Recently, the outboard engine system of internal combustion engine is widely used in the field of small ship propulsion. However, the internal combustion engine has serious problems of energy depletion and environmental problems, so electric propulsion methods are being studied. In this paper, we have developed important motors and controllers of electric propulsion system for small marine outboard motors. The motor design was performed through the motor characteristics analysis method, and the 30Kw system was developed through the BEMF processing circuit and the power conversion circuit by the embedded microprocessor. This study was carried out through government supported projects and achieved quantitative targets through accredited institutions.

Domestic fishing villages' net profit has consistently dropped down in recently, and currently it is down to 16.4%.This paper develop and increase fishing profit as this project will decrease 20% of the operation cost and eventually vitalize the fishing villages' economy. Especially, it could be an alternative solution to the constant requests of WTO (World Trade Organization) and UN ECOSOC (UN Economic and Social Council) to stop cross subsidization of marine products. IMO (International Maritime Organization) is concerned about air pollution caused by carbon dioxide production, and it strongly suggests on decreasing carbon dioxide discharge level. This paper will help protect ocean ecology as it will not only decrease various types of oil usage but also promote alternative technology solution. Also Increase business' profit by selling ocean and other related business parts and factors. Low speed electric car applies high performance level of motor and motor control devices. Among those, about 20% is the original cost of motor and motor control devices. Therefor entering low speed electric car market, parts sales and sales will increase.

An acoustic and trawl pilot survey using a small vessel was conducted in Jinhae bay of the South Sea of South Korea on April 13~14, May 11~13 and June 8~10, 2015. During the survey, acoustic data was collected and bottom trawls were conducted at the same time. First, various noises were eliminated by using the Park method based on the Wang method(Wang et al., 2015; Park et al., 2015), the species compositions and catch rate from each bottom trawl were observed, and spatial distribution of fishery resources in the water column and their nautical area scattering coefficient (NASC) were investigated through acoustic data. During the entire survey period, 12 orders, 33 families and 41 species were caught. The most caught species in April, May and June were Okamejei kenojei, Zoarces gilli and Pholis nebulosa, respectively. Fish schools were observed near the line of net mouth height in April. Numerous weak scatters were presented on the echograms in May and June. Many fish schools appeared in between the water surface and 20 m deep in May. The NASC value from entire water columns was the lowest in April (35.9 m2/n･mile2) and highest in June (1541.3 m2/n･mile2).

본 연구에서는 단거리 영역 내에서 대상물표의 정확한 위치를 파악하여 물표와의 충돌을 방지하기 위한 시스템을 개발하였다. 이를 위해 먼저 물표를 속도 모델과 가속도 모델로 표현하여 초기위치로부터의 움직임을 프로세스 잡음과 측정 잡음이 있는 상태에서 위치, 속도 및 가속도를 추정하였다. 추정기법으로는 칼만필터를 적용하였고 시뮬레이션을 통해 제안기법의 유용성을 확인하였다. 다음으로는 레이저센서를 적용하여 이동하는 물표와의 거리를 계측할 수 있는 시스템을 제작하여 물표의 이동 정보를 검출하였다. 이동 물표를 대상으로 속도 모델과 가속도 모델을 적용하여 실험을 수행하였고, 각각의 실험을 통해 불연속적인 측정데이터가 필터링을 통해 매끄럽고 연속적인 측정값으로 얻어지는 것을 확인하였다. 또한 물표 데이터의 계측과 디스플레이를 위한 UI를 구축하였으며, 물표가 일정거리 영역이내에 접근했을 경우 시각, 청각적인 경보를 울릴 수 있는 기능을 부가하였다. 본 연구결과를 통해 저가의 장비로 물표 위치의 추정 성능이 뛰어난 시스템을 구축할 수 있었다.

In recent years, researchers have put a considerable effort to decrease the emission of harmful gaseous pollutants to the atmosphere. In order to remove simultaneously SO₂ and NOx from the flue gas of small and medium-sized ship, we designed minimal wet scrubber inside a compact multistage modular system. In this study we proceed experiment of elemental technology at each stage of the scrubber. The each stage is oxidation of NO which is the main component of NOx, and removal of SO₂, respectively. NaClO₂ was used to oxidize NO gas, and NaOH was used to remove SO₂gas. The maximum NO conversion efficiency and the SO₂ removal ficiency are both indicate 100%.

해양유류오염사고가 발생한 경우에 필요한 모든 방제자원을 사전에 확보하고 사고에 대응하는 것이 가장 효과적이지만 현실적으로는 한계가 있는 실정이다. 그러므로 대규모 유류오염사고에 대비하여 유류오염으로 피해를 입게 되는 오염지역의 어선을 활용하는 방안이 중요한 대안이 될 수 있다. 미국 등 선진국에서도 지역 어선을 이용한 임시방제정 프로그램이 개발되어 운영되고 있는 사례를 찾아볼 수 있다. 본 연구는 국내 소형어선에 적합한 기름방제용 스위핑 암 시스템을 검토하였다. 모델로 선정된 소형 선박은 연안유자망어선 및 연안복합어선으로 2.5~3.5톤, 길이 8~9 m, 폭 2.5~2.8 m, 마력 200~250 HP, 선질 FRP인 어선이다. 개발된 장치는 모델 선박에 간편하게 장착할 수 있고 이동이 가능한 구조로 설계되었다. 조립 및 분해를 쉽게 하기위해 각 부품의 무게를 10 kg 이하로 구성함으로써 현장 실용성을 높였다.