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A study on design and modeling of a Wave Energy Converter
윤종일(Yoon, JongIl),안경관(Ahn, KyongKwan),딩광쪙(Dinh, Quang Truong),황후티엔(Hoang, Huu Tien) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Motions in nature, for example ocean wave, has been playing a significant role for generating electricity production in our modern life. This paper presents an innovative approach for electric power conversion of the vast ocean wave energy. Here, a floating-buoy wave energy converter (WEC) using hydrostatic transmission (HST), which is shortened as HSTWEC, is proposed and designed to enhance the wave energy harvesting task during all wave fluctuations. In this HSTWEC structure, the power take-off system (PTO) is a combination of the designed HST circuit and an electric generator to convert mechanical energy generated by ocean wave into electrical energy. Several design concepts of the HSTWEC have been considered in this study for an adequate investigation. Modeling and simulations using MATLAB/Simulink and AMESim are then carried out to evaluate these design concepts to find out the best solution. In addition, an adaptive controller is designed for improving the HSTWEC performance. The effectiveness of the proposed HSTWEC control system is finally proved by numerical simulations.
A New Design of Wave Energy Generator Using Hydrostatic Transmission
안경관(Ahn, Kyoungkwan),딩광졍(Dinh, Quangtruong),윤종일(Yoon, Jongil) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
An innovative design of a floating-buoy wave energy converter (WEC) using hydrostatic transmission (HST), named HSTWEC, is presented in this paper. The system is designed to convert ocean wave fluctuation into electricity by using the HST circuit and an electric generator. Based on the floating-buoy concept, the wave forces the sub-buoy to move up and down. Consequently, the electric power can be obtained from the generator in both the moving directions of the sub-buoy through the HST circuit as shown in Fig. 1. In order to investigate the HSTWEC operations, a mathematical model of the system is indispensible. In addition, the method to control the HSTWEC, including: pump displacement control, tension adjustment control and ballast weight control, is also discussed in this paper. Finally, the design concept as well as simulation results indicated that this HSTWEC design is an effective solution and possible to fabricate for wave energy generation.
조우근(Wookeun Jo),안경관(Kyoungkwan Ahn),윤종일(Jongil Yoon),김동우(Dongwoo Kim),임구(Goo Lim),박재현(Jaehyun Park) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
This paper is a study on the path-tracking of electronic wheelchair for welfare vehicle and on autonomous driving that vehicles seek for their own position following car. Normal welfare vehicles need an assistant, while those in this paper are designed for the disabled themselves to drive them. So a notion of autonomous driving of electronic wheel chairs and of moving robots is needed. We suggest fuzzy controller in order to control some of all the path planning of electronic wheelchair which is applied to welfare vehicles designed for self driving. And we com pare a capability of PID controller with that of fuzzy controller.
텍스트 마이닝 기반 국내 · 외 건설기계분야 연구트렌드 분석
윤봄(Bom Yun),배준수(Joonsoo Bae),윤종일(JongIll Yoon) 한국전자거래학회 2024 한국전자거래학회지 Vol.29 No.2
본 연구는 국내 · 외 건설기계 분야 연구 동향을 분석하기 위한 것으로, 국가연구개발사업으로 선정된 과제와 영문으로 게재된 해외 논문 자료의 제목 데이터를 활용하였다. 제목에는 핵심키워드가 포함되어 있다고 가정하였고 연구 동향을 분석하기 위해 텍스트 마이닝을 활용하였다. 데이터는 국가과학기술지식정보서비스(NTIS)와 Web of Science를 활용하여 2014년부터 2022년까지 9년간 자료를 수집하였다. 이를 바탕으로 명사를 추출하여 키워드 빈도 분석과 토픽 모델링 분석을 실시하였다. 시간에 따른 변화를 관찰하기 위해 3년 간격으로 시간 구간을 설정하였고 ‘장비’, ‘스마트’, ‘친환경’ 그룹으로 키워드를 분류하였다. 연구 결과 국내 · 외 모두 스마트 관련 분야를 중심으로 연구개발을 수행하는 것으로 나타났다. 국내에서는 주로 장비 모니터링 시스템, 안전성 향상, 자율작업 관련 연구개발에 투자하고 있다. 반면에 해외에서는 건설관리와 무인 건설기계에 관한 연구가 주로 이루어지고 있는 것으로 확인되었다. 본 연구는 빅데이터 분석 기법을 활용하여 객관적인 연구 동향을 분석했다는 점에서 의의가 있다. 향후 건설기계 분야의 연구기획 및 전략 수립 등에 도움이 될 것으로 기대된다. To analyze the research trends in the field of construction machinery both domestically and internationally, data on projects selected for national research and development in Korea and titles of papers published in English were collected. It was assumed that the titles contained key keywords, and text mining was utilized to prove this. Data from the National Science and Technology Information Service (NTIS) and the Web of Science were collected over a period of nine years, from 2014 to 2022. Based on this, noun extraction was performed for keyword frequency analysis and topic modeling analysis. To observe changes over time, the period was divided into three-year intervals. For efficient analysis of research trends, the extracted keywords were categorized into groups such as ‘equipment’, ‘smart’, and ‘eco-friendly’. The study found that both domestic and international research and development are focused on smart-related areas. In Korea, investments are primarily made in equipment monitoring systems, safety improvements, and autonomous operation research and development. In contrast, international research is predominantly conducted on construction management and unmanned construction machinery. This study is significant in that it utilizes big data analysis techniques to analyze objective research trends. It is expected to be useful for future research and development planning and strategy formulation in the domain of construction equipment.