• 대한공업교육학회지
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• v.39 no.1
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• pp.66-84
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• 2014

The purpose of this study is to develop STEAM hand-on activity task for middle school manufacturing & automation unit. This study was conducted following three stages. First of all, I carried out documents research and requirements analysis. And the goals for STEAM hand-on activity were set at this stage. Second, topics for STEAM hand-on activity were selected, and the organized for designing hand-on activity related STEAM in the development step. Finally, pilot and field test were conducted in order to amend and/or complement in improvement step. The theme and/or title of the hand-on activities were 'Making the print using wood', 'Making the close up photography & telephoto lens for smart phone'. The STEAM hand-on activities were designed for ten hours for each subject respectively. Each hand-on activity consists of problem situation, objectives statement, materials and tools, an evaluating criteria, related knowledge, portfolio and so on.

• 대한공업교육학회지
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• v.45 no.2
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• pp.131-158
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• 2020

The purpose of this study is to develop and apply an informal engineering education program for engineering education that is realized outside the framework of formal education. To this end, a non-format engineering education program was developed and rationalized, discussing participants' experience in participating in the program. The developed non-format engineering education program was applied to 90 high school learners interested in engineering in a one-night, two-day camp format, and the goal was confirmed through open surveys and in-depth interviews. The goal of the non-format engineering education program is to understand the importance of engineering and engineering design in real life and the principles of engineering design processes, and to use a variety of knowledge and tools to creatively solve engineering problems creatively. In addition, education programs were developed based on the fact that real-life examples allow engineers to understand what they do, design their own careers, and collaborate with colleagues to share various engineering issues and develop communication skills on engineering topics.

• 대한공업교육학회지
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• v.33 no.1
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• pp.282-296
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• 2008

Present automobile robot welding use $CO_2$ inert gas as a shielding fluid. The inert gas is spreading out and consumable. This present welding mechanism interfered with the welding nozzle. After welding several places have welding defects. Therefore, to reduce the $CO_2$ inert gas and to avoid interference with the material and to increase production modified nozzle which composed of cap and tip are needed. Suggested modified nozzle assembly composed of two stages i.e. $1^{st}$ and $2^{nd}$ stage. At the second stage it has 8 holes which is 3mm of diameter around the circumference. On the base of experimental results the inert $CO_2$ gas discharge reduced to 47% and welding defects decreased also. Modified two stage welding cap can be applied to the present robot welding machine and save the prime cost.

• 대한공업교육학회지
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• v.33 no.1
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• pp.249-264
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• 2008

In this dissertation, shallow $p^+-n$ junctions were formed by ion implantation and dual-step annealing processes and a new simulator is designed to model boron diffusion in silicon. This simulator predicts the boron distribution after ion implantation and annealing. The dopant implantation was performed into the crystalline substrates using $BF_2$ ions. The annealing was performed with a RTA(Rapid Thermal Annealing) and a FA(Furnace Annealing) process. The model which is used in this simulator takes into account nonequilibrium diffusion, reactions of point defects, and defect-dopant pairs considering their charge states, and the dopant inactivation by introducing a boron clustering reaction. FA+RTA annealing sequence exhibited better junction characteristics than RTA+FA thermal cycle from the viewpoint of sheet resistance and the simulator reproduced experimental data successfully. Therefore, proposed diffusion simulator and FA+RTA annealing method was able to applied to shallow junction formation for thermal budget. process.

• 대한공업교육학회지
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• v.31 no.2
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• pp.332-349
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• 2006

The purpose of this study is to identify the relationship between the University students' learning styles in an e-learning according to the major field and learning styles in an e-learning according to the psychological types. The results of the research are as follows: First, The Major field made no difference to the learning styles in e-learning. E-learning styles of University student are as follows : the environment-dependent and self-directed learning style, positive and cooperative learning style, environment-independent and self-directed learning style. Second, In comparison with the boys and girl's the learning styles in e-learning, there were individual differences. But the environment-dependent and self-taught learning style was the highest learning style in Boys and Girl's but, especially there was more high in Girl's. Third, Amount to use internet made no difference to the learning styles in e-learning. The difference of learning styles in an e-learning environment according to Extraversion-Introversion, Sensing-Intuition, Thinking-Feeling among Psychological Types were statistically meaningless.

• 대한공업교육학회지
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• v.31 no.1
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• pp.185-199
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• 2006

In this paper, to detect lateral direction sound pressure fiber optic sensor using Fabry-Perot interferometeric sensor array was fabricated and experimented. This parallel sensor array composed of one light source and the light split into each sensor using directional coupler and to see the output signal the array system do not need any digital signal processor. As a lateral direction sound source arbitrary sound frequency of 100Hz, 200Hz, and 655Hz using by nondirectional speaker were applied to the array sensor which installed on $60cm{\times}60cm{\times}60cm$ latticed structure. The detected signals from the two sensors were analyzed in the time and frequency domains. It was confirmed that the suggested sensor array detected applied sound source well but there were a little amplitude differences in between the sensors. Because the sensor supported simply at both ends theoretical analysis was performed and its solution was suggested. To compare the theoretical and experimental results arbitrary sound frequency of 2kHz was applied to the sensor array. It shows that experimental results was good agreement with theoretical results.

• 대한공업교육학회지
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• v.31 no.1
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• pp.23-45
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• 2006

The purpose of this study is to develop a instructive strategy model of cooperative learning for practical class in technical high school. To achieve this purpose, this study has conducted related literature investigation and interviewed with professionals for reconstruction of practice contents. As a result, 15 steps instructional strategy model of cooperative learning was designed and this model based on traditional 4 steps model, Jigsaw and STAD model which have been verified as effect. To complete the final project, all the team members must cooperate themselves and tutor their peers with learning guides which are constructed as a modular system. This instructional strategy model which is correlated with modular instruction, peer tutoring and cooperative learning is expected to enhance students' school work of psychomotor domain as well as cognitive domain and affective domain.

• 대한공업교육학회지
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• v.31 no.2
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• pp.257-306
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• 2006

The purpose of this study is to establish the major areas that will have to be considered in designing the Blended Learning in university class, and to provide an actual aid to the instructors that intends to design and practice the 'Blended Learning' by developing a practical and the 'Prescribing Blended Learning Design Model' on the basis of real precedent cases. In order to accomplish above study problems, I established the following study problems, and I have results by study problems. a. The major domain for designing the 'prescribed blended learning' for university class application was set up. b. The 'prescribed blended learning design process' for university class application and its character classified by each stages was presented. c. The 'prescribed blended learning design model' synthesized the blended learning design process and its character was presented. To carry out above problems, I have accomplished a literature study, investigation study, and formative precedent study.

• 대한공업교육학회지
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• v.33 no.1
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• pp.233-248
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• 2008

Stream Control Transmission Protocol(SCTP) is a new transport protocol that is known to provide improved performance than Transmission Control Protocol(TCP) in multi-homing environment that is having two and more IP addresses. But currently single-homed computer is used primarily that is having one IP address. To identify whether mean transfer time for SCTP is faster that for TCP in single-homed environment considering packet loss, we make up real testbed regulating the bandwidth, delay time and packet loss rate on router and observe the transfer time. We write server and client applications to measure SCTP and TCP mean transfer time by C language. Analysis of these experimental results from the testbed implementation shows that mean transfer time of SCTP is not better than performance of TCP in single homed environment exceptional case. Main reasons of performance are that SCTP compared to TCP stops transmitting data by timeout and data transmission is often delayed when SACK congestion happens. The result of study shows that elaborate performance tuning is required in developing a new SCTP module or using a implemented SCTP module.

• 대한공업교육학회지
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• v.32 no.1
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• pp.55-72
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• 2007

The purpose of this study is to improve specialized high school of electrical field-to-work transition by a SWOT Analysis. The subject analyzed the curricula of 12 special highschool and surveyed 192 vocational teachers of them. In this study, a SWOT matrix was filled to improve transition from electric special high school to work, and the results was gotten as follows: First, the government should offer the military service special case for students of electric special high school, strengthen the course of CEO for the school master, and make the system to expand job training. Second, the provincial office of education should aid a functional training with a administrative ability and financial support, offer a list of industry visiting teachers to specialized high school, and promote a modification of the department according to a growth industry of the area. Third, each school should present a school education goal agreed with the purpose of specialized department and intensify the counselling of job selection and the application of the approved textbook.