• 한국해양공학회지
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• 제20권1호
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• pp.26-31
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• 2006

Experimental research was undertaken to develop a domestic spray nozzle used on equipment for desalination. First, we made a test set-up in order to confirm nozzle efficiency of spray and distribution under different pressure conditions. Then, we found a maximum spray condition after verifying reliability of this facility. An optimum arrangement of the nozzle, based on the test result, was made using CATIA V5 and EXCEL.

• International Journal of Naval Architecture and Ocean Engineering
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• 제10권4호
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• pp.458-467
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• 2018

Efforts have been made in this paper to develop the measuring device for the insulation performance of full scale NO96 LNG CCS. The facility was designed to maintain environmental conditions which are similar to operation conditions of full scale LNG CCS. In the facility, the heat sink boundary was kept cryogenic temperature by cold chamber which contains liquefied nitrogen and heat source boundary was made by external case heated by natural convection. Heat Flow Meter method (HFM) was applied to this facility, hence Heat Flux Sensors (HFS) were attached to specimen. The equivalent thermal conductivity of full scale NO96 unit box was targeted to measure and PUF of same size was used for the calibration test. Additionally, the finite element analysis was carried out to check the performance of the developed test facility and experimental results were also compared with those predicted by the numerical method.

• Journal of Advanced Marine Engineering and Technology
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• 제34권6호
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• pp.906-913
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• 2010

최근 해양 시설물용 복합 발전 시스템 개발에 관한 많은 연구가 수행되고 있다. 일반적으로 해양시설물에 사용되는 독립형 전력 공급 시스템은 날씨에 상당히 많은 영향을 받게 된다. 이러한 전력 공급시스템의 효율성을 높이기 위하여 다양한 스위칭 알고리즘을 이용한 충전 기법이 연구되고 있다. 본 논문에서는 다중 레벨 방식을 적용한 전력 시스템의 충전 방식을 제안하고 실험을 통하여 결과를 제시하였다. 다중 레벨 방식의 충전기법을 시뮬레이션한 장치의 실험 결과와 기존에 사용 중인 전력 공급 시스템의 실험 결과를 비교하여 나타내었다. 그 결과, 다중 레벨 방식의 충전기법을 이용하는 경우에 기상 조건에 따라 충전 전력은 5~11%, 충전 가능 시간은 7~47% 정도 향상되었음을 확인하였다.

• 한국항해항만학회지
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• 제44권1호
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• pp.20-31
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• 2020

본 연구는 해양치유시설의 계획기준을 마련하는 연구로서 해양치유시설의 주요 계획항목인 입지선정, 환경계획, 공간계획을 대상으로 한다. 이를 위해 먼저 해양치유시설 특성을 살펴보고 해양치유시설계획의 기초가 되는 치유자원과 치유요법을 조사하며 해양치유시설 관련 해외기준을 분석한다. 이상의 결과를 바탕으로 해양치유시설의 입지선정, 환경계획, 공간계획을 위한 기준을 제시한다. 연구결과 입지선정기준으로는 해안선에서 1km 이내 거리에 위치하고 오염물질 배출시설이 없으며 더위체감지수와 체감온도가 연중 80%이상 '주의' 이하로 유지되는 곳으로 한다. 환경계획기준에서 수질은 국내기준 혹은 ISO 17680 기준 가운데 가장 엄격한 기준으로 하고 공기의 질은 「환경정책기본법」의 대기환경기준치의 60% 수준으로 하며 공기 중 SO₂, NO₂, O₃, PM10 농도는 연간기준초과횟수를 EU기준에 맞도록 하고 소음은 주간 50dB 이하, 야간 40dB 이하로 한다. 공간계획기준은 공간의 특성에 따라 「건축법」의 기준, 건축계획실무기준, 국제기준을 따르도록 한다.

• 한국해양공학회지
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• 제35권6호
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• pp.446-456
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• 2021

To build an environment facility of a large-scale ocean basin, various detailed reviews are required, but it is difficult to find data that introduces the related research or construction processes on the environment facility. The current generator facility for offshore structure safety evaluation tests should be implemented by rotating the water of the basin. However, when the water in the large basin rotates, relatively large flow irregularities may occur and the uniformity may not be adequate. In this paper, design and review were conducted to satisfy the performance goals of the DOEB through computational numerical analysis on the shape of the waterway and the flow straightening devices to form the current in the large tank. Based on this, the head loss, which decreases the flow rate when the large tank water rotates through the water channel, was estimated and used as the pump capacity (impeller) design data. The impeller of the DOEB current generator was designed through computational numerical analysis (CFD) based on the lift surface theory from the axial-type impeller shape for satisfying the head loss of the waterway and maximum current velocity. In order to confirm the performance of the designed impeller system, the flow rate and flow velocity performance were checked through factory test operation. And, after installing DOEB, the current flow rate and velocity performance were reviewed compare with the original design target values. Finally, by measuring the current velocity of the test area in DOEB formed through the current generator, the spatial current distribution characteristics in the test area were analyzed. Through the analysis of the current distribution characteristics of the DOEB test area, it was confirmed that the realization of the maximum current velocity and the average flow velocity distribution, the main performance goals in the waterway design process, were satisfied.

• 한국항해항만학회지
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• 제39권6호
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• pp.529-538
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• 2015

본 연구에서는 바다낚시인의 증가 따른 낚시시설의 부족을 해결하고 바다낚시를 해양레저로 정착시키며 어촌의 경제 활성화를 돕기 위한 목적으로 조성된 바다낚시공원의 시설측면의 문제점을 실증적으로 파악하고, 이 결과를 바탕으로 바다낚시공원의 시설개선사항 및 새로운 바다낚시공원의 계획을 위한 시설계획방향을 제시하였다. 시설측면의 문제점 분석을 위하여 현재 운영 중인 9군데 바다낚시공원과 2군대 바다목장을 대상으로 시설운영 현황조사 및 시설관리인 인터뷰조사를 실시하고 바다낚시공원, 어촌체험마을 등 25군데 바다낚시시설에서 낚시인을 대상으로 시설요구사항에 대해 설문조사를 실시하였다. 조사결과 가족단위 낚시인구의 증가에 따른 안전시설 및 화장실, 휴게시설 등의 편의시설 확충에 대한 요구가 많았으며, 초보자를 위한 가두리낚시터 등의 교육, 체험시설의 필요성과 캠핑장, 해변공원, 산책로 등의 낚시활동 외 여가활동을 위한 시설 도입에 대한 요구가 높게 조사 되었다. 따라서 바다낚시공원은 낚시활동을 중심으로 한 복합레저공간으로 계획하여야 하며, 낚시공원 내 활동요구사항에 적합한 시설구성 및 시설계획이 필요하다.

• Journal of Advanced Marine Engineering and Technology
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• 제38권4호
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• pp.456-462
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• 2014

본 논문에서는 시설물의 효율적인 유지보수를 지원하기 위하여 시설물을 구성하는 부품의 고장 영향 및 교체 주기 알람 기능을 제공하는 시설물 관리 시스템의 개발에 관한 내용을 다룬다. 이를 위해 시설물의 BOM을 활용하여 시설물을 구성하는 각 부품에 가중치를 부여하여 부품별 중요도를 계산하고 부품 간의 관계를 구조화하였다. 또한 BOM에 FMECA 기법을 도입하여 시설물을 구성하는 각 부품별 고장 원인 및 영향 등을 도출하였으며, 시설물에서의 위험 우선순위를 구하기 위한 심각도, 발생도, 검출도에 관한 기준을 정의하였다. 이러한 내용을 반영하여 웹 기반 시설물 관리 시스템을 개발하였으며 이를 통해 제안하는 방법의 유용성을 실험하였다. 개발한 시스템은 향후 시설물의 관리뿐만 아니라 선박 및 해양플랜트의 유지보수 등 여러 분야에 적용될 수 있을 것으로 기대된다.

• 한국해양공학회지
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• 제21권2호
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• pp.60-66
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• 2007

The first Korean cold room facility for ice mechanics experiments was assembled in 2004. Since then, the $4m{\times}6m$ cold room facility has been used, extensively under various environmental and loading conditions. After reviewing published references on cold room testing methods and also by trial and error, the standard procedures for testing and preparing laboratory ice material were established for the measurement of basic ice properties. In this paper, laboratory experimental techniques with the cold room facility and standard procedures established for ice material properties are introduced. Test specimens include laboratory-grown fresh water ice and frozen soils. Tests are carried out for unconfined compressive strength. Preparation and dimension of the specimen are the most important issues arising in cold room tests. The details of specimen preparation, testing procedure and strength test results are also discussed.

• 한국해양공학회지
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• 제27권6호
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• pp.7-15
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• 2013

Eco-friendly and sustainable seaweed biomass energy have been under the spotlight as the future of renewable energy. However, seaweed culture is primarily conducted inshore, with the research on offshore culture still in an early stage. For massive biomass production, a systematic engineering approach is required to devise offshore seaweed culture facilities rather than the conventional empirical ones. To establish the fundamental behavior of seaweed culture facilities, the dynamic characteristics of a seaweed culture facility were analyzed in the study. For this purpose, numerical analyses of the seaweed culture facility (a frame type) were carried out by using the hydrodynamic simulation program ANSYS-AQWA. For the analysis, environmental loads were considered using the wave spectra and co-linear current; mooring variables were selected as parameters; and time domain analyses were carried out to acquire the time series responses and eventually the dynamic characteristics. Finally, the mooring performance was evaluated. It was found that the motion could be controlled by adjusting the buoyancy and mooring slope.

• 대한조선학회논문집
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• 제59권5호
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• pp.280-287
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• 2022

An open rack vaporizer is a facility that vaporizes liquefied natural gas using sea water. When a vaporization efficiency of the open rack vaporizer decreases, liquefied natural gas can leak, which can cause great damage to the facility. Operators have to monitor the operation state of the facility in real-time to prevent the accident. However, operators have visited the site and have checked the state by looking at the value of sensors installed in the open rack vaporizer through indicators. For the safe operation of the open rack vaporizer, a monitoring system is needed to monitor the operation state of the open rack vaporizer in real-time without the need for operators to visit the site. In this paper, we developed a long term evolution based monitoring system to monitor the operation state of the open rack vaporizer. The developed system can monitor the real-time operation state of the open rack vaporizer at a control center far from the facility. For the system development, data transmission infrastructure using long term evolution was built. Afterwards a software was developed to monitor the operation state of the open rack vaporizer in real-time using the transmitted data. Finally, performance evaluation was conducted to confirm that the developed system operated successfully without data transmission delay or data missing.