• 대한공업교육학회지
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• v.35 no.2
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• pp.43-69
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• 2010

This study aims at analyzing the research trend in Electricity, Electronics, and Communication Subject since 1973, which is the beginning year in research in Electricity, Electronics, and Communication Subjects, up to the present year of 2010. We also try to provide explicit directions and suggestions for future researches. A total of 98 studies, including master's and doctoral theses, were collected through RISS(Research Information Sharing Service), KISS(Koreanstudies Information Service System), and DBPIA(special database for domestic research information). Three researchers reviewed them using analytic method. The results were as follows. Of the researches analyzed, 2 studies(2.04%) were in 1970's. The researches in Electricity, Electronics, and Communication Subjects were not actively performed until 1996. Since then, 92.86% of total studies have been done so far and the number of research activities in these subjects are shown to be continuously growing. 50 studies were related with Curriculum and instruction area. Design/Development of Instruction Material area was the most popular topic, and Education Assessment area the least. Research design was mainly descriptive, and studies in academic journals were more than the dissertations. Research mostly focused on the students and the teachers as subjects. University was the main research agency where studies were carried out.

• 대한공업교육학회지
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• v.31 no.2
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• pp.177-202
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• 2006

The purpose of this study was to determine the present teaching competency level and the educational needs of electricity electronic communication technical teachers. The population was electricity electronic communication technical teachers, 750 teachers were sampled for this study. A survey questionnaire consisted of teaching competencies scale including 3 domains based on Performance-Based Teacher Education Modules. The professional competencies scale consisted of 5-point Likert-type 30 items for them to rate the importance and also to indicate the teaching competency level. A questionnaire was mailed to the sample and 443 returned questionnaires were analyzed after data cleaning. The educational needs of teachers were calculated by using the Borich's needs assessment formula. The findings of this study were as follows. 1) electricity electronic communication technical teachers perceived all the thirty competencies as highly important ones. 2) They perceived that their current teaching competency level was just beyond the ordinary level but was lower than the good level. 3) The highest needs were 'determining learning level & interests of students', 'applying problem solving techniques', 'reconstructing lesson contents', 'establishing lesson objectives'. 4) They have a different level of educational needs on the competencies according to their gender, terminal education level, year of teaching experience, practical work experience, school type(national public school/private school), and school location.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.188-190
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• 2022

본 연구에서는 정전류(Constant Current) 방식에 전압강하법을 이용하여 접촉저항 측정 시스템을 구현하고 측정값을 블루투스 통신을 통해 안드로이드 운영체제에서 확인할 수 있도록 앱을 개발한다. 측정가능한 범위로 0 Ω에서 10.24 Ω 사이의 접촉 저항을 MCP3424 18 bit 분해능 ADC를 사용하여 측정할 수 있도록 설계하였다. 기존에는 반고정 저항과 별도의 전류계를 이용하여 정전류를 설정하였으나, 본 연구에서는 측정의 정밀도 및 편리성 개선을 위해 0.1% 고정밀 고정저항을 병렬로 4개 연결하여 구현하였으며, 또한 1:1 Unity Gain Buffer를 구성하고 Ultra High Precision Z-Foil 방식으로 오차 0.01%, 온도 계수 0.05 ppm/℃ 저항을 사용하여 실제로 측정한 샘플 저항 값의 결과를 확인하였다.

• 대한공업교육학회지
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• v.31 no.2
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• pp.128-154
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• 2006

In the knowledge-based society, the quality of education is the core factor of national development. Above all, for improving educational quality, it is important to advance teacher's quality. Therefore, in order to maintaining high-level quality of education, it is required to select and appoint competent teacher. It deserves emphasis on importance of teacher recruitment test for maintaining high-level quality of education in this changes of age. Specially, Secondary School Teacher Recruitment Test of Electricity Electronics Communication Subject is declined qualitatively as each Subject of Electricity Electronics Communication is integrated and criterion of examination is obscured. This research analyzed The seventh curriculum and curriculum of Institution of Teacher Education of Electricity Electronics Communication Subject and already known examination of it On the basis of analyzing result, A field, proportion and points of examination decided through a expert conference are as follow: first, Teacher Recruitment Test of Electricity Electronics Communication Subject consists of subject pedagogics and contents. a proportion of subject pedagogics is 20% and subject contents is 80%. second, a subfield of subject contents consists of industrial education, industrial curriculum, industrial instruction method, practical guidance method, management of practical field organization, assesment of industrial education, industrial-educational cooperation and vocation and career education. third, subject contents consists of a common special, foundation special and application special field. a common a proportion of special field is 7.4%, foundation special is 20% and application special field which consists of electric field(21.3%), electronic field(21.3%) and communication field(10%) is 52.6%. fourth, Teacher Recruitment Test of Electricity Electronics Communication Subject execute practical technique test after finishing writing test.

• Journal of the Semiconductor & Display Technology
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• v.16 no.3
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• pp.31-35
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• 2017

We have fabricated flexible and stretchable pressure sensors using silver nanowires (AgNWs) and analyzed their electric responses. AgNWs are spray coated directly onto uncured polydimethylsiloxane (PDMS) such that AgNWs penetrate into the uncured PDMS, enhancing the adhesion properties of AgNWs. However, the single-layered AgNW sensor exhibits unstable electric response and low pressure sensitivity. To tackle it, we have coated a conductive polymer, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) onto the AgNW layer. Such a hybrid bilayer sensor ensures a stable electric response because the over-coating layer of PEDOT:PSS effectively suppresses the protrusion of AgNWs from PDMS during release. To enhance the sensitivity further, we have also fabricated a stacked bilayer AgNW sensor. However, its electric response varies depending sensitively on the initial overlap pressure.

• Journal of the Semiconductor & Display Technology
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• v.21 no.4
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• pp.39-44
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• 2022

Using a CFD (computational fluid dynamics) simulation tool, we have offered a design guideline of a slot-die head having a simple T-shaped cavity through an analysis of the fluid dynamics in terms of cavity pressure and outlet velocity, which affect the uniformity of coated thin films. We have visualized the fluid flow with a transparent slot-die head where poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) is injected. We have shown that the fluid dynamics inside the slot-die head depends sensitively on the cavity depth, cavity length, land length, and channel gap (i.e., shim thickness). Of those, the channel gap is the most critical parameter that determines the uniformity of the pressure and velocity distributions. A pressure drop inside the cavity is shown to be reduced with decreasing shim thickness. To quantify it, we have also calculated the coefficient of variation (CV). In accordance with Hagen-Poiseuille's laws and electron-hydraulic analogy, the CV value is decreased with increasing cavity depth, cavity length, and land length.

• Journal of the Semiconductor & Display Technology
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• v.22 no.3
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• pp.28-35
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• 2023

Moiré patterns emerge due to the interference between the non-emission area of the LED screen and the grid line in an image sensor of a video recording device when taking a video in the presence of the LED screen. To reduce the moiré intensity, we have fabricated an anti-moiré filter using hollow glass microspheres (HGMs) by slot-die coating. The LED screen has a large non-emission area because of a large pitch (distance between LED chips), causing more severe moiré phenomenon, compared with a display panel having a very narrow black matrix (BM). It is shown that HGMs diffuse light in such a way that the periodicity of the screen is broken and thus the moiré intensity weakens. To quantitatively analyze its moiré suppression capability, we have calculated the spatial frequencies of the moiré fringes using fast Fourier transform. It is addressed that the moiré phenomenon is suppressed and thus the amplitude of each discrete spatial frequency term is reduced as the HGM concentration is increased. Using the filter with the HGM concentration of 9 wt%, the moiré fringes appeared depending sensitively on the distance between the LED screen and the camera are almost completely removed and the visibility of a nature image is enhanced at a sacrifice of luminance.

• Journal of Korean Electronics
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• v.1 no.2
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• pp.44-51
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• 1981

• 대한공업교육학회지
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• v.44 no.1
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• pp.52-71
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• 2019

The quality of school education is a key element for national education development. An important factor that determines the quality of school education is qualities of teachers who are in responsible for school education in the field. Therefore, it is necessary to hire competent teachers in the teacher appointment exam for the secondary school. This necessity is evident especially for vocational high schools and Meister high schools with the introduction of 2015-revised curriculum based on NCS that separates each three subjects, "Electrical, Electronics Communication" resulting in the change of question mechanism, which requires new designing of assessment and content area. So, this study analyzes curriculum in college of education for "Electrical", "Electronics", "Communication", 2015-revised curriculum based on NCS and the development of standards for teacher qualifications and assessment area and evaluation of teaching ability in the subjects of the teacher appointment exam, "Electrical, Electronics Communication" Engineering" in 2009. The assessment area and content elements of "Electrical", "Electronics", "Communication are extracted from the analyzed results and they are verified by experts' consultation and presented as follows; First, the assessment area and content elements of the "Electrical" subject were designed to evaluate the NCS - based 2015 revised curriculum by presenting the NCS learning module to the evaluation area and content element in the basic subject "Electrical and Electronics Practice". Second, the section of "Electronics" presented the assessment area and content elements applying the Electronic Circuit, basic subject of the NCS and it also added "Electromagnetics", which is the basic part of Electronics in the Application of Electromagnetic waves that could be applied to the assessment. Third, the assessment area and content elements of "Communication" consist of the communication-related practice that is based on "Electrical" and "Electronic", considering the characteristics of "Communication Engineering". In particular, "Electrical and Electronics practice" which adds network construction practice and communication-related practice makes it to be able to evaluate the communication-related practical education.

• The Magazine of Kiice
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• v.8 no.1
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• pp.46-52
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• 2007