• Title/Summary/Keyword: 발라

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A Study on the Ballast Control System for Offshore Plant (Offshore Plant용 발라스트 제어 시스템에 관한 연구)

  • Oh, Jin Seok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.12
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    • pp.2944-2951
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    • 2013
  • Recently, the offshore plant has been revived by rise in oil prices and energy consumption. Due to the external environmental impact, the ballast system is essential for an offshore plant. The ballast system for the existing offshore plant, consist of pump 6EA and Ballast tank 4EA, is performed by the tilt control. However, this system is vulnerable to a failure due to the fact that a lot of equipment needs to be installed within the system. In this paper, a new concept of ballast system and the control algorithm based on IT is proposed. Simulator has been created to test the proposed system and algorithm, and as a result, it has proven that it is controlled stably.

Electrochemical Disinfection for Ballast Water Treatment (발라스트수 처리를 위한 전기화학적 살균처리)

  • Seo, Won-Hak;Jeon, Sun-Ae;Kim, Ji-Hyun;Lee, Tae-Ho;Sang, Byoung-In
    • Journal of Korean Society of Environmental Engineers
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    • v.28 no.11
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    • pp.1162-1167
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    • 2006
  • The discharge of ballast water from the marine vessel without proper treatment causes the ecological disruption. Therefore, International Marine Organization(IMO) has the plan to force the proper treatment of ballast water before its discharge to open sea. To satisfy the IMO's criteria, several processes such as filtration, UV irradiation, and ozonation etc., were introduced. Since the disinfection of ballast water should be conducted within very short hydrolic retention time, electrochemical treatment can be a promissing process. The DSA(dimensional stable anode) electrode for the electrochemical treatment was prepared by thermal deposition method. The disinfection rate of microorganisms increased with the increasing current density and reaction time under low pH condition. The morphology of sterilized microorganisms was shown by SEM and Microscopy.

A study on a ballast optimization algorithm for onboard decision support system (선내탑재 의사결정지원 시스템을 위한 발라스트 최적화 알고리즘에 관한 연구)

  • Shin Sung-Chul
    • Journal of Navigation and Port Research
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    • v.29 no.10 s.106
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    • pp.865-870
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    • 2005
  • Because there are only a limited number of means of action that are available for the master to pursue in the event of flooding, onboard decision support system has been required. The majority of systems activated during a flooding emergency (such as watertight and semi-watertight doors, bulkhead valves, dewatering pumps etc.) almost exclusively aim to restore a sufficiently high level of subdivision to prevent flooding from spreading through the ship. Even though assuming the flooding scenario is not catastrophic, the use of ballast tanks can be an additional and very effective tool to ensure both prevention of flooding spreading and also improve ship stability. This paper describes an optimization algorithm devised to choose the set of ballast tanks that should be filled in order to achieve an optimal response to a flooding accident.

A study on a ballast optimization algorithm for onboard decision support system (선내탑재 의사결정지원 시스템을 위한 발라스트 최적화 알고리즘에 관한 연구)

  • Shin Sung-Chul
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2005.10a
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    • pp.75-80
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    • 2005
  • Because there are only a limited number of means of action that are available for the master to pursue in the event of flooding, onboard decision support system has been required The majority of systems activated during a flooding emergency (such as watertight and semi-watertight doors, bulkhead valves, dewatering pumps etc.) almost exclusively aim to restore a sufficiently high level of subdivision to prevent flooding from spreading through the ship. Even though assuming the flooding scenario is not catastrophic, the use of ballast tanks can be an additional and very effective tool to ensure both prevention of flooding spreading and also improve ship stability. This paper describes an optimization algorithm devised to choose the set of ballast tanks that should be filled in order to achieve an optimal response to a flooding accident.

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Optimal Design of Mud Flushing System in Ballast tank of LNG Carrier (LNG선 Ballast Tank Mud Flushing System의 최적설계)

  • Park, Sang Hyeop;Song, Yoo Seok;Kim, Young Bok
    • Transactions of the KSME C: Technology and Education
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    • v.4 no.2
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    • pp.85-92
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    • 2016
  • During ballast of a LNG carrier, the mud at the sea floor can enter the tanks together with the ballast water if the LNG terminal is located at shallow water region. In order to remove the mud deposited on the tank floor during deballasting, the mud flushing system in the ballast tanks is applied. In this study, various analyses to conform the efficiency in the mud removal are performed. In order to design the mud flushing system, the particle size of the mud is measured by particle size analyzer. Flushing performance is evaluated by numerical analysis. From the results of numerical analysis including flow field and piping system network, the optimized flushing system is determined.

HID Ballast using Soft Switching Multi Level Inverter (Soft Switching Multi Level Inverter를 이용한 HID용 Ballast)

  • Lee Jang-Sun;Kim Yoon-Ho;Kim Soo-Hong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.6
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    • pp.628-634
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    • 2004
  • The soft switching is applied to the multi-level inverter to enhance the characteristics of HID(High Intensity Discharge) Ballast in headlight of vehicle. The electrical properties are investigated. The available modeling of the ballast in steady-state is calculated using mathematical method and the result is used in analyzing the power characteristics and design of the system. Finally the designed system md modeling is confirmed by the experiment.

Fuzzy Logic-Based Blowing Controller for Underwater Flight Vehicle (수중 비행체를 위한 퍼지 논리 기반의 부상 제어기)

  • Kim, Hyun-Sik
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2008.04a
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    • pp.161-162
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    • 2008
  • 침수의 경우에, 수중 비행체(UFV : Underwater Flight Vehicle)는 발라스트 탱크들의 내부를 고압 공기로 비워 내어 부상을 수행한다. 그런데, 기존의 blow-off 방법은 가벼운 침수일지라도 부상 후에는 몸체를 수면에 드러나게 한다. 이는 불필요한 임무 실패 또는 몸체 노출의 결과를 가져온다. 따라서, 부상 제어에 의해 침수 및 부상에 의한 오버슈트 심도를 감소시킴과 동시에 몸체를 수면 근처에 유지시키는 것이 필요하다. 이 문제를 해결하기 위해서 전문가 지식 및 FBFE(Fuzzy Basis Function Expansion)를 사용하는 부상 제어 알고리즘이 제안되었다. 제안된 알고리즘의 성능 검증을 위한 시뮬레이션 결과는 제안된 알고리즘이 UFV 부상 제어 시스템에 존재하는 문제점들을 효과적으로 해결하고 있음을 보여준다.

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계절건강 지킴이 - 자외선차단제 똑똑하게 사용하기

  • Lee, Yong-Gyu
    • 건강소식
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    • v.37 no.5
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    • pp.34-35
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    • 2013
  • 계절의 여왕 오월을 맞아 들로 산으로 바깥나들이를 계획하는 사람들이 늘어나고 있다. 화사한 봄기운을 받으며 예쁜 꽃구경을 하는 것도 좋지만 문제는 자외선. 특히 요즘처럼 햇살이 점점 따가워지는 때일수록 피부를 위해 자외선차단제만큼은 절대 빼놓지 말아야 한다. 여기에서 드는 의문 하나, 외출할 때 필수품 자외선차단제 과연 얼마나 발라야할까?

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기계발골육의 특성과 이용

  • 이유방
    • KOREAN POULTRY JOURNAL
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    • v.12 no.2 s.124
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    • pp.92-97
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    • 1980
  • 가금도체로부터 살코기를 발라내는 기계발골육은 수동발골육에 비해 손색없는 단백질로서 기계발골기가 개발된 후로 육제품 원료육으로 각광을 받고 있다. 이 기계발골육은 보다 싼 값으로 산란노폐계육을 공급할 수 있도록 하는 의미에서 원료육확보에 새로운 길을 열어주고 있어 국내에서도 이의 점차적인 보급 활용이 이루어져야 할 것이다.

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Disinfection of harmful organism for ballast water using electrolytic treatment system (전해처리를 통한 밸러스트수의 유해생물 살균처리)

  • 박상호;김인수
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2004.04a
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    • pp.227-232
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    • 2004
  • Ballast water from ship harmful microorganism sterilized use of electrolytic sterilization system. The experimental methods were use of peristaltic flow pump upward on electrode pole. Due to reaction time, HRT were unlike microorganism on flow rate. In electrolysis, dioxide iridium coated titanium(Ti/IrO$_2$) and stainless steel plate were used for anode and cathode respectively. Current density controls make use of D.C Power supply on 250V 100Amper. Experimental use of current density between 0.1 and 0.5A was able to disinfect microorganism at 5 seconds by the reaction time. This study shows that the electrolyzed water has a potential for the sterilization of ballast water.

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