• Journal of Engineering Education Research
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• v.13 no.6
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• pp.180-187
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• 2010

Design and management of information and industrial engineering (DMIIE) is a project-oriented junior/senior class that integrates the methodologies of industrial and information engineering in order to solve real-world problems. It examines social issues, engineering approaches to solve the problems and business models that can generate sustainable value for society. This course help students use their engineering knowledge to assess and solve the problems faced by local community. By conducting real-world projects, students get an opportunity to refine their oral and written communication skills. In this paper, the experience of DMIIE course is presented. The effects of the community-based learning for a senior design course are discussed. The possibility of using this blended type of design course to meet the ABEEK outcomes is also stated.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.5
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• pp.87-92
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• 2005

This paper presents a design concept of smart UAV console system and the analysis of its dynamic response to shock and vibration. The console system design is determined by two main elements; the shape design and the mechanical design. The shape design refers to the human engineering aspects according to the military standards for ship borne equipment. The goal of the mechanical design is to provide the required shock and vibration endurance. The endurance of the system is numerically verified by means of Finite Element Method. The results of verification show that six resilient mounts installed on the console allow to sufficiently decrease the influence of the input impact wave on endurance of the system.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.396-396
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• 2017

최근 기후변화에 효과적으로 대응하기 위해서 신뢰성 높은 설계홍수량을 산정할 필요성이 커지고 있다. 설계홍수량 산정법은 홍수빈도해석법과 설계강우법으로 대별된다. 홍수빈도해석법은 홍수량 자료에 대한 통계학적 빈도분석을 실시하여 확률홍수량을 산정하는 방법이다. 홍수빈도해석법은 관측된 자료를 활용하기 때문에 이론적으로 불확실성이 상대적으로 작은 장점을 가지고 있지만, 자료의 수가 적거나 시간에 따라 변하는 유역특성에 대한 불확실성을 함께 고려해야 한다. 관측 유량 자료가 없거나 적은 유역에서는 설계강우법이 주로 사용되고 있다. 설계강우법은 강우자료에 대해서 빈도분석을 실시하여 확률강우량을 산정한 후, 이를 강우-유출 모형에 적용하여 확률 홍수 수문곡선을 작성하고 첨두치를 확률홍수량으로 선정하는 방법이다. 그러나, 설계강우법도 강우-유출 모형에서 유역특성을 나타내는 매개변수 추정과정에서 불확실성을 내포하고 있기 때문에 추정된 홍수량 결과에 대한 불확실성을 감안해야 한다. 또한, 강우량과 홍수량의 발생빈도가 같다는 가정의 명확한 근거가 없다. 더욱이 두 가지 설계홍수량 산정법을 같은 유역에 적용하는 경우라도 종종 매우 다른 결과값을 나타낸다. 따라서, 본 연구에서는 국내 유역의 현실을 고려하여 설계강우법으로 산정된 확률홍수량을 홍수빈도해석법으로 산정된 확률홍수량을 변환할 수 있는 보정식을 개발하였다. 국내 9개의 댐 유역에서 확보된 일 단위 강우량 및 유출량 자료를 홍수빈도해석법과 설계강우법을 적용하여 대상 유역의 설계홍수량을 산정하였다. 그리고, 홍수빈도해석법으로 산정된 설계홍수량을 참값이라 가정한 후, 산정된 설계홍수량의 대상 유역별 오차율을 산정하였다. 이를 바탕으로 홍수빈도해석법과 설계강우법으로 산정된 설계홍수량 간의 관계를 회귀분석을 통하여 설계강우법으로 산정된 확률홍수량을 보정하는 관계식을 제시하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.181-181
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• 2022

상수도 관망은 비정상상황에서도 안전한 물을 안정적으로 공급하는 것을 목표로 한다. 따라서 상수도 관망의 최적 설계는 수리학적 제약조건 (i.e., 절점의 압력, 관의 유속)을 만족하는 설계안을 제시한다. 하지만 점차 커지는 도시 규모에 따라 수질적으로 안전한 물을 공급하지 못하는 문제가 발생하고 있다. 또한, 상수도시스템의 형식 (i.e., 수지상식, 혼합식, 순환식)에 따라 용수의 체류 시간, 절점의 압력 등이 상이하다. 따라서, 본 연구에서는 도시 규모 및 형식과 잔류염소 농도를 고려한 상수도시스템 최적 설계를 진행하였다. 절점의 개수에 따라 도시의 규모를 분류하였으며, BI(BI; Branch Index) 지수를 통해 상수도시스템의 형식을 분류하였다. 또한, 수리학적 제약조건(i.e., 절점의 압력)과 수질적 제약조건 (i.e., 잔류염소 농도)을 설정하여 수리-수질을 동시에 만족하는 최적 설계안을 도출하였다. 비상시에도 물을 안정하게 공급하기 위하여 시스템의 탄력성과 설계비용을 목적함수로 설정하여 다목적 최적 설계를 진행하였다. 이러한 연구는 압력만을 고려한 기존 설계단계에서 수질적 측면을 동시에 고려하여 수질 측면의 안전성을 향상할 수 있다. 또한, 시스템의 탄력성을 고려하여 비정상상황에서도 물을 공급하여 사용성을 향상하는 설계안을 도출하여 수리학적 안정성을 만족하며, 경제적 측면도 향상할 수 있다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.8 no.2
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• pp.50-58
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• 1971

계통공학분야의 가속적인 발전에 따라 통신공학부문에서도 신속정확한 설계를 위한 전자계산기의 활용도가 증가하고 있는 경향을 보고 일본국부사통연구소의 소도연구원조가 여파기의 등화기회로설계를 목적으로 개발한 CAD(Computer-Aided Design) 방식을 소개한다.

• Proceedings of the Korea Society of Design Studies Conference
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• 1999.10a
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• pp.96-97
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• 1999

품질공학은 개발설계 단계에 적용하는 엔지니어링 테크놀로지(engineering technology)로서 매우 독창적이고 효과적인 방법이다. 품질공학이론을 주장한 일본의 다꾸찌박사는 "설계 품질에 대해서 설계자는 매우 세심한 주위를 기울이지 않으면 안 된다." 라고 언급하면서 이 이론을 내놓았다. (중략)

• Proceedings of the KIPE Conference
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• 2018.11a
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• pp.74-76
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• 2018

본 논문에서는 높은 주파수로 동작하는 전기자동차 충전용 자기유도방식 무선전력전송 (inductive power transfer, IPT) 시스템의 2차 측 semi-bridgeless 정류기 (semi-bridgeless rectifier, SBR)의 설계 방법을 제안한다. 높은 주파수 동작 시 SBR에 발생하는 발열 문제와 역회복 현상에 대해 분석하고, 분석 결과를 바탕으로 SBR용 스위치의 설계 요구 사항을 제안한다. 제안하는 요구 사항을 만족하는 SBR 스위치를 최종적으로 설계하고, 3.3kW급 IPT 시스템 prototype을 이용하여 설계 결과를 검증한다.

• 대한공업교육학회지
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• v.39 no.1
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• pp.128-142
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• 2014

The purpose of this study was to provide a basis information for the education direction of 'creative engineering design' lesson to highschool students and pre-technology teachers by analyzing pre-experienced the d epartment of technology professors' recognitions, according to the newly opened unit 'creative engineering design' in 2009 revised highschool technology home economics education curriculum. The survey questionnaire was composed of 34 questions and collected from 16 department of technology education professors. The data was analyzed by SPSS program. The results of study were as follows : First, in 'creative engineering design' educational objectives, the highest average level(M) of response was problem solving ability, the opportunity of engineering experience and creativity improvement were followed. In the response about 'creative engineering design' educational contents, the average level(M) of the creative thinking method education was the highest(3.94). and the following important level was the write training education for presentation. Second, in the 'creative engineering design' educational areas, the professors preferred the idea conception, design, and production manufacturing area. In the teaching learning method, the average level(M) of design-based learning method was the first. and PBL, problem solving method were favored Third, in the 'creative engineering design' lesson manage, the secure of practice room and material cost, and the check of the progress situations were needed preferentially. In the education assessments, various and combined assessment preferred such as production, portfolio, and presentation. Fourth, in the pre-technology teachers' lesson of the university course, the product manufacturing level was preferred production to improve uncomfortable thing in life. The major difficulty in product manufacturing was the lack of major knowledge and product conception.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.21 no.1
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• pp.113-124
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• 2008

Distributed operation of overall structural design process, by which product optimization and process parallelization are simultaneously implemented, is presented in this paper. The database-interacted hybrid method, which selectively takes the accustomed procedure of the conventional method in the framework of the optimal design, is utilized here. The staged application of design constraints reduces the computational burden for large complex optimization problems. Two kinds of numeric and graphic processes are simultaneously implemented by concurrent engineering approach in the distributed environment of PC networks. The former is based on finite element optimization method and the latter is represented by AutoCAD using AutoLISP programming language. Numerical computation and database interaction on servers and graphic works on independent clients are communicated through message passing. The numerical experiments for some steel truss models show the validity and usability of the method. This study has sufficient adaptability and expandability, in that it is based on general methodologies and industry standard platforms.

• Journal of The Korean Association For Science Education
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• v.37 no.4
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• pp.719-730
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• 2017

The purpose of this study is to investigate how engineering design-based STEM research experience affects gifted students' creative engineering problem-solving propensity and attitude toward engineering. The students' creative engineering problem-solving propensity and attitude toward engineering were measured before and after the STEM research experience. The pre-/post-tests results were analyzed by paired t-test with the significance level of p <.05. The conclusions of the study are as follows: First, the engineering design based STEM research experience had a positive effect on the students' creative engineering problem-solving propensity. Over all, the average score of the creative engineering problem-solving propensity increased significantly (p <.05) after the STEM research experience. Second, the average score of gifted-students' attitude toward engineering had increased significantly after the integrated STEM research activities (p <.05). In addition, we analyzed the difference between pre-post results of both instruments based on the gifted students' desired career paths (natural science and engineering) and gender. The result shows that the students' career paths or gender did not affect the results in most of the sub-categories in both instruments. However, the STEM research experience had more positive effect on the female students than male students in term of their 'engineering design ability', which is one of the sub-categories of the creative engineering problem-solving propensity instrument.