• 정보교육학회논문지
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• 제21권6호
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• pp.675-690
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• 2017

4차 산업혁명 시대를 맞이하여 증거기반의 교육정책을 위해, 전국단위의 진단평가 데이터를 수집하기 위한 시스템을 구축 활용하고 있다. 본 연구는 이러한 전국 단위 초 중생이 활용하고 있는 진단평가관리시스템의 사용성 개선을 도울 수 있는 휴리스틱스 개발을 목적으로 하였다. 이를 위해 Nielsen의 기본 휴리스틱스를 비롯하여 교육적 목적에 종속적으로 개발된 휴리스틱스에 대한 선행연구를 기반으로 유사시스템인 진단 보정학습시스템의 사용성 문제를 분석함으로써 휴리스틱스 초안을 개발하였다. 이는 델파이 방법을 통해 15명의 전문가에 의해 2회의 타당화 과정을 수행함으로써 수정 보완되었고 최종안이 도출되었다. 본 연구는 교육 맥락에서 사용성 평가도구를 제공함으로써 전국단위의 관계자(교사 등)와 학생들이 활용하는 시스템의 사용성 개선을 위한 기반을 마련하였다는데 의의가 있다.

• 한국과학교육학회지
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• 제32권8호
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• pp.1356-1366
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• 2012

As the recent demand for human resources in science, technology, engineering, and mathematics (STEM), the development of professional STEM teacher is called worldwide. It is becoming a critical need in teacher education in order to educate student teachers, and prepare pre-service and beginning teachers for high quality of teaching competency. To promote the competency for $21^{st}$ century STEM teachers, the epistemology of technological pedagogical content knowledge (TPACK) is currently considered as the essential qualities of knowledge for highly qualified teachers. The aim of this study is explore the effect of case-based learning approach on TPACK competency of pre-service STEM teachers. In order to develop the pre-service teachers' competency regarding effective integration of technologies into teaching specific content areas, a series of innovative case study teaching in science and mathematics was presented to 43 participants of pre-service physics, chemistry, biology, mathematics, and computer teachers during a course of information and communication technology (ICT) in Education at Khon Kaen University, Thailand. After finishing a case presentation, the pre-service teachers were encouraged into a forum of critical open discussion by considering the potential impact of the case and the TPACK framework. They were investigated instructional design competency of using ICT tools into student learning process and their personal beliefs about ICT in educational process both before and after. The participant's reactions and learning was evaluated by using a self-reported questionnaire and an implementation log of content-specific learning process design, respectively. Results showed a change of their beliefs and the transformation of their TPACK competency in STEM teaching. In an effort to better serve the needs of high quality STEM teachers, the results of this study illustrated that the competency of TPACK could be particularly considered as a core attributes for future STEM teachers. By the way, case-based learning approach can play an effective part in preparing and professing the TPACK competency for STEM teachers.

• Structural Engineering and Mechanics
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• 제78권1호
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• pp.87-102
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• 2021

Long span cross-rope suspension structure is an innovative structural system evolved from typical Cross-Rope Suspension (CRS) guyed tower, a type of supporting system with short span suspension cable supporting overhead power transmission lines. In mountainous areas, the span length of suspension cable was designed to be extended to hundreds or over one thousand meters, which is applicable for crossing deep valleys. Vortex Induced Vibration (VIV) of overhead power transmission lines was considered to be one of the major factors of its fatigue and service life. In this paper, VIV and its controlling by Stockbridge damper for long span CRS was discussed. Firstly, energy balance method and finite element method for assessing VIV of CRS were presented. An approach of establishing FE model of long span CRS structure with dampers was introduced. The effect of Stockbridge damper for overall vibration of CRS was compared in both theoretical and numerical approaches. Results indicated that vibration characteristics of conductor in long span CRS compared with traditional tower-line system. Secondly, analysis on long span CRS including Stockbridge damper showed additional dampers installed were essential for controlling maximum dynamic bending stresses of conductors at both ends. Moreover, factors, including configuration and mass of Stockbridge damper, span length of suspension cable and conductor and number of spans of conductor, were assessed for further discussion on VIV controlling of long span CRS.

• 공학교육연구
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• 제8권3호
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• pp.57-68
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• 2005

본 논문은 프로젝트 학습을 적용한 공학컴퓨터프로그래밍 수업의 효과를 분석하고 그 문제점을 찾아 수업을 개선하는 데에 목적이 있다. 전통적인 강의 수업과는 달리, 본 공학컴퓨터프로그래밍 수업에서는 프로그래밍 프로젝트를 통하여 공학적 문제들을 해결하게 함으로써 학생들이 문제해결 능력과 팀워크 능력 등을 함양할 수 있도록 하였다. 프로젝트 학습의 효과를 알아보기 위해 수강생을 대상으로 설문조사를 실시하였다. 설문은 크게 5개 영역(학습효과, 학습량, 능력습득, 과제, 의견), 5점 척도형 문항으로 총 20개였으며, SPSS 통계프로그램을 사용하여 상관분석, ANOVA 등을 실시하였다. 연구결과에 의하면, (1) 프로젝트 학습은 강의식 수업에 비하여 실제 문제를 해결하고 팀워크 능력을 함양하는데 효과적으로 나타났으며, (2) 자기주도학습력과 정보수집력은 유의미한 상관이 있었고, (3) 가상 학습 공간은 자율학습을 하는데 도움이 되는 것으로 나타났다. 그러나 (4) 과제의 분배나 학습난이도에 대해서는 부정적인 결과가 나타났다. 결론적으로 좀더 나은 프로젝트 학습을 위해서는 학생의 수준에 맞는 과제를 개발하는 일이 요구된다고 할 수 있다.

• 농촌계획
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• 제11권4호
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• pp.17-24
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• 2005

The sustainable development of local communities is faced with limitation due to poor infrastructure and lack of cooperation among stake-holders. To overcome such circumstances and thus to ensure balanced development of the local communities, the central government is driving construction of innovative cities mainly through transfer of public institutions to local cities. In this study, to contribute to the development of plans for the future agropolis' associated with the transfer of public institutions, efficient organization mechanisms of the agropolis such as basic structure and spatial allocation was examined through analyses of advanced cases(Sophia Antipolis, St. Hyacinthe Science Part Food Valley, Stoneleigh Park) of foreign countries. The analyses showed that the organization of agropolis were consisted of three main components; 1) agricultural and food industry complex conducting R&D, 2) service facilities(information, trade, consulting and advertisement) supporting agricultural and food industries and rural enterprise center in charge of a variety of events including exhibition, rural experience, education, and contest, 3) silver facilities such as hospital and town providing medical service and residence. Based on the results, inventories of facilities which are necessary in 'the future agropolis' and their spatial allocation were suggested.

• Journal of Mechanical Science and Technology
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• 제15권7호
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• pp.876-888
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• 2001

For a large scaled optimization based on response surface methods, an efficient quadratic approximation method is presented in the context of the trust region model management strategy. If the number of design variables is η, the proposed method requires only 2η+1 design points for one approximation, which are a center point and tow additional axial points within a systematically adjusted trust region. These design points are used to uniquely determine the main effect terms such as the linear and quadratic regression coefficients. A quasi-Newton formula then uses these linear and quadratic coefficients to progressively update the two-factor interaction effect terms as the sequential approximate optimization progresses. In order to show the numerical performance of the proposed method, a typical unconstrained optimization problem and two dynamic response optimization problems with multiple objective are solved. Finally, their optimization results compared with those of the central composite designs (CCD) or the over-determined D-optimality criterion show that the proposed method gives more efficient results than others.

• 대한기계학회논문집 C: 기술과 교육
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• 제5권1호
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• pp.1-6
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• 2017

센서는 특정 물질을 '감지'하는 단순한 '검출기'로부터 시작되었지만, 수십 나노미터 이하 크기의 신소재, 마이크로미터 이하 크기를 가공하는 반도체 제조공정기술과 같은 나노/마이크로 공학이 접목됨으로써 데이터 처리, 통신 등의 신호처리 기능이 내장된 초소형 스마트 센서로 발전되고 있다. 최근 단순 통화 기능에 터치 가속도 이미지 센서, 인터넷 접속, 사용자에 의한 손쉬운 '앱' 소프트웨어 추가 기능 등이 합쳐진 스마트 폰의 폭발적인 보급으로 인하여 국내외 스마트 센서 산업의 시장이 급속히 확대 중이다. 또한 무인 운전 자동차, 웨어러블 전자기기, 지능형 로봇의 보급이 향후 본격화된다면, 다양한 스마트 센서의 개발 및 산업화가 더욱 많이 필요할 것으로 예상된다.

• 한국세라믹학회지
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• 제55권5호
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• pp.419-439
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• 2018

Piezoelectric materials are essential parts of the electronics and electrical equipment used for consumer and industrial applications, such as ultrasonic piezoelectric transducers, sensors, actuators, transformers, and resonators. In this review, the development of piezoelectric materials and the figures of merit for various electromechanical applications are surveyed, focusing on piezoelectric crystals, i.e., the high-performance relaxor-$PbTiO_3$-based perovskite ferroelectric crystals and nonferroelectric high-temperature piezoelectric crystals. The uniqueness of these crystals is discussed with respect to different usages. Finally, the existing challenges and perspective for the piezoelectric crystals are discussed, with an emphasis on the temperature-dependent properties, from cryogenic temperatures up to the ultrahigh-temperature usage range.

• 대한금속재료학회지
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• 제48권3호
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• pp.218-224
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• 2010

Direct copper electroplating on Mg alloy AZ31B was carried out in a traditional pyrophosphate copper bath containing potassium fluoride. Electrochemical impedance spectroscopy and polarization methods were used to study the effects of added potassium fluoride on electrochemical behavior. The chemical state of magnesium alloy in the electroplating bath was analyzed by X-ray photoelectron spectroscopy. Adhesion of the copper electroplated layer was also tested. Due to the added potassium fluoride, a magnesium fluoride film was formed in the pyrophosphate copper bath. This fluoride film inhibits dissolution of Mg alloy and enables to electroplate copper directly on it. A dense copper layer was formed on the Mg alloy. Moreover, this copper layer has a good adhesion with Mg alloy substrate.

• 공학교육연구
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• 제16권6호
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• pp.45-51
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• 2013

본 연구의 목적은 현업적용도 평가를 실시하여 교육과정, 교육방법, 교육환경 등의 교육시스템 개선 방안을 도출하는 것이다. 이를 위해 현업적용도 개념과 이론을 탐색하였다. 연구방법으로는 노혜란, 박선희(2011)가 개발한 현업적용도 연구도구를 활용하여 30명의 기계공학과 졸업생을 대상으로 설문 및 반구조화된 문항으로 인터뷰를 실시하였다. 현업적용도 설문결과 대학에서 배운 전공교과목이 업무와 관련 정도가 평균 4.27로 나타나 매우 높은 것으로 측정되었다. 뿐만 아니라 현업에 적용하는 기회도 평균 4.10으로 나타나 현업활용도가 높은 것으로 나타났다. 교육과정에 관한 설문결과는 현업에서 필요한 전공 및 교양과목이었다고 생각하느냐에 대한 문항에 평균 3.90의 결과가 나타났고, 현업적용을 높이는 실제적인 문제나, 사례, 경험 등이 활용되는 수업을 받았는지에 대한 문항에 평균 2.63으로 낮은 점수를 나타냈다. 인터뷰 결과 대학의 교육과정은 전공의 경우 현업에 대부분 직접적으로 활용되는 것으로 나타났다. 특히 전공동아리 활동, 팀프로젝트 등의 활동을 한 것이 현업에서 긍정적인 영향을 주는 것으로 나타나 지속적으로 강화해야 하는 것으로 조사되었다.