• 대한조선학회논문집
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• 제44권2호
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• pp.189-197
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• 2007

In this paper a study on the construction of a solar boat prototype is presented. Basic components of solar boats and the construction of a simple solar boat prototype by undergraduate students are described. Main purposes of this study are to examine the feasibility of developing commercial solar boats and to evaluate the effect of solar boat construction on the education of students. A low-cost solar boat prototype is constructed by assembling parts available in the market or laboratory. From the prototype construction experience, students obtained basic knowledge on the design and construction of commercial or racing solar boats. In addition, it is shown that the construction of a solar boat can be au effective educational program to expose students to practical multidisciplinary study involving naval architecture, ocean engineering, mechanical engineering, electrical and electronics engineering.

• 전기학회논문지
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• 제60권8호
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• pp.1529-1536
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• 2011

Recently, worldwide government policy is pursuing saving energy and preservation. add to this, the solar cells are getting the spotlight nonpolluting energy source, using a variety of products for solar cell. in this paper, we'll make solar tracking system for suitable of dynamic boat. we knew that general boats are using fixed solar cell, it's first time to use tracking system of solar cells for boats so it is hard to application. To solve this problem in this paper we use to a magnetic compass and GPS for suitable solar tracking system of dynamic movement and to analyze fixed and tracking solar system. frist. solar tracking device is designed two-axis control system. one-axis control system is taken a magnetic compass for making efficiency defence solar tracking sensor, two-axis control system apply GPS latitude and longitude data for SPA(Solar position algorithm) so we know the azimuth and altitude. it analyze data value of accuracy comparison from result. so the proposed algorithm confirm to have validity.

• 대한조선학회논문집
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• 제44권6호
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• pp.635-646
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• 2007

Human Powered Vessel Festival (HPVF) hosted by the College of Engineering of Chungnam National University, the Society of Naval Architects of Korea and the Korea Ocean Research & Development Institute has been held annually in Daejon since 1999. Solar boat powered by solar energy appeared for the first time in 2006, and it is expected that more new teams will enter this competition in the coming years. In this paper it is described that design procedures and manufacture processes of the solar boat named EPISODE. Firstly, It is aimed to understand compositions of the electric system and their performance properties and to show the design procedures using commercial design packages line WAVIS, CATIA, HCAD etc. Through the trial test, we confirmed ship speed, maneuverability, durability and operation condition of the electric system and found some problems. We plans to make reported problems go away and install hydrofoils for more improved speed performance.

• 해양환경안전학회지
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• 제17권2호
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• pp.161-166
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• 2011

본 연구에서는 태양전지로 구동되는 전기추진 소형선박을 제안하여 선체의 설계 및 모형선 시험을 행하였다. 선체 모양은 배의 안정성 및 태양과의 수광면적을 고려하여 차타마란형으로 제작하였다. 계산에 의하면 설계 선박의 선속을 5 knots로 할 때 1.1마력으로 충분한 추력이 산출되었으나 실제의 선속은 태양에너지 등 기후조건에 의해 산출된 값보다 약간 낮았다.

• 대한공업교육학회지
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• 제33권2호
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• pp.154-169
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• 2008

이 연구의 목적은 초 중등학교 학생들에게 수송 기술에 대한 흥미 및 지식, 기능, 태도를 기르고 나아가 역사 인식을 제고할 수 있는 교수-학습 자료인 학습용 모형 거북선을 개발하는 것이다. 먼저 문헌 연구를 수행하고, 모형 거북선의 구조와 구동방법 살핀 후, 모형거북선을 만들었다. 이 연구를 통하여 얻은 주요 결과를 요약하면 다음과 같다. 첫째, 학생들이 직접 제작하고 실험함으로써 설계 능력, 제작 능력, 탐구 능력 및 기술적 소양을 함양할 수 있도록 모형 거북선을 개발하였다. 둘째, 구동에너지에 따라 자연에너지를 이용한 돛, 태양에너지를 이용한 태양전지, 기계적인 에너지를 이용한 링크장치 및 스크루를 활용한 학습용 모형 거북선을 개발하였다. 셋째, 수송 영역에서 선박에 대한 관심과 흥미를 유발할 수 있도록 물 위에서 무선 조작으로 작동하는 모형 거북선을 개발하였다. 넷째, 역사적으로 의미 있는 전통 문화 유산인 거북선을 초 중등학교 기술 교과에서 실험 실습 교수-학습 자료로 활용할 수 있도록 개발하였다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.383-383
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• 2009

Silicon is commercially prepared by the reaction of high-purity silica with wood, charcoal, and coal, in an electric arc furnace using carbon electrodes, so called the metallurgical refining process, which produces ~98% pure Si (MG-Si). This can be further purified to solar grade silicon (SoG-Si) by various techniques. The most problematic impurity elements are B and P because of their high segregation coefficients. In this study, we explored the possibility of the using Cat-CVD for Si purification. The existing hot-wire CVD was modified to accommodate the catalyzer and the heating source. Mo boat (1.5 cm ${\times}$ 1 cm ${\times}$ 0.2 cm) was used as a heating source. Commercially available Si was purchased from Nilaco corporation (~99% pure). This powder was kept in the Mo-boat and heated to the purification temperature. In addition to the purification by cat-CVD technique, other methods such as thermal CVD, plasma enhanced CVD, vacuum annealing was also tried. It is found that the impurities are reduced to a great extent when treated with cat-CVD method.

• Journal of Advanced Marine Engineering and Technology
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• 제40권3호
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• pp.240-248
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• 2016

본 기술개발의 목적은 선박제조에 적용되는 태양광 발전시스템 및 풍력 Sail 돛 제어장치 설비를 이용하여 친환경 레져보트인 '풍력 Sail 돛 제어장치를 이용한 태양광 레져보트' 시제품을 제작 및 개발하는데 주안점이 있으며, 이 과정에서 제작된 시제품에 대한 성능평가를 수행하여 제반 평가항목에 대한 정량적 수치 및 개발 목표치를 확보하고자 함에 있다. 특히, 평가항목 중 중요 항목에 해당되는 Sail Up/Down System 및 Mast Turning System과 관련하여 최적의 풍향 및 풍속을 적용할 수 있는 돛 제어장치의 특성(시간, 각도 등)을 평가하는데 신중한 검토를 하였으며, 기타 평가항목 중 주요 항목에 해당하는 풍향 감지 정도(%), 순간 충전 최대 전력(W) 및 최대 운항 시간(hr) 등에 대해서도 최적의 정량적 수치를 획득하는데 그 중요성을 두었다.

• 한국해양공학회지
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• 제32권6호
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• pp.518-526
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• 2018

As a new technical approach, this paper introduces a method for improving an electrically propelled outboard motor in consideration of the driving system applied to an electric-propulsion boat with solar cell energy. The most efficient model for a drive shaft, propeller shaft, and bevel gear was suggested and examined with respect to the results of test operation in prototype mode. Furthermore, this research included a performance evaluation of the manufactured prototype to acquire the purposed quantity value and the development items. After manufacturing the desired prototype of an electrically propelled outboard motor, the maximum sail time, thrust force, noise, and weight were evaluated in a performance test. An additional test in relation to the maximum sail speed (knots) of the completed prototype was conducted using a sea trial evaluation to acquire the optimum quantity.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.68-73
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• 1998

This paper presents a novel prototype of active voltage clamped quasi-resonant ZVS-PWM forward DC-DC converter designed for specific low voltage high current application. We establish the soft-switching forward converter with a high frequency isolated link which can efficient operate over wide load ranges under conditions of zero voltage soft-switching and active voltage clamped switching. In addition, we evaluate connection of the soft-switching forward converter with large capacitor which capacitance is over 100[F].

• 수산해양기술연구
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• 제50권4호
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• pp.487-494
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• 2014

This study describes the result on PV system for evaluating the performance of small fishing boats. Photovoltaic system with 200 watts power generation facilities on the 3-ton fishing boat was carried. Load test was performed on the condition that the work lamps lit during night operations. As a result the performance can be used for more than two hours at 60 watt work lamps. The load test was performed on the condition that fishing vessels are on the cruising condition at sea. The solar power systems have been investigated as a power generation efficiency of about 36.55%. Additional tests show that the power generation efficiency is difficult to expect a maximum of 50% or more. Fuel consumption of fishing boats by installing a solar power system is reduced. Also the PV system is useful for the verification of their availability for fishing vessels as well as the satisfaction of the fishermen. The results for the durability of the photovoltaic device is acceptable, including a solar panel, controller and the performance exhibited no breakage in the harsh marine environment or failure so far. The installed PV system was confirmed that the durability with at least 2 years.