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실천공학교육 관련 : Pseudo-STEM에 기초한 미분방정식 교육
하준홍 ( Jun Hong Ha ),심재동 ( Jae Dong Shim ) 한국실천공학교육학회 2013 실천공학교육논문지 Vol.5 No.2
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.
실천공학 교수법 : Maple을 활용한 미분방정식 학습
하준홍 ( Jun Hong Ha ),심재동 ( Jea Dong Shim ) 한국실천공학교육학회 2009 실천공학교육논문지 Vol.1 No.1
In the study of differential equation the most obstacle is that you have to spend lots of times and the plots of solutions are not easy by hand. If we do not solve these kinds of problem, it is difficult to achieve the goal of the object which is the understanding and the practical use of the differential equation. In this paper we explain what should be Maple`s usefulness in the method of removing these obstacles, and introduce the stepwise executing codes of Maple which is developed for student`s easy application.
실천공학 교수법 : 함수의 그래프를 이용한 형상의 윤곽 그리기
하준홍 ( Jun Hong Ha ) 한국실천공학교육학회 2010 실천공학교육논문지 Vol.2 No.2
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.
실천공학 교육 방법론 : STEM교육을 기반으로 한 미분방정식의 교육
하준홍 ( Jun Hong Ha ) 한국실천공학교육학회 2015 실천공학교육논문지 Vol.7 No.1
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.
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.
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.