• Journal of Aerospace System Engineering
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• v.14 no.5
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• pp.58-65
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• 2020

In this paper, the combat effectiveness of ship guidance rockets to counter the threat of multiple USV(Unmanned Surface Vehicle) was analyzed in three cases. The probability of sinking a number of USVs approaching by distance was compared using various weapon systems and guided rocket systems installed on the naval vessels. As a result of the analysis, it was found that the combat effectiveness of the guided rocket was improved compared to the close defense system of the anti-ship missile installed on the naval vessels.

• New & Renewable Energy
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• v.9 no.1
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• pp.60-68
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• 2013

In recent years, green house effect related natural disasters occur throughout the world. Carbon dioxide, mainly comes from the fossil fuel burning, is suspected to be the cause of green house effect. To reduce the emission of carbon dioxide, we need to find alternative energy resources such as photovoltaic energy. In this paper, the basic characteristics of wind force coefficient on a PV panel installed on the floating type PV energy generation system are investigated though the two-dimensional wind tunnel tests. Test variables included the angle of PV panel, direction of wind, number of rows of PV panel and attached or not attached frame. Based on the results obtained through the wind tunnel tests, it was found that the wind force coefficient can be used as a preliminary data in the design of the structure.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.7
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• pp.923-928
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• 2014

Communication underwater is severely limited when compared to communications in air because water is essentially opaque to electromagnetic radiation except in visible range. Acoustic systems are capable of long range communication, but offer limited data rates and significant latency due to the speed of sound in water. On the other hand, optical wireless communication has been proposed as one of the best alternatives to meet the requirements of the underwater observation and subsea monitoring systems. It will help In this study, we are developing an underwater optical communication system that integrates with a depot ship floating on the water. An interface between LED lighting communication system and Bluetooth module is presented to support the underwater-to-air communications. Error free image and text transmission at 3 m of water were achieved at bit rates of 230.4 kbps. This development effort will enhance infrastructure to efficiently interconnect between underwater wireless systems and command ship networks for underwater monitoring.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.93-94
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• 2013

카이트 보딩은 윈드서핑, 요트 등과 같이 바람을 이용한 수상레저기구이며 국내에서는 소수의 동호인을 중심으로 매니아 층을 형성하고 있다. 최근 해양레저장비 분야에서도 친환경기술과의 접목이 진행되고 있으며, 특히 해외에서는 대형선박의 연료비 절감 및 환경오염 인자 저감을 위한 선박 추진용 카이트 시스템이 개발되어 사용 중에 있다. 본 연구에서는 카이트 추진형 레저보트를 대상으로 풍속, 풍향, 카이트의 위치 등에 따라 자동제어 및 운항 가능한 시스템을 제안하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.200-202
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• 2011

신축되어 운영중인 플로팅 호텔과 현재 계획중인 플로팅 호텔을 대상으로 건축적 특징과 경향을 파악하여 건축계획시 참고자료를 제시하고자 하였다. 건축적 특징으로는 이동성에 따른 장기간 사용, 환경에 대한 배려, 재생 에너지 사용 등이 있고, 건축적 경향으로는 수상에 떠있는 장점의 활용, 개발된 신재료 도입, 독립적 생명지원시스템, 신속한 공사를 위한 조립식 도입, 재생에너지 시스템 도입 등이 있다.

• Electrical & Electronic Materials
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• v.6 no.4
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• pp.361-365
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• 1993

플라즈마화상 계측 시스템에 있어서 단층화상의 화질이 떨어지는 문제점 중의 하나로서 시준기특성이 있다. 이것은 시준기가 길이를 가진 형태이기 때문에 생기는 것으로써 화상에서는 천이변형의 왜곡으로 나타난다. 본 논문에서 보정법으로 측정데이타를 공간주파수상에서 천이불변형태로 디콘볼루션하는 방법을 제시하고 시준기의 각도를 파라메타로 해서 플라즈마 계측에 의한 실제의 데이타에 그 보정법의 유효성을 검증하였다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1995.10b
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• pp.258-263
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• 1995

본 논문은 일반화된 다중 수상돌기 적 (GMDP : Generalized Multi Dendrite Product) 유닛트 신경망을 이용한 PID 적응 위치제어기를 구성하여 직류 서어보 전동기의 위치제어를 실시간 처리 하였다. 제안한 제어기를 위치제어에 적용시켜 실험한 결과 기존의 MLP 신경망 제어기를 이용한 것 보다도 샘플시간을 줄일 수 있다는 장점으로 정밀한 제어 가 가능하다는 것을 확인할 수 있었다. 학습규칙은 기존의 역전파 학습방법이 GMDP 신경 회로망에 적용되었다.

• KOREAN POULTRY JOURNAL
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• v.52 no.2
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• pp.96-99
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• 2020

1970년대 이후 경제성장과 함께 식품산업이 빠르게 성장하면서 축산업이 본격적으로 시작되었다. 동시에 국내 양계산업은 전문화·자동화 기술 도입, 품질과 사양관리 개선 등으로 생산성이 향상되면서 축산 선진화 대열에 들어서기까지 업계 관계자들의 참여와 노력이 상당했다. 이번호에는 해외의 우수한 양계기술과 제품을 들여와 국내 양계산업을 한층 끌어올리는데 선두적인 역할을 해온 과학시스템(주) 박만후 대표를 만났다. 박만후 대표는 산업 발전을 위해 노력한 공을 인정받아 지난해 12월 4일 '월간양계 창간 50주년 기념행사'에서 장관상을 수상하는 영예를 안기도 했다. 그간 활동을 소개한다.

• Korean Journal of Ecology and Environment
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• v.52 no.4
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• pp.293-305
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• 2019

In this study we investigated the effect of a floating photovoltaic (FPV) system in Cheongpung Lake on water quality. The FPV with a tilt angle of 33° covered ca. 0.04% of surface area (97 ㎢) of Chungju Lake. The water qualities of the whole lake before and after installation of FPV were first compared. DO, BOD, TOC, and Chl-a of the whole lake were increased, while conductivity decreased after installation period at the significance level of 0.05. This change was probably due to the increased influx of nutrients by 40% resulting from increased precipitation during the same period. We also measured water quality parameters on May and Nov. 2017 at the FPV center (FPVC) and nearby control sites, and compared water quality. The result showed that the FPVC and nearby sites were not significantly different (p>0.05), demonstrating that the FPV does not cause a decline of water quality. The water temperature, light intensity, and phytoplankton community were also measured. The water temperature was not different between the sites, while the light intensity decreased to 27~50%. Despite reduced light intensity at FPVC, the phytoplankton standing crops and the number of species were not significantly different (p>0.05). However, in the early November samples, standing crops was significantly higher in FPVC than control with periphytic diatoms belonging to Aulacoseira genus being dominant. This may be due to the temporal water body behavior or local retention of current by FPV system. This study may provide a measure of future installation of a FPV system.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.6
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• pp.831-836
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• 2010

In real system application, the path planning and following system for the coordinated control of heterogeneous marine robots based on the underwater acoustic communication has the following problems: surface and underwater robots have different maneuvering properties, an underwater robot requires more effective operating, it has a limited communication range because of the transmission loss (TL) of acoustic wave, it has a communication error because of the Doppler distortion of acoustic wave, and further, it requires an easy design procedure in terms of its structures and parameters. To solve these problems, an intelligent path planning algorithm using the evolution strategy (ES) and the fuzzy logic controller (FLC) based on system modeling, is proposed. To verify the performance of the proposed algorithm, the path planning and following of an underwater robot is performed according to the maneuvering of a surface robot. Simulation results show that the proposed algorithm effectively solves the problems.