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IDI 압축 착화기관에서 동물성 유지를 이용한 바이오 디젤의 연소 특성 연구
김재한(Jaehan Kim),김진홍(Jinhong Kim),김기석(Kiseok Kim),오영택(Youngtaig Oh) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Due to environmental pollution and depletion of fossil fuels, research of eco-friendly energy source that can replace the fossil fuels being actively performed. Although biodiesel by vegetable oil has been produced, the interest in the animal fats is increasing due to the food shortages and rise of grain price. In this study, we have performed for exhaust emission and combustion characteristics of indirect injection (IDI) compression ignition engine by using lard biodiesel 5-30% mixture of diesel at various engine speeds and operational conditions. We have obtained that the results of engine performance operated by lard biodiesel at various engine load and speed was slightly decreased, but brake specific energy consumption (BSEC) at using lard biodiesel below 15% was better than diesel fuels. When the mixing ratio of biodiesel increased, PM was a significantly reduced. However, NOx was a slight increase. Therefore, that the biodiesel of animal fats is available for alternative fuel of diesel engine was confirmed.
Kim, Seoni,Kim, Jiye,Kim, Seonghwan,Lee, Jaehan,Yoon, Jeyong The Royal Society of Chemistry 2018 Environmental science Vol.4 No.2
<P>Lithium has become one of the most important elements due to the rapid development of mobile devices and electronics lately. There has been a steep increase in the global demand for lithium, and developing an economic supply of lithium is thereby important for battery industries. This study presents a new method for recovering lithium in wastewater from battery recycling plants, in which a considerable amount of lithium (∼1900 mg L<SUP>−1</SUP>) is discarded. There was a significant amount of organic pollutants present in the wastewater (∼300 mg L<SUP>−1</SUP> of dissolved organic carbon), and so to resolve this, we proposed an electrochemical system containing a lithium-recovering electrode (lithium manganese oxide, LMO) and an oxidant-generating electrode (boron-doped diamond, BDD) to simultaneously recover lithium and decompose organic pollutants. Repeated operation of the electrochemical system demonstrated highly efficient and reliable lithium extraction and organic material removal from wastewater. After the lithium recovery system operation, a lithium-rich solution (98.6 mol% lithium among cations) was obtained, and the organic pollutants in the wastewater decreased by 65%. Furthermore, the electrochemical behavior of LMO and BDD was investigated under various operating conditions to provide useful insights into the industrial applications of our LMO/BDD system.</P>
JaeHan Joo,Jae-Gwang Lee,SangWoo Kim,JaeHan Lee,June-Hee Lee,Kyung-Jae Lee 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
Background: We aimed to find the relationship between sleep duration and impaired fasting glucose according to working type in non-regular workers using the 2016 and 2017 Korean National Health And Nutrition Examination (KNHANE, 7th revision). Method: In the 1st and 2nd year (2016, 2017) of the 7th KNHANE, 16,277 people participated. Minors were excluded because this study was intended for individuals aged 19 years and older. As this study was based on wage workers, unemployment, self-employed workers, employers, unpaid family workers, and those who have insufficient answers such as unknown or no response were excluded. Regular workers were excluded because this study was intended for non-regular workers. Finally, a total of 2,168 people were included in the survey, except those who had been diagnosed with diabetes, had a fasting blood glucose level of 126 mg/dL or higher, or taking hypoglycemic agents or receiving insulin injections. To find the relationship between sleep duration and impaired fasting glucose according to work type in non-regular workers, multiple logistic regression analysis was performed by adjusting the general and occupational characteristics after stratification according to work type. All statistical analyses were performed using the SPSS software (version 26.0; SPSS Inc., Chicago, IL, USA). Results: In the case of insufficient sleep duration in irregular female workers, the odds ratio (OR) of impaired fasting glucose was statistically insignificant, but in the case of insufficient sleep duration in irregular male workers who have shift work, the odds ratio (OR) of impaired fasting glucose was significantly higher than that of sufficient sleep duration (Model 1, OR: 3.05, 95% confidence interval [CI]: 1.18–7.90; Model 2, OR: 2.81, 95% CI: 1.08–7.29). Conclusions: Our findings demonstrate that insufficient sleep duration was associated with an increase in fasting blood glucose levels in non-regular male workers working shifts. This means that non-regular workers are in desperate need for adequate sleep and health care. We hope that our study will help improve the health of non-regular workers and more systematic and prospective follow-up studies will be conducted to further improve the health of non-regular workers.