• 한국생산제조학회지
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• 제22권5호
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• pp.767-773
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• 2013

A high-pressure, high-pressure drop control valve, which transforms the power transfer of a system by reducing the inlet pressure of 345bartothe outlet pressure of 112bar, is a fundamental component in an offshore plant process. With the increasingly growing market share of the maritime industry, this valve has been expected to be a high-value-added product. This study not only analyzes the relation between pressure drop and fluid velocity in a trim by using fluid analysis, but also examines the possibility of cavitation in a valve in addition to the plot for the extension of lifespan. Based on the analysis results, the design and production method of the valve are established, and accordingly, performance evaluation is carried out. It is demonstrated that the pressure drop from 345bar to 112bar is more feasible in the presence of the trim, which can induce a continuous and diminutive pressure drop in order to prevent cavitation in a high-pressure drop control valve. Furthermore, despite the fluid velocity near a seatring being found to be over 30m/s, the lifespan of the valve is determined to be adequate considering the operation condition of a prototype valve of 80%.

• International Journal of Quality Innovation
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• 제10권2호
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• pp.43-56
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• 2009

Many companies are trying to acquire innovative technologies and relevant knowledge by sending R&D work overseas. Although recent research has been focusing on the aspects that motivate MNCs to establish offshore R&D facilities, such as cost reduction and market expansion, little is known about external or circumstantial factors influencing the performance of global R&D activities. Searching for enhancers of offshore R&D facilities, we investigated the relationships between the performance of offshore R&D and the technological capabilities of a parent company, its home country, and its R&D hosting country. Both patent data of ED and the ED R&D scoreboard of 134 overseas R&D labs from 46 MNCs, dating from the period of 2003 to 2005, are used in the analysis. The same time period is applied in calculating the RTA of each country. Regression analysis results support our main hypothesis that the technological capabilities of the parent company and the hosting country positively affect the performance of overseas R&D.

• 풍력에너지저널
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• 제14권1호
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• pp.5-13
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• 2023

The commercialization has been of great importance to the clean energy research sector for investing the wind farm development, but it would be difficult to reach a social consensus on the need to expand the economic feasibility of renewable energy due to the lack of reliable and continuous information on levelized cost of Energy (LCOE). Regarding this fact, this paper presents the evaluation of LCOE, focusing on Ulsan offshore region targeting to build the first floating offshore wind farm. Energy production is estimated by the meteorology data combined with the Leanwind Project power curve of an exemplar wind turbine. This work aims to analyze the costs of the Capex depending on site-specific variables. The cost of final LCOE was estimated by using Monte-Carlo method, and it became an average range 297,090 KRW/MWh, a minimum of 251,080 KRW/MWh, and a maximum of 341,910 KRW/MWh. In the year 2021, the SMP (system marginal price) and 4.5 REC (renewable energy certificate) can be paid if 1 MWh of electricity is generated by renewable energy. Considering current SMP and REC price, the floating platform industry, which can earn around 502,000 KRW/MWh, can be finally estimated highly competitive in the Korean market.

• Journal of Ginseng Research
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• 제15권3호
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• pp.205-215
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• 1991

The current size, characteristics. and channels of distribution of the offshore export (non North American) market for ginseng products are described. The apparent size of the worlds export market for ginseng products in 1987 is 3,363 tonnes. The major export markets for ginseng are Hong Kong (1,972.4 tonnes) and Japan (540.9 tonnes). The volume of ginseng imported into Hong Kong has doubled over the past five years from 976.3 tonnes in 1983 to 1,972.4 tonnes in 1987. This increase is reflective of an expanding Chinese market. In terms of products forms, the toast majority of ginseng imported into China is in root form, while Japan imports both red and white ginseng as well as ginseng beverages and medical products. Hong Kong is the destination of over 86f; of the volume of North American ginseng exported between 1983 and 1987. North American ginseng products are distributed by ginseng brokers or importers/exporters.

• 해양환경안전학회지
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• 제25권1호
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• pp.102-110
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• 2019

우리나라의 조선해양플랜트 산업은 2011~2015년 기간에 우리나라 품목별 수출기여도에서 1~4위를 차지할 정도로 대한민국 경제성장을 견인하는 중요한 산업이다. 이 연구는 과거 건조에만 치중했던 우리나라 해양플랜트 시추설비의 산업구조에서 통합시운전의 서비스 공급이 가능한 비즈니스 모델을 검토함으로써 시추설비 시장에서 우리나라 조선소의 국가경쟁력을 향상시킬 수 있는 방안을 제안하고자 하였다. 2014년에 시도된 주작-1 폐공을 활용한 시운전 서비스 모델과 이의 한계 사항을 극복하고 사업을 활성화하기 위한 새로운 제안 비즈니스모델인 수심 150미터급 시운전 전용 모델의 경제성을 검토하였다. 경제성 평가 결과, 수심 150미터급 모델이 경제적으로 더 효과적인 것으로 나타났다. 그리고 통합시추설비의 시운전이 연간 2회에서 3,4,5회로 늘어남에 따라 NPV와 IRR 및 B/C 비율이 모두 증가하였으며, 1회당 사용료는 감소하는 것으로 나타났다. 따라서 해양시추설비의 통합시운전 사업은 우리나라에서 건조되어 인도되는 설비를 대상으로 시추 시운전을 적극적으로 유치하는 노력이 필요하다.

• 해양환경안전학회지
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• 제27권2호
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• pp.394-401
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• 2021

신재생에너지 신규설비 보급이 매년 꾸준히 증가하고 있으며, 그중 개발 확장성이 풍부하고 생산유발계수가 큰 해상풍력 시장이 급성장하고 있다. 특히 서남해 권역은 최고 수준의 해상풍력 잠재량을 보유하고 있으며, 관련 프로젝트들이 추진 중이다. 본 연구는 점토층 지반에 효과적인 해상풍력 하부구조물의 개발에 있어 EUROCODE에 의한 구조물의 설계 절차를 제시하고 구조 안전성을 고찰하여 관련 기술 분야에 이바지함을 목표로 한다. 선행연구에서는 풍력발전기 용량이 5MW급을 주요 대상으로 하였으나, 서남해 해상풍력발전기 시장의 기술 추세에 부합하는 발전 용량 8MW급을 연구 모델로 선정하였다. 이에 본 연구에서는 서남해 지질 조건에 부합하는 하부구조물을 개발하고, 구조 안전성을 유한요소법을 활용하여 검증하였다. 초기 설계안에서 일부 구간을 보강하여 구조 안전성을 확보하였다. 본 연구 결과를 기반으로 하여, 향후 다양한 형태의 하부구조물에 대한 구조 안전성 평가가 가능하며, 전문화된 구조 설계 및 평가 기준을 확립하였다.

• 한국환경과학회지
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• 제18권8호
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• pp.825-831
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• 2009

A first step review is completed on the suitability of European designed wind turbines in an East Asia climate. Six parameters are chosen for detailed analysis of proper meteorological measures from flat, hilly, forested, coastal and offshore sites in West Europe and East Asia: mean wind speed, 10 minute mean wind speed distribution, turbulence intensity, wind shear, 3 second extreme wind speed and 10 minute direction change. All six parameters are assessed with a view for contrast with the wind turbine design standard IEC61400. The diurnal and seasonal variation, average and extreme values of each parameter are calculated where appropriate. Industry standard software and analysis techniques have been employed to assess the applicability of existing wind turbine design standards and design guidelines for the East Asian market.

• Ocean Systems Engineering
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• 제12권2호
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• pp.173-223
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• 2022

In oil and gas industry, FPSO concept is the most popular hull form and ship shaped hull form dominants the FPSO market. Only a non-ship-shaped hull in operations with minor market shares is the cylindrical FPSO hull with medium to small storage capability. To add contracting options and competitions to reduce field development costs, an innovative turretless low motion hull, eco-FPSO, with 1MM bbls oil storage capacity and suitable for installing topsides modulars and equipping with regular SCRs, was first introduced in Zou (2020a). Dynamic characteristic responses of the eco-FPSO compared to the traditional SS-FPSO hull and DD-Semi platform are presented and discussed in this paper, suitability and feasibility of the proposed hull have been demonstrated and validated through extensive analyses in 10-yrp, 100-yrp and 1,000-yrp hurricanes in ultra-deepwater central GoM.

• 한국항만경제학회지
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• 제34권2호
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• pp.51-68
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• 2018

본 연구는 물류시장의 업종 간의 경영성과 차이를 비교하는 동시에 물류기업의 사업특성 차이를 분석하였다. 나아가 업종과 사업특성의 차이가 경영성과에 미치는 영향을 검정하였다. 분석 방법으로는 분산분석, 군집분석을 이용하였고, 연구의 시사점은 다음과 같다. 첫째. 일본의 물류시장은 업종 간 경영성과 차이가 나타났고, 창고서비스업이 타 업종에 비해 수익성과 안정성이 높았다. 둘째, 업종별 사업행동의 차이가 나타났고, 타 업종에 비해 해상화물운송업은 자본집약도가 높았고, 창고서비스업은 사업선도력과 신용거래도가 높았다. 마지막으로 업종과 사업특성 군집의 두 요인은 경영성과에 미치는 상호작용이 유의미하게 검정되었는데, 수익성에 있어 화물운송업과 창고서비스업의 사업특성의 작용이 달랐다. 반면, 안정성에 있어 전 업종은 공통적으로 자본집약도를 낮추고 사업선도력을 재고하는 사업특성이 유효하게 작용하였다.

• 수산해양기술연구
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• 제46권4호
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• pp.416-429
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• 2010

The market-based fisheries resources management system was reviewed and the improvement scheme was studied for seeking the sustainability of marine ecosystems and their fisheries resources. A demand-side policy is currently emerging to the management of fisheries resources by reducing over-exploitation, based on the consumer's selection. The role of consumers in the sustainable fishery was studied by comparing the social responsibility and consumer's activity between Korea and foreign countries and international NGO groups, based on the FAO guideline. The adoption of the Marine Stewardship Council (MSC)'s eco-labelling certificate was suggested by expanding the existing environment-friendly certification system in Korea. This new system will contribute to the protection of young immature fish and spawners in coastal and offshore fisheries as well as to the international trade of seafood in terms of fish products from well-managed fisheries. It is noted that the consumer's activities in the markets as regulators will contribute to the ecosystem health and sustainability.