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실천공학 교육 방법론 : STEM교육을 기반으로 한 미분방정식의 교육
하준홍 ( Jun Hong Ha ) 한국실천공학교육학회 2015 실천공학교육논문지 Vol.7 No.1
본 연구에서는 미국에서 시발된 STEM(Science, Technology, Engineering, Mathematics)교육과 이를 벤치마킹하여 만든 한국의 STEAM(Science, Technology, Engineering, Arts, Mathematics)교육의 실태를 조사하여 대학용 STEM교육을 주관적으로 정의하고 이를 달성하기 위한 방안을 제안한다. 현재의 STEM교육은 초등학교에서 고등학교를 대상으로 하고 있지만, 조만간 그 여파가 대학에까지 미칠 것이 예측되므로 STEM교육을 기반으로 하는 수학교육 방안을 제안한다. 대학 4학년 때에 수행하는 졸업설계작품을 통한 기술(T)과 공학(E)에 대한 탐구활동과 hands-on 활동을 2학년 때에 배우는 수학교과목 중 하나인 미분방정식의 학습도구로 취급하는 새로운 교육 및 학습방안을 제안한다. STEM교육의 중요성을 교훈하기 위해서 실제 사회의 문제가 즉시 전달되어야 한다는 것을 강조한 통로가 설치된 뫼비우스 띠를 STEM교육의 심벌로 도입 및 설정한다. STEM Education in the US and Korean STEAM are reviewed. The present STEM education focuses on K-12 and it does not concern STEM education in university. In this paper, we define a STEM education that can be made available in university and we establish a way of teaching and learning differential equations based on the STEM education. The class provides students with a chance to explore the capstone design projects that are developed by seniors and do hands-on activities. We introduce and set a Mobius strip with an instant delivery pathway to solve real problems as a symbol of STEM education.
하준홍(Ha, Jun-Hong),손수덕(Shon, Su-Deok),이승재(Lee, Seung-Jae) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.7
In this study, the dynamic unstable phenomenon and critical load variation of the spatial truss under the beating-wave load were researched. For this purpose, a non-linear governing equation of a shallow spatial truss was derived. In addition, a dynamic analysis and a characteristic analysis of the buckling phenomenon were conducted using the numerical method. The analysis model was selected considering the number of free nodes and the rise-span ratio, and the response to the periodic parameter that determines the period of the beating function was analyzed. To compare the results, a analysis for the step load and sinusoidal—wave load were also conducted. Resonance was observed in the analysis results for both the sinusoidal-wave load and the beating-wave load. The patterns of critical load level were similar in the area lower than the natural frequency, but they were different in the area above it. Furthermore, the critical level of the beating-wave load changed more sensitively than the sinusoidal-wave load did and was much lower than the step load.
실천공학 교수법 : 함수의 그래프를 이용한 형상의 윤곽 그리기
하준홍 ( Jun Hong Ha ) 한국실천공학교육학회 2010 실천공학교육논문지 Vol.2 No.2
함수와 그 그래프는 수학교육에서 매우 중요한 개념이다. 그러나 함수의 개념에 대한 이해 없이 학습을 하거나 또는 함수에 대한 흥미 없이 함수를 학습을 하는 학생들이 많이 있다. 본 연구에서는 함수와 그 그래프의 개념을 일상에서 볼 수 있는 다양한 형상 속에서 찾아보고, 형상과 함수의 그래프를 매칭하는 학습방법을 제시한다. 즉, 형상의 윤곽을 함수의 그래프로 생각하고, 그 그래프를 생성하는 함수를 추정하여 그래픽 기능이 내장된 계산기의 스크린에 함수의 그래프를 그리는 학습방법을 제시한다. The functions and their graphs are very important parts in mathematical educations. But there seems be a lot of students studying the functions and their graphs without grasping the meaning of them and without interest with them. We present a learning method of how to match functions and their graphs with outlines of various shapes. That is, outlines of the shapes are assumed to be the graphs of the functions and the graphs will be plotted on the screen of a computer with help of the computer algebra system.
실천공학교육 관련 : Pseudo-STEM에 기초한 미분방정식 교육
하준홍 ( Jun Hong Ha ),심재동 ( Jae Dong Shim ) 한국실천공학교육학회 2013 실천공학교육논문지 Vol.5 No.2
본 연구에서는 학생중심의 수학 및 과학 교육법으로 화제가 되고 있는 STEM교육의 유래와 STEM 교육을 대학교육에 부분적으로 적용하고 있는 Hands-on교육과 일본대학의 수리공교육의 사례를 조사한다. STEM교육은 학생들이 기술과 공학의 문제에서 수학의 필요성을 자각하도록 하고, 더 나아가 수학교과에 대한 수동적 학습태도를 능동적으로 바꾸는데 적합한 방법으로 부상되고 있지만, S(과학), T(기술), E(공학), M(수학)의 물리적 융합이 아닌 화학적 융합으로써 현행 대학 교과과정에 바로 적용하기에는 다소 무리한 측면이 있다. 따라서 실제 프로젝트에서 고려되어야 하는 T와 E를 졸업작품에서 스스로 찾도록 하고, 이 자발적인 발견을 수학교과목과 연계하는 Pseudo-STEM교육법을 제안한다. In this paper we investigate the history of the education based on STEM which is one of the topics of teaching method of Mathematics and Science oriented to the student, Hand-on education be applying partly to college education and the case of the education of the subject “Mathematics and Science for Engineering” of Japan`s college. The educational method based on STEM make the student to recognize by themselves the necessity of the mathematics in the study of the technological and engineering problem, and furthermore draw a conclusion which is the proper method to change from passive to positive the study attitude for the mathematics. But it is more or less unreasonable to apply directly to college education with not physical fusion but chemical fusion of S (science), T (technology), E (engineering) and M (mathematics). Therefore we make themselves to find T and E considered at graduation works. We propose Pseudo-STEM teaching method linking this recognition obtained through self-activity to the mathematics subject.
직교화 기법을 이용한 앙상블 경험적 모드 분해법의 고유 모드 함수와 모드 직교성
손수덕,하준홍,비자야 P. 포크렐,이승재,Shon, Sudeok,Ha, Junhong,Pokhrel, Bijaya P.,Lee, Seungjae 한국공간구조학회 2019 한국공간구조학회지 Vol.19 No.2
In this paper, the characteristic of intrinsic mode function(IMF) and its orthogonalization of ensemble empirical mode decomposition(EEMD), which is often used in the analysis of the non-linear or non-stationary signal, has been studied. In the decomposition process, the orthogonal IMF of EEMD was obtained by applying the Gram-Schmidt(G-S) orthogonalization method, and was compared with the IMF of orthogonal EMD(OEMD). Two signals for comparison analysis are adopted as the analytical test function and El Centro seismic wave. These target signals were compared by calculating the index of orthogonality(IO) and the spectral energy of the IMF. As a result of the analysis, an IMF with a high IO was obtained by GSO method, and the orthogonal EEMD using white noise was decomposed into orthogonal IMF with energy closer to the original signal than conventional OEMD.
손수덕,하준홍,이승재,Shon, Sudeok,Ha, Junhong,Lee, Seungjae 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.4
This study aims to develop a form-finding algorithm for a single-layered pneumatic membrane. The initial shape of this pneumatic membrane, which is an air-supported type pneumatic membrane, is to find a state in which a given initial tension and internal pneumatic pressure are in equilibrium. The algorithm developed to satisfy these conditions is that a nonlinear optimization problem based on the force method considering the deformed shape is formulated, and, it's able to find the shape by iteratively repeating the process of obtaining a solution of the governing equations. An computational technique based on the Gauss-Newton method was used as a method for obtaining solutions of nonlinear equations. In order to verify the validity of the proposed form-finding algorithm, a single-curvature pneumatic membrane example and a double-curvature air pneumatic membrane example were adopted, respectively. In the results of these examples, it was possible to well observe the step-by-step convergence process of the shape of the pneumatic membrane, and it was also possible to confirm the change in shape according to the air pressure. In addition, the calculation results of the shape and internal force after deformation due to initial tension, air pressure, and self-weight were obtained.