• Journal of Navigation and Port Research
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• v.47 no.4
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• pp.182-190
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• 2023

This study proposes a predictive model using XGBoost and SHapley Additive exPlanation (SHAP) to estimate fuel consumption in bulk carriers. Previous studies have also utilized ship engine data and weather data. However, they lacked reliability in predicted results and explanations of variables used in the fuel consumption prediction model implementation. To address these limitations, this study developed a predictive model using XGBoost and SHAP. It provides research background, scope, relevant regulations, previous studies, and research methodology. Additionally, it explains the data cleaning method for bulk carriers and verifies results of the predictive model.

• Journal of the Korea Organic Resources Recycling Association
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• v.31 no.2
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• pp.53-61
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• 2023

Most of the sewage sludge is organic waste containing a large amount of organic substances decomposable by microorganisms by biological treatment. As for existing sewage sludge treatment methods, reduction and fuel conversion are being carried out using technologies such as drying, incineration, torrefaction, carbonization. However, the disadvantage of high energy consumption has been pointed out as latent heat of 539 kcal/kg is consumed based on drying. Therefore, in this study, we intend to produce solid fuel through hydrothermal carbonization(HTC), which is a thermochemical treatment. To evaluate the value of solid fuel, the characteristics of carbonization and fuel ratio were analyzed. As a result, as the hydrothermal carbonization reaction temperature increased, the lower heating value also increased by about 500 kcal/kg due to the increase in the degree of carbonization. H/C, O/C, ratio showed a decreasing trend from 1.78, 0.46 to 1.57, 0.32. When the ratio of ash to combustible content (fixed carbon + volatile) of dry sludge was 0.25 or more, it was derived that the degree of carbonization and calorific value did not increase even when hydrothermal carbonization was performed.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.05a
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• pp.137-140
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• 1998

세계적으로 산업 각 분야에서 석유 소비가 증가하면서, 석유 의존도가 날로 심화되고 있다. 특히 우리나라는 원유 전량을 수입에 의존하고 있는 실정으로 수송분야의 경우 석유 의존도가 절대적으로 높아 이를 줄이기 위해서는 대체 연료차량 개발이 필요하다 하겠다. 또한 자동차 배출가스로 인한 대기 오염이 심화되면서 청정 연료 차량 개발 필요성 또한 시급히 해결해야 할 과제로 대두되고 있다. 이를 위해 CNG 차량에 대한 검토가 적극적으로 이루어지고 있으며 차량에 공급할 연료를 위한 충전소 시스템에 대한 개발연구가 한창 진행 중에 있다. (중략)

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.267-267
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• 2017

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1994.11a
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• pp.28-32
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• 1994

에너지이용/발전시스템의 개발은 미래의 급격한 전력수요증가 패턴과 에너지소비에 수반되는 환경문제들의 해소 그리고 에너지절약 측면에서의 이용효율 향상 및 열병합(CHP)시스템 구축 등으로 막대한 투자가 요구되고 있는 분야이다. 이 중 에너지의 효율적인 이용과 환경문제와 연계되어 주목을 받고 있는 연료전지는 연료의 cold burning을 통하여 화학에너지를 직접 전기에너지로 변환시키는 electrochemical devices로서 부수적으로 발생되는 배열을 효과적으로 이용할 수 있는 고효율, 저공해 발전시스템이라고 할 수 있다.

• Journal of Energy Engineering
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• v.17 no.4
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• pp.227-232
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• 2008

Carbon dioxide is considered a major greenhouse gas that contributes to global wanning. $CO_2$ is a major component of the exhaust in the combustion of any hydrocarbon fuel. The regulation for $CO_2$ emission from vehicles has become much more stringent in recent years. These more stringent regulations require vehicle manufacturers to develop alternative fuels that reduce exhaust emissions. This paper evaluated the correlation of $CO_2$ emission and fuel economy in the Gasoline, Diesel, and LPG vehicles according to FTP-75 and NEDC(ECE15+EUDC) driving mode. From this study, we discovered that the decrease rate of $CO_2$ emission is higher for fuels of lower carbon concentration. When the relationship between $CO_2$ emission and fuel consumption rate according to used fuels is expressed as a function, one can find out that they have a high correlation. LPG vehicles produce less $CO_2$ emission than gasoline and diesel vehicles.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.6
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• pp.639-647
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• 2014

Due to global warming and depletion of fossil fuels, technologies reducing $CO_2$ emission and increasing fuel efficiency simultaneously are required. An exhaust gas heat recovery system is a technology to satisfy both issues. This study analyses three types of heat exchanger installed on an exhaust pipe. In case of plate type heat exchanger, back pressure rapidly increased and maximum cylinder pressure reduced in high speed and maximum load, and back pressure increased over twice and specific fuel consumption also increased up to 2% which were the highest increasing rate. In case of fin tube type, the amounts of exhaust emissions and specific fuel consumption rate were less than the other two types. The effect of shell and tube was in the middle. Making a decision by only the effect on engine performance, a fin tube type is the best for exhaust heat recovery systems.

• Journal of the korean Society of Automotive Engineers
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• v.21 no.4
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• pp.20-32
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• 1999

• Korea Petroleum Association Journal
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• no.9 s.214
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• pp.80-85
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• 1999

아래 내용은 연료유지신문에 연재된 내용을 발췌ㆍ편집한 내용이다 <편집자 주>

• LP가스
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• s.102
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• pp.4-5
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• 2006

실제로 프로판은 서민연료임에도 특별소비세가 40원/kg이 부과되고 있으며, 이는 당초 특소세 부과취지에 맞지 않으므로 폐지해야 한다는 의견이 지배적이다.