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金云經,金貞泰 弘益大學校 科學技術硏究所 2002 科學技術硏究論文集 Vol.13 No.-
Honeycomb structures possess high stiffness to mass ratio, and are widely used in applications, where light weight, high stiffness are required. In this paper, sound transmission characteristics of honeycomb structures are investigated. An aluminum specimen with the length, height, thickness of 740mm, 650mm, and 40mm respectively is considered. the main natural frequencies of the specimen are found to the 450Hz, 520Hz, 570Hz and 620Hz, as mentioned from frequency response functions. The 600Hz range represents the frequency region in which the radiation efficiency is at the maximum and coupled with a resonance, the transmission loss measured in the reverberation is greatly attenuated. For the frequency range in excess of 600Hz, the loss is found to obey the mass law, and compared with the steel plate with the equivalent mass, the transmission law is attenuated by about 3dB. It can be concluded that except for resonance region, the transmission loss obeys the mass law, and the transmission characteristics need to be required through proper damping.
2015 음악과 중학교 기본교육과정 교과서 제재곡 분석 및 특수학교 음악수업을 위한 연구
김운경 한국음악응용학회 2018 음악응용연구 Vol.10 No.-
본 연구는 음악과 중학교 기본교육과정 교과서 제재곡을 분석하고 2015 교육과정의 교육목표 에 맞는 교육방법을 제시하는데 목적이 있다. 이를 위해 먼저 교과서의 제재곡을 음악교과서 분 석도구에 따라 분석하고 음악교사가 핵심역량을 도달하기 위해 음악적 전문성 기준에 대한 방안 을 제시하고 이를 바탕으로 특수교사의 음악교수역량의 중요성을 제언하였다. 본 연구에서 분석 한 제재곡을 바탕으로 2015개정 교육과정의 목표를 도달하고 핵심역량을 반영하는 궁극적으로 특수학교의 음악교육이 질적으로 향상할 것이다. The purpose of this study is to analyze the music, the textbooks of middle school basic curriculum textbooks, and to suggest educational methods suitable to the educational goals of the 2015 curriculum. For this purpose, we analyzed the music of the textbook according to the analysis model of the music textbook, suggested the musical expertise standard to reach the core competence of the music teacher, and suggested the importance of the music teaching capacity of the special teacher based on this. Based on the analysis of this study, the goal of the 2015 revision curriculum will be achieved and the music education of special schools will be improved qualitatively to reflect core competencies. Therefore, the following suggestions were made. First, it is necessary to find ways to establish music education goals by using textbooks in each part of music activity area to meet middle school level. Second, this study deals with analyzing the contents of special middle schools. However, future studies should also analyze the teaching and learning methods of high school textbooks. Third, it is necessary to search for the use of textbook according to the type of disability. When planning activities in textbooks, students should be able to participate regardless of the degree and type of disability.
가상실험을 이용한 기체분자운동 수업에서 개념 변화와 가상실험에 대한 인식 연구
김운경,강성주 한국현장과학교육학회 2009 현장과학교육 Vol.3 No.2
In this study, the perception of a virtual laboratory and the understanding of the chemical concept about the kinetic theory of gases were analyzed when students learned the kinetic theory of gases through a virtual laboratory. The in-depth interview had been conducted to 19 students taking the general chemistry course. Students recognized the change of a speed and a kinetic energy after collision. Students mentioned the presence of intermolecular interaction, the volume of a molecule, the conservation of kinetic energy as a difference between virtual and real world. In addition, students could learn the new concepts because the virtual laboratory makes the abstract concept visible. 이 연구는 가상실험을 이용하여 기체분자운동론을 학습할 때 학생들이 알게 되는 화학 개념과 가상실험에 대한 인식을 알아보고자 하였다. 화학교육 전공 일반화학수강자 19명을 대상으로 인터뷰를 실시하였고 인터뷰 내용을 집중 분석하였다. 학생들은 분자간의 충돌에서의 속력 변화, 운동에너지 변화를 새롭게 인식하였다. 현실세계와 가상세계 입자의 차이점으로 입자 사이의 힘, 기체 분자의 부피, 운동에너지의 보존여부 등을 언급하였다. 또한, 학생들은 가상실험이 추상적인 내용을 가시화하여 학습하므로 새로운 개념을 습득할 수 있다고 하였다.
김운경,김정태,김관주,김석현 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.1
As a test specimen. an aluminum extruded panel with a dimension of 640 mm$\times$740 mm$\times$40mm is considered. This plate has 9 mm thickness if mass is concerned. Based on the FEM modeling in rigidity. the specimen turns out to be 32 mm and 12 mm thickness In isotropic steel plate. Also, the characteristics of transmission loss on the honeycomb structure have been examined experimentally with reverberation chamber. A honeycomb structure follows mass law in above 800 Hz. In order to improve the noise transmission effect in lower frequency, extra damping treatment is suggested. As a conclusion. the examined honeycomb structure Is designed to Improve the bending rigidity, not for the noise reduction.
김운경,김정태 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
In order to evaluate the sound transmission loss of a structure, a large reverberation room described by ISO is generally used. ISO test method is however for architectural structures, which is not properly implemented for small mechanical structures, such as rolling stocks. In this paper, evaluation procedure for railway vehicle structures has been proposed.
경량구조물의 차음성능 향상방안 : Honeycomb 구조의 적용사례
김운경(Kim Woon-Kyung),김정태(Kim Jeong-Tae),김석현(Kim Seock-Hyun) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Honeycomb structures have advantages in weight reduction with stiffness increment. As far as noise is concerned, however a light aluminum structure, instead of a steel frame, should have an equivalent mass density in order to maintain sound insulation performance. In this paper, an evaluation of a material effect on noise has been examined.
Li WenCheng,김운경(Woonkyung M. Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
We proposed a new methods for machine learning based on morphological theory in this paper. First, we analyzed the possibility of machine learning based on this method, then analyzed how to minimize errors based on this method.