Yunja Yoo

This study examines the economic and environmental feasibility of liquefied petroleum gas (LPG) as an alternative marine fuel in South Korea using cost-benefit analysis grounded in the Benefit Transfer Method. Social environmental costs of ship emissions (CO₂, NOx, SOx, PM) are monetized using European NEEDS damage costs adjusted via purchasing power parity and consumer price index corrections. Two datasets are analyzed: the full registered fleet (66,965 vessels, Dataset A) and a medium-size vessel fleet (1,029 vessels ≥300 GT, Dataset B). Results show LPG conversion yields reductions of 97.2% for SOx, 88.8–98.9% for PM, 27.7% for NOx, and 14.1% for CO₂. Net present value analysis over 25 years indicates total benefits of KRW 6.05–7.61 trillion (USD 4.5–5.7 billion), with positive NPV across all eight scenarios. Sensitivity analysis confirms robustness under ±40% fuel price variation. These findings support LPG as a practical transitional fuel for reducing maritime air pollution.

This study aims to identify the key success factors for the adoption of a cloud computing system in vessel traffic service (VTS) systems and evaluate the relative importance of each factor. Through a literature review and expert Delphi surveys, 12 success factors were derived across the dimensions of technology, organization, environment, and institution. The results of the analytic hierarchy process (AHP) analysis revealed that stability in the technological dimension was the most important factor. This study provides useful implications for future decision-making in VTS cloud adoption by systematically identifying the key success factors and presenting their priorities through the application of the TOE-I framework to VTS cloud computing.

To reduce air pollutants, the International Maritime Organisation and port authorities use ship emissions regulations, such as MARPOL Annex VI and green port policies. To measure the effectiveness of these air emissions regulatory policies, accurate calculations of pollutant emissions and estimations of the social environmental costs of emissions are important. However, Busan Port still suffers from a lack of research on continuous monitoring and easy access to data-based emission calculation methods and estimation of the social environmental costs. Therefore, the purpose of this study is to present quantitative emission calculations based on an open source and social environmental cost estimation method. To this end, the discharge of pollutants (NOx, SO₂, CO₂, VOC, PM2.5, and PM10) from ships in Busan Port was calculated using Port-MIS open data from 2015–2019. Subsequently, when the original study on estimating the social and environmental impact of air pollution from ships in Busan Port was difficult, the international benefit transfer method (an economic valuation method) was applied to estimate the social environmental costs. Our results can provide a basis for verifying the effectiveness of Busan Port’s air quality improvement policy in the future.