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강영민,오진석 한국마린엔지니어링학회 2019 한국마린엔지니어링학회지 Vol.43 No.1
최근 해양플랜트의 근무환경 개선과 선박해체에 따른 환경비용 문제를 해결하기 위한 방안으로 녹색 시스템이 부각되고 있다. 더불어 차세대 선박이 스마트화(최소인원 탑승 등)됨에 따라 변화된 운영체계에 적합한 해양 녹색 시스템연구가 일부 선진국을 중심으로 연구되고 있다. 하지만 국내의 경우, 환경문제에 대체하기 위해 디젤 기관의 친환경적인개선에 대한 연구에 초점이 맞추어져 있으며, 이러한 분야는 거의 연구되지 않고 있다. 본 논문에서는 해체선박의 재활용 측면을 고려하고, 해양구조물 및 미래선박의 운용환경 등에 적용할 수 있는 녹색 시스템에 대하여 연구하였다. 녹색시스템은 자동화 식물 재배 시스템으로 식물 성장에 필수적인 수분, 온도, 광량을 제어하고 이상적인 상태를 유지하는시스템이다. 녹색 시스템의 적용을 위해 제어 시스템을 개발하였으며, 시험을 위한 제품을 제작하였다. 시제품 실험을통해 재배 효용성이 높은 상추를 기준으로 수분, 온도, 광량의 운용 상태를 분석하였으며, 설계치 내에서 이상 없이 동작하는 것을 확인하였다. In recent years, a green system has emerged as a means of improving operating environments of offshore plants and to reduce the carbon footprint of dismantled ships. In addition, as next-generation vessels are becoming smart (minimum number of people on board), marine green systems are being studied in some developed countries to modify the operating environment. However, in Korea, the focus so far has been on eco-friendly diesel engines to address environmental problems, and other fields have not been adequately studied. Considering recycling costs of a dismantled ship, we studied a green system that can be applied to marine structures and future ship's operating environments. A green system is an automated plant cultivation system. It controls moisture, temperature, and light intensity necessary for plant growth, and maintains ideal growth conditions. We developed such a control system and produced a prototype. Through experiments with the prototype, we analyzed the moisture, temperature, and light intensity. From the high yield of lettuce we confirmed that the green system operates without any abnormalities.
강영민,김상섭,백성기 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.5
We studied the crystallization behavior of amorphous PbTiO3 thin film grown at 30$0^{\circ}C$ by RF magnetron sputtering on Pt substrate. Crystallization to full perovskite phase was observed after annealing at 475$^{\circ}C$, for 9min, without PbO volatilization. The higher the annealing temperature, the shorter the time required for crystallization. The isothermal kinetic study at 475$^{\circ}C$ showed that the Avrami constant was approximately 4, which implies that the crystallization can be characterized by isotropic 3-dimensional growth with a constant nucleation rate. The TEM study revealed that the crystallized thin film was composed of very fine (20~100nm) grains oriented randomly without any evidence of 90$^{\circ}$domain boundaries.
Design of a hybrid power management system and cold start simulation in a fuel cell ship with PLECS
강영민,오진석 한국마린엔지니어링학회 2016 한국마린엔지니어링학회지 Vol.40 No.5
Currently, many studies on green ships are under way. Fuel cell (FC) ships are of interest as future low-emission, fuel-efficient vessels. In this paper, a hybrid power management system for an FC ship was designed. The system consists of an FC, a battery, a unidirectional DC/DC converter, a bidirectional DC/DC converter, a filter, an inverter, and a propulsion component. To design the system, we analyze electric sources and converters, and create PLECS models of hybrid power management system. Then, we check the cold start sequence and perform a simulation to understand the characteristics of the hybrid power management system in an FC ship.