core-Shift was increased as being use polymer had lower fluidity and lower rigidity core. In the future, we will study the relationship between amount of Core-Shift and ejecting force.

• Journal of Digital Convergence
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• v.14 no.6
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• pp.285-294
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• 2016

The purpose of this study was to examine the effectiveness(knowledge of core fundamental nursing skills, clinical competency, self-efficacy and learning motivation) of education program for core fundamental nursing skills focusing on endotracheal suctioning using recording video with smartphone and formative feedback for nursing school students. Subjects consisted of 54 sophomore nursing students, an experimental group(n=27) and a control group(n=27). The education for core fundamental nursing skills using recording video to smartphone and individual formative feedback was provided to students in an experimental group. The traditional method with self-directed practice for 4 hours was offered to a control group. The education program for core fundamental nursing skills using recording video with smartphone and formative feedback was effective in promoting knowledge of core fundamental nursing skills, clinical competency, self-efficacy and learning motivation. Based on our results, this program can be recommended as an effective educational program for the nursing students to improve their core fundamental nursing skills.

• Journal of Positioning, Navigation, and Timing
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• v.10 no.4
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• pp.235-242
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• 2021

Unmanned Aerial Vehicles (UAVs), which were used for military purposes, are gradually expanding their application fields under the influence of electrification and digitalization. Starting from the field of aerial imaging and Intelligence Surveillance and Reconnaissance (ISR) mission, nowadays the possibility of Urban Air Mobility (UAM), which transports passengers and cargo with drones, is widely under discussion. In order to occupy the rapidly growing global unmanned aerial vehicle market in advance, it is necessary to secure core technologies and develop key UAVs components based on the new technologies. In the navigation field, it is necessary to secure a precise position with guaranteed reliability and continuity, unrelated to the operating environments. The reliability and continuity should be secured in the algorithm level and in the H/W component levels also. In order to achieve this technical goal, the Ministry of Science and ICT has launched the 'Unmanned Vehicle Core Technology Research and Development Program' in 2019 to support the R&D on the unmanned vehicle technologies. In this paper, authors introduce the unmanned vehicle core technology research and development program to the related researchers. The authors summarize the backgrounds of the program and show the technological tasks and objectives on the sub-programs in the unmanned vehicle navigation program. We present the program schedules especially focused on the test and evaluation of the developed technologies and components.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.25 no.2
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• pp.47-56
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• 2019

Background: The purpose of this study was compare and analyze the Cobb's angle, core muscle strengthening in adolescents with idiopathic scoliosis and provide scientific basis for effectively treating idiopathic scoliosis in the future. Methods: The subjects of this study were 20 members of adolescent girls. Measurement tools were comprised Cobb's angle test, core muscle strengthening test. After 8 weeks of program, both groups had the same measurements as before program start. Results: The results of the study are as follows. First, the experimental group was decreased statistically significantly in Cobb's angle than the control group. Second, Both groups were increased statistically significantly in core muscle strengthening. The experimental group was increased statistically significantly direction in front, back l than the control group. Conclusion: Sling exercise with core exercise was effective in the decrease of Cobb's angle and core muscle strength than general scoliosis exercise in adolescents with idiopathic scoliosis.

• Journal of The Korean Association For Science Education
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• v.43 no.6
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• pp.583-594
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• 2023

This study aimed to develop an e-PBL program for high school students using COVID-19 related data and to investigate the impact of the developed program on students' science core competencies. For this, the e-PBL program was developed in consideration of the characteristics of learners and e-PBL, and a science core competency analysis framework. The program was applied to 26 general high school life science club students. Test for science department core competency was conducted before and after class by questionnaires and their conversation data during class was collected and analyzed by the framework. As a result of the study, the developed program was effective in improving five science core competencies. In the results of the analysis of the science core competency questionnaire, there were significant effects on scientific thinking ability, scientific inquiry ability and scientific problem solving ability. Unlike in the results of the questionnaires, the five sciences department core competencies appeared evenly in student discourse analysis. Among them, scientific communication ability and scientific participation and lifelong learning ability did not show significant results in the questionnaire, but in the discourse analysis results. Both abilities were the most evenly displayed competencies through the program stages. Through the study, we expect that the program is possibles to be useful instructional material to make high school students increase science core competencies.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.04a
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• pp.58-58
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• 2005

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.04a
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• pp.46-46
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• 2005

• 한국전산유체공학회:학술대회논문집
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• 2003.10a
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• pp.248-250
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• 2003

Thermal analysis is performed to protect the propulsion system of low-earth-orbit earth observation satellite from unwanted thermal disaster like propellant freezing. To implement thermal design adequately, heater powers for the propulsion system estimated through the thermal analysis are decided. Based on those values anticipated herein, the average power for propulsion system becomes 22.02 watts when the only one redundant catalyst bed heater is turned on. When for the preparation of thruster firing, 25.93 watts of the average power is required. All heaters selected for propulsion components operate to prevent propellant freezing meeting the thermal requirements for the propulsion system with the worst-case average voltage, i.e. 25 volts.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.11a
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• pp.438-438
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• 2005

• Proceedings of the Korea Society for Simulation Conference
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• 2005.05a
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• pp.89-92
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• 2005

Each 3D visualization program has its own different structure as for the purpose. This paper describes the design and development of an on-line 3D core data visualization program, $RocDis^{TM}$, for the nuclear simulator. It is possible to analyze the inside of the core status including neutron flux, relative power, moderator and fuel temperature in 3D distribution. Some of other essential information, axial flux distribution etc. could also display in 2D graphs. This program would be design, tuning and training for the simulator core model.