고출력 엔진에서 연소실 내의 노킹음에 의한 공진현상 분석

이두곤,장석형,이종호,박경석,전계석,Lee, Du-Gon,Jang, Seok-Hyung,Yi, Chong-Ho,Park, Kyung-Suk,Jun, Kye-Suk 한국음향학회 1992 韓國音響學會誌 Vol.11 No.4

고출력 가솔린 엔진에서 연소실 내의 급격한 압력 변화에 의해 노킹음이 발생되는데 이로 인하여 공진현상이 일어난다. 일반적으로 이러한 공진음은 5KHz 이상에서 발생되고 이 현상에 대한 고출력 가솔린 엔진의 노킹제어 시스템을 설계하는데 매우 중요하다. 본 논문에서는 고출력으로 설계된 엔진에서 사용되는 노킹 제어시스템을 설게하기 위해 연소실에서 발생되는 노킹현상을 이론적으로 분석하여 노킹음의 모드별 공진 주파수를 예측하였다. 또한 스쿠프 알파 엔진과 독일 보슈사의 비공진형 노킹센서를 시용하여 실험을 수행하였고, 그 결과 이론과 실험이 잘 일치함을 알 수 있었다. Cavity resonances are caused by combustion such as the rapid of pressure rise that occurs from knock in high power gasoline engines. These resonances generally occur at frequencies greater than 5KHz. Analysis of these resonances is important for knock control system design in high power gasoline engines. In this paper, in order to design knock control system for the high power gasoline engine, knock phenomena that occur in chamber were analized theoretically and resonance frequencies of knock signals were predicted. Also, experiments were performed using Soupe x-engine and non-resonance type knock sensor of Bosch co. in Germany. In the result, good agreement was obtained between theoretical prediction and experimental observation.

1998년도 추계학술대회를 마치고

이두곤(Du Gon Lee) 한국해양환경·에너지학회 1999 한국해양환경·에너지학회지 Vol.2 No.1

PCB로 오염된 연안 퇴적물 입자의 침강 및 연직확산 모델연구

이두곤(Du Gon Lee) 한국해양환경·에너지학회 1998 한국해양환경·에너지학회지 Vol.1 No.1

Settling Column의 입자분포 측정치를 이용한 연안 퇴적물 입자의 연직이동 모델연구

이두곤(Du Gon Lee) 한국해양환경·에너지학회 1999 한국해양환경·에너지학회지 Vol.2 No.1

소하천 물 환경교육 프로그램의 적용 및 평가

김정화(Jeong Hwa Kim),이두곤(Du Gon Lee) 한국환경교육학회 2011 環境 敎育 Vol.24 No.2

The purpose of this research is to apply and evaluate the Water Environmental Education Program Using Streams(WEES) to pre-service teachers. WEES is developed to help the teachers increase their professionalism of incorporating a local environment into their inquiry teaching. The subjects of the study include the juniors of the Environmental Education Major at the Korea National University of Education. For the purpose this study, educational criticism about WEES was performed. The subject students were observed throughout the program application, after which a survey and in-depth interviews were carried out. As a result, the implementation elements and content organization of the WEES were found to be implemented in the application process in a satisfying level. In the content organization of the program, the preliminary preparation, visual assessment, and inquiry planning were organically connected with each other for inquiry purposes. The Intrinsic value of environmental education was also demonstrated in the implementation elements and content organization. Overall, the stream turned out to have a great value of environmental education and a potential as a place and material for environmental education. The great significance of the study can be found in that WEES took into account not only the characteristics of the ENVISION based on the watershed concept, but also the situations of Korea’s environmental education and exploration from the perspective of environmental studies.

환경교육적 탐구를 통한 유역 중심의 물 환경교육 교재화 연구

허진숙(Jin Sook Heo),이두곤(Du Gon Lee) 한국환경교육학회 2008 環境 敎育 Vol.21 No.4

The purpose of this study is to realize the teaching material, which develops the Model of Watershed Water Environment Education(EE) Textbook, by seeking for a method of the Inquiry with the Perspective of EE and by questing for the contents of watershed water environment necessary for Water EE with the Perspective of EE. First, the value of watershed EE was reilluminated through the literature analysis on the watershed. And ’Inquiry with the Perspective of EE’ methodology was newly presented that quests for the contents necessary and proper for EE from the viewpoint of EE. Also, with suggesting it as concept and methodology of ’Inquiry with the Perspective of Watershed EE’ by considering the value of EE in Water EE, it presented the content approach direction in the inquiry and the contents of the specific inquiry. Second, through the Inquiry with the Perspective of EE into water environment of the watershed Musim cheon (stream), which is a case region, it allowed the watershed water environment to be able to be synthetically understood. As for a sphere of the inquiry, 5 spheres were sought by taking into account a relation to a human being, as well as the water environment itself of the watershed Musim cheon (stream). Third, Based on the contents of the Inquiry with the Perspective of EE into the watershed Musim cheon (stream), ‘the Model of Watershed Water EE Textbook’ for middle-school students was developed. This model of textbook was selected largely four parts, and was organized with 10 learning objectives and 11 activities.

탐구중심 환경교육과 STEAM 교육의 융합적 교육 모형 제안

정옥영(Ok Young Jung),이두곤(Du Gon Lee) 한국환경교육학회 2015 環境 敎育 Vol.28 No.1

이 연구는 직지천 생태연못을 사례 지역으로 탐구중심 물환경교육과 STEAM 교육을 연계하여 ‘융합적(STEAM) 물환경 탐구모형’을 제안하였다. 이 제안된 환경교육 모형에서는 김천시 직지천 유역의 역사적, 지리적, 문화적 특성에 대해 통찰적 탐구를 하였다. 또한 디지털기기로 EC와 DO 등의 수질 측정을 통해 수질을 탐구하고, 부착조류의 역할을 탐구하는 과학적 탐구를 하였다. 또한 물가에서 적당한 놀이를 하였고, 수변 환경을 둘러보고, 디지털 카메라로 생물상이나 아름다운 자연환경 또는 공원의 조각품 등을 촬영하고, 학생들은 수변 사진을 보면서 떠오르는 생각이나 느낌을 디카시(詩)의 형태로 표현하는 문학적 감성적 표현 활동을 하였다. 이 연구는 융합인재교육(STEAM)과 탐구중심 환경교육(IBEE)를 결합의 가능성을 제시하였다. 이 모형은 통찰적 탐구, 과학적 탐구, 감성적 표현활동을 포함한 더 흥미 있고 쉽게 접근할 수 있는 환경교육을 의도하였다. 이 연구는 탐구중심 환경교육과 STEAM 교육의 접목으로 더 나은 환경교육을 할 수 있는 가능성을 탐색한 점에서 의의가 깊다. 또한 환경교육과 STEAM 교육을 이론적으로 고찰하여 그 연계 가능성을 제시하였다. In this study, a Convergent Educational Model of the Inquiry-Based Environmental Education (IBEE) and STEAM Education was proposed while taking Eco-pond in the Jikjicheon watershed as an example. The proposed EE model includes an insightful inquiry of historic, geographic and cultural characteristics of the Jikjicheon watershed in Gimcheon city. Water quality monitoring was also a part of the model, which was conducted scientific inquiry to measure water quality with using DO (dissolved oxygen) and EC (electrical conductivity) digital meters to inquire the water quality and the role of attached algae in there. Besides, proper games in the watersides were conducted and taking pictures of the watershed environment, organisms and sculptures with digital cameras while looking around the pond and activities for student’s literary expression such as making dicapoem (digital camera poem) expressing their feelings about the waterside scene pictures. This research suggests the possibility of using the Convergent Educational Model with the IBEE and STEAM Education. This model intends to be more interesting and easily accessible Environmental Education through insightful and scientific inquiry and creative emotional expression activities. This study is significant as it has tried Convergent Educational Model of Inquiry-Based Water Environmental Education and STEAM education (STEAM-IBEE) to suggest the possibility of a better Environmental Education. Furthermore, by the theoretical analysis, this study revealed the connecting possibility between Inquiry-Based Water Environmental Education and STEAM education.

초등 7차 교과서의 환경교육적 내용 분석 및 초등환경교육 체계화를 위한 학교 교육과정 개발 방안

심정은(Jung Eun Shim),이두곤(Du Gon Lee) 한국환경교육학회 2013 環境 敎育 Vol.26 No.2

The purpose of this study is to reorganize the dispersive contents of the elementary Environmental Education(EE) in subject matters from the perspective of the Environmental Studies for Environmental Education(ESEE) and to systematize the elementary EE through school-based curriculum by presenting how to develop the curriculum which is designed to practice elementary EE. In this research, we utilized the concept and the related theory of ESEE to analyze the contents of the elementary EE textbooks of all subjects of the 7th national curriculum of Korea, and presented a direction and model to implement in the school-based EE curriculums which can systemize and integrate the dispersive EE contents in elementary education. Using the five content areas of ESEE, this research evaluated the EE contents of elementary textbooks through the perspective of ESEE and presented a new organizing method of elementary EE curriculum to systemize and integrate the EE contents. This research showed that the ESEE has a potential to implement the systematic and integrative contents of EE in the school-based EE curriculum to solve the current problems of elementary EE under the national curriculum.

소하천 물 환경교육 프로그램을 위한 백천에 대한 환경학적 탐구

김정화(Jeong Hwa Kim),이두곤(Du Gon Lee) 한국환경교육학회 2010 環境 敎育 Vol.23 No.4

The Water Environmental Education Program Using Streams(WEES) is developed to help the teachers increase their professionalism of incorporating a local environment into their inquiry teaching. The purpose of this study is inquiry about the ‘Baig Cheon’ stream with the perspective of environmental studies for WEES. Through these studies, we tried to get the background information in ‘Baig Cheon’ and profound insights into application of WEES. The ‘Baig Cheon’ was examined from the perspective of environmental studies through literature study, field study, and water quality monitoring. The results revealed the characteristics of the ‘Baig Cheon’ that ran across a rural area in terms of the watershed boundaries, water systems, and water usage. The changes to the water quality items were observed according to the spatial distribution at the measuring points across the watershed for six months from March to August, 2007. The results indicate that the water quality of the ‘Baig Cheon’ could well be affected not only by the natural and environmental conditions such as the geological features, but also by the human activities including the land uses in the surrounding roads, rice fields and farms and the water supply and usage. The inquiry of the ‘Baig Cheon’ from the perspective of environmental studies will hopefully make the education and inquiry process of WEES more meaningful and in-depth and contribute to providing better environmental education that properly reflects the nature of inquiry from the perspective of environmental studies.

소하천 물 환경교육 프로그램 개발

김정화(Jeong Hwa Kim),이두곤(Du Gon Lee) 한국환경교육학회 2007 環境 敎育 Vol.20 No.4

The purpose of this research is to develop a water environmental education (EE) program using streams, based on the core ideas of ENVISION and materializing elements that were extracted in this research. This research realized the elements and presented a model of the water EE program using a local stream. First, this research developed a basic model of a water EE program using streams by extracting 10 materializing elements and realizing the elements in 4 stage-procedural model. The 10 materializing elements were 1. experiencing the process of inquiry, 2. inquiring local environments, 3. self-directing learning and mutual interaction with colleagues, 4. collecting real data and interpreting, 5. utilizing the ICT(information and communication technology), 6. inquiring with the view point of the 'Environmental Studies for EE', 7. inquiring with the watershed concept, 8. inquiring with the integrating and the holistic view point, 9. pursuing the macroscopic understanding about environment, and 10. connecting the real world phenomena with the environmental concepts and theories. This research materialized these 10 elements in 4 stage model, following the previous ENVISION research, which are 1. preparing stage visual assessment, 2. writing the report of the inquiry plan, 3. collecting the real data in the environment and performing the investigation, and 4. presenting the inquiry results. Second, with using this basic model, this research developed and presented a model of the specific water EE program using a case stream called 'Baig Cheon' stream, which is a local stream. This research is considered to have a considerable meaning in developing a EE program with ENVISION ideas for the watershed concept and inquiry with environmental science using local streams. The developed model can help the professional development of teachers and teacher education of water EE.