• Journal of Korean Elementary Science Education
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• v.33 no.1
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• pp.57-68
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• 2014

This study investigated the characteristics of science imaginary pictures drawn by elementary school students and their perceptions of science imaginary drawing. To do this, $5^{th}$ graders (N=107) were selected from 1 elementary school in Gangwon province and were administered the questionnaires. Some of them were also interviewed deeply. The analyses of the results indicated that most students drew science imaginary pictures in 'land' or 'universe' of 'future' than non-science imaginary pictures. In the academic field, 'machine' was most frequently included in their pictures, and 'earth science' or 'building and traffic' was also frequently included. In addition, half of the pictures included two or more fields. Many students perceived positively the educational benefits of science imaginary drawing upon cognitive, affective, and aesthetic aspects. However, they also had several difficulties in the processes of scientific imaginary drawing such as 'difficulties in using artistic skills', 'difficulties in selecting the subject', 'difficulties in imagining', and 'difficulties in expressing my thoughts to pictures'. Educational implications of these findings are discussed.

• Transactions of Materials Processing
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• v.23 no.7
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• pp.413-418
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• 2014

The current study presents experimental and numerical results on the effect of ultrasonic vibrations on a cylindrical cup drawing of a cold rolled steel sheet(SPCC). An experimental apparatus, which can superimpose high frequency oscillations during deep drawing, was constructed by installing on the tooling ultrasonic vibration generators consisting of a piezoelectric transducer and a resonator. Conventional and vibration-assisted cylindrical deep drawing tests were conducted for various drawing ratios, and the limiting drawing ratios(LDR) for both methods were compared. To evaluate quantitatively the contribution from the ultrasonic vibrations to the reduction of friction between tools and material finite element analyses were conducted. Through a series of parametric analyses, the friction coefficients, which minimized the differences of punch load data between the experiments and simulations, were determined. The results show that the application of ultrasonic vibration effectively improves the LDR by reducing the friction between the tools and the material.

• Journal of The Korean Association For Science Education
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• v.34 no.2
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• pp.175-186
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• 2014

This study investigated the influences of pair activity on characteristics of science imaginary pictures drawn by elementary school students and their perceptions of science imaginary drawing. To do this, fourth graders (N=123) from one of the elementary schools were selected and assigned to individual science imaginary drawing (n=61) and paired science imaginary drawing (n=62) groups. The students of each group were administered the questionnaires. The analyses of the results indicated that pair science imaginary drawing was useful in some cognitive aspects (e.g., the understanding of science imaginary drawing, the diversification of topics and times, the generation of scientific ideas, and the elaboration of the pictures) and motivational aspects (e.g., the inducement of interest and intimacy about science, interest about science imaginary drawing, and sociability with friends). However, there were some limitations in positively changing the perceptions of some cognitive aspects (e.g., the acquirement of new scientific knowledge, the remembrance of scientific knowledge, the improvement of the ability to construct scientific logics, and the improvement of scientific imagination) and aesthetic aspects (e.g., the improvement of the abilities to express themes in drawing, paint the picture, and complete the works of art). In addition, the difficulties in imagining, selecting the subject, and expressing could not be overcome; a few disadvantages in the lack of discussion skills were also pointed out.

• Journal of Mechanical Science and Technology
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• v.15 no.7
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• pp.839-846
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• 2001

Some deep drawing characteristics at elevated temperatures were investigated for the SCPI steel sheets by using a Cr-coated die. For this investigation, six different temperatures between room temperature and 250$\^{C}$, and six different drawing ratios ranging from 2.4 to 2.9 were considered. As a result, the limiting drawing ratio, the maximum drawing force and the maximum drawing depth were found to be affected sensitively by temperature, and more stable through-thickness strain distribution was observed at elevated temperatures. Some experimental results compared favorably with theoretical results obtained by using the finite element method.

• Fibers and Polymers
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• v.2 no.1
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• pp.140-143
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• 2001

To better understand the formation of necking in drawing processes of fibers, strain distributions during drawing processes have been analyzed. For simplicity, one-dimensional incompressible steady flow at a constant temperature was assumed and quasi-static model was used. To describe mechanical properties of solid polymers, non-linear visco-plastic material properties were assumed using the power law type hardening and rate-sensitive equation. The effects of various parameters on the neck formation were matematically analyzed. As material property parameters, strain-hardening parameter, visco-elastic coefficient and strain-rate sensitivity were considered and, for process parameters, the drawing ratio and the process length were considered. It was found that rate-insensitive materials do not reach a steady flow state and the rate-sensitivity plays a key role to have a steady flow. Also, the neck formation is mainly affected by material properties, especially for the quasi-static model. If the process length changes, the strain distribution was found to be proportionally re-distributed along the process line by the factor of the total length change.

• Journal of the Korean earth science society
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• v.25 no.3
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• pp.176-184
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• 2004

The concept of 'the lunar and planetary phases' is very difficult to understand and students may have various misconceptions on this concept. A module drawing the lunar and planetary phases was developed with the application of the simplifying conditions method. The effects of instruction using the module drawing the lunar and planetary phases on the conceptual change and the achievement was investigated in the consideration of learners' characteristics (spatial perception ability, science inquiry ability, required pre-requested learning ability). Findings were as follows: 1) This module was effective for learners' conceptual change and achievement, 2) This module had a positive influence for development the learners' characteristics and conceptual change with the middle level of science inquiry ability, the middle and low level of required pre-requisite learning ability, and middle level of the spatial perception ability.

• Korean Journal of Human Ecology
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• v.17 no.4
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• pp.601-608
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• 2008

The purpose of this study was to examine the effects of science activities using drawing on young children's scientific inquiry competences and scientific attitudes. The subjects of this research were a total of 40 young children at age 5 from two classes in G and C child care center which located in G city. The subjects were randomly assigned to two groups. The collected data were analyzed by t-test using SPSS program. The results of this study were as follow: First, experimental group which conducted the science activities using drawing showed significantly higher improvement in sub-factors of scientific inquiry competences, 'perseverance', 'creative', 'critical', and 'volunteering'. Second, experimental group which conducted the science activities using drawing showed significantly higher improvement in sub-factors of scientific attitudes, 'observing', 'measuring', and 'discussion'. Therefor, it might be concluded that science activities using drawing contributed to the development of scientific inquiry competences and scientific attitudes of young children.

• Journal of Mechanical Science and Technology
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• v.15 no.4
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• pp.459-464
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• 2001

The effects of internal air-pressing on deep drawability are investigated in this study to increase the deep drawability of aluminum sheet. The conventional deep drawing process is limited to a certain limit drawing ratio(LDR) beyond which failure will occur. The intention of this work is to examine the possibilities of relaxing the above limitation through the deep drawing with internal air-pressing, aiming towards a process with an increased drawing ratio. The idea which may lead to this goal is the use of special punch that can exert high pressure on the internal surface of deforming sheet during the deep drawing process. Over the ranges of conditions investigated for Al-1050, the local strain concentration at punch nose radius area was decreased by internal air-pressing of punch, and the deep drawing with internal air-pressing was proved to be very effective process for obtaining higher LDR.

• Korean Journal of Agricultural Science
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• v.37 no.3
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• pp.471-479
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• 2010

Forest roads of 16,424km have been constructed as infrastructure for efficient management of forest. The demand of forest road have been also increased steadily with SOC conception for forest management and wood production. But, accuracy verification by completion drawing of forest road needed aspects extration of geographic information to sound like forest road construction and completion drawing. However, verification for completion drawing has not ascertained. This study carried out the evaluation for position accuracy about constructed forest road in Chungcheongnam-do for evaluating horizontal position accuracy of completion drawing of forest road. In result, first of distance of completion drawing and real route designed completion drawing longer than the real route as Gongju 83m, Seosan 66m, Nonsan 27m and Dangjin 19m, respectively. Second, RMSE by point-correspondence was 11m~14.7m, buffering analysis appeared difference of 18~24m. Finally, index of shape was the similar completion and real route through 6.5~7.4 and data information of forest road corresponds to be perfect. For such reasons, the existing completion drawings have a problem that it cannot use graphic information for drawing digital map according to the regulation, and there is an urgent need for improvement to solve this problem in the process of design and construction.

• Proceedings of the Korea Society of Design Studies Conference
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• 2005.10a
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• pp.150-151
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• 2005